Combined unmanned ship for surveying and mapping

Abstract

The invention relates to the field of surveying and mapping unmanned ships, and discloses a combined surveying and mapping unmanned ship which comprises a ship body, a handle is rotatably connected to the outer wall of the ship body, a detection head is fixedly connected to the upper surface of the ship body, a battery box is fixedly connected to the upper surface of the ship body, and a protective net is fixedly connected to the outer wall of the ship body. A first motor is fixedly connected to the interior of the ship body, the output end of the first motor is rotationally connected to the interior of the ship body and fixedly connected with a propelling impeller, a limiting strip is fixedly connected to the outer wall of the output end of the first motor, and a first fixing block is fixedly connected to the outer wall of the ship body. The mounting blocks move to drive the bearing buoys to move so as to adjust the positions of the bearing buoys, weight distribution of the ship body can be optimized, water flow impact and storm interference can be balanced, the inclination or rollover risk of the ship body can be reduced, the ship can flexibly carry different devices according to task types due to the position adjustability, and sailing deviation caused by device weight concentration is avoided; and the multi-scene operation capability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned surveying and mapping vessels, and in particular to a combined unmanned surveying and mapping vessel. Background Art

[0002] Traditional water environment monitoring and water surveying and mapping involves installing monitoring sensors or mapping equipment on survey ships or ocean monitoring ships, with surveyors planning survey lines in advance and drivers controlling survey ships to conduct online surveys. With the emergence of new marine surveying and mapping carriers represented by unmanned ships in recent years, the method of using small ships as carriers, equipped with a variety of monitoring sensors, and completing specific hydrological and water environment element monitoring in a remote control / autonomous working mode has attracted more and more attention. When unmanned ships are in use, in order to ensure their stability while moving in the water, they usually ensure the weight of the hull and add weight-bearing buoys on both sides of the hull.

[0003] However, in the prior art, the position of the weight-bearing buoys is fixed after installation, and it is difficult to adjust according to actual conditions to optimize the weight distribution of the hull. Under the impact of water flow and interference from wind and waves, it is difficult to effectively balance external forces, resulting in a high risk of the hull tilting or capsizing. At the same time, it is not convenient to flexibly carry equipment according to different mission types, and it is easy to cause navigation deviation due to the concentrated weight of the equipment, which limits the operation capability in multiple scenarios and has poor adaptability to diversified tasks. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a combined unmanned boat for surveying and mapping, which solves the problem in the prior art that the position of the weighted buoy is fixed after installation and is difficult to adjust according to actual conditions.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a combined unmanned boat for surveying and mapping, including a hull, an outer wall of the hull is rotatably connected to a handle, an upper surface of the hull is fixedly connected to a detection head, an upper surface of the hull is fixedly connected to a battery box, an outer wall of the hull is fixedly connected to a protective net, an interior of the hull is fixedly connected to a motor 1, an output end of the motor 1 is rotatably connected to the interior of the hull and fixedly connected to a propulsion impeller, an outer wall of the output end of the motor 1 is fixedly connected to a limit strip, an outer wall of the hull is fixedly connected to a fixed block 1, an outer wall of the fixed block 1 is fixedly connected to a sliding rod, an outer wall of the sliding rod is slidably connected to a mounting block, an outer wall of the mounting block is fixedly connected to a load-bearing buoy, an outer wall of the hull is provided with an adjustment mechanism, a deceleration mechanism is provided inside the hull, and a rotating mechanism is provided on the upper surface of the hull.

[0006] Preferably, the adjustment mechanism comprises a second motor, an outer wall of the second motor is fixedly connected to the outer wall of the hull, an output end of the second motor is fixedly connected to an adjustment rod, and an adjustment column is fixedly connected to the inside of the adjustment rod.

[0007] Preferably, the adjustment mechanism also includes a sliding cylinder, the inner wall of the sliding cylinder is slidably connected to the outer wall of the limit bar, the inner wall of the sliding cylinder is slidably connected to the outer wall of the output end of motor 1, the outer wall of the sliding cylinder is fixedly connected to an adjusting gear, the outer wall of the sliding cylinder is fixedly connected to an adjusting ring, the outer wall of the sliding cylinder is fixedly connected to bevel gear 1, and the outer wall of the adjusting column is slidably connected to the inner wall of the adjusting ring.

[0008] Preferably, the deceleration mechanism comprises a rotating rod, the outer wall of which is rotatably connected to the inside of the hull, the outer wall of which is fixedly connected to a circular gear 2, the tooth end of which is meshingly connected to the tooth end of the adjusting gear.

[0009] Preferably, a gear three is fixedly connected to the outer wall of the rotating rod, and a speed reducer one is fixedly connected to the outer wall of the rotating rod.

[0010] Preferably, the deceleration mechanism also includes a transmission gear 1, the tooth end of the transmission gear 1 is meshingly connected with the tooth end of the gear 3, the interior of the transmission gear 1 is fixedly connected with a rotating column 2, and the outer wall of the rotating column 2 is rotatably connected to the interior of the hull.

[0011] Preferably, the tooth end of the transmission gear one is meshingly connected with the transmission gear two, the interior of the transmission gear two is fixedly connected with a rotating column three, the outer wall of the rotating column three is rotatably connected to the interior of the hull, and the outer wall of the rotating column three is fixedly connected with a speed reducer two.

[0012] Preferably, the rotating mechanism includes a fixed block 2, the lower surface of which is fixedly connected to the upper surface of the hull, the interior of the fixed block 2 is rotatably connected to a worm, the tooth end of the worm is meshingly connected to a worm wheel, the inner wall of the worm wheel is fixedly connected to a rotating column 1, the outer wall of the rotating column 1 is rotatably connected to the interior of the hull, the outer wall of the rotating column 1 is fixedly connected to a bevel gear 2, and the tooth end of the bevel gear 2 is meshingly connected to the tooth end of the bevel gear 1.

[0013] Preferably, the rotating mechanism further comprises a rotating wheel 1, the inner wall of the rotating wheel 1 is fixedly connected to the outer wall of the worm, the outer wall of the rotating wheel 1 is provided with a belt, and the inner wall of the belt is connected to the rotating wheel 2.

[0014] Preferably, the rotating mechanism further comprises a threaded rod, the outer wall of which is fixedly connected to the inner wall of the second rotating wheel, the outer wall of which is rotatably connected to the interior of the first fixing block, and the outer wall of which is threadedly connected to the interior of the mounting block.

[0015] Working principle: When the position of the load-bearing buoy needs to be adjusted, start motor 2. The start of motor 2 causes the adjusting rod to rotate, and the rotation of the adjusting rod drives the adjusting column to rotate. During the rotation of the adjusting column, it will slide on the inner wall of the adjusting ring and push the sliding cylinder to move through the adjusting ring to slide on the output end of motor 1 and the outer wall of the limit strip. During the movement of the sliding cylinder, the sliding cylinder will drive the engagement between bevel gear 1 and bevel gear 2, and at the same time cause the engagement between the adjusting gear and circular gear 2, and then start motor 1, so that the reduction mechanism and the rotating mechanism can operate.

[0016] After the bevel gear one and the bevel gear two are meshed with each other through the adjusting mechanism, the bevel gear two will rotate. The rotation of the bevel gear two drives the rotating column one to rotate, and then the worm wheel rotates. The rotation of the worm wheel drives the worm to rotate, and then the rotating wheel one rotates. The rotation of the rotating wheel one drives the rotating wheel two to rotate through the belt. The rotation of the rotating wheel two drives the threaded rod to rotate inside the fixed block one and also inside the mounting block, so that the mounting block drives the load-bearing buoy to move to adjust the position of the load-bearing buoy.

[0017] After the adjusting mechanism causes the adjusting gear and the tooth ends of circular gear 2 to mesh with each other, start motor 1, causing the adjusting gear to rotate through circular gear 2, driving the rotating rod to rotate inside the hull and driving gear 3 to rotate, while causing speed reducer 1 to unfold; speed reducer 1 rotates through transmission gear 1, driving rotating column 2 to rotate inside the hull and driving transmission gear 2 to rotate; transmission gear 2 rotates through rotating column 3, driving speed reducer 2 to unfold at the bottom of the ship to decelerate the hull.

[0018] The present invention provides a combined unmanned ship for surveying and mapping. It has the following beneficial effects: 1. The present invention adjusts the position of the load-bearing buoy by moving the mounting block to drive the movement of the load-bearing buoy, which can optimize the weight distribution of the hull, balance the impact of water flow and the interference of wind and waves, and reduce the risk of hull tilting or capsizing. The adjustable position allows the ship to flexibly carry different equipment according to the mission type, avoid navigation deviation caused by the concentration of equipment weight, and improve multi-scenario operation capabilities.

[0019] 2. The present invention drives the deceleration plate 2 to deploy at the bottom of the ship through the rotating column 3 to decelerate the hull. The deceleration can make the unmanned boat respond more slowly to the force of the water flow during the position adjustment of the load-bearing buoy, reduce the interference of the water flow on the posture of the hull, and allow the operator to have more sufficient time to observe and control the state changes of the hull, making the control more stable and precise.

[0020] 3. The present invention can adjust the position of the load-bearing buoy and decelerate the hull during the adjustment process by cooperating between the adjustment component and the output end of the motor 1, without the need for additional output equipment, thereby reducing the number and complexity of parts on the ship. This not only reduces the manufacturing and maintenance costs of the unmanned ship, but also reduces the weight of the hull and improves the maneuverability and efficiency of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic cross-sectional view of the internal structure of the hull of the present invention; Figure 3 for Figure 2 The enlarged schematic diagram at A in the middle; Figure 4 It is a schematic diagram of the local structure of the adjusting rod of the present invention; Figure 5 It is a schematic diagram of the local structure of the propulsion impeller of the present invention; Figure 6 It is a partial structural schematic diagram of a transmission gear of the present invention; Figure 7 It is a schematic diagram of the partial structure of the second fixing block of the present invention.

[0022] Among them, 1. hull; 2. handle; 3. battery box; 4. detection head; 5. protective net; 6. motor one; 7. propulsion impeller; 8. limit strip; 9. fixed block one; 10. threaded rod; 11. sliding rod; 12. mounting block; 13. load-bearing buoy; 14. motor two; 15. adjusting rod; 16. adjusting column; 17. sliding cylinder; 18. adjusting ring; 19. bevel gear one; 20. adjusting gear; 21. bevel gear two; 22. rotating column one; 23. worm gear; 24. worm; 25. fixed block two; 26. turntable one; 27. belt; 28. turntable two; 29. ​​circular gear two; 30. rotating rod; 31. gear three; 32. speed reducer one; 33. transmission gear one; 34. rotating column two; 35. transmission gear two; 36. speed reducer two; 37. rotating column three. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Please see attached Figure 1 - Attachment Figure 7The embodiment of the present invention provides a combined unmanned boat for surveying and mapping, including a hull 1, a handle 2 is rotatably connected to the outer wall of the hull 1, a detection head 4 is fixedly connected to the upper surface of the hull 1, a battery box 3 is fixedly connected to the upper surface of the hull 1, a protective net 5 is fixedly connected to the outer wall of the hull 1, a motor 6 is fixedly connected to the inside of the hull 1, the output end of the motor 6 is rotatably connected to the inside of the hull 1 and fixedly connected to a propulsion impeller 7, the outer wall of the output end of the motor 6 is fixedly connected to a limit strip 8, the outer wall of the hull 1 is fixedly connected to a fixed block 9, the outer wall of the fixed block 9 is fixedly connected to a sliding rod 11, the outer wall of the sliding rod 11 is slidably connected to a mounting block 12, the outer wall of the mounting block 12 is fixedly connected to a load-bearing buoy 13, the outer wall of the hull 1 is provided with an adjustment mechanism, the inside of the hull 1 is provided with a deceleration mechanism, and the upper surface of the hull 1 is provided with a rotating mechanism.

[0025] Specifically, the load-bearing buoy 13 is detachably connected to both sides of the hull 1, the propulsion impeller 7 is rotatably arranged at the rear end of the hull 1, and cooperates with the motor 6 to realize the movement of the hull 1. The protective net 5 is connected to the rear end of the hull 1 and is arranged around the propulsion motor 6 to prevent underwater foreign objects from approaching the impeller and affecting the rotation of the motor 6. A handle 2 is set at the head of the hull 1. When it needs to be carried, just turn the handle 2 to open it. The detection head 4 is used for surveying and mapping, and can be disassembled, replaced or adapted to different types of surveying and mapping equipment according to actual needs. The battery box 3 is used to provide power. The adjustment mechanism is used to transmit the deceleration mechanism and the rotation mechanism. The rotation mechanism is used to adjust the position of the load-bearing buoy 13, optimize the weight distribution of the hull 1, balance the impact of water flow and the interference of wind and waves, and reduce the risk of tilting or capsizing of the hull 1. The deceleration mechanism is used to decelerate the hull 1 in the process of adjusting the position of the load-bearing buoy 13, thereby improving stability.

[0026] Please see attached Figure 2 - Attachment Figure 5 The adjusting mechanism includes a motor 2 14, the outer wall of the motor 2 14 is fixedly connected to the outer wall of the hull 1, the output end of the motor 2 14 is fixedly connected to an adjusting rod 15, and the inside of the adjusting rod 15 is fixedly connected to an adjusting column 16; the adjusting mechanism also includes a sliding cylinder 17, the inner wall of the sliding cylinder 17 is slidably connected to the outer wall of the limit strip 8, the inner wall of the sliding cylinder 17 is slidably connected to the outer wall of the output end of the motor 1 6, the outer wall of the sliding cylinder 17 is fixedly connected to an adjusting gear 20, the outer wall of the sliding cylinder 17 is fixedly connected to an adjusting ring 18, the outer wall of the sliding cylinder 17 is fixedly connected to a bevel gear 19, and the outer wall of the adjusting column 16 is slidably connected to the inner wall of the adjusting ring 18.

[0027] Specifically, the adjusting mechanism is used to transmit the speed reduction mechanism and the rotating mechanism. When the position of the load-bearing buoy 13 needs to be adjusted, the motor 2 14 is started. The starting of the motor 2 14 causes the adjusting rod 15 to rotate. The rotation of the adjusting rod 15 drives the adjusting column 16 to rotate. During the rotation of the adjusting column 16, it will slide on the inner wall of the adjusting ring 18 and push the sliding cylinder 17 to move through the adjusting ring 18 to slide on the output end of the motor 1 6 and the outer wall of the limit bar 8. During the movement of the sliding cylinder 17, the sliding cylinder 17 will drive the bevel gear 1 19 to mesh with the bevel gear 2 21, and at the same time promote the meshing between the adjusting gear 20 and the circular gear 2 29. Then the motor 1 6 is started again, so that the speed reduction mechanism and the rotating mechanism can operate.

[0028] Please see attached Figure 2 , Attachment Figure 3 , Attachment Figure 5 and attached Figure 6 The reduction mechanism includes a rotating rod 30, the outer wall of which is rotatably connected to the inside of the hull 1, and the outer wall of the rotating rod 30 is fixedly connected with a circular gear 29, and the tooth end of the circular gear 29 is meshingly connected with the tooth end of the adjusting gear 20; the outer wall of the rotating rod 30 is fixedly connected with a gear 31, and the outer wall of the rotating rod 30 is fixedly connected with a reduction plate 1 32; the reduction mechanism also includes a transmission gear 1 33, the tooth end of the transmission gear 1 33 is meshingly connected with the tooth end of the gear 31, the interior of the transmission gear 1 33 is fixedly connected with a rotating column 2 34, and the outer wall of the rotating column 2 34 is rotatably connected to the inside of the hull 1; the tooth end of the transmission gear 1 33 is meshingly connected with a transmission gear 2 35, the interior of the transmission gear 2 35 is fixedly connected with a rotating column 3 37, the outer wall of the rotating column 37 is rotatably connected to the inside of the hull 1, and the outer wall of the rotating column 37 is fixedly connected with a reduction plate 2 36.

[0029] Specifically, after the adjusting mechanism causes the adjusting gear 20 and the tooth ends of the circular gear 29 to mesh with each other, during the startup of the motor 1 6, the output end of the motor 1 6 will rotate, thereby causing the adjusting gear 20 to rotate. The adjusting gear 20 rotates through the circular gear 29 to drive the rotating rod 30 to rotate inside the hull 1 and drive the gear 3 31 to rotate, while causing the deceleration plate 1 32 to unfold. The deceleration plate 1 32 rotates through the transmission gear 1 33 to drive the rotating column 2 34 to rotate inside the hull 1 and drive the transmission gear 2 35 to rotate. The transmission gear 2 35 rotates through the rotating column 37 to drive the deceleration plate 2 36 to unfold at the bottom of the ship to decelerate the hull 1. The deceleration can make the unmanned boat respond more slowly to the force of the water flow during the position adjustment of the load-bearing buoy 13, reduce the interference of the water flow on the posture of the hull 1, and allow the operator to have more sufficient time to observe and control the state changes of the hull 1, making the control smoother and more precise.

[0030] Please see attached Figure 2 - Attachment Figure 7The rotating mechanism includes a fixed block 25, the lower surface of which is fixedly connected to the upper surface of the hull 1, a worm 24 is rotatably connected inside the fixed block 25, the tooth end of the worm 24 is meshingly connected to the worm wheel 23, the inner wall of the worm wheel 23 is fixedly connected to a rotating column 22, the outer wall of the rotating column 22 is rotatably connected to the inside of the hull 1, the outer wall of the rotating column 22 is fixedly connected to a bevel gear 21, the tooth end of the bevel gear 21 is meshingly connected to the tooth end of the bevel gear 19; the rotating mechanism also includes a rotating wheel 26, the inner wall of the rotating wheel 26 is fixedly connected to the outer wall of the worm 24, the outer wall of the rotating wheel 26 is provided with a belt 27, and the inner wall of the belt 27 is connected to a rotating wheel 28; the rotating mechanism also includes a threaded rod 10, the outer wall of the threaded rod 10 is fixedly connected to the inner wall of the rotating wheel 28, the outer wall of the threaded rod 10 is rotatably connected to the inside of the fixed block 9, and the outer wall of the threaded rod 10 is threadedly connected to the inside of the mounting block 12.

[0031] Specifically, after the bevel gear 19 is meshed with the tooth end of the bevel gear 21 through the adjusting mechanism, the bevel gear 21 will rotate at this time. The rotation of the bevel gear 21 drives the rotating column 1 22 to rotate, thereby rotating the worm gear 23. The rotation of the worm gear 23 drives the worm 24 to rotate, thereby rotating the runner 1 26. The rotation of the runner 1 26 drives the runner 2 28 to rotate through the belt 27. The rotation of the runner 28 causes the threaded rod 10 to rotate inside the fixed block 1 9 and also inside the mounting block 12, thereby causing the mounting block 12 to drive the load-bearing buoy 13 to move to adjust the position of the load-bearing buoy 13. By adjusting the position of the load-bearing buoy 13, the weight distribution of the hull 1 can be optimized, the impact of water flow and the interference of wind and waves can be balanced, and the risk of tilting or capsizing of the hull 1 can be reduced. The adjustable position of the load-bearing buoy 13 enables the ship to flexibly carry different equipment according to the mission type, avoids navigation deviation caused by the concentration of equipment weight, and improves the multi-scenario operation capability.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined unmanned surveying and mapping vessel, comprising a vessel body (1), characterized in that: The outer wall of the hull (1) is rotatably connected to a handle (2), the upper surface of the hull (1) is fixedly connected to a detection head (4), the upper surface of the hull (1) is fixedly connected to a battery box (3), the outer wall of the hull (1) is fixedly connected to a protective net (5), the interior of the hull (1) is fixedly connected to a motor 1 (6), the output end of the motor 1 (6) is rotatably connected to the interior of the hull (1) and fixedly connected to a propulsion impeller (7), the outer wall of the output end of the motor 1 (6) is fixedly connected to a limit strip (8), the outer wall of the hull (1) is fixedly connected to a fixing block 1 (9), the outer wall of the fixing block 1 (9) is fixedly connected to a sliding rod (11), the outer wall of the sliding rod (11) is slidably connected to a mounting block (12), the outer wall of the mounting block (12) is fixedly connected to a load-bearing buoy (13), the outer wall of the hull (1) is provided with an adjustment mechanism, the interior of the hull (1) is provided with a speed reduction mechanism, and the upper surface of the hull (1) is provided with a rotation mechanism.

2. The combined unmanned surveying and mapping ship according to claim 1, characterized in that: The adjustment mechanism comprises a second motor (14), the outer wall of the second motor (14) being fixedly connected to the outer wall of the hull (1), the output end of the second motor (14) being fixedly connected to an adjustment rod (15), and the interior of the adjustment rod (15) being fixedly connected to an adjustment column (16).

3. The combined unmanned ship for surveying and mapping according to claim 2, characterized in that: The adjustment mechanism further comprises a sliding cylinder (17), the inner wall of the sliding cylinder (17) being slidably connected to the outer wall of the limit strip (8), the inner wall of the sliding cylinder (17) being slidably connected to the outer wall of the output end of the motor 1 (6), the outer wall of the sliding cylinder (17) being fixedly connected to an adjustment gear (20), the outer wall of the sliding cylinder (17) being fixedly connected to an adjustment ring (18), the outer wall of the sliding cylinder (17) being fixedly connected to a bevel gear 1 (19), and the outer wall of the adjustment column (16) being slidably connected to the inner wall of the adjustment ring (18).

4. The combined unmanned ship for surveying and mapping according to claim 2, characterized in that: The speed reduction mechanism comprises a rotating rod (30), the outer wall of which is rotatably connected to the interior of the hull (1), the outer wall of which is fixedly connected to a second circular gear (29), the tooth end of which is meshingly connected to the tooth end of the adjusting gear (20).

5. The combined unmanned ship for surveying and mapping according to claim 4, characterized in that: A gear three (31) is fixedly connected to the outer wall of the rotating rod (30), and a speed reducer one (32) is fixedly connected to the outer wall of the rotating rod (30).

6. The combined unmanned ship for surveying and mapping according to claim 2, characterized in that: The speed reduction mechanism further comprises a transmission gear 1 (33), the tooth end of the transmission gear 1 (33) being meshingly connected with the tooth end of the gear 3 (31), a rotating column 2 (34) being fixedly connected inside the transmission gear 1 (33), and an outer wall of the rotating column 2 (34) being rotatably connected inside the hull (1).

7. The combined unmanned ship for surveying and mapping according to claim 6, characterized in that: The tooth end of the transmission gear 1 (33) is meshingly connected with the transmission gear 2 (35), the interior of the transmission gear 2 (35) is fixedly connected with a rotating column 3 (37), the outer wall of the rotating column 3 (37) is rotatably connected to the interior of the hull (1), and the outer wall of the rotating column 3 (37) is fixedly connected with a speed reducer 2 (36).

8. The combined unmanned ship for surveying and mapping according to claim 7, characterized in that: The rotating mechanism comprises a second fixed block (25), the lower surface of the second fixed block (25) being fixedly connected to the upper surface of the hull (1), the interior of the second fixed block (25) being rotatably connected to a worm (24), the tooth end of the worm (24) being meshingly connected to a worm wheel (23), the inner wall of the worm wheel (23) being fixedly connected to a first rotating column (22), the outer wall of the first rotating column (22) being rotatably connected to the interior of the hull (1), the outer wall of the first rotating column (22) being fixedly connected to a second bevel gear (21), the tooth end of the second bevel gear (21) being meshingly connected to the tooth end of the first bevel gear (19).

9. The combined unmanned ship for surveying and mapping according to claim 8, characterized in that: The rotating mechanism further comprises a rotating wheel (26), the inner wall of the rotating wheel (26) being fixedly connected to the outer wall of the worm (24), the outer wall of the rotating wheel (26) being provided with a belt (27), and the inner wall of the belt (27) being connected to a rotating wheel (28).

10. The combined unmanned ship for surveying and mapping according to claim 8, characterized in that: The rotating mechanism further comprises a threaded rod (10), the outer wall of the threaded rod (10) being fixedly connected to the inner wall of the second rotating wheel (28), the outer wall of the threaded rod (10) being rotatably connected to the interior of the first fixing block (9), and the outer wall of the threaded rod (10) being threadably connected to the interior of the mounting block (12).

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