Power equipment testing device based on high precision

Abstract

The invention discloses an electrical equipment testing device based on high precision, and relates to the technical field of electrical equipment testing, the electrical equipment testing device comprises a box body, a clamping block is fixed on the lower surface of one side of the box body, and a double-shaft motor is mounted at the upper end of the inner side of the box body through a bolt; an output shaft at one end of the double-shaft motor is connected with a clamping assembly used for fixing the testing device, an output shaft at the other end of the double-shaft motor is connected with bevel gear sets which are vertically meshed with each other, and the other end of each bevel gear set is connected with a lifting assembly used for adjusting the height. The electric power equipment testing device based on high precision is provided with the electric leakage detection rod, annular reciprocating detection is carried out at different heights of one side of equipment, manual handheld detection is not needed, the possibility of mistaken touch is reduced, meanwhile, the electric leakage detection rod for carrying out electric leakage detection at different point positions at different heights has better detection precision than manual detection, and the detection efficiency is improved. And compared with manual handheld detection, detection points are denser, and detection omission areas are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment testing, and in particular to a high-precision power equipment testing device. Background Art

[0002] Power equipment testing is a critical component in ensuring the safe and reliable operation of power systems. With socioeconomic development and growing electricity demand, the importance of power equipment is becoming increasingly prominent. To promptly identify equipment hazards and prevent accidents, leakage testing is often the first step. Failure to test for leakage in power equipment can make subsequent repairs dangerous and potentially expose maintenance personnel to electric shock.

[0003] After searching, there is a leakage detection device for electrical equipment with the publication number CN202111067085.1, which includes an emitting component, a feeding component and a detection component. The leakage detection device used in this invention can quickly and intuitively check whether high-altitude electrical equipment is leaking; this invention uses a viscous conductor to perform contact detection with the electrical equipment. The driving mode of the detection mechanism is relatively simple, and the coverage of the detection surface of the electrical equipment is low. The test detection accuracy is low, and it is easy to produce test blind spots due to large changes in the travel trajectory, affecting the safety of the testing and use of the electrical equipment. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-precision power equipment testing device, which solves the existing problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A high-precision power equipment testing device, comprising:

[0006] A box body, a clamping block is fixed to the lower surface of one side of the box body, a dual-axis motor is installed on the inner upper end of the box body by bolts, one end output shaft of the dual-axis motor is connected to a clamping assembly for fixing the test device, the other end output shaft of the dual-axis motor is connected to a bevel gear set that meshes vertically with each other, the other end of the bevel gear set is connected to a lifting assembly for adjusting the height, a driving assembly is fixed to the inner surface of the lifting assembly by bolts, a detection assembly is connected to the inner side of the driving assembly, and a leakage detection rod is embedded in the inner side of the detection assembly.

[0007] Optionally, a driven gear is provided at the connection between the clamping assembly and the output shaft of the dual-axis motor, and a gear ring is provided on the output shaft ring of the dual-axis motor near one end of the driven gear. A groove matching the outer structure of the gear ring is provided at the connection between the driven gear and the gear ring, and the driven gear is meshed with the output shaft of the dual-axis motor through the groove and the gear ring. A cylindrical pressure plate is fixed to the outer wall of the other side of the driven gear, and the pressure plate extends to the outer wall of one side of the box body, and the driven gear is slidably connected to the output shaft of the dual-axis motor through the pressure plate.

[0008] Optionally, a guide rod is provided on the inner wall of the clamping assembly close to one side of the box body, a tooth plate is provided on the outer wall of the guide rod, and the tooth plate extends to the outer wall of the box body away from the guide rod, and the tooth plate is engaged with the lower outer wall of the driven gear, and limiting grooves are provided on the outer walls on both sides of the tooth plate, and the tooth plate is telescopically connected to the box body through the limiting grooves and the guide rod, and a splint is fixed on the lower surface of the end of the tooth plate away from the box body, and a pin is passed through the lower outer wall of the splint.

[0009] Optionally, a fixed platform is provided at one end of the lifting assembly close to the bevel gear group, and the fixed platform is mounted on the outer wall of one side of the box close to the bevel gear group by bolts, a screw is passed through the lower surface of the middle part of the fixed platform through a bearing, and one end of the screw is connected to the lower surface of one end of the bevel gear group, and limiting rods are also fixed to the lower surfaces of both sides of the fixed platform, and the outer surfaces of the screw and the limiting rod are sleeved with a lifting platform, and the lifting platform is slidably connected by the screw, the bevel gear group and the limiting rod, and a fixing plate is fixed to the inner surface of the lifting platform.

[0010] Optionally, a mounting plate is installed on the side of the driving component close to the lifting component by bolts, and a stepper motor is embedded in the outer walls of both ends of the mounting plate by bolts. A mounting seat is fixed to the upper surface of the mounting plate by bolts, and a driving shaft is passed through the outer wall of the upper end of the mounting seat through a bearing. A transmission belt is sleeved on the outer wall of one end of the driving shaft close to the driving component, and the other end of the transmission belt is sleeved on the outer wall of the output shaft of the stepper motor.

[0011] Optionally, a detachable structure is formed between the mounting plate and the lifting assembly, and the drive shaft is rotationally connected to the mounting seat through a transmission belt and an output shaft of the stepping motor.

[0012] Optionally, a flexible rubber strip is provided at the connection between the detection component and the driving component, and connection holes are opened at both ends of the flexible rubber strip. The flexible rubber strips form a ring structure through the connection holes and the buckles, and a socket is installed on the middle outer surface of the flexible rubber strip through bolts, and the leakage detection rod is embedded in the inner side of the socket.

[0013] Optionally, the flexible rubber strips are connected through the connection holes to form a detachable structure, and the leakage detection rod is connected through the socket and the flexible rubber strips to form a vertical structure.

[0014] Optionally, a sleeve is fixed to the inner wall of the end of the lifting assembly away from the fixed platform, and the inner surfaces of both ends of the sleeve are connected to elastically rotatable rollers through torsion springs, and an enclosing structure is formed between the sleeve and the roller. A protective cloth made of insulating material is wrapped around the outer wall of the roller, and one end of the protective cloth passes through the upper outer wall of the sleeve, and a tow rod is connected to the end of the protective cloth away from the sleeve, and the tow rod is fixed to the lower outer wall of the fixed plate by bolts.

[0015] The present invention provides a high-precision electric power equipment testing device, which has the following beneficial effects: the high-precision electric power equipment testing device is provided with a pressure plate, which can drive the driven gear to connect or disconnect on the output shaft at one end of the dual-axis motor when the pressure plate is pressed down or pulled out, so that the test device can be clamped firmly on the electric power equipment to be tested by the clamping plate when the electric power equipment is not powered on, and then the lifting component is driven by the output shaft at the other end of the dual-axis motor, and the driving component drives the detection component to rotate, so that the leakage detection rod for testing whether the electric power equipment has leakage can perform circular reciprocating detection at different heights on one side of the equipment after the equipment is powered on, without manual hand-held detection, reducing the possibility of accidental touch, and at the same time, the leakage detection rod for performing leakage detection at different points at different heights has better detection accuracy than manual detection, and the detection points are more dense than manual hand-held detection, reducing the missed detection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the combined working state of the present invention;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the box body of the present invention;

[0018] Figure 3 This is an enlarged structural diagram of the dual-axis motor and driven gear of the present invention in a partially disassembled state;

[0019] Figure 4 This is an enlarged structural diagram of the driven gear and the gear plate in the combined state of the present invention;

[0020] Figure 5 This is a partially enlarged structural diagram of the lifting assembly of the present invention;

[0021] Figure 6 This is a partially enlarged structural diagram of the drive assembly of the present invention;

[0022] Figure 7 This is a partially enlarged structural diagram of the flexible adhesive strip of the present invention;

[0023] Figure 8 It is a schematic diagram of the internal structure of the sleeve of the present invention.

[0024] In the figure: 1. Box body; 2. Clamping block; 3. Dual-axis motor; 4. Clamping assembly; 401. Driven gear; 402. Gear ring; 403. Embossed groove; 404. Pressure plate; 405. Guide rod; 406. Tooth plate; 407. Limiting groove; 408. Clamping plate; 409. Latch; 5. Bevel gear set; 6. Lifting assembly; 601. Fixed platform; 602. Screw; 603. Limiting rod; 604. Lifting platform; 605. Fixed plate; 7. Driving assembly; 701. Mounting plate; 702. Stepping motor; 703. Mounting seat; 704. Driving shaft; 705. Transmission belt; 8. Detection assembly; 801. Flexible rubber strip; 802. Connecting hole; 803. Socket; 9. Leakage detection rod; 10. Sleeve; 11. Roller; 12. Protective cloth; 13. Drag rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0028] See also Figure 1-Figure 4The present invention provides a technical solution: a high-precision power equipment testing device, comprising: a box body 1, a clamping block 2 is fixed to the lower surface of one side of the box body 1, a dual-axis motor 3 is installed on the upper end of the inner side of the box body 1 by bolts, one end of the output shaft of the dual-axis motor 3 is connected to a clamping assembly 4 for fixing the testing device, the other end of the output shaft of the dual-axis motor 3 is connected to a bevel gear set 5 that meshes vertically with each other, the other end of the bevel gear set 5 is connected to a lifting assembly 6 for adjusting the height, the inner surface of the lifting assembly 6 is fixed with a driving assembly 7 by bolts, the inner side of the driving assembly 7 is connected to a detection assembly 8, the inner side of the detection assembly 8 is embedded with a leakage detection rod 9, the clamping assembly 4 and the dual-axis A driven gear 401 is provided at the connection of the output shaft of the motor 3, and a gear ring 402 is provided at the output shaft ring of the dual-axis motor 3 near one end of the driven gear 401. A groove 403 that matches the outer structure of the gear ring 402 is provided at the connection between the driven gear 401 and the gear ring 402, and the driven gear 401 is meshed with the output shaft of the dual-axis motor 3 through the groove 403 and the gear ring 402. A cylindrical pressure plate 404 is fixed to the outer wall of the other side of the driven gear 401, and the pressure plate 404 passes through the outer wall of one side of the box body 1, and the driven gear 401 is slidably connected to the output shaft of the dual-axis motor 3 through the pressure plate 404, and the driven gear 401 can be pressed down by the pressure plate 404. The disc 404 engages the embedded groove 403 and the gear ring 402, thereby connecting the driven gear 401 to the dual-axis motor 3, and the gear plate 406 is telescopically adjusted by the driving shaft 704 at one end of the dual-axis motor 3. The driven gear 401 can also be disengaged from the gear ring 402 of the dual-axis motor 3 by pulling the pressure plate 404 outward, so that the power transmitted by the output shaft of the dual-axis motor 3 will not affect the driven gear 401, and at the same time, the pressure plate 404 is kept stable to prevent the gear plate 406 from loosening; the inner wall of the clamping assembly 4 close to the box body 1 is provided with a guide rod 405, and the outer wall of the guide rod 405 is provided with a gear plate 406, and the gear plate 406 penetrates the box body 1 away from the guide rod 405 One side outer wall, and the tooth plate 406 is engaged with the lower end outer wall of the driven gear 401, and the outer walls on both sides of the tooth plate 406 are provided with limiting grooves 407, and the tooth plate 406 is telescopically connected to the box body 1 through the limiting grooves 407 and the guide rod 405, and the guide rod 405 and the limiting groove 407 are used to prevent the telescopic direction of the tooth plate 406 from deviating; a splint 408 is fixed to the lower surface of the end of the tooth plate 406 away from the box body 1, and a pin 409 is passed through the outer wall of the lower end of the splint 408. The pin 409 is used to provide a clamping tightness effect display on the inner side of the splint 408. When the pin 409 protrudes from the outside of the splint 408, it means that the inner surface of the splint 408 is in contact with the surface of the clamped electrical equipment.

[0029] See also Figure 1 and Figure 5, a high-precision power equipment testing device, comprising: a lifting component 6 is provided with a fixed platform 601 at one end near the bevel gear group 5, and the fixed platform 601 is installed on the outer wall of one side of the box body 1 near the bevel gear group 5 by bolts, and a screw 602 is passed through the lower surface of the middle part of the fixed platform 601 through a bearing, and one end of the screw 602 is connected to the lower surface of one end of the bevel gear group 5, and the fixed platform 601 is provided to cooperate with the screw 602 and the output shaft of the dual-axis motor 3 to firmly connect the bevel gear group 5, and the lower surfaces of both sides of the fixed platform 601 are also fixed with limit rods 603, and the outer surfaces of the screw 602 and the limit rod 603 are sleeved with a lifting platform 604, and the lifting platform 604 is slidably connected by the screw 602, the bevel gear group 5 and the limit rod 603. A fixing plate 605 is fixed to the inner surface of the lifting platform 604, and the lifting platform 604 is used to adjust the test device Test point height; a sleeve 10 is fixed to the inner wall of the end of the lifting component 6 away from the fixed platform 601, and the inner surfaces of both ends of the sleeve 10 are connected to elastically rotatable rollers 11 through torsion springs, and a surrounding structure is formed between the sleeve 10 and the roller 11, and the roller 11 is used to assist the protective cloth 12 in recycling and winding, which is convenient for the storage of the protective cloth 12; a protective cloth 12 made of insulating material is wrapped around the outer wall of the roller 11, and one end of the protective cloth 12 passes through the upper outer wall of the sleeve 10, and the end of the protective cloth 12 away from the sleeve 10 is connected to a drag rod 13, and the drag rod 13 is fixed to the lower outer wall of the fixed plate 605 by bolts. When the fixed plate 605 is raised and lowered, the set drag rod 13 drives the protective cloth 12 made of polyester fiber insulating material to retract and retract on one side of the sleeve 10. When there is a need for protection, it can provide insulation protection function on the surface of the tested electrical equipment, thereby improving the safety of the test operation.

[0030] See also Figure 1 and Figure 6 A high-precision power equipment testing device includes: a mounting plate 701 is installed on the side of the driving component 7 close to the lifting component 6 by bolts, and a stepper motor 702 is embedded in the outer wall of the two ends of the mounting plate 701 by bolts. The upper surface of the mounting plate 701 is fixed with a mounting seat 703 by bolts. The spacing of the mounting seats 703 can be adjusted according to the size of the power equipment; a driving shaft 704 is passed through the outer wall of the upper end of the mounting seat 703 through a bearing. The driving shaft 704 is used to pass through the transmission belt 705 and the stepper motor 702 The output shaft drives the detection component 8 to rotate; a transmission belt 705 is sleeved on the outer wall of one end of the driving shaft 704 close to the driving component 7, and the other end of the transmission belt 705 is sleeved on the outer wall of the output shaft of the stepping motor 702. A detachable structure is formed between the mounting plate 701 and the lifting component 6, and the driving shaft 704 is rotatably connected with the output shaft of the stepping motor 702 and the mounting seat 703 through the transmission belt 705. The transmission belt 705 is used to enable the stepping motor 702 to drive the driving shaft 704 to rotate.

[0031] See also Figure 1 and Figure 7 , a high-precision power equipment testing device, comprising: a flexible rubber strip 801 is provided at the connection between the detection component 8 and the driving component 7, and connection holes 802 are opened at both ends of the flexible rubber strip 801. The flexible rubber strips 801 form a ring structure through the connection holes 802 and the buckle. The buckle is used to combine and connect the two flexible rubber strips 801, so that the staff can select the appropriate number of flexible rubber strips 801 for connection and assembly according to the size of the power equipment to be tested; and a socket 803 is installed on the outer surface of the middle part of the flexible rubber strip 801 through bolts, and the leakage detection rod 9 is embedded in the inner side of the socket 803, and the flexible rubber strips 801 form a detachable structure through the connection holes 802, and the leakage detection rod 9 forms a vertical structure between the socket 803 and the flexible rubber strip 801.

[0032] In summary, when using the high-precision power equipment testing device, first place the box body 1 of the device on the unpowered power equipment to be tested, and make the clamping block 2 fixed on one side of the box body 1 fit the outer wall of one side of the power equipment, then insert the pin 409 at the lower end of the clamping plate 408, so that the pin 409 protrudes toward the inner side of the clamping plate 408, and then start the dual-axis motor 3, so that the dual-axis motor 3 drives the lifting platform 604 of the lifting assembly 6 to reset upward, and at the same time, the staff presses the pressure plate 404 toward the inner side of the box body 1, so that the pressure plate 404 drives one end of the dual-axis motor 3 The driven gear 401 on the output shaft moves toward the gear ring 402. While the driven gear 401 is meshing with the gear ring 402 through the embedded groove 403, the lower end of the driven gear 401 is meshing with the upper surface of the gear plate 406, driving the gear plate 406 to retract toward the inside of the box body 1 through the limit groove 407 and the guide rod 405. When the clamping plate 408 is in contact with the surface of the power equipment, the latch 409 protrudes from the outer surface of the clamping plate 408. At this time, the staff pulls out the pressure plate 404 to separate the driven gear 401 from the gear ring 402 on the output shaft of one end of the dual-axis motor 3. The driven gear 40 1 loses power and no longer rotates actively. The staff fixes the pressure plate 404 to keep the gear plate 406 stable, so that the test device remains stable on the power equipment. Then the output shaft at the other end of the dual-axis motor 3 drives the lifting component 6 through the bevel gear set 5. The screw 602 and the limit rod 603 of the lifting component 6 are installed at the lower end of one side of the box body 1 through the fixed platform 601. The output shaft of the dual-axis motor 3 drives the connected screw 602 through the bevel gear set 5, thereby driving the lifting platform 604 to move on the screw 602 and the limit rod 603. The lifting platform 604 is connected and fixed to the driving component 7 through the fixing plate 605. The driving component 7 drives the driving shaft 704 on the mounting seat 703 through the stepping motor 702 and the transmission belt 705 embedded at both ends of the mounting plate 701. The spacing of the mounting seats 703 and the number of flexible rubber strips 801 are adjusted and assembled by the staff according to the specifications of the tested power equipment, so that the travel trajectory of the leakage detection rod 9 installed on the socket 803 can completely cover the surface to be tested of the power equipment, providing better test accuracy.

[0033] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A high-precision power equipment testing device, characterized in that: include: A box body (1) is provided, wherein a clamping block (2) is fixed to the lower surface of one side of the box body (1), a double-axis motor (3) is installed on the inner upper end of the box body (1) by means of bolts, an output shaft at one end of the double-axis motor (3) is connected to a clamping assembly (4) for fixing the test device, an output shaft at the other end of the double-axis motor (3) is connected to a bevel gear set (5) meshing perpendicularly with each other, the other end of the bevel gear set (5) is connected to a lifting assembly (6) for adjusting the height, a driving assembly (7) is fixed to the inner surface of the lifting assembly (6) by means of bolts, a detection assembly (8) is connected to the inner side of the driving assembly (7), and a leakage detection rod (9) is embedded in the inner side of the detection assembly (8).

2. The high-precision power equipment testing device according to claim 1, characterized in that: A driven gear (401) is provided at the connection between the clamping assembly (4) and the output shaft of the dual-axis motor (3); a gear ring (402) is provided on the output shaft ring of the dual-axis motor (3) near one end of the driven gear (401); an embedding groove (403) that matches the outer structure of the gear ring (402) is provided at the connection between the driven gear (401) and the gear ring (402); the driven gear (401) is meshedly connected to the output shaft of the dual-axis motor (3) through the embedding groove (403) and the gear ring (402); a cylindrical pressure plate (404) is fixed to the outer wall of the other side of the driven gear (401), and the pressure plate (404) penetrates the outer wall of one side of the box body (1); and the driven gear (401) is slidably connected to the output shaft of the dual-axis motor (3) through the pressure plate (404).

3. The high-precision power equipment testing device according to claim 2, characterized in that: The clamping assembly (4) is provided with a guide rod (405) on the inner wall of the side close to the box body (1), and the outer wall of the guide rod (405) is provided with a tooth plate (406), and the tooth plate (406) penetrates to the outer wall of the side of the box body (1) away from the guide rod (405), and the tooth plate (406) is engaged with the lower end outer wall of the driven gear (401), and the outer walls on both sides of the tooth plate (406) are provided with limiting grooves (407), and the tooth plate (406) is telescopically connected to the box body (1) through the limiting grooves (407) and the guide rod (405), and a clamp (408) is fixed to the lower surface of the end of the tooth plate (406) away from the box body (1), and a pin (409) is penetrated through the lower end outer wall of the clamp (408).

4. The high-precision power equipment testing device according to claim 1, characterized in that: A fixed platform (601) is provided at one end of the lifting assembly (6) close to the bevel gear set (5), and the fixed platform (601) is mounted on an outer wall of a side of the box body (1) close to the bevel gear set (5) by means of bolts. A screw rod (602) is passed through a bearing on the lower surface of the middle portion of the fixed platform (601), and one end of the screw rod (602) is connected to the lower surface of one end of the bevel gear set (5). Limit rods (603) are also fixed to the lower surfaces of both sides of the fixed platform (601). A lifting platform (604) is sleeved on the outer surfaces of the screw rod (602) and the limit rod (603). The lifting platform (604) is slidably connected by the screw rod (602), the bevel gear set (5) and the limit rod (603). A fixing plate (605) is fixed to the inner surface of the lifting platform (604).

5. The high-precision power equipment testing device according to claim 1, characterized in that: A mounting plate (701) is mounted on one side of the driving assembly (7) close to the lifting assembly (6) by means of bolts, and a stepper motor (702) is embedded in the outer walls of both ends of the mounting plate (701) by means of bolts, and a mounting seat (703) is fixed to the upper surface of the mounting plate (701) by means of bolts, and a driving shaft (704) is passed through the outer wall of the upper end of the mounting seat (703) by means of a bearing, and a transmission belt (705) is sleeved on the outer wall of one end of the driving shaft (704) close to the driving assembly (7), and the other end of the transmission belt (705) is sleeved on the outer wall of the output shaft of the stepper motor (702).

6. The high-precision power equipment testing device according to claim 5, characterized in that: The mounting plate (701) and the lifting assembly (6) form a detachable structure, and the drive shaft (704) is rotatably connected to the mounting seat (703) via a transmission belt (705) and an output shaft of a stepping motor (702).

7. The high-precision power equipment testing device according to claim 1, characterized in that: A flexible rubber strip (801) is provided at the connection between the detection component (8) and the drive component (7), and connection holes (802) are provided at both ends of the flexible rubber strip (801). The flexible rubber strips (801) form an annular structure through the connection holes (802) and the buckles, and a socket (803) is installed on the outer surface of the middle portion of the flexible rubber strip (801) through bolts, and the leakage detection rod (9) is embedded in the inner side of the socket (803).

8. The high-precision power equipment testing device according to claim 7, characterized in that: The flexible rubber strips (801) form a detachable structure through the connection holes (802), and the leakage detection rod (9) forms a vertical structure between the flexible rubber strips (801) through the socket (803).

9. The high-precision power equipment testing device according to claim 4, characterized in that: A sleeve (10) is fixed to the inner wall of one end of the lifting component (6) away from the fixed platform (601), and the inner surfaces of both ends of the sleeve (10) are connected to elastically rotatable rollers (11) through torsion springs, and a surrounding structure is formed between the sleeve (10) and the roller (11), and a protective cloth (12) made of insulating material is wound around the outer wall of the roller (11), and one end of the protective cloth (12) passes through the upper outer wall of the sleeve (10), and the end of the protective cloth (12) away from the sleeve (10) is connected to a drag rod (13), and the drag rod (13) is fixed to the lower outer wall of the fixed plate (605) by bolts.

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