阅读说明：本技术 一种排球训练装置 (Volleyball training device ) 是由 张松林 于 2020-07-23 设计创作，主要内容包括：本发明公开了一种排球训练装置,包括用于存放闲置排球的底框,底框上固定有支架,支架通过角度调节机构连接有安装架,安装架上经螺丝固定有T形架,T形架的底部设有两个平行设置用于放置排球的导轨,每个导轨上固定有限位柱,T形架底部位于两个导轨之间的部位安装有作用于排球的弹射机构；T形架的上部连接有拍击机构,所述拍击机构包括经短轴铰接于T形架上部的悬臂、设置于安装架上驱动悬臂后摆的拉绳组件及设置在悬臂与T形架之间用于将悬臂复位并拍击排球的复位件；所述悬臂上还安装有转轮组件,悬臂拍击排球的瞬间,转轮组件作用于排球使排球在拍出后产生旋转。本发明能够发出旋球,进而满足球员接发球的专项训练。(The invention discloses a volleyball training device, which comprises a bottom frame for storing idle volleyballs, wherein a support is fixed on the bottom frame, the support is connected with an installation frame through an angle adjusting mechanism, a T-shaped frame is fixed on the installation frame through screws, two guide rails which are arranged in parallel and used for placing volleyballs are arranged at the bottom of the T-shaped frame, a limiting column is fixed on each guide rail, and an ejection mechanism acting on the volleyballs is arranged at the position, between the two guide rails, at the bottom of the T-shaped frame; the upper part of the T-shaped frame is connected with a patting mechanism, and the patting mechanism comprises a cantilever hinged to the upper part of the T-shaped frame through a short shaft, a pull rope component arranged on the mounting frame and used for driving the cantilever to swing backwards, and a resetting piece arranged between the cantilever and the T-shaped frame and used for resetting the cantilever and patting volleyballs; the cantilever is also provided with a rotating wheel component, and the rotating wheel component acts on the volleyball to rotate the volleyball after being patted at the moment when the cantilever is patted on the volleyball. The invention can send out spin, thereby meeting the special training of the player for taking a shot.)

1. A volleyball training device which characterized in that: the volleyball storage rack comprises a bottom frame (1) used for storing idle volleyballs, wherein a support (2) is fixed on the bottom frame (1), the support (2) is connected with an installation frame (3) through an angle adjusting mechanism (18), a T-shaped frame (4) is fixed on the installation frame (3) through screws, two guide rails (5) which are arranged in parallel and used for placing the volleyballs are arranged at the bottom of the T-shaped frame (4), a limiting column (6) is fixed on each guide rail (5), and an ejection mechanism (7) acting on the volleyballs is installed at a position, between the two guide rails (5), at the bottom of the T-shaped frame; the upper part of the T-shaped frame (4) is connected with a slapping mechanism (8), the slapping mechanism (8) comprises a cantilever (10) which is hinged to the upper part of the T-shaped frame (4) through a short shaft (9), a pull rope component (11) which is arranged on the mounting frame (3) and drives the cantilever (10) to swing backwards, and a resetting piece (36) which is arranged between the cantilever (10) and the T-shaped frame (4) and is used for resetting the cantilever (10) and slapping volleyballs; the rotary wheel assembly (12) is further mounted on the cantilever (10), and when the cantilever (10) beats the volleyball, the rotary wheel assembly (12) acts on the volleyball to enable the volleyball to rotate after being beaten.

2. A volleyball training apparatus according to claim 1, wherein: angle adjustment mechanism (18) are including setting up in mount pad (19) of support (2) both sides, and fixed pivot (20) of being provided with between two mount pads (19), the both sides of mounting bracket (3) are equipped with one curb plate (21) respectively, and the lower part of two curb plates (21) all rotates the setting and is in on pivot (20), fixed mounting has first driving motor (22) between two curb plates (21), and the motor shaft of first driving motor (22) runs through one of them curb plate (21) and is connected with first driving gear (23), be equipped with in pivot (20) with first driving gear (23) engaged with first driven gear (24).

3. A volleyball training apparatus according to claim 1, wherein: the ejection mechanism (7) comprises a hydraulic cylinder body (25), an impact rod (26), a two-position four-way reversing valve (27), a one-way throttle valve (28), an oil pump (29), an oil tank (30) and a safety valve (31), a first clapboard (32) and a second clapboard (33) are sequentially arranged in the hydraulic cylinder body (25) along the axial direction, the first clapboard (32) and the second clapboard (33) divide the interior of the hydraulic cylinder body (25) into a nitrogen cavity (34), an oil cavity (35) and an impact cavity (37), a piston rod (38) is arranged in the oil chamber (35) in a sliding manner, one end of the piston rod (38) penetrates through the first partition plate (32) and extends into the nitrogen chamber (34), the other end of the piston rod (38) penetrates through the second partition plate (33) and extends into the impact cavity (37), a piston plate (39) tightly attached to the inner wall of the oil chamber (35) is arranged in the middle of the piston rod (38), and the oil chamber (35) is divided into a first chamber (40) and a second chamber (41) by the piston plate (39); one end of the hydraulic cylinder body (25) far away from the nitrogen gas cavity (34) is provided with a guide hole (42) for communicating the impact cavity (37) with the outside, the impact rod (26) is arranged in the guide hole (42) in a sliding manner, the impact rod (26) and the piston rod (38) are coaxially arranged, the inner end of the impact rod (26) extends into the impact cavity (37), the outer end of the impact rod (26) extends to the outside of the hydraulic cylinder body (25), the outer wall of the impact rod (26) is circumferentially provided with a limit groove (43), the inner wall of the guide hole (42) is provided with a limit ring (44) matched with the limit groove (43), and the height of the limit ring (44) is smaller than that of the limit groove (43); the oil tank (30) is connected with an oil pump (29) through a pipeline, the oil pump (29) is connected with a one-way throttle valve (28), a P port of the two-position four-way reversing valve (27) is connected with the one-way throttle valve (28), a T port of the two-position four-way reversing valve (27) is connected with the oil tank (30), an A port of the two-position four-way reversing valve (27) is communicated with a first cavity (40) of the hydraulic cylinder body (25), and a B port of the two-position four-way reversing valve (27) is communicated with a second cavity (41) of the hydraulic cylinder body (25); a safety valve (31) is connected between the one-way throttle valve (28) and the oil pump (29), and the safety valve (31) is connected with the oil tank (30).

4. A volleyball training apparatus according to claim 1, wherein: the pull rope assembly (11) comprises a second driving motor (51), a second driving gear (52), a second driven gear (53), a locking block (75), a rotary disc (76), a spring (61) and a pull rope (54), the second driving motor (51) is fixed on the mounting frame (3), a motor shaft of the second driving motor (51) is connected with the second driving gear (52), the second driven gear (53) is rotatably arranged on the mounting frame (3) through a shaft, and the second driven gear (53) is meshed with the second driving gear (52); the locking block (75) is arranged below the mounting frame (3), the locking block (75) and the second driven gear (53) are arranged in a linkage mode, the rotary disc (76) is mounted below the locking block (75) through a rivet (77), a limiting flange (78) attached to the periphery of the locking block (75) is arranged on the peripheral side of the rotary disc (76), a plurality of clutch protrusions (59) are distributed on one side, facing the rotary disc (76), of the locking block (75) in a circumferential array mode, and a plurality of clutch grooves (60) matched with the clutch protrusions (59) are formed in the rotary disc (76); the spring (61) is sleeved on the periphery of the rivet (77), the spring (61) is clamped between the rotary disc (76) and the locking block (75), the locking block (75) is provided with the electromagnet (62), and the rotary disc (76) is provided with an iron block (63) which is used for attracting the electromagnet (62) when the electromagnet (62) is electrified; a fixed column (55) is arranged in the middle of the cantilever (10), one end of the pull rope (54) is fixed on the fixed column (55), and the other end of the pull rope (54) is fixed on the rotary table (76).

5. A volleyball training apparatus according to claim 4, wherein: be equipped with first tensioning axle (56) and second tensioning axle (57) on cantilever (10), the middle part of stay cord (54) is walked around and is established on first tensioning axle (56) and second tensioning axle (57), be equipped with pipe (58) on T shape frame (4), stay cord (54) penetrate in T shape frame (4) and wear out from pipe (58).

6. A volleyball training apparatus according to claim 1, wherein: reset piece (36) including the cover establish two spring body (64) in minor axis (9) periphery, two spring body (64) are connected through U-shaped pole (65), U-shaped pole (65) support on the inner wall of T shape frame (4), and the outer end of two spring body (64) is equipped with an L shape dead lever (66) respectively, a fixed orifices (67) have been seted up respectively to the both sides of cantilever (10), L shape dead lever (66) are inserted and are fixed in corresponding fixed orifices (67).

7. A volleyball training apparatus according to claim 1, wherein: the rotating wheel assembly (12) comprises a third driving motor (45), a driving pulley (46), a driven pulley (47), a belt (48) and a rotating wheel (49), the third driving motor (45) is installed on the cantilever (10), a motor shaft of the third driving motor (45) is connected with the driving pulley (46), the rotating wheel (49) and the driven pulley (47) are installed at the tail end of the cantilever (10) through the same shaft, the belt (48) is wrapped on the driving pulley (46) and the driven pulley (47), a plurality of resistance increasing convex strips (50) are uniformly distributed on the surface of the rotating wheel (49), and the extending direction of the resistance increasing convex strips (50) is perpendicular to the rotating direction of the rotating wheel (49).

8. A volleyball training apparatus according to claim 1, wherein: the limiting column (6) is provided with a stud (69), the guide rail (5) is provided with a plurality of adjusting holes (68) matched with the studs (69), and the studs (69) penetrate through one of the adjusting holes (68) and are fixed through locking nuts (70); the tail end of the limiting column (6) is sleeved with a rubber sleeve (79).

9. A volleyball training apparatus according to claim 1, wherein: the bottom of underframe (1) is equipped with running gear (13), running gear (13) include chassis (14), rotate seat (15), fourth driving motor (71) and athey wheel assembly (16), install in chassis (14) bottom athey wheel assembly (16), fourth driving motor (71) are installed on chassis (14), and the motor shaft and the axis of rotation of fourth driving motor (71) are connected, fixed slot (17) have been seted up at the top of rotating seat (15), underframe (1) inlays to be established in fixed slot (17).

10. A volleyball training apparatus according to claim 9, wherein: one side of the base facing the rotating seat (15) is provided with an annular track groove (72), the rotating seat (15) is provided with a plurality of track columns (73) extending into the annular track groove (72), and the lower ends of the track columns (73) are provided with spheres (74) attached to the bottom wall of the annular track groove (72).

Technical Field

The invention relates to the technical field of sports goods, in particular to a volleyball training device capable of sending spin balls.

Background

The main personal techniques of volleyball are 'serving, passing and buttoning', etc., wherein one-pass serving, i.e. one-pass passing, is one of the important techniques. A dribbling technique of volleyball requires a great deal of service training of lateral spin, spin-up or spin-down with different forces and angles. In the past one-pass special ball-catching training, a ball serving trainer must send various side spin balls to a ball player, so that the ball player can adapt to the ball serving with various difficulties.

The prior volleyball training device can basically complete the serve action, such as blowing and pressing by an air compressor or popping by a spring, but most of the prior volleyball training devices in the market do not have the lateral rotation function, so that the special training of receiving and serving cannot be really met.

Therefore, there is a need for a volleyball training device to solve the above problems in the prior art.

Disclosure of Invention

The invention aims to provide a volleyball training device, which can send a spin and further meet the special training of a player for taking a shot.

In order to achieve the purpose, the invention provides the following technical scheme: a volleyball training device comprises a bottom frame for storing idle volleyballs, wherein a support is fixed on the bottom frame and connected with a mounting frame through an angle adjusting mechanism, a T-shaped frame is fixed on the mounting frame through screws, two guide rails which are arranged in parallel and used for placing volleyballs are arranged at the bottom of the T-shaped frame, a limiting column is fixed on each guide rail, and an ejection mechanism acting on the volleyballs is installed at a position, between the two guide rails, at the bottom of the T-shaped frame; the upper part of the T-shaped frame is connected with a patting mechanism, and the patting mechanism comprises a cantilever hinged to the upper part of the T-shaped frame through a short shaft, a pull rope component arranged on the mounting frame and used for driving the cantilever to swing backwards, and a resetting piece arranged between the cantilever and the T-shaped frame and used for resetting the cantilever and patting volleyballs; the cantilever is also provided with a rotating wheel component, and the rotating wheel component acts on the volleyball to rotate the volleyball after being patted at the moment when the cantilever is patted on the volleyball.

By adopting the technical scheme, when the volleyball is placed on the guide rail, the initial throwing angle of the volleyball can be adjusted through the angle adjusting mechanism, after the volleyball is stabilized, the volleyball is thrown upwards through the ejection mechanism acting on the volleyball, and the slapping mechanism is utilized to slap the volleyball at the moment of the volleyball throwing to complete the service action. The patting mechanism is composed of a cantilever, a pull rope component and a reset component, the pull rope mechanism drives the cantilever to swing backwards in a standby state, the reset component connected with the cantilever accumulates elastic potential energy, meanwhile, a rotating wheel component is further mounted on the cantilever, when the volleyball is thrown upwards, the pull rope mechanism is disconnected from binding the cantilever, the cantilever returns fast under the action of the elastic potential energy released by the reset mechanism and patts the volleyball, and meanwhile, the rotating wheel component acts on the volleyball to enable the volleyball to rotate at a high speed after being patted out, so that the serve action of the volleyball is completed, and the special training of the player for receiving the serve.

The angle adjusting mechanism comprises mounting seats arranged on two sides of a support, a rotating shaft is fixedly arranged between the two mounting seats, two side plates are respectively arranged on two sides of the mounting seats, the lower parts of the two side plates are rotatably arranged on the rotating shaft, a first driving motor is fixedly arranged between the two side plates, a motor shaft of the first driving motor penetrates through one side plate and is connected with a first driving gear, and a first driven gear meshed with the first driving gear is arranged on the rotating shaft.

Through adopting above-mentioned technical scheme, can adjust the initial launch angle of volleyball, and then realize the change of the different angle of serve of volleyball, improve the variety of volleyball service.

The ejection mechanism comprises a hydraulic cylinder body, an impact rod, a two-position four-way reversing valve, a one-way throttle valve, an oil pump, an oil tank and a safety valve, wherein a first partition plate and a second partition plate are sequentially arranged in the hydraulic cylinder body along the axial direction, the first partition plate and the second partition plate divide the interior of the hydraulic cylinder body into a nitrogen cavity, an oil cavity and an impact cavity, a piston rod is arranged in the oil cavity in a sliding mode, one end of the piston rod penetrates through the first partition plate and extends into the nitrogen cavity, the other end of the piston rod penetrates through the second partition plate and extends into the impact cavity, a piston plate tightly attached to the inner wall of the oil cavity is arranged in the middle of the piston rod, and the oil cavity is; the hydraulic cylinder body is provided with a guide hole which is far away from the nitrogen cavity and is communicated with the impact cavity and the outside, the impact rod is arranged in the guide hole in a sliding mode and is coaxial with the piston rod, the inner end of the impact rod extends into the impact cavity, the outer end of the impact rod extends to the outside of the hydraulic cylinder body, a limiting groove is formed in the outer wall of the impact rod along the circumferential direction, a limiting ring matched with the limiting groove is installed on the inner wall of the guide hole, and the height of the limiting ring is smaller than that of the limiting groove; the oil tank is connected with an oil pump through a pipeline, the oil pump is connected with a one-way throttle valve, a port P of the two-position four-way reversing valve is connected with the one-way throttle valve, a port T of the two-position four-way reversing valve is connected with the oil tank, a port A of the two-position four-way reversing valve is communicated with a first cavity of the hydraulic cylinder body, and a port B of the two-position four-way reversing valve is communicated with a second cavity of the hydraulic cylinder body; and a safety valve is connected between the one-way throttle valve and the oil pump and is connected with the oil tank.

By adopting the technical scheme, the ball throwing action of the volleyball can be realized, namely after the oil pump and the one-way throttle valve are started, the S1-level coil of the two-position four-way reversing valve is electrified, the P port and the B port of the two-position four-way reversing valve are communicated, the T port and the A port of the two-position four-way reversing valve are communicated, hydraulic oil enters the second cavity of the hydraulic cylinder body, the hydraulic oil extrudes the piston plate and pushes the piston rod to the direction of the first cavity, and then one end, close to the nitrogen cavity, of the piston rod is continuously pushed into the nitrogen cavity until the piston rod reaches a critical position, and nitrogen in the nitrogen cavity is in a. And then, an S2-level coil of the two-position four-way reversing valve is electrified, so that a port P of the two-position four-way reversing valve is communicated with a port A, a port T of the two-position four-way reversing valve is communicated with a port B, hydraulic oil enters a first cavity of the hydraulic cylinder body, the hydraulic oil extrudes the piston plate and pushes the piston rod towards the direction of a second cavity, meanwhile, high-pressure nitrogen in the nitrogen cavity extrudes the piston rod towards the direction of an impact cavity, great acceleration is given to the piston rod, the piston rod impacts the impact rod at high speed, the impact rod is ejected and impacts volleyball after being impacted by the piston rod, the volleyball is thrown upwards, and the piston rod rebounds to the initial. The structure can realize quick ball throwing, has stable acting force and is beneficial to the debugging work of technicians in the early stage.

The invention is further provided that the pull rope assembly comprises a second driving motor, a second driving gear, a second driven gear, a locking block, a turntable, a spring and a pull rope, wherein the second driving motor is fixed on the mounting frame; the locking block is arranged below the mounting frame and is in linkage with the second driven gear, the turntable is arranged below the locking block through rivets, limit flanges attached to the periphery of the locking block are arranged on the peripheral side of the turntable, a plurality of clutch protrusions are distributed on one side of the locking block, which faces the turntable, in a circumferential array manner, and a plurality of clutch grooves matched with the clutch protrusions are formed in the turntable; the spring jacket is arranged on the periphery of the rivet, the spring jacket is arranged between the rotary table and the locking block, the locking block is provided with an electromagnet, and the rotary table is provided with an iron block which is used for attracting the electromagnet when the electromagnet is electrified; the middle part of the cantilever is provided with a fixed column, one end of the pull rope is fixed on the fixed column, and the other end of the pull rope is fixed on the rotary table.

Through adopting above-mentioned technical scheme, can realize pulling and the regulation of releasing the cantilever, open the second driving motor back promptly, it rotates to drive the locking piece through the gear drive, the iron plate on the carousel is inhaled in the electro-magnet circular telegram on the locking piece makes locking piece and carousel joint produce the linkage, receive the rope and then make the cantilever after-swing when the carousel rotates, the piece energy storage that resets simultaneously, the iron plate is released after the electro-magnet outage, the carousel separates with the locking piece under the effort of spring, the cantilever is pulled back the rope and is patted the volleyball under the effect of reply, realize the action of serving.

The invention is further provided that the cantilever is provided with a first tensioning shaft and a second tensioning shaft, the middle part of the stay cord is wound on the first tensioning shaft and the second tensioning shaft, the T-shaped frame is provided with a guide pipe, and the stay cord penetrates into the T-shaped frame and penetrates out of the guide pipe.

Through adopting above-mentioned technical scheme, the stay cord is rich and is established and to adjust tensile rate of tension on first tensioning axle and the second tensioning axle to avoid the stay cord to relax and influence the result of use. The design of pipe plays the effect of direction to the stay cord, avoids the stay cord to produce the interference to other parts.

The invention is further arranged in that the reset piece comprises two spring bodies sleeved on the periphery of the short shaft, the two spring bodies are connected through a U-shaped rod, the U-shaped rod abuts against the inner wall of the T-shaped frame, the outer ends of the two spring bodies are respectively provided with an L-shaped fixed rod, two sides of the cantilever are respectively provided with a fixed hole, and the L-shaped fixed rods are inserted and fixed in the corresponding fixed holes.

Through adopting above-mentioned technical scheme, can exert spring force to the cantilever, make it slap volleyball fast, and its simple structure, it is very convenient to install.

The invention is further arranged in that the rotating wheel component comprises a third driving motor, a driving belt wheel, a driven belt wheel, a belt and a rotating wheel, the third driving motor is arranged on the cantilever, a motor shaft of the third driving motor is connected with the driving belt wheel, the rotating wheel and the driven belt wheel are arranged at the tail end of the cantilever through the same shaft, the belt is coated on the driving belt wheel and the driven belt wheel, a plurality of resistance-increasing convex strips are uniformly distributed on the surface of the rotating wheel, and the extending direction of the resistance-increasing convex strips is vertical to the rotating direction of the rotating wheel.

Through adopting above-mentioned technical scheme, can provide the revolving force to the volleyball in the twinkling of an eye of the arm slap volleyball, impel the volleyball to produce high-speed rotation after the slap, realize the effect of spin.

The invention is further arranged in that the limiting column is provided with a stud, the guide rail is provided with a plurality of adjusting holes matched with the studs, and the stud penetrates through one of the adjusting holes and is fixed by a locking nut; the tail end of the limiting column is sleeved with a rubber sleeve.

Through adopting above-mentioned technical scheme, conveniently adjust the position of spacing post to corresponding adjustment is made fast according to the volleyball of different specifications. The design of the tail end rubber sleeve of the limiting column can effectively play a role in preventing the volleyball from being separated, and the volleyball is prevented from jumping out of the guide rail due to vibration of the device.

The bottom frame is provided with a travelling mechanism at the bottom, the travelling mechanism comprises a chassis, a rotating seat, a fourth driving motor and a crawler wheel assembly, the crawler wheel assembly is installed at the bottom of the chassis, the fourth driving motor is installed on the chassis, a motor shaft of the fourth driving motor is connected with a rotating shaft, a fixing groove is formed in the top of the rotating seat, and the bottom frame is embedded in the fixing groove.

Through adopting above-mentioned technical scheme, not only make things convenient for holistic removal, can realize the adjustment of direction of serve moreover, satisfy different training demands.

The invention is further arranged in such a way that one side of the base, which faces the rotating seat, is provided with an annular track groove, the rotating seat is provided with a plurality of track columns which extend into the annular track groove, and the lower ends of the track columns are provided with spheres which are attached to the bottom wall of the annular track groove.

Through adopting above-mentioned technical scheme, can improve and rotate the pivoted stability of seat, avoid the device to produce acutely rocking and vibration when moving.

Drawings

FIG. 1 is a schematic structural view of the present invention as a whole;

FIG. 2 is a schematic structural view of an angle adjustment mechanism of the present invention;

FIG. 3 is a schematic view of the hydraulic circuit of the ejection mechanism of the present invention;

FIG. 4 is a schematic view of a first orientation of the clapping mechanism of the present invention;

FIG. 5 is a schematic view of a second orientation of the clapping mechanism of the present invention;

FIG. 6 is a schematic view of the structure of the locking block and the rotary disk;

fig. 7 is a schematic view of the mounting structure of the reset member of the present invention;

FIG. 8 is a schematic view of an installation structure of the spacing post of the present invention;

FIG. 9 is a schematic structural diagram of the traveling mechanism of the present invention;

fig. 10 is an enlarged schematic view of a portion a in fig. 9.

In the figure: 1. a bottom frame; 2. a support; 3. a mounting frame; 4. a T-shaped frame; 5. a guide rail; 6. a limiting column; 7. an ejection mechanism; 8. a slapping mechanism; 9. a minor axis; 10. a cantilever; 11. a pull cord assembly; 12. a rotating wheel assembly; 13. a traveling mechanism; 14. a chassis; 15. a rotating seat; 16. a crawler wheel assembly; 17. fixing grooves; 18. an angle adjusting mechanism; 19. a mounting seat; 20. a rotating shaft; 21. a side plate; 22. a first drive motor; 23. a first drive gear; 24. a first driven gear; 25. a hydraulic cylinder block; 26. an impact bar; 27. a two-position four-way reversing valve; 28. a one-way throttle valve; 29. an oil pump; 30. an oil tank; 31. a safety valve; 32. a first separator; 33. a second separator; 34. a nitrogen chamber; 35. an oil chamber; 36. a reset member; 37. an impingement cavity; 38. a piston rod; 39. a piston plate; 40. a first chamber; 41. a second chamber; 42. a guide hole; 43. a limiting groove; 44. a limiting ring; 45. a third drive motor; 46. a driving pulley; 47. a driven pulley; 48. a belt; 49. a rotating wheel; 50. resistance-increasing convex strips; 51. a second drive motor; 52. a second driving gear; 53. a second driven gear; 54. pulling a rope; 55. fixing a column; 56. a first tensioning shaft; 57. a second tensioning shaft; 58. a conduit; 59. a clutch projection; 60. a clutch groove; 61. a spring; 62. an electromagnet; 63. an iron block; 64. a spring body; 65. a U-shaped rod; 66. an L-shaped fixing rod; 67. a fixing hole; 68. an adjustment hole; 69. a stud; 70. locking the nut; 71. a fourth drive motor; 72. an annular track groove; 73. a trajectory post; 74. a sphere; 75. a locking block; 76. a turntable; 77. riveting; 78. a limiting flange; 79. a rubber sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.