JPH11279976A - Shoe press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shoe press capable of enduring the deformation of a relatively large extension in the width direction and others of the press shoe without causing problems related to a conventional shoe press. SOLUTION: This shoe press 10 for pressurizing to a moving paper web W or its equivalent comprises a press shoe 12 extending over the overall width of the web W fed into a nip N formed between the shoe 12 an a packing member 16, a support 18 for the shoe 12 and plural connecting hydraulic type loading cylinders 22 and 24 for driving the shoe 12 arranged between the support 18 and the shoe 12 to the packing member 16 and pressurizing the web W. The respective loading cylinders 22 and 24 include one piston 26 and the first and the second cylinders 22 and 24 respectively attached to the shoe 12 and support 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a shoe press for pressing a running paper web, paperboard web or equivalent. In particular, the invention has a support,
The support supports the press shoe, the press shoe is adjacent to a counter roll or other backing member, the press shoe and the backing member form an extended nip therebetween, and the press shoe is attached to the backing member. The present invention relates to a shoe press of the type having a hydraulic device for pressing against a web passing through a nip by propelling it toward the nip.

[0002]

BACKGROUND OF THE INVENTION In paper machines, the wet paper web or its equivalent from the forming section of the paper machine is generally fed into a nip of a shoe press of the type described above, where the web is subjected to two layers of water absorption. It is compressed between felt or its equivalent to leach and drain water from the web. Such a shoe press can also be used for calendering the web downstream of the forming section.

[0003]

Various shoe presses of the type described above have been proposed. For example, U.S. Pat.No. 4,917,768 of the same applicant as the present patent application discloses a press shoe which comprises a tubular sleeve rigidly secured to a support and spaced laterally on the support. Are held on the support, and the sleeves are slidably received in the cylindrical recesses of the press shoe, causing the press shoe to move closer to or away from the counter roll and change the nip pressure. Let it. The shoe press includes hydraulic jacks upstream and downstream of those sleeves to propel the press shoe toward the counter roll, pivot the shoe about the width axis, and change the nip pressure in the flow direction. Let it. These sleeves are somewhat loosely fitted into the recesses in the shoe,
A resilient seal surrounds each sleeve to seal the interface between the sleeve and the recess. Thus, the press shoe can pivot in the flow direction relative to the support to change the nip pressure.

One of the challenges encountered in shoe presses is the frictional heat of the shoes due to the belt being conveyed into the press and the thermal expansion of the shoes due to the hot hydraulic fluid circulating through the shoes for various purposes. is there. Thermal expansion of the shoe causes stretching in the width direction. In the shoe press disclosed in U.S. Pat.No. 4,917,768, such thermal expansion of the shoe places the sleeve in bending stress,
Not desirable. Although the shoe in U.S. Pat. No. 4,917,768 can slide on the piston of the hydraulic jack, the shoe expands due to thermal action as a result of the piston exerting a large vertical force on the shoe during operation of the shoe press. Then, a substantial frictional force is generated on the piston. Thus, the pistons are placed in a bent state in the cylinder of the hydraulic jack, which bending leads to a malfunction of the jack, especially where thermal expansion causes a relatively large parallel movement of the shoe with respect to the support and the piston. This is noticeable in the cylinder at the outer end of the shoe furthest from the line. Bending of the piston is undesirable in terms of wear of the piston, cylinder and seal, and may interfere with the normal operation of the press. In addition, thermal expansion of the shoe can cause leakage of hydraulic fluid if the seal is over-deformed.

[0005] In part because of the above-mentioned problems with bending of the sleeves, Applicants have filed a patent with US Pat. No. 4,91,91.
Another shoe press was developed, similar to that disclosed in US Pat. No. 7,768, but without the sleeve. However, this shoe press still suffered from the problem of bending of the piston of the hydraulic jack described above. Furthermore, because the shoe was freely supported on the piston of the hydraulic jack, the shoe could freely assume various positions with respect to the support beam and the counter roll. More specifically, the shoe could be tilted so that one end of the shoe moved toward the downstream end of the flow and the opposite end moved toward the upstream end of the flow. Due to the frictional force between the shoe and the piston,
Once the shoe was tilted, it was difficult to readjust the shoe to the correct position.

The present invention overcomes these shortcomings of the prior art, and presents the above-described problems associated with some conventional shoe presses for relatively large stretches and other press shoe deformations. To provide a shoe press that can be durable without using.

[0007]

SUMMARY OF THE INVENTION In one embodiment of the present invention, a shoe press includes a press shoe extending across the width of the web conveyed through the press and a spacing along the shoe in the width direction. And a plurality of hydraulic load cylinders supported by the support. These load cylinders form a working chamber that can be pressurized by hydraulic fluid, and the load cylinder pushes the press shoe away from its support, propelling it toward a counter roll or other backing member, and Pressure is applied to the web being conveyed into the nip between the backing member. Each load cylinder has a piston member disposed within the cylinder member.
One of the piston member and the cylinder member has a first member fixed to the press shoe and a second member fixed to the support.
And the other of the piston member and the cylinder member includes a joint. For example, in one embodiment, the two-piece member includes first and second cylinders, and the coupling includes a piston slidably received within both cylinders. In another preferred embodiment, the two-piece member includes first and second pistons, and the coupling includes a cylinder surrounding both pistons.

The joint engages both the first and second members in a hermetically sealing manner, and pressurizes the working chamber to urge the first member away from the second member in a load direction, thereby backing the press shoe. Promote toward the member. Each joint engages each of the first and second members with a seal in order to accommodate the extension of the press shoe in the width direction in the load cylinder, and the seal engages the joint with the first and second members. To pivot about an axis parallel to the flow direction. Therefore, the press shoe freely expands in the width direction without bending any piston member and / or cylinder member of the load cylinder.

According to a preferred embodiment of the present invention, each load cylinder includes first and second cylinders and one piston. A first working chamber is formed by the first cylinder and the first end of the piston slidably received therein, and the second cylinder is slidably received therein. A second working chamber is formed by the second end of the piston. Each working chamber can be pressurized by a hydraulic fluid, pushing the press shoe in the load direction away from the support and closer to the backing member. Desirably, the piston includes a passage connecting the two working chambers to allow fluid communication therebetween. One of the press shoe and the support includes a supply passage for supplying pressurized hydraulic fluid to one of the first working chamber and the second working chamber. Advantageously,
The supply channel is located in the support for supplying liquid to the second working chamber.

[0010] Various arrangements of cylinders and pistons are possible within the scope of the invention. According to one preferred embodiment, the piston includes a tubular member having a generally cylindrical inner surface and an outer surface. The first end and the second end of the piston each have an annular flange which projects radially outward beyond the cylindrical outer surface of the piston, each flange supporting an elastic compressible seal. doing. The dimensions of the radii of these flanges are sufficiently large relative to the size of their shafts and the length of the shaft of the piston part in the cylinder that a considerable amount of pivoting movement of the piston about an axis parallel to the direction of flow is obtained. Degree. Desirably, the second cylinder includes a stop member that extends radially inward to a smaller diameter than the flange on the second end of the piston to allow movement of the piston in the load direction away from the support. Restrict.

According to yet another preferred embodiment of the present invention,
A hydraulically operated shoe retraction actuator is located within at least one piston of the load cylinder. Either the support or the shoe includes a passage adapted to supply hydraulic fluid to the shoe retraction actuator, the actuator being hydraulically operable to move the shoe away from the counter roll and back toward the support. . The shoe pull-back actuator is preferably an actuator piston attached to the support and extending into the piston of the load cylinder, and a chamber surrounding the actuator piston to be sealed and pressurizable by hydraulic liquid. An actuator cylinder that propels the cylinder toward the support. The actuator cylinder engages a protrusion fixed to the press shoe, and urges the press shoe toward the support by actuation of the shoe pull-back actuator.

The above and other objects, components and advantages of the present invention will be further clarified in the following description of preferred embodiments of the present invention with reference to the drawings.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the preferred embodiments shown in the drawings. However, the invention is not limited to the embodiments shown and described herein.

FIGS. 1-3 show a shoe press 10 according to a first preferred embodiment of the present invention. The shoe press 10 includes a press shoe 12, which is disposed in contact with one surface 14 of the shoe press, and is entirely complementary in contour to a backing member such as a counter roll 16 shown in FIG. . The shoe 12 and the counter roll 16 form a nip N into which a moving paper, paperboard or equivalent web W is fed. The web W is typically conveyed by an endless belt B and contacts one or more press felts F or other absorbent material. The shoe press 10 can be used in a press section and / or a calendar of a paper machine, and can also be used as a pre-press in a forming section of the paper machine. When used in the calendering or forming section of a paper machine, the web W can be used in the apparatus 10 without any absorbent felt.
Sent to

The shoe press 10 further includes a support 18. The shoe 12 and the support 18 are long in the width direction (as best seen in FIG. 3) and extend at least along the entire width of the web W, and preferably the shoe 12 is slightly wider than the web W. The shoe 12 is supported by a support 18, and is connected to the backing member 16 by a plurality of connecting hydraulic load cylinders 20 disposed between the support 18 and the shoe 12 and spaced apart in the width direction. To press the web W.

Each load cylinder 20 has a piston member and a cylinder member, one of which is made of two parts and the other of which forms a joint between the two parts. I have. More specifically, this two-piece member of the load cylinder is a first
, A second cylinder 24 fixed to the support 18, and a piston 26 slidably received by each of the cylinders. In the embodiment illustrated in FIGS. 1-3, the first cylinder 22 has a hole made in its shoe 12. The second cylinder 24 is a member made separately from the support 18 and secured thereto.

A first end 28 of the piston 26 is slidably received within the first cylinder 22 and a second end 30 of the piston.
Is slidably received in the second cylinder 24. An elastic compressible seal 32 surrounds each end of the piston 26 to seal the inner surface of the cylinder. Thereby, a first working chamber 34 is formed between the first end 28 of the piston 26 and the side and end walls of the first cylinder 22, and a second working chamber 36 is formed at the second end of the piston. 30 and second cylinder 24
Formed between the side wall and the end wall. Piston 26 includes a passage connecting the first and second working chambers to allow fluid communication therebetween. The support 18 includes a supply passage 40 for supplying pressurized hydraulic liquid to the second working chamber 36. Supply path
40 is connected to a hole 42 in a fastening device 44 used to secure the second cylinder 24 to the support 18. Accordingly, the pressurized liquid supplied to the second working chamber 36 from the passage 40 is pushed away from the first cylinder 22 and the second cylinder 24 to be separated from each other. Shoe 12 is therefore propelled toward backing member 16. The first working chamber 34 is also pressurized through a passage 38 in the piston 26 substantially like the second chamber. The first end 28 and the second end 30 of the piston are substantially similar, as shown in FIGS. 1-3, and the net axial force of the piston 26 is therefore substantially zero.

The piston 26 preferably includes a spherical surface 46 facing the inner surfaces of the cylinders 22 and 24. The elastic compressible seal 32 extends radially outward from the spherical surface 46 and contacts the inner surface of the cylinder. Accordingly, the piston 26 can pivot about an axis parallel to the flow direction and the width direction while maintaining a proper sealing of the working chamber for both cylinders. FIG. 2 shows the shoe 12 and the first shoe pivoted relative to the piston 26 about an axis parallel to the width direction.
Of the cylinder 22 is shown. FIG. 2 shows only one of the load cylinders 20, but not all cylinders along the width direction.
Twenty pistons pivot with respect to the shoe 20 so that the shoe can pivot with respect to the support 18 as a unit. FIG.
Denotes a pair of load cylinders 20, in which the shoe 12 moves in parallel in the width direction (to the left in FIG. 3), resulting in a piston
26 pivots relative to both cylinders 22 and 24 about an axis parallel to the direction of flow. Therefore, the load cylinder 20 can be used for both pivotal and parallel movements.
Allows substantial freedom of 20 movements.

The shoe press includes a guide rail or stop 48 that limits the extent to which the shoe can move, since the shoe 12 can perform a parallel movement in the flow direction with respect to the support 18. The loading cylinder 20 further includes a stop ring 50 that limits movement of the piston 26 away from the support 18 in the loading direction. The stop ring 50 is secured to the outermost end of the second cylinder 24, extends radially inward, and has a smaller diameter than the diameter of the spherical surface 46 on the second end of the piston 26. Each piston 26 has a reduced diameter portion 52 extending axially at the center of the piston axis between the spherical surfaces 46 at each end. The reduced diameter portion 52 is smaller in diameter than the inner surface of the stop ring 50 on a sufficient length in the axial direction of the piston 26 so that the piston has some extent of axial movement within the second cylinder 24. It is possible.

The shoe press 10 further has a static pressure compartment 54 for refueling, as is well known in the art, in the surface 14 facing the counter roll 16. The compartment 54 is supplied with hydraulic fluid by a tube 56 attached to the shoe 12 and communicating with the compartments via a passage 58 in the shoe.

FIG. 4 is similar to the above-mentioned one, and
FIG. 6 shows a second preferred embodiment of the invention in the form of a shoe press 10 'having a row of load cylinders 20' (the main difference being that the diameter of the load cylinders 20 'is small); Are spaced in the flow direction to change the nip pressure in the flow direction.

FIG. 5 shows a third preferred embodiment of the present invention. The shoe press 110 of FIG. 5 includes a load cylinder 120 in which a first cylinder 122 is formed not as a recess in the shoe 112, but rather as a separate member, similar to the second cylinder 124. I have. Load cylinder 12
To zero, hydraulic fluid is supplied through a passage 140 in the shoe 112 and further through an opening 142 in the first cylinder 122. Fluid may be supplied to passage 140 via a tube (not shown) attached to shoe 112 in a manner similar to that shown in FIGS. FIG. 5 also shows a form of deformation of the shoe 112 caused by thermal expansion, whereby the two load cylinders 120 on the left, which are located on one side of the axial center line in the flow direction, are moved in the flow direction. With their pistons 126 pivoting in one direction about a parallel axis, the two loading cylinders 120 to the right of the center line pivot in opposite directions about an axis parallel to the flow direction. They have pistons 126. Further, it is also shown that piston 126 is a hollow tubular member, as opposed to the generally solid pistons 26 and 26 'of the press shown in FIGS. This construction of the piston 126 saves material as compared to a solid type piston.

FIG. 6 shows a fourth preferred embodiment of the present invention. The shoe press 110 'of FIG. 6 employs a load cylinder 120' having a two-piece member as a piston and a joint as a cylinder. Therefore, the load cylinder 120 '
It includes a first piston 126a secured to 112 ', a second piston 126b secured to support 118', and a cylinder 122 'for slidably receiving both pistons. A common working chamber 134 'is formed between the pistons 126a and 126b. The working chamber 134 'is connected to a passage 142' extending through a fastening device 144 'that secures the second piston 126b to the support 118'.
A pressurized liquid is supplied by a passage 140 'in the support 118'. Ring 50 ', functionally similar to ring 50 of FIG.
Is fixed to the end of the cylinder 122 'adjacent to the shoe 112' to prevent the piston 126a from being retracted from the cylinder 122 '.

FIG. 7 shows a fifth preferred embodiment of the present invention. The shoe press 210 shown in FIG.
The first cylinder 222 and the second cylinder 224 are separate members secured to the press shoe 212 and the support 218, respectively, wherein the piston 226 is formed as a hollow tubular member. First cylinder 222
Has an end wall 223 that abuts the press shoe 212 and a hollow tubular portion 225 that normally projects from the end wall 223 toward the second cylinder 224. Similarly, second cylinder 224 has an end wall 227 that abuts support 218 and a hollow tubular portion 229 that normally projects from end wall 227 toward first cylinder 222. Each tubular portion 225 and 229 has a cylindrical inner surface.

The piston 226 includes a flange 231 adjacent each end of the piston. The flange 231 is generally annular and projects radially outwardly beyond the cylindrical outer surface of the piston. Outer radial surface 23 of flange 231
3 is preferably spherical, but need not be. Each flange 231 includes a groove 235 that continuously surrounds the piston and receives a pair of resiliently compressible seal rings 237a and 237b. Inner seal ring 237a is desirably rubber or a material having compressive and elastic properties similar to rubber. Outer seal ring 237b contacts the inner surface of the cylinder and is preferably made of a material that is somewhat harder than the inner seal ring. A suitable material is, for example, a polymer with a bronze additive, but other materials may be used instead. The outer seal ring 237b protrudes radially outward from the spherical surface 233 of the flange and has a larger diameter than the inner surfaces of the cylinders 222 and 224 in an undeformed state. ing. Therefore, seal rings 237a and 237b
Are compressed and by their elasticity they
Maintains tight contact with the cylinder over a pivoting range of 226. Further, the radially outward length of the flange 231 is sufficiently long with respect to the axial length of the flange and the axial length between the two flanges, so that the piston 226 can move the seal ring 237b over a relatively large angular range. , Can pivot while maintaining proper sealing contact with the cylinder.

To assist in disassembly and assembly of the shoe press, the first cylinder 222 is secured to the shoe 212 by a pair of clamps 239 and 241 adjacent to the shoe upstream and downstream, respectively. The clamp includes a projection 243 that secures the annular flange 245 of the first cylinder 222 between the shoe 212 and the projection 243. The holes 247 of these clamps 239 and 241 through which the fastening device penetrates to secure these clamps to the shoe are not equally arranged with respect to the projection 243. This allows
Clamps 239 and 241 can be interchanged to move first cylinder 222 in the direction of flow relative to shoe 212. Although not shown, the support 218 also includes an adjustment mechanism for moving the support and the second cylinder 224 in the flow direction. The adjustment mechanism may be a pair of clamps (not shown) similar to, for example, clamps 239 and 241 for securing support 218 to the frame structure, or alternatively, a second clamp.
A pair of clamps may be used to secure the cylinder 224 to the support 218. Therefore, in order to change the load center on the shoe, the entire load cylinder 220 is
With respect to the flow direction.

Referring to FIGS. 7 and 10, shoe press 210 includes components that limit the movement of shoe 212 in the upstream, downstream, and width directions. As described above with respect to FIGS. 1 and 2, a stop 48 is positioned adjacent to and downstream of the shoe 212 to limit the range of motion downstream of the shoe 212. Further, a pin 49 is secured downstream of the shoe 212 and projects outwardly therefrom in the flow direction. The stop 48 includes a slot 51 into which a pin 49 extends. The pin 49 is arranged at the middle point of the width of the shoe 212 in the width direction as shown in FIG. The slot 51 extends in the load direction, so that the shoe 212 is free to move toward and away from the counter roll. However, the slot 51 is slightly wider than the pin 49, so that the shoe 212 is restricted from moving in the width direction.
Furthermore, the pins 49 that engage the slots 51 do not cause all of the thermal expansion in the width direction of the shoe 212 to occur in one direction, but rather occur in both directions on either side of the longitudinal centerline of the shoe press 210. Make sure that.

The shoe press 210 further includes pins 249 secured to opposing side edges of the shoe 212 and extending widthwise outward therefrom. A pair of stops 248 are positioned adjacent on opposite sides of the shoe 212 and can abut the pins 249 as the shoe 212 moves upstream. Thus, the stop 248 and the pin 249 limit the range of movement of the shoe in the upstream direction, and also help prevent the shoe 212 from being tilted such that one side is more upstream than the other. . Stop 248 and pin 249
Instead, a single elongated stop (not shown) may be located adjacent to the upstream edge of shoe 212 and serve the same purpose as stop 248 and pin 249.

Preferably, at least one, and more preferably some of the loading cylinders of shoe press 210 include a self-contained shoe retraction actuator operable to pull shoe 212 away from the counter roll. FIG. 8 shows one of the load cylinders 220 'having a shoe retraction actuator 260. Actuator 260 includes an actuator piston 262 having a mandrel 264 secured to support 218 and typically projecting therefrom toward shoe 212. Actuator cylinder 266 surrounds the actuator piston and defines a working chamber 268 that can be pressurized with hydraulic fluid to urge actuator cylinder 266 toward support 218. The mandrel 264 of the actuator piston includes a passage 270 for supplying liquid into the chamber 268, and the support 218 includes a passage 272 for the liquid that connects with the passage 270 in the mandrel. The chamber 268 is pressurized without interruption during operation of the shoe press, and the chamber 26
8 the pressure in the working chamber 234 of the load cylinder 220 '
To avoid damage to the actuator. When the press shoe 212 is pulled away from the counter roll, the pressure in the working chamber 234 decreases and becomes lower than that in the chamber 268.

Actuator cylinder 266 at the end adjacent to shoe 212 includes an annular ring 274, which extends radially inward from the cylinder sidewall. The protrusion 276 is fixed to the first cylinder 222 ′, and the annular ring 274 is
Into the central opening of the The protrusion 276 engages the annular ring 274 to pull the shoe 212 toward the support by movement of the actuator cylinder 266 toward the support 218, so that a head 278 having a diameter greater than the inner diameter of the ring 274 is engaged. Including. Annular ring 274 includes pressure equalizing holes 275 on either side of the ring. To assist in disassembly of the press, an annular ring 274 is
Removably screwed into 266. Projection 27
6 is also removably screwed into the first cylinder 222 '. The first cylinder 222 'includes a reinforcement boss 280,
A projection 276 is screwed therein. Shoe 212
Includes a recess 282 for receiving a boss 280. The depression 282 is larger in diameter than the boss 280, and as described above,
And 241 are exchanged for the first cylinder in the flow direction.
222 'can be moved.

The shoe retraction actuator 260 also has additional advantages in addition to the ability to retract the shoe 212. That is, if the fluid pressure in chamber 268 of actuator 260 drops below the pressure present in working chamber 234, the net load force exerted on shoe 212 is exerted when the pressures in chambers 234 and 268 are equal. More than one. Therefore, the actuator 260 can also be used to increase the load capacity of the load cylinder without increasing the size of the load cylinder.

FIG. 9 shows a sixth preferred embodiment of the load cylinder 320 according to the present invention. Load cylinder 320 is the first
Cylinder 322, which has a thick end wall 323 to which the protrusion 276 of the shoe retraction actuator 260 'is attached.
Therefore, the shoe 312 does not require a recess to accommodate the protrusion 276. As described above for the loading cylinder 220 ', the clamps 239 and 241 can be interchanged to move the first cylinder 322 in the flow direction. Further, the second cylinder 324 can be moved in the flow direction in a similar manner. For this purpose, the support
318 includes a recess 319 and a second cylinder 324 includes an end wall 325
On which the mandrel 26 of the actuator piston 262 '
4 'is fixed. The mandrel 264 'extends through the thickened portion 326 of the cylinder end wall 325, and the thickened portion 326 and a portion of the mandrel 264' extend into the recess 319 of the support 318. The depression 319 in the support 318 can be made wider in the flow direction than the thick portion 326 of the second cylinder 324 to move the second cylinder 324 in the flow direction. The second cylinder 324 includes a pair of asymmetric clamps 339 and 341
Thus, the first cylinder 322 is fixed on the support 318 in a manner similar to that mounted by the clamps 239 and 241 to the shoe 312. Therefore, the second
The cylinder 324 is moved in the flow direction by exchanging the clamps 339 and 341.

The pressurized hydraulic fluid is applied to the shoe pull-back actuator 260 'by the end wall 32 of the second cylinder.
It is supplied by a flexible hose which connects to the end 328 of the mandrel 264 'projecting from the thickened portion 326 of FIG. This method of providing fluid communication with the actuator piston 264 '
Of the cylinder 324 and the actuator 260 'in the flow direction are facilitated.

From the above description of several preferred embodiments of the present invention, it can be seen that the present invention does not require the loading cylinder to be restrained or malfunction as compared to conventional presses.
It is apparent that there is provided a unique shoe press that has significant advantages including resistance to deformation, such as thermal expansion of the shoe. The present invention further provides a simple mechanical device for adjusting the center of load on the shoe in the flow direction.

While the preferred embodiments of the invention have been described in considerable detail, the invention is not limited to these embodiments. Various modifications and equivalent substitutions will be readily apparent to those skilled in the art, and such modifications and substitutions are possible within the scope of the invention as set forth in the appended claims.

[0036]

Thus, the present invention provides a shoe press that supports a press shoe so that it can move freely in the width direction without wear, bending, or other undesirable effects on the load cylinder. provide. The loading cylinder can also regulate the deformation or parallel movement of the press shoe in the direction of flow and the pivoting of the press shoe about an axis parallel to the width direction. Further, the articulated load cylinder prevents the press shoe from taking an inclined position.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a press shoe according to a first preferred embodiment of the present invention in a plane parallel to the flow direction and passing through one axis of a load cylinder.

FIG. 2 is a view similar to FIG. 1, showing the press shoe pivoting with respect to a support about an axis parallel to the width direction.

3 is a sectional view of the press shoe of FIG. 1 in a plane parallel to the width direction and passing through the axis of the load cylinder.

FIG. 4 is a second preferred embodiment of the present invention having two rows of load cylinders spaced apart in the machine direction to impart a pivoting motion to the press shoe to change the nip pressure in the machine direction. It is sectional drawing similar to FIG. 1 which shows an example.

FIG. 5 is a view similar to FIG. 3, showing a third preferred embodiment of the present invention.

FIG. 6 is a view similar to FIG. 1 showing a fourth preferred embodiment of the invention having two pistons and a common cylinder;

FIG. 7 is a view similar to FIG. 1 showing one of the load cylinders of the fifth preferred embodiment of the present invention.

FIG. 8 is a view similar to FIG. 7, showing another one of the load cylinders including a built-in shoe pull-back actuator in a piston of the load cylinder.

FIG. 9 is a view similar to FIG. 8 showing a load cylinder according to a sixth preferred embodiment of the present invention;

FIG. 10 is a top elevational view of the shoe of the shoe press of FIG. 7 showing the pins and stops along the side edges and downstream of the shoe and limiting the movement of the shoe.

[Explanation of symbols]

 10 shoe press 12 press shoe 14 face of press shoe 16 backing member (counter roll) 18 support body 20 loading cylinder 22 first cylinder 24 second cylinder 26 piston 28 first end of piston 30 second piston End 32 of elastic compressible seal 34 First working chamber 36 Second working chamber 38 Passageway 40 Supply passage 42 Hole 44 Fastening device 46 Spherical surface 48 Guide rail or stop 50 Stop ring 52 Reduced diameter portion 54 Static pressure chamber 56 Tube 58 Passage

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Erik Blocks Sweden 667 33 Forschaga, Trollsteigen 20 (72) Inventor Rals Gustavusson Sweden 654 60 Karlstad, Huntvale Kargatan 33

Claims (29)

[Claims] 1. A shoe press for pressing a web conveyed in a flow direction through a nip between a shoe press and a backing member, wherein the nip is used in parallel with the backing member and is between the backing member and the shoe press. The web can be transported through
A press shoe that extends over substantially the entire width of the web; a support that movably supports the press shoe in a load direction toward the backing member and presses the web; and a width direction along the press shoe. A plurality of connected hydraulic load cylinders spaced apart from each other, each load cylinder including a piston member disposed in the cylinder member to form a working chamber pressurizable by hydraulic liquid, One of the member and the cylinder member is a first member fixed to the press shoe and the first member fixed to the support.
A two-piece member having a second member spaced from the first member and the other of the piston member and the cylinder member sealingly engaging both the first and second members. And pressurizing the working chamber to urge the first member away from the second member in the load direction to urge the press shoe toward the backing member, wherein each joint is a first and second member, respectively. , The seal pivoting the joint relative to the first and second members about an axis parallel to the flow direction, whereby the articulated hydraulic load cylinder is connected to the press shoe. Is moved in the width direction with respect to the support. 2. The shoe press according to claim 1, wherein said two-piece member is made separately and fixed to said press shoe and a support, respectively.
Wherein the coupling includes a piston, the piston including a first end received in the first cylinder, and a second end received in the second cylinder. A shoe press characterized by that. 3. The shoe press according to claim 2, wherein a first working chamber is formed between the first end of the piston and the first cylinder, and a second working chamber is formed between the first end and the first cylinder. A second working chamber is formed between the end of the second cylinder and the second cylinder, and each working chamber can be pressurized by a hydraulic fluid. 4. The shoe press according to claim 3, wherein said piston includes a passage connecting said first working chamber to said second working chamber to allow fluid communication therebetween. A shoe press characterized by: 5. The shoe press according to claim 4, wherein one of the press shoe and the support supplies a pressurized hydraulic liquid to the first and second working chambers. A shoe press characterized by including a road. 6. The shoe press according to claim 5, wherein the supply path is in the support. 7. The shoe press according to claim 2, wherein said piston includes a spherical surface and said piston includes said first piston.
A shoe press pivoted with respect to both the first and second cylinders. 8. The shoe press according to claim 2, wherein the first and second ends of the piston are respectively:
A shoe press for supporting an elastic compressible seal surrounding the piston and sealing an inner surface of a corresponding cylinder. 9. The shoe press according to claim 2, wherein each of said pistons is tubular and defines an opening therein, and further includes a hydraulic actuation disposed within at least one of said pistons. A shoe press, comprising: a shoe pull-back actuator, wherein the actuator is operable by hydraulic pressure and the shoe is pushed away from a counter roll. 10. The shoe press according to claim 9, wherein the shoe pull-back actuator is attached to the support and extends into the piston of the load cylinder, and seals the actuator piston. And an actuator cylinder surrounding the pressurized liquid, a chamber pressurizable by a hydraulic fluid is formed, and the actuator cylinder is propelled toward the support body. The actuator cylinder has a protrusion fixed to the press shoe. A shoe press, wherein said shoe press is pushed toward said support by engagement of said shoe pull-back actuator. 11. The shoe press according to claim 10, wherein the actuator piston includes a mandrel mounted on the support and normally projecting therefrom toward the press shoe, the mandrel being the shoe retraction actuator. A shoe press including a passage opening into an interior chamber, wherein the support has a hydraulic liquid supply passage communicating with the passage in the mandrel. 12. The shoe press of claim 8, wherein the piston includes a tubular member having a generally cylindrical inner and outer surface, the first and second of the piston.
Have respective annular flanges projecting radially outward beyond the cylindrical outer surface of the piston, each flange supporting one of the resiliently compressible seals. And shoe press. 13. The shoe press according to claim 12, wherein the first and second cylinders each have a cup-shaped member having end walls fixed to the press shoe and a support, respectively. A tubular portion connected to and extending toward the other cylinder, the tubular portions each forming a cylindrical inner surface that is sealingly engaged by one of the seals on the piston. A shoe press characterized by that. 14. The shoe press of claim 13, wherein the tubular portion of the second cylinder includes a stop member,
A shoe press extending radially inward to a smaller diameter than a flange on a second end of the piston to limit movement of the piston away from the support in the load direction. . 15. The shoe press of claim 1, wherein the loading cylinders are arranged in two rows, each row being spaced apart in the flow direction, one of the rows being the other of the loading cylinders. A shoe press, which can be pressurized by hydraulic pressure separately from the load cylinders in the row and changes the nip pressure in the flow direction. 16. The shoe press according to claim 1, wherein the joint includes a cylinder, the two-piece member includes a first piston fixed to the press shoe, and a second piston fixed to the support. A shoe press having a piston, wherein the cylinder surrounds both pistons in a hermetically sealed manner to form a common working chamber between the pistons. 17. The shoe press according to claim 1, further comprising an adjustable locking mechanism for locking the first member to the shoe, the locking mechanism including the first locking mechanism. A shoe press capable of adjusting the position of the member in the flow direction with respect to the shoe. 18. A shoe press for pressurizing a web conveyed in a flow direction through a nip formed between a shoe press and a backing member, wherein the shoe press is used in parallel with the backing member and is between the shoe back and the backing member. A press shoe extending in the width direction along the width of the web; a support for supporting the press shoe; and a floating member disposed between the support and the press shoe. Including a piston and first and second cylinders, including separately made first and second cylinders, wherein the first cylinder is fixed to the press shoe, and wherein the second cylinder is And the floating piston has opposing first and second ends slidably received and sealingly engaged within the first and second cylinders by hydraulic fluid. An articulation that forms a pressurizable first and second working chambers to urge the first and second cylinders away from each other in a load direction and to urge the press shoe toward the backing member. A hydraulic load cylinder, wherein the piston is a tubular member having a generally cylindrical inner surface and an outer surface, the first and second ends of the piston each having an annular flange; Project radially outward beyond the cylindrical outer surface of the piston, each flange supports an elastic compressible seal, which engages the inner surface of the respective cylinder, and the flanges are parallel to the flow direction. A shoe press, wherein the piston is pivoted with respect to each cylinder about a suitable axis. 19. The shoe press according to claim 18, wherein said first cylinder includes a recess formed in said press shoe. 20. The shoe press according to claim 18, wherein said first cylinder is made separately from said press shoe and is fixed to said press shoe. 21. The shoe press according to claim 18, wherein said second cylinder is made separately from said support and fixed to said support. 22. The shoe press of claim 18, further comprising a stop ring secured to said second cylinder and used to engage a flange on a second end of said piston; A shoe press for limiting movement of the piston away from the support. 23. The shoe press of claim 18, wherein each of said flanges has a spherical surface facing an inner surface of each cylinder to facilitate pivoting of a piston within said cylinder. Shoe press. 24. The shoe press according to claim 18, further comprising a hydraulically operated shoe retraction actuator disposed within said piston, said actuator being hydraulically operable to support said shoe. A shoe press propelled toward a body to limit movement of the shoe away from the support. 25. The shoe press according to claim 24, wherein the shoe pull-back actuator comprises: an actuator piston attached to the support and extending into a piston of the load cylinder; and sealing the actuator piston. An actuator cylinder that surrounds and forms a chamber that can be pressurized by the hydraulic pressure liquid and protrudes toward the support, and the actuator cylinder engages with a protrusion fixed to the press shoe, and A shoe press, wherein the shoe shoe is propelled toward the support by actuation of a shoe pull-back actuator. 26. The shoe press according to claim 25, wherein the actuator includes a mandrel mounted on the support and normally projecting therefrom toward the press shoe, wherein the mandrel is within the shoe retraction actuator. A shoe opening including a passage opening into the chamber, wherein the support has a hydraulic liquid supply passage communicating with the passage in the mandrel. 27. The shoe press of claim 20, further comprising an adjustable locking mechanism for locking the first cylinder to the shoe and actuating the locking mechanism to operate the shoe. Shoe press characterized in that the position of said first cylinder with respect to is adjustable in the direction of flow. 28. The shoe press according to claim 27, wherein the securing mechanism includes a clamp, the clamp securing the first cylinder on the shoe and a plurality of clamps on the shoe. A shoe press, wherein the shoe press is adjustable in position to adjust the position of the first cylinder on the shoe. 29. The shoe press of claim 28, further comprising a second adjustable locking mechanism to lock the second cylinder to the support, the second adjustable locking machine. A shoe press, wherein the apparatus includes a clamp for securing the second cylinder to a plurality of positions on the support to adjust the position of the second cylinder in a flow direction.