Power cable with high current-carrying capacity

Abstract

The invention discloses a power cable with high current-carrying capacity, and relates to the technical field of cables. The device comprises a protective device, a heat dissipation device, a connecting device and a tightening device. Wherein the protection device comprises a supporting frame, waterproof rubber, a connecting frame and a protection sleeve, the supporting frame is fixedly installed on the surface of the cable body, the waterproof rubber is fixedly installed on the surface of the supporting frame, the connecting frame is fixedly installed on the surface of the waterproof rubber, and the protection sleeve is fixedly installed on the surface of the connecting frame; wherein the heat dissipation device comprises a moving block and an arc-shaped air bag, the arc-shaped air bag is fixedly installed on the surface of the cable body, and the moving block is slidably connected between the inner wall and the outer wall of the waterproof rubber in a sleeving mode. And meanwhile, water can be prevented from being in contact with the cable body through the waterproof rubber.

Description

Technical Field

[0001] This invention relates to the field of cable technology, specifically to a high current-carrying power cable. Background Technology

[0002] Cable is a device for transmitting electricity and signals. Utility model patent CN215118434U relates to a high current-carrying power cable, comprising several cable cores and an insulating sleeve covering the cable cores. A support frame is provided inside the insulating sleeve, and four insulating plates are provided on the outer surface of the support frame. Several through holes are opened on the outer surface of the support frame. The surface of each cable core is in contact with the outer surface of the support frame, and the cable core is located between two adjacent insulating plates. By setting a hollow support frame and providing several heat dissipation holes on the support frame, the heat generated by the cable cores between the insulating plates can be transferred to the interior of the support frame, thereby maintaining the heat on the surface of the cable cores and increasing the current-carrying capacity of the cable. Simultaneously, the winding layer improves the cable's corrosion resistance, and the aluminum alloy braided protective layer and the chlorinated polyethylene insulating layer protect the cable cores.

[0003] In the aforementioned utility model, by setting a hollow support frame and setting several heat dissipation holes on the support frame, the heat generated by the cable core between the isolation plates can be dissipated. However, when heat is dissipated through the heat dissipation holes, it will cause damage to the outer wall of the cable. At this time, water will enter the interior of the cable and affect the cable, so that the heat dissipation through the heat dissipation holes will affect the overall quality of the cable.

[0004] Therefore, it is essential to design a high-current-carrying power cable that is highly practical and has ventilation ports to dissipate heat from the cable body inside the waterproof rubber, while preventing water from coming into contact with the cable body through the waterproof rubber. Summary of the Invention

[0005] The purpose of this invention is to provide a high current-carrying power cable to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high current-carrying power cable, comprising a cable body, and further comprising: a protective device, a heat dissipation device, a connecting device, and a tightening device; wherein, the protective device comprises a support frame, waterproof rubber, a connecting frame, and a protective sleeve, the support frame being fixedly installed on the surface of the cable body, the waterproof rubber being fixedly installed on the surface of the support frame, the connecting frame being fixedly installed on the surface of the waterproof rubber, and the protective sleeve being fixedly installed on the surface of the connecting frame; wherein, the heat dissipation device comprises a moving block and an arc-shaped airbag, the arc-shaped airbag being fixedly installed on the surface of the cable body, the moving block being slidably sleeved between the inner and outer walls of the waterproof rubber, and the inner wall of the moving block having an air exchange port; wherein, the connecting device comprises a docking component and a pressing component, both of which are disposed on the surface of the protective sleeve; the tightening device comprises a force-bearing component and an air-suction component, both of which are disposed on the waterproof rubber, and the air exchange port inside the moving block can dissipate heat from the cable body inside the waterproof rubber, while preventing water from contacting the cable body through the waterproof rubber.

[0007] According to the above technical solution, a hollow frame is fixedly installed on the surface of the cable body, and a movable rod is slidably sleeved on the surface of the hollow frame. The interior of the hollow frame is connected to the interior of the arc-shaped airbag through a pipe. A piston is provided between the movable rod and the inner wall of the hollow frame. When the air pressure inside the hollow frame increases, it will push the movable rod to move outward of the hollow frame. When the movable rod moves outward of the hollow frame, it will support the cable body and prevent the cable body from bending further.

[0008] According to the above technical solution, an expansion water-stop block is fixedly installed at the end of the movable block away from the cable body. A spring is provided between the movable block and the waterproof rubber. When the expansion water-stop block expands, it will push the movable block to move into the interior of the waterproof rubber, thereby preventing water from entering the interior of the waterproof rubber through the ventilation port and improving the protection effect on the cable body.

[0009] According to the above technical solution, the docking assembly includes a mounting frame, which is fixedly mounted on the surface of the protective sleeve. An annular compression airbag is fixedly mounted inside the mounting frame. The compression assembly includes a compression block, which is slidably fitted inside the mounting frame. An arc-shaped rod is fixedly mounted on the surface of the compression block, and a bidirectional threaded rod is threaded to the top of the arc-shaped rod.

[0010] According to the above technical solution, the bottom of the arc-shaped rod is elastic, and a contact block is fixedly installed at the bottom of the arc-shaped rod. When the mounting frame is subjected to downward pressure, the bottom of the arc-shaped rod will generate a force that causes the arc-shaped rod to push the contact block to squeeze the annular compression airbag, so that the annular compression airbag will fit more tightly on the protective sleeve, preventing the cable body from separating.

[0011] According to the above technical solution, the surface of the mounting frame is provided with a puncture device, which includes a fixed frame. The fixed frame is fixedly installed inside the mounting frame. A groove is opened inside the mounting frame. A sealing plate is slidably installed on the inner wall of the fixed frame. A push rod is fixedly installed on the top of the sealing plate. An insert is slidably installed inside the groove. A locking plate is slidably installed on the left side of the insert. A first spring is provided between the insert and the groove. The annular compression airbag contains flame-retardant gas. When the insert moves, it will puncture the annular compression airbag, and the gas inside the annular compression airbag will be released, thereby extinguishing the fire inside the protective sleeve and preventing the cable body from further burning.

[0012] According to the above technical solution, the top of the push rod contacts the positioning plate, and the groove is T-shaped. The T-shaped groove can limit the positioning plate and the insertion block.

[0013] According to the above technical solution, the force-bearing component includes a bifurcated frame, which is fixedly installed on the right side of the waterproof rubber. The air-suction component includes a connecting frame, which is fixedly installed on the surface of the bifurcated frame. A fixing plate is fixedly installed inside the connecting frame, and a one-way valve is fixedly installed inside the fixing plate. A cover plate is slidably installed on the inner wall of the connecting frame, and a force-bearing rod is fixedly installed on the top of the cover plate. A two-way valve is fixedly installed inside the cover plate. One-way valve one can only discharge the gas inside the bifurcated frame, and one-way valve two can only discharge the gas between the fixing plate and the cover plate. The cover plate, through one-way valve one, can draw in the gas between the bifurcated frame and the waterproof rubber, which can improve the effect of the waterproof rubber entering the bifurcated frame and prevent the waterproof rubber from detaching from the bifurcated frame and affecting the connection effect of the cable body. At the same time, the bifurcated frame can connect the waterproof rubbers, preventing leakage at the connection point and affecting the overall effect of the cable body.

[0014] According to the above technical solution, a reset spring is provided between the cover plate and the connecting frame, and the force rod is in contact with the inner wall of the protective sleeve. The reset spring can drive the cover plate and the force rod to reset.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) The high current carrying capacity power cable will improve the protection effect of the cable body through waterproof rubber and protective sleeve. When the internal temperature of the waterproof rubber is too high, the arc-shaped air bladder will expand and push the moving block to move. The air exchange port inside the moving block can dissipate heat from the cable body inside the waterproof rubber. At the same time, it can prevent water from contacting the cable body through the waterproof rubber. When the cable body is bent, the arc-shaped air bladder will be squeezed. The gas inside the arc-shaped air bladder will push the moving rod to move. The moving rod can prevent the cable body from bending further.

[0016] (2) The high current carrying capacity power cable can drive the arc frame and the extrusion block to be squeezed by rotating the bidirectional threaded rod. The extrusion block will squeeze the annular extrusion airbag, so that the annular extrusion airbag will be tightly attached to the protective sleeve. Thus, the sealing effect after the cable body is connected can be achieved. When the position of the mounting frame is squeezed, the bottom of the arc rod will bend and push the contact block to move. The contact block will improve the squeezing effect on the annular extrusion airbag, and further improve the sealing effect when the mounting frame is squeezed.

[0017] (3) The high current carrying capacity power cable will spontaneously combust, causing the temperature inside the protective sleeve to rise. This will cause the gas inside the fixed frame to expand and push the sealing plate and the movable rod to move upward. The movable rod will push the locking plate to contact the limit of the plug block, causing the plug block to puncture the annular compression airbag. This will release the gas inside the annular compression airbag, thereby extinguishing the fire inside the protective sleeve.

[0018] (4) The high current carrying capacity power cable can achieve a sealing effect between the waterproof rubbers through the bifurcation frame, preventing water from entering the interior of the cable body through the waterproof rubber connection. When the mounting frame is squeezed, it will push the force rod and cover plate to move. The one-way valve on the cover plate can adsorb the gas inside the bifurcation frame, thereby improving the effect of the waterproof rubber entering the bifurcation frame and preventing the waterproof rubber from detaching from the bifurcation frame and affecting the connection effect of the cable body. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the position of the movable block of the present invention; Figure 3 This is a schematic diagram of the structure of the movable block of the present invention; Figure 4 This is a schematic diagram of the overall cross-section of the present invention; Figure 5 This is a schematic diagram of the insert block of the present invention; Figure 6 This is a schematic diagram of the cross-section of the connecting frame of the present invention; In the diagram: 1. Cable body; 21. Support frame; 22. Waterproof rubber; 23. Connecting frame; 24. Protective sleeve; 31. Moving block; 32. Arc-shaped airbag; 33. Hollow frame; 34. Movable rod; 35. Expansion sealing block; 41. Mounting frame; 42. Extrusion block; 43. Arc-shaped rod; 44. Annular extrusion airbag; 45. Bidirectional threaded rod; 46. Contact block; 51. Fixing frame; 52. Sealing plate; 53. Push rod; 54. Insert block; 55. Positioning plate; 61. Forked frame; 62. Connecting frame; 63. Fixing plate; 64. One-way valve one; 65. Cover plate; 66. One-way valve two; 67. Force-bearing rod. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-6 This invention provides a technical solution: a high current-carrying power cable, comprising a cable body 1, and further comprising: a protective device, a heat dissipation device, a connecting device, and a sealing device; wherein, the protective device includes a support frame 21, a waterproof rubber 22, a connecting frame 23, and a protective sleeve 24, the support frame 21 being fixedly installed on the surface of the cable body 1, the waterproof rubber 22 being fixedly installed on the surface of the support frame 21, the connecting frame 23 being fixedly installed on the surface of the waterproof rubber 22, and the protective sleeve 24 being fixedly installed on the surface of the connecting frame 23; wherein, the heat dissipation device includes a moving block 31 and an arc-shaped airbag 32, the arc-shaped airbag 32 being fixedly installed on the surface of the cable body 1, and the moving block 31 being slidably sleeved between the inner and outer walls of the waterproof rubber 22. The inner wall of the moving block 31 is provided with a ventilation port; the connecting device includes a docking component and a squeezing component, both of which are disposed on the surface of the protective sleeve 24; the sealing device includes a force-bearing component and a suction component, both of which are disposed on the waterproof rubber 22; the gas inside the arc-shaped airbag 32 will expand, causing the arc-shaped airbag 32 to push the moving block 31 to move; when the moving block 31 moves, the ventilation port will move to the outside of the waterproof rubber 22, and the ventilation port will connect the inner and outer walls of the waterproof rubber 22; the ventilation port inside the moving block 31 can dissipate heat to the cable body 1 inside the waterproof rubber 22, and at the same time prevent water from contacting the cable body 1 through the waterproof rubber 22.

[0022] A hollow frame 33 is fixedly installed on the surface of the cable body 1. A movable rod 34 is slidably sleeved on the surface of the hollow frame 33. The interior of the hollow frame 33 is connected to the interior of the arc-shaped airbag 32 through a pipe. A piston is provided between the movable rod 34 and the inner wall of the hollow frame 33. When the cable body 1 bends, it will squeeze the movable block 31, causing the movable block 31 to move into the interior of the waterproof rubber 22. The movable block 31 will then squeeze the arc-shaped airbag 32, causing the gas inside the arc-shaped airbag 32 to enter the interior of the hollow frame 33 through the pipe. The increased air pressure inside the hollow frame 33 will push the movable rod 34 to move outward from the hollow frame 33. When the movable rod 34 moves outward from the hollow frame 33, it will support the cable body 1 and prevent the cable body 1 from bending further.

[0023] An expansion stop block 35 is fixedly installed at the end of the movable block 31 away from the cable body 1. A spring is provided between the movable block 31 and the waterproof rubber 22. When the protective sleeve 24 is damaged and water enters the interior of the protective sleeve 24, the expansion stop block 35 will expand after contacting the water. The expansion of the expansion stop block 35 will push the movable block 31 to move into the interior of the waterproof rubber 22, thereby preventing water from entering the interior of the waterproof rubber 22 through the vent and improving the protection effect on the cable body 1.

[0024] The docking assembly includes a mounting frame 41, which is fixedly mounted on the surface of the protective sleeve 24. An annular compression airbag 44 is fixedly mounted inside the mounting frame 41. The compression assembly includes a compression block 42, which is slidably sleeved inside the mounting frame 41. An arc-shaped rod 43 is fixedly mounted on the surface of the compression block 42, and a bidirectional threaded rod 45 is threadedly connected to the top of the arc-shaped rod 43.

[0025] The bottom of the arc-shaped rod 43 is elastic, and a contact block 46 is fixedly installed at the bottom of the arc-shaped rod 43. When the mounting frame 41 is subjected to downward pressure, the bottom of the arc-shaped rod 43 will generate a force that causes the arc-shaped rod 43 to push the contact block 46 to squeeze the annular compression airbag 44, so that the annular compression airbag 44 will fit more tightly on the protective sleeve 24, preventing the cable body 1 from separating.

[0026] The surface of the mounting frame 41 is provided with a puncture device, which includes a fixed frame 51. The fixed frame 51 is fixedly installed inside the mounting frame 41. A groove is formed inside the mounting frame 41. A sealing plate 52 is slidably installed on the inner wall of the fixed frame 51. A push rod 53 is fixedly installed on the top of the sealing plate 52. An insert block 54 is slidably installed inside the groove. A locking plate 55 is slidably installed on the left side of the insert block 54. A first spring is provided between the insert block 54 and the groove. The annular compression airbag 44 is filled with flame-retardant gas. The inside of the fixed frame 51... The gas expands, pushing the sealing plate 52 upward. As the sealing plate 52 moves upward, it drives the push rod 53 upward. The push rod 53 pushes the locking plate 55 off the groove. Under the elastic force of the first spring, the insert block 54 moves to the outside of the groove. When the insert block 54 moves, it punctures the annular compression airbag 44, releasing the gas inside the annular compression airbag 44. This can extinguish the fire inside the protective sleeve 24 and prevent the cable body 1 from burning further.

[0027] The top of the push rod 53 contacts the locking plate 55. The groove is T-shaped, and the locking plate 55 and the insert block 54 can be limited by the T-shaped groove.

[0028] The force-bearing component includes a bifurcated frame 61, which is fixedly installed on the right side of the waterproof rubber 22. The air intake component includes a connecting frame 62, which is fixedly installed on the surface of the bifurcated frame 61. A fixing plate 63 is fixedly installed inside the connecting frame 62, and a one-way valve 64 is fixedly installed inside the fixing plate 63. A cover plate 65 is slidably installed on the inner wall of the connecting frame 62, and a force-bearing rod 67 is fixedly installed on the top of the cover plate 65. A second one-way valve 66 is fixedly installed inside the cover plate 65. The first one-way valve 64 can only discharge the gas inside the bifurcated frame 61, while the second one-way valve 66 can only discharge the gas between the fixing plate 63 and the cover plate 65. When 65 moves into the interior of the connecting frame 62, the gas between the fixing plate 63 and the cover plate 65 will be discharged from the one-way valve 66. When the spring force of the return spring drives the cover plate 65 and the force rod 67 to move upward, the cover plate 65 will draw in the gas between the bifurcation frame 61 and the waterproof rubber 22 through the one-way valve 64. This can improve the effect of the waterproof rubber 22 entering the interior of the bifurcation frame 61 and prevent the waterproof rubber 22 from detaching from the interior of the bifurcation frame 61 and affecting the connection effect of the cable body 1. At the same time, the bifurcation frame 61 can connect the waterproof rubber 22 and prevent the waterproof rubber 22 from leaking at the connection point and affecting the overall effect of the cable body 1.

[0029] A reset spring is provided between the cover plate 65 and the connecting frame 62. The force rod 67 is in contact with the inner wall of the protective sleeve 24. The reset spring can drive the cover plate 65 and the force rod 67 to reset.

[0030] When it is necessary to connect the cable body 1 during operation, insert one end of the cable body 1 into the inside of the mounting frame 41 to connect and install the two cable bodies 1 together, so that the waterproof rubber 22 is inserted into the inside of the bifurcation frame 61 and the waterproof rubber 22 is connected to each other. Then, rotate the bidirectional threaded rod 45 so that the bidirectional threaded rod 45 will drive the arc rod 43 to move towards each other. When the arc rod 43 moves, it will drive the extrusion block 42 to move. When the extrusion block 42 moves, it will extrude the annular extrusion airbag 44 so that the annular extrusion airbag 44 will adhere to the surface of the protective sleeve 24. When the temperature on the surface of the cable body 1 is too high, the gas inside the arc-shaped airbag 32 will expand, causing the arc-shaped airbag 32 to push the moving block 31 to move. When the moving block 31 moves, the ventilation port will move to the outside of the waterproof rubber 22, and the ventilation port will connect the inner and outer walls of the waterproof rubber 22, thereby achieving the effect of ventilation inside the waterproof rubber 22. When the cable body 1 is compressed and bends, the bending of the cable body 1 will compress the moving block 31, causing the moving block 31 to move into the interior of the waterproof rubber 22. The moving block 31 will compress the arc-shaped airbag 32, causing the gas inside the arc-shaped airbag 32 to enter the interior of the hollow frame 33 through the pipe. The increased air pressure inside the hollow frame 33 will push the movable rod 34 to move outward from the hollow frame 33, so that the movable rod 34 will support the cable body 1 and prevent the cable body 1 from bending further. When the connection of the cable body 1 is squeezed, the force rod 67 will push the cover plate 65 to move into the interior of the connecting frame 62. When the cover plate 65 moves into the interior of the connecting frame 62, the gas between the fixing plate 63 and the cover plate 65 will be discharged from the one-way valve 66. When the spring force of the return spring drives the cover plate 65 and the force rod 67 to move upward, the cover plate 65 will draw in the gas between the bifurcation frame 61 and the waterproof rubber 22 through the one-way valve 64. When the cable body 1 spontaneously combusts, the temperature inside the protective sleeve 24 will gradually rise, causing the gas inside the fixing frame 51 to expand. The gas expansion will push the sealing plate 52 to move upward. When the sealing plate 52 moves upward, it will drive the push rod 53 to move upward. The push rod 53 will push the locking plate 55 to disengage from the groove. Under the elastic force of the first spring, it will push the plug 54 to move outward from the groove. When the plug 54 moves, it will puncture the annular compression airbag 44, allowing the flame-retardant body inside the annular compression airbag 44 to enter the interior of the protective sleeve 24 to retard the flame of the cable body 1.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high current-carrying power cable, comprising a cable body (1), characterized in that: It also includes: protective devices, heat dissipation devices, connecting devices, and sealing devices; The protective device includes a support frame (21), a waterproof rubber (22), a connecting frame (23), and a protective sleeve (24). The support frame (21) is fixedly installed on the surface of the cable body (1), the waterproof rubber (22) is fixedly installed on the surface of the support frame (21), the connecting frame (23) is fixedly installed on the surface of the waterproof rubber (22), and the protective sleeve (24) is fixedly installed on the surface of the connecting frame (23). The heat dissipation device includes a movable block (31) and an arc-shaped airbag (32). The arc-shaped airbag (32) is fixedly installed on the surface of the cable body (1). The movable block (31) is slidably sleeved between the inner and outer walls of the waterproof rubber (22). The inner wall of the movable block (31) is provided with a ventilation port. The connecting device includes a docking component and a squeezing component, both of which are disposed on the surface of the protective sleeve (24). The tight-fitting device includes a force-bearing component and a suction component, both of which are disposed on the waterproof rubber (22).

2. The high current-carrying power cable according to claim 1, characterized in that: A hollow frame (33) is fixedly installed on the surface of the cable body (1), and a movable rod (34) is slidably sleeved on the surface of the hollow frame (33). The interior of the hollow frame (33) is connected to the interior of the arc-shaped airbag (32) through a pipe.

3. A high current-carrying power cable according to claim 2, characterized in that: An expansion sealing block (35) is fixedly installed at one end of the movable block (31) away from the cable body (1), and a spring is provided between the movable block (31) and the waterproof rubber (22).

4. A high current-carrying power cable according to claim 3, characterized in that: The docking assembly includes a mounting frame (41), which is fixedly mounted on the surface of the protective sleeve (24). An annular compression airbag (44) is fixedly mounted inside the mounting frame (41). The compression assembly includes a compression block (42), which is slidably sleeved inside the mounting frame (41). An arc-shaped rod (43) is fixedly mounted on the surface of the compression block (42), and a bidirectional threaded rod (45) is threadedly connected to the top of the arc-shaped rod (43).

5. A high current-carrying power cable according to claim 4, characterized in that: The bottom of the arc-shaped rod (43) is elastic, and a contact block (46) is fixedly installed on the bottom of the arc-shaped rod (43).

6. A high current-carrying power cable according to claim 5, characterized in that: The surface of the mounting frame (41) is provided with a puncture device, which includes a fixed frame (51). The fixed frame (51) is fixedly installed inside the mounting frame (41). The mounting frame (41) has a groove inside. A sealing plate (52) is slidably installed on the inner wall of the fixed frame (51). A push rod (53) is fixedly installed on the top of the sealing plate (52). An insert (54) is slidably installed inside the groove. A positioning plate (55) is slidably installed on the left side of the insert (54). A spring is provided between the insert (54) and the groove.

7. A high current-carrying power cable according to claim 6, characterized in that: The top of the push rod (53) contacts the locking plate (55), and the groove is T-shaped.

8. A high current-carrying power cable according to claim 7, characterized in that: The force-bearing component includes a bifurcated frame (61), which is fixedly installed on the right side of the waterproof rubber (22). The air intake component includes a connecting frame (62), which is fixedly installed on the surface of the bifurcated frame (61). A fixing plate (63) is fixedly installed inside the connecting frame (62). A one-way valve (64) is fixedly installed inside the fixing plate (63). A cover plate (65) is slidably installed on the inner wall of the connecting frame (62). A force-bearing rod (67) is fixedly installed on the top of the cover plate (65). A one-way valve (66) is fixedly installed inside the cover plate (65).

9. A high current-carrying power cable according to claim 8, characterized in that: A reset spring is provided between the cover plate (65) and the connecting frame (62), and the force rod (67) contacts the inner wall of the protective sleeve (24).

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