Tennis training device with rotatable tennis ball

Abstract

The invention belongs to the technical field of sports training equipment, and relates to a tennis training device with a rotatable tennis ball, which comprises a base, a fixed rod, a transmission rod, two mounting discs, a rotating shaft, a rotating rod and an elastic reset assembly, the up-and-down reciprocating motion assembly is connected with the transmission rod and used for driving the transmission rod to do up-and-down reciprocating motion, so that the rotating rod swings up and down in the rotating process to adjust the returning angle of the tennis ball. The rotating shaft is rotationally connected with the transmission rod, the rotating rod is hinged to the rotating shaft, the rotating rod can rotate and can vertically swing, the transmission rod is driven by the vertical reciprocating moving assembly to vertically move in a reciprocating mode, the rotating rod vertically swings in the rotating process, and the returning angle of a tennis ball is adjusted; the training device simulates diversified ball coming angles generated when two persons play a tennis ball in practice, prevents a training scene from being disjointed with actual sports, and improves the reaction ability and the ball hitting strain ability of trainees, so that the training effect is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sports training equipment and relates to a tennis training device with a rotatable tennis ball. BACKGROUND

[0002] Tennis is a ball game played across the net with a tennis racket to hit the tennis ball to the opponent's court to force the opponent to fail to return the ball correctly or make a mistake in returning the ball, and can be divided into singles and doubles. Meanwhile, tennis is a sport with high requirements for technical movements and reaction speed, and it is more difficult to master than running and badminton, and it is necessary to undergo long-term targeted training to master basic hitting skills and improve sports level. The "repeated hitting practice in a fixed scene" is the core training content in the entry stage, and therefore a special tennis training device is needed to assist in the serving and hitting training.

[0003] At present, the existing tennis training device includes a base, an elastic rod, a rotating shaft and a rotating rod. The elastic rod and the rotating shaft are vertically arranged on the upper part of the base. The lower end of the elastic rod is fixedly connected with the base, and the lower end of the rotating shaft is rotationally connected with the base. One end of the rotating rod is fixedly connected with the upper end of the rotating shaft, and the other end of the rotating rod is connected with a tennis ball. After a trainer hits the tennis ball, the tennis ball drives the rotating rod to rotate around the rotating shaft. When the rotating rod rotates for one round, the rod body collides with the elastic rod, and the elastic force of the elastic rod can make the rotating rod rotate reversely to finally drive the tennis ball to return to the initial position. The trainer can repeatedly hit the ball to simulate the scene of double-person playing.

[0004] However, since the connection position of the rotating rod and the rotating shaft is fixed, the hitting position and the hitting angle of the trainer are in a single state for a long time, which cannot simulate the diversified coming ball angles of the tennis ball in the actual double-person playing, the training scene is disconnected with the actual sports, and it is difficult to effectively improve the reaction ability and the hitting adaptability of the trainer, thereby reducing the training effect. SUMMARY

[0005] The application aims to provide a tennis training device with a rotatable tennis ball, which can simulate the diversified coming ball angles of the tennis ball in the actual double-person playing, improve the reaction ability and the hitting adaptability of the trainer, and thus improve the training effect.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the application is as follows. A tennis training device with a rotatable tennis ball includes a base, a fixed rod vertically arranged on the upper part of the base near one side of the base, and a transmission rod vertically arranged on the upper part of the base near the other side of the base. The transmission rod is vertically arranged on the upper part of the base and located near the other side of the base. Two mounting discs are horizontally arranged on the upper end of the transmission rod, and the lower mounting disc is rotationally connected with the upper end of the transmission rod. The rotating shaft is vertically fixed between the two mounting plates; The rotating rod has one end hinged to the pivot, and the other end extends to the outside of the fixed rod to connect the tennis ball. The elastic reset component is located on the side of the fixed rod and is used to push the rotating rod back to its original position using elastic force after the rotating rod has rotated one revolution. The reciprocating motion component is connected to the transmission rod and is used to drive the transmission rod to move up and down, so that the rotating rod swings up and down during rotation to adjust the angle at which the tennis ball returns.

[0007] The invention is further characterized by: The elastic reset component includes: an arc-shaped plate disposed on the side of the fixed rod away from the rotating rod; and multiple first elastic elements horizontally disposed between the arc-shaped plate and the transmission rod, wherein the multiple first elastic elements are evenly disposed along the length direction of the transmission rod, and the two ends of each first elastic element are connected to the arc-shaped plate and the transmission rod respectively.

[0008] The reciprocating motion assembly includes: a mounting box, positioned between the base and the transmission rod, with the lower end of the transmission rod passing through the upper part of the mounting box and located inside the mounting box; a transmission plate, horizontally positioned inside the mounting box and below the transmission rod; the transmission plate connected to the lower end of the transmission rod and slidably connected to the inner wall of the mounting box in the vertical direction; a second elastic element, sleeved on the transmission rod and located inside the mounting box; an elliptical wheel, positioned below the transmission plate, with the edge of the elliptical wheel contacting the lower part of the transmission plate; and a motor, positioned on the inner wall of the mounting box and close to the elliptical wheel, with the output end of the motor connected to the elliptical wheel.

[0009] A sleeve is fitted onto the rotating shaft, with a gap between the inner wall of the sleeve and the rotating shaft. The end of the rotating rod is connected to the side of the sleeve. A swing shaft is horizontally installed inside the sleeve, with both ends of the swing shaft fixedly connected to the inner wall of the sleeve. The swing shaft passes through the rotating shaft and is rotatably connected to the rotating shaft. A third elastic element is installed on the upper and lower parts of the sleeve, with both ends of each third elastic element connected to the end of the sleeve and the corresponding mounting plate, respectively. The rotating shaft passes through two third elastic elements.

[0010] A swing groove is provided on the side of the rotating shaft near the swing shaft, and the swing groove is set along the length of the rotating shaft.

[0011] A guide cylinder is slidably sleeved on the fixed rod. The guide cylinder is connected to the transmission rod by a horizontally set guide rod. The upper end of the guide cylinder is close to the arc plate. An angle adjustment component is set between the guide cylinder and the arc plate. The angle adjustment component is used to adjust the tilt angle of the arc plate by moving the guide cylinder up and down.

[0012] The angle adjustment component includes: a guide ring, which is fixedly sleeved on the upper end of the guide cylinder and is located between the arc plate and the guide cylinder. The outer surface of the guide ring is arc-shaped; and an arc-shaped protrusion, which is located on the inner surface of the arc plate and is close to the guide ring.

[0013] A limiting cylinder is fitted on the transmission rod. The lower end of the limiting cylinder is fixedly connected to the upper part of the mounting box. A through groove is opened on the side of the limiting cylinder along its length. The guide rod passes through the through groove and is slidably connected to the inside of the through groove.

[0014] The base has an open structure in the middle and upper part. A lifting plate is horizontally installed in the upper opening of the base. The fixing rod and the mounting box are respectively installed on the lifting plate. A hydraulic cylinder is vertically installed inside the base. The two ends of the hydraulic cylinder are connected to the lifting plate and the bottom of the base, respectively. Multiple telescopic rods are installed inside the base. The multiple telescopic rods are evenly arranged around the hydraulic cylinder. The two ends of each telescopic rod are connected to the lifting plate and the bottom of the base, respectively.

[0015] The tennis training device with a rotating tennis ball according to the present invention has the following advantages: This invention connects the rotating shaft and the transmission rod in a rotatable manner, and hinges the rotating rod to the rotating shaft, allowing the rotating rod to not only rotate but also swing up and down. A reciprocating motion component drives the transmission rod to move up and down repeatedly, causing the rotating rod to swing up and down during rotation. This adjusts the angle of the tennis ball's return, simulating the diverse angles of incoming balls in actual two-person rallies. This avoids a disconnect between the training scenario and actual sports, improves the trainee's reaction time and ball-hitting adaptability, and thus enhances training effectiveness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall main structure of the present invention.

[0017] Figure 2 For the present invention Figure 1 Enlarged view of a local structure in section A.

[0018] Figure 3 This is a top view of the overall structure of the present invention.

[0019] Figure 4 This is a side view of the connection between the arc-shaped plate and the fixed rod in this invention.

[0020] Figure 5 This is a top view of the internal structure of the mounting box in this invention.

[0021] Figure label: 1. Base; 2. Fixed rod; 3. Transmission rod; 4. Rotating rod; 5. Tennis ball; 6. Mounting plate; 7. Rotating shaft; 8. Swing shaft; 9. Sleeve; 10. First elastic element; 11. Second elastic element; 12. Third elastic element; 13. Arc plate; 14. Mounting box; 16. Transmission plate; 17. Elliptical wheel; 18. Motor; 19. Guide rod; 20. Guide cylinder; 21. Guide ring; 22. Arc protrusion; 23. Limiting cylinder; 24. Swing groove; 25. Hydraulic cylinder; 26. Telescopic rod; 27. Counterweight; 28. Lifting plate; 29. ​​Through groove. Detailed Implementation

[0022] The technical solutions of the present invention will now be described clearly and in detail with reference to the accompanying drawings. In the description of the embodiments of the present invention, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, in the description of the embodiments of the present invention, "multiple" refers to two or more. The terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0023] like Figure 1 , Figure 2As shown, this invention provides a tennis trainer with a rotatable tennis ball, including a base 1, a transmission rod 3, two mounting plates 6, a rotating shaft 7, a rotating rod 4, an elastic reset assembly, and a reciprocating motion assembly. A fixed rod 2 is vertically mounted on one side of the upper part of the base 1. The transmission rod 3 is vertically mounted on the upper part of the base 1, with its position near the other side of the base 1. The two mounting plates 6 are horizontally positioned relative to each other above the transmission rod 3. The lower mounting plate 6 is rotatably connected to the upper end of the transmission rod 3. The rotating shaft 7 is vertically fixed between the two mounting plates 6, with its two ends... The rotating rod 4 is fixedly connected to the two mounting plates 6. One end of the rotating rod 4 is hinged to the rotating shaft 7, and the other end of the rotating rod 4 extends to the outside of the fixed rod 2 to connect the tennis ball 5. Initially, the shaft of the rotating rod 4 is in contact with one side of the fixed rod 2. The elastic reset component is located on the side of the fixed rod 2. The elastic reset component is used to push the rotating rod 4 back to its original position using elastic force after the rotating rod 4 rotates one revolution. The up-and-down reciprocating motion component is connected to the transmission rod 3. The up-and-down reciprocating motion component is used to drive the transmission rod 3 to move up and down, so that the rotating rod 4 swings up and down during rotation to adjust the angle of return of the tennis ball 5. This invention, by rotatably connecting the rotating shaft 7 and the transmission rod 3 and hinged the rotating rod 4 to the rotating shaft 7, allows the rotating rod 4 to not only rotate but also swing up and down. Then, by driving the transmission rod 3 to move up and down through the up-and-down reciprocating motion component, the rotating rod 4 swings up and down during rotation to adjust the angle of return of the tennis ball 5. This simulates the diverse incoming ball angles that occur in actual two-person rallies, avoiding the disconnect between the training scenario and actual sports, improving the trainee's reaction ability and ball-hitting adaptability, thereby improving the training effect.

[0024] like Figure 3 , Figure 4 As shown, the elastic reset assembly includes an arc-shaped plate 13 and a plurality of first elastic elements 10. The arc-shaped plate 13 is disposed on the side of the fixed rod 2 away from the rotating rod 4, and the bending direction of the arc-shaped plate 13 is along the circumference of the fixed rod 2. The plurality of first elastic elements 10 are horizontally disposed between the arc-shaped plate 13 and the transmission rod 3. The plurality of first elastic elements 10 are evenly disposed along the length direction of the transmission rod 3. The two ends of each first elastic element 10 are respectively connected to the arc-shaped plate 13 and the transmission rod 3. The arc-shaped plate 13 is reset when it is moved toward the fixed rod 2 by the collision of the rotating rod 4 through the plurality of first elastic elements 10, and the elastic force of the plurality of first elastic elements 10 pushes the rotating rod 4 to reset.

[0025] like Figure 1 , Figure 5As shown, the reciprocating motion assembly includes a mounting box 14, a transmission plate 16, a second elastic element 11, an elliptical wheel 17, and a motor 18. The mounting box 14 is positioned between the base 1 and the transmission rod 3. The lower end of the transmission rod 3 passes through the upper part of the mounting box 14 and is located inside the mounting box 14. The transmission rod 3 is slidably connected to the mounting box 14. The transmission plate 16 is horizontally positioned inside the mounting box 14 and below the transmission rod 3. The transmission plate 16 is connected to the lower end of the transmission rod 3 and is slidably connected to the inner wall of the mounting box 14 in the vertical direction, facilitating the up-and-down sliding of the transmission plate 16 along the inner wall of the mounting box 14. The second elastic element 11 is sleeved on the transmission rod 3 and is located inside the mounting box 14. The wheel 17 is located at the lower part of the transmission plate 16, and the edge of the elliptical wheel 17 contacts the lower part of the transmission plate 16. The motor 18 is located on the inner wall of the mounting box 14, and the position of the motor 18 is close to the elliptical wheel 17. The output end of the motor 18 is connected to the elliptical wheel 17. In the initial stage, one of the closest ends of the elliptical wheel 17 contacts the lower part of the transmission plate 16. The motor 18 is started, and the motor 18 drives the elliptical wheel 17 to rotate. The contact position between the elliptical wheel 17 and the transmission plate 16 moves from the closest end to the farthest end, and then from the farthest end to the closest end, repeating this process. In conjunction with the second elastic element 11, the elliptical wheel 17 is continuously driven to move back and forth, thereby driving the transmission rod 3 to move up and down back and forth, so that the rotating rod 4 swings up and down during the rotation.

[0026] like Figure 2 As shown, a sleeve 9 is fitted on the rotating shaft 7. There is a gap between the inner wall of the sleeve 9 and the rotating shaft 7, which facilitates the swinging of the sleeve 9. The end of the rotating rod 4 is connected to the side of the sleeve 9. A swing shaft 8 is horizontally arranged inside the sleeve 9. The two ends of the swing shaft 8 are fixedly connected to the inner wall of the sleeve 9. The swing shaft 8 passes through the rotating shaft 7 and is rotatably connected to the rotating shaft 7. The upper and lower parts of the sleeve 9 are respectively provided with third elastic elements 12. The two ends of each third elastic element 12 are connected to the end of the sleeve 9 and the corresponding mounting plate 6, respectively. The rotating shaft 7 passes through two third elastic elements 12. Through the two third elastic elements 12, the sleeve 9 can swing left and right and then return to its original position, which allows the rotating rod 4 to swing up and down.

[0027] like Figure 2 As shown, a swing groove 24 is provided through the side of the rotating shaft 7 near the swing shaft 8. The swing groove 24 is set along the length of the rotating shaft 7, so that the swing shaft 8 can move up and down along the swing groove 24, so that the sleeve 9 swings left and right while swinging back and forth, thereby making the rotating rod 4 swing up and down while rotating around the circumference of the rotating rod 4, thereby further increasing the angle of return of the tennis ball 5.

[0028] like Figure 1 , Figure 3 , Figure 4As shown, a guide cylinder 20 is slidably sleeved on the fixed rod 2. The guide cylinder 20 is connected to the transmission rod 3 by a horizontally arranged guide rod 19. That is, the two ends of the guide rod 19 are fixedly connected to the guide cylinder 20 and the transmission rod 3 respectively. The upper end of the guide cylinder 20 is close to the arc plate 13. An angle adjustment component is provided between the guide cylinder 20 and the arc plate 13. The angle adjustment component is used to adjust the tilt angle of the arc plate 13 by moving the guide cylinder 20 up and down, so that after the rotating rod 4 collides with the arc plate 13, the circumferential angle of the rotating rod 4 is adjusted, thereby further increasing the angle of return of the tennis ball 5.

[0029] like Figure 4 As shown, the angle adjustment assembly includes a guide ring 21 and an arc-shaped protrusion 22. The guide ring 21 is fixedly sleeved on the upper end of the guide cylinder 20. The guide ring 21 is located between the arc plate 13 and the guide cylinder 20, so that when the guide ring 21 moves up and down with the guide cylinder 20, it can enter between the arc plate 13 and the fixed rod 2. The outer surface of the guide ring 21 is arc-shaped. The arc-shaped protrusion 22 is located on the inner surface of the arc plate 13 and is close to the guide ring 21. When the guide ring 21 moves up and down with the guide cylinder 20, the guide ring 21 contacts the arc-shaped protrusion 22, pushing the arc-shaped protrusion 22 to move away from the fixed rod 2, thereby adjusting the tilt angle of the arc-shaped protrusion 22.

[0030] like Figure 1 As shown, a limiting cylinder 23 is sleeved on the transmission rod 3. The lower end of the limiting cylinder 23 is fixedly connected to the upper part of the mounting box 14. A through groove 29 is opened on the side of the limiting cylinder 23 along its length direction. The guide rod 19 passes through the through groove 29 and is slidably connected to the inside of the through groove 29. The limiting cylinder 23 limits the transmission rod 3, making the up-and-down movement of the transmission rod 3 more stable. At the same time, the through groove 29 makes the guide rod 19 drive the guide cylinder 20 to move up and down more stably.

[0031] like Figure 1 As shown, the base 1 has an open structure in the middle and upper part. A lifting plate 28 is horizontally arranged in the upper opening of the base 1. The fixing rod 2 and the mounting box 14 are respectively arranged on the lifting plate 28. A hydraulic cylinder 25 is vertically arranged inside the base 1. The two ends of the hydraulic cylinder 25 are connected to the lifting plate 28 and the bottom of the base 1, respectively. Multiple telescopic rods 26 are arranged inside the base 1. The multiple telescopic rods 26 are evenly arranged around the hydraulic cylinder 25. The two ends of each telescopic rod 26 are connected to the lifting plate 28 and the bottom of the base 1, respectively. By extending and retracting the hydraulic cylinder 25, the height of the lifting plate 28 is adjusted, thereby adjusting the height of the tennis ball 5 to accommodate trainees of different heights.

[0032] like Figure 1 As shown, a counterweight 27 is installed inside the base 1 to make training more stable.

[0033] Working principle: When in use, the lifting device is moved to the training ground, and the hydraulic cylinder 25 is activated. By extending and retracting the hydraulic cylinder 25, the height of the lifting plate 28 is adjusted, and the height of the tennis ball 5 is adjusted to suit the height of the trainee.

[0034] When the motor 18 is started, the motor 18 drives the elliptical wheel 17 to rotate. The contact position between the elliptical wheel 17 and the transmission plate 16 moves from the nearest end to the farthest end, and then from the farthest end to the nearest end, repeating this process. In conjunction with the second elastic element 11, the elliptical wheel 17 is continuously driven to move back and forth, which in turn drives the transmission rod 3 to move up and down. This causes the rotating rod 4 to swing up and down during the rotation, thereby driving the tennis ball 5 to move up and down.

[0035] The trainee hits the tennis ball 5, which causes the rotating rod 4 to rotate around the transmission rod 3. While rotating, the rotating rod 4 swings up and down. At the same time, the transmission rod 3 drives the guide rod 19 to move up and down repeatedly. The guide rod 19 drives the guide cylinder 20 to move up and down repeatedly. The guide cylinder 20 drives the guide ring 21 to move up and down repeatedly. When the guide ring 21 contacts the arc-shaped protrusion 22, it pushes the arc-shaped protrusion 22 to move away from the fixed rod 2, thereby adjusting the tilt angle of the arc-shaped protrusion 22. This allows the rotating rod 4 to adjust its circumferential angle after colliding with the arc plate 13, increasing the angle at which the tennis ball 5 returns.

[0036] It is understood that this invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. A tennis training device with a rotatable tennis ball, comprising a base, wherein a fixing rod is vertically arranged on the upper part of the base near one side, characterized in that, include: The transmission rod is vertically mounted on the upper part of the base and positioned close to the other side of the base; Two mounting plates are horizontally positioned at the upper end of the transmission rod, with the lower mounting plate rotatably connected to the upper end of the transmission rod. The rotating shaft is vertically fixed between the two mounting plates; A rotating rod, one end of which is hinged to a pivot, and the other end of which extends to the outside of a fixed rod for connecting a tennis ball; The elastic reset component is located on the side of the fixed rod and is used to push the rotating rod back to its original position using elastic force after the rotating rod has rotated one revolution. The reciprocating motion component is connected to the transmission rod and is used to drive the transmission rod to move up and down, so that the rotating rod swings up and down during rotation to adjust the angle at which the tennis ball returns.

2. A tennis training device with a rotatable tennis ball according to claim 1, characterized in that, The elastic reset assembly includes: an arc-shaped plate disposed on the side of the fixed rod away from the rotating rod; and a plurality of first elastic elements horizontally disposed between the arc-shaped plate and the transmission rod, wherein the plurality of first elastic elements are evenly disposed along the length direction of the transmission rod, and the two ends of each first elastic element are respectively connected to the arc-shaped plate and the transmission rod.

3. A tennis training device with a rotatable tennis ball according to claim 2, characterized in that, The reciprocating motion assembly includes: a mounting box, disposed between the base and the transmission rod, the lower end of the transmission rod passing through the upper part of the mounting box and located inside the mounting box, the transmission rod being slidably connected to the mounting box; a transmission plate, horizontally disposed inside the mounting box and located below the transmission rod, the transmission plate being connected to the lower end of the transmission rod and slidably connected to the inner wall of the mounting box in the vertical direction; a second elastic element, sleeved on the transmission rod and located inside the mounting box; an elliptical wheel, disposed below the transmission plate, the edge of the elliptical wheel contacting the lower part of the transmission plate; and a motor, disposed on the inner wall of the mounting box and located close to the elliptical wheel, the output end of the motor being connected to the elliptical wheel.

4. A tennis training device with a rotatable tennis ball according to claim 3, characterized in that, A sleeve is fitted onto the rotating shaft, and there is a gap between the inner wall of the sleeve and the rotating shaft. The end of the rotating rod is connected to the side of the sleeve. A swing shaft is horizontally arranged inside the sleeve, and both ends of the swing shaft are fixedly connected to the inner wall of the sleeve. The swing shaft passes through the rotating shaft and is rotatably connected to the rotating shaft. A third elastic element is provided on the upper and lower parts of the sleeve, and both ends of each third elastic element are connected to the end of the sleeve and the corresponding mounting plate, respectively. The rotating shaft passes through two third elastic elements.

5. A tennis training device with a rotatable tennis ball according to claim 4, characterized in that, A swing groove is provided on the side of the rotating shaft near the swing shaft, and the swing groove is arranged along the length direction of the rotating shaft.

6. A tennis training device with a rotatable tennis ball according to claim 5, characterized in that, A guide cylinder is slidably sleeved on the fixed rod. The guide cylinder is connected to the transmission rod by a horizontally arranged guide rod. The upper end of the guide cylinder is close to the arc plate. An angle adjustment component is provided between the guide cylinder and the arc plate. The angle adjustment component is used to adjust the tilt angle of the arc plate by moving the guide cylinder up and down.

7. A tennis training device with a rotatable tennis ball according to claim 6, characterized in that, The angle adjustment assembly includes: a guide ring, which is fixedly sleeved on the upper end of the guide cylinder, the guide ring being located between the arc plate and the guide cylinder, and the outer surface of the guide ring being arc-shaped; and an arc-shaped protrusion, which is disposed on the inner surface of the arc plate and is positioned close to the guide ring.

8. A tennis training device with a rotatable tennis ball according to claim 6, characterized in that, A limiting cylinder is fitted on the transmission rod. The lower end of the limiting cylinder is fixedly connected to the upper part of the mounting box. A through groove is opened on the side of the limiting cylinder along its length. The guide rod passes through the through groove and is slidably connected to the inside of the through groove.

9. A tennis training device with a rotatable tennis ball according to claim 3, characterized in that, The base has an open structure in the middle and upper part. A lifting plate is horizontally arranged in the upper opening of the base. The fixing rod and the mounting box are respectively arranged on the lifting plate. A hydraulic cylinder is vertically arranged inside the base. The two ends of the hydraulic cylinder are respectively connected to the lifting plate and the bottom of the base. Multiple telescopic rods are arranged inside the base. The multiple telescopic rods are evenly arranged around the hydraulic cylinder. The two ends of each telescopic rod are respectively connected to the lifting plate and the bottom of the base.

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