A grinding stone and a grinding device equipped with this grinding stone

Abstract

To provide a less expensive grindstone for grinding that hardly causes clogging and yet has an excellent processing ability.SOLUTION: Abrasive grain fixing regions 51 in which many abrasive grains 42 arranged in a group are formed on grinding surfaces 44 of a grindstone 17 for grinding. The abrasive grain fixing regions 51 are constituted of first regions 52 in a ring shape along outer peripheral edges of the grinding surfaces 44 and second regions 54 partially arranged in inner regions 53 surrounded by the first regions 52. Non-fixing regions 56 in which the abrasive grain 42 is not arranged are formed in places other than the second regions 54 of the inner regions 53. The second regions 54 are constituted of a plurality of unit fixing parts 55 arranged dispersively in the inner regions 53. Virtual straight lines L extending in a radial direction through centers of the grinding surfaces 44 and rotation trajectories T of the unit fixing parts 55 when rotating bases 43 are defined. Blank regions where the rotation trajectories T are not projected are not formed on the virtual straight lines L in the inner regions 53, when the rotation trajectories T of all of the unit fixing parts 55 are projected on the virtual straight lines L.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a grinding stone used for grinding grains such as soybeans and sesame seeds, and a grinding device including the grinding stone.

Background Art

[0002] Some of these grinding stones are produced by mixing abrasive grains and a binder and sintering them. Since the grinding stone produced by such sintering is a porous body with many pores, it is inevitable that water accumulates in the pores or the raw material ground by the grinding stone penetrates. For this reason, there are difficulties in that a great deal of labor is required for cleaning, and the grains that have entered the pores are likely to rot.

[0003] As a solution to the above problems, a grinding stone in which abrasive grains are fixed to a metal disk is known. For example, Patent Document 1 discloses a grinding stone (cermet grinding stone) in which abrasive grains made of tungsten carbide are fixed to the entire surface of a metal disk such as iron. The surface of the metal disk has a flat surface at the outer peripheral portion and a concave surface in the shape of a frustum of a cone inside the outer peripheral portion. Relatively fine abrasive grains are electrodeposited on the entire flat surface, and relatively coarse abrasive grains are electrodeposited on the entire concave surface. In the grinding device, the above pair of grinding stones are set in a state where the surfaces to which the abrasive grains are fixed face each other, one grinding stone is fixed, and the other grinding stone is rotated at a high speed, so that grinding processing is performed on the raw material introduced between these grinding stones. In such grinding processing, the raw material is moved outward between these grinding stones, and the raw material ground from the outer peripheral edge portions of both grinding stones is discharged. In the grinding stone in which abrasive grains are fixed to the surface of the metal disk as described above, there are no pores like the grinding stone produced by sintering, so cleaning can be performed more easily. Water does not accumulate in the pores, and the grains that have entered the pores do not rot, which is hygienic.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the grinding stone of Patent Document 1, since abrasive grains are fixed to the entire surface of the metal disk, "jamming" occurs easily where the ground raw material gets caught on the abrasive grains. That is, there is a risk that the ground raw material may not be properly discharged from between the outer peripheral edges of the two grinding stones. In addition, in the grinding stone of Patent Document 1, since abrasive grains are fixed to the entire surface of the metal disk, it is inevitable that the manufacturing cost of the grinding stone becomes extremely high. That is, since tungsten carbide, artificial diamond, cubic boron nitride, etc., which are the materials of the abrasive grains, are extremely expensive, it is inevitable that the manufacturing cost of the grinding stone increases significantly in proportion to the amount of abrasive grains used. These problems can be solved, for example, by reducing the density of the abrasive grains on the surface of the metal disk or by dispersing the abrasive grains, but in that case, there is a risk that the processing ability (grinding ability) of the grinding stone will be significantly reduced. Originally, in the grinding stone of Patent Document 1, since the abrasive grains are fixed by electrodeposition, it is impossible to apply electricity partially to the surface of the metal disk, and it is also impossible to fix the abrasive grains partially.

[0006] The present invention has been made for the purpose of solving the problems of the conventional grinding stone as described above, and aims to provide a grinding stone that is less likely to jam and has excellent processing ability at a lower cost. Another object of the present invention is to obtain a grinding device provided with the above-mentioned grinding stone.

Means for Solving the Problems

[0007] The present invention is in the processing chamber 1 of the grinding device to the grinding wheel put in, and performs the grinding process of the raw material put into the processing chamber 1 grinding targeting the grinding stone . Among themIt consists of a base 43 made of a metal disk body having a central opening 45 and a rubbing surface 44 on either the upper or lower surface excluding the central opening 45, and a large number of abrasive grains 42 fixed to the rubbing surface 44 of the base 43. An abrasive grain fixing region 51 is formed by arranging a large number of abrasive grains 42 in a group on the rubbing surface 44 A(51) is a ring-shaped first region 52 along the outer peripheral edge of the rubbing surface 44 A(52) and, the first region 52 A(52) is surrounded by an inner region 53 A(53) and a second region 54 partially arranged in it A(54) and is composed of. The inner region 53 A(53) excluding the second region 54 of A(54) forms a non-fixing region 56 without abrasive grains 42 A(56) and the second region 54 A(54) is composed of a plurality of unit fixing parts 55 dispersed in the inner region 53 A(53) A(55) The second region 54A (54) extends radially from the center side of the crushed surface 44A (44) and is formed radially by a plurality of strip-shaped unit fixing portions 55A (55) arranged at equal angular positions in the circumferential direction. A non-fixed region 56A (56) partitioned by adjacent unit fixing portions 55A (55) is formed in a fan shape that expands outward. Each unit fixing portion 55A (55) is formed with a blank portion 57A (57) without abrasive grains at a midway portion in the radial direction of the crushed surface 44A (44) or at the inner and outer ends in the radial direction. The distances from the center of the crushed surface 44A (44) to the blank portion 57A (57) in adjacent unit fixing portions 55A (55) are made different from each other. Then, a virtual straight line L running in the radial direction through the center of the rubbing surface 44 and the rotation locus T of the unit fixing part 55 when the base 43 is rotated are defined, and when the rotation locus T of all the unit fixing parts 55 is projected onto the virtual straight line L, it is configured so that no blank region where the rotation locus T is not projected is formed on the virtual straight line L in the inner region 53. This is the gist of the invention A(55) A(55) A(53)

[0008] The present invention is It is directed to a grinding wheel that is set inside the processing chamber 1 of a crushing device and performs crushing processing on the raw material input into the processing chamber 1. It consists of a base 43 made of a metal disk body having a central opening 45 and a crushing surface 44 on either the upper or lower surface excluding the central opening 45, and a large number of abrasive grains 42 fixed to the crushing surface 44 of the base 43. An abrasive grain fixing region 51B (51) formed by arranging a large number of abrasive grains 42 in a group shape on the crushing surface 44 includes a ring-shaped first region 52B (52) along the outer peripheral edge of the crushing surface 44 and a second region 54B (54) partially arranged in an inner region 53B (53) surrounded by the first region 52B (52). A non-fixing region 56B (56) without abrasive grains 42 is formed in the portion of the inner region 53B (53) excluding the second region 54B (54). The second region 54B (54) is composed of a plurality of unit fixing portions 55B (55) dispersed in the inner region 53B (53). The second region 54B (54) extends radially from the center side of the crushing surface 44B (44) and is formed radially by a plurality of strip-shaped unit fixing portions 55B (55) arranged at equal angular positions in the circumferential direction. The non-fixing region 56B (56) partitioned by adjacent unit fixing portions 55B (55) is formed in a fan shape with an outward expansion. The unit fixing portion 55B (55) is composed of a first unit fixing portion 66 having a blank portion 57B (57) without abrasive grains at a middle portion in the radial direction or at the inner and outer ends in the radial direction of the crushing surface 44B (44), and a second unit fixing portion 67 without the blank portion 57B (57). The first unit fixing portion 66 and the second unit fixing portion 67 are alternately arranged in the circumferential direction. Then, a virtual straight line L running radially through the center of the crushing surface 44 and the rotation locus T of the unit fixing portion 55B (55) when the base 43 is rotated are defined, and when the rotation locus T of all the unit fixing portions 55B (55) is projected onto the virtual straight line L, it is configured such that no blank region where the rotation locus T is not projected is formed on the virtual straight line L in the inner region 53B (53). .

[0009] The second region 54B (54) is formed between the first unit fixing portion 66 and the second unit fixing portion 67 and includes a third unit fixing portion 68 formed in a fan shape with an outward expansion that is in contact with the first region 52B (52).

[0010] The abrasive grain fixing region 51 is composed of a welded layer 58 formed by melting a metal piece made of a metal having a lower melting point than the metal constituting the base 43, which is formed on the surface of the crushed surface 44, and abrasive grains 42 held by the welded layer 58.

[0011] The rubbing device of the present invention is It includes a fixed grinding wheel 18 and a rotating grinding wheel 19 that are set facing each other in the processing chamber 1. The fixed grinding wheel 18 is constituted by the crushed grinding wheel 17 according to claim 1, and the rotating grinding wheel 19 is constituted by the crushed grinding wheel 17 according to claim 2.

Effect of the Invention

[0013] ​​​​​In the crushing grindstone 17 of the present invention, a grain fixing region 51 in which a large number of abrasive grains 42 are arranged in groups on the crushing surface 44 is composed of a ring-shaped first region 52 along the outer peripheral edge of the crushing surface 44 and a second region 54 partially arranged in an inner region 53 surrounded by the first region 52. A non-fixing region 56 without abrasive grains 42 is formed in a portion of the inner region 53 excluding the second region 54. According to the crushing grindstone 17 in which the non-fixing region 56 without abrasive grains 42 is formed on the crushing surface 44 in this way, compared with the conventional grindstone in which abrasive grains are fixed to the entire one surface of the metal disk, the total amount of abrasive grains 42 to be fixed can be reduced by the amount of the non-fixing region 56 provided.

[0014] For example, when a ring-shaped unit fixing portion 102 and a ring-shaped non-fixing region 103 are alternately formed in the inner direction and the outer direction in the inner region 101 as in the crushed grinding wheel 100 of the reference example in FIG. 13, when the rotation locus T of all the unit fixing portions 102 is projected onto the virtual straight line L, a blank region where the rotation locus T is not projected is formed on the virtual straight line L in the inner region 101. When the ring-shaped non-fixing region 103 is formed in this way and the blank region is formed, in the blank region, the raw material is not crushed, and it is inevitable that the processing ability of the crushed grinding wheel decreases. In addition, the raw material stays in the blank region and does not move smoothly outward, and in this respect too, it is inevitable that the processing ability decreases. On the other hand, as in the present invention, the second region 54 is composed of a plurality of unit fixing portions 55 arranged dispersedly in the inner region 53, and the virtual straight line L running radially through the center of the crushing surface 44 and the rotation locus T of the unit fixing portion 55 when the base 43 is rotated are defined. When the rotation locus T of all the unit fixing portions 55 is projected onto the virtual straight line L, if it is configured such that a blank region where the rotation locus T is not projected is not formed on the virtual straight line L in the inner region 53, the problem that the raw material is not crushed due to the blank region as described above does not occur, and the raw material existing in the inner region 53 can be surely brought into contact with the abrasive grains 42. Therefore, the processing ability of the crushed grinding wheel can be improved. In addition, if a non-fixing region 56 without abrasive grains 42 is formed on the crushing surface 44, the raw material can be smoothly moved outward through the non-fixing region 56. Therefore, it is possible to suppress the occurrence of "jamming" in which the crushed raw material gets caught on the abrasive grains 42, and in this respect too, the processing ability of the crushed grinding wheel can be improved. From the above, according to the present invention, since the raw material existing in the inner region 53 can be surely brought into contact with the abrasive grains 42 and smoothly moved outward, a crushed grinding wheel excellent in processing ability can be obtained.

[0015] When the abrasive grain fixing region 51 is composed of a welded layer 58 formed by melting a metal piece made of a metal having a melting point lower than that of the metal constituting the base 43, which is formed on the surface of the crushed surface 44, and abrasive grains 42 held by the welded layer 58, the metal piece and the abrasive grains 42 are placed on portions corresponding to the unit fixing portions 55 of the first region 52 and the second region 54 of the base 43, heated in a heating furnace to melt only the metal piece, and then cooled. Thus, the abrasive grains 42 can be held and fixed by the welded layer 58 made of the melted and solidified metal piece. Therefore, the abrasive grains 42 can be reliably fixed at desired sites on the crushed surface 44. Incidentally, in the form of fixing abrasive grains by electroplating, abrasive grains can only be formed on the entire surface of the crushed surface. However, according to the present invention, the abrasive grains 42 can be partially fixed at desired sites on the crushed surface 44.

[0016] The grinding stone 17 set in the processing chamber 1 is composed of a non-rotating fixed grinding stone 18 and a rotating grinding stone 19 that receives a driving force and rotates. The second region 54A of the fixed grinding stone 18 extends radially from the center side of the crushed surface 44A and is formed radially by a plurality of belt-shaped unit fixing portions 55A arranged at equal angular positions in the circumferential direction. A non-fixing region 56A partitioned by adjacent unit fixing portions 55A can be formed in a fan shape that expands outward. According to this, the unit fixing portions 55A and the non-fixing regions 56A are evenly distributed in the circumferential direction of the inner region 53A, and the raw material can be uniformly brought into contact with the abrasive grains 42 and crushed throughout the inner region 53A. Also, the raw material can be uniformly moved outward throughout the inner region 53A.

[0017] If a blank portion 57A without abrasive grains is formed in the intermediate portion in the radial direction or the inner and outer end portions in the radial direction of the crushed surface 44A in each unit fixing portion 55A, the raw material can move between adjacent non-fixing regions 56A·56A with the unit fixing portion 55A interposed therebetween through the blank portion 57A. As a result, since the raw material can be moved not only in the outward direction of the inner region 53A but also in the circumferential direction, the movement of the raw material between the two grindstones 18·19 can be complicated, and the contact opportunity between the raw material and the abrasive grains 42A can be increased. Further, if the distances from the center of the crushed surface 44A to the blank portion 57A in adjacent unit fixing portions 55A are different from each other, it is possible to prevent the raw material that has moved to the adjacent non-fixing region 56A through the blank portion 57A from continuously moving to the further adjacent non-fixing region 56A through the blank portion 57A. Therefore, it is possible to prevent the contact opportunity between the raw material and the abrasive grains 42A after moving through the blank portion 57A from being impaired, and the crushing process can be advanced more reliably.

[0018] The grindstone 17 set in the processing chamber 1 is composed of a fixed grindstone 18 that does not rotate and a rotating grindstone 19 that receives a driving force and rotates. The second region 54B of the rotating grindstone 19 extends radially from the center side of the crushed surface 44B and is formed radially by a plurality of belt-shaped unit fixing portions 55B arranged at equal angular positions in the circumferential direction. The non-fixing region 56B partitioned by the adjacent unit fixing portions 55 can be formed in a fan shape that expands outward. According to this, the unit fixing portion 55B and the non-fixing region 56B are evenly dispersed and arranged in the circumferential direction of the inner region 53B in the same manner as above, and the raw material and the abrasive grains 42B are brought into contact with each other uniformly throughout the inner region 53B for crushing, and the raw material can be uniformly moved outward throughout the inner region 53B. Further, by evenly dispersing the abrasive grains 42B in the circumferential direction of the crushed surface 44B, the center of gravity of the rotating grindstone 19 can be aligned with the central axis of the metal disk body forming the base 43B, and the weight balance in the circumferential direction of the rotating grindstone 19 can be made uniform. Therefore, it is possible to prevent the crushing device from vibrating due to the deviation of the center of gravity and balance of the rotating grindstone 19.

[0019] If the unit fixing part 55B is composed of a first unit fixing part 66 having a blank part 57B without abrasive grains at a middle part in the radial direction of the crushed surface 44B or at inner and outer end parts in the radial direction, and a second unit fixing part 67 not having the blank part 57B, the raw material can be moved between adjacent non-fixing regions 56B·56B with the first unit fixing part 66 interposed therebetween via the blank part 57B. Thereby, since the raw material can be moved not only in the outer direction of the inner region 53B but also in the circumferential direction, the movement of the raw material between the two grindstones 18·19 can be complicated, and the contact opportunity between the raw material and the abrasive grains 42B can be increased. Further, if the first unit fixing part 66 and the second unit fixing part 67 are alternately arranged in the circumferential direction, it is possible to prevent the raw material that has moved to the adjacent non-fixing region 56B via the blank part 57B from continuously moving to the further adjacent non-fixing region 56B via the blank part 57B. Therefore, it is possible to prevent the contact opportunity between the raw material and the abrasive grains 42B after the raw material has moved through the blank part 57B from being impaired, and the crushing process can be advanced more reliably.

[0020] If the second region 54B is formed between the first unit fixing part 66 and the second unit fixing part 67 and includes a third unit fixing part 68 formed in a fan shape with an outward expansion that contacts the first region 52B, the abrasive grains 42B fixed to the third unit fixing part 68 can be brought into contact with the raw material immediately before reaching the first region 52B. Thereby, the contact opportunity between the raw material and the abrasive grains 42B can be increased, and the raw material can be crushed more accurately.

[0021] According to a crushing device including a fixed grindstone 18 and a rotating grindstone 19 arranged facing each other in the processing chamber 1, and the fixed grindstone 18 and the rotating grindstone 19 being constituted by the above-mentioned crushed grindstone 17, it is possible to obtain a crushing device in which clogging of the grindstones 18·19 hardly occurs and which has excellent processing ability. Further, since the manufacturing cost of the fixed grindstone 18 and the rotating grindstone 19 can be suppressed, the overall cost of the crushing device can be suppressed.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0023] (Embodiment) Figures 1 to 11 show an embodiment in which the grinding stone according to the present invention is applied to a grinding device used for grinding grains (raw materials) such as soybeans and sesame seeds. In this embodiment, the front-back, left-right, and up-down directions follow the cross arrows shown in Figure 2 and the front-back, left-right, and up-down indications marked in the vicinity of each arrow. In Figure 2, the grinding device has a hollow housing 2 as a base that defines a processing chamber 1 for grinding the raw material. A machine room 3 where a control device and a drive device are installed is provided below the housing 2, and a funnel-shaped hopper 4 for supplying the raw material to the processing chamber 1 is provided above the housing 2.

[0024] The housing 2 includes a bottomed cylindrical housing body 7, a disk-shaped housing lid 8 that opens and closes the upper opening of the housing body 7, a hinge body 9 that rotatably supports the housing lid 8 with respect to the housing body 7, and the like. The housing body 7 includes a cylindrical peripheral wall 10 and a bottom wall 11 provided at the lower opening portion of the peripheral wall 10. The hinge body 9 is connected to the right side surface of the peripheral wall 10 and the upper surface of the housing lid 8. The housing lid 8 can rotate between a closed position (see Figure 2) that closes the upper opening of the housing body 7 and an open position (see Figure 9) that opens the upper opening of the housing body 7 around the hinge axis of the hinge body 9. A lock structure 12 composed of a herringbone joint formed of a pair of herringbones and a clamp band is provided between the housing body 7 and the housing lid 8. The housing lid 8 in the closed position is fixed to the housing body 7 by constructing the herringbone joint of the lock structure 12, and the housing lid 8 can rotate with respect to the housing body 7 by releasing the herringbone joint of the lock structure 12.

[0025] The housing body 7 is provided with a discharge pipe 15 composed of an L-shaped pipe for discharging the raw material crushed at the lower left part of the peripheral wall 10. Inside the housing body 7, a partition wall 16 inclined downward toward the discharge pipe 15 is provided. The housing 2 is partitioned vertically by this partition wall 16, and the area above the partition wall 16 is partitioned as the processing chamber 1. This partition wall 16 also serves as a guide plate for guiding the crushed raw material to flow down toward the discharge pipe 15. In the processing chamber 1, a pair of crushing grindstones 17·17 are arranged facing each other vertically. Specifically, the crushing grindstone 17 constituting the fixed grindstone 18 is fixed to the lower surface of the housing lid 8, and the crushing grindstone 17 constituting the rotating grindstone 19 is arranged below the fixed grindstone 18. The rotating grindstone 19 is fixedly supported on a drive shaft 32 constituting a drive structure 20 described later and is rotationally driven.

[0026] As shown in FIG. 3, in the center of the disk surface of the housing lid 8, a stepped hole with a small diameter on the upper side and a large diameter on the lower side is formed vertically through. The upper small-diameter hole portion serves as the raw material supply port 22, and the lower large-diameter hole portion serves as a mounting recess 23 for mounting the fixed grindstone 18. The fixed grindstone 18 is fixed to the housing lid 8 by fixing bolts 25 screwed through an insertion hole 24 formed in the housing lid 8. The supply port 22 is communicated with the hopper 4, and the raw material put into the hopper 4 is supplied into the processing chamber 1 through the supply port 22.

[0027] The hopper 4 and the housing lid 8 are connected by a connection structure 26 composed of a Herrule joint constituted by a pair of Herrule and a clamp band or the like. The hopper 4 is connected to the housing lid 8 by constructing the Herrule joint of the connection structure 26 and can be separated from the housing lid 8 by releasing the Herrule joint of the connection structure 26. In FIG. 3, reference numeral 27 is a packing for sealing the gap between the fixed grindstone 18 and the mounting recess 23.

[0028] As shown in Fig. 2, the drive structure 20 includes an electric motor 30 with a speed reducer that is suspended and supported by the bottom wall 11 and arranged in the machine chamber 3, a drive shaft 32 that is connected to the output shaft of the electric motor 30 via a coupling 31, and a cylindrical shaft receiver 33 that axially supports the drive shaft 32 around a vertical axis with built-in bearings. The shaft receiver 33 is supported by a bush 35 so as to be slidable in the vertical direction, and the bush 35 is fixed to the upper half of a cylindrical wall 34 that stands upright upward at the center of the bottom wall 11. The cylindrical wall 34 is provided in a state of penetrating the partition wall 16 vertically, and its upper end faces the processing chamber 1. Between the drive shaft 32 and the shaft receiver 33, between the shaft receiver 33 and the bush 35, and between the bush 35 and the cylindrical wall 34, they are sealed with an arbitrary sealing structure respectively.

[0029] As shown in Fig. 3, at the upper end of the drive shaft 32, a flange-shaped seat 36 for receiving the rotary grinding wheel 19 from below and a connecting shaft 37 that stands upright upward from the center of the seat 36 are integrally provided. The connecting shaft 37 consists of a round shaft with a male thread formed on the upper half of the tip side, and the rotary grinding wheel 19 received and supported by the seat 36 is fixed to the drive shaft 32 with a fastening nut 38 consisting of a hexagonal nut screwed onto the connecting shaft 37 and a lock nut 39 consisting of a cap nut.

[0030] As shown in Figs. 4 to 6, the fixed grinding wheel 18 includes a base 43A (43) made of a stainless steel disk body and abrasive grains 42A (42) made of synthetic diamond that are fixed to a grinding surface 44A (44) formed on the lower surface of the base 43A. A supply port 45A (central opening 45) for feeding raw materials between the two grinding wheels 18 and 19 is provided in a vertically penetrating manner at the center of the disk surface of the base 43A. The diameter of the supply port 45A is formed slightly larger than the diameter of the supply port 22. The lower surface of the base 43A is composed of a horizontal plane 48 provided in a ring shape at the outer peripheral edge and a concave surface 49 in the shape of a flat truncated cone that is recessed upward so as to be surrounded by the horizontal plane 48 and narrows upward. The grinding surface 44A is formed by these horizontal plane 48 and concave surface 49.

[0031] The abrasive grains 42A are arranged in groups at predetermined locations on the ground surface 44A. When the region where the abrasive grains 42A are arranged is defined as the abrasive grain fixing region 51A (51), the abrasive grain fixing region 51A is a horizontal plane 48, and includes a ring-shaped first region 52A (52) along the outer peripheral edge of the ground surface 44A, and a second region 54A (54) partially disposed in the inner region 53A (53) surrounded by the first region 52A. That is, the abrasive grains 42A are arranged on the horizontal plane 48 of the ground surface 44A and at predetermined locations on the concave surface 49. The second region 54A extends radially from the center side of the ground surface 44A and is formed radially by eight unit fixing portions 55A (55) arranged at equal angular positions in the circumferential direction. The width dimension of each unit fixing portion 55A is constant, and the unit fixing portion 55A is formed in a straight strip shape in which the sides partitioning it run straight outward. Between these unit fixing portions 55A, a non-fixing region 56A (56) where the abrasive grains 42A are not fixed is formed in a fan shape with an outward expansion.

[0032] In the middle part in the radial direction of each unit fixing part 55A, a blank part 57A (57) without abrasive grains 42A is formed. Here, the distances from the center of the base 43A to the blank part 57A in adjacent unit fixing parts 55A are made different. For example, in FIG. 5, the distance from the center of the base 43A to the blank part 57A in the unit fixing part 55A at the 12 o'clock position is set shorter than that (the distance from the center of the base 43A to the blank part 57A) in the unit fixing part 55A at the 1:30 position. Also, the distance from the center of the base 43A to the blank part 57A in the unit fixing part 55A at the 1:30 position is set longer than that (the distance from the center of the base 43A to the blank part 57A) in the unit fixing part 55A at the 3 o'clock position. In the present embodiment, the blank part 57A is formed such that the lengths of the distances alternate. From the above, in this fixed grinding wheel 18, as shown in FIG. 1(a), a virtual straight line L running in the radial direction through the center of the crushed surface 44A and the rotation locus T of the unit fixing part 55A when the base 43A is rotated are defined, and when the rotation loci T of all the unit fixing parts 55A are projected onto the virtual straight line L, it is possible to prevent the formation of a blank area where the rotation locus T is not projected onto the virtual straight line L in the inner region 53A.

[0033] The abrasive grain fixing region 51A is composed of a welded layer 58A formed by melting a metal piece made of a metal having a lower melting point than the metal constituting the base 43A and abrasive grains 42A held by this welded layer 58A. More specifically, the abrasive grains 42A in the abrasive grain fixing region 51A are fixed to the base 43A by a welded layer 58A formed by melting a metal piece made of nickel having a lower melting point than the stainless steel constituting the base 43A. The particle size of the abrasive grains 42A fixed to the second region 54A is set larger (coarser) than the particle size of the abrasive grains 42A fixed to the first region 52A.

[0034] The fixing of the abrasive grains 42A by the welding layer 58A is carried out by placing a nickel foil on the fixing portion of the abrasive grains 42A of the base 43A with the crushed surface 44A facing upward, further placing the abrasive grains 42A on the surface of the nickel foil, heating this in a heating furnace to melt only the nickel foil (metal piece), and then cooling the whole. By this, the nickel foil is melted and solidified to become the welding layer 58A, and the abrasive grains 42A can be held by the welding layer 58A. When placing the nickel foil and the abrasive grains 42A, by applying a flux or the like used for brazing to the surfaces of the base 43A and the nickel foil, the nickel foil can be temporarily fixed to the base 43A, and the abrasive grains 42A can be temporarily fixed to the nickel foil.

[0035] Since the inner region 53A of the fixed grinding stone 18 is constituted by the concave surface 49, there is a possibility that the melted nickel flows downward in the direction of the concave surface 49 during heating in the heating furnace, and the abrasive grains 42A arranged on the inner end side of the inner region 53A are buried in the welding layer 58. In the unit fixing portion 55 of the present embodiment, since the blank portion 57A is provided in the middle portion in the radial direction, the unit fixing portion 55 is divided into two (a plurality of) inner and outer parts with the blank portion 57A in between. Along with this, the nickel foil constituting the welding layer 58A is also divided into two (a plurality). Thereby, the amount of the nickel foil used for each of the inner and outer parts where the abrasive grains 42A are fixed is smaller than that of the unit fixing portion 55 without the blank portion 57A. Therefore, even when the melted nickel flows down, it is possible to suppress the abrasive grains 42A on the inner end side of the inner region 53A from being buried in the welding layer 58.

[0036] On the upper surface of the base 43A, four screw holes 60 into which the previous fixing bolts 25 are screwed are recessed, and each screw hole 60 is provided at equal intervals in the circumferential direction with respect to the center of the base 43A. Further, on the upper surface and the circumferential side surface of the base 43A, a circumferential groove 61 for mounting the packing 27 is recessed. The inner edge portion of the horizontal surface 48 is located below the outer edge portion of the concave surface 49, and a slight step is formed between the first region 52A and the inner region 53A.

[0037] As shown in FIGS. 4, 7, and 8, the rotary grinding wheel 19 includes a base 43B (43) made of a stainless steel disk body, and abrasive grains 42B (42) made of artificial diamond fixed to a crushing surface 44B (44) formed on the upper surface of the base 43B. A fixing hole 45B (central opening 45) through which the connecting shaft 37 of the drive structure 20 is inserted is provided in the center of the disk surface of the base 43B in a vertically penetrating manner. The inner diameter of the fixing hole 45B is formed to be substantially the same as the outer shape of the connecting shaft 37. The upper surface of the base 43B is composed of a horizontal outer horizontal plane 63 provided in a ring shape at the outer peripheral edge, a horizontal inner horizontal plane 64 provided in a ring shape at the edge of the fixing hole 45B, and a central horizontal plane 65 provided between both horizontal planes 63 and 64. The crushing surface 44B is formed by the outer horizontal plane 63 and the central horizontal plane 65 among these. The outer horizontal plane 63 constitutes a ring-shaped first region 52B (52), and the central horizontal plane 65 constitutes an inner region 53B (53). Further, the inner horizontal plane 64 constitutes the seating surface of a fastening nut 38 screwed onto the connecting shaft 37.

[0038] The abrasive grains 42B are arranged in groups at predetermined positions on the crushing surface 44B. When the region where the abrasive grains 42B are arranged in this way is defined as an abrasive grain fixing region 51B (51), the abrasive grain fixing region 51B is the outer horizontal plane 63, and is composed of a ring-shaped first region 52B along the outer peripheral edge of the crushing surface 44B and a second region 54B (54) partially arranged in the inner region 53B surrounded by the first region 52B. That is, the abrasive grains 42B are arranged at predetermined positions on the outer horizontal plane 63 and the central horizontal plane 65 of the crushing surface 44B. The second region 54B extends radially from the center side of the crushing surface 44B and is formed radially by eight strip-shaped unit fixing portions 55B arranged at equal angular positions in the circumferential direction. The width dimension of each unit fixing portion 55B is constant, and the unit fixing portion 55B is formed in a straight strip shape in which the sides partitioning it run straight outward. A non-fixing region 56B where the abrasive grains 42B are not fixed is formed in a fan shape with outward expansion between these unit fixing portions 55B.

[0039] The unit fixing portion 55B is composed of a first unit fixing portion 66 having a blank portion 57B without abrasive grains 42B at the radially inner end of the crushed surface 44B, a second unit fixing portion 67 not having the blank portion 57B, and a third unit fixing portion 68 formed between the first unit fixing portion 66 and the second unit fixing portion 67. The first unit fixing portion 66 and the second unit fixing portion 67 are alternately arranged in the circumferential direction. The third unit fixing portion 68 is formed in a fan shape with an outward expansion and is arranged to contact the first region 52B. From the above, in this rotary grinding wheel 19, as shown in FIG. 1(b), a virtual straight line L running in the radial direction passing through the center of the crushed surface 44B and a rotation locus T of the unit fixing portion 55B when the base 43B is rotated are defined, and when the rotation loci of all the unit fixing portions 55B are projected onto the virtual straight line L, it is possible to prevent the formation of a blank region where the rotation locus T is not projected onto the virtual straight line L in the inner region 53B.

[0040] The abrasive grain fixing region 51B is composed of a welding layer 58B formed by melting a metal piece made of a metal having a lower melting point than the metal constituting the base 43B and abrasive grains 42B held by the welding layer 58B. More specifically, the abrasive grains 42B of the abrasive grain fixing region 51B are fixed to the base 43B by a welding layer 58B formed by melting a metal piece made of nickel having a lower melting point than the stainless steel constituting the base 43B. The particle diameters of the abrasive grains 42B (the first and second unit fixing portions 66 and 67) fixed to the second region 54B are the same and are set larger (coarser) than the particle diameters of the abrasive grains 42B fixed to the first region 52B.

[0041] The fixing of the abrasive grains 42B by the welding layer 58B is carried out by placing a nickel foil on the fixing portion of the abrasive grains 42B of the base 43B with the crushed surface 44B facing upward, further placing the abrasive grains 42B on the surface of the nickel foil, heating this in a heating furnace to melt only the nickel foil (metal piece), and then cooling the whole. Thus, the nickel foil is melted and solidified to form the welding layer 58B, and the abrasive grains 42B can be held by the welding layer 58B. When placing the nickel foil and the abrasive grains 42B, by applying a flux or the like used for brazing on the surfaces of the base 43B and the nickel foil, the nickel foil can be temporarily fixed to the base 43B, and the abrasive grains 42B can be temporarily fixed to the nickel foil.

[0042] The inner edge of the outer horizontal surface 63 is located above the outer edge of the central horizontal surface 65, and a slight step is formed between the first region 52B and the inner region 53B. Also, the outer edge of the inner horizontal surface 64 is located above the inner edge of the central horizontal surface 65, and a slight step is formed between the seating surface of the fastening nut 38 and the inner region 53B. The lower surface of the base 43B has a recess formed upward at the portion that is received by the seat 36 of the drive structure 20.

[0043] As shown in FIG. 3, the diameter of the base 43A of the fixed grinding wheel 18 and the diameter of the base 43B of the rotary grinding wheel 19 are set to be the same, and both grinding wheels 18 and 19 are arranged in the processing chamber 1 such that the central axes of the base 43A and the base 43B coincide. Also, the first region 52A of the fixed grinding wheel 18 and the first region 52B of the rotary grinding wheel 19 are formed in the same shape, and the entire areas of the first regions 52A and 52B face each other. Between the two grinding wheels 18 and 19 set facing each other in the processing chamber 1, a vertically flat frustum-shaped space is formed at the portion where the inner regions 53A and 53B face each other. From the above, in the crushing process of the raw material, the raw material is roughened in the portion of the inner regions 53A and 53B between the two grinding wheels 18 and 19, and is finish-ground in the portion of the first regions 52A and 52B.

[0044] The grinding device is provided with a clearance adjustment structure 70 for adjusting the vertical clearance C between the fixed grinding wheel 18 and the rotating grinding wheel 19 which are arranged facing each other, specifically, the facing interval between the first region 52A of the grinding surface 44A of the fixed grinding wheel 18 and the first region 52B of the grinding surface 44B of the rotating grinding wheel 19. As shown in FIG. 2, the clearance adjustment structure 70 includes an operation shaft 71 that can be rotated around a horizontal axis, a driving gear 72 that is rotated around a vertical axis by the operation shaft 71, a driven gear 73 that is integrally provided at the lower end of the shaft receiver 33 and meshes with the driving gear 72, and a screw mechanism composed of male and female screw portions 74 and 75 provided between the shaft receiver 33 and the cylindrical wall 34, etc.

[0045] The operation shaft 71 penetrates the peripheral wall 10 inside and outside below the hinge body 9, the tip thereof protrudes outside the housing 2, and the base end portion is located inside the housing 2. The base end portion of the operation shaft 71 is connected to a conversion mechanism 76, and the rotation of the operation shaft 71 is converted into rotation around a vertical axis while being decelerated by the conversion mechanism 76 and transmitted to the driving gear 72. The screw mechanism is a right-handed screw, the female screw portion 74 is formed in the lower half of the inner surface of the cylindrical wall 34, and the male screw portion 75 is formed in the lower half of the outer surface of the shaft receiver 33. The conversion mechanism 76 is arranged in the lower region of the housing 2 partitioned by the partition wall 16, and the driving gear 72 and the driven gear 73 are arranged in the machine chamber 3.

[0046] When the operating shaft 71 is rotated clockwise about its axis, the driving gear 72 is rotated clockwise in a plan view by the conversion mechanism. Receiving the rotation of the driving gear 72, the driven gear 73 rotates counterclockwise, and the shaft receiver 33 also rotates counterclockwise together with the driven gear 73. When the shaft receiver 33 rotates counterclockwise, the shaft receiver 33 moves upward by a screw mechanism composed of a right-handed screw, so that the entire driving shaft 32 is displaced upward, and the clearance C between the fixed grinding wheel 18 and the rotating grinding wheel 19 becomes smaller (narrower). Conversely, when the operating shaft 71 is rotated counterclockwise about its axis, the driving gear 72 and the driven gear 73 are rotated in the opposite direction to the above, and the shaft receiver 33 moves downward by the screw mechanism, so that the entire driving shaft 32 is displaced downward, and the clearance C between the fixed grinding wheel 18 and the rotating grinding wheel 19 becomes larger (wider). The vertical displacement of the driving shaft 32 is absorbed by the coupling 31, and the rotational power of the electric motor 30 is transmitted to the driving shaft 32 without problems.

[0047] The attachment and detachment of both grinding wheels 18 and 19 can be performed with the housing lid 8 shown in FIG. 9 switched to the open position. The fixed grinding wheel ********** separated from the crushing device attaches packings 27 and 27 to the two grooves 61 and 61 respectively, then fits the fixed grinding wheel 18 into the mounting recess 23, and in this state, the fixing bolt 25 is screwed into the screw hole 60 through the insertion hole 24 from the outer surface side of the housing lid 8, so that it can be attached to the housing lid 8. Also, the rotating grinding wheel 19 separated from the crushing device is received and supported by the receiving seat 36 with the connecting shaft 37 inserted through the fixing hole 45B, and in this state, the fastening nut 38 and the lock nut 39 are sequentially screwed onto the connecting shaft 37, so that it can be attached to the drive structure 20.

[0048] Conversely, the fixed grinding wheel 18 attached to the housing lid 8 can be separated by loosening the fixing bolt 25, removing the fixing bolt 25, and pulling it out from the mounting recess 23. Also, the rotating grinding wheel 19 attached to the drive structure 20 can be separated by loosening the lock nut 39 and the fastening nut 38, removing it from the connecting shaft 37, and lifting it upward. It should be noted that there is an information loss in the translation of the content in in the original text you provided. The part "**********" is not clear in the original, so it cannot be accurately translated. You can check and supplement the complete information for a more accurate translation.

[0049] When the electric motor 30 is started, the rotary grinding wheel 19 is rotationally driven, and it becomes possible to perform crushing processing. When soybeans (raw materials) immersed in water, for example, are put into the hopper 4, the soybeans are supplied between the two grinding wheels 18 and 19 in the processing chamber 1 through the supply port 22 and the supply port 45A from the lower end of the hopper 4. At this time, the top of the lock nut 39 screwed onto the connecting shaft 37 of the rotary grinding wheel 19 serves as a guide, and the soybeans are dispersedly supplied around the lock nut 39 (around the rotation center of the rotary grinding wheel 19). The soybeans supplied between the two grinding wheels 18 and 19 are coarsely ground by the abrasive grains 42A and 42B fixed to the both inner regions 53A and 53B while moving between the both crushing surfaces 44A and 44B from the center side to the outer peripheral side of the two grinding wheels 18 and 19. At the time of coarse grinding, mainly when the unit fixing portion 55A of the fixed grinding wheel 18 and the unit fixing portion 55B of the rotating rotary grinding wheel 19 face each other, the soybeans intervening between the both unit fixing portions 55A and 55B are crushed by the both abrasive grains 42A and 42B.

[0050] At the time of coarse grinding, in the non-fixed regions 56A and 56B provided in the both inner regions 53A and 53B, the soybeans are not caught by the abrasive grains 42A and 42B, and the crushed soybeans can smoothly move toward the outer peripheral side of the two grinding wheels 18 and 19. Also, due to the blank portions 57A and 57B, the soybeans in the non-fixed regions 56A and 56B can move to the adjacent non-fixed regions 56A and 56B, so that the movement of the raw material becomes complicated and the raw material and the abrasive grains 42A and 42B come into sufficient contact. At this time, the soybeans that have passed through the blank portions 57A and 57B of the unit fixing portions 55A and 55B and moved to the adjacent non-fixed regions 56A and 56B come into contact with the abrasive grains 42A and 42B at the unit fixing portions 55A and 55B on the downstream side of the movement. Therefore, the contact opportunity between the abrasive grains 42A and 42B and the soybeans is not impaired by providing the blank portions 57A and 57B, and the soybeans are appropriately coarsely ground.

[0051] The soybeans that have been roughly ground and reached near the outer periphery of the inner regions 53A and 53B are finished being ground between the two first regions 52A and 52B and discharged outside the two grindstones 18 and 19 from between the outer peripheral edges of the two ground surfaces 44A and 44B. The ground soybeans received on the inner surface of the processing chamber 1 flow down the peripheral wall 10 and the partition wall 16 and are discharged from the discharge pipe 15 to the outside of the housing 2. When it is desired to grind the soybeans more finely from the ground state, the operation shaft 71 of the gap adjustment structure 70 is rotated in the clockwise direction to reduce the clearance C between the two grindstones 18 and 19. When it is desired to grind them roughly, the operation shaft 71 of the gap adjustment structure 70 is rotated in the counterclockwise direction to increase the clearance C between the two grindstones 18 and 19.

[0052] As described above, in the grinding stone 17 that constitutes the fixed grindstone 18 and the rotating grindstone 19 of the present embodiment, a grain fixing region 51 in which a large number of abrasive grains 42 are arranged in groups on the grinding surface 44 is formed by a ring-shaped first region 52 along the outer peripheral edge of the grinding surface 44 and a second region 54 partially arranged in the inner region 53 surrounded by the first region 52. A non-fixing region 56 without abrasive grains 42 is formed in the portion of the inner region 53 excluding the second region 54. According to the grinding stone 17 with the non-fixing region 56 without abrasive grains 42 formed on the grinding surface 44 in this way, compared with the conventional grindstone in which abrasive grains are fixed to the entire one surface of the metal disk, the total amount of the abrasive grains 42 to be fixed can be reduced by the amount of the non-fixing region 56 provided.

[0053] For example, when a ring-shaped unit fixing portion 102 and a ring-shaped non-fixing region 103 are alternately formed in the inner region 101 in the inner and outer directions as in the crushed grinding wheel 100 of the reference example in FIG. 13, when the rotation locus T of all the unit fixing portions 102 is projected onto the virtual straight line L, a blank region where the rotation locus T is not projected is formed on the virtual straight line L in the inner region 101. When the ring-shaped non-fixing region 103 is formed in this way and the blank region is formed, in the blank region, the raw material is not crushed, and it is inevitable that the processing ability of the crushed grinding wheel is reduced. In addition, the raw material stays in the blank region and does not move smoothly outward, and in this respect too, it is inevitable that the processing ability is reduced. On the other hand, as in the present embodiment, the second region 54 is composed of a plurality of unit fixing portions 55 arranged in a dispersed manner in the inner region 53, and a virtual straight line L that runs radially through the center of the crushing surface 44 and the rotation locus T of the unit fixing portion 55 when the base 43 is rotated are defined. When the rotation locus T of all the unit fixing portions 55 is projected onto the virtual straight line L, if it is configured such that a blank region where the rotation locus T is not projected is not formed on the virtual straight line L in the inner region 53, the problem that the raw material is not crushed due to the blank region as described above does not occur, and the raw material existing in the inner region 53 can be surely brought into contact with the abrasive grains 42. Therefore, the processing ability of the crushed grinding wheel can be improved. In addition, if a non-fixing region 56 without abrasive grains 42 is formed on the crushing surface 44, the raw material can be smoothly moved outward through the non-fixing region 56. Therefore, it is possible to suppress the occurrence of "jamming" in which the crushed raw material is caught by the abrasive grains 42, and in this respect too, the processing ability of the crushed grinding wheel can be improved. From the above, according to the present embodiment, the raw material existing in the inner region 53 can be surely brought into contact with the abrasive grains 42 and smoothly moved outward. Therefore, a crushed grinding wheel with excellent processing ability can be obtained.

[0054] When the abrasive grain fixing region 51 is composed of a welded layer 58 formed by melting a metal piece made of a metal having a melting point lower than that of the metal constituting the base 43 and formed on the surface of the crushed surface 44, and abrasive grains 42 held by the welded layer 58, the metal piece and the abrasive grains 42 are placed on portions corresponding to the unit fixing portions 55 of the first region 52 and the second region 54 of the base 43, heated in a heating furnace to melt only the metal piece, and then cooled. Thus, the abrasive grains 42 can be held and fixed by the welded layer 58 made of the melted and solidified metal piece. Therefore, the abrasive grains 42 can be reliably fixed at a desired site on the crushed surface 44. Incidentally, in the form of fixing abrasive grains by electrodeposition, abrasive grains can only be formed on the entire surface of the crushed surface. However, according to the present embodiment, the abrasive grains 42 can be partially fixed at a desired site on the crushed surface 44.

[0055] The grinding stone 17 set in the processing chamber 1 is composed of a non-rotating fixed grinding stone 18 and a rotating grinding stone 19 that receives a driving force and rotates. The second region 54A of the fixed grinding stone 18 extends radially from the center side of the crushed surface 44A and is formed radially by a plurality of belt-shaped unit fixing portions 55A arranged at equal angular positions in the circumferential direction. A non-fixing region 56A partitioned by adjacent unit fixing portions 55A can be formed in a fan shape that expands outward. According to this, the unit fixing portions 55A and the non-fixing regions 56A are evenly distributed in the circumferential direction of the inner region 53A, so that the raw material can be uniformly brought into contact with the abrasive grains 42 and crushed throughout the inner region 53A. Also, the raw material can be uniformly moved outward throughout the inner region 53A.

[0056] If a blank portion 57A without abrasive grains is formed in the intermediate portion in the radial direction or the inner and outer end portions in the radial direction of the crushed surface 44A in each unit fixing portion 55A, the raw material can move between adjacent non-fixing regions 56A·56A with the unit fixing portion 55A interposed therebetween through the blank portion 57A. As a result, since the raw material can be moved not only outward in the inner region 53A but also in the circumferential direction, the movement of the raw material between the two grindstones 18·19 can be complicated, and the contact opportunity between the raw material and the abrasive grains 42A can be increased. Further, if the distances from the center of the crushed surface 44A to the blank portion 57A in the adjacent unit fixing portions 55A are different from each other, it is possible to prevent the raw material that has moved to the adjacent non-fixing region 56A through the blank portion 57A from continuously moving to the further adjacent non-fixing region 56A through the blank portion 57A. Therefore, it is possible to prevent the contact opportunity between the raw material and the abrasive grains 42A after moving through the blank portion 57A from being impaired, and the crushing process can be advanced more reliably.

[0057] The grindstone 17 set in the processing chamber 1 is composed of a fixed grindstone 18 that does not rotate and a rotating grindstone 19 that receives a driving force and rotates. The second region 54B of the rotating grindstone 19 extends radially from the center side of the crushed surface 44B and is formed radially by a plurality of belt-shaped unit fixing portions 55B arranged at equal angular positions in the circumferential direction. The non-fixing region 56B partitioned by the adjacent unit fixing portions 55 can be formed in a fan shape that expands outward. According to this, the unit fixing portion 55B and the non-fixing region 56B are evenly dispersed and arranged in the circumferential direction of the inner region 53B in the same manner as above, so that the raw material and the abrasive grains 42B are brought into contact with each other uniformly throughout the inner region 53B for crushing, and the raw material can be uniformly moved outward throughout the inner region 53B. Further, by evenly dispersing the abrasive grains 42B in the circumferential direction of the crushed surface 44B, the center of gravity of the rotating grindstone 19 can be aligned with the central axis of the metal disk body forming the base 43B, and the weight balance in the circumferential direction of the rotating grindstone 19 can be made uniform. Therefore, it is possible to prevent the crushing device from vibrating due to the deviation of the center of gravity and balance of the rotating grindstone 19.

[0058] If the unit fixing part 55B is composed of a first unit fixing part 66 having a blank part 57B without abrasive grains at a midway part in the radial direction of the crushed surface 44B or at the inner and outer ends in the radial direction, and a second unit fixing part 67 not having the blank part 57B, the raw material can be moved between adjacent non-fixing regions 56B·56B with the first unit fixing part 66 interposed via the blank part 57B. As a result, in addition to the outward direction of the inner region 53B, the raw material can also be moved in the circumferential direction, so that the movement of the raw material between the two grindstones 18·19 can be complicated, and the contact opportunity between the raw material and the abrasive grains 42B can be increased. Further, if the first unit fixing part 66 and the second unit fixing part 67 are alternately arranged in the circumferential direction, it is possible to prevent the raw material that has moved to the adjacent non-fixing region 56B via the blank part 57B from continuously moving to the further adjacent non-fixing region 56B via the blank part 57B. Therefore, it is possible to prevent the contact opportunity between the raw material and the abrasive grains 42B after moving through the blank part 57B from being impaired, and the crushing process can be advanced more reliably.

[0059] If the second region 54B is formed between the first unit fixing part 66 and the second unit fixing part 67 and includes a third unit fixing part 68 formed in a fan shape that expands outward and contacts the first region 52B, the abrasive grains 42B fixed to the third unit fixing part 68 can be brought into contact with the raw material immediately before reaching the first region 52B. Thereby, the contact opportunity between the raw material and the abrasive grains 42B can be increased, and the raw material can be crushed more accurately.

[0060] According to a crushing device including a fixed grindstone 18 and a rotating grindstone 19 arranged facing each other in the processing chamber 1, and the fixed grindstone 18 and the rotating grindstone 19 are constituted by the above-mentioned crushing grindstone 17, it is possible to obtain a crushing device in which clogging of the grindstones 18·19 hardly occurs and which is excellent in processing ability. Further, since the manufacturing cost of the fixed grindstone 18 and the rotating grindstone 19 can be suppressed, the overall cost of the crushing device can be suppressed.

[0061] Figure 12 shows another embodiment of the crushing grindstone according to the present invention. In the second region 54 of this embodiment, four outwardly spreading fan-shaped unit fixing portions 55 formed intermittently are formed at the inner peripheral portion, the outer peripheral portion, and the central portion of the inner and outer peripheral portions of the inner region 53. The rotation locus T of the unit fixing portions 55 formed in the inner, outer, and central portions is formed in a state where they slightly overlap in the unit fixing portions 55 adjacent to each other inside and outside. Also in this crushing grindstone 17, a virtual straight line L running radially through the center of the crushing surface 44 and the rotation locus T of the unit fixing portion 55 when the base 43 is rotated are defined, and when the rotation locus T of all the unit fixing portions 55 is projected onto the virtual straight line L, it is configured such that no blank region where the rotation locus T is not projected is formed on the virtual straight line L in the inner region 53.

[0062] The materials of the abrasive grains 42, the base 43, and the welding layer 58, the position of the blank portion 57, and the form of the unit fixing portion 55 are not limited to those of the above embodiment.

Explanation of Reference Numerals

[0063] 1 Processing chamber 17 Crushing grindstone 18 Fixed grindstone 19 Rotating grindstone 42 Abrasive grains 43 Base 44 Crushing surface 45 Central opening 51 Abrasive grain fixing region 52 First region 53 Inner region 54 Second region 55 Unit fixing portion 56 Non-fixing region 57 Blank portion 58 Welding layer 66 First unit fixing portion 67 Second unit fixing portion 68 Third unit fixing portion L Virtual straight line running radially through the center of the crushing surface T Rotation locus of the unit fixing portion when the base is rotated

Claims

【Claim 1】 A grinding stone set inside a processing chamber (1) of a crushing device for crushing raw materials introduced into the processing chamber (1), comprising: a base (43) made of a metal disk body having a central opening (45) and a crushing surface (44) on either the upper or lower surface excluding the central opening (45); and a plurality of abrasive grains (42) fixed to the crushing surface (44) of the base (43), a grain fixing region (51A(51)) in which a plurality of abrasive grains (42) are arranged in a group on the crushing surface (44) is composed of a ring-shaped first region (52A(52)) along the outer peripheral edge of the crushing surface (44) and a second region (54A(54)) partially arranged in an inner region (53A(53)) surrounded by the first region (52A(52)), a non-fixing region (56A(56)) without abrasive grains (42) is formed in a portion of the inner region (53A(53)) excluding the second region (54A(54)), the second region (54A(54)) is composed of a plurality of unit fixing portions (55A(55)) dispersed in the inner region (53A(53)), the second region (54A(54)) extends radially from the center side of the crushing surface (44A(44)) and is formed radially by a plurality of strip-shaped unit fixing portions (55A(55)) arranged at equal angular positions in the circumferential direction, a non-fixing region (56A(56)) partitioned by adjacent unit fixing portions (55A(55)) is formed in a fan shape with an outward expansion, each unit fixing portion (55A(55)) is formed with a blank portion (57A(57)) without abrasive grains in a middle portion in the radial direction or inner and outer end portions in the radial direction of the crushing surface (44A(44)), the distances from the center of the crushing surface (44A(44)) to the blank portion (57A(57)) in adjacent unit fixing portions (55A(55)) are different from each other, a virtual straight line (L) running radially through the center of the crushing surface (44) and a rotation locus (T) of the unit fixing portion (55A(55)) when the base (43) is rotated are defined, and when the rotation loci (T) of all the unit fixing portions (55A(55)) are projected onto the virtual straight line (L), a crushing grinding stone, characterized in that a blank region where the rotation locus (T) is not projected onto the virtual straight line (L) in the inner region (53A(53)) is not formed. Claim 2: A grinding stone set inside a processing chamber (1) of a crushing device for performing a crushing process on raw materials introduced into the processing chamber (1), comprising a base (43) made of a metal disk body having a central opening (45) and a crushing surface (44) on either the upper or lower surface excluding the central opening (45), and a plurality of abrasive grains (42) fixed to the crushing surface (44) of the base (43), wherein an abrasive grain fixing region (51B(51)) formed by arranging a plurality of abrasive grains (42) in a group on the crushing surface (44) is composed of a ring-shaped first region (52B(52)) along the outer peripheral edge of the crushing surface (44) and a second region (54B(54)) partially arranged in an inner region (53B(53)) surrounded by the first region (52B(52)), a non-fixing region (56B(56)) without abrasive grains (42) is formed in a portion of the inner region (53B(53)) excluding the second region (54B(54)), the second region (54B(54)) is composed of a plurality of unit fixing parts (55B(55)) dispersed in the inner region (53B(53)), the second region (54B(54)) extends radially from the center side of the crushing surface (44B(44)) and is formed radially by a plurality of strip-shaped unit fixing parts (55B(55)) arranged at equal angular positions in the circumferential direction, a non-fixing region (56B(56)) partitioned by adjacent unit fixing parts (55B(55)) is formed in a fan shape that expands outward, the unit fixing part (55B(55)) is composed of a first unit fixing part (66) having a blank part (57B(57)) without abrasive grains at a middle part in the radial direction or at the inner and outer ends in the radial direction of the crushing surface (44B(44)), and a second unit fixing part (67) not having the blank part (57B(57)), the first unit fixing part (66) and the second unit fixing part (67) are arranged alternately in the circumferential direction, a virtual straight line (L) running radially through the center of the crushing surface (44) and a rotation locus (T) of the unit fixing part (55B(55)) when the base (43) is rotated are defined, and when the rotation loci (T) of all the unit fixing parts (55B(55)) are projected onto the virtual straight line (L), a blank region where the rotation locus (T) is not projected onto the virtual straight line (L) in the inner region (53B(53)) is not formed. The crushing grinding stone is characterized by this configuration. **Claim 3**: The second region (54B (54)) is formed between the first unit fixing portion (66) and the second unit fixing portion (67), and includes a third unit fixing portion (68) formed in a fan shape with an outward extension that contacts the first region (52B (52)). The rubbing grinding wheel according to claim 2. **Claim 4**: The abrasive grain fixing region (51) is composed of a welding layer (58) formed by melting a metal piece made of a metal having a melting point lower than that of the metal constituting the base (43), which is formed on the surface of the rubbing surface (44), and abrasive grains (42) held by the welding layer (58). The rubbing grinding wheel according to claim 1 or 2. **Claim 5**: A rubbing device comprising a fixed grinding wheel (18) and a rotating grinding wheel (19) that are set facing each other in the processing chamber (1). The fixed grinding wheel (18) is composed of the rubbing grinding wheel (17) according to claim 1, and the rotating grinding wheel (19) is composed of the rubbing grinding wheel (17) according to claim 2.

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