DE202015102400U1 - Continuously working press - Google Patents

Abstract

Continuous press for the production of wood-based or plastic plates, in particular fiber or chipboard, with several in the press longitudinal direction successively lined press frame within which supported against the press racks support heating plates (10, 16), wherein the press racks, the free longitudinal expansion or shrinkage the heating plates (10, 16) follow, forming a movement joint via sliding bodies (17) are mounted on lower supports (8), characterized in that the sliding body (17) of a movement joint between the sliding body (17) and support (8) sealing gasket (21) are surrounded.

Description

The invention relates to a continuously operating press for the production of wood-based or plastic plates, in particular fiber or chipboard, with several in the press longitudinal direction successively arranged press racks through which supported against the press racks supported heating plates in the press longitudinal direction, wherein the press racks for free longitudinal expansion or shrinkage the heating plates are mounted to form a movement joint via sliding on lower supports.

Such continuous presses, such as those from the DE 196 22 204 or the DE 44 00 347 are also known, have the pressing pressure transmitting and the pressed material pulling through the press, flexible, endless steel belts, which are guided by drive drums and pulleys to Oberjoche and Unterjoche the press racks. The thereby forming between the steel strips press nip is usually hydraulically adjustable.

The necessary pressing pressure is applied by cylinder piston units, which are arranged to apply the pressing pressure between the heating plates and the press racks on the heating plates on the steel strips, wherein between the heating plates and the endless steel belts with the steel bands mitumlaufende, with their axes transversely to the strip running direction rolling support elements are provided. In such presses, previously glued particles are shaped into plates under pressure and heat, the heat being of particular importance for the setting reaction of the glue.

Since such presses are used for the production of plates of different thickness and consistency of the material to be pressed, the heating plates are set to different, each specifically selected temperatures. These different temperatures at different products as well as a change in the temperature profile of the heating plates by heat input or heat discharge during the operation of the press requires a corresponding expansion or shrinkage of these heating plates.

These expansions or shrinkages can cause damage in a positive connection between the heating plate and the press frame, e.g. on the seals of the cylinder piston units mentioned above. But even guides or insulating the heating plates can be damaged by appropriate movements accordingly.

In order to compensate for the corresponding forces by thermal expansion or shrinkage of the heating plate on the press frame or its components such as pressure cylinders or insulating, it has been proposed that the press racks follow these movements. To make this possible, the joint between the press racks and the carriers on which the press racks are mounted, was designed as a movement joint and it was then provided at this point corresponding sliding body.

However, it has then been found that dirt particles accumulated on the underlying carriers and were then introduced into the movement joint between press racks and carrier and then due to stick-slip effects to disorders, for example. in the form of vibrations in the sliding movement of the individual press racks led.

In order to avoid such stick-slip effects, the press racks were then mounted at their lower end in the region of the movement joint on rollers instead of sliding bodies. However, these rollers have the disadvantage of high Hertzian pressure between them and the carriers carrying them with the press racks.

To avoid this, one can as in the DE 196 22 279 A1 proposed to replace such roles by segments of rolling wheels, which have a larger rolling radius. Thus, the Hertzian pressure can be significantly reduced.

However, the production of corresponding Rollradsegmente is relatively expensive and their assembly requires a high precision in order to achieve the desired effect can.

The object of the present invention is thus to further develop a continuously operating press as described above in such a way that it has a simpler but nevertheless reliable construction in which the press racks can easily follow the thermally induced change in length of heating plates guided in them.

This object is achieved in that between the press frame and the carrier a seal is provided which surrounds the slider and seals the movement joint formed between the slider and the carrier.

As press racks are in this context not only modular press frames, but also press frame, in particular one-piece press frame to understand.

The invention is based on the finding that the above-mentioned stick-slip effect is essentially caused by the contamination of the sliding surfaces in the movement joint and that by avoiding the corresponding pollution already a more significant reduction of this problem can be achieved. In this case, a corresponding seal is inexpensive to realize. A costly production of Rollradsegmenten etc. can be avoided.

In order to ensure the tightness of the construction, even under harsh operating conditions, it is proposed to install the seal on the press frame in the direction of the spring-biased spring. Thus, a tightness can be ensured even over longer periods.

It is assumed that the intended seal and the sliding body, which surrounds, are subject to a corresponding wear. In order to be able to ensure a permanently safe function here, it is therefore proposed that the seal is interchangeable with the sliding body as a component. This facilitates maintenance of the press, since the replacement of a corresponding component faster and therefore less expensive to implement than the corresponding exchange of several items.

To minimize wear of the slider, it can cooperate with a slide rail mounted on the carrier. The movement joint is thus laid on the carrier facing away, in particular the upper side of the slide rail.

Such a slide is to be adapted in their material properties specifically to the slider, while the specific, resulting from the environment of the site boundary conditions can be taken into account.

To be regarded as particularly advantageous in this case is that because of the provision of a separate slide, on the top of the movement joint between press frame and carrier runs, the carrier can be made of a simple structural steel, without that in this particular material properties in terms of suitability for sliding interaction with the slider would have to be respected.

Now it is the case that e.g. due to steering movements of the endless steel belts or due to inclinations of rolling with the steel belts rolling supporting elements, the press racks are also exposed to lateral forces acting on them.

In a particularly preferred embodiment, a slide as mentioned can also be used to cooperate on their side with at least one guide element on the press frame to absorb in this way the mentioned transverse forces and to counteract an undesirable transverse movement of the press frames can.

A corresponding press frame is thus precise to perform and it is not necessary to provide the carrier separately with a corresponding guide costly, since a corresponding leadership function is taken over by the component of the slide.

It should be noted that such a guide is provided in the transverse direction only on one side of the press frame, while the other sliding surface is carried out in the transverse direction not as a fixed, but as a floating bearing in order to enable in this direction temperature expansions of the press frame, without tension to provoke. Thus, the movements resulting from thermal changes of the continuously operating press are altogether directed and can, for example, be deliberately taken into account in settings of the press.

In a further preferred embodiment of the invention, the transverse guide is realized on the fixed bearing side in particular by two mutually parallel slide rails, which form a guide between them for the guide element on the press frame.

Such a construction has the advantage that in the manufacture of the press frame whose machining, in order to ensure a corresponding precision can be relatively low. Also, the carrier is under this aspect, only slightly edit. The majority of the necessary machining can ultimately be carried out on the slide or slides, which are to be regarded as easy-to-use components.

For the guide element, in particular the use of a feather key is proposed, since hereby a reliable operation is possible in a simple manner.

Further advantages and features of the invention will become apparent from the following description of an embodiment. Showing:

1 a front view of a press frame

2 a side view of a portion of the press with three adjacent press racks

3 a section through the storage of a press frame according to 1 on a support beam

In 1 one recognizes a press frame of a continuously operating press in the front view. The press frame has an upper yoke 1 and a lower yoke 2 , The Oberjoch 1 and the lower yoke 2 are over tie rods 3 connected with each other.

The tie rods 3 are about bolts 4 at the lower yoke 2 and about bolts 5 at the Oberjoch 1 coupled.

The Oberjoch 1 is supported by sliding shoes 6 on two headrests 7 the continuous press in the transverse direction, while the entire press frame down on two carriers 8th gets up.

The pressure generated by the press is inside the press frame by hydraulic cylinders 9 produced at the Oberjoch 1 are attached and down on an upper hot plate 10 to press. The one by the hydraulic cylinders 9 generated pressure is from the upper heating plate 10 about rolling on her support elements 11 on a circulating endless steel band 12 transferred with a parallel steel belt 13 the pressed material 14 through the between the two steel bands 12 . 13 lying press nip of the press pulls.

Also the parallel steel band 13 is about mitumlaufende, with their axes transverse to the direction of tape travel 24 guided support elements 15 supported on a lower heating plate 16 roll.

The through the heating plates 15 and 16 produced temperature causes in the press nip a setting of the pressed material 14 contained glue.

The bottom heating plate 16 rests on the lower yoke 2 from that forms an abutment for those of the hydraulic cylinders 9 applied pressing force.

In the 2 is a section of a press with several juxtaposed press racks according to 1 shown in the side view.

It can be seen that both the Oberjoch 1 from two plates 25 . 26 as well as the lower yoke 2 from two parallel plates 27 . 28 exists and that also the tie rods 3 as two parallel plate-like elements 29 . 30 are formed.

At the two plates 25 . 26 that the Oberjoch 1 form, are the impression cylinder 9 attached. You press the upper heating plate 10 downward.

Due to temperature differences in the operation of the continuous press shrink or expand the heating plates 10 . 16 in their length, in particular in the direction of tape travel 24 out. To compensate for these changes in length, they are supporting press racks on the carriers 8th displaceable. The shift direction is normal to the drawing plane of the 1 respectively. 3 ,

So that the movement of the lower yoke 2 on the carrier 8th As evenly as possible, is on the press frame on each plate 27 . 28 of the lower yoke 2 a slider 17 appropriate in the in the 3 detailed example shown in each case on a foot plate 18 every plate 27 . 28 of the lower yoke 2 is fixed. An appropriate fixation can be achieved via screws, gluing or else via a force or a positive connection.

The slider 17 slides on a slide rail 19 on the carrier 8th is mounted on the top thereof, in the example shown here in a holder 20 lies. Between the slider 17 and the slide rail 19 is thus the movement joint between press frame and carrier

It has been found that by impurities sliding the slider 17 on the slide rail 19 becomes uneven and a stick-slip effect develops, which leads to a displacement of the press frame to its vibration. In order to prevent a corresponding contamination, in the example shown here is a seal 21 provided the slider 17 surrounds and between the foot plate 18 and the slide rail 19 on the carrier 8th is arranged. This seal 21 is formed so that it is resiliently biased on the surface of the slide rail 19 pushes and thus the movement joint located there between the slider 17 and the slide rail 19 seals to the outside and prevents the ingress of dirt in this joint. This gap forms the movement joint between the press frame on which the slider 17 About Habefestigt is, and the carrier 8th to which the slide rail 19 is attached.

It is envisaged that the slider 17 and the seal 21 as components directly with the foot plate 18 are connected, so that when a maintenance of the press, such a component is replaceable as a complete part.

In the example shown here, the footplate is used to reduce the specific surface pressures 18 , the sliding body 17 and the slide rail 19 double exists and it is also for the second sliding 17 a seal 21 provided, which surrounds him and the movement joint between sliding body 17 and slide rail 19 seals and protects against dirt.

By the provision of two parallel slide rails 19 both on the bracket 20 are fixed, is between the slide rails 19 a guide groove 22 educated. In this leadership 22 is in the example shown here a feather present as a guide element 23 with a plate 27 . 28 of the lower yoke 2 the press frame is connected. About this guide element 23 , formed as a feather key, thus a lateral slipping of the press frame (parallel to the plane of the 1 respectively. 3 ) be prevented.

It should be noted that such a guide element 23 as the key is provided only on one side of a press frame, as in the 1 is shown on the left. Thus, a fixed bearing is realized on this side with respect to a transverse movement of the press frame, while on the other side of the press frame, on which no such guide element 23 is provided, a floating bearing is realized. In the 1 this floating bearing is shown on the right side. Due to this design with fixed and with floating bearing thermal expansions of the press frame can be transverse to the direction of tape travel 24 do not lead to tension of storage.

As material for the sliding bodies 17 For example, sintered material made of bronze with embedded graphite or PTFE particles can be provided. As material for the slide rail 19 In particular, ground steel or stainless chromium-nickel steel is proposed.

At the seals 21 In particular, plastic moldings are proposed, preferably made of ultra-high molecular weight polyethylene.

LIST OF REFERENCE NUMBERS

1

 Oberjoch

2

 Unterjoch

3

 tie rods

4

 bolt

5

 bolt

6

 skids

7

 endcarriages

8th

 carrier

9

 hydraulic cylinders

10

 heating plate

11

 support element

12

 steel strip

13

 steel strip

14

 pressed material

15

 support element

16

 heating plate

17

 sliding

18

 footplate

19

 slide

20

 bracket

21

 poetry

22

 guide

23

 guide element

24

 Tape direction

25

 plate

26

 plate

27

 plate

28

 plate

29

 element

30

 element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19622204 [0002]
• DE 4400347 [0002]
• DE 19622279 A1 [0009]

Claims (7)

Continuous press for the production of wood-based or plastic boards, in particular fiber or chipboard, with several in the press longitudinal direction successively lined press frame, within which opposite the press racks supported heating plates ( 10 . 16 ), wherein the press racks, the free longitudinal expansion or shrinkage of the heating plates ( 10 . 16 ), with the formation of a movement joint via sliding bodies ( 17 ) on lower supports ( 8th ), characterized in that the sliding bodies ( 17 ) of a movement joint between sliding body ( 17 ) and supports ( 8th ) sealing gasket ( 21 ) are surrounded. Press according to claim 1, characterized in that the seal ( 21 ) on the press frame direction carrier ( 8th ) is installed resiliently biased. Press according to one or more of the preceding claims, characterized in that the seal ( 21 ) together with the slider ( 17 ) is exchangeable as a component. Press according to one or more of the preceding claims, characterized in that the sliding body ( 17 ) with one on the support ( 8th ) fixed slide rail ( 19 ) cooperates, wherein the movement joint between sliding body ( 17 ) and slide rail ( 19 ) lies. Press according to claim 4, characterized in that the slide rail ( 17 ) with at least one guide element ( 23 ) in transverse to the direction of tape travel ( 24 ) cooperates on the press frame. Press according to claim 5, characterized in that two parallel running slides ( 19 ) a guide groove ( 22 ) between themselves for the guide element ( 23 ). Press according to one or more of the preceding claims, characterized in that the guide element ( 23 ) is designed as a feather key.

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