A drone for power line inspection

Abstract

The present invention relates to the technical field of unmanned aerial vehicles for power grid line inspection, and discloses an unmanned aerial vehicle for power grid line inspection, including an unmanned aerial vehicle body, support rods are arranged on the left and right side walls of the bottom of the unmanned aerial vehicle body, support mechanisms are arranged at the bottoms of the two support rods, the two support rods can be adaptively swung to perform landing buffering, and the two support mechanisms can perform buffering landing with the ground. The unmanned aerial vehicle for power grid line inspection, the present invention provides a balancing mechanism between the two support rods and the bottom walls on both sides of the unmanned aerial vehicle body, so that when the unmanned aerial vehicle body lands, the support rods can adaptively squeeze with the hard objects on the bottom surface, so that the support rods can be flipped and offset at a certain slight angle, thereby ensuring the stability and stability of the unmanned aerial vehicle body when landing, and solving the problem of tilting and tilting of the unmanned aerial vehicle body when landing.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles for power grid line inspection, and in particular to an unmanned aerial vehicle for power grid line inspection. Background Art

[0002] As the name implies, drones for power line inspection are used for intelligent inspection of power grids. The existing power line inspection drones are generally equipped with infrared thermal imaging, ultraviolet devices, etc., for intelligent inspection, which can largely replace traditional manual inspections and have high work efficiency. However, when the existing power line inspection drones are used, since the landing place is random, the staff needs to inspect the control area on site, which may cause the drone to encounter potholes or collisions with hard objects when landing. Although the existing technology has a cushion at the bottom of the drone, it still cannot guarantee the landing safety of the drone, which is prone to damage and other problems.

[0003] To this end, we propose a drone for power grid line inspection. Summary of the invention

[0004] The present invention mainly solves the technical problems existing in the above-mentioned prior art and provides a drone for power grid line inspection.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a drone for power grid line inspection, including a drone body, support rods are arranged on the left and right side walls of the bottom of the drone body, the two support rods are in an outward-facing shape, and support mechanisms are arranged at the bottom of the two support rods. A camera device is also arranged at the center position of the bottom of the drone body, and a balancing mechanism is arranged between the two support rods and the bottom walls on both sides of the drone body. The two support rods can adaptively swing to cushion the landing, and the two support mechanisms can cushion the landing with the ground.

[0006] Preferably, the balancing mechanism includes a rotating column fixedly connected to the corresponding support rod, and a rotating groove is opened in the bottom wall surfaces on the left and right sides of the inspection drone body, the rotating column is located in the rotating groove and the rotating column can rotate in the rotating groove, and a vertically upward center positioning plate is fixedly installed at the top center position of the rotating column, an arc-shaped slide groove is opened in the top wall surface of the rotating groove, and the center positioning plate is engaged in the arc-shaped slide groove, and a balancing spring is connected between the center positioning plate and the two side walls of the arc-shaped slide groove, and a limiting arc plate is also connected to the top of the center positioning plate, and an arc-shaped limit groove for engaging the limit arc plate is opened on the inner wall of the arc-shaped slide groove.

[0007] Preferably, the support mechanism is a cylinder, the two support mechanisms are fixedly connected to the corresponding support rods respectively, and the connection position between the support rods and the support mechanism is located at the center position of the support mechanism.

[0008] Preferably, evenly distributed support claws are fixedly mounted on the left and right outer walls of the two support mechanisms, and the support claws on both sides of each support mechanism are symmetrically distributed in an outward-facing "X" shape.

[0009] Preferably, the support mechanism is a buffer base plate fixedly connected to the support rod, the buffer base plate is a half cylinder, the arc surface of the buffer base plate is fixedly connected to the corresponding support rod, and the diameter section end of the buffer base plate is in horizontal contact with the ground.

[0010] Preferably, a buffer base is further provided at the bottom of the two buffer bottom plates, and evenly distributed buffer rods are provided at the bottom of the buffer base, and the buffer rods are movably mounted on the bottom wall of the buffer base.

[0011] Preferably, the buffer base is a rectangular body, the buffer base is fixedly connected to the buffer bottom plate, the buffer rod is a cylinder, a piston is fixedly installed on the top of the buffer rod, a buffer groove is opened in the bottom wall of the buffer base and is engaged with the piston up and down, the buffer rod movably passes through the bottom wall of the buffer groove, and the bottom end of the buffer rod is in contact with the bottom surface.

[0012] Preferably, the support mechanism is composed of a plurality of groups of adjacent balancing blocks, a guide sleeve is provided between two adjacent balancing blocks, the balancing blocks are cylindrical, the material of the balancing blocks is rubber, and the balancing blocks can move up and down for buffering.

[0013] Preferably, the center position of one side wall of the balancing block is fixedly connected to the guide sleeve, and a limiting groove is provided on the other side wall of the balancing block, a vertical guide rod is fixedly installed in the limiting groove, a through groove is provided on the other end of the guide sleeve, and the guide sleeve is movably installed together with the guide rod through the through groove, and buffer springs are inserted into the upper and lower outer walls of the guide rod, and the buffer springs are located on the upper and lower sides of the guide sleeve.

[0014] Preferably, a soft pad is fixedly mounted on the bottom of each of the balancing blocks, and the soft pad is wavy in shape.

[0015] Beneficial Effects

[0016] The present invention provides a drone for power grid line inspection, which has the following beneficial effects:

[0017] (1) The invention provides a power grid line inspection drone with a balancing mechanism between two support rods and the bottom walls on both sides of the drone body. When the drone body is landing, the support rods can adaptively squeeze against hard objects on the bottom surface, so that the support rods can flip and deflect at a certain slight angle, thereby ensuring the stability and stability of the drone body when landing, and solving the problem of the drone body tilting and falling when landing.

[0018] (2) In the power grid line inspection drone of the present invention, the supporting mechanism is a cylindrical rubber, which can achieve a certain buffering effect. At the same time, the cylindrical rubber of the supporting mechanism can be hollow to reduce the overall mass. At the same time, a supporting claw is provided, which can further ensure the stability of the supporting mechanism when landing, thereby improving the landing stability and safety of the inspection drone body of the present invention.

[0019] (3) In the power grid line inspection drone, the support mechanism of the present invention is a buffer bottom plate fixedly connected to the support rod. The buffer bottom plate is a half cylinder. The arc surface of the buffer bottom plate is fixedly connected to the corresponding support rod. The diameter cross-sectional end of the buffer bottom plate is in horizontal contact with the ground. The material of the buffer bottom plate is rubber. The buffer bottom plate can serve the purpose of buffering the entire landing of the inspection drone body. At the same time, the cross-sectional end of the buffer bottom plate can increase the contact area with the bottom surface, thereby improving the landing stability and safety of the inspection drone body of the present invention.

[0020] (4) In the power grid line inspection drone, a buffer base is further provided at the bottom of the buffer bottom plate of the present invention, and buffer rods evenly distributed are provided at the bottom of the buffer base. The buffer rods are movably mounted on the bottom wall of the buffer base. When the inspection drone body is landing, the buffer rods are in direct contact with the bottom surface, so that the buffer rods can achieve the purpose of air buffering. The buffer rods are compressed so that the piston moves in the buffer groove, thereby achieving the purpose of multiple buffering landing.

[0021] (5) The support mechanism of the power grid line inspection drone of the present invention is composed of multiple groups of adjacent balancing blocks, and a guide sleeve is arranged between two adjacent balancing blocks. The balancing blocks are cylindrical and made of rubber. The balancing blocks can move up and down for buffering. When the bottom surface of the inspection drone body is uneven, the balancing blocks can realize adaptive buffering. The bottom end of the hard object can make the balancing blocks move downward, and the bottom end of the pothole can make the balancing blocks move downward, thereby ensuring the contact area with the bottom surface and improving the landing stability and safety of the inspection drone body of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for the implementation or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0024] Figure 1 It is a stereogram of the present invention;

[0025] Figure 2 It is a partial cross-sectional view of the present invention;

[0026] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 It is a partial cross-sectional view of the second embodiment of the present invention;

[0028] Figure 5 It is a cross-sectional view of three parts of an embodiment of the present invention;

[0029] Figure 6 It is a cross-sectional view of four parts of an embodiment of the present invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle;

[0031] Figure 8 It is a partial cross-sectional view of embodiment 5 of the present invention.

[0032] Legend:

[0033] 10. Inspection UAV body; 11. Support rod; 12. Support mechanism; 13. Rotating column; 14. Rotating slot; 15. Center positioning plate; 16. Arc slide slot; 17. Balance spring; 18. Support claw; 20. Balance mechanism; 30. Buffer bottom plate; 31. Buffer base; 32. Buffer rod; 33. Piston; 34. Buffer slot; 40. Balance block; 41. Guide sleeve; 42. Cushion; 43. Through slot; 44. Limit slot; 45. Guide rod; 46. Buffer spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments 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.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] Embodiment 1: A drone for power line inspection, such as Figure 1 , Figure 2 , Figure 3 As shown, it includes an inspection drone body 10. The inspection drone body 10 is a prior art and will not be described in detail here. Support rods 11 are arranged on the left and right side walls of the bottom of the inspection drone body 10. The two support rods 11 are in an outward-facing shape. Support mechanisms 12 are arranged at the bottom of the two support rods 11. A camera device is also arranged at the center of the bottom of the inspection drone body 10. Balance mechanisms 20 are arranged between the two support rods 11 and the bottom walls on both sides of the inspection drone body 10. The two support rods 11 can adaptively swing to cushion the landing, and the two support mechanisms 12 can cushion the landing with the ground.

[0042] The balancing mechanism 20 includes a rotating column 13 fixedly connected to the corresponding support rod 11, the rotating column 13 is a hemispherical body, and a rotating groove 14 is provided in the bottom wall surfaces on the left and right sides of the inspection drone body 10, and the rotating groove 14 is hemispherical. The rotating column 13 is located in the rotating groove 14 and the rotating column 13 can rotate in the rotating groove 14. A vertically upward center positioning plate 15 is fixedly installed at the top center position of the rotating column 13, and an arc-shaped slide groove 16 is provided in the top wall surface of the rotating groove 14. The center positioning plate 15 is engaged in the arc-shaped slide groove 16. Balance springs 17 are connected between the center positioning plate 15 and the two side walls of the arc-shaped slide groove 16. The two balance springs 17 are in a symmetrical state. A limited arc plate is also connected to the top of the center positioning plate 15. An arc-shaped limiting groove for engaging the limiting arc plate is provided on the inner wall of the arc-shaped slide groove 16. By embedding the limiting arc plate into the limiting limiting groove, a sliding connection is formed to ensure that the rotating column 13 and the rotating groove 14 will not be separated.

[0043] The inspection drone body 10 of the present invention is combined with a real-time information collection system, a communication system, an analysis and decision-making system, etc., and can replace manual work to conduct large-scale, uninterrupted inspections and inspections, and can present the status of the monitored equipment in real time, including infrared thermal imaging, ultraviolet, SF6 leakage detection and other functions, and has the characteristics of being cheap, simple, easy to maintain and flexible configuration.

[0044] After the inspection drone body 10 has completed its work, when the inspection drone body 10 lands, when the landing bottom surface is uneven, the support rod 11 first contacts the bottom surface through the support mechanism 12. When stones or hard objects appear on the bottom surface, the support rod 11 is squeezed with the hard objects under the action of the gravity of the inspection drone body 10, so that the support rod 11 can be flipped and offset to a certain extent. At the same time, the support rod 11 also plays a supporting role for the inspection drone body 10. The support rod 11 is flipped by the rotating column 13, and the rotating column 13 drives the center positioning plate 15 to swing in the arc-shaped slide groove 16, so that The balance spring 17 on one side is squeezed and offset, while the balance spring 17 on the other side is stretched, thereby achieving the purpose of adaptive cushioning landing. The present invention provides a balance mechanism 20 between two support rods 11 and the bottom walls on both sides of the inspection drone body 10. When the inspection drone body 10 lands, the support rod 11 can adaptively squeeze the hard objects on the bottom surface, so that the support rod 11 can flip and offset at a certain slight angle, thereby ensuring the stability and stability of the inspection drone body 10 when landing, and solving the problem of the inspection drone body 10 tilting and tilting when landing.

[0045] Embodiment 2: Figure 2 and Figure 4 As shown, the support mechanism 12 is a cylinder, and the material of the support mechanism 12 is rubber. The two support mechanisms 12 are fixedly connected to the corresponding support rods 11 respectively, and the connection position between the support rods 11 and the support mechanism 12 is located at the center of the support mechanism 12. Evenly distributed support claws 18 are also fixedly installed on the left and right outer walls of the two support mechanisms 12. The material of the support claws 18 is also rubber. The support claws 18 on both sides of each support mechanism 12 are in a symmetrical state, and the support claws 18 on both sides of each support mechanism 12 are symmetrically distributed in an outward-facing "X" shape.

[0046] The support mechanism 12 of the present invention is a cylindrical rubber, which can achieve a certain buffering effect. At the same time, the cylindrical rubber of the support mechanism 12 can be hollow to reduce the overall mass. At the same time, a support claw 18 is provided, which can further ensure the stability of the support mechanism 12 when landing, thereby improving the landing stability and safety of the inspection drone body 10 of the present invention.

[0047] Embodiment 3: Figure 5 As shown, the support mechanism 12 is a buffer bottom plate 30 fixedly connected to the support rod 11. The buffer bottom plate 30 is a half cylinder. The arc surface of the buffer bottom plate 30 is fixedly connected to the corresponding support rod 11. The diameter section end of the buffer bottom plate 30 is in horizontal contact with the ground. The material of the buffer bottom plate 30 is rubber.

[0048] The support mechanism 12 of the present invention is a buffer bottom plate 30 fixedly connected to the support rod 11. The buffer bottom plate 30 is a half cylinder. The arc surface of the buffer bottom plate 30 is fixedly connected to the corresponding support rod 11. The diameter cross-sectional end of the buffer bottom plate 30 is in horizontal contact with the ground. The material of the buffer bottom plate 30 is rubber. The buffer bottom plate 30 can serve the purpose of buffering the overall landing of the inspection drone body 10. At the same time, the cross-sectional end of the buffer bottom plate 30 can increase the contact area with the bottom surface, thereby improving the stability and safety of the landing of the inspection drone body 10 of the present invention.

[0049] Embodiment 4: Figure 6 and Figure 7 As shown, a buffer base 31 is also provided at the bottom of the two buffer bottom plates 30, and a uniformly distributed buffer rod 32 is provided at the bottom of the buffer base 31. The buffer rod 32 is movably installed on the bottom wall of the buffer base 31. The buffer base 31 is a rectangular body. The buffer base 31 is fixedly connected to the buffer bottom plate 30. The buffer rod 32 is a cylinder. A piston 33 is fixedly installed on the top of the buffer rod 32. A buffer groove 34 that is engaged with the piston 33 up and down is opened in the bottom wall of the buffer base 31. The buffer rod 32 movably passes through the bottom wall of the buffer groove 34, and the bottom end of the buffer rod 32 contacts the bottom surface.

[0050] A buffer base 31 is also provided at the bottom of the buffer bottom plate 30 of the present invention, and evenly distributed buffer rods 32 are provided at the bottom of the buffer base 31. The buffer rods 32 are movably mounted on the bottom wall of the buffer base 31. When the inspection drone body 10 lands, the direct contact between the buffer rods 32 and the bottom surface can enable the buffer rods 32 to perform air buffering. The buffer rods 32 are compressed to cause the piston 33 to move in the buffer groove 34, thereby achieving the purpose of multiple buffered landings.

[0051] Embodiment 5: Figure 8 As shown, the support mechanism 12 is composed of a plurality of adjacent balancing blocks 40, a guide sleeve 41 is arranged between two adjacent balancing blocks 40, the balancing block 40 is a cylinder, the material of the balancing block 40 is rubber, the balancing block 40 can move up and down for buffering, a soft pad 42 is fixedly installed at the bottom of the balancing block 40, the soft pad 42 is wavy, the center position of the wall surface of one side of the balancing block 40 is fixedly connected to the guide sleeve 41, a limiting groove 44 is provided on the wall surface of the other side of the balancing block 40, a vertical guide rod 45 is fixedly installed in the limiting groove 44, a through groove 43 is provided on the other end of the guide sleeve 41, the guide sleeve 41 is movably installed together with the guide rod 45 through the through groove 43, and the upper and lower outer walls of the guide rod 45 are sleeved with buffer springs 46, and the buffer springs 46 are located on the upper and lower sides of the guide sleeve 41.

[0052] The support mechanism 12 of the present invention is composed of multiple groups of adjacent balancing blocks 40, and a guide sleeve 41 is arranged between two adjacent balancing blocks 40. The balancing block 40 is a cylinder, and the material of the balancing block 40 is rubber. The balancing block 40 can move up and down for buffering. When the bottom surface of the inspection drone body 10 landing is uneven, the balancing block 40 can realize adaptive buffering. The bottom end with a hard object can make the balancing block 40 move downward, and the bottom end with a pothole can make the balancing block 40 move downward, thereby ensuring the contact area with the bottom surface and improving the landing stability and safety of the inspection drone body 10 of the present invention.

[0053] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A drone for power line inspection, comprising an inspection drone body (10), characterized in that: Support rods (11) are arranged on the left and right side walls of the bottom of the inspection drone body (10), the two support rods (11) are in an outward-facing "eight" shape, and support mechanisms (12) are arranged at the bottom of the two support rods (11). A camera device is also arranged at the center of the bottom of the inspection drone body (10). A balancing mechanism (20) is arranged between the two support rods (11) and the bottom walls on both sides of the inspection drone body (10). The two support rods (11) can swing adaptively to achieve landing cushioning, and the two support mechanisms (12) can achieve landing cushioning with the ground. The balancing mechanism (20) comprises a rotating column (13) fixedly connected to the corresponding support rod (11), a rotating groove (14) is provided in the bottom wall surfaces on the left and right sides of the inspection drone body (10), the rotating column (13) is located in the rotating groove (14) and the rotating column (13) can rotate in the rotating groove (14), a vertically upward center positioning plate (15) is fixedly installed at the top center position of the rotating column (13), an arc-shaped slide groove (16) is provided in the top wall surface of the rotating groove (14), the center positioning plate (15) is engaged in the arc-shaped slide groove (16), and a balancing spring (17) is connected between the center positioning plate (15) and the two side walls of the arc-shaped slide groove (16), the top of the center positioning plate (15) is also connected to a limited arc plate, and an arc-shaped limit groove for engaging the limit arc plate is provided on the inner wall of the arc-shaped slide groove (16); The support mechanism (12) is a cylinder, and the two support mechanisms (12) are respectively fixedly connected to the corresponding support rods (11), and the connection position between the support rods (11) and the support mechanism (12) is located at the center position of the support mechanism (12); Evenly distributed support claws (18) are also fixedly mounted on the left and right outer walls of the two support mechanisms (12), and the support claws (18) on both sides of each support mechanism (12) are symmetrically distributed in an outward-facing "eight" shape; The support mechanism (12) is a buffer bottom plate (30) fixedly connected to the support rod (11); the buffer bottom plate (30) is a half cylinder; the arc surface of the buffer bottom plate (30) is fixedly connected to the corresponding support rod (11); and the diameter section end of the buffer bottom plate (30) is in horizontal contact with the ground; A buffer base (31) is further provided at the bottom of the two buffer bottom plates (30), and evenly distributed buffer rods (32) are provided at the bottom of the buffer base (31), and the buffer rods (32) are movably mounted on the bottom wall of the buffer base (31); The buffer base (31) is a rectangular body, the buffer base (31) is fixedly connected to the buffer bottom plate (30), the buffer rod (32) is a cylindrical body, the top of the buffer rod (32) is fixedly mounted with a piston (33), the bottom wall of the buffer base (31) is provided with a buffer groove (34) which is engaged with the piston (33) in an upper and lower manner, the buffer rod (32) movably passes through the bottom wall of the buffer groove (34), and the bottom end of the buffer rod (32) contacts the bottom surface; The support mechanism (12) is composed of a plurality of adjacent balancing blocks (40), a guide sleeve (41) is arranged between two adjacent balancing blocks (40), the balancing blocks (40) are cylindrical, the material of the balancing blocks (40) is rubber, and the balancing blocks (40) can move up and down for buffering; The center position of one side wall of the balancing block (40) is fixedly connected to the guide sleeve (41), and the other side wall of the balancing block (40) is provided with a limiting groove (44), and a vertical guide rod (45) is fixedly installed in the limiting groove (44). A through groove (43) is provided on the other end of the guide sleeve (41), and the guide sleeve (41) is movably installed with the guide rod (45) through the through groove (43). The upper and lower outer walls of the guide rod (45) are sleeved with buffer springs (46), and the buffer springs (46) are located on the upper and lower sides of the guide sleeve (41); A soft pad (42) is fixedly mounted on the bottom of each balancing block (40), and the soft pad (42) is wavy in shape.

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