Disc-type rotor and method for repairing a disc-type rotor

Abstract

To provide a technology enabling easy maintenance work of a disk type rotor and an attachment work of a disk type rotor to a rotation drive shaft.SOLUTION: A disk type rotor 1 for a treatment machine which at least disintegrates a foreign matter from a stock of a papermaking stock, includes a boss 10 which is relatively unrotatably and detachably attached to a rotation drive shaft 133 of a treatment machine 100, and a rotor blade 20 attached to the boss 10 in a manner that disassembly can be done.SELECTED DRAWING: Figure 3A

Description

Technical Field

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[0001] The present invention relates to a disk-shaped rotor and a method for repairing the disk-shaped rotor.

Background Art

[0002] Conventionally, when manufacturing paper, cardboard, fiberboard, etc. from waste paper as a raw material in a pulp mill or the like, a disintegration and filtration device for separating the papermaking raw material into a raw material containing high-quality fibers and foreign substances such as plastic and sand is known (for example, see Patent Document 1).

[0003] In a pulper de-trashers, for example, water is injected into a container into which a papermaking raw material containing a large amount of waste paper with a high proportion of foreign substances is charged. At the bottom of the container, a rotor for promoting the mixing and stirring of the stock and a screen plate for filtering the stock slurry are provided.

[0004] The rotor in Patent Document 1 is assembled rotatably with a rotor cover covering the upper end portion of the rotation shaft. The rotor has four stirring vanes (vane portions) extending in the radially outward direction from the center of rotation (rotation shaft).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] When repairing the vane portion of a rotor, the rotor must be removed from the rotating shaft, and build-up welding must be performed again on the leading edge of the vane portion. However, in the case of a steel rotor, for example, the heat generated during the welding process can deform the boss portion through which the rotating shaft is inserted.

[0008] It is extremely important that the rotor and the rotating shaft are mounted concentrically to each other, and when attaching the rotor to the rotating shaft at the boss section, it is necessary to adjust them so that their axes align. After repair, the boss section through which the rotating shaft is inserted may be deformed, so when reinserting the repaired rotor onto the rotating shaft, even if the rotor and rotating shaft were mounted concentrically to each other before the repair, it will be necessary to adjust them again to mount them concentrically.

[0009] Therefore, the present invention aims to provide a technology that facilitates the repair work of disc-type rotors and the installation work of disc-type rotors onto a rotating drive shaft. [Means for solving the problem]

[0010] To solve the above problems, the present invention provides a disc-type rotor for a processing machine that separates foreign matter from raw materials in papermaking raw materials, characterized by comprising a boss that is detachably and non-rotatably mounted on the rotational drive shaft of the processing machine, and a rotor blade that is detachably mounted to the boss. [Effects of the Invention]

[0011] The present invention makes it possible to easily repair and replace rotors, as well as to attach rotors to the rotating shaft. [Brief explanation of the drawing]

[0012] [Figure 1] This diagram schematically shows the configuration of a pulsed dethrasher to which the disc-type rotor according to the present invention is applied. [Figure 2] This is a cross-sectional view of the stirring section along the rotating drive shaft. [Figure 3A] Perspective view of the disk-type rotor according to this embodiment. [Figure 3B] Cross-sectional view taken along line B-B in FIG. 3A. [Figure 3C] Exploded perspective view of the disk-type rotor according to this embodiment. [Figure 4A] Cross-sectional view of the boss along the axis. [Figure 4B] Plan view of the boss seen from the side of the cap. [Figure 4C] Plan view of the boss seen from the side of the rotor blade. [Figure 5A] Cross-sectional view of the wear plate along the axis. [Figure 5B] Plan view of the wear plate seen from the direction of arrow B in FIG. 5A. [Figure 6A] Cross-sectional view of the rotor blade along the axis. [Figure 6B] Plan view of the rotor blade seen from the direction of arrow B in FIG. 6A. [Figure 6C] Plan view of the rotor blade seen from the direction of arrow C in FIG. 6A. [Figure 7A] Perspective view of the bushing. [Figure 7B] Plan view of the bushing seen from the direction of B in FIG. 7A. [Figure 7C] Cross-sectional view of the bushing taken along line C-C in FIG. 7B. [Figure 8A] Plan view of the cap seen from the outside. [Figure 8B] Cross-sectional view taken along line B-B in FIG. 8A. [Figure 9] Flow chart showing the steps of the method for repairing the disk-type rotor.

Mode for Carrying Out the Invention

[0013] First, a general overview of a typical embodiment of the present invention will be given. In the following description, as an example, reference numerals on the drawings corresponding to the components of the invention are indicated in parentheses.

[0014] [1] The present invention relates to a disc-type rotor (1) for a processing machine that separates foreign matter from raw materials in papermaking raw materials, characterized in that it comprises a boss (10) that is detachably attached to a rotary drive shaft (133) of a processing machine (100) so as not to rotate relative to it, and a rotor blade (20) that is detachably attached to the boss (10).

[0015] [2] In the disc-type rotor (1) described above, the boss (10) has a cylindrical body portion (11) that is concentrically mounted on the rotating drive shaft (133), and the rotor blade (20) may have an annular mounting portion (21) that is concentrically mounted to the body portion (11) along the circumference of the body portion (11) and detachably attached to the body portion (11), and at least one vane portion (22) that extends outward from the mounting portion (21).

[0016] [3] In the disc-type rotor (1) described above, when attached to the processing machine (100), the boss (10) may have a removable annular plate (14) on the surface (11a) facing the processing machine (100).

[0017] [4] Furthermore, the present invention is a processing machine (100) that separates foreign matter from raw materials in papermaking raw materials, characterized by comprising a disc-type rotor (1) as described in any one of [1] to [3] above.

[0018] [5] Furthermore, the present invention is a method for repairing a disc-type rotor (1) as described in any one of [1] to [3] above, characterized in that it includes a removal step (S1) of removing the disc-type rotor (1) from the rotating drive shaft (133), a disassembly step (S2) of disassembling the boss (10) and the rotor blade (20), and a repair step (S3) of repairing the rotor blade (20).

[0019] [6] In the repair step (S3) of the method for repairing the disc-type rotor (1) described above, the rotor blade (20) may be repaired by attaching a predetermined jig to an annular mounting portion that is mounted concentrically along the circumference of the boss of the rotor blade.

[0020] [7] The repair step of the method for repairing the disc-type rotor (1) may further include a replacement step (S4) in which an annular plate (14) attached to the surface of the boss (10) facing the processing machine (100) is replaced with a new annular plate (14).

[0021] Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of the elements may differ from reality. Even between drawings, there may be differences in dimensional relationships and ratios.

[0022] The disc-type rotor 1 according to the present invention is used in a pulp dethraser 100 (processing machine) that separates foreign matter from the raw material in the papermaking material. However, the apparatus to which the disc-type rotor 1 according to the present invention is applied is not limited to the pulp dethraser 100, and it can also be used in a screen apparatus that separates papermaking material into papermaking material containing good quality fibers and papermaking material containing foreign matter.

[0023] Figure 1 is a schematic diagram showing the configuration of a pulp de thrasher 100 to which the disc-type rotor 1 according to the present invention is applied. The pulp de thrasher 100 includes a container 110, a stirring unit 120, and a drive unit 130. The container 110 includes a supply port 111 and a reject port 112.

[0024] Papermaking raw materials are supplied to the container 110 from the outside through the supply port 111. The papermaking raw materials supplied through the supply port 111 are fed from the bottom to the top of the container 110 to the stirring section 120 by a pressure pump (not shown). After stirring, a portion of the papermaking raw materials containing foreign matter is discharged to the outside of the container 110 through the reject 112.

[0025] The stirring unit 120 is located at the top of the container 110. The stirring unit 120 includes a tank 121 and a screen box 122. The screen box 122 is located at the top of the tank 121. The screen box 122 has a discharge port 123. Papermaking raw materials stirred in the stirring unit 120, described later, that contain high-quality fibers separated from foreign matter are sent through the discharge port 123 to, for example, a paper machine.

[0026] The screen box 122 is separated from the tank 121 by a screen plate (not shown). In the tank 121, the papermaking raw material pumped from the container 110 is separated by a disc-type rotor 1 (described later) into foreign matter and papermaking raw material containing high-quality fibers separated from the foreign matter. The papermaking raw material containing high-quality fibers, further sorted through the screen plate, is sent into the screen box 122.

[0027] The drive unit 130 includes a drive motor 131, a transmission belt 132, a rotating drive shaft 133, and a disc-type rotor 1. The transmission belt 132 is engaged with one end of the motor shaft (not shown) of the drive motor 131, for example, via a pulley. The transmission belt 132 is formed, for example, as an endless V-belt and is wrapped around a pulley on the motor shaft side and a pulley on the rotating drive shaft 133 side.

[0028] The rotary drive shaft 133 rotates due to power transmitted from the drive motor 131 via the transmission belt 132. Figure 2 is a cross-sectional view of the stirring section 120 along the rotary drive shaft 133. The tip of the rotary drive shaft 133 passes through the screen box 122 and enters the tank 121. A disc-type rotor 1 is attached to the portion of the rotary drive shaft 133 that enters the tank 121.

[0029] Figure 3A is a perspective view of the disc-type rotor 1 according to this embodiment. Figure 3B is a cross-sectional view along line BB in Figure 3A. Figure 3C is an exploded perspective view of the disc-type rotor according to this embodiment. The disc-type rotor 1 comprises a boss 10, a wear plate 14, rotor blades 20, a bushing 30, and a cap 40. When the disc-type rotor 1 is mounted on the rotary drive shaft 133, the cap 40, boss 10, and rotor blades 20 are connected to each other in that order from the screen box 122 side.

[0030] The disc-type rotor 1 for the pulp dethrasher 100, which separates foreign matter from the raw material in the papermaking raw material according to this embodiment, is characterized by comprising a boss 10 that is detachably and non-rotatably attached to the rotation drive shaft 133 of the pulp dethrasher 100, and a rotor blade 20 that is detachably attached to the boss 10. The configuration of the disc-type rotor 1 will be described in detail below.

[0031] Figure 4A is a cross-sectional view of the boss 10 along axis x2. Figure 4B is a plan view of the boss 10 as seen from the side of the cap 40. Figure 4C is a plan view of the boss 10 as seen from the side of the rotor blade 20. The axis x2 passing through the center of the disc-type rotor 1 is coaxial or substantially coaxial with the rotation axis x1 of the rotation drive shaft 133 when the rotor is mounted on the rotation drive shaft 133.

[0032] The boss 10 is a component that is attached to the rotary drive shaft 133 via a bushing 30, which will be described later, so that it cannot rotate relative to it. The boss 10 is formed in a cylindrical shape that is circular or substantially circular in plan view. The boss 10 has a main body portion 11 and a flange portion 12.

[0033] The main body 11 is made of a metal such as steel. The main body 11 has an insertion portion 13 that is formed concentrically with the rotation axis x2. The tip of the rotation drive shaft 133 is inserted into the insertion portion 13 when the disc-type rotor 1 is attached to the rotation drive shaft 133 (hereinafter also referred to as the "attached state").

[0034] In the installed state, the insertion portion 13 has a protruding portion 13a on the side of the drive unit 130. The protruding portion 13a is a part that extends from the inner circumferential surface of the main body portion 11 toward the rotation axis x2, and has an opening 13b formed in the center around the rotation axis x2. The diameter of the opening 13b is set to be smaller than the diameter of the insertion portion 13 and larger than the diameter of the rotary drive shaft 133.

[0035] The protruding portion 13a has, for example, 12 holes 13c formed in the circumferential direction. The holes 13c are formed as blind holes, spaced equally apart in the circumferential direction. Screw threads are formed on the inner circumferential surface of the holes 13c. The tip of the bolt B1 (see Figure 3B) for connecting the bushing 30, which will be described later, to the boss 10 is screwed into the holes 13c. The number of holes 13c is not particularly limited.

[0036] The protruding portion 13a has an annular projection 13d that protrudes toward the rotor blade 20 when installed. The annular projection 13d extends along the edge of the opening 13b. In addition, for example, six holes 11b are formed in the circumferential direction on the end face 11a of the main body portion 11 on the rotor blade 20 side. The holes 11b are formed as blind holes and are equally spaced from each other in the circumferential direction. The tip of the bolt B2 (see Figure 3B) for connecting the wear plate 14, which will be described later, to the boss 10 is screwed into the holes 11b. The number of holes 11b is not particularly limited.

[0037] The inner circumferential surface of the main body portion 11 is formed to be inclined so that it moves away from the axis x2 as it moves away from the protruding portion 13a along the axis x2.

[0038] On the end face 11c of the main body 11 opposite to the protruding portion 13a, for example, six holes 11d are formed in the circumferential direction. The holes 11d are formed as blind holes, spaced equally apart in the circumferential direction. The tip of the bolt B3 (see Figure 3B) for attaching the cap 40, which will be described later, to the boss 10 is screwed into the holes 11d. The number of holes 11d is not particularly limited.

[0039] The flange portion 12 is a portion that extends radially outward from the outer circumferential surface of the main body portion 11. The flange portion 12 is formed in an annular shape along the outer circumferential surface of the main body portion 11. The flange portion 12 is provided at a position shifted from the end face 11a of the main body portion 11 toward the end face 11c by the thickness of the rotor blade 20, which will be described later.

[0040] The flange portion 12 has, for example, six through holes 12a and two blind holes 12b. The through holes 12a are provided at equal intervals from each other in the circumferential direction. The blind holes 12b are provided at positions opposite each other in the radial direction.

[0041] The through-hole 12a is formed to penetrate the flange portion 12 in the thickness direction. A bolt B4 (see Figure 3B) for connecting the boss 10 and the rotor blade 20, which will be described later, is inserted through the through-hole 12a. The blind hole 12b is formed on the side of the flange portion 12 facing the end face 11a. A knock pin P (see Figure 3B) for positioning when connecting the boss 10 and the rotor blade 20, which will be described later, is inserted through the blind hole 12b.

[0042] Figure 5A is a cross-sectional view of the wear plate 14 along axis x2. Figure 5B is a plan view of the wear plate 14 as seen from the direction of arrow B in Figure 5A. The wear plate 14 is formed in a disc shape from a metal such as steel. The wear plate 14 is detachably attached to the end face 11a of the main body 11. The outer diameter of the wear plate 14 is the same as or approximately the same as the outer diameter of the main body 11 of the boss 10.

[0043] The wear plate 14 has, for example, six through holes 14a formed in the circumferential direction on its outer edge. The through holes 14a are formed as holes that penetrate in the thickness direction and are equally spaced from each other in the circumferential direction. A bolt B1 for attaching the wear plate 14 to the main body 11 of the boss 10 is inserted through each hole 14a.

[0044] The wear plate 14 has an insertion opening 15 formed concentrically with respect to the axis x2. When installed, the insertion opening 15 has a protruding portion 15a on the side opposite to the rotor blade 20. The protruding portion 15a is a part that extends from the inner circumferential surface of the insertion opening 15 toward the axis x2, and has an opening 15b in the center that is concentric with respect to the axis x2.

[0045] When the wear plate 14 is attached to the main body portion 11 of the boss 10, the wear plate 14 contacts the annular projection 13d of the main body portion 11 at its protruding portion 15a. The opening 15b, which has a smaller diameter than the inner diameter of the insertion opening 15, is tapered. In the attached state, the opening 15b is formed to decrease in diameter so as to approach the axis x2 from the drive unit 130 side towards the boss 10 side.

[0046] The outer diameter of the insertion opening 15 is set to be the same as or approximately the same as the outer diameter of the annular projection 13d of the main body 11. The dimensions of the insertion opening 15 along axis x2 are the same as or approximately the same as the dimensions of the annular projection 13d of the main body 11 along axis x2.

[0047] Figure 6A is a cross-sectional view of the rotor blade 20 along axis x2. Figure 6B is a plan view of the rotor blade 20 as seen from the direction of arrow B in Figure 6A. Figure 6C is a plan view of the rotor blade 20 as seen from the direction of arrow C in Figure 6A.

[0048] The rotor blade 20 is made of a metal such as steel. The rotor blade 20 has a mounting portion 21 and a vane portion 22. The rotor blade 20 is an annular portion of the rotor blade 20 that is detachably attached to the main body portion 11 of the boss 10 concentrically along the circumference of the main body portion 11 at the mounting portion 21. The rotor blade 20 has a hole portion 23 formed concentrically with respect to the axis x2. The mounting portion 21 is formed along the periphery of the hole portion 23.

[0049] The mounting portion 21 has six through holes 21a and two blind holes 21b. The through holes 21a are provided at equal intervals from each other in the circumferential direction. The blind holes 21b are provided at positions opposite each other in the radial direction.

[0050] The through hole 21a is formed to penetrate through the thickness direction. A bolt B3 for connecting to the boss 10 is inserted through the through hole 21a. The blind hole 21b is formed on the surface facing the flange portion 12 when the rotor blade 20 is connected to the boss 10. A knock pin P for positioning when connecting to the flange portion 12 of the boss 10 is inserted through the blind hole 21b.

[0051] When the pair of blind holes 21b of the rotor blade 20 are aligned with the pair of blind holes 12b of the boss 10, the through hole 21a of the rotor blade 20 and the through hole 12a of the boss 10 are aligned.

[0052] The vane portion 22 is the part that extends outward from the mounting portion 21. In this embodiment, three vane portions 22 are provided. The vane portions 22 are formed with their leading edges curved in an arc in the direction of rotation of the rotary drive shaft 133 (direction of arrow R). Each vane portion 22 is provided at equal intervals in the direction of rotation R.

[0053] The vane portion 22 has a reinforcing portion 24. The reinforcing portion 24 is formed, for example, by build-up welding, on the leading edge located forward in the rotational direction R of the rotor blade 20. The vane portion 22 is formed thicker at the reinforcing portion 24 than the rest of the vane portion 22. The reinforcing portion 24 extends along the leading edge of the vane portion 22 for a predetermined length.

[0054] Figure 7A is a perspective view of the bushing 30. Figure 7B is a plan view of the bushing 30 from direction B in Figure 7A. Figure 7C is a cross-sectional view of the bushing 30 along line CC in Figure 7B. The bushing 30 is a roughly frustoconical cylindrical member made of, for example, resin. In the installed state, the bushing 30 is housed in the main body 11 of the boss 10 and attached to the main body 11 by bolts B1.

[0055] The outer diameter of the bushing 30 changes along the axis x2 from one end to the other. Specifically, when the bushing 30 is housed in the boss 10, the outer diameter of the bushing 30 increases from the side of the protruding portion 13a toward the side opposite the protruding portion 13a.

[0056] The bushing 30 has a slit 31 and a through hole 32. The slit 31 extends along the axis x3 and extends radially to the through hole 32. The through hole 32 is formed concentrically with respect to the axis x2. When no radial load is applied to the bushing 30, the inner diameter of the through hole 32 is larger than the outer diameter of the rotary drive shaft 133. When the bushing 30 is housed in the boss 10 and a radial load is applied to the bushing 30, the inner diameter of the through hole 32 is the same as or approximately the same as the outer diameter of the rotary drive shaft 133.

[0057] The bushing 30 has, for example, 12 holes 33 formed in the circumferential direction. The holes 33 penetrate from one end face to the other end face. The holes 33 are formed at equal intervals from one another in the circumferential direction. When the holes 33 are aligned with the holes 13c on the boss 10 side, the bolt B1 is inserted through them and the tip of the bolt B1 is screwed into the holes 13c. The number of holes 33 is not particularly limited and can be set as appropriate to match the holes 13c of the boss 10.

[0058] Furthermore, the bushing 30 has, for example, six holes 34 formed in the circumferential direction. The holes 34 penetrate from one end face to the other end face. The holes 34 are formed at equal intervals from one another in the circumferential direction and are partially located between two holes 33. Pull bolts used to remove the bushing 30 from the boss 10 are inserted into the holes 34. The number of holes 34 is not particularly limited.

[0059] Figure 8A is a plan view of the cap 40 as seen from the outside. Figure 8B is a cross-sectional view along line BB in Figure 8A. The cap 40 is formed in a roughly triangular pyramidal shape from, for example, resin. The cap 40 is attached to the end face 11c of the boss 10 on the side opposite to the rotor blade 20.

[0060] The cap 40 is sloped so as to rise from the peripheral edge 41 toward the axis x2. For example, six holes 42 are formed in the peripheral edge 41 of the cap 40 in the circumferential direction. When the holes 42 are aligned with the holes 11d of the boss 10, a bolt B2 is inserted and the tip of the bolt B2 is screwed into the holes 11d. The number of holes 42 is not particularly limited and is set as appropriate to match the holes 11d of the boss 10.

[0061] <Repair method for disc-type rotors> Figure 9 is a flowchart showing the steps for repairing the disc-type rotor 1. The papermaking raw materials agitated by the disc-type rotor 1 may contain foreign matter such as plastic. Therefore, the vane portion 22 of the rotor blade 20, which is located forward in the rotation direction R, may wear down, especially the reinforcing portion 24.

[0062] The method for repairing the disc-type rotor 1 according to this embodiment includes a removal step S1 of removing the disc-type rotor 1 from the rotation drive shaft 133, a disassembly step S2 of disassembling the boss 10 and the rotor blade 20, and a repair step S3 of repairing the vane portion 22 of the rotor blade 20, characterized in that in the repair step S3, the rotor blade 20 is attached to a jig having the same outer shape as the main body portion 11 of the boss 10 at the mounting portion 21 and the vane portion 22 is repaired. The method for repairing the disc-type rotor 1 will be described in detail below.

[0063] To repair the reinforcement section 24, the disc-type rotor 1 is removed from the rotating drive shaft 133 (removal process S1). First, the cap 40 is removed from the boss 10, and then the bushing 30 is pulled out from the boss 10. This allows the rotating drive shaft 133 and the disc-type rotor 1 to be separated from each other.

[0064] Next, the boss 10 and the rotor blade 20 are disassembled (disassembly step S2). After the rotor blade 20 is separated from the boss 10, the vane portion 22 of the rotor blade 20 is repaired (repair step S3).

[0065] When the disc-type rotor 1 is mounted on the rotating drive shaft 133, the boss 10 is formed so that its axis x2 coincides with the rotation axis x1 of the rotating drive shaft 133. In other words, the boss 10 rotates while being centered without any play when the rotating drive shaft 133 rotates. Therefore, it is extremely undesirable for the boss 10 to deform due to the heat generated during the repair of the disc-type rotor 1.

[0066] According to the disc-type rotor 1 of this embodiment, the boss 10 and the rotor blade 20 can be disassembled by removing the bolt B4 and the knock pin P, and the rotor blade 20 can be repaired while separated from the boss 10. As a result, even if build-up welding is performed on the leading edge of the vane portion 22, the heat from the welding will not act on the boss 10.

[0067] In the repair process, a jig (not shown) having a shape corresponding to the outer shape of the main body portion 11 of the boss 10 is attached to the mounting portion 21 of the rotor blade 20. The jig is an annular jig corresponding to the flange portion 12 of the boss 10, and for example, the boss 10 may be used as a common jig for repair.

[0068] The holes formed in the annular jig and the holes 23 in the mounting portion 21 are aligned, and for example, a bolt B4 is inserted through both holes. In this state, if the reinforcement portion 24 is repaired by build-up welding on the vane portion 22, the heat from the welding is transmitted through the vane portion 22 to the mounting portion 21. However, because the annular jig is attached to the parts of the rotor blade 20 that do not want to be deformed, especially the mounting portion 21, deformation due to heat can be suppressed to the greatest extent possible.

[0069] Furthermore, a gap is provided between the disc-type rotor 1 and the drive unit 130 to prevent interference with the rotation of the rotor blades 20. During agitation by the disc-type rotor 1, papermaking material may enter this gap and foreign matter may become trapped. If the disc-type rotor 1 continues to rotate with foreign matter trapped, the wear plate 14 of the boss 10 will wear down.

[0070] Therefore, depending on the condition of the wear plate 14, it may be necessary to replace the wear plate 14 (replacement step S4). Since the wear plate 14 is attached to the boss 10 via bolt B2, the wear plate 14 can be easily removed from the boss 10 by removing bolt B2. Note that the supplementary step S3 and the replacement step S4 after the disassembly step S2 may be performed in parallel, and the order is not particularly limited.

[0071] According to the disc-type rotor 1 of this embodiment, the boss 10 and the rotor blade 20 are constructed as separate components and are connected to each other in a detachable manner, so it is not necessary to repair the entire disc-type rotor 1. In other words, only the rotor blade 20 that requires repair can be repaired. As a result, the boss 10, which is desirable to avoid deformation due to repair or readjustment due to replacement for reasons such as adjustment of the axis when attached to the rotary drive shaft 133, is not affected by heat from welding work on the rotor blade 20, for example.

[0072] Furthermore, since a wear plate 14 is attached to the end face 11a of the boss 10 facing the drive unit 130, the end face 11a of the boss 10 will not wear down due to contact with foreign matter. Since the wear plate 14 is detachably attached to the end face 11a of the boss 10, it is only necessary to replace the worn wear plate 14, rather than replacing the entire boss 10.

[0073] As described above, in the disc-type rotor 1, the only parts that need to be repaired or replaced are the rotor blades 20 and the wear plate 14, and the boss 10 can be reused repeatedly, thus reducing the cost and labor associated with repair and replacement.

[0074] Furthermore, compared to a disc-type rotor in which the boss 10 and rotor blade 20 are manufactured as a single unit, the boss 10 and rotor blade 20 are manufactured separately. As a result, the disc-type rotor 1 according to this embodiment is easier to manufacture than an integrated disc-type rotor, and manufacturing costs can be reduced, as well as the manufacturing period can be shortened.

[0075] <Other> Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and includes all aspects included in the concept and claims of the present invention. Furthermore, each component may be selectively combined as appropriate to achieve at least some of the above-described problems and effects. Also, for example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be appropriately changed depending on the specific use of the present invention. In addition, in the above embodiments, "repair" was performed by build-up welding on the vane portion 22, but it may also be performed by replacing the rotor blade 20 with a new rotor blade 20. [Explanation of symbols]

[0076] 1...Disc-type rotor, 10...Boss, 11...Main body, 12...Flange, 14...Wear plate (plate), 20...Rotor blade, 21...Mounting part, 22...Vane part, 24...Reinforcement part, 100...Pulp dethrasher (processing machine), 133...Rotating drive shaft

Claims

1. A disc-type rotor for a processing machine that separates foreign matter from raw materials in papermaking raw materials, A boss is attached to the rotary drive shaft of the processing machine in a manner that prevents relative rotation and allows for detachment. A rotor blade that is detachably attached to the aforementioned boss, Equipped with, A disc-type rotor characterized in that, when attached to the processing machine, the boss has a removable annular plate on the surface facing the processing machine that is not covered by the rotor blade.

2. The boss has a cylindrical body portion that is mounted concentrically to the rotary drive shaft, The rotor blade has an annular mounting portion that is detachably attached to the main body concentrically along the circumference of the main body, and at least one vane portion that extends outward from the mounting portion. The disc-type rotor according to feature 1.

3. A processing machine for separating foreign matter from raw materials in papermaking raw materials, characterized by comprising a disc-type rotor as described in Claim 1 or 2.

4. A method for repairing a disc-type rotor according to claim 1 or 2, A removal step of removing the disc-type rotor from the rotating drive shaft, A disassembly step of separating the boss and the rotor blade, A repair process for repairing the rotor blade, A replacement step of replacing an annular plate attached to the surface of the boss facing the processing machine, which is not covered by the rotor blade, with a new annular plate, including A method for repairing a disc-type rotor, characterized by the following:

5. The method for repairing a disc-type rotor according to claim 4, characterized in that, in the repair step, a predetermined jig is attached to an annular mounting portion that is mounted concentrically along the circumference of the boss of the rotor blade to repair the rotor blade.

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