Roller changing device

Abstract

Roll changing device (1) for removing a roll (110, 110') from a fiber web machine and / or for adapting a roll (110, 110') to the fiber web machine, which roll changing device (1) has a frame part (3) with a curved inner surface in cross-section and at least one support device (12) of the roll which is movably adapted to the frame part, characterized in that at least two planar support surfaces (8) parallel to the longitudinal direction of the frame part (3) are arranged on the curved inner surface of the frame part (3), which extend substantially from the first end of the frame part (3) to the second end, and that the support device (12) of the roll (110, 110') has a trolley (12) for carrying the roll (110, 110') which is equipped with wheels (14) on which the trolley (12) is movable on the support surfaces (8).

Description

Scope of the invention

[0001] The invention relates to a roll changing device according to the preamble of patent claim 1. Technical background

[0002] Fiber web machines, such as paper and board machines, contain numerous rollers that need to be removed and reinstalled, for example, for repairs. If the roller is located in the machine at a position that allows it to be lifted directly, for example, using an overhead crane, changing the roller is a relatively easy undertaking.

[0003] If the roller is located below the frame or under part of the frame, removal with an overhead crane is not possible, and various tools for removing and installing the roller have been developed for such situations. One such solution is the special roller changing beam located below the frame or part of it, and a carriage that can be adapted to transport the roller transversely from under the frame. The beam on the machine is solid because the entire weight of the roller is directed onto the center of the beam.

[0004] Replacing a so-called supported roll is particularly challenging because it cannot be supported anywhere on the shell except longitudinally in the center. Such a center-supported roll is shown in publication FI 115554 B.

[0005] Publication FI103996 B describes a method and device for removing a roll belonging to a paper / board or finishing machine from said machine or for installing it onto said machine. When the roll is in position in the paper / board or finishing machine, the device includes a support member extending longitudinally of the roll, formed into a channel-like portion, against which the structures already present in the machine or structures separately arranged for the support member are supported. A sliding carriage is shown for placement below the roll, between the roll and the support member, which is a water- or compressed-air-operated sliding mattress. This requires that the roll be supported on the shell during the changeover operation.

[0006] One problem with the solutions presented above is, among other things, that the beams present on the machine collect dirt during operation and even cause web breaks, and on the other hand, the heavy supporting part and / or the complicated construction of the sliding carriage. Description of the invention

[0007] The object of the invention is to improve the state of the art by presenting such a roll changing device of a fiber web machine with which the problems of the prior art are minimized.

[0008] This object of the invention is achieved mainly in the manner set out in independent claim 1 and in other claims.

[0009] The roll changing device for removing a roll from the fiber web machine and / or adapting the roll to a fiber web machine has, in cross-section, a curved frame part equipped with an inner surface and at least one support device for the roll which is movably attached to the frame part, in which at least two flat support surfaces are arranged on the curved inner surface and are parallel to the longitudinal direction of the frame part, which extend from the first end of the frame part substantially to the other end, wherein the support device for the roll has a trolley for supporting the roll, which is equipped with wheels on which the trolley can be moved on the support surfaces.

[0010] The roller changing device according to the invention is relatively light and easy to handle because the mass of the roller is directed toward the frame part when the roller is supported solely by the frame part. Furthermore, the space requirement is very small.

[0011] According to one aspect of the invention, the roll changing device has two trolleys for supporting the roll on the bearing housings.

[0012] According to one aspect of the invention, the trolley is equipped with a roller or bearing support having a curved inner surface having a bending radius that at least approximately corresponds to the bending radius of the outer surface of the bearing housing of the roller.

[0013] This means that the roller can be lifted onto the trolley safely and remains in place without any special measures.

[0014] According to one aspect of the invention, the supporting surfaces are formed by connecting a separate L-shaped profile bar to the curved inner surface of the frame part.

[0015] According to one aspect of the invention, the wings are formed on the inner surface of the frame part by shaping the inner surface of the frame part to form at least two planar wings.

[0016] According to one aspect of the invention, the wings are parallel to the frame part.

[0017] According to one aspect of the invention, a stopper for the trolley is arranged at the end of the wing.

[0018] The stopper prevents the trolley from accidentally moving outside the wings.

[0019] According to one aspect of the invention, the wheels have a radial guide projection extending past the wings at the inner ends of the wheels when the trolley has been placed or set up on the wings.

[0020] This ensures that the trolley runs smoothly on the wings.

[0021] According to one aspect of the invention, the roll changing device is used to change a roll supported in the center.

[0022] A method for removing the roll from a fiber web machine having a roll changing device comprises the following: a frame part curved in cross-section and having an inner surface and at least one support device of the roller, which is movably adapted to the frame part, in which on the curved inner surface of the frame part at least two flat supporting surfaces are arranged which are parallel to the longitudinal direction of the frame part and extend essentially from the first end of the frame part to the second end, and in which the support device of the roller comprises a trolley which is equipped with wheels on which the trolley is movable on the supporting surfaces, and wherein the trolley is equipped with a roller support whose shape is compatible with the shape of the bearing housing of the roller to be replaced, which process has the following phases: a. the roll changing device is brought to the roll, underneath, in the longitudinal direction in such a position that one end of the frame part of the roll changing device is arranged outside the roll shell, b. the roll changing device is suspended from one end of the frame part by means of the suspension device on the support of the roll, and the roll changing device is supported at the first end by means of the lifting device, and the roll changing device is moved near the roll in the longitudinal direction of the roll under the roll until the other end of the roll changing device passes the shell and the bearing housing of the roll, c. the roll changing device is supported on the support structure of the fiber web machine and the trolleys are placed on the transfer surfaces and positioned at the height of the roll bearing housings, d. the roller is lowered onto the trolley, e. the roll is moved to the first end of the roll changing device supported by the trolleys, the lifting device is connected to the end of the roll protruding from the fiber web machine and the roll head is supported on the support of the lifting device and the trolley is removed from under the bearing housing of the roll from the first end of the roll changing device. f. the roller is removed from the fiber web machine by pulling it using the lifting device, g. another lifting device is connected to the middle part of the roller, whereby the roller is supported with the first lifting device on the bearing housing and with the second in the middle of the roller shell and the roller is lifted out of the roller changing device.

[0023] The additional features and properties characteristic of the invention are apparent from the appended claims and from the following description of the embodiments of the figures.

[0024] The main advantages of the invention are its efficiency and simplicity. Drawings

[0025] In the following, the invention and its function are explained by referring to the enclosed schematic figures in which Fig. 1 is a side view of the part of the fiber web machine for which the roll changing device according to the invention is intended, Fig. 2 schematically shows an embodiment of the roll changing device according to the invention, Fig. 3 the end of the roller changing device and the trolley from Fig. 2 in more detail, Fig. 4 process phases when removing the roller from the fiber web machine, and Fig. 5 the other end of the roll changing device and the suspension of the roll changing device Fig. 2 shows the installation phase in more detail. Explanation of the drawings

[0026] In Fig. Figure 1 shows a side view of the forming section 100 of a fiber web machine, which forming section is formed here from two fabric loops 120, 121. Suitable machine elements 130 and fabric guide rollers are arranged for the routing and drainage of the fabric loops. For example, the roller 110' is in a position that requires tools in addition to the bridge crane of the machine hall for removing the roller. Particularly in such a position, the roller is preferably a so-called center-supported roller, wherein the roller shell is supported longitudinally in the center by means of an internally arranged support structure. The bending properties of such a roller differ from those of rollers usually supported at the ends, but this design also increases the mass of the roller.The roll changing device according to the invention shown here is particularly suitable for the removal and installation of such a roll supported in the center, because the roll can practically not be supported anywhere else on the shell except in the center.

[0027] In Fig. Figure 2 shows an embodiment of the roll changing device 1 according to the invention. The roll changing device 1 comprises a frame part 3, which is an elongated piece. The length of the frame part is greater than the length of the roll it is intended to change. The frame part has a first end 3.1, which is intended to remain on the drive side of the fiber web machine when the changing device is in use. The frame part also has a second end 3.2, which is intended to extend to the drive side of the fiber web machine when the roll changing device is located in the fiber web machine. At one end 3.2 of the frame part is a first support / fastening part 5, by means of which the roll changing device 1 can be fastened on the drive side, for example, to the frame of the fiber web machine or to another support structure.The frame part has a second support / fastening part 7, which is arranged in the area between the first and second ends, approximately 200 - 1000 mm from the first end 3.1 of the frame part. By means of the second support / fastening part 7, the roll changing device 1 can be supported on the driver side, for example, on the foundation plate of the fiber web machine. The first and second support / fastening parts 5, 7 can be designed depending on the requirements of the respective application, for example, so that they can be identical. When the roll changing device 1 has been installed in position for roll changing in the fiber web machine, it extends a distance D outside the fiber web machine. The frame part 3 is bent from the cross-section in the transverse direction with respect to the longitudinal direction.On the curved inner surface of the frame part 3, at least two planar support surfaces 8 are arranged, which are parallel to the longitudinal direction of the frame part and which extend essentially from the first end 3.1 of the frame part to the second end 3.2. The support surfaces 8 are preferably parallel to the frame part 3, wherein the trolley described later can run along the support surfaces. With the help of the support surfaces 8, the rotation of the roller during roller changing is prevented. According to one embodiment, the support surfaces are formed by connecting a separate L-profile bar to the curved inner surface of the frame part in such a way that both edges of the profile are fixed to the frame part, as in . Fig. 2. As a second practical embodiment, the support surfaces 8 can be formed on the inner surface by shaping the inner surface of the frame part 3 and forming at least two planar support surfaces 8. The frame part is preferably made from a plate by bending it into a channel shape, which can simply be called a channel. Perimeter stiffeners 10, such as bands, can be fitted to the frame part 3 at its ends 3.1, 3.2 and at the level of the fastening part 7.

[0028] The roll changing device 1 comprises the roll as a carrying device, wherein the roll is to be movably carried on the frame part 3 of the roll changing device 1, and two preferably identical trolleys 12, of which in Fig. 2 only one is shown. The trolley comprises wheels 14, of which there are preferably four - two pairs of wheels, one of which is arranged at the first end of the trolley and the second at the other end, seen in the direction of travel of the trolley. The wheels 14 comprise a radial guide shoulder 15 which extends at the inner ends of the wheels past the supporting surface 8 into the region of the guide edge when the trolley is placed on the supporting surfaces. The guide shoulder is a collar, preferably formed at one end of the wheel, which is arranged inwards during installation in the trolley. This ensures that the roll change takes place linearly in the transverse direction of the machine.

[0029] The wheels of the wheel pair are preferably parallel. The distance between the wheels 14 of the wheel pair is substantially the same as the distance between the support surfaces 8. The trolley 12 can be moved relatively easily on the support surfaces 8 by means of the wheels. In this way, the support surfaces form rails for supporting and moving the trolley in the roll changing device 1. The trolley 12 and the roll can be moved using a suitable pulling or supporting device. Preferably, the roll changing device is equipped with a fixed pulling device 17 at the first end 3.1 of the frame part, with which the roll can be moved when it is supported in the roll changing device 1. The pulling device is preferably a winch equipped with a pulling cable or the like.The pulling device can also be easily detached from the frame part, whereby the same pulling device can be used, for example, in roll changing devices of different sizes.

[0030] The roller can be supported on the trolley by means of the bearing housings, wherein the trolley 12 is equipped with a roller support 16 whose shape is compatible with the shape of the bearing housings of the roller to be changed. The roll changing device comprises two trolleys 12 for supporting the roller by means of both bearing housings on the frame part 3. The roller support 16 of the trolley 12 is arranged on the trolley on the opposite side of the wheels 14, wherein, when the roll changing device is in operation, the roller support 16 opens upwards. The roller support preferably comprises a curved inner surface having a bending radius that almost corresponds to the bending radius of the outer surface of the bearing housings of the roller, whereby the roller easily remains in position when supported by the bearing housings on the trolley 12.The trolley 8 moves on support surfaces, and when the trolley approaches the end of the support surface, the support surface has a stopper or projection extending upward from the support surface at least at the first end 3.1. The stopper 18 ensures that the trolley 12 is not accidentally pulled out of the roll changing device 1.

[0031] In Fig. 3 is the end of the Fig. 1, in which the roller 110 has been lowered onto the roller support 16 of the trolley 12 such that it is supported on the trolley by the bearing housings 102. When the curved surface of the roller support 16 corresponds to the round outer surface of the bearing housing, the roller is easy to lower onto the trolley and remains reliably in position. Suitable flexible material is provided on the surface of the roller support, against which the bearing housing is supported.

[0032] In Fig. 4, partial figures a - f, the removal of a roll from the fiber web machine using the roll changing device 1 according to the invention is shown. In Fig. Figure 4a shows the first working phase. In this phase, the roll 110 is still attached to the frame of the fiber web machine. The roll changing device 1 is brought to the roll 110, below, in the longitudinal direction of the roll, in such a position that one end 3.2 of the frame part of the roll changing device 1 is located in the area of ​​the roll shell. The roll changing device is lifted at the first end and approximately in the middle with the lifting devices, leaving the other end free to be brought to the roll shell; this situation is shown in Fig. 4a. Mounting eyes 20 are arranged on the frame part 3 near the other end 3.2, on the outer surface of the frame part, on the opposite edges. The roll changing device 1 is attached to the roll 100 by means of the suspension device 22 such that the suspension device 22 is guided over the roll shell and secured to the mounting eyes 20 from both ends. Fig. Figure 5 illustrates the construction of one end and the suspension device of the roll changing device in more detail. The suspension device 22 can be, for example, a steel cable 24 or equivalent, to which a number of pulleys are attached. The length of the suspension device 22 is such that the roll changing device 1 hangs relatively close to the roll. If the roll changing device is trough-shaped, it requires only a small amount of space around the roll. After attaching the suspension device, the roll can be suspended in the middle. A number of pulleys 26 are attached to the steel cable 24, allowing the roll changing device to run smoothly by supporting the roll surface.

[0033] In the next phase, which will be Fig. As shown in Figure 4b, the roll changing device is supported at the first end 3.1 of the frame part 3 by means of the lifting device (e.g., bridge cranes in the machine shop), and at the other end 3.1 of the frame part, the roll changing device is located on the support of the roll 110 by means of the suspension device 22. The roll changing device is moved longitudinally under the roll when it is close to the roll. During this phase, the other end 3.2 of the roll changing device passes the edge of the roll shell and the bearing housing. The fastening eyes 20 are located at such a distance from the other end 3.2 of the frame part 3 that the roll changing device can be guided past the roll shell when it is supported by the roll by means of the suspension device 22.

[0034] In Fig. 4c shows the next working phase, in which the roll changing device 1 is supported on the fiber web machine by means of the first support / fixing part 5 and the second support / fixing part 7 on the support device and the trolleys 12 are placed on the suspension of the transfer surfaces 8 and positioned in the longitudinal direction of the roll to the height of the bearing housings of the roll so that the roll can next be lowered on the support of the trolleys, which in Fig. 4d is shown.

[0035] In Fig. Figure 4d shows a situation in which the roll changing device 1 is supported by being attached to the support structures of the fiber web machine, and the roll is lowered onto the trolleys 12. During lowering, the roll can be supported on the frame structures of the fiber web machine, for example, using slings or a crane. Once the roll 110 has been lowered onto the support of the trolleys 12 present in the roll changing device 1, the next phase begins with transporting the roll 110 toward the guide side of the fiber web machine or the first end 3.1 of the frame part of the roll changing device, using and supporting the trolleys in the roll changing device. The traction device 17 integrated into the roll changing device can be used for transporting.

[0036] In Fig. Figure 4e shows a phase in which the roller 110 has been moved to the first end 3.1 of the roller changing device, and to which the end of the roller located outside the fiber web machine is attached to a lifting device 30. When the roller end is supported by the lifting device, the trolley 12 below the bearing housing at the first end 3.1 of the frame part 3 can be removed. Now, when the roller is supported on the lifting device at the end of the driving side, it is pulled further out of the fiber web machine with the aid of the lifting device, with the other end, that of the driving side, still supported by the trolley 12 in the roller changing device; this situation is shown in Fig. 4f. If the middle section of the shell is located outside the fiber web machine, another lifting device 30 is connected to the middle section, whereby the roll is supported by the first lifting device 30 on the bearing housing and by the other lifting device 30 in the middle of the roll shell. This is shown in Fig. 4g. Now, the roller 110 can be completely lifted out of the fiber web machine using the lifting devices and transported to the desired location.

[0037] The roller is installed in the same way in the opposite order.

[0038] It should be noted that only some of the most advantageous embodiments of the invention have been presented above. It is therefore clear that the invention is not limited to the embodiments presented above, but can be applied in many ways within the scope of the appended claims. The properties presented in the context of the various embodiments can also be combined in other embodiments and / or in sets different from the properties presented, within the scope of the basic idea of ​​the invention, if desired and the technical possibilities exist. List of reference symbols: 100 Forming section of a fiber web machine 102 bearing housings 110 roller 120,121 fabric loops 130 machine organ 110, 110' center supported roller 1 roller changing device 3 frame part 3.1 first end of the frame part 3.2 second end of the frame part 5 first support / fastening part 7 second support / fastening part 8 wing 10 Circumferential stiffening 12 trolley 14 slices 15 leadership carriers 16 roller support 17 Towing device 18 stoppers 20 fastening eyelets 22 Suspension device 24 steel cable 26 roll 30 lifting device QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] FI 115554 B

[0004] FI 103996 B

[0005]

Claims

[1] Roll changing device (1) for removing a roll (110, 110') from a fiber web machine and / or for adapting a roll (110, 110') to the fiber web machine, which roll changing device (1) has a frame part (3) with an inner surface curved in cross-section and at least one support device (12) of the roll, which is movably adapted to the frame part, characterized by that at least two planar support surfaces (8) are arranged on the curved inner surface of the frame part (3) and are parallel to the longitudinal direction of the frame part (3), said support surfaces extending substantially from the first end of the frame part (3) to the second end, and that the support device (12) of the roller (110, 110') has a trolley (12) for supporting the roller (110, 110'), which trolley is equipped with wheels (14) on which the trolley (12) can move on the support surfaces (8). [2] Roll changing device (1) according to claim 1, characterized bythat the roller changing device (1) has two trolleys (12) for carrying the roller on bearing housings (102). [3] Roll changing device (1) according to claim 1 or 2, characterized by that the trolley (12) is equipped with a roller support (16) having a curved inner surface having a bending radius that at least approximately corresponds to the bending radius of the outer surface of the bearing housing (102) of the roller (110,110'). [4] Roll changing device (1) according to claim 1, characterized by that the supporting surfaces (8) are formed by connecting a separate L-profile bar to the curved inner surface of the frame part (3). [5] Roll changing device (1) according to claim 1, characterized by that the supporting surfaces (8) are formed on the inner surface of the frame part (3) by shaping the inner surface of the frame part (3) and forming at least two planar supporting surfaces (8). [6] Roll changing device (1) according to claim 1, characterized by that the supporting surfaces (8) are parallel to the frame part (3). [7] Roll changing device (1) according to claim 1, characterized by that a stopper (18) for the trolley (12) is arranged at the end of the wings (8). [8] Roll changing device (1) according to claim 1, characterized by that the wheels (14) have a radial guide projection (15) arranged at the ends of the wheels and extending past the supporting surface when the trolley (12) is placed on the supporting surfaces. [9] Roll changing device (1) according to one of the above claims, characterized by that it is used for changing a roller (110') supported in the center.

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