JP2001518574A - Shoe press for paper machine or cardboard machine - Google Patents

Abstract

(57) Abstract: A shoe press for a paper machine or a cardboard machine, comprising a press shoe (200), a counter roll (312), a paper or cardboard web (W), and a circulating flexible belt (311). ) Are provided with a press shoe and a counter roll for forming a nip (N) extending therebetween, and a hydraulic load cylinder (210) for pressing the press shoe against the counter roll. A first and / or a second, each arranged between a side facing the counter roll of the press shoe and between the opposite side of the press shoe and the load cylinder and adapted to be supplied with hydraulic fluid. (101; 201). In the longitudinal direction, at least one pipe (103; 203) detachably mounted on one side (104) of the press shoe for supplying the hydraulic fluid, and a through hole (108; 208) in the wall thereof. The through hole communicates with the duct (102; 202) at one end thereof, and the duct is formed in the press shoe. The ducts open at their other ends into the working chamber (201) of the load cylinder and / or into the first static pressure compartment and / or into the second static pressure compartment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

 The present invention relates to a shoe press for a paper / cardboard machine.

[0002]

[Prior art]

A shoe press apparatus generally includes a press shoe and a counter roll, and between these two elements, for example, dewatering in a press section of a paper machine,
A nip for processing a paper or cardboard web extends through the nip, which extends with a circulating flexible belt in a press section of a paper machine, often referred to as a press belt. . The shoe press device also generally comprises a pressure actuable piston and cylinder unit, which is arranged along the press shoe (in one or more rows in the longitudinal direction of the press shoe), The press shoe is adapted to be pressed against a counter roll (hereinafter referred to as a load cylinder), for example, EP 345 501 B2, DE-195 15 832 C1, and DE-44 09 31. See No. 6 C1.

[0003] Sometimes the shoe press also comprises a compartment located on the surface of the press shoe facing the counter roll, and in operation, a fluid under hydrostatic pressure to lubricate the belt For example, refer to EP-345501B2.

[0004] Furthermore, the shoe press has a compartment or pressure chamber between each load cylinder and the press shoe, which opens towards the press shoe and contains a fluid under static pressure during operation. . The pressure chamber transmits the pressure of the load cylinder to the press shoe to press the press shoe and acts to form a hydraulic fluid pad, see DE-195 15 832 C1. I want to.

[0005] Accordingly, the load cylinders, compartments / chambers described above are required to access hydraulic fluid. The compartment for the static pressure according to EP-345 501 B2 is pressurized by hydraulic fluid through a duct which is common to all the depressions, which duct is mounted in the frame device of the shoe press. It is bored horizontally in the longitudinal direction, and a throttle is provided between the bored duct and each compartment. The restrictors serve the purpose of making the pressure conditions in each compartment essentially independent of the pressure conditions in the other compartments. According to EP-345 501 B2, a load cylinder is pressurized by hydraulic fluid via a duct which is bored in a frame device of a shoe press. According to DE-195 15 832 C1, a bored duct is made and used in a shoeless frame device, which pressurizes the load cylinder with hydraulic fluid and also places the press cylinder between the press shoe and the load cylinder. Is intended to be pressurized with hydraulic fluid via a restriction.

[0006] Boring shoe press frame devices, often made of steel beams, to pressurize with hydraulic fluid is a complex and expensive procedure. Also, the formed duct will be invariant.

There is a need for a simpler and less expensive supply of hydraulic fluid to compartments / chambers and load cylinders.

According to the present invention, such a demand can be satisfied, and the supply of the hydraulic fluid to the load cylinder and the compartment / chamber is performed by the press shoe in the longitudinal direction (crossing direction of the paper machine) with respect to the press shoe. This is done via a pre-manufactured pipe which is removably mounted.

More specifically, a shoe press according to the invention has the features of claim 1 and the advantageous features of the dependent claims.

Among the essential advantages of the present invention, the following should be noted.

[0011] Low cost: pipes can be made in a cheaper manner compared to ducts that are precisely bored in the frame parts.

-It is easy and inexpensive to modify shoe presses with such pipes. For example, the diameter / diameter can be changed.

The material of the pipe is arbitrary; Various requirements can be taken into account, for example, thermal expansion and machining accuracy of the duct. Press shoes are often made of aluminum. Pipes can also be made of aluminum and can be manufactured in a simple manner by extrusion, in which case the pipes are manufactured with fixing means or contoured in some other way. Can be made.

[0014]

[Description of preferred embodiments]

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

All the figures are cross-sectional views showing a shoe press part which is indispensable for understanding the present invention, in which the press shoe is a single piece extending in the cross direction, while the load cylinder, the compartment It should be understood that there are preferably several chambers, pressure chambers, arranged in the longitudinal direction of the press shoe.

Referring first to FIG. The static pressure compartments 101, which are known per se, are arranged in rows above the press shoe 200, and each of the static pressure compartments is assembled by means of a duct 102 bored into the press shoe 200. To the press shoe (in this example, on the inlet side) 1 by means of a screw 105 which engages a screw hole 105 'of the press shoe. It is detachably attached to 104. Reference numeral 106 denotes a duct for supplying hydraulic fluid in the assembly pipe 103. The attachment of the assembly pipe to the press shoe is performed by means of an assembly pipe flange 107. The ducts 106 are each connected to the duct 102 by means of a throttle 108, which is a hole formed in the wall of the mounting pipe 103.

The screw 105 allows the assembled pipe 103 to be removed from the press shoe 200 and allows the different assembled pipe 103 to have a different restriction 108 / diameter or to be made of a different material. It is also possible to attach to.

According to FIG. 1, the working chamber 201 of the load cylinder 210 is also provided with a duct 20.
6 is supplied with hydraulic fluid from an assembly pipe 203 containing
2, the duct 202 is bored by the press shoe 200 and extends to the working chamber 201. The assembling pipe 203 is detachably attached to the longitudinal side edge 204 of the press shoe 200 (on the outlet side in this example) by means of a screw 205. A bore hole (restriction) 208 for each duct 202 is provided on the wall surface of the assembly pipe 203. In this example, a screw 205 is screwed into the assembled pipe flange 207 and is connected to the screw hole 205 'of the press shoe.

The counter roll, the paper / cardboard web and the circulating belt are denoted by reference numerals 312 and 312, respectively.
W and 311, and the shoe press frame is indicated by reference numeral 309. N indicates the extending nip of the shoe press, F indicates the press felt, which is present when the shoe press is inserted into the press section of the paper machine.

In the embodiment of FIG. 1, there is also a static pressure compartment or pressure chamber 211 between the frame 309 and the load cylinder 210, and more specifically, between the load cylinder piston 210A and the frame. I do. This pressure chamber 211 has a throttle 2
13 communicates with the working chamber 201 via a duct 212. Thus, duct 206 also supplies hydraulic fluid to pressure chamber 211. Code 214
Indicates a seal O-ring between the piston 210A and the cylinder of the load cylinder, and is formed in a recess 210B below the press shoe.

FIG. 2 illustrates a load cylinder 310 and a press shoe 300 applying the principles of the present invention.
And supplies a hydraulic fluid to the pressure chamber 301 between the two. Symbol 30
Reference numeral 8 denotes a throttle from a hydraulic fluid flow duct 306 in an assembly pipe 303 attached to one longitudinal side edge 304 of the press shoe. Duct 302 with bored duct portions 302 'and 302 "couples duct 306 and hydraulic fluid chamber 301 together. The detachable connection between assembly pipe 303 and press shoe 300 ,
Screw / screw hole connectors 305 and 305 'are shown.

Furthermore, reference numerals 325, 326, 327, 330, 340, 340 ', 35
For 0, 309, and 380, the working chamber of the load cylinder 310;
On the hydraulic fluid supply to this chamber (common horizontal duct 326 and independent vertical duct 327), piston in load cylinder 310, cylinder part of load cylinder 310, and cylinder part 340 for pressure chamber 301 , A screw for attaching the piston to a horizontal support beam associated with the frame device of the shoe press, and an O between the cylinder portion 340 of the load cylinder and the piston 330.
And a ring seal.

Reference numeral 336 indicates a gap between the side of the press shoe 300 facing the cylinder portion 340 of the load cylinder 310 and the opposite side of the cylinder portion 340, which gap during operation of the shoe press. Duct 302 and assembled pipe 30
Hydraulic fluid can be supplied through the pressure chamber 3 and the static pressure compartment 301, and the press shoe 300 is supported by floating, thereby preventing a jam. This is indicated by the arrow in the figure.

In FIG. 3, one and the same assembling pipe 403 similar to the previous embodiment is connected to one (on the inlet side in this example) of the press shoe 400 by means of screw / screw hole couplings 405 and 405 ′. And a static pressure compartment 401 between the circulating flexible belt (press belt) and the press shoe 400, and a pressure chamber 301 between the load cylinder 410 and the press shoe 400. Supply hydraulic fluid to both. Pipe 4 mainly for static pressure compartment 401
In addition to the throttle 408 on the wall of No. 03, the duct 4
The portion 402 ″ of 02 has a throttle 402A formed therein and opens into the pressure chamber 301, and the duct 402 in the press shoe further branches to the static pressure compartment 401.
02 ′. The supply of hydraulic fluid to the working chambers 425 of the load cylinders 410 is provided by means of horizontal ducts 426 formed in the pistons 410B of these cylinders (common for all load cylinders). , A vertical duct 427 extends. Reference numeral 410A indicates a cylinder portion of the load cylinder. The piston is attached to the support beam by means of a screw 450. Reference numeral 480 indicates an O-ring seal between the cylinder 410A and the piston 410B. An O-ring seal for the pressure chamber 301 is shown at 430.

In the example according to FIGS. 1 to 3, the assembly pipe for supplying hydraulic fluid is detachably attached to one or both longitudinal side edges of the press shoe. In the embodiment of the present invention shown in FIG. 7, an assembling pipe 503 for supplying hydraulic fluid is detachably mounted in a concave portion 520 on the side of the press shoe 500 facing the load cylinder. The assembly pipe 503 includes two ducts or bores 506 and 506 ′, and the duct 506 includes the assembly pipe 50.
3 extends through a static pressure compartment 501 on the side of the press shoe facing the counter roll 312 via a restrictor 508 and a duct 502 in the press shoe 500, while the other duct 506 'is restricted by a restrictor. Press shoe 500 through 508 '
And into the pressure chamber 511 between the load cylinder 510. The pressure chamber 511 includes a sleeve 510C coupled to a cylinder portion 510A of the load cylinder 510, in which the piston 510B of the load cylinder is received.
The opening 512 is connected to the working chamber 521 of the load cylinder 510, and a screw 513 is fixed to the piston 510B. The screw is provided with a head 514, which narrows the opening 512 when the load cylinder reaches the maximum stroke. Further, in this example, the assembled pipe 503 has a flange 507, so that the assembled pipe can be detachably mounted in the press shoe 500 (with the screw 50).
(5, screw holes 505 ').

The assembly pipes 103, 203, 403 and 503 can be supplied with hydraulic fluid from one or both ends of these pipes. Assembly pipe 103, 203
, 403 and 503 are preferably made of the same material as the press shoe, preferably aluminum (alloy), and the assembled pipe is advantageously extruded. The hydraulic fluid supply pipe to the assembly pipe 403 is indicated by reference numeral 411 in FIG.

It will be appreciated that it is not necessary to secure the assembled pipe by means of a screw fitting as described above. The fixing method / means can be varied within the scope of the invention, for example, the flange of the assembled pipe may be engaged in a groove formed in the press shoe. Alternatively, a different fixing device, such as a screw with a washer, is screwed into the press shoe outside the pipe flange, e.g. 207, such that the head of the screw tightens the pipe flange to the press shoe via the washer. I do. This device allows for a certain relative movement between the pipe and the press shoe, which is essential (from a thermal point of view) if, for example, the pipe was chosen to be made of a different material than the press shoe. As such, such an apparatus may be advantageous.

The straight mounting pipes described above are common for all hydrostatic compartments / pressure chambers and load cylinders, but more than one, ie a plurality of bore pipes / throttle / Hydraulic fluid is supplied via a duct to the compartment / pressure chamber /
It may be supplied to a load cylinder.

The shoe press of the present invention can also be applied to a calendar operation of a paper machine or a cardboard machine.

[Brief description of the drawings]

FIG. 1 shows an idea according to the invention for a static pressure compartment between a press shoe and a circulating flexible belt, a load cylinder and a static pressure compartment or pressure chamber between a load cylinder and a shoe press frame. It is explanatory drawing which applied.

FIG. 2 is an explanatory view in which the idea of the present invention is applied to a pressure chamber between a press shoe and a load cylinder.

FIG. 3 illustrates the idea of the present invention in a pressure chamber between a load cylinder and a press shoe, and
It is explanatory drawing applied to the static pressure division room between a press shoe and a circulation flexible belt.

FIG. 4 shows an idea of the invention in which a static pressure compartment between a press shoe and a circulating flexible belt (press belt), a pressure chamber between a load cylinder and a press shoe, and
It is explanatory drawing applied to the load cylinder.

──────────────────────────────────────────────────静 Open to the static pressure compartment and / or to the second static pressure compartment.

Claims (11)

[Claims] 1. A shoe press for a paper machine or a cardboard machine, comprising: a press shoe (200; 300; 400; 500); a counter roll (312); a paper or cardboard web (W) and circulation. A press shoe and a counter roll forming between them a nip (N) in which the flexible belt (311) extends, at least one hydraulic load cylinder (210; 310) for pressing the press shoe against the counter roll. 410; 510), and arranged respectively on the side of the press shoe facing the counter roll and between the opposite side of the press shoe and the load cylinder, adapted to be supplied with hydraulic fluid. The first and / or second static pressure compartments (101; 201; 301; 401;
211; 501; 511): in the longitudinal direction one side of the press shoe (104; 204; 304; 4).
At least one pipe (103; 203; 303; 403; 503) detachably mounted at 04) for the supply of said hydraulic fluid; a through hole (108; 208; 308; 408; 508) in its wall. 508 '
) A pipe formed in the press shoe, one end of which is in communication with the hole, respectively.
402; 402 '; 402 "; 502), the ducts at their other ends, respectively, the working chambers (201; 521) of the load cylinder and / or the first static cylinder. A shoe press open to a pressure compartment and / or the second static pressure compartment. 2. The shoe press according to claim 1, wherein the pipe is detachably attached to one longitudinal edge of the press shoe. 3. The shoe press according to claim 1, wherein the pipe is integrated with the press shoe facing the load cylinder and is detachably attached to the press shoe. 4. The shoe press according to claim 1, wherein the hole of the pipe has a shape of a throttle. 5. A duct according to claim 1, wherein a duct in the press shoe connects the bore of the pipe to at least a hydrostatic compartment on the side facing the counter roll of the press shoe. A shoe press according to any one of the preceding claims. 6. A duct according to claim 1, wherein the duct in the press shoe connects the hole of the pipe to at least a static pressure recess between the load cylinder and the press shoe. The shoe press described in the item. 7. The shoe press according to claim 1, wherein the duct in the press shoe connects the bore of the pipe to at least the working chamber of the load cylinder. 8. The mounting pipe (503) has two ducts or bores (506).
506 '), one of which is in communication with the static pressure compartment on the side of the press shoe facing the counter roll, and the other is the static pressure compartment between the load cylinder and the press shoe. The shoe press according to any one of claims 1 to 7, wherein the pipe is integrated with the press shoe under the press shoe. 9. The pipe according to claim 1, wherein the pipe is made of the same material as the press shoe, and is preferably made of aluminum (alloy).
The shoe press described in the item. 10. The shoe press according to claim 1, wherein the pipe is provided with a flange for attaching the pipe to the press shoe by means of a screw and a screw hole of the press shoe. 11. The pipe is provided with a flange for attaching the pipe to the press shoe by means of a screw and a washer, and the screw hole of the press shoe is arranged outside the flange, and the head of the screw passes through the washer. The shoe press according to any one of claims 1 to 9, wherein the flange is fastened to the press shoe.