Cloth nest swing suspension piece polishing equipment provided with polishing limiting mechanism

Abstract

The invention relates to the technical field of grinding, in particular to cloth nest swing suspension part grinding equipment provided with a polishing limiting mechanism. A pushing block is fixed to the surface of the moving plate, a moving frame is arranged in the first open groove, a second open groove is formed in the moving frame, a first clamping ring and a second clamping ring are arranged in the second open groove, and a circular ring is placed between the second clamping ring and the first clamping ring; the clamping plate is arranged in the second open groove; the device has the beneficial effects that a second screw rod is screwed, the second screw rod is screwed out of the surface of the base, a moving frame is pushed through a pushing ring, so that the moving frame moves in a first open groove, a limiting plate on the surface of the moving frame moves in a sliding groove, the moving frame moves to one side of a fixed seat, the second screw rod is screwed into a screwing hole, and the position of the moving frame is stabilized; the motor drives the rotating shaft to rotate, and the rotating shaft is located in the circular ring.

Description

Technical Field

[0001] The invention relates to the technical field of polishing, in particular to a cloth bird nest swing suspension part polishing device equipped with a polishing limit mechanism. Background Art

[0002] A swing is a kind of recreational and sports equipment. Two ropes or chains of equal length are hung on a U-shaped high frame or tree trunk, and the bottom edges are tied horizontally to the two ends of a flat wooden board. People can stand or sit on the board, hold the ropes or chains with both hands, and swing back and forth using their body strength.

[0003] In the prior art, the top of the fabric bird nest swing is suspended by a ring. When the fabric bird nest swing swings, the ring can reduce the friction, so that the fabric bird nest swing can swing easily. When the ring is produced, it is cast through a mold;

[0004] However, there are burrs inside the cast ring, which will affect the swing of the bird nest swing. The burrs inside the ring need to be polished. The existing polishing equipment needs to fix the ring, and then polish the burrs inside the ring through the polishing equipment. The burrs need to be polished one by one, resulting in low polishing efficiency. Summary of the invention

[0005] The object of the present invention is to provide a cloth bird's nest swing suspension parts grinding device equipped with a polishing limit mechanism to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a polishing device for a cloth bird nest swing suspension part equipped with a polishing limit mechanism, comprising:

[0007] A base, wherein a first slot is formed inside the base;

[0008] A movable plate, a push block is fixed on the surface of the movable plate, a movable frame is arranged in the first slot, a second slot is arranged inside the movable frame, a first clamping ring and a second clamping ring are arranged in the second slot, and a circular ring is placed between the second clamping ring and the first clamping ring; and

[0009] The clamping plate is arranged in the second slot.

[0010] Preferably, a connecting rod is fixed to the surface of the base, a fixing seat is fixed to the end of the connecting rod, a motor is fixed to the surface of the fixing seat, the motor is connected to the rotating shaft, the motor can drive the rotating shaft to rotate, a grinding brush is arranged on the surface of the rotating shaft, and multiple groups of grinding brushes are arranged, the grinding brushes rotate with the rotating shaft, the grinding brushes are elastic, the grinding brushes can be bent, and a slide groove is fixed to the surface of the connecting rod, and the slide groove is located on the side where the connecting rods are close to each other.

[0011] Preferably, a limit plate is fixed on the surface of the movable frame, the limit plate is located on both sides of the movable frame, the limit plate is inserted into the groove inside the first slot, the groove inside the first slot is communicated with the slide slot, the limit plate can be moved into the slide slot, and the limit plate can move in the slide slot, the movable frame moves with the limit plate, and the movable frame can move to a position between the two sets of connecting rods.

[0012] Preferably, a through groove is provided at the bottom of the base, and a reinforcing rod is fixed inside the through groove, and multiple groups of reinforcing rods are fixed therein. The reinforcing rods are located at the bottom of the base, and a blanking trough is provided at the bottom of the movable frame, and multiple groups of blanking troughs are provided.

[0013] Preferably, a screw hole is provided on the surface of the base, a clamping plate is inserted in the second slot, multiple groups of clamping plates are provided, the clamping plates can be inserted into the interior of the mobile frame and extend from the interior of the mobile frame, the end of the clamping plate is connected to a spring, the spring is located inside the mobile frame, and the spring inside the mobile frame has a thrust on the clamping plate, so that the clamping plate extends out of the mobile frame, and a force groove is provided on the surface of the clamping plate, and the mobile plate is inserted in the force groove.

[0014] Preferably, the movable plate can move in the force groove, and a plurality of groups of pushing blocks are fixed at the bottom of the movable plate. The pushing blocks move with the movable plate. When the pushing blocks move into the force groove, the pushing blocks exert downward pressure on the force groove, so that the clamping plate is pressed down into the interior of the movable frame. A U-shaped rod is fixed at the end of the movable plate, and the other end of the U-shaped rod is inserted into the interior of the movable frame. The U-shaped rod can move inside the movable frame.

[0015] Preferably, a docking rod is fixed to the end of the movable plate, a sleeve ring is fixed to the end of the docking rod, a through groove is opened at the bottom of the movable frame, a first screw is threaded in the through groove, the first screw is located inside the sleeve ring, two sets of limit rings are arranged on the surface of the first screw, the limit rings are respectively located on both sides of the sleeve ring, and the sleeve ring moves with the first screw.

[0016] Preferably, support rods are fixed to the surface of the movable plate, and two groups of support rods are provided. The two groups of support rods are respectively connected to the two groups of movable plates, and a first clamping ring is fixed to the other end of the support rod. The first clamping ring moves with the movable plate through the support rod, and a cross bar is fixed in the second slot, and a second clamping ring is fixed to the end of the cross bar, and the size of the second clamping ring is consistent with the size of the first clamping ring.

[0017] Preferably, a circular ring is placed between the first clamping ring and the second clamping ring, and the first clamping ring moves along with the movable plate, and the circular ring is clamped by the first clamping ring and the second clamping ring.

[0018] Preferably, a pushing ring is fixed on the top of the movable frame, and the movable frame moves with the pushing ring. A limiting rod is fixed on the surface of the pushing ring, and a fixing plate is fixed on the end of the limiting rod. A second screw is screwed on the surface of the fixing plate, and the second screw is screwed on the surface of the base to fix the pushing ring on one side of the base. The second screw can be screwed in the screw hole to stabilize the pushing ring on the other side of the base. The rotating shaft is inserted into the interior of the first clamping ring, the circular ring and the second clamping ring. The inner diameters of the first clamping ring and the second clamping ring are larger than the inner ring diameter of the circular ring. The surface of the grinding brush contacts the inner ring of the circular ring, and the grinding brush grinds the inner ring of the circular ring as the rotating shaft rotates.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention proposes to screw the second screw rod, screw the second screw rod out from the surface of the base, push the movable frame through the pushing ring, so that the movable frame moves in the first slot, the limit plate on the surface of the movable frame moves in the slide slot, the movable frame moves to one side of the fixed seat, and the second screw rod is screwed into the screw hole to stabilize the position of the movable frame, and the rotating shaft is driven by a motor to rotate, at this time the rotating shaft is located inside the circular ring, the grinding brush on the surface of the rotating shaft is located inside the circular ring, and the grinding brush grinds the inside of the circular ring as the rotating shaft rotates, thereby realizing simultaneous grinding of multiple groups of circular rings and improving the efficiency of grinding the circular rings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 This is a structural schematic diagram of another viewing angle of the present invention.

[0023] Figure 3 It is a schematic diagram of the rotating shaft structure of the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of the mobile rack of the present invention.

[0025] Figure 5 This is a structural schematic diagram of the mobile frame of the present invention from another viewing angle.

[0026] Figure 6 It is a schematic diagram of the bottom structure of the base of the present invention.

[0027] Figure 7 It is a schematic diagram of the cross-sectional structure of the base of the present invention.

[0028] Figure 8 It is a schematic diagram of a partially enlarged structure of the base cross section of the present invention.

[0029] Fig. 9 for Figure 7 A schematic diagram of the enlarged structure in the middle.

[0030] In the figure: base 1, first slot 2, connecting rod 3, fixed seat 4, motor 5, grinding brush 6, rotating shaft 7, slide groove 8, second slot 9, movable frame 10, limit plate 11, through slot 12, reinforcing rod 13, blanking groove 14, screw hole 16, first clamping ring 17, support rod 18, U-shaped rod 19, docking rod 20, first screw 21, sleeve ring 22, movable plate 23, push block 24, clamping plate 25, force groove 26, cross bar 27, circular ring 29, pushing ring 30, limit rod 31, second screw 32, fixed plate 33, through slot 34, second clamping ring 35. DETAILED DESCRIPTION

[0031] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figures 1 to 9 , the present invention provides a technical solution:

[0033] Embodiment 1: A cloth bird's nest swing hanging part grinding equipment equipped with a polishing limit mechanism comprises: a base 1, a first slot 2 is provided inside the base 1; a movable plate 23, a push block 24 is fixed on the surface of the movable plate 23, a movable frame 10 is provided in the first slot 2, a second slot 9 is provided inside the movable frame 10, a first clamping ring 17 and a second clamping ring 35 are provided in the second slot 9, a circular ring 29 is placed between the second clamping ring 35 and the first clamping ring 17; and a clamping plate 25, which is provided in the second slot 9, U-shaped rods 19 are provided at both ends of the movable plate 23, the other end of the U-shaped rod 19 is inserted into the inside of the movable frame 10, which plays a limiting role, and after the movable plate 23 moves, the push block 24 on the surface of the movable plate 23 is supported in the force groove 26 on the surface of the clamping plate 25, so that the clamping plate 25 is subjected to downward pressure and inserted into the inside of the movable frame 10.

[0034] Embodiment 2: On the basis of embodiment 1, a connecting rod 3 is fixed to the surface of the base 1, a fixing seat 4 is fixed to the end of the connecting rod 3, a motor 5 is fixed to the surface of the fixing seat 4, the motor 5 is connected to the rotating shaft 7, the motor 5 can drive the rotating shaft 7 to rotate, a grinding brush 6 is arranged on the surface of the rotating shaft 7, the grinding brush 6 is arranged in multiple groups, the grinding brush 6 rotates with the rotating shaft 7, the grinding brush 6 has elasticity, the grinding brush 6 can be bent, and a slide groove 8 is fixed to the surface of the connecting rod 3, the slide groove 8 is located on the side where the connecting rods 3 are close to each other, a screw hole 16 is provided on the surface of the base 1, a clamping plate 25 is inserted in the second slot 9, the clamping plate 25 is arranged in multiple groups, the clamping plate 25 can be inserted into the interior of the moving frame 10 and extend out from the interior of the moving frame 10, a spring is connected to the end of the clamping plate 25, the spring is located inside the moving frame 10, and the spring inside the moving frame 10 has a thrust on the clamping plate 25, so that the clamping plate 25 The outer surface of the clamping plate 25 is extended outward from the moving frame 10, and a force groove 26 is opened on the surface of the clamping plate 25. The moving plate 23 is inserted in the force groove 26, and the moving plate 23 can move in the force groove 26. A plurality of groups of pushing blocks 24 are fixed at the bottom of the moving plate 23. The pushing blocks 24 move with the moving plate 23. When the pushing blocks 24 move into the force groove 26, the pushing blocks 24 exert downward pressure on the force groove 26, so that the clamping plate 25 is pressed down into the interior of the moving frame 10. A U-shaped rod 19 is fixed at the end of the moving plate 23, and the other end of the U-shaped rod 19 is inserted into the interior of the moving frame 10. The U-shaped rod 19 can move inside the moving frame 10. The pushing blocks 24 on the surface of the moving plate 23 are held in the force groove 26 on the surface of the clamping plate 25, so that the clamping plate 25 is subjected to downward pressure and inserted into the interior of the moving frame 10. A spring is connected to one side of the clamping plate 25 located inside the moving frame 10, so that the spring inside the moving frame 10 is compressed.

[0035] A docking rod 20 is fixed to the end of the mobile plate 23, and a sleeve ring 22 is fixed to the end of the docking rod 20. A through groove 34 is opened at the bottom of the mobile frame 10, and a first screw rod 21 is screwed in the through groove 34. The first screw rod 21 is located inside the sleeve ring 22. Two groups of limit rings are arranged on the surface of the first screw rod 21. The limit rings are respectively located on both sides of the sleeve ring 22. The sleeve ring 22 moves with the first screw rod 21. A support rod 18 is fixed to the surface of the mobile plate 23. The support rod 18 is provided with two groups. The two groups of support rods 18 are respectively connected to the two groups of mobile plates 23. The other end of the support rod 18 is fixed with a first clamping ring 17. The first clamping ring 17 is supported by a support rod 18. The support rod 18 moves with the movable plate 23, and a cross bar 27 is fixed in the second slot 9. A second clamping ring 35 is fixed at the end of the cross bar 27. The size of the second clamping ring 35 is consistent with the size of the first clamping ring 17. A circular ring 29 is placed between the first clamping ring 17 and the second clamping ring 35. The first clamping ring 17 moves with the movable plate 23, and the circular ring 29 is clamped by the first clamping ring 17 and the second clamping ring 35. The motor 5 drives the rotating shaft 7 to rotate. At this time, the rotating shaft 7 is located inside the circular ring 29, and the grinding brush 6 on the surface of the rotating shaft 7 is located inside the circular ring 29. The grinding brush 6 grinds the inside of the circular ring 29 as the rotating shaft 7 rotates.

[0036] A limit plate 11 is fixed on the surface of the mobile frame 10, and the limit plate 11 is located on both sides of the mobile frame 10. The limit plate 11 is inserted into the groove inside the first slot 2, and the groove inside the first slot 2 is communicated with the slide slot 8. The limit plate 11 can move into the slide slot 8, and the limit plate 11 can move in the slide slot 8. The mobile frame 10 moves with the limit plate 11, and the mobile frame 10 can move to the position between the two sets of connecting rods 3. A pushing ring 30 is fixed on the top of the mobile frame 10, and the mobile frame 10 moves with the pushing ring 30. A limit rod 31 is fixed on the surface of the pushing ring 30, and a fixing plate 33 is fixed on the end of the limit rod 31. The surface of the fixing plate 33 is screwed with a second screw 32, the second screw 32 is screwed on the surface of the base 1 to fix the push ring 30 on one side of the base 1, and the second screw 32 can be screwed in the screw hole 16 to stabilize the push ring 30 on the other side of the base 1, and the rotating shaft 7 is inserted into the first clamping ring 17, the circular ring 29 and the second clamping ring 35. The inner diameters of the first clamping ring 17 and the second clamping ring 35 are larger than the inner ring diameter of the circular ring 29, and the surface of the grinding brush 6 contacts the inner ring of the circular ring 29, and the grinding brush 6 grinds the inner ring of the circular ring 29 as the rotating shaft 7 rotates, and the grinding brush 6 grinds the inside of the circular ring 29 as the rotating shaft 7 rotates, thereby realizing simultaneous grinding of multiple groups of circular rings 29 and improving the efficiency of grinding the circular rings 29. A through slot 12 is provided at the bottom of the base 1, and a reinforcing rod 13 is fixed inside the through slot 12. There are multiple groups of reinforcing rods 13 fixed therein. The reinforcing rods 13 are located at the bottom of the base 1. A material drop trough 14 is provided at the bottom of the movable frame 10. There are multiple groups of material drop troughs 14.

[0037] The ring 29 is inserted between the two groups of clamping plates 25, and the ring 29 is clamped by the clamping plate 25. Multiple groups of rings 29 can be clamped in the second slot 9. The first screw rod 21 is screwed, and the limiting ring on the surface of the first screw rod 21 supports the sleeve ring 22, so that the sleeve ring 22 drives the movable plate 23 to move through the docking rod 20. Both ends of the movable plate 23 are provided with U-shaped rods 19, and the other end of the U-shaped rod 19 is inserted into the interior of the movable frame 10 to play a limiting role. After the movable plate 23 moves, the pushing block 24 on the surface of the movable plate 23 is supported in the force groove 26 on the surface of the clamping plate 25, so that the clamping plate 25 is inserted into the interior of the movable frame 10 under the downward pressure. The clamping plate 25 is located on one side of the movable frame 10. The spring is connected to the spring inside the movable frame 10, so that the spring inside the movable frame 10 is compressed, and the surface of the movable plate 23 moves with the movable plate 23 through the first clamping ring 17 connected to the support rod 18. The second slot 9 The second clamping ring 35 is connected and fixed to the interior of the frame by a cross bar 27, and the circular ring 29 is clamped and fixed by the first clamping ring 17 and the second clamping ring 35, and the clamping plate 25 will not block the two sides of the circular ring 29 after it is lowered, and the second screw rod 32 is screwed out from the surface of the base 1, and the movable frame 10 is pushed by the pushing ring 30, so that the movable frame 10 moves in the first slot 2, and the limit plate 11 on the surface of the movable frame 10 moves in the slide groove 8, and the movable frame 10 moves to one side of the fixed seat 4, and the second screw rod 32 is screwed into the screw hole 16, so that the position of the movable frame 10 is stabilized, and the rotating shaft 7 is driven by the motor 5 to rotate. At this time, the rotating shaft 7 is located inside the circular ring 29, and the grinding brush 6 on the surface of the rotating shaft 7 is located inside the circular ring 29. The grinding brush 6 grinds the inside of the circular ring 29 as the rotating shaft 7 rotates, so that multiple groups of circular rings 29 can be polished at the same time, thereby accelerating the efficiency of polishing the circular ring 29.

[0038] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A polishing equipment for cloth bird nest swing suspension parts equipped with a polishing limit mechanism, characterized in that: include: A base (1), wherein a first slot (2) is formed inside the base (1); A movable plate (23), a push block (24) is fixed on the surface of the movable plate (23), a movable frame (10) is arranged in the first slot (2), a second slot (9) is arranged inside the movable frame (10), a first clamping ring (17) and a second clamping ring (35) are arranged in the second slot (9), and a circular ring (29) is placed between the second clamping ring (35) and the first clamping ring (17); and The clamping plate (25) is arranged in the second slot (9).

2. The cloth bird nest swing hanging parts polishing device equipped with a polishing limit mechanism according to claim 1 is characterized in that: A connecting rod (3) is fixed on the surface of the base (1), a fixing seat (4) is fixed at the end of the connecting rod (3), a motor (5) is fixed on the surface of the fixing seat (4), the motor (5) is connected to a rotating shaft (7), the motor (5) can drive the rotating shaft (7) to rotate, a grinding brush (6) is arranged on the surface of the rotating shaft (7), a plurality of groups of grinding brushes (6) are arranged, the grinding brush (6) rotates with the rotating shaft (7), the grinding brush (6) is elastic, and the grinding brush (6) can be bent, and a slide groove (8) is fixed on the surface of the connecting rod (3), and the slide groove (8) is located on the side of the connecting rod (3) close to each other.

3. The cloth bird nest swing hanging parts polishing equipment equipped with a polishing limit mechanism according to claim 2 is characterized in that: A limiting plate (11) is fixed on the surface of the movable frame (10), the limiting plate (11) is located on both sides of the movable frame (10), the limiting plate (11) is inserted into the groove inside the first slot (2), the groove inside the first slot (2) is connected to the slide slot (8), the limiting plate (11) can move into the slide slot (8), and the limiting plate (11) can move in the slide slot (8), the movable frame (10) moves along with the limiting plate (11), and the movable frame (10) can move to a position between the two sets of connecting rods (3).

4. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 3 is characterized in that: The bottom of the base (1) is provided with a through slot (12), a reinforcing rod (13) is fixed inside the through slot (12), a plurality of reinforcing rods (13) are fixed, and the reinforcing rods (13) are located at the bottom of the base (1). The bottom of the movable frame (10) is provided with a material drop groove (14), and a plurality of material drop grooves (14) are provided.

5. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 4 is characterized in that: The surface of the base (1) is provided with a screw hole (16), a clamping plate (25) is inserted into the second slot (9), a plurality of clamping plates (25) are provided, the clamping plates (25) can be inserted into the interior of the mobile frame (10), and extend out from the interior of the mobile frame (10), the end of the clamping plate (25) is connected with a spring, the spring is located inside the mobile frame (10), and the spring inside the mobile frame (10) has a thrust on the clamping plate (25), so that the clamping plate (25) extends out of the mobile frame (10), and a force groove (26) is provided on the surface of the clamping plate (25), and the mobile plate (23) is inserted into the force groove (26).

6. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 5, characterized in that: The movable plate (23) can move in the stress groove (26). A plurality of push blocks (24) are fixed at the bottom of the movable plate (23). The push blocks (24) move along with the movable plate (23). When the push blocks (24) move into the stress groove (26), the push blocks (24) exert downward pressure on the stress groove (26), so that the clamping plate (25) is pressed downward into the interior of the movable frame (10). A U-shaped rod (19) is fixed at the end of the movable plate (23). The other end of the U-shaped rod (19) is inserted into the interior of the movable frame (10). The U-shaped rod (19) can move inside the movable frame (10).

7. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 6, characterized in that: A docking rod (20) is fixed at the end of the movable plate (23), a sleeve ring (22) is fixed at the end of the docking rod (20), a through groove (34) is provided at the bottom of the movable frame (10), a first screw rod (21) is screwed in the through groove (34), the first screw rod (21) is located inside the sleeve ring (22), two groups of limiting rings are provided on the surface of the first screw rod (21), the limiting rings are respectively located on both sides of the sleeve ring (22), and the sleeve ring (22) moves along with the first screw rod (21).

8. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 7, characterized in that: A support rod (18) is fixed on the surface of the movable plate (23), and two groups of support rods (18) are provided. The two groups of support rods (18) are respectively connected to the two groups of movable plates (23). A first clamping ring (17) is fixed to the other end of the support rod (18), and the first clamping ring (17) moves along with the movable plate (23) through the support rod (18). A cross bar (27) is fixed in the second slot (9), and a second clamping ring (35) is fixed at the end of the cross bar (27), and the size of the second clamping ring (35) is consistent with the size of the first clamping ring (17).

9. The grinding device for fabric bird nest swing suspension parts equipped with a polishing limit mechanism according to claim 8, characterized in that: A circular ring (29) is placed between the first clamping ring (17) and the second clamping ring (35); the first clamping ring (17) moves along with the movable plate (23), and the circular ring (29) is clamped by the first clamping ring (17) and the second clamping ring (35).

10. The cloth bird nest swing hanging part polishing device equipped with a polishing limit mechanism according to claim 9, characterized in that: A pushing ring (30) is fixed on the top of the moving frame (10), and the moving frame (10) moves along with the pushing ring (30). A limiting rod (31) is fixed on the surface of the pushing ring (30), and a fixing plate (33) is fixed on the end of the limiting rod (31). A second screw rod (32) is screwed on the surface of the fixing plate (33), and the second screw rod (32) is screwed on the surface of the base (1) to fix the pushing ring (30) on one side of the base (1). The second screw rod (32) can be screwed The push ring (30) is connected to the screw hole (16), and the push ring (30) is stabilized on the other side of the base (1). The rotating shaft (7) is inserted into the first clamping ring (17), the circular ring (29) and the second clamping ring (35). The inner diameters of the first clamping ring (17) and the second clamping ring (35) are larger than the inner ring diameter of the circular ring (29). The surface of the grinding brush (6) contacts the inner ring of the circular ring (29). The grinding brush (6) grinds the inner ring of the circular ring (29) as the rotating shaft (7) rotates.

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