Combined type grinding device for bearing ring

Abstract

The utility model discloses a combined type grinding device for a bearing ring, which relates to the technical field of bearing ring grinding device design and comprises a fixed bottom plate, a bearing ring fixing unit and a grinding unit, four corners of the lower side surface of the fixed bottom plate are respectively and fixedly connected with a supporting leg, and the four corners of the fixed bottom plate are respectively provided with a circular chamfer. The bearing ring fixing unit comprises a fixing disc, an electric push rod, a fixing top plate, a rotating seat, a rotating cylinder I and a rotating roller, the fixing disc is fixedly connected to the upper side surface of the fixing bottom plate, the grinding unit is arranged on the fixing disc, and four clamping plates in an annular array are fixedly connected to the upper side surface of the fixing disc. The upper side surface of each clamping plate is fixedly connected with two rotating seats at equal intervals, the inner ring, the outer ring, the upper side surface and the lower side surface can be ground at the same time, the device does not need to be disassembled and assembled repeatedly, and the grinding efficiency of the bearing ring is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing ring grinding device design, in particular to a bearing ring composite grinding device. Background Art

[0002] Bearing is an important component in modern mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. The bearing consists of an inner ring, an outer ring, a rolling element, a cage, and a ring. In the production process of the bearing ring, in order to make the bearing surface smoother, the bearing ring needs to be processed, so a bearing ring composite grinding device is needed.

[0003] The existing bearing ring composite grinding device cannot grind the inner ring, outer ring, upper surface and lower surface at the same time when in use, and needs to be disassembled and assembled many times, which affects the grinding efficiency of the bearing ring. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a bearing ring composite grinding device, which can grind the inner ring, outer ring, upper surface and lower surface at the same time when in use, without the need for multiple disassembly and assembly of the device, without affecting the grinding efficiency of the bearing ring, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bearing ring composite grinding device, comprising a fixed base plate, a bearing ring fixing unit, and a grinding unit;

[0006] Fixed bottom plate: The four corners of the lower surface are respectively fixedly connected to a supporting leg, and the four corners of the fixed bottom plate are respectively provided with circular chamfers;

[0007] The bearing ring fixing unit comprises a fixed disc, an electric push rod, a fixed top plate, a rotating seat, a rotating cylinder and a rotating roller. The upper surface of the fixed bottom plate is fixedly connected to a fixed disc, and a grinding unit is arranged on the fixed disc. The upper surface of the fixed disc is fixedly connected to four annular array clamping plates, and the upper surface of each clamping plate is respectively fixedly connected to two rotating seats with equal spacing, and each rotating seat is respectively rotatably connected to a rotating cylinder, and each rotating cylinder is respectively fixedly sleeved with a rotating roller, and the upper surface of the fixed bottom plate located on the left and right sides of the fixed disc is respectively fixedly connected to an electric push rod, and the upper ends of the two electric push rods are fixedly connected to a fixed top plate, and the input end of the electric push rod is electrically connected to the output end of an external power supply through an external control switch group.

[0008] The fixed bottom plate is used to fix the installation device, the supporting legs are used to support the device, the fixed disc is used to fix the workpiece, the electric push rod is used to drive the fixed top plate to move, the fixed top plate is used to drive the rotating cylinder two to move, so that the rotating cylinder two and the rotating cylinder two can be clamped, the fixed top plate is used to fix the rotating cylinder two, the rotating seat is used to rotate the rotating cylinder one, the rotating cylinder one is used to fix the rotating cylinder one, the rotating cylinder one is used to contact the bearing ring to facilitate the rotation of the bearing ring, so as to perform grinding processing, and the bearing ring is placed between the two rotating cylinders to rotate the bearing ring for use.

[0009] Furthermore, the bearing ring fixing unit also includes a rotating cylinder 2 and a transmission gear 1. The positions corresponding to each rotating cylinder 1 on the fixed top plate are rotatably connected to the rotating cylinder 2 through bearings. Each rotating cylinder 2 passes through the upper and lower sides of the fixed top plate respectively. A transmission gear 1 is fixedly sleeved on the position of each rotating cylinder 2 located on the upper side of the fixed top plate. Among all the transmission gears 1, two transmission gears 1 corresponding to the clamping plate are meshed and connected with each other.

[0010] The transmission gear 1 is used to rotate the rotating cylinder 2 of the outer ring, so as to rotate all the rotating cylinders 2, to facilitate the rotation of all the rotating cylinders 2, and to provide power for the rotation of the rotating cylinders 2.

[0011] Furthermore, the bearing ring fixing unit also includes a transmission gear 2, a rotating motor, a transmission gear 3 and a fixed cylinder. The upper surface of the fixed top plate is located between all the rotating cylinders 2 and is fixedly connected to a rotating motor. The output shaft on the rotating motor is fixedly connected to the fixed cylinder. A transmission gear 3 is fixedly sleeved on the fixed cylinder. The four rotating cylinders 2 located on the inner ring are respectively fixedly sleeved with transmission gears 2. The four transmission gears 2 are respectively arranged on the upper side of the transmission gear 1. The transmission gear 3 is meshed with the four transmission gears 2. The input end of the rotating motor is electrically connected to the output end of the external power supply through an external control switch group.

[0012] The rotating motor starts to rotate the fixed cylinder, the fixed cylinder rotates to rotate the transmission gear three, the transmission gear three rotates to rotate the four transmission gears two, the transmission gear two rotates to rotate the corresponding rotating cylinder two, to provide power for the rotation of rotating cylinder two, which is convenient for use.

[0013] Furthermore, the bearing ring fixing unit also includes a cross clamping groove and a cross clamping block. The upper surface of each rotating cylinder one is respectively provided with a cross clamping groove, and the lower surface of each rotating cylinder two is respectively fixedly connected to a cross clamping block. All cross clamping blocks are respectively fixedly clamped with the corresponding cross clamping grooves, and all rotating cylinders two are respectively fixedly clamped with the rotating cylinder one through the cross clamping blocks.

[0014] The cross clamping groove and the cross clamping block are clamped to allow the rotating cylinder 2 to be clamped with the corresponding rotating cylinder 1, so as to facilitate the rotation of the rotating cylinder 1 and facilitate the taking and placing of materials.

[0015] Furthermore, the grinding unit includes a lower section grinding plate and an upper end surface grinding plate. The upper side surface of the fixed disc is located between the four clamping plates and is respectively fixedly connected to a lower section grinding plate. The four lower section grinding plates are arranged in a ring. The lower side surface of the fixed top plate is located at the positions corresponding to the four lower section grinding plates and is respectively fixedly connected to an upper end surface grinding plate.

[0016] The lower section grinding plate contacts the lower surface of the bearing ring, and the upper end surface grinding plate is used to contact the upper surface of the bearing ring to grind the upper and lower sides of the bearing ring. By rotating the bearing ring, the outer side of the bearing ring is ground at the same time, thereby achieving composite grinding to improve grinding efficiency.

[0017] Furthermore, the grinding unit also includes a fixed support frame, a hydraulic cylinder and an arc-shaped grinding plate. The upper surface of the fixed disc and the upper surface of the fixed base plate are respectively fixedly connected to a fixed support frame, and each fixed support frame is respectively fixedly connected to a hydraulic cylinder. The corresponding sides of the two hydraulic cylinders are respectively fixedly connected to an arc-shaped grinding plate, and the two arc-shaped grinding plates correspond to one of the lower section grinding plates respectively.

[0018] The fixed support frame is used to fix the hydraulic cylinder, the hydraulic cylinder is used to adjust the position of the arc-shaped grinding plate, and the arc-shaped grinding plate is used to contact the inner surface and the outer surface of the bearing ring, so as to grind the inner and outer sides of the bearing ring.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The bearing ring composite grinding device has the following advantages: a bearing ring fixing unit is provided, a fixing disc is used to fix the workpiece, an electric push rod is used to drive the fixed top plate to move, the fixed top plate is used to drive the rotating cylinder 2 to move, the rotating motor is started to rotate the fixed cylinder, the fixed cylinder rotates to rotate the transmission gear 3, the transmission gear 3 rotates to rotate the four transmission gears 2, the transmission gear 2 rotates to rotate the corresponding rotating cylinder 2, to provide power for the rotation of the rotating cylinder 2, the transmission gear 1 is used to rotate the outer ring The movable cylinder 2 rotates to make all the movable cylinders 2 rotate, so as to facilitate the rotation of all the movable cylinders 2, so as to make the movable cylinders 2 clamped with the movable cylinders 2, the fixed top plate is used to fix the movable cylinder 2, the rotating seat is used to rotate the movable cylinder 1, the movable cylinder 1 is used to fix the movable cylinder 1, and the movable cylinder 1 is used to contact the bearing ring, so as to facilitate the rotation of the bearing ring, so as to perform grinding processing, the cross clamping groove and the cross clamping block are clamped, so as to make the movable cylinder 2 clamped with the corresponding movable cylinder 1, so as to fix the bearing ring;

[0021] 2. The composite grinding device for bearing rings has the following advantages: a grinding unit is provided, the lower section grinding plate contacts the lower surface of the bearing ring, the upper end surface grinding plate contacts the upper surface of the bearing ring, the upper and lower sides of the bearing ring are ground, the outer side of the bearing ring is ground at the same time by rotating the bearing ring, the fixed support frame is used to fix the hydraulic cylinder, the hydraulic cylinder is used to adjust the position of the arc-shaped grinding plate, and the arc-shaped grinding plate is used to contact the inner and outer surfaces of the bearing ring for grinding;

[0022] 3. The composite grinding device for bearing rings has the following advantages: when in use, the inner ring, outer ring, upper surface and lower surface can be ground simultaneously without multiple disassembly and assembly of the device, which does not affect the grinding efficiency of the bearing rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the back structure of the utility model;

[0025] Figure 3 It is a schematic diagram of the partial structure of the rotating cylinder 1 and the rotating cylinder 2 of the utility model.

[0026] In the figure: 1 fixed bottom plate, 2 support leg, 3 bearing ring fixing unit, 31 fixed disc, 32 electric push rod, 33 fixed top plate, 34 rotating seat, 35 rotating cylinder 1, 36 rotating roller, 37 rotating cylinder 2, 38 transmission gear 1, 39 transmission gear 2, 310 rotating motor, 311 transmission gear 3, 312 fixed cylinder, 313 cross clamping groove, 314 cross clamping block, 4 grinding unit, 41 lower section grinding plate, 42 upper end surface grinding plate, 43 fixed support frame, 44 hydraulic cylinder, 45 arc grinding plate. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-3 , This embodiment provides a technical solution: a bearing ring composite grinding device, comprising a fixed base plate 1, a bearing ring fixing unit 3, and a grinding unit 4;

[0029] Fixed bottom plate 1: The four corners of the lower surface are respectively fixedly connected to a support leg 2, and the four corners of the fixed bottom plate 1 are respectively provided with circular chamfers;

[0030] The bearing ring fixing unit 3 comprises a fixed disc 31, an electric push rod 32, a fixed top plate 33, a rotating seat 34, a rotating cylinder 35 and a rotating roller 36. A fixed disc 31 is fixedly connected to the upper surface of the fixed bottom plate 1, and a grinding unit 4 is arranged on the fixed disc 31. The upper surface of the fixed disc 31 is fixedly connected to four annular array clamping plates, and the upper surface of each clamping plate is respectively fixedly connected to two rotating seats 34 with equal spacing, and each rotating seat 34 is respectively rotatably connected to a rotating cylinder 35, and each rotating cylinder 35 is respectively fixedly sleeved with a rotating roller 36. The upper surface of the fixed bottom plate 1 is located on the left and right sides of the fixed disc 31, and the upper ends of the two electric push rods 32 are fixedly connected to a fixed top plate 33. The input end of the electric push rod 32 is electrically connected to the output end of the external power supply through an external control switch group.

[0031] The fixed bottom plate 1 is used to fix the installation device, the support leg 2 is used to support the device, the fixed disc 31 is used to fix the workpiece, the electric push rod 32 is used to drive the fixed top plate 33 to move, the fixed top plate 33 is used to drive the rotating cylinder 2 37 to move, so that the rotating cylinder 2 37 and the rotating cylinder 2 37 are clamped, the fixed top plate 33 is used to fix the rotating cylinder 2 37, the rotating seat 34 is used to rotate the rotating cylinder 1 35, the rotating cylinder 1 35 is used to fix the rotating cylinder 1 35, the rotating cylinder 1 35 is used to contact the bearing ring to facilitate the rotation of the bearing ring, so as to perform grinding processing, and the bearing ring is placed between the two rotating cylinders 1 35 to rotate the bearing ring for use.

[0032] The bearing ring fixing unit 3 also includes a rotating cylinder 2 37 and a transmission gear 1 38. The positions corresponding to each rotating cylinder 1 35 on the fixed top plate 33 are rotatably connected to the rotating cylinder 2 37 through bearings. Each rotating cylinder 2 37 passes through the upper and lower sides of the fixed top plate 33 respectively. A transmission gear 1 38 is fixedly sleeved on the position of each rotating cylinder 2 37 located on the upper side of the fixed top plate 33. Among all the transmission gears 1 38, two transmission gears 1 38 corresponding to the clamping plate are meshed and connected with each other.

[0033] The transmission gear 1 38 is used to rotate the rotating cylinder 2 37 of the outer ring, so as to rotate all the rotating cylinders 2 37, to facilitate the rotation of all the rotating cylinders 2 37, and to provide power for the rotation of the rotating cylinders 2 37.

[0034] The bearing ring fixing unit 3 also includes a transmission gear 2 39, a rotating motor 310, a transmission gear 3 311 and a fixed cylinder 312. The upper surface of the fixed top plate 33 is located between all the rotating cylinders 2 37 and is fixedly connected to a rotating motor 310. The output shaft on the rotating motor 310 is fixedly connected to the fixed cylinder 312. A transmission gear 3 311 is fixedly sleeved on the fixed cylinder 312. The four rotating cylinders 2 37 located on the inner ring are respectively fixedly sleeved with transmission gears 2 39. The four transmission gears 2 39 are respectively arranged at the upper side of the transmission gear 1 38. The transmission gear 3 311 is meshed and connected with the four transmission gears 2 39. The input end of the rotating motor 310 is electrically connected to the output end of the external power supply through an external control switch group.

[0035] The rotating motor 310 is started to rotate the fixed cylinder 312, the fixed cylinder 312 rotates to rotate the transmission gear three 311, the transmission gear three 311 rotates to rotate the four transmission gears two 39, the transmission gear two 39 rotates to rotate the corresponding rotating cylinder two 37 to provide power for the rotation of the rotating cylinder two 37, which is convenient for use.

[0036] The bearing ring fixing unit 3 also includes a cross clamping groove 313 and a cross clamping block 314. A cross clamping groove 313 is respectively opened on the upper side surface of each rotating cylinder 1 35, and a cross clamping block 314 is respectively fixedly connected to the lower side surface of each rotating cylinder 2 37. All cross clamping blocks 314 are respectively fixedly clamped with the corresponding cross clamping grooves 313, and all rotating cylinders 2 37 are respectively fixedly clamped with rotating cylinder 1 35 through the cross clamping blocks 314.

[0037] The cross clamping groove 313 and the cross clamping block 314 are clamped to allow the rotating cylinder 2 37 to be clamped with the corresponding rotating cylinder 1 35 to facilitate the rotation of the rotating cylinder 1 35 and facilitate the taking and placing of materials.

[0038] The grinding unit 4 includes a lower section grinding plate 41 and an upper end surface grinding plate 42. The upper side surface of the fixed disc 31 is located between the four clamping plates and is fixedly connected to a lower section grinding plate 41 respectively. The four lower section grinding plates 41 are arranged in a ring. The lower side surface of the fixed top plate 33 is located at the positions corresponding to the four lower section grinding plates 41 and is fixedly connected to an upper end surface grinding plate 42 respectively.

[0039] The lower section grinding plate 41 contacts the lower surface of the bearing ring, and the upper end surface grinding plate 42 is used to contact the upper surface of the bearing ring to grind the upper and lower sides of the bearing ring. By rotating the bearing ring, the outer side of the bearing ring is ground at the same time, thereby achieving composite grinding to improve grinding efficiency.

[0040] The grinding unit 4 also includes a fixed support frame 43, a hydraulic cylinder 44 and an arc-shaped grinding plate 45. The upper surface of the fixed disc 31 and the upper surface of the fixed base plate 1 are respectively fixedly connected to a fixed support frame 43, and each fixed support frame 43 is respectively fixedly clamped with a hydraulic cylinder 44. The corresponding sides of the two hydraulic cylinders 44 are respectively fixedly connected to an arc-shaped grinding plate 45, and the two arc-shaped grinding plates 45 correspond to one of the lower section grinding plates 41 respectively.

[0041] The fixed support frame 43 is used to fix the hydraulic cylinder 44, and the hydraulic cylinder 44 is used to adjust the position of the arc-shaped grinding plate 45. The arc-shaped grinding plate 45 is used to contact the inner and outer surfaces of the bearing ring, so as to grind the inner and outer sides of the bearing ring.

[0042] The working principle of a bearing ring composite grinding device provided by the utility model is as follows: first, a fixed disc 31 is used to fix the workpiece, an electric push rod 32 is used to drive the fixed top plate 33 to move, the fixed top plate 33 is used to drive the rotating cylinder 2 37 to move, the rotating motor 310 is started to rotate the fixed cylinder 312, the fixed cylinder 312 rotates to rotate the transmission gear 311, the transmission gear 311 rotates to rotate the four transmission gears 2 39, the transmission gear 2 39 rotates to rotate the corresponding rotating cylinder 2 37 to provide power for the rotation of the rotating cylinder 2 37, the transmission gear 1 38 is used to rotate the rotating cylinder 2 37 of the outer ring, so as to rotate all the rotating cylinders 2 37, so as to facilitate the rotation of all the rotating cylinders 2 37, so that the rotating cylinder 2 37 is engaged with the rotating cylinder 2 37, and the fixed top plate 33 is used to fix the rotating cylinder The second 37, the rotating seat 34 is used to rotate the rotating cylinder 1 35, and the rotating cylinder 1 35 is used to fix the rotating cylinder 1 35. The rotating cylinder 1 35 is used to contact the bearing ring to facilitate the rotation of the bearing ring for grinding. The cross-clamping groove 313 and the cross-clamping block 314 are clamped to allow the rotating cylinder 2 37 to clamp with the corresponding rotating cylinder 1 35 to fix the bearing ring. At the same time, the lower section grinding plate 41 contacts the lower side surface of the bearing ring, and the upper end surface grinding plate 42 contacts the upper side surface of the bearing ring to grind the upper and lower sides of the bearing ring. By rotating the bearing ring, the outer side of the bearing ring is ground at the same time. The fixed support frame 43 is used to fix the hydraulic cylinder 44. The hydraulic cylinder 44 is used to adjust the position of the arc grinding plate 45. The arc grinding plate 45 is used to contact the inner and outer surfaces of the bearing ring for grinding.

[0043] It is worth noting that the core chip of the external control switch group disclosed in the above embodiment is a PLC microcontroller, the rotating motor 310 adopts a servo motor, and the external control switch group controls the rotating motor 310 and the electric push rod 32 using methods commonly used in the prior art.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A bearing ring composite grinding device, characterized in that: It comprises a fixed base plate (1), a bearing ring fixing unit (3), and a grinding unit (4); Fixed bottom plate (1): the four corners of the lower surface are respectively fixedly connected to a support leg (2), and the four corners of the fixed bottom plate (1) are respectively provided with circular chamfers; The bearing ring fixing unit (3) comprises a fixed disc (31), an electric push rod (32), a fixed top plate (33), a rotating seat (34), a rotating cylinder (35) and a rotating roller (36); the upper surface of the fixed bottom plate (1) is fixedly connected to a fixed disc (31); a grinding unit (4) is arranged on the fixed disc (31); the upper surface of the fixed disc (31) is fixedly connected to four annular array clamping plates; the upper surface of each clamping plate is respectively fixedly connected to two rotating seats with equal spacing. (34), each rotating seat (34) is rotatably connected to a rotating cylinder (35), each rotating cylinder (35) is fixedly sleeved with a rotating roller (36), the upper surface of the fixed bottom plate (1) is located on the left and right sides of the fixed disk (31) and is fixedly connected to an electric push rod (32), the upper ends of the two electric push rods (32) are fixedly connected to a fixed top plate (33), and the input end of the electric push rod (32) is electrically connected to the output end of an external power supply through an external control switch group.

2. A bearing ring composite grinding device according to claim 1, characterized in that: The bearing ring fixing unit (3) further comprises a rotating cylinder 2 (37) and a transmission gear 1 (38); positions on the fixed top plate (33) corresponding to each rotating cylinder 1 (35) are rotatably connected to the rotating cylinder 2 (37) via bearings; each rotating cylinder 2 (37) respectively penetrates the upper and lower sides of the fixed top plate (33); positions on each rotating cylinder 2 (37) located on the upper side of the fixed top plate (33) are respectively fixedly sleeved with a transmission gear 1 (38); and two transmission gears 1 (38) corresponding to the clamping plate among all the transmission gears 1 (38) are meshed and connected with each other.

3. A bearing ring composite grinding device according to claim 2, characterized in that: The bearing ring fixing unit (3) further comprises a transmission gear 2 (39), a rotating motor (310), a transmission gear 3 (311) and a fixed cylinder (312); the upper surface of the fixed top plate (33) is fixedly connected to a rotating motor (310) at a position between all the rotating cylinders 2 (37); the output shaft on the rotating motor (310) is fixedly connected to the fixed cylinder (312); a transmission gear 3 (311) is fixedly sleeved on the fixed cylinder (312); the four rotating cylinders 2 (37) located on the inner ring are respectively fixedly sleeved with transmission gears 2 (39); the four transmission gears 2 (39) are respectively arranged at positions above the transmission gear 1 (38); the transmission gear 3 (311) is meshedly connected with the four transmission gears 2 (39); the input end of the rotating motor (310) is electrically connected to the output end of an external power supply through an external control switch group.

4. A bearing ring composite grinding device according to claim 2, characterized in that: The bearing ring fixing unit (3) further comprises a cross clamping groove (313) and a cross clamping block (314); the upper surface of each rotating cylinder one (35) is provided with a cross clamping groove (313); the lower surface of each rotating cylinder two (37) is fixedly connected to a cross clamping block (314); all the cross clamping blocks (314) are fixedly clamped with the corresponding cross clamping groove (313); and all the rotating cylinders two (37) are fixedly clamped with the rotating cylinder one (35) via the cross clamping blocks (314).

5. The bearing ring composite grinding device according to claim 1, characterized in that: The grinding unit (4) comprises a lower section grinding plate (41) and an upper end surface grinding plate (42); the upper side surface of the fixed disc (31) is located between four clamping plates and is respectively fixedly connected to a lower section grinding plate (41); the four lower section grinding plates (41) are arranged in a ring; the lower side surface of the fixed top plate (33) is located at positions corresponding to the four lower section grinding plates (41) and is respectively fixedly connected to an upper end surface grinding plate (42).

6. A bearing ring composite grinding device according to claim 5, characterized in that: The grinding unit (4) further comprises a fixed support frame (43), a hydraulic cylinder (44) and an arc-shaped grinding plate (45); the upper surface of the fixed disc (31) and the upper surface of the fixed bottom plate (1) are respectively fixedly connected to a fixed support frame (43); a hydraulic cylinder (44) is respectively fixedly clamped on each fixed support frame (43); one side corresponding to the two hydraulic cylinders (44) is respectively fixedly connected to an arc-shaped grinding plate (45); and the two arc-shaped grinding plates (45) respectively correspond to one of the lower section grinding plates (41).

Images