EP0123231A1 - Bending machine - Google Patents

Abstract

1. A bending machine for manufacturing sized angular reinforcing rods from reinforcing wire (7), with a bending unit (1) comprising a working surface (A) to which the feed path of the reinforcing wire (7) extends parallel, a core (4) which is vertically displaceable to the working surface (A) and has two bending heads (6) limiting a groove, and a bending tool displaceable parallel to the core (4) and disposed eccentrically at an annular body (5) optionally rotatable in both directions about the core (4), and comprising a cutting device (10, 26) disposed directly ahead of the bending unit (1) and provided with a stationary (10) and a movable cutting edge (26) displaceable vertically to the moving wire (7), characterized in that the annular body (5) is arranged in the bending unit (1) in an axially undisplaceable and turnable manner, and that two independent parallel displaceable bending bolts (8) forming the bending tool are arranged in the annular body (5), an individual displacing device arranged at the annular body (5) being associated with each bending bolt (8).

Description

The invention relates to a machine for the production of cut, angled reinforcing bars made of reinforcing wire, with a bending unit which has a core extending perpendicular to the feed path of the reinforcing wire with two bending heads defining a groove and a parallel to the core, optionally rotatable in both directions about the core Bending tool, and with a cutting device provided directly in front of the bending unit with a fixed and a movable cutting edge that is displaceable perpendicular to the reinforcing wire.

AT-B-314 319 shows a bending machine which is used in particular for the production of right-angled reinforcement stirrups for reinforced concrete construction. It is particularly advantageous or necessary for the bending of differently shaped reinforcing bars that the reinforcing wire can be bent in both directions on the bending plane around a fixed bending head. For this purpose, a bending pin is used, which can be brought from one side of the reinforcement wire to the other side by pulling the bending pin in, pivoting it under the reinforcement wire and finally pushing it out again. After completing each bending process, the bending pin must be moved back to its starting position so that the reinforcement wire can continue to be fed. The bending pin is formed on a cranked hollow shaft in which an ejector is axially displaceable, by means of which the bent reinforcement rod is ejected from the groove between the bending heads after it has been separated off by the cutting unit provided directly next to the bending unit. The expenditure on equipment of the bending machine is relatively large, since attempts are made to obtain constant coupling with the drive despite adjustable bending angle, selectable bending device and axial displaceability of the bending pin, since an embodiment with two bending pins, each of which is intended for a specific direction of rotation, and should be able to be coupled to the drive than is considered to be even more complicated.

A bending machine of the type mentioned at the beginning shows AT-B-344 476, according to which an annular body surrounding the core equipped with the bending heads is provided as a carrier for the single bending pin, which is pulled into the machine to change the bending direction, rotated and extended again . The core is also axially retractable together with the ring body in order to pull the wire back against the feed direction to cut the bent rods, since this is set back in the feed direction at a distance from the bending unit.

Another bending machine is shown in AT-B-368 724, according to which the bending pin is arranged on a cranked shaft, an axial stub shaft forming a single bending head. So that the only bending head can now be used for bending on both sides, the wire feed device can be displaced in a plane perpendicular to the shaft, so that the cut wire end is advanced either to the left or right of the bending head. Of course, it is also necessary to change the eccentric bending pin from one side to the other. The reinforcing wire runs through a tunnel in the wire feed, ending at the bending head, whereby the pivoting movement of the bending pin is limited to about 180 ^0th The front edge of the cover forms a cutting edge which interacts with a second cutting edge formed on the laterally projecting support arm of the bending pin. This lies in the area of the wire passage channel between the bending head and the bending pin on both sides of the support arm. The entire shaft with bending head and bending pin can be axially displaced by means of an eccentric, the side change of the bending pin in the lowest position, the bending process in the middle position and the cut of the bent reinforcement wire when extended to the highest position. The displaceability of the wire feeder requires a relatively complicated construction of this part of the bending machine.

The invention has now set itself the task of creating a machine of the type mentioned, which has a simple structure and allows the production of bent reinforcement bars with free choice of the bending direction and freely definable bending angle with high working speed.

According to the invention this is achieved in that in the ring. body which is mounted axially immovable and drivable on the core, the bending pin is arranged to be displaceable parallel to the core, the bending pin being assigned a displacement device arranged on the ring body.

There is thus an embodiment in the bending machine according to the invention in which the respectively advantageous components of known devices are combined to form an extremely simple and rationally designed combination, this being achieved above all by designing the feed device of the bending pin on the rotating ring body. This is the most important prerequisite for the other preferred variants. Thus, the storage of the axially non-displaceable ring body, in which a high torque must be introduced for the bending process, can be substantially improved, the ring body also being able to be formed in the thickness required for this, which also extends the sliding guidance of the axially displaceable bending pin .

Furthermore, as provided in a preferred embodiment, a second independently displaceable bending spigot can be provided without a substantial change in the construction, as a result of which the working speed is increased, since there is no need to redesign the bending spigot. The bending pin carrying out the bending work is drawn in beforehand after completion of a bending process in order not to hinder the further advance of the already angled reinforcement wire, so that the advance can start immediately after the bending pin is drawn in. In the meantime, the retracted bending pin is rotated into the starting position and pushed out again, so that the next bend can take place immediately after completion of the feed. However, if the turn to the other side is now desired, the bending pin not required in the previous bending process is pushed out and the first stays in. Here, too, the next bend can be carried out immediately after the feed has been completed.

Since the bending pins are not moved under load, small drive devices with low power can be used.

In a preferred embodiment it is therefore provided that two bending pins are individually displaceable parallel to the core in the ring body, each bending pin being assigned its own shifting device.

The drive of the bending machine can thereby also interact directly with the ring body, which can be provided with spur gearing for this purpose, into which a pinion or a drive worm engages, which or the. is preferably operated by an electric motor. The space required by the bending unit is extremely small, so that the manufacturing costs of the machine remain low.

There is now the further advantage of a simple and inexpensive design of the cutting device similar to that according to AT-B-368 724. In a preferred embodiment it is also provided that an ejector, which can be pushed out of the bending machine perpendicular to the working surface, is provided for the rebars which have been cut to length , which carries a movable cutting edge for the cut-to-length reinforcing bars, and that a fixed cutting edge is provided parallel to it at the front end of a cover spanning the supplied reinforcing wire in a tunnel-like manner.

Due to this design, the movements of the movable knife and the ejector are parallel, in the same direction and at the same time. The ejector itself represents the movable knife, so that a single drive fulfills both functions. A particular advantage results from the fact that the ejector carrying the movable cutting edge forms the core of the bending tool in the retracted position. Since the core carries the two bending heads and in the ring body is arranged centrally, it has a greater extension in the feed direction than would be necessary. However, the movable cutting edge is already at that distance from the center point which is necessary in order to allow the angle of rotation of the bending pin to substantially exceed on both sides from the starting position into its end position, so that a total turning range of approximately 300 ° can be achieved for the ring body. which can be even larger if the cutting edge is provided at the end of a tapered cover.

According to this version, the core fulfills a triple function; he is in the retracted position of the bending core, during the extension movement movable knife and after the cut ejector for the cut bars, because the work surface is not horizontal.

The invention will now be described in more detail below with reference to the figures in the accompanying drawings, without being limited thereto.

Fig. 1 shows a view of a machine according to the invention, Fig. 2 shows the plan view of the bending unit and part of the feed unit, Fig. 3 to 5 sections along the lines III-III, IV-IV and VV of Fig. 2 in different positions, and FIG. 6 shows a section along the line VI-VI of FIG. 4th

The bending machine for the production of reinforcing bars 7 ', 7 "from a reinforcing wire 7, which is drawn off from a reel, not shown, and is fed via straightening and feeding devices through the feed unit 2, is provided with a bending unit 1, which also directly has a cutting facility is assigned. The cut-to-length reinforcement bars 7 ″ bent into brackets are taken over by a receiving unit 3 which has a turnstile 27 arranged at an angle on rollers 28 with at least two, for example four, radially projecting bars 25 which can be moved into the correct position by means of handles 29 depends on the shape of the reinforcement bars 7 ″, reinforcement brackets of the same type being collected on a bar 25 and bundled, for example. The rods or bundles are removed after a rotation, after which the next rod 25 has reached the catch position, or slide due to the inclined position of the turnstile 27 during further rotation by itself into prepared collecting containers or the like.

The bending unit 1, which has a central core 4, from which two bending heads 6 which delimit a groove or receptacle protrude at the end, serves to shape the reinforcement bars 7 ″. The core 4 is surrounded by a drivable ring body 5, in which two projecting bending pins 8 The visible end face of the ring body 5 and the end face of the cylindrical core 4 lie in the work surface A, which is parallel to the supplied reinforcement wire 7 and thus also parallel to the bending plane, the work surface A being a vertical or forms a strongly inclined boundary plane on the working side of the machine, which is defined, for example, by a cladding plate 12 or other outer edge elements of the machine frame. The bending heads 6 and at least one bending pin 8 protrude from said plane A for the bending process, so that they are in the starting position each on the side are next to the reinforcement wire 7. This is dashed with respect to the bending pin 8 in Fig. 2 and shown in Fig. 4 in section. The core 4 can be pushed out axially to the front from the plane A, to which it is arranged perpendicularly, which will be explained in more detail below. The ring body 5 surrounding the core 4, in which the. Bending pins 8 are arranged, is rotatable, but not axially displaceably mounted on the guide tube 13 for the extendable core 4 (roller bearing 19) and has end teeth 18. The two bending pins 8 are provided in the annular body 5 at a distance from one another which essentially corresponds to the distance between the bending heads 6.

The feed unit 2, which is provided in the usual way with only schematically illustrated rollers 11, is provided at least in the region close to the bending unit with a cover 9 which forms a fixed cutting edge 10 on the front side.

The operation of the machine is now as follows: the reinforcement wire 7 is fed in the direction B through the feed unit 2 and enters the bending unit 1 at the front end of the cover 9, which is aligned with the assigned edge area of the end face of the core 4 in its push-out direction the two bending heads 6 and the two bending pins 8 (FIG. 1), which are shown in broken lines in FIG. 2, whereupon the feed is interrupted. When producing a bend, the bending pin 8 that is not required is preferably drawn in, so that its end face lies in plane A. The ring body 5 is now set in rotation, for example according to arrow C in FIG. 2, with the bending pins 8 in FIG. 2 being turned out after the rotation by the adjustable bending angle position shown in solid lines, in which the end of the reinforcing wire 7 is bent back, for example, by 120 °. The upper bending head 6 serves as a counter bearing. From this position the effective bending pin 8 is now drawn in, so that its end face lies in the working area A, and the further advancement of the reinforcement wire 7 can take place immediately. The ring body 5 is meanwhile rotated back into the dashed starting position according to FIG. 2, if necessary also further rotated into it, when the second bending pin 8 is also retracted. After reaching the desired leg length, the feed of the reinforcing wire 7 is interrupted again, during which the bending pin 8 required for the next bending process has been extended again. If the bend is to take place in the same direction, the lower bending pin 8 is used again, but for an opposite bend the upper bend. The process described is repeated until the desired shape of the reinforcing bar 7 "is reached. Now a cutting device is activated, which consists of the fixed cutting edge 10 and a movable cutting edge 26. The end of the cover 9 forming the cutting edge 10 is there approximately shaped like a tunnel and fixed to the cladding panel 12 or to a machine part located behind the work surface A. It covers part of the ring body 5, to which it can of course not be connected.

The ring body 5 could also be offset somewhat from the inside of the machine relative to the work surface A, so that the cladding plate 12 can also cover a sector of the ring body 5 for better fixing of the end of the cover 9 carrying the cutting edge 10, whereby due to the individual independent dependent displaceability of the bending pin no problems arise in the rotation of the ring body 5.

The movable cutting edge 26 is assigned to the fixed cutting edge 10 of the cover 9 and, as mentioned, is flush with the edge section of the end face of the core 4. As soon as the reinforcing wire 7 is to be cut to length, the core 4 is pushed out perpendicular to the working surface A at least to the extent that that the two cutting edges 10, 26 touch or overlap each other (FIGS. 4, 6), as a result of which the bent reinforcing bar 7 "is separated. Since the core 4 simultaneously acts as an ejector, the reinforcing bar 7" falls down and becomes from the bar 25 of the receiving unit 3 collected. The core 4 is withdrawn again and the shape of the next bracket can be started again after reaching its starting position.

However, the bending unit 1 cannot be put into operation if reinforcement bars 7 'are to be cut from the reinforcement wire 7. The pre. shear of the reinforcement wire is usually much longer; as soon as the required length is reached, it is displayed. hold and the core 4 pushed out again. - Because of their greater length, the reinforcement bars 7 '(thereby broken off in FIG. 1) fall into a collecting trough 24 which is at a sufficient distance from the bending unit 1 at the for the formation of the bracket Machine is arranged. The ends of each bar 25 of the turnstile 27 are resilient, so that they can avoid the ends of the reinforcing bars 7 'when falling into the gutter 24 and no faults occur. The resilient ends of the rods 25 also increase the safety of catching the bent Reinforcing bars 7, which point up or down depending on the shape and direction of bending and are naturally not ejected completely evenly.

3 to 6, the drive of the ring body, the bending pins and the core 4 provided with the movable cutting edge 26 and forming the ejector is shown. A pressure medium-operated device is particularly suitable for the axial movement of the core 4. This consists of a cylinder 15 in the extension of the fixed guide tube 13 of the core 4, on which the ring body 5 is also mounted, and which is fastened on a part of the machine which in particular forms a bridge 21. A piston 14 in which the cylinder 15 can be acted upon is supplied by a pressure medium, the direct, structurally simple and space-saving arrangement being of particular importance with regard to the production costs. The ring body 5 is driven via its spur toothing 18, in which, for example, a pinion 20 or a worm engages, these drive elements also being arranged directly on the output shaft 23, for example an electric motor 22, which is located under or immediately behind the bridge 21 for the cylinder 15 fits.

For the axial displacement of the two bending pins 8, which are slidably mounted in the ring body 5, very small drive devices with low power can be used. be used. The extension or retraction movement of the bending pin 8 is basically carried out with relieved bending pin. 4, in which a bent reinforcing bar 7 ″ has just been cut off by the core 4 pushed out, a threaded part 16 at the inner end have, which engages in a threaded sleeve connected to a small electric motor 30. Each of the two electric motors 30 is fastened on the ring body 5 and, depending on the direction of rotation, pushes its bending pin 8 out or in. The accommodation of the electric motors 30 in the annular space around the guide tube 13 presents no difficulties, and fixed connecting cables can also be provided if the direction of rotation of the annular body 5 is changed upon returning to the starting position.

The machine can be controlled in the usual way. A program control is preferably provided, to which the feed lengths and bending angles are entered, and according to the program sequence, the feed device, the ring body drive, the two bending pin drives. controls the drive of the core forming the movable cutting edge and the ejector, and possibly also a turnstile lift of the receiving unit. Instead of the electric motors 22 and in particular 30 described, pressure-medium actuated drives can of course also be provided. Likewise, the pressure medium actuated drive of the core 4 can be replaced by another type of drive.

Claims (7)

1. Bending machine for the production of cut, angled reinforcing bars made of reinforcing wire (7), with a bending unit (1), the one. Working surface (A), to which the feed path of the reinforcing wire (7) runs parallel, a core (4) that can be moved perpendicular to the working surface (A) with two bending heads (6) that delimit a groove, and an eccentric bending pin that can be moved perpendicular to the working surface (A) (8), which is provided on an optionally rotatable in both directions around the core (4) ring body (5), and with a cutting device (10,26) provided directly in front of the bending unit (1) with a fixed (10) and a movable cutting edge (26) which can be displaced perpendicularly to the reinforcement wire (7), characterized in that the bending pin (8) parallel to the core (4) in the ring body (5) which is axially immovable and driven on the core (4) is arranged displaceably, the bending pin (8) being associated with a displacement device arranged on the ring body (5). 2. Bending machine according to claim 1, characterized in that in the annular body (5) two bending pins (8) are individually displaceable parallel to the core (4), each bending pin (8) being assigned its own shifting device. 3. Bending machine according to claim 1 or 2, characterized in that each displacement device for a bending pin (8) has an electric motor (30) attached to the ring body (5). 4. Bending machine according to one of claims 1 to 3, characterized in that the ring body (5) is provided with end teeth, in which a pinion (20), preferably connected to an electric motor (22), engages. 5. Bending machine according to claim 1, characterized in that a perpendicular to the work surface from the bending machine ejector for the cut reinforcing bars is provided, which carries a movable cutting edge (26) for the cut reinforcing bars (7 ', 7 "), and that one fixed cutting edge (10) is provided parallel to it at the front end of a cover (9) spanning the supplied reinforcement wire (7) in a tunnel-like manner. 6. Bending machine according to claim 5, characterized in that the ejector carrying the movable cutting edge (26) forms the core (4) of the bending tool in the retracted position. 7. Bending machine according to claim 5 and 6, characterized in that the movable cutting edge (26) is formed by the edge portion of the end face of the core (4) lying in the region of the cover (9).

Images