A power transmission device for a rear axle of an electric tricycle

Abstract

The utility model provides a kind of electric tricycle rear axle power transmission device, it is related to electric traffic tool field, the utility model includes rear axle main body, two rear axle rods and transmission case, the utility model is set by setting lubricating device, during the use of electric tricycle, can periodically start electric telescopic link drive piston plate to one end movement, then the lubricating oil inside oil tank extrusion into flow guide pipe, then make it enter the inside of atomizing nozzle and spray, simultaneously start motor again drive atomizing nozzle in the inner wall of support back and forth rotation, lubricating oil is evenly applied on the outer surface of bevel gear ring block, then under the meshing rotation of bevel gear ring block and bevel gear, lubricating oil can be evenly applied on bevel gear, lubrication maintenance treatment is carried out, to slow down the aging and corrosion of bevel gear and bevel gear ring block outer surface, avoid damage, improve meshing degree to ensure the safety of vehicle, improve the service life of vehicle.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicles, and in particular to a power transmission device for the rear axle of an electric tricycle. Background Technology

[0002] A power transmission device is a system that transmits the power generated by an electric motor to the rear axle of a tricycle through a series of transmission components. Its main function is to convert the mechanical energy of the electric motor into driving force for the rear wheels, thus propelling the electric tricycle.

[0003] During the operation of the rear axle of an electric tricycle, the transmission box is fixedly installed on the tricycle frame. The output end of the motor is then connected to the bevel gear via a coupling. Starting the motor drives the bevel gear to rotate on the transmission box, which in turn drives the bevel gear ring block fixed on the rear axle to rotate. This causes the rear axle and rear axle rod to rotate, driving the rear wheels of the electric tricycle. After prolonged use, the outer surfaces of the bevel gear ring block and bevel gear may corrode and age, increasing the meshing friction between them and generating noise. It may also cause poor meshing between the gears, easily damaging the bevel gear ring block and bevel gear, and ultimately leading to serious mechanical failures, affecting the safety and service life of the vehicle. Utility Model Content

[0004] The purpose of this invention is to provide an automatic on / off test fixture for touch screen sensors, aiming to solve the problems in the prior art.

[0005] This utility model is implemented as follows: an electric tricycle rear axle power transmission device includes a rear axle body, two rear axle rods, and a transmission box. The two rear axle rods are respectively installed through the transmission box and on both sides of the rear axle body. A bevel gear ring block is fixedly installed on the outer surface of one end of the rear axle body. A bevel gear is installed through one side of the inner wall of the transmission box, wherein the outer surface of the bevel gear meshes with the outer surface of the bevel gear ring block. A lubrication device is provided on one side of the transmission box. The lubrication device can inject lubricating oil into the oil tank, and then push the lubricating oil in the oil tank into the atomizing nozzle through an electric telescopic rod driving a piston plate, and then spray it on the bevel gear ring block and bevel gear to lubricate and maintain them, and slow down aging and corrosion.

[0006] The aforementioned components achieve the following effects: During the operation of the rear axle body of the electric tricycle, the transmission box is fixedly installed on the electric tricycle frame. Then, the output end of the motor is connected to the bevel gear via a coupling. Starting the motor drives the bevel gear to rotate on the transmission box, which in turn drives the bevel gear ring block fixed on the rear axle body to rotate. This causes the rear axle body and rear axle rod to rotate, driving the rear wheel of the electric tricycle. During use, the lubrication device can be activated periodically to spray lubricating oil onto the bevel gear and bevel gear ring block, thereby slowing down the aging and corrosion of the outer surface of the bevel gear and bevel gear ring block, preventing damage, improving meshing, ensuring vehicle safety, and extending the service life of the vehicle.

[0007] Preferably, the lubrication device includes a mounting plate, one end of which is inserted into the inner wall of one side of the transmission box, and a detachable mechanism is provided between one side of the mounting plate and one side of the transmission box; an oil tank, one side of which is fixedly mounted on one side of the mounting plate; two brackets, one side of which is fixedly mounted on one side of the mounting plate; an atomizing nozzle, both ends of which are respectively mounted through one side of the two brackets; a motor, one side of which is fixedly mounted on one side of the bracket, and its output end is fixedly mounted on one side of the atomizing nozzle by means of a coupling; a guide pipe, one end of which is mounted through one side of the mounting plate, and both ends of which are respectively mounted through one side of the atomizing nozzle and one side of the oil tank; a piston plate, the outer surface of which is slidably connected to the inner wall of the oil tank; and an electric telescopic rod, one side of which is fixedly mounted on one side of the inner wall of the oil tank, and its output end is fixedly mounted on one side of the piston plate.

[0008] The effects achieved by the above-mentioned components are as follows: By setting up a lubrication device, lubricating oil can be injected into the oil tank during the maintenance of the electric tricycle. When lubricating oil is injected, the electric telescopic rod is in a retracted state, and the piston plate is located between the inlet of the oil tank and one side of the inner wall, also in a retracted state. Then, during the use of the electric tricycle, the electric telescopic rod can be started periodically to drive the piston plate to one end, and then the lubricating oil inside the oil tank is squeezed into the guide pipe, and then it enters the interior of the atomizing nozzle and is sprayed out. At the same time, the motor is started to drive the atomizing nozzle to rotate back and forth in the inner wall of the bracket, so that the lubricating oil is evenly applied to the outer surface of the bevel gear ring block. Then, under the meshing rotation of the bevel gear ring block and the bevel gear, the lubricating oil can be evenly applied to the bevel gear, performing lubrication maintenance treatment. This slows down the aging and corrosion of the outer surface of the bevel gear and the bevel gear ring block, avoids damage, improves the meshing degree to ensure the safety of the vehicle, and extends the service life of the vehicle.

[0009] Preferably, a reinforcing rod is symmetrically fixedly installed on the outer surface of the output end of the electric telescopic rod, and one side of the reinforcing rod is fixedly installed on one side of the piston plate.

[0010] The effect achieved by the above components is that by setting up reinforcing rods, the connection area between the output end of the electric telescopic rod and the piston plate can be increased, making the connection more secure and stable, and less prone to breakage or damage.

[0011] Preferably, a bearing is fixedly installed on the outer surface of one end of the guide tube, and the outer ring of the bearing is fixedly installed on one side of the atomizing nozzle.

[0012] The effect achieved by the above components is that by setting bearings, the rotational wear between the guide tube and the atomizing nozzle can be reduced, thereby increasing the service life of both.

[0013] Preferably, the lubrication device further includes a plurality of filter screens, wherein the outer surface of the filter screens is fixedly installed in the inner wall at the outlet of the atomizing nozzle.

[0014] The effect achieved by the above components is that by setting up a filter screen, the inner wall of the outlet of the atomizing nozzle can be protected, making it difficult for external dust and impurities to enter the interior of the outlet of the atomizing nozzle, thus avoiding blockage.

[0015] Preferably, the detachable mechanism includes a plurality of first circular hole blocks, wherein one side of the first circular hole blocks is fixedly installed on one side of the rotating box; a plurality of second circular hole blocks, wherein one side of the second circular hole blocks is fixedly installed on one side of the mounting plate; a plurality of locking rods, wherein one end of the locking rods is inserted into the inner wall of the first and second circular hole blocks; and a plurality of springs, wherein the inner wall of the springs is sleeved on the outer surface of one end of the locking rods, and both ends are fixedly installed on one side of the second circular hole block and one side of the locking rods, respectively.

[0016] The effect achieved by the above-mentioned components is as follows: by setting a detachable mechanism, before using the electric tricycle, the lever can be pulled to one end in the inner wall of the second round hole block, causing the spring to be stretched open. Then, one end of the mounting plate is inserted into the inner wall of the transmission box. At this time, the lever is released, and under the reset action of the spring, it can be inserted into the inner wall of the first round hole block, fixing the mounting plate on one side of the transmission box. The reverse operation can remove the mounting plate and the oil tank for easy replacement and maintenance.

[0017] Preferably, the detachable mechanism further includes two connecting rods, wherein the two ends of the connecting rods are respectively fixedly installed on one side of two adjacent locking rods.

[0018] The effect achieved by the above components is that, by setting a connecting rod, when it is necessary to remove them, simply hold the connecting rod and pull it to pull both locking rods to one end at the same time, which facilitates disassembly and reduces the number of operation steps.

[0019] Preferably, one end of the mounting plate has a trapezoidal longitudinal section, and the dimension of the end of the mounting plate away from the second circular hole block is smaller than that of the other end.

[0020] The effect achieved by the above components is that by setting one end of the mounting plate in a trapezoidal shape, the area of ​​one end of the mounting plate can be reduced, making it easier to quickly align with the inner wall of the transmission box and insert it, thus facilitating installation.

[0021] The beneficial effects of this utility model's disclosed rear axle power transmission device for an electric tricycle are as follows: By setting up a lubrication device, lubricating oil can be injected into the oil tank during maintenance of the electric tricycle. When lubricating oil is injected, the electric telescopic rod is in a retracted state, and the piston plate is located between the inlet of the oil tank and one side of the inner wall, also in a retracted state. During the use of the electric tricycle, the electric telescopic rod can be periodically started to drive the piston plate to one end, and then the lubricating oil inside the oil tank is squeezed into the guide pipe, and then sprayed out into the atomizing nozzle. At the same time, the motor is started to drive the atomizing nozzle to rotate back and forth in the inner wall of the bracket, so that the lubricating oil is evenly applied to the outer surface of the bevel gear ring block. Then, under the meshing rotation of the bevel gear ring block and the bevel gear, the lubricating oil can be evenly applied to the bevel gear for lubrication and maintenance. This slows down the aging and corrosion of the bevel gear and the outer surface of the bevel gear ring block, avoids damage, improves the meshing degree to ensure vehicle safety, and increases the service life of the vehicle. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a three-dimensional structural diagram of the rear axle body of this utility model;

[0024] Figure 3 This is a three-dimensional structural diagram of the mounting plate of this utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the fuel tank of this utility model;

[0026] Figure 5 for Figure 4 A three-dimensional schematic diagram of a local structure.

[0027] Markings: 1. Rear axle body; 2. Lubrication device; 3. Bevel gear ring block; 4. Bevel gear; 5. Transmission box; 6. Rear axle rod; 21. Mounting plate; 22. Oil tank; 23. Guide pipe; 24. Bracket; 25. Atomizing nozzle; 26. Motor; 27. Detachable mechanism; 271. First round hole block; 272. Second round hole block; 273. Locking rod; 274. Spring; 275. Connecting rod; 28. Electric telescopic rod; 29. ​​Piston plate; 210. Reinforcing rod; 211. Bearing; 212. Filter screen. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] In this embodiment:

[0032] Reference Figure 1 The diagram shows a preferred embodiment of the present invention.

[0033] This embodiment of an electric tricycle rear axle power transmission device includes a rear axle body 1, two rear axle rods 6, and a transmission box 5. The two rear axle rods 6 are respectively installed through the transmission box 5 and the two sides of the rear axle body 1. A bevel gear ring block 3 is fixedly installed on the outer surface of one end of the rear axle body 1. A bevel gear 4 is installed through one side of the inner wall of the transmission box 5, wherein the outer surface of the bevel gear 4 meshes with the outer surface of the bevel gear ring block 3. A lubrication device 2 is provided on one side of the transmission box 5. The lubrication device 2 can inject lubricating oil into the oil tank 22, and then push the lubricating oil in the oil tank 22 into the atomizing nozzle 25 through the piston plate 29 driven by the electric telescopic rod 28, and then spray it on the bevel gear ring block 3 and the bevel gear 4 to lubricate and maintain them, and slow down aging and corrosion. During the operation of the rear axle body 1 of the electric tricycle, the transmission box 5 is fixedly installed on the electric tricycle frame. Then, the output end of the motor is connected to the bevel gear 4 through a coupling. Starting the motor can drive the bevel gear 4 to rotate on the transmission box 5, which in turn drives the bevel gear ring block 3 fixed on the rear axle body 1 to rotate. This causes the rear axle body 1 and the rear axle rod 6 to rotate, thus driving the rear wheel of the electric tricycle. During use, the lubrication device 2 can be activated periodically to spray lubricating oil onto the bevel gear 4 and the bevel gear ring block 3. This slows down the aging and corrosion of the outer surface of the bevel gear 4 and the bevel gear ring block 3, prevents damage, improves meshing, ensures vehicle safety, and extends the service life of the vehicle.

[0034] Figure 1-5 The lubrication device 2 shown includes a mounting plate 21, one end of which is inserted into the inner wall of one side of the transmission box 5, and a detachable mechanism 27 is provided between one side of the mounting plate 21 and one side of the transmission box 5; an oil tank 22, one side of which is fixedly mounted on one side of the mounting plate 21; two brackets 24, one side of which is fixedly mounted on one side of the mounting plate 21; an atomizing nozzle 25, both ends of which are respectively installed through one side of the two brackets 24; and a motor 26, one side of which is fixedly mounted on one side of the mounting plate 21. The output end is fixedly mounted on one side of the atomizing nozzle 25 via a coupling; the guide tube 23, wherein one end of the guide tube 23 is mounted through one side of the mounting plate 21, and both ends are respectively mounted through one side of the atomizing nozzle 25 and one side of the oil tank 22; the piston plate 29, wherein the outer surface of the piston plate 29 is slidably connected to the inner wall of the oil tank 22; the electric telescopic rod 28, wherein one side of the electric telescopic rod 28 is fixedly mounted on one side of the inner wall of the oil tank 22, and the output end is fixedly mounted on one side of the piston plate 29. By setting up the lubrication device 2, lubricating oil can be injected into the oil tank 22 during the maintenance of the electric tricycle. When the lubricating oil is injected, the electric telescopic rod 28 is in a retracted state, and the piston plate 29 is located between the inlet of the oil tank 22 and one side of the inner wall, also in a retracted state. During the use of the electric tricycle, the electric telescopic rod 28 can be started periodically to drive the piston plate 29 to one end, and then the lubricating oil inside the oil tank 22 is squeezed into the guide pipe 23, and then sprayed out into the atomizing nozzle 25. At the same time, the motor 26 is started to drive the atomizing nozzle 25 to rotate back and forth in the inner wall of the bracket 24, so that the lubricating oil is evenly applied to the outer surface of the bevel gear ring block 3. Then, under the meshing rotation of the bevel gear ring block 3 and the bevel gear 4, the lubricating oil can be evenly applied to the bevel gear 4 for lubrication maintenance. This slows down the aging and corrosion of the outer surface of the bevel gear 4 and the bevel gear ring block 3, avoids damage, improves the meshing degree to ensure the safety of the vehicle, and increases the service life of the vehicle. It should be noted that the atomizing nozzle 25 is a mature technology and equipment in the existing technology, and its internal structure, connection method and principle will not be described further.

[0035] Figure 1-5A reinforcing rod 210 is symmetrically fixedly installed on the outer surface of the output end of the electric telescopic rod 28, with one side of the reinforcing rod 210 fixedly installed on one side of the piston plate 29. By setting the reinforcing rod 210, the connection area between the output end of the electric telescopic rod 28 and the piston plate 29 can be increased, making the connection more robust and stable, and less prone to breakage or damage. A bearing 211 is fixedly installed on the outer surface of one end of the guide tube 23, and the outer ring of the bearing 211 is fixedly installed on one side of the atomizing nozzle 25. By setting the bearing 211, the rotational wear between the guide tube 23 and the atomizing nozzle 25 can be reduced, improving the service life of both. The lubrication device 2 also includes several filters 212, the outer surface of which is fixedly installed in the inner wall of the outlet of the atomizing nozzle 25. By setting the filters 212, the inner wall of the outlet of the atomizing nozzle 25 can be protected, preventing external dust and impurities from entering the outlet of the atomizing nozzle 25 and avoiding blockage.

[0036] Figure 1-5 The detachable mechanism 27 shown includes several first circular hole blocks 271, one side of which is fixedly mounted on one side of the rotating box; several second circular hole blocks 272, one side of which is fixedly mounted on one side of the mounting plate 21; several locking rods 273, one end of which is inserted into the inner wall of the first circular hole blocks 271 and the second circular hole blocks 272; and several springs 274, the inner wall of which is sleeved on the outer surface of one end of the locking rod 273, and both ends are fixedly mounted on one side of the second circular hole block 272 and one side of the locking rod 273, respectively. By setting a detachable mechanism 27, before using the electric tricycle, the lever 273 can be pulled to one end in the inner wall of the second round hole block 272, causing the spring 274 to be stretched open. Then, one end of the mounting plate 21 is inserted into the inner wall of the transmission box 5. At this time, the lever 273 is released, and under the reset action of the spring 274, it can be inserted into the inner wall of the first round hole block 271, and the mounting plate 21 is fixedly installed on one side of the transmission box 5. The opposite operation can remove the mounting plate 21 and the oil tank 22 for easy replacement and maintenance.

[0037] Figure 1-5 The detachable mechanism 27 shown also includes two connecting rods 275, with both ends of the connecting rods 275 fixedly mounted on one side of two adjacent locking rods 273. By providing the connecting rods 275, when removal is needed, simply grasping and pulling the connecting rods 275 simultaneously pulls both locking rods 273 to one end, facilitating disassembly and reducing operational steps. One end of the mounting plate 21 has a trapezoidal longitudinal section, with the end of the mounting plate 21 furthest from the second circular hole block 272 being smaller than the other end. By setting one end of the mounting plate 21 in a trapezoidal shape, the area of ​​one end of the mounting plate 21 can be reduced, facilitating quick alignment with the inner wall of the transmission box 5 and insertion, thus simplifying installation.

[0038] Working principle: During the operation of the rear axle body 1 of the electric tricycle, the transmission box 5 is fixedly installed on the electric tricycle frame. Before using the electric tricycle, the locking rod 273 can be pulled to one end in the inner wall of the second round hole block 272, causing the spring 274 to be stretched open. Then, one end of the mounting plate 21 is inserted into the inner wall of the transmission box 5. At this time, the locking rod 273 is released, and under the reset action of the spring 274, it can be locked into the inner wall of the first round hole block 271, fixing the mounting plate 21 on one side of the transmission box 5. Conversely, the mounting plate 21 and the oil tank 22 can be removed for easy replacement and maintenance. Then, the output end of the motor is connected to the bevel gear 4 through a coupling. Starting the motor can drive the bevel gear 4 to rotate on the transmission box 5, thereby driving the bevel gear ring block 3 fixed on the rear axle body 1 to rotate, so that the rear axle body 1 and the rear axle rod 6 rotate to drive the rear wheel of the electric tricycle. During the maintenance of the electric tricycle, lubricating oil is injected into the oil tank 22. When the lubricating oil is injected, the electric telescopic rod 28 is in a retracted state, and the piston plate 29 is located between the inlet of the oil tank 22 and one side of the inner wall, also in a retracted state. Then, during the use of the electric tricycle, the electric telescopic rod 28 can be started periodically to drive the piston plate 29 to one end. Then, the lubricating oil inside the oil tank 22 is squeezed into the guide pipe 23 and then sprayed out into the atomizing nozzle 25. At the same time, the motor 26 is started to drive the atomizing nozzle 25 to rotate back and forth in the inner wall of the bracket 24, so that the lubricating oil is evenly applied to the outer surface of the bevel gear ring block 3. Then, under the meshing rotation of the bevel gear ring block 3 and the bevel gear 4, the lubricating oil can be evenly applied to the bevel gear 4 for lubrication maintenance. This slows down the aging and corrosion of the outer surface of the bevel gear 4 and the bevel gear ring block 3, avoids damage, improves the meshing degree to ensure the safety of the vehicle, and extends the service life of the vehicle.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power transmission device for the rear axle of an electric tricycle, comprising a rear axle body (1), two rear axle rods (6) and a transmission box (5), characterized in that: The two rear axle rods (6) are respectively installed through the transmission box (5) and the rear axle body (1) on both sides. A bevel gear ring block (3) is fixedly installed on the outer surface of one end of the rear axle body (1). A bevel gear (4) is installed through one side of the inner wall of the transmission box (5). The outer surface of the bevel gear (4) meshes with the outer surface of the bevel gear ring block (3). A lubrication device (2) is provided on one side of the transmission box (5). The lubrication device (2) can inject lubricating oil into the oil tank (22), and then drive the piston plate (29) through the electric telescopic rod (28) to push the lubricating oil in the oil tank (22) to the inside of the atomizing nozzle (25), and then spray it on the bevel gear ring block (3) and the bevel gear (4) to lubricate and maintain them, and slow down aging and corrosion.

2. The power transmission device for the rear axle of an electric tricycle according to claim 1, characterized in that: The lubrication device (2) includes a mounting plate (21), one end of which is inserted into the inner wall of one side of the transmission box (5), and a detachable mechanism (27) is provided between one side of the mounting plate (21) and one side of the transmission box (5). Fuel tank (22), wherein one side of fuel tank (22) is fixedly mounted on one side of mounting plate (21); Two brackets (24), one side of which is fixedly mounted on one side of the mounting plate (21); Atomizing nozzle (25), wherein the two ends of the atomizing nozzle (25) are respectively installed through one side of the two brackets (24); The motor (26) is fixedly mounted on one side of the bracket (24) and its output end is fixedly mounted on one side of the atomizing nozzle (25) by means of a coupling. The guide tube (23) has one end of its outer surface that is installed through one side of the mounting plate (21), and both ends are installed through one side of the atomizing nozzle (25) and one side of the oil tank (22), respectively. Piston plate (29), wherein the outer surface of piston plate (29) is slidably connected to the inner wall of oil tank (22); An electric telescopic rod (28) is provided, wherein one side of the electric telescopic rod (28) is fixedly installed on one side of the inner wall of the oil tank (22), and the output end is fixedly installed on one side of the piston plate (29).

3. The power transmission device for the rear axle of an electric tricycle according to claim 2, characterized in that: A reinforcing rod (210) is symmetrically fixedly installed on the outer surface of the output end of the electric telescopic rod (28), and one side of the reinforcing rod (210) is fixedly installed on one side of the piston plate (29).

4. The power transmission device for the rear axle of an electric tricycle according to claim 2, characterized in that: A bearing (211) is fixedly installed on the outer surface of one end of the guide tube (23), and the outer ring of the bearing (211) is fixedly installed on one side of the atomizing nozzle (25).

5. The power transmission device for the rear axle of an electric tricycle according to claim 2, characterized in that: The lubrication device (2) also includes several filters (212), wherein the outer surface of the filters (212) is fixedly installed in the inner wall of the outlet of the atomizing nozzle (25).

6. The power transmission device for the rear axle of an electric tricycle according to claim 2, characterized in that: The detachable mechanism (27) includes a plurality of first circular hole blocks (271), wherein one side of the first circular hole block (271) is fixedly installed on one side of the rotating box; Several second circular hole blocks (272), wherein one side of the second circular hole block (272) is fixedly mounted on one side of the mounting plate (21); Several locking rods (273), one end of which is inserted into the inner wall of the first circular hole block (271) and the second circular hole block (272); Several springs (274) are provided, wherein the inner wall of the springs (274) is sleeved on the outer surface of one end of the clamping rod (273), and the two ends are respectively fixedly installed on one side of the second round hole block (272) and one side of the clamping rod (273).

7. The power transmission device for the rear axle of an electric tricycle according to claim 6, characterized in that: The detachable mechanism (27) also includes two connecting rods (275), wherein the two ends of the connecting rods (275) are respectively fixedly installed on one side of two adjacent locking rods (273).

8. The power transmission device for the rear axle of an electric tricycle according to claim 6, characterized in that: The longitudinal section of one end of the mounting plate (21) is trapezoidal, and the dimension of the end of the mounting plate (21) away from the second circular hole block (272) is smaller than that of the other end.

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