Stable truck for removing periphytic algae on side slope of channel

Abstract

The invention discloses a stable truck for removing periphytic algae on a channel slope. A left supporting wheel is rotationally connected to the left end of a supporting wheel shaft through a left supporting bearing, a right supporting wheel is rotationally connected to the right end of the supporting wheel shaft through a right supporting bearing, and the top end of a supporting telescopic oil cylinder is arranged below an auxiliary beam of an automobile chassis; the top ends of the first supporting assembly and the second supporting assembly are arranged below an auxiliary beam of an automobile chassis, the first supporting assembly is hinged to the front portion of the supporting bottom plate through the first lug plate assembly, the bottom of the first supporting assembly is hinged to the supporting bottom plate front and back along a hinge point, and the second supporting assembly is hinged to the rear portion of the supporting chassis through the second lug plate assembly. The bottom of the second supporting assembly is hinged to the supporting bottom plate left and right along hinge points. The stable truck is high in stability, the cleaning efficiency of the cleaning operation is improved, the safety of the cleaning operation is guaranteed, and the technical problems that an existing engineering truck is short in service life and low in stability, and consequently the cleaning operation efficiency is low are effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment auxiliary equipment, and in particular relates to a stable load-carrying vehicle for removing algae grown on channel slopes. Background Art

[0002] In the prior art, in order to prevent a vehicle from rolling over, auxiliary support wheels are usually arranged under the vehicle body to improve the stability of the vehicle. However, most auxiliary support wheels currently require a large space when turning upside down, and when there are other components interfering around the underside of the vehicle chassis, the auxiliary support wheels are difficult to work normally.

[0003] When the vehicle is in operation, the chassis tilts sideways, causing the frame to deform. The tires support all the weight of the vehicle. The tilt of the vehicle will cause uneven force on the tires, causing the tires to deform or wear differently. Long-term operation reduces the service life of the frame and tires. The deformation of the vehicle chassis will affect the rigidity and stability of the vehicle structure, and may cause the vehicle to shake while driving, affecting the stability of the vehicle. In the prior art, in order to prevent the vehicle from rolling over, auxiliary support wheels are usually set under the vehicle body to improve the stability of the vehicle. However, most of the auxiliary support wheels currently require a large space when flipping up and down. When there are other components interfering around the bottom of the vehicle chassis, the auxiliary support wheels are difficult to work normally.

[0004] In the technology of removing algae growing on slopes at home and abroad, ordinary engineering vehicles are mostly used as load-carrying vehicles. However, since it is necessary to extend the mechanical arm for the removal operation, the chassis of the vehicle tilts during the operation, causing the frame to deform. The tires support all the gravity of the vehicle. The tilt of the vehicle will cause uneven force on the tires, causing the tires to deform or wear differently. Long-term operation will reduce the service life of the frame and tires. During operation, the engineering vehicle is unstable due to the need to operate with a mechanical arm. The deformation of the chassis will affect the rigidity and stability of the body structure, which may cause the vehicle to shake while driving, affecting the stability of the vehicle. Therefore, there is a need for a stable load-carrying vehicle for removing algae growing on channel slopes that has high stability and is conducive to improving the efficiency of the removal operation. Summary of the invention

[0005] The object of the present invention is to provide a stable load-carrying vehicle for removing algae grown on the channel slope, which has high stability and is conducive to improving the efficiency of the removal operation.

[0006] To achieve the above object, the present invention adopts the following technical solution: A stable load-carrying vehicle for removing algae grown on the channel slope comprises an engineering vehicle, a manipulator device is installed on the engineering vehicle, a walking assistance device is installed on the working side of the vehicle chassis of the engineering vehicle adjacent to the channel, the walking assistance device comprises a left support wheel, a right support wheel, a support wheel shaft, a support base, a support telescopic oil cylinder, a first support assembly, and a second support assembly, the left support wheel is rotatably connected to the left end of the support wheel shaft through a left support bearing, the right support wheel is rotatably connected to the right end of the support wheel shaft through a right support bearing, the support base is arranged in the middle part of the support wheel shaft, the bottom of the support telescopic oil cylinder is vertically connected to the support base, and the top of the support telescopic oil cylinder is arranged below the sub-beam of the vehicle chassis; the tops of the first support assembly and the second support assembly are both arranged below the sub-beam of the vehicle chassis and are respectively located at the front and rear sides of the support telescopic oil cylinder, the first support assembly is hinged to the front of the support bottom plate through the first ear plate assembly, the bottom of the first support assembly is hinged to the support bottom plate front and rear along the hinge point, the second support assembly is hinged to the rear of the support chassis through the second ear plate assembly, and the bottom of the second support assembly is hinged to the support bottom plate left and right along the hinge point.

[0007] The first support assembly includes a first outer support rod, a first inner support rod, a first ear plate seat, a first pin shaft, a second pin shaft and a third pin shaft, the top end of the first outer support rod is hinged to the first ear plate seat, the first ear plate seat includes a first top plate, a first front ear plate and a first rear ear plate, the top end of the first outer support rod is provided with a first connecting through hole along the front-to-back direction, the first outer support rod is provided with a plurality of first adjusting outer holes along the length direction, the first inner support rod is slidably arranged inside the first outer support rod, the bottom of the first inner support rod is hinged to the first ear plate assembly, the first inner support rod is provided with a plurality of first adjusting inner holes along the length direction, the first adjusting outer holes and the first adjusting inner holes correspond one to one, the first pin shaft passes through the first front ear plate, the first rear ear plate, the first connecting through hole, and the second pin shaft passes through the first adjusting outer hole and the first adjusting inner hole.

[0008] The first ear plate assembly includes a first front hinge plate and a first rear hinge plate, a first hinge through hole is arranged at the bottom end of the first inner support rod along the front-to-back direction, and the third pin shaft passes through the first front hinge plate, the first hinge through hole and the first rear hinge plate; the second ear plate assembly includes a second left hinge plate and a second right hinge plate, a second hinge through hole is arranged at the bottom end of the second inner support rod along the front-to-back direction, and the sixth pin shaft passes through the second left hinge plate, the second hinge through hole and the second right hinge plate.

[0009] The manipulator device includes an arm assembly, a slewing drive mechanism and a base. The base is fixed to the automobile chassis by bolts. The slewing drive mechanism is arranged on the base. The arm assembly is transmission-connected to the slewing drive mechanism. The arm assembly includes a base arm, a second telescopic arm, a third telescopic arm, a trolley connecting arm, and an arm head connecting frame. The second telescopic arm is slidably connected to the inside of the base arm, and the third telescopic arm is slidably connected to the inside of the second telescopic arm. The upper end of the trolley connecting arm is connected to the end of the third telescopic arm through the arm head connecting frame, and the lower end of the trolley connecting arm is hinged to a clearing device. A connecting bracket is provided at the head end of the base arm. The connecting bracket is hinged to the slewing drive mechanism, and a connecting plate is provided on the side of the connecting bracket.

[0010] A fixed bracket is arranged at the end of the base arm, a push-pull bracket is arranged at the end of the second telescopic arm, the end of the third telescopic arm is connected to the arm head connecting frame, a first telescopic oil cylinder is arranged between the fixed bracket and the push-pull bracket, a cylinder head end of the first telescopic oil cylinder is hinged to the fixed bracket, a cylinder body end of the first telescopic oil cylinder is hinged to the push-pull bracket, a second telescopic oil cylinder is arranged between the push-pull bracket and the arm head connecting frame, a cylinder head end of the second telescopic oil cylinder is hinged to the push-pull bracket, and a cylinder body end of the second telescopic oil cylinder is hinged to the arm head connecting frame.

[0011] The slewing drive mechanism includes a main connecting arm, a main arm cylinder and a telescopic arm cylinder. The upper end of the main connecting arm is hingedly connected to the bracket, the lower end of the main connecting arm is hingedly connected to the base, the upper end of the main arm cylinder is hingedly connected to the upper end of the main connecting arm, the lower end of the main arm cylinder is hingedly connected to the bracket, the upper end of the telescopic arm cylinder is hingedly connected to the bracket, and the lower end of the telescopic arm cylinder is hingedly connected to the lower end of the main connecting arm.

[0012] The arm head connecting frame includes a front splint, a rear splint, an intermediate plate, a bottom connecting plate, a guide shaft, a compression spring, a front connecting plate, and a rear connecting plate. The front splint and the rear splint are relatively arranged on both sides of the end of the third telescopic arm, the front end of the intermediate plate is connected to the front splint, and the rear end of the intermediate plate is connected to the rear splint. The front connecting plate and the rear connecting plate are relatively arranged on both sides of the upper end of the trolley connecting arm, the front end of the bottom connecting plate is connected to the front connecting plate, and the rear end of the bottom connecting plate is connected to the rear connecting plate. A first long hole is opened on the intermediate plate, and a second long hole corresponding to the first long hole is opened on the bottom connecting plate. The guide shaft passes through the first long hole and the second long hole in sequence, and the compression spring is sleeved on the guide shaft. An outer circular portion is arranged on the upper end of the guide shaft, and the outer circular portion is supported on the upper surface of the first long hole. An adjusting nut is arranged on the lower end of the guide shaft, and the adjusting nut is supported on the lower surface of the second long hole.

[0013] The walking assist device of the present application is fixed under the chassis beam of the vehicle, and the supporting wheels can be synchronously extended and retracted to meet the requirements of different road conditions when the vehicle is walking; the walking assist device is flexible in extension and retraction, has high operating efficiency, and has good stability and safety. It can reduce the wear on the vehicle tires and avoid deformation of the chassis frame of the vehicle.

[0014] In summary, the stable truck of the present invention has high stability, which is beneficial to improving the cleaning efficiency of the cleaning operation, ensuring the safety of the cleaning operation, and effectively solving the technical problems of low cleaning efficiency caused by low service life and low stability of existing engineering vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a three-dimensional schematic diagram of the manipulator device of the present invention.

[0017] Figure 3 It is a side view of the manipulator device of the present invention.

[0018] Figure 4 It is a three-dimensional schematic diagram of the walking assist device of the present invention.

[0019] Figure 5 It is a side view of the walking assist device of the present invention.

[0020] Figure 6 yes Figure 5 Sectional view along line AA. DETAILED DESCRIPTION

[0021] like Figure 1-6 As shown, a stable truck for removing algae grown on the channel slope comprises an engineering vehicle 1, on which a manipulator device 4 is installed, and a walking assist device 2 is installed on the working side of the vehicle chassis of the engineering vehicle 1 adjacent to the channel, the manipulator device 4 comprises an arm assembly 21, a rotary drive mechanism 22 and a base, the base is fixed to the vehicle chassis by bolts, the rotary drive mechanism 22 is arranged on the base, the arm assembly 21 is transmission-connected to the rotary drive mechanism 22, the arm assembly 21 comprises a base arm 23, a second telescopic arm 24, a third telescopic arm 25, a trolley connecting arm 26, and an arm head connecting frame 27, the second telescopic arm 24 is slidably connected to the inside of the base arm 23, the third telescopic arm 25 is slidably connected to the inside of the second telescopic arm 24, the upper end of the trolley connecting arm 26 is connected to the end of the third telescopic arm 25 through the arm head connecting frame 27, the lower end of the trolley connecting arm 26 is hinged to the cleaning device, the head end of the base arm 23 is provided with a connecting bracket, the connecting bracket is hinged to the rotary drive mechanism 22, and the side of the connecting bracket is provided with a connecting plate; A fixed bracket is provided at the end of the base arm 23, a push-pull bracket is provided at the end of the second telescopic arm 24, the end of the third telescopic arm 25 is connected to the arm head connecting frame 27, a first telescopic oil cylinder is provided between the fixed bracket and the push-pull bracket, the cylinder head end of the first telescopic oil cylinder is hinged to the fixed bracket, the cylinder end of the first telescopic oil cylinder is hinged to the push-pull bracket, a second telescopic oil cylinder is provided between the push-pull bracket and the arm head connecting frame 27, the cylinder head end of the second telescopic oil cylinder is hinged to the push-pull bracket, and the cylinder end of the second telescopic oil cylinder is hinged to the arm head connecting frame 27; The slewing drive mechanism 22 includes a main connecting arm 28, a main arm oil cylinder 29 and a telescopic arm oil cylinder 30. The upper end of the main connecting arm 28 is hingedly connected to the bracket, and the lower end of the main connecting arm is hingedly connected to the base. The upper end of the main arm oil cylinder 29 is hingedly connected to the upper end of the main connecting arm 28, and the lower end of the main arm oil cylinder 29 is hingedly connected to the bracket. The upper end of the telescopic arm oil cylinder 30 is hingedly connected to the bracket, and the lower end of the telescopic arm oil cylinder 30 is hingedly connected to the lower end of the main connecting arm 28. The arm head connecting frame 27 includes a front splint, a rear splint, an intermediate plate, a bottom connecting plate, a guide shaft, a compression spring, a front connecting plate, and a rear connecting plate. The front splint and the rear splint are relatively arranged on both sides of the end of the third telescopic arm 25, the front end of the intermediate plate is connected to the front splint, and the rear end of the intermediate plate is connected to the rear splint. The front connecting plate and the rear connecting plate are relatively arranged on both sides of the upper end of the trolley connecting arm 26, the front end of the bottom connecting plate is connected to the front connecting plate, and the rear end of the bottom connecting plate is connected to the rear connecting plate. A first long hole is opened on the intermediate plate, and a second long hole corresponding to the first long hole is opened on the bottom connecting plate. The guide shaft passes through the first long hole and the second long hole in sequence. The compression spring is sleeved on the guide shaft, and an outer circular portion is arranged on the upper end of the guide shaft, and the outer circular portion is supported on the upper surface of the first long hole. An adjusting nut is arranged on the lower end of the guide shaft, and the adjusting nut is supported on the lower surface of the second long hole.

[0022] The walking assist device 2 includes a left support wheel 44, a right support wheel 45, a support wheel axle, a support base 46, a support telescopic oil cylinder 47, a first support assembly 48, and a second support assembly 49. The left support wheel 44 is rotatably connected to the left end of the support wheel axle through a left support bearing, and the right support wheel 45 is rotatably connected to the right end of the support wheel axle through a right support bearing. The support base 46 is arranged in the middle part of the support wheel axle, the bottom of the support telescopic oil cylinder 47 is vertically connected to the support base 46, and the top of the support telescopic oil cylinder 47 is arranged below the sub-beam of the automobile chassis; the tops of the first support assembly 48 and the second support assembly 49 are both arranged below the sub-beam of the automobile chassis and are respectively located at the front and rear sides of the support telescopic oil cylinder 47, the first support assembly 48 is hinged to the front of the support base plate through the first ear plate assembly, the bottom of the first support assembly 48 is hinged to the support base plate along the hinge point front and rear, the second support assembly 49 is hinged to the rear of the chassis through the second ear plate assembly, and the bottom of the second support assembly 49 is hinged to the support base plate left and right along the hinge point; The first support assembly 48 includes a first outer support rod, a first inner support rod, a first ear plate seat, a first pin shaft, a second pin shaft and a third pin shaft. The top end of the first outer support rod is hinged to the first ear plate seat. The first ear plate seat includes a first top plate, a first front ear plate and a first rear ear plate. The top end of the first outer support rod is provided with a first connecting through hole along the front-to-back direction. The first outer support rod is provided with a plurality of first adjusting outer holes along the length direction. The first inner support rod is slidably arranged inside the first outer support rod. The bottom of the first inner support rod is hinged to the first ear plate assembly. The first inner support rod is provided with a plurality of first adjusting inner holes along the length direction. The first adjusting outer holes and the first adjusting inner holes correspond to each other one by one. The first pin shaft passes through the first front ear plate, the first rear ear plate and the first connecting through hole. The second pin shaft passes through the first adjusting outer hole and the first adjusting inner hole.

[0023] The second support assembly 49 includes a second outer support rod, a second inner support rod, a second ear plate seat, a fourth pin shaft, a fifth pin shaft and a sixth pin shaft, the top end of the second outer support rod is hinged to the second ear plate seat, the second ear plate seat includes a second top plate, a second left ear plate and a second right ear plate, the top end of the second outer support rod is provided with a second connecting through hole along the left-right direction, the second outer support rod is provided with a plurality of second adjusting outer holes along the length direction, the second inner support rod is slidably provided inside the second outer support rod, the bottom of the second inner support rod is hinged to the second ear plate assembly, the second inner support rod is provided with a plurality of second adjusting inner holes along the length direction, the second adjusting outer holes and the second adjusting inner holes correspond one to one, the fourth pin shaft passes through the second left ear plate, the second right ear plate and the second connecting through hole, and the fifth pin shaft passes through the second adjusting outer hole and the second adjusting inner hole; The first ear plate assembly includes a first front hinge plate and a first rear hinge plate, the bottom end of the first inner support rod is provided with a first hinge through hole along the front-back direction, and the third pin passes through the first front hinge plate, the first hinge through hole and the first rear hinge plate; the second ear plate assembly includes a second left hinge plate and a second right hinge plate, the bottom end of the second inner support rod is provided with a second hinge through hole along the front-back direction, and the sixth pin passes through the second left hinge plate, the second hinge through hole and the second right hinge plate. The left and right support wheels adopt a set of solid tires, and the rubber material is wear-resistant, pressure-resistant, has a long service life and is stable in driving. The inner and outer support rods adopt carbon alloy steel square tubes, which are light in weight, rigid and high in strength. When the inner support rod is extended and retracted, the outer support rod plays a guiding role. Both ends of the inner and outer support rods are hinged. Synchronous extension and retraction are achieved when the oil cylinder is extended and retracted. The support base 46 adopts an inverted trapezoidal structure, so that it can bear a large load and has the best supporting effect during use, which can reduce the squeezing of the ground by the tires and reduce the possibility of ground subsidence.

[0024] The walking assist device 2 of the present application is fixed under the chassis beam of the vehicle and is arranged on the working side of the adjacent channel of the chassis of the vehicle. The support wheels can be synchronously extended and retracted to meet the requirements of different road conditions when the vehicle is walking; the walking assist device 2 is flexible in extension and retraction, has high operating efficiency, and has good stability and safety. It can reduce the wear on the vehicle tires and avoid deformation of the chassis frame of the vehicle. In the process of removing algae, the engineering vehicle is unstable due to the need to control the movement of the removal trolley through the manipulator device 4, which poses a great safety hazard. The walking assist device of the present application makes the engineering vehicle stable and ensures the safety of the algae removal operation.

[0025] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A stable load-carrying vehicle for removing algae from channel slopes, characterized by: The utility model comprises an engineering vehicle, on which a manipulator device is installed, and a walking assistance device is installed on the working side of the adjacent channel of the automobile chassis of the engineering vehicle, and the walking assistance device comprises a left supporting wheel, a right supporting wheel, a supporting wheel shaft, a supporting base, a supporting telescopic oil cylinder, a first supporting assembly, and a second supporting assembly. The left supporting wheel is rotatably connected to the left end of the supporting wheel shaft through a left supporting bearing, and the right supporting wheel is rotatably connected to the right end of the supporting wheel shaft through a right supporting bearing. The supporting base is arranged in the middle part of the supporting wheel shaft, the bottom of the supporting telescopic oil cylinder is vertically connected to the supporting base, and the top of the supporting telescopic oil cylinder is arranged below the sub-beam of the automobile chassis; the tops of the first supporting assembly and the second supporting assembly are both arranged below the sub-beam of the automobile chassis and are respectively located at the front and rear sides of the supporting telescopic oil cylinder, the first supporting assembly is hinged to the front of the supporting bottom plate through the first ear plate assembly, the bottom of the first supporting assembly is hinged to the supporting bottom plate front and rear along the hinge point, the second supporting assembly is hinged to the rear of the supporting chassis through the second ear plate assembly, and the bottom of the second supporting assembly is hinged to the supporting bottom plate left and right along the hinge point.

2. The stable load-carrying vehicle for removing algae growing on the channel slope according to claim 1 is characterized in that: The first support assembly includes a first outer support rod, a first inner support rod, a first ear plate seat, a first pin shaft, a second pin shaft and a third pin shaft, the top end of the first outer support rod is hinged to the first ear plate seat, the first ear plate seat includes a first top plate, a first front ear plate and a first rear ear plate, the top end of the first outer support rod is provided with a first connecting through hole along the front-to-back direction, the first outer support rod is provided with a plurality of first adjusting outer holes along the length direction, the first inner support rod is slidably arranged inside the first outer support rod, the bottom of the first inner support rod is hinged to the first ear plate assembly, the first inner support rod is provided with a plurality of first adjusting inner holes along the length direction, the first adjusting outer holes and the first adjusting inner holes correspond one to one, the first pin shaft passes through the first front ear plate, the first rear ear plate, the first connecting through hole, and the second pin shaft passes through the first adjusting outer hole and the first adjusting inner hole.

3. The stable load-carrying vehicle for removing algae growing on the channel slope according to claim 2, characterized in that: The first ear plate assembly includes a first front hinge plate and a first rear hinge plate, a first hinge through hole is arranged at the bottom end of the first inner support rod along the front-to-back direction, and the third pin shaft passes through the first front hinge plate, the first hinge through hole and the first rear hinge plate; the second ear plate assembly includes a second left hinge plate and a second right hinge plate, a second hinge through hole is arranged at the bottom end of the second inner support rod along the front-to-back direction, and the sixth pin shaft passes through the second left hinge plate, the second hinge through hole and the second right hinge plate.

4. The stable load-carrying vehicle for removing algae growing on channel slopes according to claim 3 is characterized in that: The manipulator device includes an arm assembly, a slewing drive mechanism and a base. The base is fixed to the automobile chassis by bolts. The slewing drive mechanism is arranged on the base. The arm assembly is transmission-connected to the slewing drive mechanism. The arm assembly includes a base arm, a second telescopic arm, a third telescopic arm, a trolley connecting arm, and an arm head connecting frame. The second telescopic arm is slidably connected to the inside of the base arm, and the third telescopic arm is slidably connected to the inside of the second telescopic arm. The upper end of the trolley connecting arm is connected to the end of the third telescopic arm through the arm head connecting frame, and the lower end of the trolley connecting arm is hinged to a clearing device. A connecting bracket is provided at the head end of the base arm. The connecting bracket is hinged to the slewing drive mechanism, and a connecting plate is provided on the side of the connecting bracket.

5. The stable load-carrying vehicle for removing algae growing on the channel slope according to claim 4, characterized in that: A fixed bracket is arranged at the end of the base arm, a push-pull bracket is arranged at the end of the second telescopic arm, the end of the third telescopic arm is connected to the arm head connecting frame, a first telescopic oil cylinder is arranged between the fixed bracket and the push-pull bracket, a cylinder head end of the first telescopic oil cylinder is hinged to the fixed bracket, a cylinder body end of the first telescopic oil cylinder is hinged to the push-pull bracket, a second telescopic oil cylinder is arranged between the push-pull bracket and the arm head connecting frame, a cylinder head end of the second telescopic oil cylinder is hinged to the push-pull bracket, and a cylinder body end of the second telescopic oil cylinder is hinged to the arm head connecting frame.

6. The stable load-carrying vehicle for removing algae growing on the channel slope according to claim 5, characterized in that: The slewing drive mechanism includes a main connecting arm, a main arm cylinder and a telescopic arm cylinder. The upper end of the main connecting arm is hingedly connected to the bracket, the lower end of the main connecting arm is hingedly connected to the base, the upper end of the main arm cylinder is hingedly connected to the upper end of the main connecting arm, the lower end of the main arm cylinder is hingedly connected to the bracket, the upper end of the telescopic arm cylinder is hingedly connected to the bracket, and the lower end of the telescopic arm cylinder is hingedly connected to the lower end of the main connecting arm.

7. The stable load-carrying vehicle for removing algae growing on the channel slope according to claim 6, characterized in that: The arm head connecting frame includes a front splint, a rear splint, an intermediate plate, a bottom connecting plate, a guide shaft, a compression spring, a front connecting plate, and a rear connecting plate. The front splint and the rear splint are relatively arranged on both sides of the end of the third telescopic arm, the front end of the intermediate plate is connected to the front splint, and the rear end of the intermediate plate is connected to the rear splint. The front connecting plate and the rear connecting plate are relatively arranged on both sides of the upper end of the trolley connecting arm, the front end of the bottom connecting plate is connected to the front connecting plate, and the rear end of the bottom connecting plate is connected to the rear connecting plate. A first long hole is opened on the intermediate plate, and a second long hole corresponding to the first long hole is opened on the bottom connecting plate. The guide shaft passes through the first long hole and the second long hole in sequence, and the compression spring is sleeved on the guide shaft. An outer circular portion is arranged on the upper end of the guide shaft, and the outer circular portion is supported on the upper surface of the first long hole. An adjusting nut is arranged on the lower end of the guide shaft, and the adjusting nut is supported on the lower surface of the second long hole.

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