FI82501B - Method and arrangement in a paper machine - Google Patents

Abstract

The invention relates to a method in a paper machine, especially in its press section for changing a woven fabric, such as a felt, that forms a closed loop. In the method an intermediate piece 11 is used, which absorbs press loads in frame beams R, T of the paper machine, which are transferred from a closed position to a position in which a space A is opened for the frame beams, though which space the woven fabric, such as a felt, for example, is introduced. In the method the intermediate piece is rotated about the central shaft 1 of the cylinder arrangement 21 from the closed position to a position S2, from which it can be raised to an upper position S3 by means of a cylinder arrangement 21, an intermediate space A being formed between the frame parts R1 and R2. Before the intermediate piece 11 is transferred from position S1 to position S2 the upper frame R1 is raised with a cylinder arrangement 21 and the intermediate piece 11 is raised with the upper frame R1. The intermediate piece 11 can thereby be easily swung from position S1 to position S2, from whence it can be raised to the upper position S3, an open intermediate space A being formed between the frame parts R1 and R2. The invention also relates to an arrangement according to the method. <IMAGE>

Description

82501

The invention relates to a method for changing a closed loop-forming fabric, such as a felt, in a paper machine, in particular in its press section, which method uses press-load-receiving snacks in the frame beams of a paper machine, which are moved from the closed position to the closed position. wherein a space 10 is released in the frame beams through which a tissue, such as a blanket, is placed and the snack is rotated about the central axis of the cylinder device from a closed position to a position from which it can be raised by the cylinder device before the snack is moved from position 15 to position 15, the upper body is raised by a cylinder device.

The invention further relates to a device for applying the method defined above.

As is known, the body of a paper machine is provided with removable spacers which are removed when changing a felt or other fabric. Applicant's previous FI patent 57 456 discloses a method and device in which a snack in the closed position is rotated about an axis substantially perpendicular to the end planes receiving the compressive loads of the snack to a position from which the snack can be raised to the space releasing position. In this lifting of the snack, a cylinder device mounted on the frame beam is used.

It is an object of the invention to provide an improvement on the above method and apparatus.

The difficulty of the above-mentioned method is, in particular in the case of heavy snacks, the turning of these snacks to the position preceding the lifting position on the cylinder 35. In known snack bars, curved guides have to be used to perform this pivoting shift before lifting by the cylinder. The use of curved guide surfaces is an expensive solution.

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The invention has been able to avoid the above-mentioned problems with a solution which uses a separate shoulder abutment part attached to the cylinder device and a snack comprising a separate 5 sleeve part and a shoulder part resting on the lower surface of the body therein.

Using a cylinder device, the snack can be lifted off its base part. In this case, the snack is turned without the snack having a large bottom surface in contact with the base part. This solution also allows the use of straight guide surfaces, because in this turn-10 shift, the snacks do not have to be controlled by curved guide surfaces. During this turn, the snack is slidably supported by the shoulder part of the sleeve part of the snack in the upper body part R 1. The shoulder part is located close to the pivot axis X. Thus, in the pivoting of the snack, the resistive torque caused by friction remains small.

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The method according to the invention is mainly characterized in that when the upper body is lifted by a cylinder device, a snack is lifted with the upper body, whereby the snack can be easily pivoted from a position from which it can be lifted to an upper position, forming a free space between the body parts.

The device according to the invention is mainly characterized in that the device comprises a sleeve associated with a snack, the central passage of which; the cylinder arm of the cylinder device and the abutment portion connected thereto are passed through the opening, the sleeve comprising a flange or the like at its upper end. -30 when the shoulder of the abutment part of the blade arm engages with the shoulder of the sleeve during lifting, whereby the sleeve passed through the opening below the body can be raised to the upper position.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings 35, to which, however, the invention is not intended to be exclusively limited.

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Figure 1 is a schematic side view of a press section of a paper machine in which the method and apparatus according to the invention have been applied.

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Figure 2 shows a paper machine seen from the machine direction.

Figure 3 schematically shows the formation of an intermediate space according to the invention.

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Figure 4 is an axonometric view of the means for engaging the snack.

Figures 5A-5D show the method according to the invention step by step.

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Figure 6 shows a snack with a straight guide edge.

Figure 7 shows the snack of Figure 6 raised.

Figure 1 is a side view of the press section of a paper machine. This press section has the snacks 11 of the vertical beams R of the body in the closed position. In order to clarify the application of the invention, the main components of the press part shown in Fig. 1 are listed below. The forming wire is indicated by reference numeral 12. From this wire 12, the web is taken from pick-up roller 25 and felt 13 and transferred to felt 14 which leads to a nip formed by its press rolls 15 and 16 which is double felt and its upper felt is indicated by reference numeral 17. The press roll 15 forms a second press nip with the press roll 18.

30 The vertical beams of the press body are marked with the reference letter R and the horizontal beams are marked with the reference letters T.

M As shown in Fig. 2, the frame comprises protruding portions 19a, 19b, 19c supported during the formation of intermediate spaces Α ,, Α ^ Α, by rods 20a, 20b, 20c.

Fig. 2 shows a step of forming the intermediate space, in which intermediate spaces A1, Aj and Aj are formed in the vertical body R and in which stage the snacks 11 are raised. The blanket can be taken from the spaces C ,, C2 and C3 through the intermediate spaces A ,, A, and Aj to the place of exchange and use.

Figure 3 is a schematic axonometric view of the formation of intermediate space A according to the invention. A snack 11 is arranged between the upper body part R, and the lower body part Rj of the press section of the paper machine. When the intermediate space A is formed, the space between the body parts R 1 and Rj is divided by a cylinder device 21, , about a pivot axis X and a cylinder-10 around the blade arm to position S2. From this position, the snack 11 can be raised by the cylinder device 21 to the upper position S3, whereby the intermediate space A is formed. The blanket or other tissue of the paper machine can then be introduced into use between the body parts R1 and R1.

Figure 4 shows a snack movement device according to the invention in an axonometric view and before the assembly of the parts. The apparatus comprises a cylinder device 21, preferably a hydraulic cylinder. The cylinder blade device 21 comprises a cylinder body 21a and a cylinder arm 21b.

.. 20 The central axis of the cylinder arm 21b is marked with the letter X. The snack: '· 11 comprises a plate-shaped straight portion 11b, and the edge portions 11b2 at the ends of the straight portion. The snack has an opening 22 and threads in the middle. - 23.

The sleeve 24 is attachable to the snack piece 11 in the threads 23 of its opening 22 from its counter-threads 25.

The sleeve 24 comprises a central through-opening 26 with a first portion 27 and a second portion 28 having a diameter greater than 30 of the first portion 27. A shoulder 29 is formed between these portions. The sleeve 24 further comprises a flange V 30 at its R-side end.

At the end of the piston rod 21b of the cylinder device 21, a sleeve-like abutment portion 31 can be inserted by means of a threaded connection: According to the invention, the cylinder arm 21b and the abutment portion 31 attached thereto are adapted to move

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5 82501 freely inside the sleeve 24 of the snack 11 in the space 26 and in such a way that only the shoulder 29 of the sleeve 24 restricts the upward movement of the stop part 31. The abutment portion 31 comprises a first portion 31a and a second portion 31b having a larger diameter relative thereto, the second portion 5 having a larger diameter is located at the outermost end of the cylinder arm 21b - abutment portion 31. A shoulder 32 is formed between said portions 31a and 31b, which is adapted to rest against the shoulder 29 of the sleeve 24 when the snack 11 is lifted by the cylinder 21.

Figure 5A shows the device according to the invention assembled and connected to the vertical frames R1 and R1 of a paper machine. Based on Figures 5A-5D, the method according to the invention will be described in more detail below.

Fig. 5A shows a step in which the body R rests on the vertical walls 11b2 of the snack 11 on the lower body Rj. The cylinder device 21 is arranged in the hollow interior G of the upper body R. The handles 11a fixed to the vertical walls 11b2 of the snack 11 are in a position where the snack can be gripped.

20; ; Fig. 5B shows a step in which the cylinder device 21 is moved so that the stop part 31 engaging the end of the cylinder arm 21b of the cylinder cover 21 is adapted to press with force against the lower body Rj. At this point, the upper body R rises, as indicated by the arrows L, and 25 because the snack 11 comprises a sleeve 24 and contains a flange 30, the snack 11 also rises with the upper body R. Thus, the snack 11 is lifted off the lower body R 1.

The snack on the handles 11a is then turned from position S, to position S2 30 about the axis X. This turning is easy to perform because the only force that resists movement is between the flange 30 and the upper body R. · Sliding friction. However, the resistance torque remains small because the flange 30 is located relatively close to the pivot axis X.

Fig. 5C shows the step in which the turning from position S to position S2 is performed. The walls 11b2 of the snack 11 are in a position in which they can settle 6 82501 around the side surfaces of the upper body R.

Fig. 5D shows a step in which the cylinder device 21 has the spacer 11 raised to the position S3, whereby the intermediate space A is formed. The sleeve 24 of the intermediate piece 5 is lifted into the inner space G through the opening E of the body R, the shoulder 32 of the abutment portion 31 engaging the cylinder arm 21b of the cylinder device 21 moves against the shoulder 29 of the sleeve 24. Figures 5A-5D illustrate the introduction of arrow hydraulic oil into the actuator 21.

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Figure 6 shows an embodiment of the invention in which the snack 11 comprises straight guide edges 33.

The snack 11 is located in the compression between the bodies R 1 and R 2. In the prior art solution 15, these guide parts were curved, because when the snack was turned, the bottom part of the snack 11 slid along the lower body Rj. In this solution according to the invention, when raising the snack 11, the above-mentioned curvature of the guide groove is not required.

The turning of the snack is possible if, when the snack is pressed between the frames R1 and Rj, there is a distance t between the lower surface of the flange 30 and the surface R, 'adjacent to the cavity G, which must be greater than the height y, t> of the guide part. y.

Fig. 7 shows the snack 11 of Fig. 6 in the raised position and at the stage of being turned from the position S to the position S2. Due to the lifting from the base Rj, the snack piece 11 can be freely pivoted about the axis X, although the guide edges 33 are straight both in the snack piece 11 and in the frames R 1 and R 2. The clearance t also makes the upper body R, 30 detached from the guide edges 33 above the snack 11, because when the upper body R is raised, the cylinder device 21 only begins to carry the flange 30 after the distance t.

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Claims (3)

1. A method of a paper machine, especially at its pressing portion for replacing a tissue, such as a ridge forming a closed loop, in which method one uses spacers (11) that receive pressure loads in the paper beams' beams (R, T), which are transmitted from the closed position to such a position where a space (A) is opened to the beams, through which space the tissue, e.g. a blanket is brought into place and by which method the intermediate piece is rotated about the central axis (1) by the cylinder device (21) from the closed position to a position (S2) from which it can be raised to an upper position (S3) by means of of a cylinder device (21), forming a space (A) between the body parts (R, and R 2), and in the process before transferring the intermediate piece (11) from position (S) to position (S2) is raised. the upper body (R,) up with a cylinder device (21), characterized in that, when raising the upper body (R)), the spacer (11) lifts with the upper body (R,), the spacer (11) ) can be easily pivoted from closing position (S,) to position (S2), from which it can be raised to the upper position (S5), forming an open space (A) between the body parts (R, and R 2). 2. A method according to claim 1, characterized in that the method uses a separate intermediate piece (11) where there is one; sleeve (24), through whose central passage opening (26) can be inserted a locking member (31) attached to the cylinder shaft (21b) of the cylinder device (21), the hoist (24) comprising a flange (30) at the end which is on the side of the body (R), supported by which the flange spacer (11) can be released from the lower body (Rj) while the piston shaft (21b) of the cylinder device (21) presses the lower body (R its locking member (21), the upper body rising in a manner according to the arrow (L,). Apparatus for carrying out the method according to claims 1-2, which apparatus comprises a spacer (11) between the body parts (R 1, R 2) of the papermaker, which spacer can be pivoted from the closed position (S,) to an intermediate position ( S2) about the central shaft (X) of the cylinder shaft (21b) of the cylinder device (21), characterized in that the device comprises a sleeve (23) which connects to the intermediate piece (11), via whose central passage opening (26) the cylinder shaft ( 21b) of the cylinder assembly (21) and the locking member (31) connected thereto, the sleeve (24) including a flange (30) at its upper end, raising the upper body (R) of the cylinder assembly (21) lift off the intermediate piece (11) from the lower body (R), while the flange (30) is slidably coupled to the upper body (R), whereby the intermediate piece (11) can be easily pivoted about the shaft (X) by the cylinder (21) to intermediate position (S2) and after this it can is lifted up with the cylinder device (21) while the abutment (32) of the locking part (31) of the cylinder shaft (21b) is coupled during lifting to the stop (29) of the sleeve (24), the sleeve (24) continuing through the lower opening ( E) of the body (R,) can be lifted up to an upper position (S,) (pi Lj). Il