CN107962800B

CN107962800B - Press for the continuous production of material sheets

Info

Publication number: CN107962800B
Application number: CN201710996611.XA
Authority: CN
Inventors: C·韦斯; F·黑曼斯
Original assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Current assignee: Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date: 2016-10-20
Filing date: 2017-10-19
Publication date: 2022-04-15
Anticipated expiration: 2037-10-19
Also published as: CN107962800A; DE102016119955A1; EP3318396A1; EP3318396B1; CN208085035U; DE102016119955B4

Abstract

The invention relates to a press for continuously producing material boards, such as chipboards, fibreboards, plywood or plastic boards, having a flexible endless steel belt which conveys the pressing pressure and pulls the material (24) to be pressed through the press, the steel belt being guided around a press table (10) or a press ram and being supported on press plates (16) mounted on the press table and the press ram by means of running rollers which are guided with their axes transverse to the direction of belt travel. The press is provided with an entry device which is correspondingly mounted in the press transversely to the production direction and has a frame and a shaft which is supported therein and has a gear for guiding the roller bars (28) in an entry region of the press. The invention is characterized in that the shaft is fixedly supported in the frame and at least one adjusting element, preferably a linear adjusting element, is arranged for adjusting the position of the frame.

Description

Press for the continuous production of material sheets

Technical Field

The invention relates to a press for continuously producing material plates.

The invention relates to a press for the continuous production of material panels, such as chipboards, fibreboards, plywood or plastic panels, having a flexible endless steel belt which conveys the pressing pressure and pulls the material to be pressed through the press, is guided around a press table or a press slide and is supported on press plates which are mounted on the press table and the press slide by synchronously operating rollers, the axes of which are guided transversely to the direction of belt travel.

Background

A related press is known from DE 19931176B 4. The endless steel belt is guided at the inlet of the press by guide rollers and at the outlet of the press by drive rollers. For the rough adjustment of the strip run and the final resetting of the strip course, the drive roller axes can be adjusted by means of suitable actuating drives. The press table and the press ram are formed in the press as press supports which are adjacent to one another (connected to one another) and which support the heatable and/or coolable press platen. Endless rollers guided in guide chains are introduced between the steel belt and the press platen, which rollers are supported at the support by the press table and the press ram. The rollers are guided between the pressure plate and the steel strip so as to rotate together. The rods are transferred to the steel strip at the inlet of the press by means of an entry mechanism. The axes of the rolling bars are here oriented substantially orthogonally to the direction of belt travel of the steel belt. However, the entry mechanism allows to bring the axes of the rollers to an inclined position deviating from the vertical for fine adjustment of the strip travel and final resetting of the strip orientation.

Each entry mechanism according to DE 19931176B 4 has a guide shaft equipped with a sprocket for a chain, which guides the roller strip. The guide shaft is mounted on the joint plate so as to be rotatable about the axis of its shaft. The articulation plate can be rotated through a small angle about the central bolt to bring the roller strip into a slightly inclined position relative to the vertical. For the rotational adjustment, a motor-driven eccentric drive is used, which is clamped at both ends of the guide shaft by means of a push-pull rod.

The disadvantage is that the roller is pulled out of or pushed into the guide device provided for guiding the roller merely by a rotational adjustment of the guide shaft. Here, guide plates, guide shoes and others for the roller strip may be involved. A problem is also shown in terms of the rigidity of the guide shaft. In extreme cases, there is the risk of uncontrolled jamming and/or buckling of the roller strip in the guide device. As a result, increased losses and, if possible, uncontrolled entrainment (band offset) result, in particular when the insertion device arranged on the guide shaft is ground flat or warped. For controlling the entry mechanism (Einlaufwerk), a strip direction sensor is provided, which gives contact at the strip edge.

The press has generally proven effective, but can be further improved. In particular, the manufacture of very thin plates can be error prone. In this regard, the steel strips tend to be badly distorted and almost abut against each other in the pressing area. Thereby confounding the contact signal at the edge of the steel strip.

Disclosure of Invention

The object of the invention is to remedy this disadvantage and to improve the guidance of the roller strip in the entry device and to provide a sensor device for controlling the entry device that is precise and sensitive to disturbances.

The press for this purpose is characterized in that the shaft is mounted in a stationary manner in the frame and at least one adjusting element, preferably a linear adjusting element, is arranged for adjusting the position of the frame.

Thereby, the entry mechanism is adjusted as a whole unit, keeping the pitch of the rollers always the same, and preventing one side from jamming.

In a further configuration, at least one further guide device for guiding and/or orienting the roller strip can be arranged at the frame. The guiding means may consist of a guiding plate that follows the angle of containment (contact angle) of the roller strip around the gear.

Preferably, the adjusting element can be arranged at the press and laterally in the steel strip passage direction at the frame, and the frame is connected on the other side at the press by means of a fixing bracket. In order to react to the adjusting effect deviating from the longitudinal center plane of the press, the adjusting element is arranged outside the center of the frame, i.e. in the region of the guide chain arranged at the end of the roller strip.

It is particularly preferred that at least two adjusting elements are arranged at the frame 52 of the entry means 30 on both sides in the direction of passage of the steel strip 18 and correspondingly at the press on the other active side thereof, wherein the entry means 30 is preferably movable along a linear guide. The adjustment of the access mechanism is preferably carried out along a predefined guide along which the linear adjustment element displaces the frame.

As adjusting elements, linear drives, articulated levers, screw drives, direct drives, pneumatic or hydraulic single-acting or double-acting hydraulic cylinders are preferably arranged.

It is particularly preferred that the frame and/or the linear adjustment element should be arranged in an initial position relative to the press, preferably for changing the orientation of the roller strip starting from the initial position.

Alternatively or in combination, this can also be advantageous when the adjustment region of the frame can be adjusted by means of a fixed stop.

Preferably, a sensor device for measuring the thrust forces acting parallel to the axis of the roller strip is arranged in the pressure plate and/or a sensor device for measuring the axial course (offset) of the roller strip is arranged.

It is particularly preferred that the control device or the adjusting device is arranged in operative connection with the sensor device and the linear adjusting element for adjusting the orthogonal entry at the entry mechanism or for adjusting an angle of the control device or the adjusting device which deviates slightly from the orthogonal entry for the roller strip.

Drawings

The invention will be further elucidated on the basis of an embodiment shown in the drawing.

The figures show:

fig. 1 shows a continuously operating press in a schematic side view;

fig. 2 shows the entry mechanism of the press according to fig. 1 as a detail;

FIG. 3 shows a front view of the access mechanism;

fig. 4 shows a detail of the entry mechanism according to fig. 3 in the region of the connection to the press;

fig. 5 shows a section through the press with a perfectly symmetrical intermediate travel of the press steel strip;

FIG. 6 shows a section through the press with the steel strip of the press running symmetrically off center;

fig. 7 shows a schematic top view of the press according to fig. 1, showing the position of the entry mechanism when the rollers enter the press orthogonally and at an angle to the orthogonal entry.

Detailed Description

The continuously operating press shown in fig. 1 has a fixed lower press bed 10 and a movable upper press ram 12. The press table 10 and the press ram 12 are likewise formed by press supports 14 connected to one another, the press supports 14 supporting heatable and/or coolable press plates 16; the latter constitutes the length of the press bed 10 and the press ram 12. The endless steel belt 18 is guided above and below over the press plate 16, the steel belt 18 running at the inlet of the press by means of guide rollers 20 and at the outlet of the press by means of drive rollers 22 and forming a pressing gap for a material 24 to be pressed. The guide rollers 20 and the transmission rollers 22 are provided with an adjusting mechanism by means of which the steel strip 18 can be tensioned and the steel strip travel influenced. This plays a role in the sense of coarse adjustment of the travel of the steel strip. Interposed between the press plate 16 and the steel belt 18 are synchronously running rollers 28 guided at an endless guide chain 26. The rollers 28 thereby form an endless roller blanket 25 for rollingly supporting the steel strip against the press plate 16. Preferably, the roller 28 is connected to the guide chain 26 on both sides by means of a spring rod 27 (see fig. 3).

Fig. 2 shows the inlet device 30 at the inlet of the press in an enlarged view in the upper inlet region. By means of the feed mechanism 30, the rollers 28 are guided and guided by the toothed wheels 36 arranged therein and are introduced into the clamping region between the steel strip 18 and the press plate 16. Generally, the rollers 28 occupy orthogonal positions relative to the direction of belt travel of the steel belt 18. However, with appropriate adjustment of the entry mechanism 30, there is the possibility of deviation from such orthogonality to affect the steel strip travel in the sense of fine adjustment.

The entry means 30 are usually provided with further, merely outlined, guide devices 38 for the rollers 28. Here, guide plates, guide shoes and others may be involved.

Fig. 3 shows a schematic front view of an access mechanism 30, which is preferably mounted on the press stand 14.

In the entry mechanism 30, the guide chain 26 travels outside the roller strip 28 by a sprocket 32, the sprocket 32 being arranged at the end of a guide shaft 34. Between the sprockets 32, the shaft 34 is equipped with a gear 36, and the roller bars 28 are located in the teeth of the gear 36 to be oriented accordingly.

In the preferred embodiment, the complete feed mechanism 30, which is formed by the frame 52 and the shaft 34 supported in the frame 52, is supported in the machine base or at the press. The seat for the access means 30 is embodied here as part of the hold-down support 14, but can also be embodied as another. In particular, the entry area of the press is height adjustable in its height to accommodate the compaction angle. The access mechanism is either integrated in this adjustable access area or its mounting at the bed or at the press frame follows the adjustment. Particularly preferably, the press frame serving as a machine base simply follows the movement of the entry region together. The guide plate 54, which is the guide device 54 or a part thereof, serves to keep the rollers 28 orderly in the gear wheel 36 and can be guided and oriented thereby.

Fig. 4 shows a possible configuration of the connection between the access mechanism 30 or the frame 52 to the press stand 14 in an enlarged view. This is done by means of two double-sided screws 40, which are guided through bearing bores 42 at the frame 52. A belleville spring assembly 44 is fitted over the bolt 40 which tensions the entry mechanism 30 against the press bracket 14. There is the possibility of padding the washer below the belleville spring assembly 44 to compensate for dimensional tolerances and adjust the entry mechanism 30 to an initial position (base position) in which the roller axis is oriented orthogonal to the direction of belt travel of the steel belt 18.

In the preferred embodiment, the bolt 40 can now be turned by means of the drive 56 and the position of the frame 52 relative to the press stand 14 changed. In a corresponding configuration, the position of the shaft 34 is thereby also changed in an advantageous manner in such a way that the rollers 28 enter the press not orthogonally but at a slight angle to the vertical. The adjustment is preferably carried out automatically and as a function of the measured values by means of a corresponding control system and regulating system (not shown).

In a further particularly preferred, but not illustrated embodiment, the drives 56 are arranged on both sides of the press, the drives 56 taking care of the adjustment of the frame 52 and thus of the access means 30 on both sides. However, other adjustment means may be provided, which are directly clamped at the frame and/or the frame 52, such as hydraulic cylinders or other suitable linear drives.

Fig. 5 to 7 show the influence of the inclination of the entry means 30 relative to the perpendicular (perpendicular) to the direction of belt travel of the steel belt 18.

In fig. 5, the belt run is ideally symmetrical in the middle. The rolling bars 28 are introduced orthogonally and run through under optimum pressing conditions. However, density differences or weight per unit area fluctuations in the nip 24 may lead to deviations of the rolled strip 28 and the steel strip 18.

In fig. 6, the roll bars 28 entering the mechanism at the press stand 10 tend to deviate to the right together with the steel strip 18. This causes platen 16 to be urged leftward in the opposite direction. The rollers 28 at the press ram 12 travel in reverse to the left and push the platens 16 to the right in the opposite direction. The offset movement of platen 16 is detected by suitable sensing means 48. Alternatively, the pushing force acting on platen 16 may be detected directly. The displacement of the roller 28 inclined to the vertical can likewise be detected by means of the sensor device 50. However, it is generally sufficient to detect the axial offset of the roller 28 perceptually, which can be done mechanically or optically.

In order to achieve the ideal, intermediate symmetrical belt travel according to fig. 5, it is now recommended to set the difference in the thrust forces at the press table 10 and at the press platen 16 of the press ram 12 to zero.

The thrust force can be measured directly by means of a force sensor device or indirectly by means of a travel sensor device depending on the deflection movement performed by the pressure plate 16 under the effect of the thrust force. Additionally, a measurement of the shaft orientation (shaft offset) of the roller strip 28 and a subsequent adjustment of the belt orientation (belt offset) are recommended. It can be assumed that the steel strip 18 follows the rolling bars 28.

The rollers 28 in the entry are introduced at an angle to the perpendicular to the steel strip 18 by adjusting the entry means 30 at the press stand 10 and the press ram 12 on at least one side, horizontally in the direction of the strip travel of the steel strip 18 or opposite to it (depending on the roller profile) (see fig. 7). The transverse force of the obliquely entering rollers 28 on the steel strip 18 causes the steel strip 18 to travel back to the neutral position again. The lateral force of the strip 28 applies a lateral thrust to the platen 16 at the press bed 10 and press ram 12, which can be measured by means of force sensors, stroke measurement systems, and others. By adjusting the entry mechanisms 30 at the press bed 10 and press ram 12 and the corresponding entry of the rollers 28, the difference in thrust on the platens 16 is minimized.

In an ideal situation, the platens 16 are subjected to little thrust as the rollers 28 and hence the steel strip 18 travel through the press with little lateral misalignment, and no offset, in the middle. Whereby the adjustment of the press table 10 and the inlet mechanism 30 of the press slide 12 can be optimized by measuring the lateral advance on the press plate 16.

The press table 10 and the entry means 30 of the press ram 12 are adjustable at least on one side by an angle orthogonal to the longitudinal axis of the press. The integrated guide 38 for the roller 28, for example the guide plate 54, the roller retainer, the guide cage and the guide rail, are adjusted together such that the mutual spatial relationship, the internal geometry and thus the function of the roller insertion remain unchanged at each position of the entry mechanism 30.

List of reference numerals:

10 pressure machine

12 press ram

14 pressing bracket

16 pressing plate

18 steel belt

20 guide roller

22 driving roller

24 pressing material

25 stripe blanket

26 guide chain

27 spring rod

28 rolling strip

30 entry mechanism

32 chain wheel

34 shaft

36 gear

38 guide device

40 bolt

42 bearing hole

44 disc spring assembly

48 sensor device

50 sensing device

52 frame

54 guide plate

56 driver.

Claims

1. A press for continuously producing material plates, having a flexible endless steel belt (18) which conveys the pressing pressure and pulls a material (24) to be pressed through the press, is guided around a press table (10) or a press ram (12) and is supported on a press platen (16) mounted on the press table (10) and the press ram (12) by means of running rollers (28) whose axes are guided transversely to the direction of belt travel,

the press has an entry mechanism (30) arranged in the press transversely to the production direction and having a frame (52) and a shaft (34) supported therein, the shaft having a gear (36) for guiding the roller strip (28) in an entry region of the press,

it is characterized in that the preparation method is characterized in that,

the shaft (34) is fixedly supported in the frame (52) and

at least one adjusting element is arranged for adjusting the position of the frame (52).

2. Press according to claim 1, characterised in that the material board is a particle board, a fibre board, a plywood board or a plastic board.

3. Press as claimed in claim 1, characterized in that the at least one adjusting element is a linear adjusting element.

4. Press according to claim 1, characterized in that at least one further guide means (38) is arranged at the frame (52) for guiding and/or orienting the roller bars (28).

5. Press according to one of claims 1 to 4, characterized in that the adjusting elements are arranged at the press and laterally at the frame (52) in the direction of passage of the steel belt (18), and the frame (52) is connected at the press on the other side by means of a fixing bracket.

6. Press according to one of claims 1 to 4, characterized in that at least two of the adjusting elements are arranged at the frame (52) of the entry means (30) on both sides in the direction of passage of the steel belt (18) and correspondingly at the press on the other active side thereof.

7. Press according to claim 6, characterized in that the admission mechanism (30) is movable along a linear guide.

8. Press according to one of claims 1 to 4, characterized in that a linear gear is arranged as the adjusting element.

9. Press according to one of claims 1 to 4, characterized in that a toggle lever is arranged as the adjusting element.

10. Press according to one of claims 1 to 4, characterized in that a screw drive is arranged as the adjusting element.

11. Press according to one of claims 1 to 4, characterized in that a direct drive is arranged as the adjusting element.

12. Press according to one of claims 1 to 4, characterized in that pneumatically embodied single-acting or double-acting hydraulic cylinders are arranged as the adjusting elements.

13. Press according to one of claims 1 to 4, characterized in that hydraulically embodied single-acting or double-acting hydraulic cylinders are arranged as the adjusting elements.

14. Press according to claim 3, characterized in that the frame (52) and/or the linear adjustment member are arranged in an initial position with respect to the press.

15. Press according to claim 14, characterized in that the frame (52) and/or the linear adjustment element are used to change the orientation of the roller strip (28) starting from the initial position.

16. Press according to one of claims 1 to 4, characterized in that the adjustment area of the frame (52) is adjustable by means of a fixed stop.

17. Press according to claim 3, characterized in that sensing means (48) for measuring thrust forces acting parallel to the axis of the rollers are arranged in the presser plate (16) and/or sensing means (50) for measuring the axial direction of the rollers (28) are arranged.

18. Press as claimed in claim 17, characterized in that the control or regulating means are arranged in operative connection with the sensor means and the linear adjustment member.