Rotor changing device for a refiner

Abstract

The invention relates to a device for treating fibrous material with a changing device which can be connected or is connected to a pivoting arm. The rotor can be moved out of the housing by way of the changing device, and maintenance work can be carried out. The changing device (50) has a connecting element (52) for connecting the rotor (33) to the changing device (50), and a drive for an axial movement of the rotor. The rotor can be held and can be pivoted out of the device, in particular the refiner, by way of the changing device and a pivoting arm.

Description

[0001] Rotor changing device for a refiner

[0002] The invention relates to a device for treating fiber material, in particular refiners, and a method for changing treatment tools on a rotor.

[0003] DE102020122645 A1 shows a refiner with two treatment gaps for fiber processing. A first and a second treatment tool are provided to form the treatment gaps, whereby these treatment tools cannot rotate. These treatment tools are referred to as static. A rotor equipped with treatment tools on both sides is arranged between these static treatment tools. For fiber processing, fiber suspension is passed through the treatment gaps. At least one of the statically arranged refining sets is arranged so that it can be axially displaced and adjusted. By moving this refining set, the width of the refining gap can be adjusted. Furthermore, the rotor is mounted on a shaft so that it can be axially displaced, so that the width of the refining gap can be adjusted by the supplied fiber suspension.

[0004] Refiners can process a variety of fibers. Tailored treatment tools, also known as fillings or refining sets, are available for the treatment of different fibers.

[0005] Changing the fillings in the refiner is necessary due to wear and tear, as well as for installing a filling that is tailored to the refiner's application. To do this, the cover of the refiner housing must be opened. A rotor changing device with a bolt is pivoted towards the rotor drive shaft and firmly connected to this shaft. The rotor assembly, also known as the rotor, can then be pulled axially onto the bolt. The rotor can now be pivoted out and then secured. DE 100 84 327 T1 discloses such a double-disk refiner with a maintenance arm. The maintenance arm is to be attached to the rotor hub to remove the rotor from the refiner housing.

[0006] Especially in double-gap refiners, disassembly of the centrally located rotor is necessary to access the filling located axially behind the rotor. These rotors typically weigh more than 75 kg. Moving the rotor can be problematic due to the weight alone. Furthermore, contamination of the shaft supporting the rotor can make axial movement of the rotor difficult.

[0007] The invention is based on the object of enabling a change of clothing in a device for treating fiber material in a comfortable, faster and safer manner.

[0008] The object is achieved by the device for treating fiber material having the features according to claim 1 and by the method according to claim 14. Further advantageous features are mentioned in the dependent claims.

[0009] The changing device according to the invention facilitates disassembly of the rotor for carrying out maintenance work, in particular the replacement of a treatment tool subject to wear. A connecting element for a firm connection of the rotor to the changing device is provided. The connecting element allows the rotor to be connected to the changing device before the rotor is disassembled. The rotor is thereby secured. In addition, the changing device has a drive. The drive makes disassembly of the rotor from a drive shaft easier. In particular, if the shaft-hub connections between the rotor and drive shaft are subject to noticeable wear, disassembly / sliding of the rotor on the drive shaft can be difficult. The drive supports disassembly of the rotor from the drive shaft.Since the rotor is already secured by the connecting element, it prevents it from falling, which contributes to increased safety. The drive is designed for axial movement of the rotor. The drive allows the rotor to be pulled off the drive shaft and pushed back onto the drive shaft. This makes disassembly considerably more convenient.

[0010] In one embodiment, the drive comprises a gear. The gear can be used to translate the movement or force introduced by the drive. With a motorized drive, a small drive can thus be used and provided. Particularly with a manual drive, this can facilitate manual operation or even make it possible. The gear preferably has a gear ratio in the range of 10 to 40. In a design with a threaded spindle, a thread pitch in the range of 3 mm to 7 mm has proven advantageous.

[0011] In one embodiment, a spindle gear is used as the transmission. The design of a spindle gear is very compact and provides a high gear ratio. This allows for convenient manual disassembly, even by one person alone.

[0012] In an alternative embodiment, a lever gear is provided as the gear.

[0013] Alternatively, a hydraulic cylinder-piston drive can be provided as the drive. Such cylinder-piston drives as linear drives can be operated with a pump and are available as compact units with a closed hydraulic circuit. This allows the rotor changing device to be provided as a compact unit.

[0014] It has proven advantageous that the drive is manual. This means that no power supply is required for the rotor changing device. Such manual drives are very robust. Furthermore, a faulty function can be easily detected during manual operation. In a particularly convenient embodiment, a motor drive is provided. Preferably, the drive of the device for treating the fiber material is used for a motor drive, with the gear of the rotor changing device converting the rotational movement of the drive into a linear movement for moving the rotor in the axial direction of the changing device.

[0015] It has proven advantageous for the changing device to be articulated, preferably pivotable, to the device housing. This allows the changing device to be mounted on and through the device, particularly in the case of a refiner, as a device through the refiner, and is always available for maintenance work. Service personnel do not need to bring heavy equipment with them for maintenance.

[0016] Alternatively, a changeover device can be attached to a swivel arm before maintenance is performed. This allows one changeover device to be used on multiple devices, thereby reducing the costs of maintaining the changeover device.

[0017] In a preferred embodiment, an axial guide is provided for the rotor. This axial guide allows the rotor to be guided linearly down from the drive shaft and also to be guided linearly during the changing device. In particular, the connecting element performs a linear movement during disassembly and assembly. The connecting element can also be designed to support the rotor. This enables a particularly simply constructed changing device. Alternatively, a bearing element, for example in the form of a bolt, can be provided for supporting the rotor in the changing device. In this case, only the force required for the axial movement of the rotor is required via the connecting element, with the holding force being provided by the bolt. This allows the connecting element to be designed to be more delicate.The force for the linear movement can then be applied in a decoupled manner for the axial movement of the rotor. The rotor can be slid along the drive shaft and the bolt. This allows for disassembly with very little effort.

[0018] In a preferred embodiment, the bolt is connected, preferably screwed, to the drive shaft of the refiner. This creates a flush connection without a step between the bolt and the shaft, which is advantageous for assembly / disassembly. Movement of the changing device during assembly / disassembly is also prevented. Alternatively, a locking mechanism for the pivoting movement could also be provided for a changing device connected to the device, such as a refiner, by means of a pivot arm.

[0019] In one embodiment, the changing device has a flange with elongated holes as a connecting element. The elongated holes allow for connection to the rotor without the need for prior positioning. This is advantageous in terms of handling.

[0020] It has proven advantageous to equip a refiner with a changing device according to the invention. It is also possible to retrofit refiners with the changing device according to the invention.

[0021] For particularly compact storage on the refiner, it has proven advantageous to attach the changing device to the refiner using a pivoting arm, whereby the pivoting arm can be pivoted into the plane spanned by the pivoting arm. The axial direction of the changing device preferably coincides with the plane of the pivoting arm. In a particularly advantageous embodiment, the pivoting arm comprises two arms, whereby the changing device can be positioned between the two arms when it is not being used for a rotor change.

[0022] The following procedure steps are required to change a set of clothing in a refiner: - The refiner housing is opened.

[0023] - The rotor is mounted on a drive shaft in the refiner. The rotor is either rigidly connected to the drive shaft or mounted on the drive shaft for axial movement. The rotor is released, allowing it to be moved off the drive shaft.

[0024] - The changing device is positioned in front of the rotor, usually swiveled

[0025] - The rotor is firmly connected to the connecting element. If a flange is provided as the connecting element, the rotor can be bolted to the flange, for example. If the flange has elongated holes, bolting is particularly easy. This secures the rotor, preventing it from falling off.

[0026] - Fixing the changing device so that only individual components of the changing device can move, but the changing device cannot move as a whole, in particular cannot move away from the refiner.

[0027] - Driving the rotor for a linear movement of the rotor with the bearing of the rotor being taken over by the changing device

[0028] - Swinging out the rotor.

[0029] The assembly previously hidden by the rotor and the assembly facing away from the changing device can then be replaced. For assembly, the steps must be performed in reverse order.

[0030] Further advantageous features of the invention are explained using exemplary embodiments with reference to the drawings.

[0031] Fig. 1 schematic representation of a rotor changing device according to the invention on a swivel arm in a refiner

[0032] Fig. 2 3D representation of the changing device from Fig. 1 on the

[0033] Swivel arm

[0034] Fig. 3 Refiner with changing device and rotor inside the

[0035] Housing Fig. 4 Refiner with changing device with rotor taken up by the changing device

[0036] Fig. 5 Refiner arrangement

[0037] Figure 5 shows a refiner assembly 2. The refiner assembly 2 comprises a refiner 1. The refiner 1 has a stock inlet for the fiber suspension to be treated and a stock outlet 13 for the treated fiber suspension. The refiner housing 21 comprises a housing cover 23. An adjusting device 9 for adjusting the gap width is arranged on the refiner cover. The adjusting device 9 can be used to adjust and set the axial position of a stator 29 arranged in the housing cover 23. A refiner drive 3 is connected to the refiner, in particular to a rotor 33 arranged in the refiner housing, via a gear 5 and a coupling 7.

[0038] The operation of a refiner arrangement 2 is described below. The fiber suspension enters the refiner housing 21 through the stock inlet 11 and, in the case of a refiner designed as a double-disk refiner 1 with a double gap 39, is distributed between the two refining gaps 37. The fiber suspension passes through a refining gap 37 from radially inside to radially outside. The fiber suspension is refined between the refining sets 27 on the rotating rotor 33 and the two stators 29 and leaves the refiner 1 through the stock outlet 13. The power is adjusted via the refining gap 37. The stator carrier 31 is displaced axially by the adjusting device 9. The width of the refining gap 37 and the absorbed power change as a result. The rotor 33 is mounted on an axially fixed shaft 25 and is freely movable in the axial direction. The fiber suspension can be distributed between the two grinding gaps 37 through openings in the rotor 33.Due to the floating arrangement of the rotor 33, the processing conditions for both refining gaps 27 are automatically adjusted. In the event of a loss of fiber suspension, the load is quickly relieved using the adjustment device 9. In the event of damage or wear, the refining sets require regular replacement. A changing device 50 is used for this purpose. A changing device 50 is described in more detail with reference to Figures 1 and 2.

[0039] The changing device 50 has a drive 51. Here, a spindle drive 63 with manual actuation is shown. The spindle drive 63 acts on an element guided by an axial guide, which is firmly connected to a bolt 75 for receiving the rotor 33. On the side of the axial guide facing away from the spindle drive 63, a flange 71, acting as a connecting element 52, is firmly connected to the axial guide 59. The flange 71 has elongated holes 73. The flange can be firmly screwed to the rotor using the elongated holes. For an axial movement in the axial direction 67 of the changing device 50, a force acting in the axial direction can be transmitted by means of the spindle drive 63 to the flange 71, provided as a connecting element 52, and thus to a rotor 33 connected to the flange 71. The flange 71 is arranged coaxially to the bolt 75, provided as a bearing element 60 for supporting the rotor.The bolt 75 can be firmly connected, here in particular screwed, to the drive shaft 25 of the refiner by a shaft connection 65. In the illustration, all screws are provided with reference numeral 70. For compact mounting of the changing device 50, a pivot arm 55 connected to the refiner housing 21 can be used. The pivot arm shown here comprises two arms 56. The changing device 50 can be pivoted between the two arms 56 of the pivot arm and thus forms a compact unit together with the pivot arm 55. The changing device 50, in particular the bolt 75, is connected to the arms 56 of the pivot arm 55 via a hinge. The pivot arm, in turn, is connected to the housing 21 of the refiner 1 via an articulated connection 53, as shown in Figures 3 and 4.

[0040] Figure 3 shows a changing device 50, with the bolt 75 for receiving and supporting the rotor 33 already folded out. Before the changing device 50 is pivoted in front of the rotor 33, the stop 35 is removed. The stop 35 is provided as an axial limitation for the rotor 33, which is floatingly mounted on the drive shaft 25. As shown in Figure 4, the changing device 50 is pivoted in front of the rotor 33. First, the flange 71 is screwed to the rotor 33 and the drive shaft 25 is screwed to the bolt 75. The rotor is already secured with the firm connection of the rotor 33 to the flange 71.

[0041] The drive 51 is now actuated, pulling the rotor 33 onto the bolt 75. The connection to the refiner drive shaft 25 is then released again, and the changing device 50 is pivoted. The rotor 33 is pivoted out of the refiner housing 21 by the changing device 50 and the pivot arm 55. The newly released grinding sets 27 can now be changed. The rotor 33 can then be pivoted again, and the rotor 33 can be repositioned in front of the refiner drive shaft 25. The bolt 75 is connected to the drive shaft 25. By actuating the drive 51, the rotor 33 is pushed onto the drive shaft 25. The connection to the flange 71 is released again, and the changing device 50 with the pivot arm can be pivoted back into its original position.The stop 35 is screwed back onto the drive shaft 25 and the housing 21 can be closed again or the front grinding sets 27 can be replaced beforehand, if not already done, or other maintenance work can still be carried out.

[0042] List of reference symbols > >

Claims

Patent claims 1. A device for treating fibrous material (1), the device comprising a housing (21) in which treatment tools (27) are arranged facing one another to form a treatment gap (37), one of the treatment tools (27) being arranged with a rotor (33) connected in a rotationally fixed manner to a shaft (25), and the housing comprising a pivotably mounted housing cover (23) and a pivot arm (55) for pivoting the rotor (33) out of the housing, characterized in that a changing device (50) is connected or connectable to the pivot arm (55), and the changing device (50) comprises a connecting element (52) for connection to the rotor (33) and a drive (51) for providing an axial movement of the rotor (33) for pulling the rotor off the shaft (25).

2. Device (1) according to claim 1, characterized in that the drive (51) comprises a gear (61), wherein the gear (61) preferably has a gear ratio of at least 10, preferably in the range of 10 to 40.

3. Device according to one of the preceding claims, characterized in that a spindle gear is provided as the gear (61), wherein the threaded spindle preferably has an axial height of 3 mm to 7 mm per spindle thread.

4. Device according to one of the preceding claims, characterized in that a lever gear is provided as the gear (61).

5. Device according to one of the preceding claims, characterized in that a hydraulic cylinder piston drive is provided as the drive (51).

6. Device according to one of the preceding claims, characterized in that the drive is a manual drive.

7. Device according to one of the preceding claims, characterized in that the changing device (50) can be coupled to a motor drive, preferably the refiner drive (3), for a motor drive in the axial direction (67).

8. Device according to one of the preceding claims, characterized in that the changing device (50) is connected to the housing (21) via a first and a second pivot axis.

9. Device according to one of the preceding claims, characterized in that an axial guide (59) is provided for the rotor (33).

10. Device according to one of the preceding claims, characterized in that the changing device (50) has a bearing element (60), preferably a bolt (75), for the rotor (33).

11. Device according to one of the preceding claims, characterized in that the changing device (50) has a flange (71) provided with elongated holes (73) as a connecting element (52) for connection to the rotor (33).

12. Device according to one of the preceding claims, characterized in that the device is a refiner.

13. Refiner according to claim 12, characterized in that the changing device (50) is connected to the refiner housing (21) via a pivoting arm (55), wherein the changing device (50) is preferably connected in an articulated manner to the pivoting arm (55) and is pivotable between two arms (56) of the pivoting arm (55).

14. Method of disassembling a rotor (33) of a refiner (1) with the following method steps: - Opening the refiner housing (21,23) - Loosening the rotor - Swivel the changing device (50) in front of the rotor (33) - Connect the rotor (33) to the connecting element (52) and fix the changing device - Driving the rotor in the axial direction of the changing device (50) for supporting the rotor by the changing device (50) - Swing out the rotor (33).

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