Grinding type grain milling machine and maintenance method thereof

Abstract

To reduce weight of a grinding roll of a grinding type grain milling machine and to facilitate replacement work.SOLUTION: A grinding type grain milling machine has a rotating body having abrasive grains fixed to an outer peripheral surface thereof, and a driving portion for rotating the rotating body. The rotating body includes a pedestal, an abrasive grain sheet wound around an outer peripheral surface of the pedestal, and a fixing member fixing the abrasive grain sheet to the pedestal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a grinding-type grain polisher for polishing grains. [Background technology]

[0002] Grain polishers are mainly categorized into grinding-type and friction-type grain polishers. Of these, a known grinding-type grain polisher, as disclosed in Patent Documents 1 and 2, for example, is a vertical device in which polishing rolls are stacked vertically in multiple tiers, each tier having a disk-shaped grinding wheel made of emery (made by adding powdered clay and feldspar to carborundum, mixing it with a binder and water, molding it, drying it, and sintering it at a high temperature of about 1380 to 1440°C) on the periphery, and a porous cylinder (bran removal polishing cylinder) with holes for allowing the bran to pass through is placed outside the rolls. These vertical grinding grain polishers rotate polishing rolls arranged in multiple stages, and when grain is fed from above, the grain rotates and revolves in the space (polishing chamber) between the grinding wheels on the outer surface of the polishing rolls and the porous cylinder, and the surface is ground by the grinding wheels to remove the bran, and the polished grain is then discharged from the machine through the discharge outlet.

[0003] Furthermore, Patent Document 3 discloses a grinding type whitening roll in which a plurality of abrasive grain plates and holding plates are alternately fixed to the outer peripheral surface of a roll body that is arranged with its axial direction horizontal. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3266167 [Patent Document 2] Japanese Patent Application Publication No. 2018-8241 [Patent Document 3] Patent Publication No. 2021-159781 Summary of the Invention [Problem to be solved by the invention]

[0005] The grinding wheels used in the polishing rolls of the grinding-type vertical grain polishers described in Patent Documents 1 and 2 are manufactured by a baking method, and their surfaces wear down as grains are ground. Generally, after about six months of operation, the polishing rolls are removed and replaced with new ones. The removed polishing rolls are regenerated by sharpening the abrasive grain surfaces of the grinding wheels on the periphery. Each of the polishing rolls, stacked approximately seven layers high, is designed to weigh a minimum (e.g., 25 kilograms or less). However, due to their heavy weight, replacement is not easy. Furthermore, because the wear levels of the grinding wheels on polishing rolls stacked approximately seven layers high are not uniform, only the worn ones need to be replaced sequentially. This increases the frequency of replacement, requiring the grain polisher to be stopped each time. This reduces production efficiency.

[0006] SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to facilitate the replacement of the grindstones of a grinding type whitening roll. [Means for solving the problem]

[0007] To achieve the above object, the grinding-type grain polisher of the present invention includes a rotor having abrasive grains fixed to its outer periphery and a drive unit for rotating the rotor. The rotor includes a base, an abrasive grain sheet wound around the outer periphery of the base, and a fixing member for fixing the abrasive grain sheet to the base.

[0008] The abrasive sheet may include, for example, a base sheet and a metal film provided on the upper surface of the base sheet. The abrasive grains are dispersed in the metal film, with some of the abrasive grains embedded in the metal film and the remaining portions protruding from the surface of the metal film.

[0009] The metal film may be, for example, a plated film.

[0010] The abrasive grain sheet may be, for example, strip-shaped, and in this case, recesses into which the strip-shaped abrasive grain sheet is inserted are provided along the circumferential direction at both ends of the base in the rotation axis direction.

[0011] The recessed portion can be provided, for example, so that the depth direction is parallel to the rotation axis of the base.

[0012] The fixing member is attached, for example, to at least one location in the circumferential direction of the outer peripheral surface of the base, and the abrasive sheet is fixed to the base by being sandwiched between the outer peripheral surface of the base and the fixing member.

[0013] The present invention also provides a maintenance method for a grinding-type grain polisher, which includes the steps of removing the abrasive grain sheet from the base by removing the fixing member from the base without removing the base from the grinding-type grain polisher, and wrapping a new abrasive grain sheet around the base and then fixing the fixing member to the base, thereby sandwiching and fixing the new abrasive grain sheet between the fixing member and the outer peripheral surface of the base. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a grinding-type grain polishing machine in which the grinding stones of the grinding-type polishing rolls can be easily replaced. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a vertical cross-sectional view of a grinding-type grain polisher according to a first embodiment of the present invention. [Figure 2] 1 is a horizontal cross-sectional view of a grinding-type grain polisher according to a first embodiment of the present invention. [Figure 3] 1(a) and 1(b) are a perspective view and a cross-sectional view taken along line AA of a grinding roll according to a first embodiment. [Figure 4] 1(a) to 1(c) are perspective views of a base of a grinding roll of a first embodiment, a BB cross-sectional view and a CC cross-sectional view, and FIG. 1(d) is a perspective view of a fixing member. [Figure 5] FIG. 1(a) is a plan view of an abrasive grain sheet of a first embodiment, (b) is a perspective view showing the shape of the abrasive grain sheet wound around a base, and (c) is a DD cross-sectional view of the abrasive grain sheet. [Figure 6]10(a) and 10(b) are perspective views of a divided abrasive grain sheet according to a modified example of the first embodiment. [Figure 7] FIG. 10(a) is a perspective view of a grinding roll of a second embodiment, and FIG. 10(b) is a perspective view of a base. [Figure 8] FIG. 10(a) is a perspective view of a grinding roll according to a modified example of the second embodiment, and FIG. 10(b) is a perspective view of a base. [Figure 9] FIG. 10 is a perspective view of a grinding roll according to a third embodiment. [Figure 10] FIG. 11 is a perspective view of a grinding roll according to a first modified example of the third embodiment. [Figure 11] 10(a) is a plan view of an abrasive grain sheet of a grinding roll according to a second modified example of the third embodiment, and FIG. 10(b) is a perspective view of the abrasive grain sheet wound around a base. [Figure 12] FIG. 11 is a perspective view of a grinding roll according to a second modified example of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0017] First Embodiment A grinding-type grain polisher 1 of the first embodiment will be described with reference to Figures 1 to 6. Figure 1 is a cross-sectional view of the grain polisher 1 taken along the vertical direction, and Figure 2 is a cross-sectional view taken along the horizontal direction.

[0018] As shown in FIG. 1, the grinding-type grain polisher 1 of this embodiment is a vertical grinding-type grain polisher in which multiple tiers (seven tiers in FIG. 1) of rotors 100, each with abrasive grains fixed to its outer periphery, are stacked vertically within a cylindrical housing 33 and rotatably supported by a rotary shaft 5. The rotors 100 have a cylindrical outer periphery, and will be referred to as grinding rolls 100 hereinafter. Note that, although an example of a grinding roll 100 with a cylindrical outer periphery is described here, the outer periphery of the grinding roll 100 is not limited to being cylindrical. The outer periphery of the grinding roll 100 may have steps or inclined surfaces in the axial direction, and may also be designed to have a shape that is not a perfect cylinder, such as one that is partially flat in the circumferential direction.

[0019] <Structure of the grinding roll 100> Next, we will explain the structure of the grinding roll 100. Figures 3(a) and (b) are a perspective view and an AA cross-sectional view of the grinding roll 100, Figures 4(a) to (c) are a perspective view, a BB cross-sectional view and a CC cross-sectional view of the base 101 of the grinding roll 100, and Figure 4(d) is a perspective view of the fixing member.

[0020] The grinding roll 100 is composed of a base 101 whose outer surface is shaped like a rotating body (here, a cylinder), an abrasive grain sheet 120 wrapped around the outer surface of the base, and a fixing member 130 that fixes the abrasive grain sheet 120 to the base.

[0021] As shown in Figures 5(a) to (c), the abrasive grain sheet 120 is a strip-shaped member with abrasive grains fixed to its surface. Specifically, as shown in Figure 5(c), the abrasive grain sheet 120 has a metal film 122 mounted on the upper surface of a base sheet 121. The metal film 122 is a plated film, and abrasive grains 123 are dispersed in the metal film 122. A portion (lower portion) of the abrasive grains 123 is embedded in the metal film 122 and thereby fixed to the metal film 122, while the remaining portion (upper portion) protrudes from the surface of the metal film 122. An abrasive grain sheet 120 with such a structure can be manufactured by electrodepositing or welding the abrasive grains 123 to the base sheet 121.

[0022] For example, black silicon carbide (C), green silicon carbide (GC), alumina (WA), diamond (C), boron nitride (cBN), etc. can be used as the abrasive grains 123, and particularly, superabrasive grains such as diamond and boron nitride are suitable. The particle size of the abrasive grains 123 varies depending on the grain to be polished, but is, for example, about 125 μm to 1200 μm.

[0023] A resin printed circuit board having a thickness of about 0.5 mm to 3 mm can be used for base sheet 121. A metal having a thickness of about 100 μm to 500 μm can be used for metal film 122, with nickel being particularly suitable.

[0024] 4(a) to 4(c), the base 101 is configured to include a cylindrical base metal body 102, a fixing cylinder 104 disposed at the center of the base metal body 102, a reinforcing beam 105 connecting the base metal body 102 and the fixing cylinder 104, and a pair of annular plates 103 attached to the upper and lower surfaces of the base metal body. The fixing cylinder 104 is journaled on the rotation shaft 5.

[0025] The diameter of the pair of annular plates 103 is larger than the outer diameter of the base metal body 102, and edge members 103a of a predetermined height are fixed to the periphery of the annular plates 103. As a result, recesses 106 into which the upper and lower ends of the strip-shaped abrasive grain sheets 120 can be inserted are formed between the edge members 103a and the outer peripheral surface of the base metal body 102. The depth direction of the recesses is parallel to the rotation axis of the base 101.

[0026] In addition, the edge member 103a is provided with a notch 107 as a blade insertion port for inserting the abrasive grain sheet 120 into the recess 106. As a result, by inserting the upper and lower ends of the abrasive grain sheet 120 into the recess 106 through the notch 107 of the edge member 103a and wrapping the abrasive grain sheet 120 along the outer circumferential surface of the base metal body 102, the abrasive grain sheet 120 can be attached in a curved shape that follows the outer circumferential surface of the base metal body 102, as shown in FIG.

[0027] A pair of screw holes 108 with internal threads formed on the inner walls are provided in the vertical direction at positions on the base metal body 102 corresponding to the notches 107 of the edge member 103a. The fixing member 130 that clamps and holds the abrasive grain sheet 120 is a plate-shaped member with protrusions 131 that fit into the notches 107, as shown in Figure 4(d). The fixing member 130 is provided with through holes 132 for inserting screws at positions corresponding to the screw holes 108 of the base metal body 102.

[0028] The longitudinal length of the strip-shaped abrasive grain sheet 120 is designed to be a length that does not cover the screw holes 108 and is sandwiched between the fixing member 130 and the outer peripheral surface of the base metal body 102. As a result, the abrasive grain sheet 120 is fixed to the base 101 by being sandwiched between the outer peripheral surface of the base metal body 102 of the base 101 and the fixing member 130.

[0029] With this structure, the abrasive grain sheet 120 can be removed from the base 101 without removing the base 101 from the rotating shaft 5, and a new abrasive grain sheet 120 can be attached to the base 101 and fixed by the fixing member 130.

[0030] The cylindrical base metal body 102 is made of, for example, a metal such as cast iron, iron, aluminum, etc., and has a thickness of 5 mm to 30 mm. The fixing cylinder 104, the reinforcing beam 105, and the annular plate 103 are also made of a metal such as cast iron, iron, aluminum, etc.

[0031] <Overall configuration of grinding type grain polisher> The overall configuration of the grinding-type grain polisher 1, excluding the grinding roll 100, will be described.

[0032] A porous cylinder 32 is disposed between the housing 33 and the outer circumferential surface of the multi-stage grinding rolls 100. The space between the porous cylinder 32 and the outer circumferential surface of the multi-stage grinding rolls 100 forms a grain polishing chamber 35. Grain is supplied to the grain polishing chamber 35, where it is ground and polished by the abrasive grains on the outer circumferential surface of the grinding rolls 100. The ground bran passes through the holes in the porous cylinder 32 and is released into a bran removal chamber 34 between the porous cylinder 32 and the housing 33.

[0033] The porous cylinder 32 has openings at several locations (four locations in Figure 2) around its circumference, and resistance claws 37 that narrow the space in the grain polishing chamber 35 protrude toward the outer circumferential surface of the grinding roll 100. The resistance claws 37 are held to the housing 33 and the porous cylinder 32 by holders 15 and 16. The amount by which the resistance claws 37 protrude into the grain polishing chamber 35 can be adjusted by turning the handle 66. By protruding the resistance claws 37 into the grain polishing chamber 35, the amount of grinding of the grains in the grain polishing chamber 35 can be adjusted.

[0034] Each of the multiple stages of grinding rolls 100 is arranged with its axial direction facing vertically, and is rotatably supported by a rotating shaft 5. An impeller-shaped spacer 42 is sandwiched between the multiple rotating bodies 100.

[0035] A hopper 49 and a lid 8 are provided at the top of the housing 33. An exhaust fan 43 that exhausts air from inside the housing 33 is provided at the bottom of the housing 33. Above the uppermost grinding roll 100, a feed roll 52 is rotatably supported by a rotary shaft 5. The feed roll 52 feeds grain fed from the hopper 49 into the grain polishing chamber 35 around the grinding roll 100.

[0036] The rotating shaft 5 may be hollow, and the outer circumferential surface may have a plurality of through-holes penetrating from the internal space of the rotating shaft 5 to the outside. The lower end 5a of the rotating shaft 5 has an opening connected to the internal space and protrudes from the bottom surface of the housing 33 to the external space. The through-holes on the outer circumferential surface of the rotating shaft 5 are located at least in the gap between the grinding rolls 100. As a result, when the exhaust fan 43 exhausts air from the housing 33, air is blown from the internal space of the rotating shaft 5 through the through-holes into the gap between the grinding rolls 100. The blown air flows from the rotating shaft 5 toward the outer periphery of the grinding roll 100, following the shape of the blades of the spacer 42. This prevents grains and bran from getting between the grinding rolls 100.

[0037] The lower end 5a of the rotating shaft 5 is supported by a support 28 via a bearing 27. A pulley 46 is fixed to the lower end 5a of the rotating shaft 5, and is connected to a pulley 45 attached to the rotating shaft of a motor (drive unit) 44 by a rotary belt 47. In this way, the rotating shaft 5 is driven to rotate by the motor 44.

[0038] The lower part of the housing 33 is provided with a discharge port through which polished grains are discharged into a chute 94. A resistance plate 95 receiving the force of a weight 99 is disposed at the discharge port, and a predetermined outlet pressure is applied to the grain polishing chamber 35. Therefore, the grains in the grain polishing chamber 35 are ground and polished while being packed at an appropriate packing density.

[0039] <Operation of each part during grain milling> The operation of each part during grain milling will be explained. When the motor 44 is started, the grinding roll 100 and the feed roll 52 are rotated by the rotary shaft 5. When the exhaust fan 43 is started, air is blown to remove the bran. In this state, the grain to be milled is fed into the hopper 49.

[0040] Next, the feed rate adjusting gate 88 is opened using the handle 89 provided on the hopper 49, and the grains are introduced into the feed roll 52. This causes the grains to be continuously fed from the feed roll 52 to the upper end of the grain polishing chamber 35.

[0041] During the steady state of grain polishing operation of the grinding-type grain polisher 1, grains fed into the grain polishing chamber 35 gradually flow downward while intermittently repeating rotation and revolution (circular motion around the rotation axis 5) between the porous cylinder 32 and the grinding roll 100 under a relatively low pressing force. As the grains move, their surfaces come into contact with the abrasive grains on the outer periphery of the grinding roll 100 and are scraped off. In particular, where the resistance claws 37 protrude into the inside of the grain polishing chamber 35, the grains are subjected to a braking effect due to the narrow gap between the resistance claws 37 and the grinding roll 100, and their surfaces are strongly rubbed by the abrasive grains of the grinding roll 100 and scraped off. Furthermore, the presence of the resistance claws 37 acts as an intermittent brake on the overall flow of grains within the grain polishing chamber 40, so that polishing progresses gradually within the grain polishing chamber 40. The shape of the grains can be changed by adjusting the extent to which the resistance claws 37 protrude. The bran removed from the grains by the grinding action passes through the holes in the porous cylinder 32 and is released into the bran removal chamber 34, where it accumulates.

[0042] When the grains reach the lower end of the grain polishing chamber 35, the resistance plate 95 opens against the pressing force of the weight 99, and the grains are discharged and sent to the next process via the chute 94.

[0043] <Replacing the abrasive sheet 120> When grains are polished, the abrasive grains 123 of the abrasive grain sheet 120 gradually wear away. In the grinding-type grain polisher 1 of this embodiment, it is possible to easily replace only the abrasive grain sheet 120 of the worn grinding roll 100 among the seven stages of grinding rolls 100. Specifically, the abrasive grain sheet 120 can be removed from the base 101 by removing the fixing member 130 from the base 101 and pulling out the butted ends of the abrasive grain sheet 120 from the position of the cutout 107.

[0044] Next, the end of a new abrasive grain sheet 120 is inserted into the recess 106 from the position of the notch 107 and wrapped around the base metal body 102 of the base 101. The fixing member 130 is attached to the screw hole 108 of the base metal body 102 with a screw 133. As a result, the abrasive grain sheet 120 is sandwiched and fixed between the outer peripheral surface of the base metal body 102 of the base 101 and the fixing member 130.

[0045] In this way, in the grinding-type grain polisher 1 of the first embodiment, when the abrasive grains 123 of the abrasive grain sheet 120 become worn, the abrasive grain sheet 120 alone can be detached and replaced with a new one while the base 101 of the grinding roll 100 remains attached to the rotary shaft 5. This makes the replacement work easier and also improves productivity by reducing the downtime of the production line.

[0046] Furthermore, unlike roll-shaped grindstones, the abrasive grain sheets 120 can be stacked flat as shown in FIG. 5(a), which requires less inventory space and reduces transportation and logistics costs.

[0047] Furthermore, the vertical grinding-type grain polisher 1 is configured with multiple grinding rolls 100 stacked one above the other, and it is easy to use abrasive grain sheets 120 with abrasive grains 123 of different coarseness for each grinding roll 100. Therefore, the amount of bran removed by grinding can be set for each type of grain to be polished or for each process. In other words, it is possible to increase the variety of polishing depending on the quality of the polishing, etc., and the degree of freedom in polishing is improved.

[0048] <Modification of the first embodiment> The abrasive grain sheet 120 covering the base 101 may be configured to cover the entire outer peripheral surface with a single sheet, or may be configured as two or three divided abrasive grain sheets 120 attached to the base 101, as shown in Figures 6(a) and 6(b). In this case, it is desirable to attach fixing members 130 to the divided positions of the abrasive grain sheet 120, respectively.

[0049] The cylindrical base metal body 102 can also be made of a lightweight material, such as titanium, aluminum, or resin, to reduce the weight.

[0050] Second Embodiment The grinding-type grain polisher of the second embodiment will be described with reference to FIGS. 7(a) and 7(b).

[0051] The grinding-type grain polisher of the second embodiment differs from the grinding-type grain polisher of the first embodiment in that the fixing member 130 and the base 101 are further provided with one or more through holes 140, 141 that penetrate from the outer circumferential surface of the fixing member 130 to the internal space of the base 101. The other configurations are the same as those of the grinding-type grain polisher of the first embodiment.

[0052] Furthermore, a through-hole penetrating from the internal space of the rotating shaft 5 to the outside is also provided on the outer peripheral surface of the rotating shaft 5 at a position inside the base 101. A through-hole is provided in the fixing cylinder 104 of the base 101 at the position of the through-hole provided in the rotating shaft 5.

[0053] This allows a flow of air to be generated that passes from inside the rotary shaft 5 through the inside of the base 101, passes through the through-holes 140 and 141 of the base 101 and the fixing member, and is ejected into the grain polishing chamber 35.

[0054] By blowing air from the grinding rolls 100 in this way, it is possible to prevent the grain temperature in the polishing chamber from rising, improving the quality of polished grains, and by actively discharging the bran, it is possible to improve polishing efficiency. Furthermore, by blowing air from the grinding rolls 100, it is possible to arrange the upper and lower grinding rolls 100 in contact with each other without placing a spacer 42 between them. Therefore, the height of the grinding rolls 100 can be increased by the height of the spacer 42, and the grinding area can be increased. This improves polishing efficiency.

[0055] <Modification of the second embodiment> A modification of the second embodiment will be described with reference to FIGS. 8(a) and 8(b).

[0056] In the second embodiment, the through holes 140, 141 for blowing air from the inside of the base 101 to the polishing chamber 35 on the outside were configured to be provided only on the fixed member 130, but as shown in Figures 8(a) and (b), it is also possible to provide one or more through holes 144 penetrating from the internal space to the outside on the entire outer circumferential surface of the base metal body 102 of the base 101. In this case, one or more through holes 143 penetrating in the thickness direction are also provided in the abrasive grain sheet 120 at positions corresponding to the through holes 144.

[0057] This allows air to be ejected from the outer peripheral surface of the grinding roll 100, and in addition to the effects of the second embodiment, it is possible to prevent the abrasive grain sheet 120 from overheating and protect the abrasive grain sheet 120. In addition, it is possible to further suppress the rise in grain temperature inside the grain polishing chamber 35 than in the second embodiment, which has the effect of improving the quality of polished grain.

[0058] <Third embodiment> The grinding-type grain polisher of the third embodiment will be described with reference to FIG.

[0059] In the grinding-type grain polisher of the third embodiment, a protrusion 150 is provided on the outer peripheral surface of the fixing member 130. In the example of FIG.

[0060] By arranging the protrusions 150 in this manner, the grain in the grain polishing chamber 35 can be actively moved, just like the resistance claws 37, thereby stirring the grain in the grain polishing chamber 35 and breaking the bran, thereby improving the quality of the polished grain and the efficiency of grinding.

[0061] <Modification 1 of the Third Embodiment> A first modification of the third embodiment will be described with reference to FIG.

[0062] 10, the protrusion 150 of the third embodiment may be configured to be able to be fixed at an angle relative to the axial direction of the rotation shaft 5. For example, by configuring the protrusion 150 to be fastened with a screw 151 at one point in the center thereof, the protrusion 150 can be fixed at an angle desired by the user.

[0063] By tilting the protrusion 150 in this manner, the rotation of the grinding roll 100 can be made to move the grain in the grain polishing chamber 35 in an up and down direction, such as by lifting the grain upward. This makes it possible to adjust the degree of polishing as appropriate depending on the raw material conditions and process conditions, thereby increasing the flexibility of grain polishing operations.

[0064] <Modification 2 of the Third Embodiment> A second modification of the third embodiment will be described with reference to FIGS. 11(a), 11(b) and 12. FIG.

[0065] 11(a) and 11(b), in Modification 2, the abrasive grain sheet 120 has a main plane that is a parallelogram when not wrapped around the base 101, and the sides that face each other when wrapped around the base 101 are inclined with respect to the rotation axis 5 of the base 101. Therefore, the circumferential width of the fixing member 130 is larger than in Embodiment 1, and the screws 133 are arranged at an incline to correspond to the inclined sides of the abrasive grain sheet 120.

[0066] In this configuration as well, the protrusion 150 can be arranged so that its orientation can be tilted to a desired tilt angle.

[0067] The configuration of the present modified example 2 has the advantage that the parallelogram-shaped abrasive grain sheet can be easily attached to the base 101, facilitating replacement.

[0068] In the above-described embodiment, a vertical grinding-type grain polisher 1 has been described, but it is of course possible to use the grinding roll 100 in a grain polisher in which the rotation axis is arranged horizontally. [Explanation of symbols]

[0069] 1. Grinding type grain polisher 5 Rotation Axis 5a Bottom end 8 Lid 15 Holder 16 Holder 27 Bearings 28 Supports 32 Porous cylinder 33 Case 34 Rice bran removal room 35 Grain mill 37 Resistance Claw 42 spacer 43 Exhaust fan 44 Motor 45 Pulley 46 Pulley 47 Rotating Belt 49 Hopper 52 Feeding roll 66 Handle 88 Supply volume adjustment gate 89 Handle 94 shots 95 Resistance plate 99 weights 100 Rotating body (grinding roll) 101 Pedestal 102 Base metal body 103 Annular Plate 103a Edge member 104 Fixing cylinder 105 Reinforced beam 106 Recess 108 screw holes 120 abrasive sheet 121 Basic Sheet 122 Metal Film 123 Abrasive grain 130 Fixing member 131 Protrusion 132 Through hole 140 through hole 141 Through hole 143 Through Hole 144 Through Hole 150 protrusions

Claims

1. a rotating body having abrasive grains fixed to an outer peripheral surface thereof, and a driving unit for rotating the rotating body; A grinding-type grain polisher, characterized in that the rotating body includes a base, an abrasive grain sheet wrapped around the outer peripheral surface of the base, and a fixing member that fixes the abrasive grain sheet to the base.

2. 2. A grinding-type grain polisher as described in claim 1, characterized in that the abrasive grain sheet includes a base sheet and a metal film provided on the upper surface of the base sheet, the abrasive grains are dispersed and arranged in the metal film, and a portion of the abrasive grains is embedded in the metal film and the remaining portion protrudes from the surface of the metal film.

3. 3. The grinding-type grain polisher according to claim 2, wherein the metal film is a plated film.

4. 2. A grinding-type grain polisher as described in claim 1, characterized in that the abrasive grain sheet is strip-shaped, and recesses into which both ends of the strip-shaped abrasive grain sheet are inserted are provided along the circumferential direction at both ends of the base in the rotational axis direction.

5. 5. The grinding-type grain polisher according to claim 4, wherein the depth direction of the recess is parallel to the rotation axis of the base.

6. 2. A grinding-type grain polisher as described in claim 1, characterized in that the fixing member is attached to at least one point in the circumferential direction of the outer peripheral surface of the base, and the abrasive grain sheet is fixed to the base by being sandwiched between the outer peripheral surface of the base and the fixing member.

7. A maintenance method for the grinding-type grain polisher according to claim 1, removing the fixing member from the base, thereby removing the abrasive grain sheet from the base without removing the base from the abrasive-type grain polisher; a step of wrapping a new abrasive grain sheet around the base, and then fixing the fixing member to the base, thereby sandwiching and fixing the new abrasive grain sheet between the fixing member and the outer peripheral surface of the base; A maintenance method for a grinding-type grain polisher, comprising:

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