US3502535A - Apparatus for tensioning reinforcing strands for belts and the like - Google Patents

Apparatus for tensioning reinforcing strands for belts and the like Download PDF

Info

Publication number
US3502535A
US3502535A US634749A US3502535DA US3502535A US 3502535 A US3502535 A US 3502535A US 634749 A US634749 A US 634749A US 3502535D A US3502535D A US 3502535DA US 3502535 A US3502535 A US 3502535A
Authority
US
United States
Prior art keywords
tensioning
wires
strands
cylinder
array
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US634749A
Inventor
Hendrikus Johannes Bongers
Winfried Moitzfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siempelkamp Giesserei KG
G Siempelkamp GmbH and Co KG
Original Assignee
Siempelkamp Giesserei KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siempelkamp Giesserei KG filed Critical Siempelkamp Giesserei KG
Application granted granted Critical
Publication of US3502535A publication Critical patent/US3502535A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12Mounting of reinforcing inserts; Prestressing
    • E04G21/121Construction of stressing jacks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21FWORKING OR PROCESSING OF METAL WIRE
    • B21F9/00Straining wire
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/04Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
    • B28B23/043Wire anchoring or tensioning means for the reinforcements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00Producing belts or bands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00Producing belts or bands
    • B29D29/06Conveyor belts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30Belts or like endless load-carriers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/10Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/36Floating elements compensating for irregularities in supply or take-up of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/06Articles and bulk

Definitions

  • FIG.2 APPARATUS FOR TENSIONING REINFORCING STRANDS FOR BELTS AND THE LIKE Filed April 28, 1967 4 Sheets-Sheet 2 FIG.2
  • the present invention relates to apparatus for the production of conveyor belts, bands and other relatively elongated bodies of elastomeric material having longitudinally extending reinforcing strands and, more particularly, to a strand-tensioning device for such installations.
  • the strands may pass through a wire-straightening means to form a generally flat array of mutually parallel, transversely spaced, steel reinforcing wire; a pair of supply devices for applying respective core strips to the array of reinforcing wires; means for applying outer rubber strips; an equalizing precompression press for intermittently compacting the elastomeric bands about the wires; and means for vulcanizing the flexible layers of the core and the outer layers to the reinforcing strands.
  • the system operates substantially continuously, i.e. the band passes in steps through the vulcanizing press, while the core layers and outer strips are applied more or less continuously via a traveling carriage.
  • Still another object of this invention is to provide a relatively simple and economical device for selectively and individually tensioning a multiplicity of relatively closely spaced reinforcing strands of a conveyor belt-production plant and for collectively prestressing same.
  • the means for individually tensioning the reinforcing wires comprises a cylinder assembly having a plurailty of hydraulic cylinders each associated with a respective reinforcing strand and having a respective piston engageable with this strand via a tensioning pulley or the like, the cylinder assembly being provided with means for shifting it in the direction of movement of the individual tensile pistons.
  • the cylinder assembly comprises a cylinder block running athwart a multiplicity of the transversely spaced mutually parallel reinforcing strands and is provided with a multiplicity of cylinder bores extending perpendicularly to the plane of the array of strands, each bore having an axial plane in which the corresponding strand substantially lies.
  • the bores are disposed in staggered relationship on opposite sides of a median plane perpendicular to the array and, advantageously forming an axial plane of the mechanism for raising and lowering the cylinder block.
  • This mechanism can comprise a further hydraulic cylinder whose piston is surmounted by the block and vertically shifts the latter with respect to a framework above the array in which the idler pulleys are journaled.
  • the tensioning elements associated with each strand can comprise a pair of idler pulleys dependent from the frame and longitudinally spaced in the direction of movement of these strands and a vertically shiftable pulley disposed between the depending idler pulleys and carried by the respective piston which slidably is received in the cylinder bore directly below the strand.
  • the pretensioning or main cylinder will, of course, be dimensioned to carry the cylinder block and to apply a preliminary stress to all of the strands associated therewith via the individual tensioning pistons.
  • the cylinder bores of the common block are connected in parallel to a common hydraulic line through which hydraulic fluid is supplied to the tensioning pistons.
  • the steel wires are individually threaded through a straightening device, if necessary, from the supply wheels and then are passed through the input clamp, around the idler-tensioning pulleys of the individual tensioning assembly, drawn through the output clamp and then passed through the layer-applying arrangement (see application Ser. No. 611,626) and introduced with the layers into the vulcanizing press.
  • the array is then locked into position on the output side of the tensioning system via the output clamp and/or the vulcanizing press, while the input clamp is closed onto the array to apply a light pressure to the steel wires without, however, immobilizing them completely.
  • the wires can be drawn through the input clamp during the tensioning action against a frictional resistance of the platens.
  • the cylinder block is raised and the various elongatabilities of the reinforcing strands are compensated by slip through the initial clamp which is then closed tightly.
  • the tensioning is now effected by further advance of the cylinder block until the individual wires are pre-tensioned to a degree below the normal level of tension for operation of the system.
  • this pre-tensioning period there is at least a partial equalization of the tensile stress upon all of the wires.
  • a further equalization of the tensile stress is effected by hydraulically charging the individual cylinders in parallel so that the pressure applied by the respective pistons to each of the strands is identical throughout the array.
  • each of the cylinder bores is provided with a respective extension whose diameter is somewhat less than the diameter of the respective piston head and which is coaxial therewith and machined into the cylinder block, these extensions communicating with lateral ducts opening into the manifold passage.
  • the pistons each are provided with blade-like extensions fixed to the piston rods and carrying the tensioning pulleys which pass between depending blade-like members upon which the idlers are journaled.
  • the idler blades can be carried by a rack disposed directly above the cylinder block and having idler pulleys which are substantially tangent to the plane of the array.
  • the device thus occupies relatively little space and can be operated with a minimum of technological difficulty.
  • FIG. 1 is an elevational view of a portion of an apparatus for making conveyor belts and incorporating a tensioning device in accordance with the present invention
  • FIG. 2 is a plan view of the tensioning device, greatly enlarged and partly diagrammatic, showing the lay-out of the idler pulleys, the tensioning pulleys and the cylinder bores;
  • FIG. 3 is a cross-sectional view taken along the line IIIIII of FIG. 2;
  • FIG. 4 is a cross-sectional view taken along the line IVIV of FIG 3;
  • FIG. 5 is an elevational view of a modification of the tensioning device.
  • FIG. 1 we show the tensioning system of an apparatus for the production of conveyor belts, the balance of which may be constituted as described and illustrated in the copending application Ser. No. 611,626.
  • the apparatus basically comprises a supply system S for delivering a multiplicity of strands 1, e.g. steel wires, from supply reels 20 to the vulcanizing press and the means for applying the rubber layers to the core wires 1 and represented at A.
  • the reels 20 are provided with axles 21 rotatably received in notches 22 between a pair of support plates 23 mounted upon a pedestal 24 of the supply station S.
  • Each wire 1 passes around a guide roll 25 so that, upon emergence from the supply device 3, the longitudinally extending, transversely spaced parallel wires 1 lie in a horizontal plane represented at P.
  • the Wires individually pass through straightening eyes 26 of a straightening arrangement R which is constituted as generally described in the aforementioned copending application. Individual eyes 26 are mounted upon the pedestal 27 and form a comb-like guide for the parallel strands.
  • the planar array of strands passes between the platens 2a, 2b of a clamping device 2 at the input side of the tensioning means represented at 4.
  • the platen 2b rests upon the pedestal 2c of the clamp while the platen 2a is vertically movable (arrow 2d) and is guided by a frame 2e upon which a piston arrangement 2] is disposed.
  • the piston 21 of the latter carries the platen 2a and is designed to lower it into frictional engagement with the wires 1 or complete disengagement of the latter and into the tight gripping of these wires in the three positions of the clamp.
  • the clamp is illustrated in greater detail in the aforementioned application.
  • the tensioning device 4 comprises, as can best be seen from FIGS. 1 and 3, a traverse 7 which extends athwart the array of wires 1 above the plane P thereof and is provided with depending arms 7a and 7b in staggered pairs (see FIG. 2), each pair of arms 7a or 71) carrying a respective pair of stationary idler rollers 6.
  • the rollers 6 of each pair of arms and a respective roller 14 of the tensioning mechanism for each wire is coplanar therewith, i.e. lies in a vertical plane P,, of the respective wire.
  • the traverse 7 is fixed to a support structure represented diagrammatically at 70, and co-operates with the vertically shiftable cylinder block 10 whose direction of movement is represented by the arrow 11.
  • the cylinder block 10 is supported on a system 12a of a relatively large-diameter pre-tensioning hydraulic cylinder 12 in a well 11a of the plant.
  • the cylinder block 10 is integrally formed (FIG. 3) with a multiplicity of vertical bores 8 which can be provided with cylinder linings for sealing engagement with the head 9 of the respective piston 9a.
  • the cylinder bores 8 associated with the adjacent strands 1 are staggered in two vertical planes P and P offset in the direction of displacement of the wires 1 (arrow 11b).
  • each of the pistons 9a and the respective bores 8 is disposed directly beneath the respective strand 1 (FIG.
  • Each of the cylinder bores 8 is formed with a coaxial extension 8a of a diameter smaller than that of the piston head 9 and communicating with a respective bore a lying in the respective plane P and communicating with a manifold bore 15 running longitudinally through the block 10 between the rows of cylinder bores 8.
  • the cylinder bores 8 are thus fed with hydraulic fluid in parallel, the terminus 15b of the channel 15 being supplied with hydraulic fluid through a conventional control line.
  • each of the pistons 911 can be shifted by the hydraulic fluid delivered to the manifold channel 15 in the direction of arrows 9b while the cylinder block 10 is movable independently of this individual piston movement via the piston 12a and the cylinder 12 which, in turn, is controlled by a valve system not shown.
  • the pistons 9a each carries a blade-like extension 13, laterally offset from the respective plane P (see FIG. 4), the blades 13 having .pins 14:: upon which the respective pulleys 14 are journaled.
  • the blade-like depending arms 7a: of the traverse 7 carry pins 6a upon which the pulleys 6 are mounted.
  • branch channels 15a connect the bores 8 in parallel to the manifold channel 15 so that the same hydraulic pressure is maintained below the pistons 9, 9a, in each bore 8 and, in spite of the fact that the strokes of these pistons may vary with the degree of elongation of the reinforcing wires 1 and the need to take up any slack therein, all of these Wires will be individually tensioned to an identical prestress upon hydraulic energization of the manifold channel 15.
  • the belt is fixedly held by the clamp 3 downstream of the tensioning device 4 through which the wires 1 from the supply reels have been threaded.
  • the clamp 2 is closed to engage the wires 1 relatively lightly, i.e. to permit sliding movement of the wires 1 against a frictional retarding force.
  • the cylinder block 10 is then raised by the hydraulic-cylinder arrangement 12, 12a to form loops 5 (FIG. 3) in the wires 1 passing around each pair of fixed idler pulleys 6 and a respective tensioning pulley 14.
  • the pre-tensioning force thus applied to the wires compensates or equalizes the possibly non uniform longitudinal yieldability of the steel reinforcing wires 1.
  • clamp 2 is tightened to fix the array of Wires upstream of the tensioning device 4 and hydraulic fluid is supplied to apply upward hydraulic force of equal magnitude to all of the pistons 9, 9a and thereby subject the individual Wires 1 to a predetermined level or tension.
  • the vulcanizing press can then be closed to bond the outer layers to the core layers and the core layers to the reinforcing wires 1 of the stretch of band within the vulcanizing press and which has previously passed through the layer-applying means.
  • the pistons 9, 9a are, prior to the application of hydraulic fluid pressure to the block 10 via the channel 15, in predetermined starting positions which may be intermediate positions with respect to their total stroke or end limiting positions in which the pistons are fully received in the respective cylinder bores 8, depending upon the requirements of the system.
  • clamp 3 Upon vulcanization of the stretch of band within the press, clamp 3 is opened, the press separated, clamp 2 is opened and the block 10 lowered to release the wires 1 and permit a further length thereof to be drawn to the line. As this length of wires is advanced, it is coated with the layers as described above and the sequence of steps for tensioning the wires is repeated.
  • this system is highly advantageous not only for steel reinforcing wires but for strands of material which are more or less extensive by comparison with steel.
  • the system may use monofilamentary or polyfilamentary synthetic resin strands, twisted or braided fiber cord or the like.
  • FIG. 5 we show a modified tensioning device 40 which may be substituted for the system illustrated in FIGS. 1-4 and which comprises, in place of the cylinder block 10, a beam 41 which carries a multiplicity of vertically shiftable and independently guided blade members 42 carrying tensioning pulleys 43 adapted to co-operate with the pulleys 6 of the traverse 4 illustrated in FIG. 3.
  • the guide means for the bars 42 is represented by an elongated slot 44 in the beam 41 for each of the bars and a guide pin 45 thereof, slidably received in the respective slot 44.
  • the bars alternately disposed along the beam 41 transversely of the wires 1 are staggered in the direction of the major dimension of the wires as illustrated at the left-hand sides of FIG. 2.
  • a flexible cable 46 is anchored to a stationary support 47 via a relatively stiff coil spring 48 and tension is applied to the flexible cable 46 via a cylinder 49 and its piston rod 50.
  • the cable 46 undershoots respective pulleys '51 journaled on the bars 42 below the tensioning pulleys 43 and overshoots stationary idler roller '52 carried by uprights 53 upon the beam 41.
  • the latter is, in turn, provided with a main hydraulic cylinder 54 Whose piston 54a raises and lowers the beam.
  • the device in FIG. 5 operates generally in the manner previously described with the initial tensioning of the Wires 1 being effected by a raising of the beam 41 by the hydraulic cylinder 54, 54a.
  • tension is applied to the cable 46 by the hydraulic cylinder 49, 50 in the direction of arrow 55 and a uniform tension is applied via the loops 5 and the tension wheels 43 to the individual wires with the wheels 43 and the bars 42 assuming relative vertical positions in dependency upon the degree of stretch of the individual wires as may be necessary to reach the predetermined tension.
  • an apparatus for the production of reinforced elongated bodies wherein an array of mutually parallel longitudinally extending tensioned reinforcing strands are bonded to the body the improvement which comprises a device for individually tensioning said strands, said device including a support extending transversely of said array and provided with a plurality of individually movable tensioning members respectively aligned and engageable with said strands; first means for shifting said support relative to said array for preliminarily tensioning said strands; and second means for shifting said members relative to said support for final tensioning of the respective strands.
  • said device further comprises a traverse extending athwart said array on a side thereof opposite that along which said support extends, said traverse being provided with respective idler pulleys forming tensioning loops with the respective members of said support.
  • tensioning members are upright blades carrying tensioning pulleys lying substantially in common vertical planes with the respective idler pulleys and strand.
  • said support is a cylinder block and said second means includes a multiplicity of cylinder bores formed in said block in line with the respective strands, said members including pistons respectively slidable in said bores and having tensioning pulleys engageable with the respective strands.
  • each of said pistons is provided with a blade-shaped extension carrying the respective tensioning pulley.
  • said second means includes further piston-and-cylinder arrangements carried by said support and individual to said strand, said support being provided with channels for communicating a fluid medium to said further pistonand-cylinder arrangements.
  • said second means is a tensioning cable common to said tensioning members for transmitting a tension force thereto in parallel.

Description

March 24; 1970 H. J. BONGERS ETA!- 3,502,535
APPARATUS FOR TENSIQNING RBINPORCING STRANDS FOR BELTS mm mm mm Filed April 28, 1967 4 Shaets -Sheet 1 Ila F' I6. I
A TTORNE).
March 24, 1970 H.J. BONGERS ETAL 3,502,535
APPARATUS FOR TENSIONING REINFORCING STRANDS FOR BELTS AND THE LIKE Filed April 28, 1967 4 Sheets-Sheet 2 FIG.2
H J 81 ZVENTORS NGERS W/NFRIED WITZFELD A rraawsy' March 24, 1970 H. J. BONGERS E AL Y 3,502,535
APPARATUS FOR TENSIONING REINFORCING STRANDS FOR BELTS AND THE LIKE Filed April 28, 1967 4 Sheets-Sheet 3 [2 I I I I I INVENTORS H J. BONGERS WINFRIEO MOITZFELD Y FIG. 3 fKar A TTORNEY March 24, 1970 Filed April 28. 1967 H. J. BONGERS ET AL APPARATUS FOR TENSIONING REINFORCING STRANDS FOR BELTS AND THE LIKE 4 Sheets-Sheet 4 FIGS 1N VENTORS H. J. BONGEQ BY W/NFRIED MOITZiELO United States Patent 3,502,535 APPARATUS FOR TENSIONING REINFORCING STRANDS FOR BELTS AND THE LIKE Hendrikus Johannes Bongers and Winfried Moitzfeld, Krefeld, Germany, assiguors to G. Siempelkamp 82 C0., Krefeld, Germany, a corporation of Germany Filed Apr. 28, 1967, Ser. No. 634,749 Claims priority, application Germany, Apr. 30, 1966,
S 103,571 Int. Cl. 33% /04, 32/10; B65h 77/00 US. Cl. 156-494 10 Claims ABSTRACT OF THE DISCLOSURE Apparatus for the production of reinforced elongated flexible belts wherein an array of mutually parallel longitudinally extending tensioned reinforced strands are bonded respective layers, wherein the wire-tensioning device includes a support (eg a cylinder block) extending transversely of array and provided with a plurality of individually movable tensioning members in the form of individual pistons respectively aligned and engageable with the strands; a hydraulic arrangement for shifting the support relative to said array in vertical direction for preliminary tensioning of the strand; and hydraulic cylinders for shifting the members individually for final tensioning of the respective strands.
The present invention relates to apparatus for the production of conveyor belts, bands and other relatively elongated bodies of elastomeric material having longitudinally extending reinforcing strands and, more particularly, to a strand-tensioning device for such installations.
In the commonly assigned copending application Ser. No. 611,620, filed Jan. 25, 1967, now Patent No. 3,459,848, and entitled Method of and Apparatus for the Manufacture of Reinforced Flexible Belts; there is disclosed and claimed an apparatus for the production of rubber conveyor belts and the like in which, downstream of a vulcanizing press, a plurality of stations are located for applying a pair of elastomeric strips to a planar array of steel reinforcing wires or strands individually stressed by suitable tensioning means. In this system, the strands may pass through a wire-straightening means to form a generally flat array of mutually parallel, transversely spaced, steel reinforcing wire; a pair of supply devices for applying respective core strips to the array of reinforcing wires; means for applying outer rubber strips; an equalizing precompression press for intermittently compacting the elastomeric bands about the wires; and means for vulcanizing the flexible layers of the core and the outer layers to the reinforcing strands. The system operates substantially continuously, i.e. the band passes in steps through the vulcanizing press, while the core layers and outer strips are applied more or less continuously via a traveling carriage. It has been found to be important in such installations to maintain the steel reinforcing Wires under tension during the press stroke and during the application of the several rubber layers to the array of core Wires and, moreover, to maintain each of the strands at an individual tension substantially independently of the remaining strands. In this manner, slackening of one or more strands at any of the stages in which the reinforcing array, core or band are clamped, is precluded and the pretension of the strands can be determined by the needs of the finished belt. Heretofore, such tensioning was effected by passing the cable or Wire about a plurality of pulleys at least'one of which was Weighted by direct application of a calibrated spring, by the application of a selected number of calibrated weights or by predetermined stressing of a lever upon which the tensioning pulley was 3,502,535 Patented Mar. 24, 1970 mounted. Such systems have not, however, been highly successful and have often required clamping means both on the inlet and outlet side of the tensioning device, which caused problems with respect to the continuity of conveyor-belt production. Moreover, the systems were impractically large, of expensive and complex manufacture and required continuous time-consuming adjustment.
It is, therefore, the principal object of this invention to provide an improved tensioning device in an apparatus for the manufacture of conveyor belts and the like, whereby the individual reinforcing elements can be tensioned selectively and relatively high levels of tension can be applied to the entire array.
It may be noted that there have been proposed systems in which the movable pulley of a tensioning device has been hydraulically actuated, but these systems too have experienced difliculties especially with respect to the dimensioning of the unit. For example, when relatively high levels of tension must be attained, the economics of the hydraulic system requires that the cylinders have relatively large diameters. On the other hand, the individual Wires or reinforcing elements must be relatively closely spaced in conveyor-belt assemblies and the mutual contradiction of these two requirements have proved incapable of optimization in conventional systems. Furthermore, the strokes of the individual pistons for the desired level of tensioning varies with the yieldability or elongatability of the tensioned elements and even the initial tensioning movements frequently have exceeded the capacity of conventional units of this type.
It is therefore a specific object of this invention to provide an improved hydraulic apparatus for the individual tensioning of the core elements of a conveyor belt whereby the disadvantages of earlier hydraulic systems can be obviated.
Still another object of this invention is to provide a relatively simple and economical device for selectively and individually tensioning a multiplicity of relatively closely spaced reinforcing strands of a conveyor belt-production plant and for collectively prestressing same.
These objects and others, which will become apparent hereinafter, are attained, in accordance with the present invention, by an installation for the production of conveyor belts and like relatively elongated flat bodies having an array of mutually parallel transversely spaced reinforcing strands as described and claimed in application Ser. No. 611,626 of January 25, 1967, wherein, how ever, the means for individually tensioning the reinforcing wires comprises a cylinder assembly having a plurailty of hydraulic cylinders each associated with a respective reinforcing strand and having a respective piston engageable with this strand via a tensioning pulley or the like, the cylinder assembly being provided with means for shifting it in the direction of movement of the individual tensile pistons. "l his tensioning system is used, of course, in conjunction with an input clamping means between the wire-supply apparatus and the tensioning system, and an output clamping means between the tensioning system and the layer-applying arrangement. the cylinder assembly, according to this invention, comprises a cylinder block running athwart a multiplicity of the transversely spaced mutually parallel reinforcing strands and is provided with a multiplicity of cylinder bores extending perpendicularly to the plane of the array of strands, each bore having an axial plane in which the corresponding strand substantially lies. The bores are disposed in staggered relationship on opposite sides of a median plane perpendicular to the array and, advantageously forming an axial plane of the mechanism for raising and lowering the cylinder block. This mechanism can comprise a further hydraulic cylinder whose piston is surmounted by the block and vertically shifts the latter with respect to a framework above the array in which the idler pulleys are journaled. Thus, the tensioning elements associated with each strand can comprise a pair of idler pulleys dependent from the frame and longitudinally spaced in the direction of movement of these strands and a vertically shiftable pulley disposed between the depending idler pulleys and carried by the respective piston which slidably is received in the cylinder bore directly below the strand. The pretensioning or main cylinder will, of course, be dimensioned to carry the cylinder block and to apply a preliminary stress to all of the strands associated therewith via the individual tensioning pistons. Advantageously, the cylinder bores of the common block are connected in parallel to a common hydraulic line through which hydraulic fluid is supplied to the tensioning pistons.
In operation, the steel wires are individually threaded through a straightening device, if necessary, from the supply wheels and then are passed through the input clamp, around the idler-tensioning pulleys of the individual tensioning assembly, drawn through the output clamp and then passed through the layer-applying arrangement (see application Ser. No. 611,626) and introduced with the layers into the vulcanizing press. The array is then locked into position on the output side of the tensioning system via the output clamp and/or the vulcanizing press, while the input clamp is closed onto the array to apply a light pressure to the steel wires without, however, immobilizing them completely. Thus the wires can be drawn through the input clamp during the tensioning action against a frictional resistance of the platens.
During the initial tensioning movement, the cylinder block is raised and the various elongatabilities of the reinforcing strands are compensated by slip through the initial clamp which is then closed tightly. The tensioning is now effected by further advance of the cylinder block until the individual wires are pre-tensioned to a degree below the normal level of tension for operation of the system. During this pre-tensioning period, there is at least a partial equalization of the tensile stress upon all of the wires. A further equalization of the tensile stress is effected by hydraulically charging the individual cylinders in parallel so that the pressure applied by the respective pistons to each of the strands is identical throughout the array. When, however, the individual strands are to be tensioned to different magnitudes, the supply of hydraulic fluid to the individual cylinders after the tensioning movement of the cylinder block will depend upon the hydraulic fluid pressure in the respective cylinder.
According to a further feature of this invention the manifold passage communicating with the cylinder bores of the block is provided integrally (e.g. by machining) in the block, thereby eliminating the need for flexible hydraulic lines and the like for each of the individual tensioning arrangements. Advantageously, each of the cylinder bores is provided with a respective extension whose diameter is somewhat less than the diameter of the respective piston head and which is coaxial therewith and machined into the cylinder block, these extensions communicating with lateral ducts opening into the manifold passage.
The pistons each are provided with blade-like extensions fixed to the piston rods and carrying the tensioning pulleys which pass between depending blade-like members upon which the idlers are journaled. The idler blades can be carried by a rack disposed directly above the cylinder block and having idler pulleys which are substantially tangent to the plane of the array.
The device thus occupies relatively little space and can be operated with a minimum of technological difficulty.
The above and other objects, features and advantages of the present invention will become more readily appar- 4 ent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is an elevational view of a portion of an apparatus for making conveyor belts and incorporating a tensioning device in accordance with the present invention;
FIG. 2 is a plan view of the tensioning device, greatly enlarged and partly diagrammatic, showing the lay-out of the idler pulleys, the tensioning pulleys and the cylinder bores;
FIG. 3 is a cross-sectional view taken along the line IIIIII of FIG. 2;
FIG. 4 is a cross-sectional view taken along the line IVIV of FIG 3; and
FIG. 5 is an elevational view of a modification of the tensioning device.
In FIG. 1, we show the tensioning system of an apparatus for the production of conveyor belts, the balance of which may be constituted as described and illustrated in the copending application Ser. No. 611,626. The apparatus basically comprises a supply system S for delivering a multiplicity of strands 1, e.g. steel wires, from supply reels 20 to the vulcanizing press and the means for applying the rubber layers to the core wires 1 and represented at A. The reels 20 are provided with axles 21 rotatably received in notches 22 between a pair of support plates 23 mounted upon a pedestal 24 of the supply station S. Each wire 1 passes around a guide roll 25 so that, upon emergence from the supply device 3, the longitudinally extending, transversely spaced parallel wires 1 lie in a horizontal plane represented at P. The Wires individually pass through straightening eyes 26 of a straightening arrangement R which is constituted as generally described in the aforementioned copending application. Individual eyes 26 are mounted upon the pedestal 27 and form a comb-like guide for the parallel strands.
From the straightening device R the planar array of strands passes between the platens 2a, 2b of a clamping device 2 at the input side of the tensioning means represented at 4. The platen 2b rests upon the pedestal 2c of the clamp while the platen 2a is vertically movable (arrow 2d) and is guided by a frame 2e upon which a piston arrangement 2] is disposed. The piston 21 of the latter carries the platen 2a and is designed to lower it into frictional engagement with the wires 1 or complete disengagement of the latter and into the tight gripping of these wires in the three positions of the clamp. The clamp is illustrated in greater detail in the aforementioned application.
The tensioning device 4 comprises, as can best be seen from FIGS. 1 and 3, a traverse 7 which extends athwart the array of wires 1 above the plane P thereof and is provided with depending arms 7a and 7b in staggered pairs (see FIG. 2), each pair of arms 7a or 71) carrying a respective pair of stationary idler rollers 6. The rollers 6 of each pair of arms and a respective roller 14 of the tensioning mechanism for each wire is coplanar therewith, i.e. lies in a vertical plane P,, of the respective wire. The traverse 7 is fixed to a support structure represented diagrammatically at 70, and co-operates with the vertically shiftable cylinder block 10 whose direction of movement is represented by the arrow 11. To this end the cylinder block 10 is supported on a system 12a of a relatively large-diameter pre-tensioning hydraulic cylinder 12 in a well 11a of the plant. The cylinder block 10 is integrally formed (FIG. 3) with a multiplicity of vertical bores 8 which can be provided with cylinder linings for sealing engagement with the head 9 of the respective piston 9a. The cylinder bores 8 associated with the adjacent strands 1 are staggered in two vertical planes P and P offset in the direction of displacement of the wires 1 (arrow 11b). Thus each of the pistons 9a and the respective bores 8 is disposed directly beneath the respective strand 1 (FIG. 2), and the corresponding strand lies in the plane P,,, which, moreover, is an axial plane of the cylinder bore and the respective piston. The strand passing around each pair of idlers 6 and the respective tensioning pulley 14 form a tensioning loop 5 in the corresponding plane P two such loops being illustrated in FIG. 3 in dot-dash and dotted lines, respectively. The cylinder bores 8 are closed on the upper side of the cylinder block 10, which extends outward the array of wires 1 directly beneath and parallel to the traverse 7, by a blade a which is formed with openings 10b coaxial with the bores 8 and slidably clearing the piston 911.
Each of the cylinder bores 8 is formed with a coaxial extension 8a of a diameter smaller than that of the piston head 9 and communicating with a respective bore a lying in the respective plane P and communicating with a manifold bore 15 running longitudinally through the block 10 between the rows of cylinder bores 8. The cylinder bores 8 are thus fed with hydraulic fluid in parallel, the terminus 15b of the channel 15 being supplied with hydraulic fluid through a conventional control line. Thus each of the pistons 911 can be shifted by the hydraulic fluid delivered to the manifold channel 15 in the direction of arrows 9b while the cylinder block 10 is movable independently of this individual piston movement via the piston 12a and the cylinder 12 which, in turn, is controlled by a valve system not shown.
The pistons 9a each carries a blade-like extension 13, laterally offset from the respective plane P (see FIG. 4), the blades 13 having .pins 14:: upon which the respective pulleys 14 are journaled. Similarly, the blade-like depending arms 7a: of the traverse 7 carry pins 6a upon which the pulleys 6 are mounted. It will be understood that, while only a single cylinder block 10 is illustrated in FIG. 2, the tensioning means can be subdivided transversely of the wires 1 and longitudinally of the block into a plurality of cylinder blocks each having a respective piston 12 for its displacement. Each of these cylinder blocks will then be provided with a multiplicity of cylinder bores 8 with telescoping pistons 9, 9a. From FIG. 2, it can be seen that the branch channels 15a connect the bores 8 in parallel to the manifold channel 15 so that the same hydraulic pressure is maintained below the pistons 9, 9a, in each bore 8 and, in spite of the fact that the strokes of these pistons may vary with the degree of elongation of the reinforcing wires 1 and the need to take up any slack therein, all of these Wires will be individually tensioned to an identical prestress upon hydraulic energization of the manifold channel 15.
Downstream of the wire-tensioning mechanism 4, there is provided the means for applying the array of wires 1 a pair of core strips, a precompression press for compacting the core strips about the array of wires, a further device for applying the outer strips to the core thus formed and the vulcanizing press, all constituted as described in the aforementioned application Ser. No. 611,626 and located in the region A of the plant.
Beyond the vulcanizing press, We provide a further clamping arrangement 3 whose platens 3a and 3b engage the completed belt 3g when the vulcanizing press is opened. The platen 3b rests upon the pedestal 3c of this output clamp while a hydraulic cylinder arrangement 3] is carried out by the frame 3e of the clamp and has pistons 3f which raise and lower the platen 3a.
In operation, the belt is fixedly held by the clamp 3 downstream of the tensioning device 4 through which the wires 1 from the supply reels have been threaded. The clamp 2 is closed to engage the wires 1 relatively lightly, i.e. to permit sliding movement of the wires 1 against a frictional retarding force. The cylinder block 10 is then raised by the hydraulic-cylinder arrangement 12, 12a to form loops 5 (FIG. 3) in the wires 1 passing around each pair of fixed idler pulleys 6 and a respective tensioning pulley 14. The pre-tensioning force thus applied to the wires compensates or equalizes the possibly non uniform longitudinal yieldability of the steel reinforcing wires 1.
Thereafter, clamp 2 is tightened to fix the array of Wires upstream of the tensioning device 4 and hydraulic fluid is supplied to apply upward hydraulic force of equal magnitude to all of the pistons 9, 9a and thereby subject the individual Wires 1 to a predetermined level or tension. The vulcanizing press can then be closed to bond the outer layers to the core layers and the core layers to the reinforcing wires 1 of the stretch of band within the vulcanizing press and which has previously passed through the layer-applying means. The pistons 9, 9a are, prior to the application of hydraulic fluid pressure to the block 10 via the channel 15, in predetermined starting positions which may be intermediate positions with respect to their total stroke or end limiting positions in which the pistons are fully received in the respective cylinder bores 8, depending upon the requirements of the system. Upon vulcanization of the stretch of band within the press, clamp 3 is opened, the press separated, clamp 2 is opened and the block 10 lowered to release the wires 1 and permit a further length thereof to be drawn to the line. As this length of wires is advanced, it is coated with the layers as described above and the sequence of steps for tensioning the wires is repeated.
It has been found that this system is highly advantageous not only for steel reinforcing wires but for strands of material which are more or less extensive by comparison with steel. Thus, for example, the system may use monofilamentary or polyfilamentary synthetic resin strands, twisted or braided fiber cord or the like.
In FIG. 5, we show a modified tensioning device 40 which may be substituted for the system illustrated in FIGS. 1-4 and which comprises, in place of the cylinder block 10, a beam 41 which carries a multiplicity of vertically shiftable and independently guided blade members 42 carrying tensioning pulleys 43 adapted to co-operate with the pulleys 6 of the traverse 4 illustrated in FIG. 3. The guide means for the bars 42 is represented by an elongated slot 44 in the beam 41 for each of the bars and a guide pin 45 thereof, slidably received in the respective slot 44. The bars alternately disposed along the beam 41 transversely of the wires 1 are staggered in the direction of the major dimension of the wires as illustrated at the left-hand sides of FIG. 2. To tension the wires 1 uniformly after the beam has been elevated by vertically shifting the bars 42, a flexible cable 46 is anchored to a stationary support 47 via a relatively stiff coil spring 48 and tension is applied to the flexible cable 46 via a cylinder 49 and its piston rod 50. The cable 46 undershoots respective pulleys '51 journaled on the bars 42 below the tensioning pulleys 43 and overshoots stationary idler roller '52 carried by uprights 53 upon the beam 41. The latter is, in turn, provided with a main hydraulic cylinder 54 Whose piston 54a raises and lowers the beam.
The device in FIG. 5 operates generally in the manner previously described with the initial tensioning of the Wires 1 being effected by a raising of the beam 41 by the hydraulic cylinder 54, 54a. Upon tight closure of the clamp 2, tension is applied to the cable 46 by the hydraulic cylinder 49, 50 in the direction of arrow 55 and a uniform tension is applied via the loops 5 and the tension wheels 43 to the individual wires with the wheels 43 and the bars 42 assuming relative vertical positions in dependency upon the degree of stretch of the individual wires as may be necessary to reach the predetermined tension.
We claim:
1. In an apparatus for the production of reinforced elongated bodies wherein an array of mutually parallel longitudinally extending tensioned reinforcing strands are bonded to the body, the improvement which comprises a device for individually tensioning said strands, said device including a support extending transversely of said array and provided with a plurality of individually movable tensioning members respectively aligned and engageable with said strands; first means for shifting said support relative to said array for preliminarily tensioning said strands; and second means for shifting said members relative to said support for final tensioning of the respective strands.
2. The improvement defined in claim 1 wherein said array lies substantially in a horizontal plane and said first means includes a pistonand-cylinder arrngement for raising and lowering said support.
3. The improvement defined in claim 2 wherein said device further comprises a traverse extending athwart said array on a side thereof opposite that along which said support extends, said traverse being provided with respective idler pulleys forming tensioning loops with the respective members of said support.
4. The improvement defined in claim 3 wherein said tensioning members are upright blades carrying tensioning pulleys lying substantially in common vertical planes with the respective idler pulleys and strand.
5. The improvement defined in claim 2 wherein said support is a cylinder block and said second means includes a multiplicity of cylinder bores formed in said block in line with the respective strands, said members including pistons respectively slidable in said bores and having tensioning pulleys engageable with the respective strands.
6. The improvement defined in claim 5 wherein said cylinder block is provided with channels for delivering hydraulic fluid to said bores in parallel.
7. The improvement defined in claim 6 wherein each of said pistons is provided with a blade-shaped extension carrying the respective tensioning pulley.
8. The improvement defined in claim 6 wherein said channels and said bores are formed unitarily in said cylinder block.
9. The improvement defined in claim 2 wherein said second means includes further piston-and-cylinder arrangements carried by said support and individual to said strand, said support being provided with channels for communicating a fluid medium to said further pistonand-cylinder arrangements.
10. The improvement defined in claim 2 wherein said second means is a tensioning cable common to said tensioning members for transmitting a tension force thereto in parallel.
References Cited UNITED STATES PATENTS 2,062,008 11/1936 Lewis et al. 24258 3,072,360 1/1963 Cruz 242154 3,273,861 9/1966 Schuff 254 X 3,276,938 10/1966 Malewski l56494 3,345,229 10/1967 Harpfer l56494 X ROBERT F. STAHL, Primary Examiner US. Cl. X.R.
US634749A 1966-04-30 1967-04-28 Apparatus for tensioning reinforcing strands for belts and the like Expired - Lifetime US3502535A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES103571A DE1282912B (en) 1966-04-30 1966-04-30 Device for tensioning the longitudinal ropes, especially steel or plastic ropes, of reinforcing inserts for conveyor belts

Publications (1)

Publication Number Publication Date
US3502535A true US3502535A (en) 1970-03-24

Family

ID=7525299

Family Applications (1)

Application Number Title Priority Date Filing Date
US634749A Expired - Lifetime US3502535A (en) 1966-04-30 1967-04-28 Apparatus for tensioning reinforcing strands for belts and the like

Country Status (4)

Country Link
US (1) US3502535A (en)
DE (1) DE1282912B (en)
GB (1) GB1141736A (en)
NL (1) NL143472B (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584747A (en) * 1969-07-31 1971-06-15 Georgia Pacific Corp Line shortener for grapple log-yarding apparatus
US3707252A (en) * 1971-09-10 1972-12-26 Allegheny Ludlum Ind Inc Automatic tensioning device for multiple line strip
US3793118A (en) * 1971-02-01 1974-02-19 Clouth Gummiwerke Ag Apparatus for manufacturing conveyor belts with steel cable inserts
US3998432A (en) * 1976-01-02 1976-12-21 Charles D. Uldricks Air operated load balancing hoist
US4261782A (en) * 1980-02-08 1981-04-14 Riegel Textile Corporation Apparatus for attaching elastic strips during the manufacture of elastic leg disposable diapers
US4341270A (en) * 1980-06-16 1982-07-27 Great American Development Co. Drill string suspension tower
EP0257459A2 (en) * 1986-08-12 1988-03-02 SAG - Wytwornia Lin Stalowo-Gumowych, Spolka z o.o. A method and plant for the manufacture of steel-rubber shaft ropes
US4924567A (en) * 1988-09-30 1990-05-15 Mccoy-Ellison, Inc. Apparatus for controlling tension in a traveling yarn
US5964392A (en) * 1997-08-22 1999-10-12 The Whitaker Corporation Wire dereeling unit and marking unit for a wire processing machine
WO2002086348A1 (en) * 2001-04-18 2002-10-31 The Coe Manufacturing Company Belt making apparatus and method
CN102051981A (en) * 2010-11-19 2011-05-11 中国核工业华兴建设有限公司 Adjustable stranded wire clamping conveying device
US20130098525A1 (en) * 2010-02-18 2013-04-25 Steffen Aumueller System and method for producing conveyor belts having a wire rope core

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3443889A1 (en) * 1984-12-01 1986-10-16 Continental Gummi-Werke Ag, 3000 Hannover METHOD FOR OPERATING A MANUFACTURING DEVICE FOR CONVEYOR BELTS
WO1994029046A1 (en) * 1993-06-04 1994-12-22 Maschinenfabrik Niehoff Gmbh & Co. Kg Process and device for modifying the cross-section of elongate goods
CN102174297B (en) * 2010-12-21 2013-10-16 周炳光 Solid silicone tape production equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062008A (en) * 1935-07-31 1936-11-24 Firestone Tire & Rubber Co Uniform tension device
US3072360A (en) * 1961-05-24 1963-01-08 Ronson Corp Tensioning apparatus for pliable material
US3273861A (en) * 1964-07-06 1966-09-20 Richard W Schuff Precision positioning device
US3276938A (en) * 1961-05-25 1966-10-04 Theodore S Malewski Machine for laminating webs of material
US3345229A (en) * 1963-12-04 1967-10-03 Goodyear Tire & Rubber Belt manufacturing apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1208483B (en) * 1962-09-29 1966-01-05 Continental Gummi Werke Ag Method and device for producing a conveyor belt

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2062008A (en) * 1935-07-31 1936-11-24 Firestone Tire & Rubber Co Uniform tension device
US3072360A (en) * 1961-05-24 1963-01-08 Ronson Corp Tensioning apparatus for pliable material
US3276938A (en) * 1961-05-25 1966-10-04 Theodore S Malewski Machine for laminating webs of material
US3345229A (en) * 1963-12-04 1967-10-03 Goodyear Tire & Rubber Belt manufacturing apparatus
US3273861A (en) * 1964-07-06 1966-09-20 Richard W Schuff Precision positioning device

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584747A (en) * 1969-07-31 1971-06-15 Georgia Pacific Corp Line shortener for grapple log-yarding apparatus
US3793118A (en) * 1971-02-01 1974-02-19 Clouth Gummiwerke Ag Apparatus for manufacturing conveyor belts with steel cable inserts
US3707252A (en) * 1971-09-10 1972-12-26 Allegheny Ludlum Ind Inc Automatic tensioning device for multiple line strip
US3998432A (en) * 1976-01-02 1976-12-21 Charles D. Uldricks Air operated load balancing hoist
US4261782A (en) * 1980-02-08 1981-04-14 Riegel Textile Corporation Apparatus for attaching elastic strips during the manufacture of elastic leg disposable diapers
US4341270A (en) * 1980-06-16 1982-07-27 Great American Development Co. Drill string suspension tower
EP0257459A2 (en) * 1986-08-12 1988-03-02 SAG - Wytwornia Lin Stalowo-Gumowych, Spolka z o.o. A method and plant for the manufacture of steel-rubber shaft ropes
EP0257459A3 (en) * 1986-08-12 1989-11-02 Katowickie Gwarectwo Weglowe Kopalnia Wegla Kamiennego Wieczorek A method and plant for the manufacture of steel-rubber shaft ropes
US4924567A (en) * 1988-09-30 1990-05-15 Mccoy-Ellison, Inc. Apparatus for controlling tension in a traveling yarn
US4984341A (en) * 1988-09-30 1991-01-15 Mccoy-Ellison, Inc. Apparatus for controlling tension in a traveling yarn
US5964392A (en) * 1997-08-22 1999-10-12 The Whitaker Corporation Wire dereeling unit and marking unit for a wire processing machine
WO2002086348A1 (en) * 2001-04-18 2002-10-31 The Coe Manufacturing Company Belt making apparatus and method
US20050034805A1 (en) * 2001-04-18 2005-02-17 Clinton Spangler Belt making apparatus and method
US20130098525A1 (en) * 2010-02-18 2013-04-25 Steffen Aumueller System and method for producing conveyor belts having a wire rope core
US9278493B2 (en) * 2010-02-18 2016-03-08 Siempelkamp Maschinen—Und Anlagenbau Gmbh System and method for producing conveyor belts having a wire rope core
CN102051981A (en) * 2010-11-19 2011-05-11 中国核工业华兴建设有限公司 Adjustable stranded wire clamping conveying device
CN102051981B (en) * 2010-11-19 2012-10-31 中国核工业华兴建设有限公司 Adjustable stranded wire clamping conveying device

Also Published As

Publication number Publication date
DE1282912B (en) 1968-11-14
NL6705462A (en) 1967-10-31
NL143472B (en) 1974-10-15
GB1141736A (en) 1969-01-29

Similar Documents

Publication Publication Date Title
US3502535A (en) Apparatus for tensioning reinforcing strands for belts and the like
US4017248A (en) Continuously operating panel press
US3801250A (en) Apparatus for exerting continuous pressure
GB1582503A (en) Method and apparatus for manufacturing hose
US2740459A (en) Method and apparatus for building wire reinforced conveyor belts
US3607561A (en) Apparatus for the manufacture of reinforced flexible belts
EP1013549B2 (en) Method and device for enveloping a stack of goods
US4368014A (en) Apparatus for producing vulcanized belts with steel reinforcement
US4685190A (en) Method of operating an appparatus for producing conveyer belts
US3272680A (en) Apparatus for making reinforced rubber belting
US3345229A (en) Belt manufacturing apparatus
US3684606A (en) Method of making reinforced belting
US3793118A (en) Apparatus for manufacturing conveyor belts with steel cable inserts
EP0257459A2 (en) A method and plant for the manufacture of steel-rubber shaft ropes
CN107253594B (en) Production equipment and production process of conveying belt
US4036572A (en) Belt tensioning device for a vulcanizing press
US5309829A (en) Apparatus for producing juice from a fruit mash
DE2528219C3 (en) Device for the production of conveyor belts
DE102010008530A1 (en) Conveyor belt manufacturing system, has combining device formed as continuously working combining device, where combining device combines raw rubber paths in raw belt with moving ropes during transporting of ropes
US3862559A (en) Method and device for making conveyor belts
DE2441081A1 (en) SYSTEM FOR THE VULCANIZATION OF A CONVEYOR BELT OR THE SAME
DE1208483B (en) Method and device for producing a conveyor belt
DE2653620A1 (en) METHOD AND DEVICE FOR VULCANIZING CONVEYOR BELTS AND THE LIKE MADE OF ELASTOMERED MATERIAL
DE102010008528A1 (en) Plant for the production of conveyor belts with steel cable insert
DE2601297A1 (en) Rapidly vulcanising steel reinforced rubber belting - by partly curing in press and completing vulcanisation in secondary heater