A cable wiring device for electric power engineering

Abstract

The present invention relates to the field of power engineering, and particularly to a cable wiring device for power engineering. A cable wiring device for power engineering that is unrestricted and convenient to use is provided. A cable wiring device for power engineering includes a mounting base, a movable sleeve, a wire splitting component, etc.; a movable sleeve that can be opened and closed is fixedly connected to the mounting base. The movable sleeve is provided with fastening holes for fixing after installation. A wire splitting component for connecting the main cable is provided in the middle of the movable sleeve. An auxiliary hole for assisting the wire splitting component to install branch lines is provided on the mounting base; the wire splitting component further includes a wiring ring, a second nitrogen spring, a limiting ring, a wiring terminal, a convex block, a contact plate, a fastening bolt, and a compression spring. By adopting the wire splitting component, during the laying process of the branch and main lines, it is not necessary to cut off the main line, and the laying of the branch and main circuits can be completed conveniently and quickly. Moreover, the installation position can be selected according to the on-site line laying situation, greatly improving the installation flexibility.

Description

Technical Field

[0001] The present invention relates to the field of power engineering, and particularly to a cable wiring device for power engineering. Background Art

[0002] A cable is a device for transmitting electrical energy or signals, usually composed of several or several groups of wires. Among them, power cables play an important role in power transmission in power engineering. During the process of laying cable facilities, usually, the main cable is responsible for the main power transmission road in the power supply area, and the secondary cable serves as the power branch line of the main cable to supply power to each user in the power consumption area.

[0003] In the connection of circuit branches, usually, technical means such as directly winding branch wires, distribution boxes or prefabricated branch cables on the main cable are used for circuit branching. However, the above several technical means all have certain defects. Firstly, the direct winding method is only suitable for temporary use, and there are potential safety hazards in long-term use. Secondly, the existing distribution box structure is relatively simple. After the main cable enters the distribution box, wiring is carried out in a one-in-multiple-out manner. Since the main cable needs to be cut off for wiring during wiring, the main cable cannot be continued. Thirdly, the prefabricated branch cable is a cable in which the factory prefabricates branch wires according to the user's design drawings when producing the main cable. It can only be used in the specified line direction, the position of the branch wire cannot be adjusted, and the length may not be sufficient during formal use. Summary of the Invention

[0004] In order to overcome the shortcomings that the existing technical means for connecting circuit branches cannot meet the actual use requirements, the purpose of the present invention is to provide a cable wiring device for power engineering that is unrestricted and convenient to use.

[0005] Technical Solution: A cable wiring device for power engineering includes a mounting base, a movable sleeve and a wire splitting component. A movable sleeve that can be opened and closed is fixedly connected to the mounting base. The movable sleeve is provided with fastening holes for fixing after the movable sleeve is installed. A wire splitting component for connecting the main cable is provided in the middle of the movable sleeve. An auxiliary hole for assisting the installation of branch lines by the wire splitting component is provided on the mounting base; the wire splitting component further includes a wiring ring, a second nitrogen spring, a limiting ring, a wiring terminal, a convex block, a contact plate, a fastening bolt and a compression spring. A wiring ring that follows the opening of the movable sleeve is provided in the middle of the outer side of the movable sleeve. A plurality of through holes are provided on the wiring ring. A plurality of pairs of second nitrogen springs are fixedly connected to the outer side of the wiring ring. The ends of each pair of second nitrogen springs are commonly fixedly connected to the limiting ring. A limiting groove is provided in the limiting ring. The wiring terminal is movably connected in the through hole. A compression spring is provided between the wiring terminal and the through hole. A convex block is fixedly connected to the upper part of the wiring terminal. The convex block is in contact with the limiting groove in a matching manner. A contact plate is provided at the bottom of the wiring terminal. The upper part of the wiring terminal is threadedly connected to the fastening bolt.

[0006] In a preferred embodiment of the present invention, there is also a wire-opening component. At the bottom of the movable sleeve, there is a wire-opening component for laterally opening the cable insulation layer. The wire-opening component includes a sliding plate, a cutting knife, and a pulling ring. The sliding plate is slidably connected to the inner bottom of the movable sleeve. One side of the sliding plate is fixedly connected to the cutting knife, and the other side is provided with a pulling ring.

[0007] In a preferred embodiment of the present invention, the size of the cutting knife is adapted to the thickness of the cable insulation layer.

[0008] In a preferred embodiment of the present invention, there is also a wire-stripping mechanism. On the movable sleeve, there is a wire-stripping mechanism for stripping the cable insulation layer; the wire-stripping mechanism includes an arc-shaped angle plate, a first nitrogen spring, a cutting knife, and a C-shaped rod. The arc-shaped angle plates are slidably connected to the cross-sections on both sides of the top of the movable sleeve. The first nitrogen spring is provided on the arc-shaped angle plate. Circular sliding grooves are provided on the cross-sections on both sides of the movable sleeve. The end of the first nitrogen spring is connected to the cutting knife through the C-shaped rod, and a storage opening for storing the cutting knife is provided on the upper part of the cross-section.

[0009] In a preferred embodiment of the present invention, there is also a locking mechanism. On the mounting seat, there is a locking mechanism for limiting the cable insulation layer when it is stripped. The locking mechanism includes an L-shaped sliding rod and an auxiliary limiting mechanism. Square sliding grooves are provided on the tops of both sides of the mounting seat. The L-shaped sliding rod is slidably connected in the square sliding groove. Limiting holes are symmetrically opened on the cross-sections on both sides of the movable sleeve. The L-shaped sliding rod is in contact with the limiting holes in a matching manner; an auxiliary limiting mechanism for automatically limiting in cooperation with the locking mechanism is provided on the mounting seat.

[0010] In a preferred embodiment of the present invention, the auxiliary limiting mechanism includes a cylindrical spring, a guide tube, a movable plate, a pulling rope, a connecting plate, and a limiting block. A cylindrical spring is provided between the L-shaped sliding rod and the square sliding groove. Guide tubes are symmetrically arranged on the front and back sides of the mounting seat on the left and right. The movable plate is slidably connected to the side of the mounting seat. The connecting plate is fixedly connected to the movable plate. One end of the pulling rope is fixedly connected to the L-shaped sliding rod, and the other end passes through the guide tube and is fixedly connected to the movable plate. A limiting block is fixedly connected to the side of the sliding plate opposite to the pulling ring at the bottom. The limiting block is in contact with the movable plate in a matching manner.

[0011] In a preferred embodiment of the present invention, the contact surfaces of the limiting block and the movable plate are designed at an inclined angle to each other.

[0012] In a preferred embodiment of the present invention, there is also a power-off mechanism. On the wire-splitting component, there is a power-off mechanism for synchronously powering off the wiring terminals; the power-off mechanism includes a sliding column, a movable ring, and a pulling frame. The sliding column is fixedly connected to the bottom of the limiting ring. The movable rings are symmetrically slidably connected to the cross-section on the front side of the wiring ring. Arc-shaped grooves adapted to the sliding column are provided on the movable rings. The pulling frame is jointly connected to the movable rings.

[0013] Compared with the prior art, the present invention has the following advantages: By adopting a wire splitting component, during the laying process of the branch lines, it is not necessary to cut off the main line, and the branch circuit can be laid conveniently and quickly. Moreover, the installation position can be selected according to the on-site wiring situation, greatly improving the installation flexibility.

[0014] With the cooperation of the wire opening component and the wire stripping mechanism, the cable insulation layer can be stripped without the aid of wire stripping tools, and the internal wire cores will not be damaged, further reducing the complexity of the branch line installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a first perspective three-dimensional structure schematic diagram of the present invention.

[0016] Figure 2 It is a second perspective three-dimensional structure schematic diagram of the present invention.

[0017] Figure 3 It is a three-dimensional structure schematic diagram of the wire opening component of the present invention.

[0018] Figure 4 It is a three-dimensional structure schematic diagram of the wire stripping mechanism of the present invention.

[0019] Figure 5 It is a three-dimensional structure schematic diagram of the wire splitting component of the present invention.

[0020] Figure 6 It is a three-dimensional structure schematic diagram of the power-off mechanism of the present invention.

[0021] Figure 7 It is a partially disassembled three-dimensional structure schematic diagram of the wire splitting component of the present invention.

[0022] Figure 8 It is a three-dimensional structure schematic diagram of the locking mechanism of the present invention.

[0023] Figure 9 It is a magnified three-dimensional structure schematic diagram of part A of the present invention.

[0024] Figure 10 It is a first perspective three-dimensional structure schematic diagram of the auxiliary limiting mechanism of the present invention.

[0025] Figure 11 It is a second perspective three-dimensional structure schematic diagram of the auxiliary limiting mechanism of the present invention.

[0026] In the figure: 1, mounting base; 2, movable sleeve; 3, fastening hole; 4, wire-opening component, 41, sliding plate, 42, cutting knife, 43, pull ring; 5, wire-stripping mechanism, 51, circular chute, 52, storage opening, 53, arc-shaped corner plate, 54, first nitrogen spring, 55, cutter, 56, C-shaped rod; 6, wire-splitting component, 61, wiring ring, 62, through hole, 63, second nitrogen spring, 631, limiting ring, 64, limiting groove, 65, wiring terminal, 66, convex block, 67, contact plate, 68, fastening bolt, 69, compression spring; 7, locking mechanism, 71, square chute, 72, L-shaped sliding rod, 73, limiting hole; 8, auxiliary limiting mechanism, 81, cylindrical spring, 82, guiding tube, 83, movable plate, 84, pull rope, 85, connecting plate, 86, limiting block; 9, power-off mechanism, 91, sliding column, 92, movable ring, 93, arc-shaped groove, 94, pulling frame; 10, auxiliary hole. Detailed implementation mode

[0027] Although the present invention may be described in relation to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention. Those of ordinary skill in the art will recognize that terms such as "above", "below", "upward", "downward", etc. are used to describe the drawings and do not represent a limitation on the scope of the present invention defined by the appended claims. Any numerical labels such as "first" or "second" are merely illustrative and are not intended to limit the scope of the present invention in any way.

[0028] Embodiment 1

[0029] A cable wiring device for electric power engineering, as Figures 1 - 7As shown, it includes a mounting base 1, a movable sleeve 2 and a branching component 6. The mounting base 1 is fixed with a movable sleeve 2 that can be opened and closed. The inner diameter of the movable sleeve 2 is adapted to the cable diameter and the inner wall is provided with a non-slip rubber layer. The movable sleeve 2 can be opened in half and is an insulator. The side of the movable sleeve 2 that can be opened is provided with a fastening hole 3 for fixing the movable sleeve 2 after installation. The fastening hole 3 can be used to tighten and fix the movable sleeve 2 by a bolt. The middle part of the movable sleeve 2 is provided with a branching component 6 for connecting the main cable. The mounting base 1 is provided with an auxiliary hole 10 for installing a branch line of an auxiliary branch line assembly 6; the branch line assembly 6 also includes a wiring ring 61, a second nitrogen spring 63, a limit ring 631, a wiring terminal 65, a bump 66, a touch plate 67, a fastening bolt 68 and a compression spring 69. The middle part of the outer side of the movable sleeve 2 is fixedly connected to the wiring ring 61 that can follow the opening of the movable sleeve 2. The wiring ring 61 is provided with 8 through holes 62. The outer side of the wiring ring 61 is fixedly connected to 8 pairs of second nitrogen springs 63. The ends of each pair of second nitrogen springs 63 are fixedly connected together. A limiting ring 631 is provided, and the limiting ring 631 is located above the through hole 62. An inverted "T" shaped limiting groove 64 is provided in the limiting ring 631. A terminal 65 is movably connected in the through hole 62. The terminal 65 is insulated on the outside and has a copper core tube on the inside. A compression spring 69 is provided between the terminal 65 and the through hole 62. The elastic force of the compression spring 69 is less than that of the second nitrogen spring 63. In the initial state, the compression spring 69 lifts the terminal 65. The upper part of the terminal 65 is welded with a bump 66. The bump 66 and the limiting ring 631 are connected. The groove 64 is in contact with each other, and the bottom of the terminal 65 is rotatably connected to the contact plate 67. The contact plate 67 uses a copper conductor to connect the copper core tube. The upper part of the terminal 65 is threadedly connected to the fastening bolt 68. After the core of the branch line is inserted into the terminal 65, the fastening bolt 68 is tightened to achieve the effect of fastening and preventing it from falling off. The fastening bolt 68 at the bottom can be tightened through the auxiliary hole 10. If the terminal 65 is pressed down and rotated, the protrusion 66 will be stuck in the limit groove 64, and at this time the touch plate 67 can contact the core and energize.

[0030] When the main line needs to be connected to the branch line, select a suitable connection point on the main line without cutting the main line. Strip off a part of the insulation layer on the main line to expose the wire core, then open the movable sleeve 2, align the branch line component 6 part with the wire core part, tighten the bolts in the fastening hole 3 to fix it, and fix the mounting base 1 to the wall or telephone pole with bolts. Then, connect the corresponding number of branch lines to the branch line component 6 according to the actual number of branch lines required, so as to complete the laying of the branch circuit quickly and conveniently, and the installation location can be selected according to the on-site line laying situation, which greatly improves the installation flexibility.

[0031] Example 2

[0032] On the basis of Example 1, Figure 1 、 Figure 3As shown in the figure, it further includes a wire-opening component 4. At the bottom of the movable sleeve 2, there is a wire-opening component 4 for laterally opening the cable insulation layer. The wire-opening component 4 includes a sliding plate 41, a cutting knife 42 and a pull ring 43. The sliding plate 41 is slidably connected to the inner bottom of the movable sleeve 2. One side of the sliding plate 41 is welded with the cutting knife 42, and the other side is movably connected to the pull ring 43. The size of the cutting knife 42 is adapted to the thickness of the cable insulation layer to avoid scratching the inner wire core of the cable. After pulling the pull ring 43, the sliding plate 41 slides to laterally cut a notch on the cable insulation layer that is slightly shorter than the length of the movable sleeve 2.

[0033] As Figure 1 , Figure 4 As shown in the figure, it further includes a wire-stripping mechanism 5. On the movable sleeve 2, there is a wire-stripping mechanism 5 for stripping the cable insulation layer; the wire-stripping mechanism 5 includes an arc-shaped angle plate 53, a first nitrogen spring 54, a cutting knife 55 and a C-shaped rod 56. The arc-shaped angle plates 53 are slidably connected to the cross-sections on both sides of the top of the movable sleeve 2. The first nitrogen spring 54 is fixedly connected to the arc-shaped angle plate 53. Circular sliding grooves 51 are provided on the cross-sections on both sides of the movable sleeve 2. The end of the first nitrogen spring 54 is connected to the cutting knife 55 through the C-shaped rod 56. A storage opening 52 for storing the cutting knife 55 is provided in the upper part of the cross-section. In the normal state, the first nitrogen spring 54 pushes the cutting knife 55 up into the storage opening 52. When wire stripping is required, press the C-shaped rod 56 so that the cutting knife 55 cuts into the cable insulation layer. When the C-shaped rod 56 is pressed to the limit distance, it will not contact the inner wire core of the cable. After the cutting knife 55 cuts into the insulation layer, pull the C-shaped rod 56 so that the arc-shaped angle plate 53 and the cutting knife 55 slide along the cross-section of the movable sleeve 2. The cutting knife 55 will cut along the circumference of the cable. After cutting is completed, open the movable sleeve 2, and after taking out the cable, break off the cut cable insulation layer.

[0034] As Figure 1 , Figure 8 , Figure 9 As shown in the figure, it further includes a locking mechanism 7. On the mounting base 1, there is a locking mechanism 7 for limiting the position when the cable insulation layer is stripped. The locking mechanism 7 includes an L-shaped sliding rod 72 and an auxiliary limiting mechanism 8. Square sliding grooves 71 are opened at the top of both sides of the mounting base 1. The L-shaped sliding rod 72 is slidably connected in the square sliding grooves 71. Symmetric limiting holes 73 are opened at the cross-sections of the other half of the movable sleeve 2 that can be opened. After pushing the L-shaped sliding rod 72, it will pass through the limiting holes 73, making the movable sleeve 2 unable to be opened; an auxiliary limiting mechanism 8 for cooperating with the locking mechanism 7 for automatic limiting is provided on the mounting base 1.

[0035] As Figure 1 , Figure 10 , Figure 11As shown, the auxiliary limiting mechanism 8 includes a cylindrical spring 81, a guide tube 82, a movable plate 83, a pull rope 84, a connecting plate 85 and a limit block 86. The cylindrical spring 81 is fixed between the L-shaped slide bar 72 and the square slide groove 71. In the initial state, the cylindrical spring 81 is in a stretched state. The guide tubes 82 are fixed to the front and rear sides of the mounting seat 1 symmetrically. The side of the mounting seat 1 is slidably connected to the movable plate 83. The connecting plate 85 is fixed to the movable plate 83. One end of the pull rope 84 is fixed to the L-shaped slide bar 72, and the other end passes through the guide tube 82 and is fixed to the movable plate 83. The bottom of the sliding plate 41 is relative to the pull ring 43. A limit block 86 is fixed to one side, and the limit block 86 is in contact with the movable plate 83. The contact surfaces of the limit block 86 and the movable plate 83 are designed to be inclined at angles to each other. After the sliding plate 41 is pulled, the limit block 86 slides and disengages along the inclined surface of the movable plate 83. At this time, the stretched cylindrical spring 81 is reset and pulls the movable plate 83 up. While the cylindrical spring 81 is reset, it drives the L-shaped slide bar 72 to slide and pass through the limit hole 73. After the sliding plate 41 is reset, the limit block 86 slides along the inclined surface of the movable plate 83 and pushes the sliding plate 83 downward, and the pull rope 84 pulls the L-shaped slide bar 72 out of the limit hole 73.

[0036] like Figure 1 、 Figure 6 As shown, it also includes a power-off mechanism 9. The branch line assembly 6 is provided with a power-off mechanism 9 for synchronously powering off the terminal 65; the power-off mechanism 9 includes a sliding column 91, a movable ring 92 and a pulling frame 94. The bottom of the limiting ring 631 is fixedly connected to the sliding column 91, and the movable ring 92 is symmetrically slidably connected on the front cross-section of the terminal ring 61. The movable ring 92 is provided with an arc-shaped groove 93 adapted to the sliding column 91, and the movable ring 92 is jointly connected to the pulling frame 94. Use a large force to rotate the pulling frame 94 to one side, and the movable ring 92 slides along the arc surface of the terminal ring 61, and the sliding column 91 slides along the groove surface of the arc groove 93. After sliding to the top surface of the movable ring 92, the entire limiting ring 631 is lifted up, and the second nitrogen spring 63 is stretched, so that the terminal 65 is also lifted up. After lifting up, the contact plate 67 is disengaged from the internal wire core, thereby completing the simultaneous disconnection of all the terminal 65.

[0037] In order to prevent the wire core from being damaged during the insulation stripping process on the main line, the movable sleeve 2 is opened and put on the cable and the movable sleeve 2 is compacted. The wire-opening component 4 first pierces the cable insulation layer, and then the wire-opening component 4 is pulled to open a hole in the cable insulation layer horizontally. The locking mechanism 7 then locks the movable sleeve 2, and then the cable insulation layer is cut along the arc surface through the wire stripping mechanism 5. After the operation is completed, the wire-opening component 4 and the wire stripping mechanism 5 are reset, the movable sleeve 2 is opened, and the stripped cable insulation layer is taken out, and then the corresponding installation is performed. In the above method, the cable insulation layer can be stripped without the help of a wire stripping tool, and the internal wire core will not be damaged.

[0038] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all modifications and equivalent structures and functions.

Claims

1. A cable connection device for electric power engineering, comprising a mounting base (1) and a movable sleeve (2), wherein the mounting base (1) is fixedly connected to the movable sleeve (2) which can be opened and closed, and the movable sleeve (2) is provided with a fastening hole (3) for fixing the movable sleeve (2) after installation, wherein: The utility model also includes a branching assembly (6), wherein the middle portion of the movable sleeve (2) is provided with a branching assembly (6) for connecting the main cable, and the mounting seat (1) is provided with an auxiliary hole (10) for installing the branch line of the auxiliary branching assembly (6); the branching assembly (6) also includes a wiring ring (61), a second nitrogen spring (63), a limit ring (631), a wiring terminal (65), a protrusion (66), a touch plate (67), a fastening bolt (68) and a compression spring (69), and the middle portion of the outer side of the movable sleeve (2) is provided with a wiring ring (61) which opens following the movable sleeve (2), and the wiring ring (61) is provided with a plurality of through holes (62 ), a plurality of pairs of second nitrogen springs (63) are fixedly connected to the outside of the wiring ring (61), and the ends of each pair of second nitrogen springs (63) are fixedly connected to a limiting ring (631), a limiting groove (64) is provided in the limiting ring (631), a wiring terminal (65) is movably connected in the through hole (62), a compression spring (69) is provided between the wiring terminal (65) and the through hole (62), a protrusion (66) is fixedly connected to the upper part of the wiring terminal (65), the protrusion (66) is in contact with the limiting groove (64), a touch plate (67) is provided at the bottom of the wiring terminal (65), and a threaded fastening bolt (68) is connected to the upper part of the wiring terminal (65).

2. A cable connection device for electric power engineering according to claim 1, characterized in that: The invention also includes a wire-opening assembly (4), wherein the bottom of the movable sleeve (2) is provided with a wire-opening assembly (4) for horizontally opening the insulation layer of the cable, wherein the wire-opening assembly (4) includes a sliding plate (41), a cutter (42) and a pull ring (43), and the bottom of the movable sleeve (2) is slidably connected to the sliding plate (41), the cutter (42) is fixedly connected to one side of the sliding plate (41), and the other side is provided with a pull ring (43).

3. A cable connection device for electric power engineering according to claim 2, characterized in that: The size of the scoring knife (42) is adapted to the thickness of the cable insulation layer.

4. A cable connection device for electric power engineering according to claim 2, characterized in that: The invention also includes a stripping mechanism (5), wherein the stripping mechanism (5) for stripping the insulation layer of the cable is provided on the movable sleeve (2); the stripping mechanism (5) includes an arc angle plate (53), a first nitrogen spring (54), a cutter (55) and a C-shaped rod (56); the cross sections on both sides of the top of the movable sleeve (2) are slidably connected to the arc angle plate (53); the first nitrogen spring (54) is provided on the arc angle plate (53); circular sliding grooves (51) are provided on the cross sections on both sides of the movable sleeve (2); the end of the first nitrogen spring (54) is connected to the cutter (55) through the C-shaped rod (56); and a storage port (52) for storing the cutter (55) is provided on the upper part of the cross section.

5. A cable connection device for electric power engineering according to claim 2 or 4, characterized in that: The utility model further comprises a locking mechanism (7), wherein the mounting seat (1) is provided with a locking mechanism (7) for limiting the position when the cable insulation layer is stripped, the locking mechanism (7) comprising an L-shaped slide bar (72) and an auxiliary limiting mechanism (8), square slide grooves (71) are provided on the top of both sides of the mounting seat (1), the L-shaped slide bar (72) is slidably connected in the square slide grooves (71), and limiting holes (73) are symmetrically opened at the cross section of both sides of the movable sleeve (2), and the L-shaped slide bar (72) is in contact with the limiting hole (73); and an auxiliary limiting mechanism (8) is provided on the mounting seat (1) for automatically limiting the position in cooperation with the locking mechanism (7).

6. A cable connection device for electric power engineering according to claim 5, characterized in that: The auxiliary limiting mechanism (8) includes a cylindrical spring (81), a guide tube (82), a movable plate (83), a pull rope (84), a connecting plate (85) and a limit block (86). A cylindrical spring (81) is provided between the L-shaped slide bar (72) and the square slide groove (71). Guide tubes (82) are symmetrically provided on both the front and rear sides of the mounting seat (1). The side of the mounting seat (1) is slidably connected to the movable plate (83). The connecting plate (85) is fixed to the movable plate (83). One end of the pull rope (84) is fixed to the L-shaped slide bar (72), and the other end passes through the guide tube (82) and is fixed to the movable plate (83). A limit block (86) is fixed to the side of the bottom of the sliding plate (41) opposite to the pull ring (43). The limit block (86) is in contact with the movable plate (83).

7. A cable connection device for electric power engineering according to claim 6, characterized in that: The contact surfaces of the limit block (86) and the movable plate (83) are designed to be inclined relative to each other.

8. A cable connection device for electric power engineering according to claim 6, characterized in that: The invention also includes a power-off mechanism (9), wherein the branch line assembly (6) is provided with a power-off mechanism (9) for synchronously powering off the connection terminal (65); the power-off mechanism (9) includes a sliding column (91), a movable ring (92) and a pulling frame (94); the bottom of the limiting ring (631) is fixedly connected to the sliding column (91); the movable ring (92) is symmetrically connected to the front cross section of the connection ring (61) in a sliding manner; the movable ring (92) is provided with an arc-shaped groove (93) adapted to the sliding column (91); and the movable ring (92) is connected to the pulling frame (94).

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