WO2015113686A1

WO2015113686A1 - Positioning device for a bar in a papermaking machine

Info

Publication number: WO2015113686A1
Application number: PCT/EP2014/077345
Authority: WO
Inventors: Frank Schmidt
Original assignee: Voith Patent Gmbh
Priority date: 2014-01-28
Filing date: 2014-12-11
Publication date: 2015-08-06
Also published as: CN204097790U

Abstract

The invention relates to a device (1) for positioning a bar with respect to a fabric in a machine for producing and/or processing a material web, in particular a fibrous web, such as a paper, cardboard or tissue web, having a top part (4) and a bottom part (3) which extend parallel to one another in each case in a longitudinal direction (2), wherein the top part (4) has a direct or indirect receptacle (5) for a bar, and the bottom part (3) is connected to the top part (4) by way of a mechanism in such a way that the spacing (A) and/or the angular position (7) about an axis which is parallel to the longitudinal direction (2) can be set between the top part (4) and the bottom part (3). The device (1) according to the invention is characterized in that the mechanism comprises at least one first thrust element (6) which is arranged in the longitudinal direction (2) between the top part (4) and the bottom part (3) and is mounted displaceably in at least two holders (8) which are spaced apart from one another in the longitudinal direction (2) and are fastened to the bottom part (3), wherein, in the region between the holders (8), the at least one thrust element (6) has an adjustment region (9) with an oblique course (12, 11) which points towards the top part (4) and towards the bottom part (3), wherein the oblique course (12) towards the top part (4) is parallel to the oblique course (11) towards the bottom part (3), and has a sliding element (10) which engages around the at least one thrust element (6) in the region of the adjustment region (9) and is connected to the top part (4), wherein the sliding element (10) is fixed in the longitudinal direction (2) with respect to the bottom part (3) in such a way that the spacing (A) of the top part (4) from the bottom part (3) changes as a result of the relative movement with respect to the sliding element (10) during displacement of the thrust element (6).

Description

Positioning device for a strip in a paper machine

The invention relates to a device for positioning a strip to a fabric in a machine for producing and / or processing a material web, in particular a fibrous web, such as a paper, board or tissue web, each extending in a longitudinal direction parallel to each other Upper part and a lower part, wherein the upper part has a direct or indirect support for a bar and the lower part is connected by a mechanism to the upper part so that the distance and / or the angular position about an axis parallel to the longitudinal direction, adjustable between the upper part and lower part is.

The invention also relates to a method for positioning a strip using a device according to the invention. Such devices are known in the art and are used, for example, to position dewatering strips in the forming area of a paper machine to a wire. On the one hand, there are applications in which the drainage bar is only pressed more or less against the drainage screen and on the other hand, the angle of the drainage bar to the sieve can be changed.

Document DE9105328 U1 describes a device of this type in which the angle of inclination of a drainage strip to the drainage wire can be adjusted. For this purpose, a carrier is provided with a groove and a rod arranged therein. Both elements are transverse to the screen. The rod has obliquely extending groove portions in the connected to the bar support pin. When moving the rod, the drainage strip is raised on one side and thus the inclination angle is adjusted. On the opposite side of the pin, the carrier is rotatably connected to the bar carrier. Devices of this type are elaborately designed, for example, to make the interaction of the parts play as much as possible to ensure accurate positioning of the drainage bar. In addition, this solution is susceptible to contamination. Another disadvantage is the large bending load of the pin during the adjustment process, which can lead to an inaccurate setting. Another embodiment of an apparatus for positioning a foil bar to a sieve is disclosed in document DE4306503 C2. A support profile is connected via inclined surfaces with a stationary support profile so that when moving the support profile transversely to the wire direction a change in height of the support profile is effected. To ensure the installation of the inclined surfaces to each other a pressing device is provided in the form of a supplied with internal pressure hose. This solution is elaborately designed to make the interaction of the parts play as much as possible to ensure accurate positioning of the drainage bar. Also, this solution is susceptible to contamination, whereby an accurate positioning is impaired.

The document DE4440944 C2 describes a solution similar to the document DE4306503 C2. A guide rail is connected via a slide with the rail support via balls, which are guided in lateral, oblique grooves of the rail carrier. The connection between carriage and guide rail is also made via balls. This solution is complex in terms of structure and assembly.

The document EP 1355002 Bl shows a device for adjusting the position of a squeegee with respect to the wire of a plant for paper production to control the contact pressure. The squeegee is mounted on a support bar, which are connected via second divided retaining strips with an upper and a lower part, with a baseboard. Under the skirting board, an air spring is attached. Between the upper and the lower part of the retaining strips adjusting elements with mutually wedge-shaped strips are attached. By moving the adjusting elements, the distance between the lower and upper part of the retaining strips is changed, so that the position of the wiper blade and thus the distance of the wiper blade to the screen belt changes. With this disclosed device, no change in the angular position of the wiper strip is possible.

It is an object of the invention to the known solutions an improved, simple and reliable device for positioning a bar to a fabric, as well as to provide a method for adjusting the strip position.

This object is solved by the features of claim 1. Thereafter, a device 1 is provided for positioning a strip to a fabric in a machine for producing and / or processing a material web, in particular a A fibrous web, such as a paper, board or tissue web, each having a longitudinally extending in a longitudinal direction parallel to each other upper part and a lower part, wherein the upper part has a direct or indirect recording for a bar and the lower part by a mechanism with the upper part is connected so that the distance and / or the angular position about an axis parallel to the longitudinal axis, between the upper part and lower part is adjustable. The invention is characterized in that the mechanism comprises at least a first, arranged in the longitudinal direction between the upper part and the lower part thrust element which is slidably mounted in at least two mutually longitudinally spaced, fixed to the lower part holders, said at least one thrust element in Area between the holders has an adjustment with pointing to the upper part and the lower part oblique course, wherein the oblique course to the upper part is parallel to the oblique course to the lower part, as well as the at least one thrust element in the region of the adjustment encompassing, connected to the upper part sliding element, wherein the sliding element is fixed in the longitudinal direction to the lower part so that the distance between the upper part and the lower part changes as a result of the relative movement to the sliding element when the pushing element is displaced.

The task of adjusting the ledge position is solved by the features of the single method claim.

The device is characterized by its simple, inexpensive construction and reliable function. The structure of the device consists only of mechanical parts. The provided in the at least one thrust element, facing the upper part and the lower part oblique curves of the contour of the thrust element in the adjustment are easy to manufacture. The sliding element engages in the adjustment, preferably completely, the thrust element. By this arrangement, the power flow from the bottom of the slider is passed directly -in a straight line- to the top. As a result, even large forces can be transmitted without deformation problems. The positioning accuracy is improved. The thrust element is thus slidably mounted in the sliding element, wherein the receptacle of the sliding element is adapted to the oblique course of the push rod in the adjustment. This has the advantage that when moving the push rod, the movement of the sliding element away from the lower part or towards the lower part in both directions is a positively driven movement. An occurring contamination of the push rod in the adjustment affects the Positioning accuracy not because the dirt is scraped off during the displacement of the push rod by the inclusion of the sliding element. In the prior art, the bearing clearance is minimized by, for example, an elastic air spring, which can escape a build-up pollution and the setting accuracy and reproducibility is thus reduced. The mechanism of the solution according to the invention, however, is more robust and less susceptible to contamination.

The device is expediently arranged, for example, in a machine for producing and / or processing a material web, such that the longitudinal direction points in the transverse direction to the running direction of the clothing.

In a practical embodiment, the sliding element is fixed in the longitudinal direction by stop elements fastened on both sides and supported on the respective adjacent holder. This allows a relative movement between the thrust element and sliding element and thus an exact and reproducible change in distance between the upper part and lower part. The stop element is freely supported in the direction of movement of the sliding element, so that it slides along the holder during a change in distance.

In an advantageous embodiment, the sliding element comprises a sliding bush, in which the at least first thrust element is mounted and which is rotatably arranged in the sliding element.

The thrust element is thus slidably mounted on the sliding bush in the sliding element, wherein the inclusion of the sliding bush is adapted to the oblique course of the push rod in the adjustment.

The sliding bush is preferably made of a material which has a low coefficient of friction in cooperation with the material of the pusher. Cheap materials are plastics, such as Teflon, polyamide. However, it can also consist of metallic materials which differ from the material of the thrust element, such as brass or bronze. It is also conceivable to use ceramic materials for this purpose.

In a practical embodiment, the distance of the adjacent holder is between at most 300 mm and a minimum of 80 mm, preferably between at most 200 mm and minimal 100 mm. The distance should on the one hand not fall below a minimum, to ensure favorable balance of power when moving the pusher. On the other hand, the distance must not be too large to support the upper part sufficiently by the sliding element. In a practical case, the distance may advantageously be 124 mm.

It is favorable if the push element comprises a profile with a rectangular cross-section. The longitudinal side is aligned in the direction of movement of the upper part. As a result, the oblique course of the contour of the pusher element in the adjustment region can be produced inexpensively. In addition, a high bending stiffness of the pusher is achieved by this rectangular profile and its orientation in the direction of movement of the upper part.

It is also conceivable if the thrust element comprises a profile with a round cross-section. In a practical embodiment, the oblique course of the pusher in the adjustment is produced by machining, such as milling or sawing, or by cutting with a laser.

It is also possible to produce the oblique course of the thrust element in the adjustment by bending. This is conceivable in particular when using a round cross-sectional profile of the pusher element.

In a practical embodiment, viewed in the longitudinal direction, the at least one thrust element is arranged in the middle of the sliding element, so that when moving the thrust element, the distance of the upper part changed to the lower part, without changing the angular position between the upper part and lower part.

In a further practical embodiment, as viewed in the longitudinal direction, the at least one thrust element is offset towards an edge of the sliding element and the sliding element is rotatably mounted on the opposite edge relative to the lower part, so that when the thrust element is displaced, the angular position of the upper part changes to the lower part. This has advantages for such applications in which the upper part is to be tilted relative to the lower part, that is, the angular position between the upper part and lower part to be changed. In a further advantageous embodiment, as viewed in the longitudinal direction, the at least one thrust element is offset towards an edge of the sliding element and a second thrust element is provided at the opposite edge of the sliding element. This embodiment allows both the change of the distance, as well as to change the angular position between the upper part and lower part. To change the distance, both thrust elements are shifted in the same direction by the same path. Provided that the geometry and arrangement of both pusher elements is the same, the upper part moves parallel to the starting position away from the lower part or toward the lower part. If, on the other hand, the push rods are displaced by a different path, the upper part experiences a combined movement of tilting and displacement. When moving only one thrust element only angular movement takes place around the other sliding element rotatably mounted in the sliding element. By selecting the distance of the thrust elements transversely to the direction of movement of the upper part, the sensitivity of a change in the angular position can be determined.

The at least one thrust element is preferably associated with a linear drive.

Further, it is advantageous if the linear drive from the group electric cylinder, pneumatic cylinder, hydraulic cylinder, screw jack, manually operated linear drive, for example, a hand crank with threaded spindle is selected.

In a practical embodiment, a plurality of holders with intermediate adjustment areas and sliding elements are provided in the longitudinal direction. By a related dimensioning be ensured on the one hand favorable balance of power when moving the thrust element and on the other hand, the upper part sufficiently supported by the sliding elements.

To reduce pollution, viewed in the longitudinal direction, on at least one side extending in the longitudinal direction between the upper part and lower part cover provided. This prevents the ingress of dirt into the mechanism.

Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings. Show it

Figure 1 shows a detail of an embodiment of a device according to the invention in a spatial representation;

Figure 2a shows a detail of a device according to the invention, viewed transversely to the longitudinal direction, with a maximum distance between the upper part and lower part

Figure 2b shows a detail of a device according to the invention, seen transversely to the longitudinal direction, with a reduced distance between the upper part and lower part

Figure 3 a is a sectional view of a device according to the invention

corresponding to the section lines A-A indicated in FIG

Figure 3b is a sectional view of a device according to the invention

corresponding to the section lines B-B indicated in Figure 1 is a plan view of a device according to the invention

FIG. 1 shows a detail of an embodiment of the invention

Device 1 in a spatial representation using the example of a positionable

Entwässerungsleiste 17 shown for a former of a paper machine. The device 1 comprises an upper part 4 extending parallel to each other in a longitudinal direction 2 and a lower part 3, the upper part 4 having a direct or indirect receptacle 5 for a drainage strip 17 and the lower part 3 connected to the upper part 4 by a mechanism is that the distance A and / or the angular position 7 about an axis parallel to the longitudinal direction 2 axis, between the upper part 4 and lower part 3 is adjustable. The mechanism comprises at least a first, arranged in the longitudinal direction 2 between the upper part 4 and the lower part 3 thrust element 6, which is slidably mounted in at least two spaced longitudinally 2, fixed to the lower part 3 holders. The at least one push element 6 has in the area between the holders 8 an adjustment 9 with the upper part 4 and the lower part 3 facing oblique course 12, 11, wherein the oblique course 12 to the upper part 4 parallel to the oblique course 11 to the lower part 3. The holders 8 have a distance of 124 mm in this example. The at least one push element 6 is in the range of

Adjustment 9 of a connected to the upper part 4 slider 10 so encompassed that the sliding member 10 slides on the surfaces of the oblique courses 11,12 of the thrust element 6 and thus positively driven in both directions. The

Sliding element 10 is fixed in the longitudinal direction 2 to the lower part 3 so that the distance A of the upper part 4 to the lower part 3 changes due to the resulting relative movement to the sliding element 10 when the pushing element 6 is displaced. It is important that in the

Adjustment 9 of the oblique course 12 of the thrust element 6 to the upper part 4 out parallel to the oblique course 11 of the thrust element 6 to the lower part 3 extends. Only then is a positively driven height movement of the sliding element 10 possible. In the figure 1 an embodiment of the device 1 is exemplified with a first and a second thrust element 6. The lower part 3 is firmly mounted on the molding of the former. For actuating the thrust elements 6, a linear drive 15 is shown in the embodiment of an electric cylinder. The linear drive 15 is connected via a connecting part fixed to the lower part 3. In this exemplary embodiment, both thrust elements 6 by a single linear actuator 15 for adjusting the distance of

Drainage strip 17 driven for covering. It is, however, as already

described, also possible, each thrust element 6 assign its own linear actuator 15, in addition to the height position of the drainage strip 17 and their

Adjust angular position 7 for covering. This is advantageous in the case of drainage strips which are arranged at an angle to the drainage screen. In these, so-called Foilleisten be increased by the angular position of the dehydration effect and at the same time pressure pulses into the pulp suspension, to influence the

Formation of the formed fibrous web, initiated. The optimum angle can be adjusted by the device according to the invention for each operating condition. In the illustrated detail of the device 1, only one shift range 9 is shown. However, the device 1 has in the longitudinal direction 2 several adjustment 9 with associated sliding elements 10 and adjacent holders 8.

FIGS. 2 a and 2 b each show a section of a device according to the invention

Device 1, seen transversely to the longitudinal direction 2, with different distances A between the upper part and lower part shown. In the situation shown in Figure 2a, the thrust element 6 has been moved to the left by the maximum displacement. As a result, the slider 10 was moved all the way up and thus the maximum distance A between the lower part 3 and upper part 4 is reached. The drainage strip 17 was thus moved in the direction of the stringing. In comparison, the figure 2b shows a lowered position of the upper part 4, by moving the thrust element. 6 to the right, was reached. The pushers 6 are made of a stainless steel profile with a rectangular cross-section. The oblique courses 11, 12 in the adjustment area 9 are generated from the Rechteckprofü by means of laser cutting. FIGS. 3 a and 3 b show a device 1 according to the invention in two sectional representations corresponding to the section lines AA and BB indicated in FIG.

In the figure 3a, the storage of the pushers 6 in the holder 8 can be seen. The pushers 6 are made of a stainless steel profile with a rectangular cross-section and are all around in the holder 8 free of play and slidably mounted. The holders 8 are mounted on the lower part 3. The upper part 4 has a T-profile 5 for direct or indirect absorption of the drainage strip 17. To reduce pollution on both sides in the longitudinal direction 2 between the upper part 4 and lower part 5 extending cover 16 are provided. This prevents the ingress of dirt into the mechanism. The cover 16 are on the one hand firmly connected to the upper part 4 and on the other hand connected to the lower part 3 with a resilient seal. As a result, the sealing effect despite spacing changes between lower part 3 and upper part 4 can be maintained.

In FIG. 3b, the section BB has been laid through the sliding element 10. In addition to the representation in FIG. 3 a, the connection of the sliding element 10 to the upper part 4 can be seen here. The pushers 6 are passed through the slider 10 and slidably mounted. The sliding elements 6 are encompassed by the sliding element 10 in the region of the adjustment region 9 in such a way that the sliding element 10 slides on the surfaces of the oblique courses 11, 12 of the pushing element 6 and is thus forcibly guided in both directions. It is important that, in the adjustment region 9, the oblique course 12 of the thrust element 6 extends towards the upper part 4 parallel to the oblique course 11 of the thrust element 6 towards the lower part 3. Only then is a positively driven height movement of the sliding element 10 possible. The sliding element 10 comprises in this example for each thrust element 6 sliding bushes 14 in the region of the adjustment 9. The thrust elements 6 are thus slidably mounted on the sliding bushes 14 in the sliding member 10, wherein the inclusion of the sliding bushes 14 are adapted to the oblique course of the push rod in the adjustment 9 , The sliding bushes 14 are preferably made of a material which in cooperation with the material of the thrust element 6 a small Has friction coefficient. Cheap materials are plastics, such as Teflon, polyamide. However, they can also consist of metallic materials which differ from the material of the thrust element, such as brass or bronze. It is also conceivable to use ceramic materials for this purpose.

The pushers 6 are arranged offset to the edges of the sliding member 10. This embodiment allows both the change of the distance A, as well as the change of the angular position 7 between the upper part 4 and lower part 3. To change the distance A, both pushers 6 are shifted in the same direction by the same path. Provided that the geometry and arrangement of both thrust elements 6 is the same, the upper part 4 moves parallel to the starting position away from the lower part 3 or towards the lower part 3. If, however, the push rods 6 are displaced by a different path, the upper part 4 undergoes a combined movement of tilting and displacement. When moving only one pusher 6 is only an angular movement about the rotatably mounted in the sliding element 10 other thrust element 6 instead. By selecting the distance of the thrust elements A transversely to the direction of movement of the upper part 4, the sensitivity of a change in the angular position 7 can be set. In the figure 3a the planes Eu and Eo of the lower part 3 and the upper part 4 are shown at a certain angular position 7 of 0 °. In the position shown, both planes Eu, Eo run parallel. If the pusher elements 6 are moved by different routes or if only one pusher element 6 is displaced, the upper part 4 is tilted and the angular position 7 changes accordingly. The planes Eu and Eo then form an angle 7 not equal to 0 °.

FIG. 4 shows a top view of an embodiment according to the invention of FIG. 1 without top 4. The sliding elements 10 are supported on both sides by stop elements 13 on the holders 8 in the longitudinal direction 2. The stop element 3 are screwed tight to the sliding element 10 and are supported displaceably on the holders 8.

LIST OF REFERENCE NUMBERS

1 device

2 longitudinal direction

3 lower part

4 shell

5 recording

6 push element

7 angular position

8 holders

9 adjustment range

10 sliding element

11 oblique course to the lower part

12 oblique course to the top

13 stop element

14 sliding bush

15 linear drive

16 cover element

17 bar

A distance

Eu level lower part

Eo level shell

Claims

Patent claims

Device (1) for positioning a strip to form a covering in a machine for producing and/or processing a material web, in particular a fibrous web, such as a paper, cardboard or tissue web, with a strip that is parallel in a longitudinal direction (2). each other

extending upper part (4) and a lower part (3), the upper part (4) having a direct or indirect receptacle (5) for a strip and the lower part (3) being connected to the upper part (4) by a mechanism in such a way that the distance (A) and/or the angular position (7) can be adjusted between the upper part (4) and the lower part (3) about an axis parallel to the longitudinal direction (2),

characterized in that.

the mechanism comprises at least one first thrust element (6) arranged in the longitudinal direction (2) between the upper part (4) and the lower part (3), which is fastened to the lower part (3) in at least two holders spaced apart from one another in the longitudinal direction (2). (8) is slidably mounted, the at least one thrust element (6) in the area between the holders (8) having an adjustment area (9) with an oblique course (12, 11) pointing towards the upper part (4) and the lower part (3), wherein the oblique course (12) to the upper part (4) is parallel to the oblique course (11) to the lower part (3), and one which surrounds the at least one thrust element (6) in the area of the adjustment region (9) and with the upper part (4)

connected sliding element (10), wherein the sliding element (10) in

Longitudinal direction

(2) is fixed to the lower part (3) in such a way that the distance (A) of the upper part (4) to the lower part (3) changes due to the relative movement to the sliding element (10) when the pushing element (6) is moved.

Device according to claim 1,

characterized in that

the sliding element (10) is fastened on both sides and is attached to the respective one adjacent holder (8) supporting stop elements (13) is fixed.

3. Device according to claim 1 or 2,

characterized in that

the sliding element (10) comprises a sliding bushing (14) in which the at least first thrust element (6) is mounted and which is rotatably arranged in the sliding element (10).

4. Device according to one of the preceding claims,

characterized in that

the distance between the adjacent holders (8) is between a maximum of 300 mm and a minimum of 80 mm, preferably between a maximum of 200 mm and a minimum of 100 mm.

5. Device according to one of the preceding claims,

characterized in that

the thrust element (6) comprises a profile with a rectangular cross section.

6. Device according to one of claims 1 to 4,

characterized in that

the thrust element (6) comprises a profile with a round cross section.

7. Device according to one of the preceding claims,

characterized in that

In the adjustment area (9), the oblique course (11, 12) of the thrust element (6) is generated by machining or by cutting with a laser.

8. Device according to one of the preceding claims,

characterized in that

In the adjustment area (9) the oblique course (11, 12) of the thrust element (6) is generated by bending.

9. Device according to one of the preceding claims,

characterized in that

seen in the longitudinal direction (2), the at least one thrust element (6) is arranged offset towards an edge of the sliding element (10) and the sliding element (10) is rotatably mounted on the opposite edge relative to the lower part (3), so that when the pushing element (6) is moved, the angular position (7) of the upper part (4) changes relative to the lower part (3).

10. Device according to one of claims 1 to 8,

characterized in that

Seen in the longitudinal direction (2), the at least one thrust element (6) is arranged offset towards an edge of the sliding element (10) and a second

Thrust element (6) is provided on the opposite edge of the sliding element (10).

11. Device according to one of the preceding claims,

characterized in that

that a linear drive (15) is assigned to the at least one thrust element (6).

12. Device according to claim 11,

characterized in that

that the linear drive (15) is selected from the group of electric cylinders, pneumatic cylinders, hydraulic cylinders, screw jacks, hand-operated linear drives.

13. Device according to one of the preceding claims,

characterized in that

in the longitudinal direction (2) several holders (8) with intermediate adjustment areas (9) and sliding elements (10) are provided.

14. Device according to one of the preceding claims,

characterized in that

Seen in the longitudinal direction (2), a cover element (16) extending in the longitudinal direction (2) is provided on at least one side.

15. A method for positioning a strip to form a covering in a machine for producing and/or processing a material web, in particular a fibrous web, such as a paper, cardboard or tissue web, with a device according to one of claims 1 to 14, characterized in that

To adjust the angular position (7) of the upper part (4) to the lower part (3) only the at least one thrust element (6) is moved or to adjust the distance (A) between the upper part (4) and lower part (3) the at least first and that second thrust element (6) can be moved.