A processing method of an electric vehicle wheel hub

Abstract

This invention provides a method for processing electric vehicle wheel hubs, comprising the following production steps: preparation of wheel hub raw materials, smelting, finishing, blanking, first stamping, second stamping, third stamping, fourth stamping, drilling, assembly, and warehousing; the inner liner is processed by a punch press, thereby reducing casting and finishing processes, shortening the production cycle, and increasing production speed; the loading and unloading are replaced by a loading assembly and a material changing assembly, thereby reducing labor costs, reducing loading and unloading installation time, and further increasing production speed.

Description

Technical Field

[0001] This invention relates to wheel hub manufacturing processes, and more particularly, to a method for processing electric vehicle wheel hubs. Background Technology

[0002] Currently, Chinese patent CN107457531A discloses a motorcycle wheel hub manufacturing process, including smelting and composition analysis, casting, cutting and drilling, deburring, heat treatment, straightening, shot blasting, drilling valve holes, hardness testing, machining, spline drawing, impact testing, air tightness testing, cleaning, spraying, topcoat painting, press fitting, assembly, and packaging. This processing technology improves and adjusts the processing steps, and enhances the product's appearance quality through process improvement.

[0003] The spokes of the aforementioned wheel hub are integrally cast with the hub using a mold. The cost of manufacturing this mold is relatively high. Furthermore, when manufacturing wheel hubs for different purposes, if the mechanical properties or appearance of the wheel hub need to be adjusted, it is generally impossible to modify the number or strength of the spokes when using the original mold. It is necessary to re-open the mold, which is also costly. The existing solution is to disassemble the wheel hub into multiple parts and then assemble them for production.

[0004] like Figure 1 As shown, an electric vehicle wheel hub includes an inner liner, an outer hub shell, and an end cap. The outer hub shell is fixed to the inner liner by screws, and the end cap is fixed to the inner liner by screws. The electric vehicle wheel hub is usually manufactured separately and then assembled during the processing. However, due to the large number of parts, multiple molds are required to complete the production of the blanks during casting, resulting in high mold costs. At the same time, all parts need to be precision machined, leading to a long production cycle and slow production speed. Summary of the Invention

[0005] In view of this, the present invention provides a method for processing electric vehicle wheel hubs, which uses stamping to achieve rapid production.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for processing electric vehicle wheel hubs, comprising the following production steps:

[0007] S1: Preparation of wheel hub raw materials, including aluminum, copper, magnesium, titanium and zirconium, and cleaning and cutting.

[0008] S2: Melting, casting the outer hub shell and end caps using molds;

[0009] S3: Finishing, performing finishing and post-processing on the outer hub shell and end cap;

[0010] S4: Blanking, using laser cutting to cut out circular plates of the required size;

[0011] S5: First stamping: The circular plate is placed on the first stamping press by the feeding assembly to form the prototype of the inner liner.

[0012] S6: Second stamping: The inner liner after the first stamping is placed on the second stamping press through the material changing component to form a flange;

[0013] S7: Third stamping; The inner liner, after the second stamping, is placed on the third stamping press through the material changing assembly for a third stamping to shape the inner liner.

[0014] S8: Fourth stamping; The inner liner, which has been stamped three times, is placed on the fourth stamping press through the material changing assembly for the fourth stamping to cut out the center hole of the inner liner.

[0015] S9: Drilling, using a drilling machine to create annular connecting holes on the inner liner and outer hub shell.

[0016] S10: Assembly: Secure the inner liner, outer hub shell, and end cap with screws.

[0017] S11: Warehousing;

[0018] The feeding assembly in the above production step S5 includes an XZ axis moving assembly one and a first conveyor belt. The material changing assembly includes an XZ axis moving assembly two and a second conveyor belt. The output end of the XZ axis moving assembly one is equipped with a suction cup one and a suction cup two. The suction cup one is used to place the circular plate on the first conveyor belt onto the first punch press. The suction cup two is used to place the inner liner on the first punch press onto the second conveyor belt. Material changing assemblies are provided between the first punch press and the second punch press, between the second punch press and the third punch press, and between the third punch press and the fourth punch press.

[0019] By employing the aforementioned technical means, the inner liner is processed using a punch press, thereby reducing casting and finishing processes, shortening the production cycle, and increasing production speed. The loading and unloading components replace manual loading and unloading, thereby reducing labor costs, loading and unloading installation time, and further increasing production speed.

[0020] Preferably, the drilling machine in S9 includes a Z-axis drive assembly, a machining assembly, and a mounting assembly. The machining assembly is located at the output end of the Z-axis drive assembly and is used to drive the machining assembly to move up and down. The mounting assembly is used to fix the outer hub shell, and a reinforcing plate is also provided at the bottom of the machining assembly.

[0021] By using the above-mentioned technical means, and by setting a reinforcing plate at the bottom of the processing component, the structural rigidity of the component is increased, and the processing accuracy is improved.

[0022] Preferably, the Z-axis drive assembly includes a linear guide rail and a drive source one, the machining assembly is disposed at the output end of the drive source one, the reinforcing plate is slidably disposed on the linear guide rail, and the drive source one drives the machining assembly and the reinforcing plate to move along the Z-axis direction.

[0023] By employing the aforementioned technical means and through the sliding fit between the linear guide and the reinforcing plate, the linear accuracy of the machining components and the rigidity of the reinforcing plate are increased, thereby further ensuring drilling accuracy.

[0024] Preferably, the processing component includes several main units, each with a drill bit at its output end. The main units drive the drill bit to rotate. The main units are arranged in a circular array at the output end of the Z-axis drive component. The reinforcing plate also has several through slots through which the bottom of the main units passes.

[0025] By employing the aforementioned technical means, the main unit is arranged in a ring array at the output end of the Z-axis drive component, enabling the drilling machine to process multiple connecting holes at once, thereby increasing drilling efficiency. At the same time, it eliminates the need for angular positioning of the outer hub shell, thus increasing the angular accuracy of the connecting holes.

[0026] Preferably, the processing assembly further includes a housing and an expansion motor. The expansion motor is disposed inside the housing, and an expansion block is provided at the output end of the expansion motor. The expansion motor is threadedly connected to the expansion block. The expansion block has several T-slots, and a tail block is slidably disposed in each of the T-slots. The main unit is fixedly disposed on the tail block. The housing also has guide posts arranged laterally in the same number as the tail blocks. The guide posts are slidably connected to the tail blocks respectively. The through slot is elongated. A clamp for fixing the main unit is also provided on the outside of the main unit.

[0027] By using the above-mentioned technical means, the expansion and contraction blocks move up and down, and the tail block moves laterally along the direction of the guide post through the cooperation between the T-slot and the tail block, thereby controlling the position of the main unit and uniformly changing the diameter between the drill bits, so that the equipment can be used for outer hub shells of various sizes.

[0028] Preferably, a screw is further provided between the Z-axis drive assembly and the mounting assembly. The screw is threadedly connected to the reinforcing plate. A second drive source is also provided at the end of the screw. The chuck includes symmetrically arranged clamping blocks on the outside of the main unit. An inclined surface is provided on the inner side of the clamping block. An inclined guide block is sleeved on the outside of the main unit. An inclined surface is provided on the outer side of the inclined guide block. The inclined surface is slidably engaged with the inclined surface. A slot is also provided on the side end of the clamping block. The slotted side end is inserted into the slot.

[0029] By using the above-mentioned technical means, the drive source two controls the screw to rotate, which in turn controls the reinforcing plate to move up and down. Through the inclined top cooperation between the clamping block and the inclined guide block one, the drive source two controls the reinforcing plate to move and makes the side of the slot press against the inclined guide block one, thereby increasing the rigidity of the main unit while making the main unit position adjustable.

[0030] Preferably, the installation assembly includes a machine base, guide blocks, positioning components, and clamping cylinders. The guide blocks and clamping cylinders are both mounted on the machine base. The positioning components are located at the bottom of the reinforcing plate. The positioning components include several tensioning blocks, limiting rings, and inclined guide blocks. The inclined guide blocks have inclined surfaces three in the same number as the tensioning blocks. The tensioning blocks have inclined surfaces four on their inner sides. The inclined surfaces three and four are in contact. The inclined guide blocks have hanging ring grooves. The limiting rings are slidably mounted in the hanging ring grooves. The limiting rings have T-shaped grooves two in a circular array. T-shaped blocks are fixedly mounted above each tensioning block. The T-shaped blocks are slidably mounted in the T-shaped grooves two.

[0031] Through the above-mentioned technical means, the guide block facilitates the initial positioning of the outer wheel hub shell, the cooperation between the inclined guide block and the tensioning block enables the precise positioning of the outer wheel hub shell, and the clamping cylinder presses the outer wheel hub shell, thereby realizing the positioning and fixing of the outer wheel hub shell, increasing drilling accuracy and drilling stability.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. By processing the inner liner with a punch press, the casting and finishing processes are reduced, the production cycle is shortened, and the production speed is increased. The loading and unloading components replace manual loading and unloading, thereby reducing labor costs, reducing loading and unloading installation time, and further increasing the production speed.

[0034] 2. By moving the expansion and contraction blocks up and down, the tail block moves laterally along the direction of the guide column, thereby controlling the movement of the main unit and uniformly changing the diameter of the drill bit annular array, thus making the equipment suitable for various sizes of outer hub shells;

[0035] 3. The guide block facilitates the initial positioning of the outer wheel hub shell. The cooperation between the inclined guide block and the tensioning block enables precise positioning of the outer wheel hub shell. The clamping cylinder presses the outer wheel hub shell to achieve positioning and fixation. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of an electric vehicle wheel hub;

[0037] Figure 2 This is a schematic diagram of the structure of Embodiment 1;

[0038] Figure 3 This is a schematic diagram of the structure of Example 2;

[0039] Figure 4 This is a cross-sectional schematic diagram of Example 2;

[0040] Figure 5 This is a partial sectional view of the chuck component;

[0041] Figure 6 This is a partial sectional view of the positioning component;

[0042] Figure 7 This is a partial schematic diagram of the positioning component.

[0043] Reference numerals: 1. Housing; 2. Machine base; 3. Z-axis drive assembly; 4. Machining assembly; 5. Mounting assembly; 6. Linear guide rail; 7. Drive source one; 8. Reinforcing plate; 9. Main unit; 10. Drill bit; 11. Slotting; 12. Expanding / shrinking motor; 13. Expanding / shrinking block; 14. T-slot one; 15. Tail block; 16. Guide post; 17. Chuck; 18. Clamping block; 19. Inclined surface one; 20. Vertical surface one; 21. Inclined guide block one; 22. Inclined surface two; 23. Vertical surface two; 24. Slot; 25. Rubber... 26. Glue block; 27. Screw; 28. Drive source two; 29. ​​Guide block; 30. Positioning component; 31. Clamping cylinder; 32. Tensioning block; 33. Limiting ring; 34. Inclined guide block two; 35. Inclined surface four; 36. Hanging ring groove; 37. T-slot two; 38. T-block; 39. XZ axis moving assembly one; 40. First conveyor belt; 41. XZ axis moving assembly two; 42. Second conveyor belt; 43. Suction cup one; 44. Suction cup two; 90. Outer hub shell; 91. Inner liner; 92. End cap. Detailed Implementation

[0044] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and mastered. Example

[0045] A method for processing an electric vehicle wheel hub includes the following production steps:

[0046] S1: Preparation of wheel hub raw materials, including aluminum, copper, magnesium, titanium and zirconium, and cleaning and cutting.

[0047] S2: Melting, casting the outer hub shell 90 and end cap 92 using molds;

[0048] S3: Finishing, performing finishing and post-processing on the outer hub shell 90 and end cap 92;

[0049] S4: Blanking, using laser cutting to cut out circular plates of the required size;

[0050] S5: First stamping: The circular plate is placed on the first stamping press by the feeding assembly to form the prototype of the inner liner 91.

[0051] S6: Second stamping: The inner liner 91, which has been stamped in the first stamping, is placed on the second stamping press through the material changing assembly to form a flange;

[0052] S7: Third stamping; The inner liner 91, which has been stamped twice, is placed on the third stamping press through the material changing assembly for a third stamping, and the inner liner 91 is shaped.

[0053] S8: Fourth stamping; The inner liner 91, which has been stamped three times, is placed on the fourth stamping press through the material changing assembly for the fourth stamping to cut out the center hole of the inner liner 91.

[0054] S9: Drilling, using a drilling machine to create an annular connecting hole on the inner liner 91 and the outer hub shell 90.

[0055] S10: Assembly: Secure the inner liner 91, outer hub shell 90, and end cap 92 with screws.

[0056] S11: Warehousing;

[0057] The feeding assembly in the above production step S5 includes an XZ axis moving assembly 39 and a first conveyor belt 40. The material changing assembly includes an XZ axis moving assembly 41 and a second conveyor belt 42. The output end of the XZ axis moving assembly 39 is provided with a suction cup 43 and a suction cup 44. The suction cup 43 is used to place the circular plate on the first conveyor belt 40 onto the first punch press. The suction cup 44 is used to place the inner liner 91 on the first punch press onto the second conveyor belt 42. Material changing assemblies are provided between the first punch press and the second punch press, between the second punch press and the third punch press, and between the third punch press and the fourth punch press. Example

[0058] The drilling machine in the above production step S9 includes a housing 1, a machine base 2, a Z-axis drive assembly 3, a machining assembly 4, and a mounting assembly 5. The Z-axis drive assembly 3 includes a linear guide rail 6 and a drive source 7. The linear guide rail 6 is fixedly installed between the housing 1 and the machine base 2. The drive source 7 is a linear motor. The Z-axis drive assembly 3 drives the machining assembly 4 to move up and down. The mounting assembly 5 is used to fix the outer hub shell 90. The outer hub shell 90 is annular and has an inner hole on its inner side. The machining assembly 4 is located at the output end of the drive source 7.

[0059] The bottom of the processing component 4 is also provided with a reinforcing plate 8, which is slidably mounted on the linear guide rail 6. The processing component 4 includes six main units 9, each with a drill bit 10 at its output end. The main units 9 drive the drill bit 10 to rotate. The main units 9 are arranged in a ring array at the output end of the Z-axis drive component 3. The reinforcing plate 8 is also provided with several through slots 11, through which the bottom of the main units 9 passes. When the drive source 7 drives the processing component 4 to move up and down, the reinforcing plate 8 moves accordingly and increases the movement accuracy of the processing component 4. At this time, the six main units 9 move simultaneously and process the six connecting holes at the same time. There is no need to perform angular positioning on the outer hub shell 90, which increases the angular accuracy of the connecting holes. The reinforcing plate 8 increases the rigidity of the bottom of the main units 9 while increasing the movement accuracy of the main units 9.

[0060] The processing component 4 also includes an expansion motor 12, which is installed inside the housing 1. An expansion block 13 is installed at the output end of the expansion motor 12. The expansion motor 12 is threadedly connected to the expansion block 13. The expansion block 13 has six T-slots 14, which are inclined. Tail blocks 15 are slidably installed in each T-slot 14. The main unit 9 is fixedly installed on the tail blocks 15. Six guide posts 16 are also horizontally installed on the housing 1. The six guide posts 16 are slidably connected to the six tail blocks 15 respectively. When the expansion motor 12 rotates forward, the expansion block 13 moves upward. At this time, the six tail blocks 15 move outward along the guide posts 16. When the motor rotates in reverse, the tail blocks 15 move inward, thereby changing the diameter of the center line of the array formed by the six main units 9 in a ring array. The through slot 11 on the reinforcing plate 8 is long and narrow. The main unit 9 moves along the through slot 11 when it moves. A chuck 17 is also installed on the outside of the main unit 9. The chuck 17 cooperates with the through slot 11 to fix the main unit 9.

[0061] The chuck 17 includes symmetrically arranged clamping blocks 18 on the outside of the main unit 9. The inner side of each clamping block 18 has an inclined surface 19 and a vertical surface 20. An inclined guide block 21 is fitted onto the outside of the main unit 9. An inclined surface 22 is formed at the bottom of the outer side of the inclined guide block 21, and a vertical surface 23 is formed on the upper side of the inclined surface 22. The inclined surface 19 and the inclined surface 22 slide against each other. A slot 24 is also formed on the side of the clamping block 18. The side of the through slot 11 is inserted into the slot 24. A rubber block 25 is provided at the bottom of the slot 24. When the vertical surface 20 abuts against the vertical surface 23, the rubber block 25 is pressed tightly. A screw 26 is provided between the housing 1 and the machine base 2. The screw 26 is threadedly connected to the reinforcing plate 8. A drive mechanism is also provided at the end of the screw 26. Source 27, including a servo motor, when the drive screw 26 rotates forward, the reinforcing plate 8 moves downward along the linear guide rail 6. At this time, the inclined surface 19 and the inclined surface 22 gradually separate, and the clamping force of the clamping block 18 on the inclined guide block 21 gradually disappears. At this time, the expansion motor 12 rotates to drive the host 9 to move. When the drive screw 26 rotates in reverse, the inclined surface 19 and the inclined surface 22 gradually come into contact, and the rubber block 25 is compressed. When the rubber block 25 is fully compressed, the vertical surface 20 and the vertical surface 23 come into contact. At this time, the rubber block 25 is pressed against the side end of the through groove 11 and locks the lateral movement of the host 9, increasing the rigidity of the host 9.

[0062] The mounting assembly 5 includes a guide block 28, a positioning component 29, and a clamping cylinder 30. The clamping cylinder 30 is a lever cylinder. Both the guide block 28 and the clamping cylinder 30 are fixedly mounted on the machine base 2 with screws. The positioning component 29 is located at the bottom of the reinforcing plate 8. The positioning component 29 includes three tension blocks 31, a limiting ring 32, and a second inclined guide block 33. The outer side of the tension blocks 31 is arc-shaped. The second inclined guide block 33 has three inclined surfaces 35 in an inverted triangle shape. The inner side of the tension blocks 31 has an inclined surface 34. The inclined surfaces 35 and 34 fit together. The second inclined guide block 33 has a hanging ring groove 36. The limiting ring 32 is slidably mounted in the hanging ring groove 36. The limiting ring 32 has a T-shaped groove 37 arranged in a ring array. T-shaped blocks 38 are fixedly mounted above the tension blocks 31. The T-shaped blocks 38 are slidably mounted in the second T-shaped groove 37.

[0063] When the outer hub shell 90 is placed on the guide block 28, drive source 1 7 and drive source 2 27 drive the main unit 9 and the reinforcing plate 8 to move downwards respectively. At this time, the three tensioning blocks 31 are all inserted into the inner ring of the outer hub shell 90. When the bottom of the tensioning block 31 abuts against the guide block 28, the tensioning block 31 stops moving downwards. The inclined guide block 2 33 continues to move downwards. Through the cooperation between the inclined surface 3 35 and the inclined surface 4 34, the tensioning block 31 moves outwards along the direction of the T-slot 2 37 and gradually abuts against the inner ring of the outer hub shell 90 and straightens the outer hub shell 90. When the predetermined value between the inner ends of the outer hub shell 90 is reached, drive source 2 27 stops driving the reinforcing plate 8 to move. Drive source 1 7 continues to drive the main unit 9 to move downwards and process the connecting hole. At this time, the vertical surface 1 20 and the vertical surface 2 23 are in a sliding state.

[0064] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A method of machining an electric vehicle wheel hub, characterized by: The production process includes the following steps: S1: Preparation of wheel hub raw materials, including aluminum, copper, magnesium, titanium and zirconium, and cleaning and cutting. S2: Melting, casting the outer hub shell (90) and end cap (92) using a mold; S3: Finishing, finishing and post-processing of the outer hub shell (90) and end cap (92); S4: Blanking, using laser cutting to cut out circular plates of the required size; S5: First stamping: The circular plate is placed on the first stamping press by the feeding assembly to form the inner liner (91) prototype. S6: Second stamping: The inner liner (91) after the first stamping is completed is placed on the second stamping press through the material changing assembly to form a flange; S7: Third stamping: The inner liner (91) after the second stamping is placed on the third stamping press through the material changing assembly for the third stamping, and the inner liner (91) is shaped. S8: Fourth stamping: The inner liner (91) after three stampings is placed on the fourth stamping press through the material changing assembly to perform the fourth stamping and cut out the center hole of the inner liner (91). S9: Drilling, using a drilling machine to make an annular connecting hole on the inner liner (91) and the outer hub shell (90); S10: Assembly, fixing the inner liner (91), outer hub shell (90) and end cap (92) with screws; S11: Warehousing; The feeding assembly in the above production step S5 includes an XZ axis moving assembly one (39) and a first conveyor belt (40). The material changing assembly includes an XZ axis moving assembly two (41) and a second conveyor belt (42). The output end of the XZ axis moving assembly one (39) is provided with a suction cup one (43) and a suction cup two (44). The suction cup one (43) is used to place the circular plate on the first conveyor belt (40) onto the first punch press. The suction cup two (44) is used to place the inner liner (91) on the first punch press onto the second conveyor belt (42). Material changing assemblies are provided between the first punch press and the second punch press, between the second punch press and the third punch press, and between the third punch press and the fourth punch press.

2. The method of claim 1, wherein: The drilling machine in S9 includes a Z-axis drive assembly (3), a machining assembly (4), and a mounting assembly (5). The machining assembly (4) is located at the output end of the Z-axis drive assembly (3). The Z-axis drive assembly (3) is used to drive the machining assembly (4) to move up and down. The mounting assembly (5) is used to fix the outer hub shell (90). A reinforcing plate (8) is also provided at the bottom of the machining assembly (4).

3. The method of claim 2, wherein: the first and second portions are formed by a process selected from the group consisting of: machining, casting, and molding. The Z-axis drive assembly (3) includes a linear guide rail (6) and a drive source (7). The machining assembly (4) is located at the output end of the drive source (7). The reinforcing plate (8) is slidably mounted on the linear guide rail (6). The drive source (7) drives the machining assembly (4) and the reinforcing plate (8) to move along the Z-axis.

4. The method for processing an electric vehicle wheel hub according to claim 2, characterized in that: The processing component (4) includes several main units (9), and a drill bit (10) is provided at the output end of the main unit (9). The main unit (9) drives the drill bit (10) to rotate. The main units (9) are arranged in a ring array at the output end of the Z-axis drive component (3). Several through slots (11) are also provided on the reinforcing plate (8). The bottom of the main unit (9) passes through the through slots (11).

5. The method for processing an electric vehicle wheel hub according to claim 4, characterized in that: The processing component (4) also includes a housing (1) and an expansion motor (12). The expansion motor (12) is located inside the housing (1). An expansion block (13) is provided at the output end of the expansion motor (12). The expansion motor (12) is threadedly connected to the expansion block (13). The expansion block (13) has several T-slots (14). Tail blocks (15) are slidably arranged in each T-slot (14). The main unit (9) is fixedly arranged on the tail blocks (15). The housing (1) also has guide posts (16) arranged laterally in the same number as the tail blocks (15). The guide posts (16) are slidably connected to the tail blocks (15). The through slot (11) is long and narrow. A clamp (17) for fixing the main unit (9) is also provided on the outside of the main unit (9).

6. The method for processing an electric vehicle wheel hub according to claim 5, characterized in that: A screw (26) is provided between the Z-axis drive assembly (3) and the mounting assembly (5). The screw (26) is threadedly connected to the reinforcing plate (8). A second drive source (27) is provided at the end of the screw (26). The chuck (17) includes symmetrically arranged clamping blocks (18) on the outside of the host (9). An inclined surface (19) is provided on the inner side of the clamping block (18). An inclined guide block (21) is sleeved on the outside of the host (9). An inclined surface (22) is provided on the outer side of the inclined guide block (21). The inclined surface (19) and the inclined surface (22) slide and cooperate. A slot (24) is provided on the side end of the clamping block (18). The side end of the through groove (11) is inserted into the slot (24).

7. The method for processing an electric vehicle wheel hub according to claim 2, characterized in that: The installation assembly (5) includes a machine base (2), a guide block (28), a positioning component (29), and a clamping cylinder (30). The guide block (28) and the clamping cylinder (30) are both mounted on the machine base (2). The positioning component (29) is mounted on the bottom of the reinforcing plate (8). The positioning component (29) includes several tensioning blocks (31), a limiting ring (32), and a second inclined guide block (33). The second inclined guide block (33) has inclined surfaces (35) in the same number as the tensioning blocks (31). The tensioning block (31) has an inclined surface four (34) on its inner side. The inclined surface three (35) fits into the inclined surface four (34). The inclined guide block two (33) has a hanging ring groove (36). The limiting ring (32) is slidably disposed in the hanging ring groove (36). The limiting ring (32) has a T-shaped groove two (37) arranged in a ring array on its ring. T-shaped blocks (38) are fixedly disposed above the tensioning block (31). The T-shaped blocks (38) are slidably disposed in the T-shaped groove two (37).

Images