Fabric insertion unit for fiber web machine and motor unit therefor

Abstract

The invention relates to a fabric insertion unit used in a fiber web machine and a motor unit thereof. The motor unit (26) includes: a hollow roller shell (27); roller ends (29) on both ends of the roller shell (27); and a bracket (30) for the two roller ends (29). The motor unit (26) further comprises bearings (33) located on both ends of the roller shell (27) allowing rotation of the roller shell (27) relative to the bracket (30). Further, the motor unit (26) includes a motor (34) disposed inside the roller shell (27) and connected to the roller shell (27). The motor (34) is non-rotatably fixed to the bracket (30) at one end, and the bearing (33) is an outer bearing (35) between the motor (34) and the roller end (29), and the bearing (33) is an inner bearing between the roller end (29) and the bracket (30) at the other end.

Description

Technical Field

[0001] The present invention relates to a motor unit for a fabric insertion unit in a fiber web machine, the motor unit comprising: a hollow roller shell; roller ends, which are located at both ends of the roller shell; brackets, which are used for the two roller ends; bearings, which are located at both ends of the roller shell and allow the roller shell to rotate relative to the brackets; and a motor, which is arranged inside the roller shell and connected to the roller shell. The present invention also relates to a fabric insertion unit for a fiber web machine. Background Art

[0002] Chinese patent application publication number CN108221451 discloses a fabric insertion unit, which is a device for changing fabric in a fiber web machine. The fabric insertion unit comprises two relatively arranged transfer devices, which include lifting means. Each transfer device comprises a frame with two roller shells, which support a metal belt arranged in an annular shape. The metal belt is moved by rotating one or both roller shells with a motor. When the relative metal belts move, the fabric moves between them. In the known motor unit, the motor inside the roller shell rotates with the roller shell. Before use, the metal belt is aligned and tightened by moving the bracket relative to the frame with a large bolt or two small bolts. Finally, the bracket is fixed in place.

[0003] This known arrangement is complex, expensive and difficult to manufacture and install. In particular, the installation of pipes through the end flanges of the bracket is problematic due to the rotation. A rotating connector is required and the connector itself requires space, which must be taken into account in the surrounding structure. Furthermore, it has been found that the arrangement is prone to leaks. One large bolt requires a lot of space, as does the tool itself. But still, sufficient force cannot be obtained. Only a small force can be obtained with two smaller bolts. It is also difficult to tighten the small bolts evenly. Uneven tightening can cause the bracket to distort. Summary of the invention

[0004] The object of the present invention is to provide a motor unit for a fabric insertion unit in a fiber web machine, which is more durable than before and is also easier and quicker to assemble and maintain. The features of the motor unit according to the invention are as follows. By means of the new structure, a rotary connector can be dispensed with and there are fewer leak-prone joints. Furthermore, the assembly of the motor unit is easier and the metal belt can be tightened with a precise and reasonable force. Another object of the present invention is to provide a new fabric insertion unit in a fiber web machine, which is more reliable and easier to maintain than before. The features of the fabric insertion unit according to the invention are as follows. Leakages of fluids and pressures can be avoided and, if necessary, the functioning of the fabric insertion unit can be easily corrected. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] The present invention is described in detail below with reference to the accompanying drawings, which show some embodiments of the present invention, in which:

[0006] Figure 1 shows an example of a body of a press section of a fiber web machine viewed from the side,

[0007] Figure 2a shows a complete fabric insertion unit ready to be attached to a fiber web machine,

[0008] Figure 2b shows a vertical section through a motor unit according to the invention,

[0009] Figure 3 A horizontal section through another motor unit according to the invention is shown. DETAILED DESCRIPTION

[0010] Figure 1 An example of a press section of a fiber web machine, viewed from the tending side, is shown. The press section comprises a frame 10, which has several beam structures 11 and 12. The load is supported in particular by vertical beams, which can also be inclined. Here, the press section has two presses 13, each of which has two fabrics 14. The fabrics 14, which form an endless loop, are supported by rolls 15. The rolls are supported on the frame 10. Each fabric has to be replaced from time to time. Fiber web machines are, for example, paper machines, cardboard machines and pulping machines and belt calenders with replaceable fabrics. For example, the closed fabric loop comprises a wire on the web forming part and a felt and a belt on the press section of a fiber web machine.

[0011] In the embodiment shown, several fabric insertion units 16 are arranged on the operating side in the frame 10. A "fabric insertion unit" will be referred to as a "unit" in the following. The unit is used to change fabrics on a web forming machine and the unit is intended to be installed in the frame 10 of a web forming machine. Figure 1 In general the cells 16 are shown. In addition to the cells 16, the frame 10 also comprises spacers 17 which are removed when the fabric 14 is replaced.

[0012] Figure 2aA unit 16 according to the invention is shown disassembled from the frame of a fiber web machine. The unit 16 comprises two oppositely arranged transfer devices 18 for moving the fabric 14. Furthermore, the unit comprises a lifting device 19 for forming a transfer channel for the fabric 14 between the transfer devices 18. In practice, the transfer channel enables the fabric to pass through the frame of the fiber web machine. Furthermore, each transfer device 18 comprises a frame 20, which is adapted to be part of the lifting device. Furthermore, each frame is attached to the fiber web machine with a plurality of bolts 21. The lifting device functions by means of a pressurized fluid. For this purpose, the frame 20 has an internal channel for the fluid provided in the lifting device 19. The fluid is supplied to the internal channel via an inlet 22 and the fluid flows out via an outlet 23. When the unit is installed, suitable pipes are attached to the inlet and outlet.

[0013] exist Figure 2a In the embodiment shown in Figure 1, the units 16 are in production position and the transfer devices 18 are connected to each other on both edges by locking devices 24, here eye bolts. The locking devices prevent the frames from moving relative to each other during production and keep the frames together despite vibrations and loads. During production, an intermediate structure 25 is located between the frames, carrying the load from one frame to another.

[0014] When the fabric is changed, the locking device 24 is released. Then, the distance between the transfer device (more specifically, the frames of the transfer device) is increased using the lifting device. In practice, a sufficient lift is 0.5 mm to 10 mm. In this case, the frames are separated from each other, so that the intermediate structure 25 can be removed. In this way, a transfer channel is formed between the frames, so that the fabric can be transferred using the transfer device.

[0015] As described above, the lifting device is arranged as part of the frame of the transfer device. More specifically, the lifting device comprises a pressure chamber located in the frame and defined by a pressure water seal. The seal has a rectangular perimeter with rounded corners and defines the pressure chamber together with a metal belt ring supported by a deflection roller. The deflection rollers are attached to the frame and have a motor unit in one or more of the deflection rollers.

[0016] Advantageously, a fluid (for example water) is fed into the pressure chamber, which fluid simultaneously lubricates the seal sliding against the metal strip without contaminating the environment. Figure 2a As shown in , both frames have the same kind of channels and the lifting devices function identically.

[0017] Figure 2b and Figure 3A motor unit 26 for a fabric insertion unit in a fiber web machine is shown. The motor unit 26 comprises a hollow roller shell 27, which is the main part of a turning roller supporting a metal belt 28. Then, on both ends of the roller shell 27 there are roller ends 29 and brackets 30 for the two roller ends 29. The roller ends 29 are fixed to the roller shell 27 with bolts 31. Each bracket is bolted to the frame 20 with two screws 32. The motor unit 26 also comprises bearings 33 on both ends of the roller shell 27, allowing the roller shell 27 to rotate relative to the brackets 30. Then, a motor 34 is arranged inside the roller shell 27 and connected to the roller shell 27. The roller shell is rotated by the motor and thereby the metal belt is moved.

[0018] According to the present invention, at one end of the roller shell 27, the motor 34 is non-rotatingly fixed to the bracket 30, and the bearing 33 is an outer bearing 35 located between the motor 34 and the roller end 29. In other words, the motor is fixed. At the other end of the roller shell 27, the bearing 33 is an inner bearing 36 located between the roller end 29 and the bracket 30. In the outer bearing, the outer ring rotates with the roller end, while the inner ring is fixed. Correspondingly, in the inner bearing, the inner ring rotates with the roller end, while the outer ring is fixed. With this construction, there is no need to use the known rotary connector that reduces the possibility of leakage. During use, the motor remains in place when the roller shell rotates. The construction of the motor unit becomes simpler and cheaper than before. The manufacturing speed is also accelerated. In addition, errors in function are also reduced, and oil leakage will be extremely rare.

[0019] The motor 34 is connected to the opposite roller end 29 via an output shaft 37. Here, the output shaft 37 is a spline shaft 38 inserted into an output axle 39 in the motor 34. The spline shaft accommodates thermal expansion and allows for angular errors. The motor itself can be a standard motor, which reduces manufacturing costs and maintenance costs. Here, the motor 34 is equipped with a flange shaft 40, which is fixed to the bracket 30 as an extension. The flange shaft 40 is part of the motor 34 and supports the outer bearing 35. In addition, the flange shaft 40 has a supply duct 41 for the motor 34. In this way, there are no pipes inside the motor unit that are prone to leakage. As mentioned earlier, the motor 34 is a standard hydraulic motor. The supply duct 41 has a coupling 42 for hydraulic supply.

[0020] like Figure 2b As shown in the figure, the diameter of the roller end 29 is greater than the diameter of the roller shell 27. In this way, the metal strip is prevented from slipping off the roller shell. In other words, the roller end acts as a guide. In practice, however, the deflection rollers are aligned in such a way that the metal strip will behave well (stay inline) and will not squeeze the roller end.

[0021] In contrast to the known art, each bracket is moved indirectly by means of an adjusting bolt 43. In practice, the bracket 30 has an inclined surface 44 for a key 45, which is attached to the frame 20 by means of said adjusting bolt 43. Less power is thus required and the adjusting bolt 43 is easily accessible from the side of the frame. More precisely, the key 45 has the adjusting bolt 43 with the same orientation as the roller shell 27. When the adjusting bolt 43 is tightened, the key 45 moves towards the frame 20, while pressing the bracket outwards, as Figure 3 Accordingly, when the adjusting bolt 43 is loosened, the key 45 comes out and the bracket 30 can move toward the frame 20. In this way, the metal band 28 is loosened.

[0022] Advantageously, the key 45 is double-sided. In other words, the frame also has a corresponding inclined surface for the key. The key therefore performs well (maintains the formation). With the key, only half the force is required. In fact, even one adjusting bolt is sufficient to tighten the metal belt sufficiently. At the same time, the adjustment is playless and stepless (smooth). Now, the size of the key determines the accuracy of the adjustment instead of the spiral rise of the adjusting bolt. This helps to align the steering roller. In fact, since the required displacement is only a few millimeters, the angle of the key is 1 to 10 degrees. By changing the size of the key, the displacement of the bracket can be easily increased.

[0023] Advantageously, the key 45 has a different hardness than the bracket 30, or the key 45 is made of a different material than the bracket 30. In this way, the key will slide easily without getting stuck. The key can be, for example, brass, copper or plastic, and it can also be coated.

[0024] like Figure 2a As shown in , the bracket 30 has two attachment lugs 46, between which the inclined surface 44 is arranged. In other words, the key 45 is located between the attachment lugs 46. Therefore, when the key is tightened, the bracket will move in a straight line. In this way, any misalignment of the bracket is prevented.

[0025] In the fabric insertion unit, there are two or four motor units. Figure 2a The unit has four motor units, since there is a hydraulic supply in each deflection roller. The motor unit according to the invention is also easy to retrofit. Thus, currently used fabric insertion units can be equipped with motor units with fixed motors. Some minor modifications to the frame may be necessary due to the presence of the key. The other fluids and hydraulic supplies can remain unchanged.

Claims

1. A motor unit for a fabric insertion unit in a fiber web machine, the motor unit (26) comprising: A hollow roller shell (27), Roller ends (29), the roller ends being located at both ends of the roller shell (27), a support (30) for the two roller ends (29), bearings (33) located at both ends of the roller shell (27) to allow the roller shell (27) to rotate relative to the bracket (30), and a motor (34) arranged inside the roller shell (27) and connected to the roller shell (27), Characterized in that at one end the motor (34) is non-rotatably fixed to the bracket (30), and the bearing (33) is an outer bearing (35) located between the motor (34) and the roller end (29), and at the other end the bearing (33) is an inner bearing (36) located between the roller end (29) and the bracket (30).

2. The motor unit according to claim 1, characterized in that The motor (34) is connected to the opposite roller end (29) via an output shaft (37).

3. The motor unit according to claim 2, characterized in that The output shaft (37) is a spline shaft (38) inserted into the output shaft (39) of the motor (34).

4. The motor unit according to any one of claims 1 to 3, characterized in that The motor (34) is equipped with a flange shaft (40) fixed to the bracket (30) as an extension.

5. The motor unit according to claim 4, characterized in that The flanged shaft (40) has a supply duct (41) for the motor (34).

6. The motor unit according to any one of claims 1 to 5, characterized in that The motor (34) is a standard hydraulic motor.

7. The motor unit according to any one of claims 1 to 6, characterized in that The diameter of the roller end (29) is greater than the diameter of the roller shell (27).

8. The motor unit according to any one of claims 1 to 7, characterized in that The bracket (30) has an inclined surface (44) for a key (45).

9. The motor unit according to claim 8, characterized in that The key (45) has a different hardness than the bracket (30), or the key (45) is made of a different material than the bracket (30).

10. The motor unit according to claim 8 or 9, characterized in that The key (45) is double-sided.

11. The motor unit according to any one of claims 8 to 10, characterized in that The bracket (30) has two attachment lugs (46) between which the inclined surface (44) is disposed.

12. A fabric insertion unit for a fiber web machine, the fabric insertion unit (16) being arranged to be mounted in a frame (10) of the fiber web machine, and comprising two oppositely arranged transfer devices (18) for transferring a fabric (14), and further comprising a lifting device (19) for forming a transfer channel for the fabric (14) between the transfer devices (18), wherein the transfer device has a frame (20) having one or two motor units (26), each motor unit comprising: A hollow roller shell (27), Roller ends (29), the roller ends being located at both ends of the roller shell (27), a support (30) for the two roller ends (29), bearings (33) located at both ends of the roller shell (27) to allow the roller shell (27) to rotate relative to the bracket (30), and a motor (34) arranged inside the roller shell (27) and connected to the roller shell (27), Characterized in that at one end the motor (34) is non-rotatably fixed to the bracket (30), and the bearing (33) is an outer bearing (35) located between the motor (34) and the roller end (29), and at the other end the bearing (33) is an inner bearing (36) located between the roller end (29) and the bracket (30).

13. The fabric insertion unit according to claim 12, characterized in that The motor unit (26) is a motor unit according to any one of claims 2 to 11.

14. The fabric insertion unit according to claim 12 or 13, characterized in that: The bracket (30) is bolted to the frame (20) and has a beveled key (45) between the bracket (30) and the frame (20).

15. The fabric insertion unit according to claim 14, characterized in that The key (45) has an adjusting screw (43) which has the same orientation as the roller shell (27).

Images