EP0943423A2 - Heating device for a corrugating system - Google Patents

Abstract

A flowline process for the manufacture of corrugated cardboard has the prepared layers (21,22) fed over a heating line comprising an array of heating elements (3)and pressed onto the heating elements by pressure plates fitted under a support (5) set across the process line and with elastic springs (11) to provide an even pressure on the cardboard, or onto a pressure film (4.1) which moves with the cardboard. The pressure elements are weighted to provide the optimum pressure.

Description

The invention relates to a heating device for a corrugated cardboard plant, with several, one behind the other in the conveying direction of a corrugated cardboard web Heating plates, and at least one printing unit consisting of a cross to Direction of conveyance of the corrugated cardboard bearing arranged, at least a pressure element is attached.

Such a device on a corrugated cardboard system has the task of glue between tracks arranged one above the other, i.e. one-sided corrugated cardboard webs and finally the cover sheet to dry.

For this purpose a known device has heating plates which e.g. be heated with steam or thermal oil. A conveyor belt moves with the help of a Printing unit and its driven lower chord the corrugated cardboard webs to be glued along the surface of the heating plates. Press load elements the corrugated cardboard sheets against the surfaces of the heating plates to a corresponding Contact of the corrugated cardboard web with the hotplate surface, i.e. a good Heat transfer to the glue line.

Several systems are known as printing units, e.g. the use of weight rollers, the use of a pressure hood that works with compressed air, Bodies that rest directly on the conveyor belt due to their own weight, or plates which are pressed against the conveyor belt with spring force.

When using pressure hoods (EP 0 412 255 A1), additional energy is required for the compressed air required to put the pressure hood on the corrugated cardboard web to press. There is also a certain level of noise in the Drying area. In addition, heat energy is transported unnecessarily and the adjustment of the working width is complex.

For systems in which bodies with their own weight press on the belt (EP 0 559 181 A1) there is no damping, so significant dynamic forces may occur. The load elements are relatively far from the friction surface removed so that the frictional torque can become relatively large. About that In addition, the stressed bodies are subject to a tendency to turn, which leads to a Deterioration of the even surface contact with the heating plate surface can lead.

Another prior art describes a printing unit in which lower Plates are applied via compressed air chambers (US Pat. No. 5,526,739). This Known device is expensive and also has the Disadvantage that the application is not even.

The prior art also includes a printing unit in the form of a Load plate, which consists of several, which extend along the corrugated cardboard web Units exist (CA-PS 2,179,921). With this system the Corrugated cardboard directly applied, so that undesirable damage may occur.

Another known printing unit uses weight rollers, which over Intermediate lever arranged on a crosswise to the conveying direction of the corrugated cardboard web Bearings are attached (US Pat. No. 5,632,830). This system is also one Even loading of the corrugated cardboard palm is not guaranteed.

In the case of printing units with weighting rollers, these can also be used in all Speed ranges do not cause shocks, oscillations or vibrations, to avoid damaging the corrugated cardboard web. In operation it is also necessary that the weight rollers and the heating plates are almost perfect are flat to ensure a corresponding contact of the corrugated cardboard web and the To realize heating plates.

As a prior art, from which the present invention is based, is a system It is known in which plates spring force is applied (EP 0 623 459 B1). In addition, a conveyor belt is used. Any printing plate is mounted on a rigid crossbar via a double joint lever system, so that the printing plate experiences a plane-parallel movement. About spring elements applied to the pressure plate.

The disadvantage of this known system is that the pressure plate is not always is aligned parallel to the heating surface due to possible installation deviations and / or unevenness in the heating surface. Another disadvantage is that with different corrugated cardboard thickness the travel and thus also changing the pressing force. It is necessary to tension everyone Adjust the pressure plate according to the type of corrugated cardboard used.

Starting from the aforementioned prior art, the task of In contrast, the present invention in a heater of the beginning mentioned type to create a printing unit, which the aforementioned Avoids disadvantages and is able with little construction effort To apply corrugated cardboard web evenly and functionally reliably.

This object is achieved in that the pressure element freely movable only with at least one elastic medium with the bearing is connected and that the bearing via the elastic medium with its own weight lies freely on the pressure element. With this free movement the pressure element in all degrees of freedom gives the advantage of a uniform loading of the corrugated cardboard web to be processed. Hereby a considerable improvement in quality is achieved. The whole force either by own weight and / or by additional loading Load devices are distributed evenly over the entire area the pressure element and via this onto the corrugated cardboard web.

In a further embodiment of the invention, the bearing can be on both sides of the corrugated cardboard web in the level of the upper side of the conveyor belt on the machine frame be articulated. This results in a positive balance of power Pressure element opposite the loaded top of the lower run of the conveyor belt. Furthermore, thrust elements can be used, which friction forces take over from the pressure element. These push elements are relative close to the friction surface to minimize the torque of the pressure element. The entire unit is aligned in such a way that any tipping tendencies of the Pressure element can be avoided with an unexpected increase in friction.

The pressure elements can be provided with stop screws to the vertical Limit movement.

According to one embodiment of the invention, there is the possibility of at least an intermediate element and at least one intermediate lever between the Bearings and the machine frame.

Alternatively, at least one can also be in the conveying direction of the corrugated cardboard web Chain are used, on the links of which the individual pressure elements are articulated are. This chain can be guided in a guide of the machine frame and have an angular element which can be acted upon by a lifting element.

The elastic medium that lies between the bearing and the pressure element is at least one spring or at least one rubber element or an elastic air hose, which is the freely movable pressure element evenly applied.

According to one embodiment of the invention, there is the possibility that the Pressure element encloses the bearing. Here, the camp between top and lower spring pairs of the pressure element can be clamped, the bearing connected to the impact elements which can be acted upon on the inside of the pressure element is.

In another embodiment of the invention, there is the possibility that the Pressure element C-shaped and horizontal over at least one elastic Medium is freely movable on the underside of the bearing. Between The pressure element and the underside of the bearing can be an intermediate plate are located, which supports the aforementioned shock elements.

In the aforementioned embodiment, the bearing can each have an intermediate lever attached to a traverse extending across the corrugated cardboard web be, which traverse can be acted upon via a piston-cylinder unit is. To lift or adjust, you can choose between the one connected to the crossbar Intermediate lever and each bearing a lifting unit with limiting elements Find application.

In order to adapt even better to the corrugated cardboard web to be processed achieve, there is a possibility that the C-shaped pressure elements in each Edge area a greater length and spaced apart Have recesses.

According to a further feature of the invention, a spring leaf can be used all over Pressure width lie on the inner surface of the pressure element, the spring leaf is attached via a plate and fasteners in the pressure element.

In a further embodiment of the invention there is also the possibility that the Pressure elements and bearings attached to at least one revolving conveyor chain are, this conveyor chain with spaced sprockets cooperates. It is also possible that the pressure element with a heater is equipped, for which purpose the pressure element runs lengthways and crossways Can have holes, which with elastic hoses or pipes at least one heating medium source is connected.

In all of the aforementioned embodiments, it is also structurally possible for the bearing vertically via at least one piston cylinder unit that can be raised and lowered is movable in addition to the own weight of the pressure elements another To enable loading of the corrugated cardboard web to be processed.

In a further embodiment of the invention, the pressure elements can either be on a conveyor belt or act directly on the corrugated cardboard web. Furthermore the pressure device can also be pressed from below against an upper heating or support surface act on the corrugated cardboard web.

According to another feature of the invention, the device according to the invention as a pressure system both in a heating section and in a train section a corrugated pasting machine can be used.

Fig. 1

eine schematische Seitenansicht einer Ausführungsform der Erfindung;

Fig. 2

einen Schnitt gemäß der Linie II-II in Fig. 1;

Fig. 3

eine vergrößerte Darstellung einer ersten Ausführungsform des Druckelements in schematischer Seitenansicht in Pfeilrichtung III-III nach Fig. 2;

Fig. 4

eine weitere Ausführungsmöglichkeit der Gestaltung des Zwischengelenks bei einer Ausführungsform gemäß Fig. 3;

Fig. 5

eine weitere Ausführungsmöglichkeit der Erfindung in schematischer Vorderansicht;

Fig. 6

einen Schnitt nach der Linie VI-VI in Fig. 5;

Fig. 7

eine vergrößerte Darstellung einer weiteren Ausführungsmöglichkeit der Druckeinheit im Schnitt;

Fig. 8

eine weitere Ausführungsmöglichkeit der Erfindung in Vorderansicht;

Fig. 9

einen Schnitt nach der Linie IX-IX in Fig. 8;

Fig. 10

eine einzelne Darstellung einer Druckeinheit im Schnitt;

Fig. 11

eine weitere Ausführungsform der Erfindung in Vorderansicht;

Fig. 12

einen Schnitt nach der Linie XII-XII in Fig. 11;

Fig. 13

einen Schnitt nach der Linie XIII-XIII nach Fig. 11;

Fig. 14

eine weitere Ausführungsmöglichkeit des Druckelements in schematischer Vorderansicht;

Fig. 15

das Druckelement nach Fig. 14 in schematischer Seitenansicht;

Fig. 16

eine weitere Ausführungsvariante der Gestaltung des Druckelements in schematischer Vorderansicht;

Fig. 17

eine weitere Ausführungsform der Erfindung in schematischer Vorderansicht;

Fig. 18

einen Schnitt nach der Linie XVIII-XVIII in Fig. 17;

Fig. 19

eine schematische Seitenansicht einer Fördereinrichtung mit Kette;

Fig. 20

einen Schnitt nach der Linie XX-XX in Fig. 21;

Fig. 21

eine Draufsicht auf die Ausführungsform nach Fig. 20 mit Heizeinrichtung;

Fig. 22

eine Draufsicht auf die beweglichen Druckelemente;

Fig. 23

ein Detail von Fig. 22.

The invention is described below with reference to exemplary embodiments shown in the drawing. The drawing shows:

Fig. 1

is a schematic side view of an embodiment of the invention;

Fig. 2

a section along the line II-II in Fig. 1;

Fig. 3

an enlarged view of a first embodiment of the pressure element in a schematic side view in the direction of arrow III-III of FIG. 2;

Fig. 4

a further embodiment of the design of the intermediate joint in an embodiment according to FIG. 3;

Fig. 5

a further embodiment of the invention in a schematic front view;

Fig. 6

a section along the line VI-VI in Fig. 5;

Fig. 7

an enlarged view of another embodiment of the printing unit in section;

Fig. 8

a further embodiment of the invention in front view;

Fig. 9

a section along the line IX-IX in Fig. 8;

Fig. 10

a single representation of a printing unit in section;

Fig. 11

a further embodiment of the invention in front view;

Fig. 12

a section along the line XII-XII in Fig. 11;

Fig. 13

a section along the line XIII-XIII of FIG. 11;

Fig. 14

a further embodiment of the pressure element in a schematic front view;

Fig. 15

14 in a schematic side view;

Fig. 16

a further embodiment variant of the design of the pressure element in a schematic front view;

Fig. 17

a further embodiment of the invention in a schematic front view;

Fig. 18

a section along the line XVIII-XVIII in Fig. 17;

Fig. 19

a schematic side view of a conveyor with chain;

Fig. 20

a section along the line XX-XX in Fig. 21;

Fig. 21

a plan view of the embodiment of Figure 20 with heating.

Fig. 22

a plan view of the movable pressure elements;

Fig. 23

a detail of Fig. 22.

In Fig. 1 is a schematic side view of a heating device 1 for a corrugated cardboard system shown. There are several, in the conveying direction of a corrugated cardboard web 2 successive heating plates 3 application, above which for example, an endless conveyor belt 4 runs over rollers 80, 81 and 82. The Lower strand 4.1 of this conveyor belt 4 presses against the surface of the corrugated cardboard web 2. The corrugated cardboard web 2 can consist of a one-sided corrugated cardboard layer 2.1, another one-sided corrugated cardboard layer 2.2 and a cover sheet 2.3 put together.

Furthermore, printing units 5 are provided, which according to FIGS. 2 and 3 in one first embodiment each from a transverse to the conveying direction of the corrugated cardboard web Order 2 arranged bearings, the top of the lower strand 4.1 of the conveyor belt 4 acting pressure element 7 is attached.

As can be seen in particular from FIG. 3, the pressure element 7 is freely movable only connected to the bearing 6 via at least one elastic medium 11. 3 as elastic Medium compression springs 11 application, which is on the one hand on the bottom of the bearing 6 and on the other hand support on the top of the pressure element 7. As a result, this pressure element 7 against the lower strand 4.1 of the Conveyor belt 4 pressed, which in turn the corrugated cardboard 2 over the entire surface acted upon. The compression springs 11 are caused by the weight of the bearing 6 loads and transmit this weight to the pressure element 7.

2, a plurality of pressure elements 7 can be arranged next to one another and preferably be coupled to one another on a common bearing 6.

2 further shows that the bearing 6 on both sides of the corrugated cardboard web 2 in the plane of the upper side of the conveyor belt 4.1 on the machine frame 10 or articulated on side supports 47 (see FIGS. 8 and 9). This Linkage is shown in more detail in Fig. 3: The bearing 6 is laterally with a linkage lever 6.1 connected, which via a joint 13.1 to an intermediate lever 14, another joint 13.2 and a lever, not specified, e.g. is attached to the machine frame 10.

2, the bearing 6 in the vertical direction by an external lifting device, e.g. by pneumatic cylinder 65, i.e. by means of the cylinders 65, the pressure elements 7 can be loaded via bearings 6 and compression springs 11 or be relieved.

Instead of the embodiment shown in FIG. 3, there is also according to FIG Possibility of two intermediate levers 14 'and 14' 'and corresponding intermediate joints 13.1, 13.2, 13.3 and 13.4.

It can be seen in particular from FIG. 3 that according to a first exemplary embodiment the pressure element 7 encloses the bearing 6 and has a rectangular shape. The bearing 6 is between the top and bottom spring pairs 11 and 21 of the Pressure element 7 clamped.

weicher" als die Federn 11; sie dienen lediglich dazu, beim Anheben des Lagers 6 den Stoß dieses Lagers gegen die Druckelemente 7 abzufangen; sie haben damit eine Art Stoßdämpferfunktion.The springs 21 are

softer "than the springs 11; they only serve to absorb the impact of this bearing against the pressure elements 7 when the bearing 6 is raised; they thus have a kind of shock absorber function.

It can also be seen from FIG. 3 that the bearing 6 with the pressure element 7 shock elements 24 which can be acted upon on the inside is connected. These bumpers 24 are preferably located near the area of the horizontal plane between the top of the lower conveyor belt 4.1 and the bottom of the pressure element 7 and are thus able to withstand frictional forces from the pressure element 7 to take over. They are advantageously close to the friction surface, to also minimize unwanted torques of the pressure element 7 or to avoid and are arranged in a plate 25 which is connected to the bearing 6 is screwed.

As can be seen from Fig. 3, the vertical plane of a resultant force set back against the geometric center of the pressure element 7 against the running direction L of the corrugated cardboard web 2. The right push element is thus located 24 not on the inside of the pressure elements 7, while the left Shock element 24 acts on the inside of the pressure elements 7. The whole The arrangement is designed so that any tendency of the pressure element 7 to tip over, for example because of an unexpected increase in friction.

It can also be seen from FIG. 3 that the spring pairs 21 on the upper side each stop screws 27 passing through the pressure element 7. This will result in a possible undesired vertical movement of the pressure element 7 avoided over a longer distance. This is at least for that Printing elements 7 required, which outside the minimum working width Corrugated cardboard web 2. When setting the operating conditions of an entire Printing unit is placed on a flat surface, for example the Heating surface, and the bearings 6 are loaded similar to the operating state. On this ensures that the printing elements in the aforementioned Do not apply pressure to areas.

The above-mentioned upper springs 21 serve the bearing 6 approximately in the middle Clamp area of the pressure element 7. These pressure elements 7 are perfect free and can lay down on the top of the lower strand 4.1.

From Fig. 3 it can also be seen that there is also the possibility that To apply a piston rod 65 to bearing 6 via a piston-cylinder unit, so that in addition to the dead weight and the springs 11 another controlled pressure can be applied to the corrugated cardboard web 2. Hereby it is possible to set the desired pressure values of the printing elements 7 accordingly adjust. By interacting with those shown in Figs. 2, 3 and 4 Intermediate levers 14 or 14 'or 14' 'and the joints 13.1 to 13.4, which is approximately in the plane of the frictional forces between the pressure element 7 and the lower conveyor belt 4.1 must be positioned, there is a good one Stability of the entire system.

In the embodiment of the invention shown in FIGS. 5 and 6, there is Possibility of 2 lying one behind the other in the conveying direction of the corrugated cardboard web bearings 6 each provided with at least one pressure element 7 on both sides via links 16.1, 16.2, 16.3 and 16.4 of one articulated on the machine frame 10 Chain 15 are interconnected. 6, in particular, that here bolt 18 of the chain 15 each in a clamping piece 19 of the respective bearing 6 are clamped.

5, the chain 15 can also each in a guide 20 of the machine frame 10 be guided. From Fig. 5 it can also be seen that the Chain 15 at least one angular element which can be acted upon by a lifting element 22 23, wherein the lifting element 22 is attached to the machine frame 10 is. This makes it possible to use the lifting element 22 and the angle element 23 to raise the bearing 6 with the pressure elements 7 or functionally set against the corrugated cardboard web 2.

From Fig. 6 it can also be seen that between the top of the Bearing 6 and the underside of the pressure element 7 there is a separating layer 28, which serves as thermal insulation, e.g. in the form of thermal or mineral wadding. Here, too, analogously to the embodiment according to FIG. 3 Stop elements 27 are used to ensure that the entire unit functions correctly to adjust and / or secure against unwanted movement.

The stop elements 27 have the same function as the springs 21 in FIG. 3. They can be designed as screws with an elastic pressure piece installed on the inside be.

It can be seen from the exemplary embodiment according to FIG. 7 that the impact elements 24 are arranged in a plate 25 analogously to the embodiment according to FIG. 3, which in turn is penetrated by the lower springs 11. This plate 25 is attached to the underside of the bearing 6 by screws. Are above again stop elements 27, so that also in this embodiment the pressure element 7 freely movable only via the springs 11 and the elastic Stop elements 27 is connected to the bearing 6.

In the middle of the bearing 6 - each between two pressure elements 7 - there axial stops 24 ', which the movement of the pressure elements 7 in the longitudinal direction of bearing 6, i.e. transverse to the direction of corrugated cardboard. These stops 24 'are provided in various embodiments (see Figures 2, 3, 5, 6, 7, 8 and 10).

In the aforementioned exemplary embodiments, the pressure element 7, which is preferably rectangular, the bearing 6 or there are several Pressure elements 7 are provided.

In another embodiment of the invention, there is also according to FIG Possibility that the pressure element 7 'C-shaped and horizontal over at least one elastic medium, for example the two springs 11 free is movably arranged on the underside of the bearing 6. Again one finds on the underside of the bearing 6 intermediate plate 25 'application, which the thrust elements 24 in accordance with the embodiment of FIG. 3.

In the plate 25 'there are stop elements 27', which the movement limit.

8 and 9 find several pressure elements 7 'according to FIG. 10 application. In this embodiment, according to FIG. 9 bearing 6 via intermediate levers 43, 44, 45 and 46 on two side supports 47 attached, which in turn extending across the corrugated cardboard web 2 Traverse 50 are firmly connected. This will have the same effect causes, as in the embodiment of Fig. 3 or Fig. 4, so that ensures is that the pressure elements 7 'functionally via the lower strand 4.1 Apply corrugated cardboard web 2 to the entire surface.

From Fig. 8 it can be seen that the cross member 50 on each side via a lifting device 51, consisting of a support and e.g. an air bellows cylinder 80, on Machine frame 10 is attached. A complete section with several load units, which each consist of e.g. three bearings 6 and the associated Pressure elements 7 'exist, is suspended on two cross members 50.

The lifting devices 51 offer the possibility of moving the traverses 50 around about 150 to 200 mm and thus a section with the carrier 47 e.g. 10 load units, each with three bearings 6 from the corrugated cardboard web take off and take it out of operation. This is e.g. necessary for machine stops, for cleaning purposes or for inspection of the heating surface.

In contrast, the lifting units, each with a bracket 49 and one Lift cylinder 65, a single load unit with three bearings 6, which are connected to one another via two plates 43.

This enables a fine adjustment of up to approx. 35 mm for a single load layer or decommissioning one or more individual load units possible for the purpose of lower heat transfer.

11, 12 and 13 are the C-shaped pressure elements 7 '' designed so that they are longer in the respective edge area than the pressure elements 7 'in the central region. It can also be seen that the pressure elements 7 '' are spaced-apart recesses 55 or 55 ', which either from above (Fig. 12) or fully below (Fig. 13) are incorporated into the respective C-shaped pressure elements 7 ″. Hereby is a very good adaptation of the respective pressure elements 7 'or 7' ' ensures the pressure zones of the lower run 4.1 of the conveyor belt 4, whereby overall a uniform pressure distribution on the corrugated cardboard web to be processed 2 is achieved. It results from the particularly elastic Pressure elements 7 '' overall a good adaptation to the particular circumstances.

This elasticity is particularly important for smaller working widths when in no corrugated cardboard runs through the outer area and the lower run 4.1 directly on the heating plate 3 rests. If you drive without a conveyor belt, you absolutely have to avoid the edge of the corrugated web with an edge of a pressure element meets so that the cardboard edge is not damaged.

14, 15 and 16 there is also a further embodiment of the invention the possibility that the respective pressure elements 7 '' have recesses on the upper side 56 and each in the end region through lateral strips 54 Piston cylinder units 58 can be raised and lowered. These piston cylinder units 58 are attached to the machine frame 10 and can be used via the respective Piston rods act on the underside of the lateral strips 54 and thus the Transfer printing elements 7 ″ into an idle state or into an operating state. Again, compression springs are analogous to the aforementioned embodiments 11 are provided, which are supported on the bearings 6, not shown, so that in this embodiment the respective pressure elements 7 '' freely movable only via the springs 11 on the respective bearing 6 are.

This embodiment is above all then an advantage when using corrugated cardboard many different working widths.

17 and 18, a spring leaf 73 is used, which over the entire pressure width on the inner surface of the pressure element 7 'lies. This spring leaf 73 is via a plate 74 and fasteners attached to the bearing 6 and in turn is acted upon by the aforementioned springs 11. In this case, the springs 11 press on the spring leaf 73 and not against the pressure element 7 '. Again, push elements 24 'are provided, and analogous to the aforementioned embodiments. This variant is also suitable especially for corrugated cardboard webs with large width differences.

19 there is also the possibility that the pressure elements 7 'and Bearing 6 are attached to at least one rotating conveyor chain 57. There are preferably two parallel conveyor chains 57 on both machine sides which run over sprockets 61 and 61 ', for example the sprocket 61 can be driven. This is also in this embodiment respective pressure element 7 'C-shaped and, for example, analogous to 10 designed embodiment.

The conveyor chain 57 can be moved back and forth to avoid that unwanted residues are deposited. The circulating conveyor chain 57 can also be equipped with pressure elements 7 'over its entire length where, e.g. indirect heating in the area of the upper run the pressure elements 7 'can be carried out.

20 and 21 there is also the possibility that a pressure element 7 '' ' Application, which is equipped with heating. In this case again finds an intermediate plate 25 '' according to FIG the bottom of the bearing 6 is attached. Springs 11 are supported on the one hand Bearing 6 and on the other hand act on the pressure element 7 '' '. This pressure element 7 '' 'is held in position via spacer elements 32 such that it analogous to the aforementioned embodiments, again freely movable relative to one another the camp 6.

As can be seen in particular from FIG. 21, the pressure element 7 '' 'can be longitudinal and have transverse bores 68 and 68 ', which are elastic Hoses 71 or pipes with at least one heating medium source, not shown connected is. In this embodiment, the pressure element 7 '' 'thicker than in the aforementioned embodiments, in order to accommodate to offer for the holes 68 and 68 '. This embodiment can be used for example in corrugated cardboard double-double to the top cover sheet of the bottom one-sided corrugated layer heat the bond with the second one-sided corrugated cardboard layer.

In any case, a printing unit 5, consisting of bearings 6 and several Pressure elements 7 or 7 'or 7' 'or 7' '', which are a good fit guaranteed to the corrugated cardboard web 2 to be processed and no negative Exerts forces on the aforementioned path. This makes it easy achieved a significant improvement in quality.

In all the embodiments described so far, e.g. 8 and 9 are the pressure elements 7 'stationary, i.e. always in the same position on the heating surface arranged. 22 and 23, a design is shown in which the Pressure elements are displaceable on the heating surface.

22 and 23 (as a detail from FIG. 22) show a top view of the movable ones Pressure elements. The starting position 72 of the printing elements is solid Lines shown. During operation, there were a few Time in the spaces 74 between the printing elements dust, paper fibers, Residues of glue and dirt. Another disadvantage is the uneven Frictional wear of the heating plates because the gaps 74 are not under pressure are acted on and therefore wear less.

To solve this problem, e.g. in the embodiment according to FIG. 8 and 9 the beams 47 are no longer firmly connected to the crossmember 50, but via not shown, swinging intermediate lever. The carriers 47 are so suspended on the traverse 50.

The entire oscillating pressure system is shown as frame 75 in FIG. 22 shown. A lifting system or an adjustment mechanism 76 (e.g. a hydraulic or pneumatic cylinder) moves the pressure system with the frame 75 in Direction 77 there and back periodically. The pressure elements 7 'are thus between the position 72 and the dot-dash position 73 shown periodically moved back and forth. This measure ensures that there are no residues can deposit and that the surface of the heating plate wears evenly and therefore stays flat.

Claims (37)

Heating device (1) for a corrugated cardboard plant, with several heating plates (3) lying one behind the other in the conveying direction of a corrugated cardboard web (2) and at least one printing unit (5), consisting of a bearing (6) arranged transversely to the conveying direction of the corrugated cardboard web (2), on which at least a pressure element (7) is attached,
characterized, that the pressure element (7, 7 ', 7'',7''') is freely movably connected to the bearing (6) only via at least one elastic medium (11), and that the bearing (6) rests freely on the pressure element (7, 7 ', 7'',7''') via the elastic medium (11) with its own weight. Heating device according to claim 1, with an endless conveyor belt (4), the lower run (4.1) of which presses against the surface of the corrugated cardboard web (2), at least one of the upper side of the lower run (4.1) of the conveyor belt (4) on the bearing (6) pressure element is attached,
characterized, that the pressure elements (7, 7 ', 7'',7''') act either on the conveyor belt (4) or directly on the corrugated cardboard web (2). Device according to claim 1 or 2,
characterized, that the bearing (6) is articulated on both sides of the corrugated cardboard web (2) in the plane of the front belt top of the lower run (4.1) on the machine frame (10). Device according to claim 3,
marked by at least one intermediate joint (13.1, 13.2, 13.3, 13.4) and at least one intermediate lever (14, 14 ', 14'') between the bearing (6) and the machine frame (10) (Fig. 3, 4). Device according to claim 4,
characterized, that in the conveying direction of the corrugated cardboard web (2) one behind the other, each provided with at least one pressure element (7), bearings (6) are connected on both sides via links (16.1, 16.2, 16.3, 16.4) of a chain (15) articulated on the machine frame (10) (Fig. 5, 6). Device according to claim 5,
characterized, that bolts (18) of the chain (15) are each clamped in a clamping piece (19) of the respective bearing (6) (Fig. 6). Apparatus according to claim 4 and 5,
characterized, that the chain (15) is guided in a guide (20) of the machine frame (10). Device according to claims 5 to 7,
characterized, that the chain (15) has at least one angled element (23) which can be loaded by a machine frame (Fig. 5). Device according to claims 1 to 3,
characterized, that the elastic medium between the bearing (6) and the pressure element (7, 7 ', 7'',7''') is at least one spring (11) or at least one rubber element which defines the freely movable pressure element (7, 7 ', 7 '', 7 ''') evenly applied. Device according to one or more of the preceding claims,
characterized, that the pressure element (7) encloses the bearing (6) (Fig. 2, 3, 6, 7). Apparatus according to claim 10,
characterized, that the bearing (6) is clamped between the top and bottom pairs of springs (11; 21) of the pressure element (7) (Fig. 3). Device according to one or more of the preceding claims,
characterized, that the bearing (6) is connected to the pressure element (7) on the inside to be impact elements (24). Device according to claim 12,
characterized, that the impact elements (24) are each close to the area of the horizontal plane between the upper side of the lower conveyor belt (4.1) and the lower side of the pressure element (7, 7 ', 7'',7'''). Device according to claims 12 and 13,
characterized, that the push elements (24) are arranged in a plate (25) fastened on the underside of the bearing (6). Device according to claims 11 and 14,
characterized, that the underside pairs of springs (11) each penetrate the plate (25). Device according to claim 11 to 15,
characterized, that the spring pairs (21) on the upper side each surround the stop screws (27) passing through the pressure element (7) (FIG. 3). Apparatus according to claim 10 and 12 to 15,
characterized, that there is a separating layer (28) between the top of the bearing (6) and the bottom of the pressure element (7), which serves as thermal insulation. Device according to claims 11 to 15,
characterized, that resilient stop pieces (27) pass through the pressure element (7) on the top and act on the bearing (6) on the face (FIG. 7). Device according to one or more of the preceding claims 1 to 9,
characterized, that the pressure element (7 ', 7'',7''') is C-shaped and is horizontally movable on the underside of the bearing (6) via at least one elastic medium (11) (Fig. 10). Apparatus according to claim 12, 13 and 19,
characterized, that between the pressure element (7 ', 7'') and the underside of the bearing (6) there is an intermediate plate (25') which supports the impact elements (24 '). Device according to claims 19 and 20,
characterized, that the bearing (6) is fastened in each case via intermediate levers (43, 44, 45, 46) and side supports (47) to a crossmember (50) extending transversely over the corrugated cardboard web (2) (FIGS. 8, 9). Device according to claim 21,
characterized, that the crossmember (50) is attached to the machine frame (10) by at least one piston-cylinder unit (51). Device according to claims 21 and 22,
characterized, that a lifting unit (49) with limiting elements (48) is arranged between the intermediate lever (47) connected to the crossbar (50) and the respective bearing (6) (FIG. 9). Device according to claims 19 to 23,
characterized, that the C-shaped pressure elements (7 '') have a greater length in the respective edge region and recesses (55, 55 ') which are spaced apart from one another (FIGS. 11 to 13). Device according to claim 24,
characterized, that the cutouts (55, 55 ') partially extend from above and / or from below through the pressure elements (7''). Device according to claims 19 and 20,
characterized, that the pressure element (7 ') has recesses (56) on the top and can be raised and lowered in the end region via lateral strips (54) and via piston-cylinder units (58) arranged on the machine frame (10) (FIGS. 14 to 16). Device according to claims 19 and 20,
characterized, that a spring leaf (73) lies over the entire pressure width on the inner surface of the pressure element (7 ') (FIGS. 17, 18). Device according to claim 27,
characterized, that the spring leaf (73) is fastened in the pressure element (7 ') via a plate (74) and fastening means (75). Device according to one or more of the preceding claims,
characterized, that the pressure elements (7 ') and bearings (6) are attached to at least one revolving conveyor chain (57) (Fig. 19). Device according to claim 29,
marked by two chain wheels (61, 61 ') which cooperate with the conveyor chain (57) and are arranged at a distance from one another. Device according to one or more of the preceding claims,
characterized, that the pressure element (7 ''') is equipped with heating (Fig. 20, 21). Apparatus according to claim 31,
characterized, that the pressure element (7 ''') has longitudinal and transverse bores (68, 68') which are connected to at least one heating medium source via elastic hoses (71) or pipes. Device according to one or more of the preceding claims,
characterized, that the bearing (6) is connected to at least one lifting and lowering piston-cylinder unit (65). Device according to one or more of the preceding claims,
characterized, that the printing unit (5) acts against an upper heating or supporting surface on the corrugated cardboard web (2). Device according to one or more of the preceding claims,
characterized, that the carriers (47) are suspended from the crossbar (50) in a pendulum manner and are connected to a frame (75) (FIGS. 22, 23). Apparatus according to claim 35,
characterized, that the frame (75) is connected to a lifting system (76). Device according to one or more of the preceding claims which as a pressure system via the printing unit both in a heating section can also be used in a train section of a corrugated pasting machine is.

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