Short-time power recovery device based on lead reverse bow fracture
By using the coordination of the clamping assembly and the wire retracting frame after the jumper is broken, the jumper breaking point is quickly restored, which solves the threat of jumper breaking to the stable operation of the power grid, and improves the reliability of power supply and emergency repair efficiency.
Patent Information
- Application Number
- CN202510695221.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-08-19
AI Technical Summary
After the jumper is broken, it is easy to cause arc discharge, damage insulators or short-circuit failures. The broken jumper may swing with the wind, threatening the stable operation of the power grid. It is difficult for the existing technology to efficiently re-energize in a very short time.
By moving the clamping assembly to the jumper breakpoint under the drive of the wire retracting frame, the clamping assembly and the traction assembly are driven to fit and fix it, so as to achieve rapid power recovery and supply of the jumper breakpoint.
It realizes rapid power supply recovery after the jumper is broken, reduces the impact of environmental factors on power supply, and improves the reliability of power supply and emergency repair efficiency.
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Figure CN120511601A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of power distribution equipment, and in particular to a short-time power restoration device based on a conductor reverse bow break. Background Art
[0002] A jumper is a short-distance conductor used to connect adjacent conductors or devices. It is usually used for electrical connectivity at corners, branches, or when crossing obstacles in power lines. It can flexibly adjust the direction of the line to ensure stable current transmission while reducing the impact of mechanical stress on poles or insulators. It is usually used to connect the conductors on both sides of the load-bearing towers (tension towers, corner towers, and terminal towers). It is called a jumper, also known as a lead wire or bow wire. The material is mostly high-strength aluminum alloy or copper. The jumper surface has a non-insulated structure and must meet the conductivity and corrosion resistance requirements. It is one of the key components for the safe operation of the power grid. If the jumper has breakpoints or breaks, it will affect the stability of the power supply.
[0003] The shortcomings of the existing technology are that if a jumper breaks, it may cause arc discharge, damage insulators or adjacent equipment, and even cause a short circuit fault. In addition, if the broken jumper swings in the wind, it may touch other wires or towers, causing phase-to-phase short circuits or ground faults, threatening the stable operation of the power grid. Emergency repair personnel need to be organized to carry out emergency repairs. How to efficiently restore power to the broken jumper in a very short time is a problem that needs to be solved urgently. Summary of the Invention
[0004] The purpose of the present invention is to provide a short-time power restoration device based on the break of the conductor reverse bow. The clamping component moves to the jumper break point under the drive of the wire take-up frame, and the clamping component clamps and bites the jumper break point. The wire take-up frame then drives the clamping component and the bitten jumper to move, so that the jumper at the break point is fit and fixed with the traction component, and the wire take-up frame connects the jumper at the break point again, so that power supply is quickly restored after the jumper break.
[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a short-time power restoration device based on the break of the conductor anti-bow, comprising a conductor and a jumper provided at the bottom of the conductor; further comprising a hook member, the hook member being suspended on the conductor, and a clamping assembly for clamping the jumper symmetrically provided in the hook member, a wire harness frame for arranging the strips being provided between the two clamping assemblies, the jumper being introduced into the clamping assembly through the wire harness frame; and the limit bar is driven to separate from the clamping assembly through the wire harness frame, so that the clamping assembly clamps the jumper; further comprising a traction assembly; the traction assembly has two strokes: in the first stroke, the clamping assembly is directed along the jumper and moved to the breakpoint of the jumper for clamping by a pull rope; in the second stroke, the pull rope is rewound by the wire take-up frame in the traction assembly, so that the jumper clamped by the clamping assembly is locked and connected with the traction assembly;
[0006] As a further description of the above technical solution:
[0007] The hook member includes a hook strip, the bottom end of the hook strip is fixedly connected to a support plate, the top end of the support plate is fixedly connected to a limiting column, the limiting column is slidably connected to the limiting strip, the top end of the limiting column is fixedly connected to a welding strip, and the bottom end of the welding strip is fixedly connected to a positioning strip.
[0008] As a further description of the above technical solution:
[0009] The cable tie rack includes a cable tie rod, and the cable tie rod passes through the support plate. The top of the cable tie rod is fixedly connected to a connecting rod. One end of the cable tie rod close to the connecting rod is fixedly connected to a shift block. One end of the connecting rod is fixedly connected to a cable tie block.
[0010] As a further description of the above technical solution:
[0011] The clamping assembly includes a connecting rod, which is respectively connected to a clamping member and a locking member in a transmission manner, and the clamping member and the locking member are internally connected to a conducting member in a transmission manner.
[0012] As a further description of the above technical solution:
[0013] The conductive component includes a metal column, and the metal column is fixed on the locking component. A connecting strip is provided at one end of the metal column, and a stop strip is provided at one end of the connecting strip, and the stop strip is arranged in the clamping component.
[0014] As a further description of the above technical solution:
[0015] The traction assembly includes a connection frame, a wiring seat is symmetrically fixedly connected in the connection frame, one end of the wiring seat is fixedly connected to a metal wire, and a starter is fixedly connected between the two metal wires.
[0016] As a further description of the above technical solution:
[0017] The bottom end of the connecting frame is fixedly connected to a driving member, one end of the driving member is transmission-connected to a wire take-up frame, a pull rope is wound around the wire take-up frame, and the pull rope is fixedly connected to the linkage rod away from the wire take-up frame.
[0018] As a further description of the above technical solution:
[0019] A card slot is symmetrically opened at the bottom end of the connecting frame, and metal sheets are symmetrically fixedly connected at both ends of the card slot, and a passage is formed between the metal sheet and the terminal block. A push rod is provided in the metal sheet, and the push rod passes through the connecting frame and is fixedly connected to a cross arm, and lock bars are symmetrically fixedly connected at both ends of the cross arm.
[0020] As a further description of the above technical solution:
[0021] The take-up frame includes a winding shaft, and a pull rope is wound on the winding shaft. Gear blocks are symmetrically fixedly connected at both ends of the winding shaft. A limit plate is passed through one end of the winding shaft, and a transmission gear is symmetrically and movably provided on the limit plate.
[0022] As a further description of the above technical solution:
[0023] The driving component includes a motor, one end of the motor is fixedly connected to a motor shaft, one end of the motor shaft is fixedly connected to a motor gear, and both ends of the motor gear are respectively adapted to the transmission gear.
[0024] The present invention provides a short-time power restoration device based on a conductor reverse bow break, which has the following beneficial effects:
[0025] In the present invention, the clamping assembly moves to the jumper breakpoint under the drive of the take-up frame, and the clamping assembly clamps and engages the jumper breakpoint. The take-up frame then drives the clamping assembly and the engaged jumper to move, so that the jumper at the breakpoint is fitted and fixed to the traction assembly, and the take-up frame connects the jumper at the breakpoint again, thereby quickly restoring power supply after the jumper is broken. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a schematic structural diagram of a short-time power restoration device based on a conductor reverse bow break proposed by the present invention;
[0027] Figure 2 Schematic diagram of the pull rope structure in the present invention;
[0028] Figure 3 For the present invention Figure 2 Schematic diagram of the local structure at A in the middle;
[0029] Figure 4 Schematic diagram of the structure of the insulating rod in the present invention;
[0030] Figure 5 Schematic diagram of the structure of the hook member in the present invention;
[0031] Figure 6 It is a structural schematic diagram of the clamping assembly in the present invention;
[0032] Figure 7 For the present invention Figure 6 Schematic diagram of the local structure at C in the middle;
[0033] Figure 8 Schematic diagram of the structure of the driving member in the present invention;
[0034] Figure 9 It is a structural diagram of the connection frame in the present invention;
[0035] Figure 10 For the present invention Figure 9Schematic diagram of the local structure at point B in the middle.
[0036] Legend: 1. Bracket; 2. Mounting bar; 3. Insulation cake; 4. Wire; 5. Hook piece; 51. Hook bar; 52. Support plate; 53. Limit column; 54. Welding bar; 55. Positioning bar; 6. Wire harness; 61. Wire harness rod; 62. Connecting rod; 63. Dial block; 64. Wire harness block; 7. Pulling assembly; 701. Pull rope; 71. Snap seat; 72. Connecting frame; 721. Slot; 722. Metal sheet; 723. Push rod; 724. Cross arm; 725. Locking bar; 73. Driving part; 731. Motor; 732. Motor shaft; 733. Motor gear ;734, transmission gear;735, limit plate;74, take-up frame;741, winding shaft;742, gear block;75, terminal block;76, metal wire;77, starter;8, limit bar;9, clamping assembly;91, connecting rod;92, clamping part;921, clamping arm one;922, torsion spring one;923, clamping sleeve;924, bite bar;93, locking part;931, clamping arm two;932, torsion spring two;933, clamping block;94, conductive part;941, metal column;942, connecting bar;943, stop bar;10, insulating rod;11, jumper. DETAILED DESCRIPTION
[0037] 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.
[0038] Reference Figure 1-10 , a short-time power restoration device based on the break of a wire anti-bow, including a wire 4 and a jumper 11 provided at the bottom of the wire 4; it also includes a hook part 5, the hook part 5 is suspended on the wire 4, and a clamping assembly 9 for clamping the jumper 11 is symmetrically provided in the hook part 5, and a wire harness 6 for arranging the wires 11 is provided between the two clamping assemblies 9, and the jumper 11 is introduced into the clamping assembly 9 through the wire harness 6; and the limit bar 8 is driven to separate from the clamping assembly 9 by the wire harness 6, so that the clamping assembly 9 clamps the jumper 11; it also includes a traction assembly 7; the traction assembly 7 has two strokes: in the first stroke, the clamping assembly 9 is directed along the jumper 11 by the pull rope 701 and moves to the break point of the jumper 11 for clamping; in the second stroke, the pull rope 701 is rewound by the wire take-up frame 74 in the traction assembly 7, so that the jumper 11 clamped by the clamping assembly 9 is locked and connected with the traction assembly 7;
[0039] Specifically, the bracket 1 is a rectangular strip structure fixed on the electric pole, and multiple mounting strips 2 are fixed on the bracket 1. Both ends of the mounting strips 2 are fixedly connected to wires 4. Multiple insulating cakes 3 are fixed to the wires 4 near the mounting strips 2. The wires 4 are fixedly connected through jumpers 11 between the two wires 4. When the jumper 11 is disconnected, the hook member 5 is hung on the wire 4 by holding the insulating rod 10, and the hook member 5 is driven by the insulating rod 10 to fit the connection between the jumper 11 and the wire 4. The rotating insulating rod 10 drives the connected wire harness 6 to rotate, and the wire harness 6 is rotated to hook the disconnected jumper 11. The insulating rod 10 is pulled to drive the wire harness 6 to move downward, so that the wire harness 6 guides the jumper 11 into the clamping assembly 9. At the same time, the cable tie frame 6 drives the limit bar 8 to separate from the clamping assembly 9, so that the clamping assembly 9 clamps the jumper 11, and finally starts the mobile control terminal to control the take-up frame 74 located in the traction assembly 7 to drive the pull rope 701 to reel in, and the clamping assembly 9 connected to the pull rope 701 moves in a directional manner along the jumper 11. When the clamping assembly 9 moves to the breakpoint of the jumper 11 under the drive of the take-up frame 74, the clamping assembly 9 clamps and engages the breakpoint of the jumper 11, and then drives the clamping assembly 9 and the engaged jumper 11 to move through the take-up frame 74, so that the jumper 11 at the breakpoint is fitted and fixed with the traction assembly 7, so that the take-up frame 74 connects the jumper 11 at the breakpoint again, thereby improving the efficiency of emergency repairs at the breakpoint of the jumper 11.
[0040] The hook member 5 includes a hook strip 51, the bottom end of the hook strip 51 is fixedly connected to a support plate 52, the top end of the support plate 52 is fixedly connected to a limiting column 53, the limiting column 53 is slidably connected to the limiting strip 8, the top end of the limiting column 53 is fixedly connected to a welding strip 54, and the bottom end of the welding strip 54 is fixedly connected to a positioning strip 55;
[0041] Specifically, the hook member 5 includes a hook bar 51 in a "J"-shaped structure that is hung on the wire 4. The support plate 52 fixedly connected to the hook bar 51 cooperates with the welding bar 54, so that the limiting column 53 between the welding bar 54 and the support plate 52 is used to limit the movement direction of the limiting bar 8. The positioning bar 55 fixedly connected to the welding bar 54 is used to limit the state of the clamping assembly 9 when it is engaged with the limiting bar 8;
[0042] The cable tie rack 6 includes a cable tie rod 61, and the cable tie rod 61 passes through the support plate 52. The top of the cable tie rod 61 is fixedly connected to a connecting rod 62. The end of the cable tie rod 61 close to the connecting rod 62 is fixedly connected to a shift block 63. One end of the connecting rod 62 is fixedly connected to a cable tie block 64.
[0043] Specifically, the cable tie rod 61 passes through the support plate 52 and is fixed on the insulating rod 10. The rotating insulating rod 10 drives the connecting rod 62 fixedly connected to the top of the cable tie rod 61 to drive the cable tie block 64 to move in a directional manner, so that the jumper 11 is introduced into the clamping assembly 9 through the cable tie block 64 under the drive of the insulating rod 10. The shift block 63 fixedly connected to the cable tie rod 61 drives the limit bar 8 to move in a directional manner, so that the limit bar 8 is separated from the clamping assembly 9, which facilitates the clamping assembly 9 to clamp the jumper 11, thereby improving the efficient clamping of the disconnected jumper 11, so as to improve the efficiency of the short-term repair of the disconnected jumper 11.
[0044] The clamping assembly 9 includes a connecting rod 91, which is respectively connected to a clamping member 92 and a locking member 93, and a transmission member 94 is connected to the clamping member 92 and the locking member 93. The transmission member 94 includes a metal column 941, and the metal column 941 is fixed to the locking member 93. The metal column 941 has a connecting bar 942 at one end, and a stop bar 943 at one end of the connecting bar 942. The stop bar 943 is arranged in the clamping member 92.
[0045] Specifically, the clamping component 9 is connected to the locking component 93 by a connecting rod 91, and the clamping arm 1 921 is connected symmetrically in the clamping component 92. The two clamping arms 1 921 are fixedly connected by a torsion spring 1 922, so that the clamping sleeve 923 fixedly connected at one end of the clamping arm 1 921 clamps the jumper 11. The clamping arm 2 931 is symmetrically connected in the locking component 93, and the two clamping arms 2 931 are fixedly connected by a torsion spring 2 932. The clamping block 933 fixedly connected by the clamping arm 2 931 is used to Fixed metal column 941, when the locking part 93 moves to the disconnection point of jumper 11, the clamping block 933 fits the two separated metal columns 941 together under the action of the torsion spring 2 932 between the clamping arms 931, and the metal column 941 drives the stop bar 943 to move in a directional manner through the connecting bar 942. The initial position of the stop bar 943 is aligned with the bite bar 924. When the clamping block 933 is closed, the stop bar 943 and the bite bar 924 are misaligned and separated, so that the bite bar 924 bites and clamps the jumper 11, thereby improving the stability of the clamping at the disconnection point of the jumper 11.
[0046] The traction assembly 7 includes a connecting frame 72, in which a terminal block 75 is symmetrically fixedly connected, one end of the terminal block 75 is fixedly connected to a metal wire 76, and a starter 77 is fixedly connected between the two metal wires 76; (the starter 77 adopts a line switch that can be controlled by a mobile end in the prior art) the bottom end of the connecting frame 72 is fixedly connected to a driving member 73, one end of the driving member 73 is transmission-connected to a take-up rack 74, a pull rope 701 is wound around the take-up rack 74, and the pull rope 701 is fixedly connected to the connecting rod 91 away from the take-up rack 74, and a card slot 721 is symmetrically opened at the bottom end of the connecting frame 72, and metal sheets 722 are symmetrically fixedly connected at both ends of the card slot 721, and the metal sheet 722 forms a passage with the terminal block 75. , a push rod 723 is provided in the metal sheet 722, and the push rod 723 passes through the connecting frame 72 and is fixedly connected to the cross arm 724, and the two ends of the cross arm 724 are symmetrically fixedly connected to the lock bar 725; the wire take-up frame 74 includes a winding shaft 741, and a pull rope 701 is wound around the winding shaft 741, and the two ends of the winding shaft 741 are symmetrically fixedly connected to the gear block 742, and one end of the winding shaft 741 passes through a limit plate 735, and the limit plate 735 is symmetrically and movably provided with a transmission gear 734; the driving member 73 includes a motor 731, one end of the motor 731 is fixedly connected to the motor shaft 732, and one end of the motor shaft 732 is fixedly connected to the motor gear 733, and the two ends of the motor gear 733 are respectively adapted to the transmission gear 734;
[0047] Specifically, the connecting frame 72 in the traction assembly 7 is a rectangular frame structure, wherein the motor 731 rotates clockwise or counterclockwise to drive the take-up frame 74 to move respectively, and the pull rope 701 wound around the winding shaft 741 in the take-up frame 74 is wound under the drive of the motor 731, so that the clamping assembly 9 connected to the pull rope 701 moves in a directional manner along the jumper 11, and the clamping assembly 9 is pulled to the breakpoint of the jumper 11 by the pull rope 701, so that the traction assembly 7 can adjust the position of the clamping assembly 9 according to the breakpoint of the jumper 11. When the motor 731 drives the motor gear 733 fixedly connected to the motor shaft 732 to rotate clockwise, the transmission gear 734 movably connected on the limit plate 735 engages with the winding shaft 741, and the winding shaft 741 is driven to rotate under the action of the motor gear 733. The transmission gear 734 set on the other side of the motor gear 733 has an opposite operating stroke, so that the take-up rack 74 is wound in sequence, so that the traction component 7 can handle breakpoints at any position, thereby improving the convenience and flexibility of use.
[0048] Working principle: When the jumper 11 is disconnected, the hook member 5 is hung on the wire 4 by holding the insulating rod 10. The limiting column 53 between the welding bar 54 and the support plate 52 is used to limit the movement direction of the limiting bar 8. The positioning bar 55 fixedly connected to the welding bar 54 is used to limit the state when the clamping assembly 9 and the limiting bar 8 are engaged. The insulating rod 10 drives the hook member 5 to fit the connection between the jumper 11 and the wire 4. The rotating insulating rod 10 drives the connected cable tie 6 to rotate, rotates the cable tie 6 and hooks the disconnected jumper 11, and pulls the insulating rod 10. The rod 10 drives the cable tie rack 6 to move downward, so that the cable tie rack 6 guides the jumper 11 into the clamping assembly 9. At the same time, the cable tie rack 6 drives the limit bar 8 to separate from the clamping assembly 9. The cable tie rod 61 passes through the support plate 52 and is fixed on the insulating rod 10. The rotating insulating rod 10 drives the connecting rod 62 fixedly connected to the top of the cable tie rod 61 to drive the cable tie block 64 to move in a directional manner, so that the jumper 11 is introduced into the clamping assembly 9 through the cable tie block 64 under the drive of the insulating rod 10. The shift block 63 fixedly connected to the cable tie rod 61 drives the limit bar 8 to move in a directional manner. The limit bar 8 is separated from the clamping assembly 9, so that the clamping assembly 9 clamps the jumper 11. When the locking member 93 moves to the disconnected position of the jumper 11, the clamping block 933 fits the two separated metal posts 941 together under the action of the torsion spring 2 932 between the clamping arms 931. The metal post 941 drives the stop bar 943 to move in a directional manner through the connecting bar 942. The initial position of the stop bar 943 is aligned with the bite bar 924. When the clamping block 933 is closed, the stop bar 943 is dislocated and separated from the bite bar 924, so that the bite bar 924 bites the jumper 11. The wire take-up frame 74 is driven by the pull rope 701 to reel in the wire rope 701, and the clamping assembly 9 connected to the pull rope 701 moves in a directional manner along the jumper 11. When the clamping assembly 9 moves to the breakpoint of the jumper 11 under the drive of the wire take-up frame 74, the clamping assembly 9 clamps and engages the breakpoint of the jumper 11, and then drives the clamping assembly 9 and the engaged jumper 11 to move through the wire take-up frame 74, so that the jumper 11 at the breakpoint is fitted and fixed to the traction assembly 7, so that the wire take-up frame 74 connects the jumper 11 at the breakpoint again.
[0049] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and concepts of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A short-time power restoration device based on conductor reverse bow breakage, characterized in that: Including a wire and a jumper wire at the bottom of the wire; The device also includes a hook member, which is suspended on the wire. Clamping assemblies for clamping jumpers are symmetrically arranged inside the hook member. A wire harness rack for arranging wires is provided between the two clamping assemblies. The jumpers are guided into the clamping assemblies through the wire harness rack. The limit strip is separated from the clamping assemblies by the wire harness rack, so that the clamping assemblies clamp the jumpers. It also includes a traction assembly; the traction assembly has two strokes: in the first stroke, the clamping assembly is moved along the jumper wire through the pull rope and moved to the breakpoint of the jumper wire for clamping; in the second stroke, the pull rope is rewound again through the take-up rack inside the traction assembly, so that the jumper wire clamped by the clamping assembly is locked and connected with the traction assembly.
2. The short-time power restoration device based on conductor reverse bow breakage according to claim 1 is characterized in that: The hook member includes a hook strip, the bottom end of the hook strip is fixedly connected to a support plate, the top end of the support plate is fixedly connected to a limiting column, the limiting column is slidably connected to the limiting strip, the top end of the limiting column is fixedly connected to a welding strip, and the bottom end of the welding strip is fixedly connected to a positioning strip.
3. The short-time power restoration device based on conductor reverse bow breakage according to claim 1 is characterized in that: The cable tie rack includes a cable tie rod, and the cable tie rod passes through the support plate. The top of the cable tie rod is fixedly connected to a connecting rod, one end of the cable tie rod close to the connecting rod is fixedly connected to a shift block, and one end of the connecting rod is fixedly connected to a cable tie block.
4. The short-time power restoration device based on conductor reverse bow breakage according to claim 1 is characterized in that: The clamping assembly comprises a connecting rod, the connecting rod is respectively connected to the clamping part and the locking part, and the clamping part and the locking part are internally connected to the conducting part.
5. The short-time power restoration device based on conductor reverse bow breakage according to claim 4 is characterized in that: The conductive part includes a metal column, and the metal column is fixed on the locking part. A connecting strip is provided at one end of the metal column, and a stop strip is provided at one end of the connecting strip, and the stop strip is arranged in the clamping part.
6. The short-time power restoration device based on conductor reverse bow breakage according to claim 1 is characterized in that: The traction component includes a connection frame, in which a wiring seat is symmetrically fixedly connected, one end of the wiring seat is fixedly connected to a metal wire, and a starter is fixedly connected between the two metal wires.
7. The short-time power restoration device based on conductor reverse bow breakage according to claim 6 is characterized in that: The bottom end of the connecting frame is fixedly connected to a driving member, one end of the driving member is transmission-connected to a wire take-up frame, a pull rope is wound around the wire take-up frame, and the pull rope is fixedly connected to the linkage rod away from the wire take-up frame.
8. The short-time power restoration device based on conductor reverse bow breakage according to claim 6 is characterized in that: The bottom end of the connecting frame is symmetrically provided with a card slot, and metal sheets are symmetrically fixedly connected at both ends of the card slot, and the metal sheet and the terminal block form a passage. A push rod is provided in the metal sheet, and the push rod passes through the connecting frame and is fixedly connected to a cross arm, and lock bars are symmetrically fixedly connected at both ends of the cross arm.
9. The short-time power restoration device based on conductor reverse bow breakage according to claim 7 is characterized in that: The take-up frame includes a winding shaft, and a pull rope is wound on the winding shaft. Gear blocks are symmetrically fixedly connected at both ends of the winding shaft. A limit plate is passed through one end of the winding shaft, and a transmission gear is symmetrically and movably provided on the limit plate.
10. The short-time power restoration device based on conductor reverse bow breakage according to claim 7 is characterized in that: The driving component includes a motor, one end of the motor is fixedly connected to a motor shaft, one end of the motor shaft is fixedly connected to a motor gear, and both ends of the motor gear are respectively adapted to the transmission gear.