Emergency access device for insulated line of low-voltage overhead line

Abstract

The invention relates to a low-voltage overhead line insulation line emergency access device, which comprises a wire clamp, a low-voltage arc extinguish chamber device, a secondary disconnection drainage line mechanism, a terminal interface and a drainage copper bar, and is characterized in that the wire clamp is connected to the upper end of the low-voltage arc extinguish chamber device and is used for clamping an overhead line; the secondary disconnection drainage circuit mechanism and the terminal interface are both installed on the drainage copper bar, the terminal interface is vertically upward, the secondary disconnection drainage circuit mechanism is provided with a liftable mobile terminal, and the mobile terminal is in contact with or separated from a contact finger of the low-voltage arc extinguish chamber device when moving up and down. And therefore, through-flow or disconnection of a drainage line can be realized. According to the invention, the design is reasonable, the low-voltage arc extinguish chamber device is added to ensure that electric arc can be eliminated when an access line is disconnected, and meanwhile, a secondary disconnection drainage line mechanism is added to ensure that the line is completely disconnected again to eliminate potential safety hazards; and meanwhile, the terminal interface is installed vertically upwards, so that the drainage wire can be quickly hooked, and the hooking access mode of the drainage wire is more convenient, quick and labor-saving.

Description

Technical Field

[0001] The invention relates to an emergency access device for a low-voltage overhead line insulation line. Background Art

[0002] At present, when low-voltage emergency operations at home and abroad need to connect low-voltage overhead lines, low-voltage drainage cables are often used to be directly hung on the overhead lines using wire clamps. This access method has the following shortcomings: (1) There is no fixed position. Each time it is hung, the insulation layer of the conductor needs to be temporarily cut open to make an access point before the connection can be made, which is more troublesome to operate; (2) There is no arc extinguishing device, so it is impossible to use live hanging. Once hung, an arc will be generated, causing personal injury. Therefore, the original access method has safety hazards, and the only way to use the power outage operation method is to use emergency hanging of low-voltage drainage lines. Summary of the invention

[0003] The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide an emergency access device for a low-voltage overhead line insulated line, which has a reasonable design and can realize live working.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an emergency access device for a low-voltage overhead line insulated line, comprising a wire clamp, a low-voltage arc extinguishing chamber device, a secondary disconnection drainage line mechanism, a terminal interface and a drainage copper bus, wherein the wire clamp is connected to the upper end of the low-voltage arc extinguishing chamber device and is used to clamp the overhead line; the secondary disconnection drainage line mechanism and the terminal interface are both installed on the drainage copper bus, the terminal interface is vertically upward, and the secondary disconnection drainage line mechanism is provided with a movable terminal that can be raised and lowered, and the movable terminal contacts or separates from the contact finger of the low-voltage arc extinguishing chamber device when moving up and down to realize current flow or disconnect the drainage line.

[0005] Furthermore, the low-voltage arc extinguishing chamber device includes a vertically arranged cylindrical insulating shell, a vacuum arc extinguishing chamber arranged inside the insulating shell, and the interior of the vacuum arc extinguishing chamber is provided with static contacts and moving contacts spaced apart at upper and lower intervals. The lower end of the moving contact extends out of the vacuum arc extinguishing chamber and is provided with a matching hole for facilitating the moving terminal to move upward and extend therein, and the inner side wall of the matching hole is provided with an arc extinguishing chamber contact finger for contacting the moving terminal.

[0006] Furthermore, the drainage copper bar is installed at the bottom of the insulating shell; the low-voltage arc extinguishing chamber device also includes a contact driving mechanism for driving the moving contact to rise and fall, the contact driving mechanism includes an operating swing arm, a contact connecting rod and a crank, the contact connecting rod is located on the inner side of the insulating shell, the contact connecting rod vertically penetrates the drainage copper bar, the upper end of the contact connecting rod is hinged to the outer side wall of the lower end of the moving contact, and the lower end of the contact connecting rod is hinged to one end of the crank; the operating swing arm is located on the left side of the drainage copper bar, and the middle part of the operating swing arm is fixedly connected to the other end of the crank through a connecting shaft.

[0007] Furthermore, the secondary disconnection drainage line mechanism also includes a copper sleeve, an outer sleeve, a reset spring, and a first contact finger. The copper sleeve and the outer sleeve are coaxially arranged and respectively fixed on the top and bottom of the drainage copper busbar. The lower end surface of the copper sleeve contacts the top surface of the drainage copper busbar to realize flow. The movable terminal is a rod-shaped structure. The movable terminal slides vertically from bottom to top in sequence through the outer sleeve, the drainage copper busbar and the copper sleeve. The first contact finger is arranged on the inner side wall of the copper sleeve and contacts with the movable terminal to realize flow. The reset spring is vertically arranged at the lower end of the inner part of the outer sleeve, the lower end of the reset spring abuts against the bottom of the outer sleeve, and the upper end of the reset spring abuts against the annular flange on the peripheral side of the movable terminal. The reset spring is used to push the movable terminal to move upward and reset.

[0008] Furthermore, the circumferential side wall of the outer sleeve is provided with an L-shaped guide groove; the circumferential side wall of the annular flange is radially provided with a guide pin, the guide pin is slidably matched with the L-shaped guide groove, and the short side of the L-shaped guide groove is provided with a snap-in socket to facilitate the guide pin to be snapped upward.

[0009] Furthermore, a first operating pull ring for cooperating with an insulating operating rod is provided at the lower end of the movable terminal.

[0010] Furthermore, the terminal interface includes a terminal socket with a vertically arranged electrode plug-in hole and an inverted U-shaped hanging electrode. The terminal socket is vertically installed on the drainage copper bus to realize current flow, and one side of the hanging electrode is plugged into the electrode plug-in hole to realize current flow. A connecting plate is provided on the other side of the hanging electrode, and a connecting hole for connecting to the copper terminal terminal cable is provided on the connecting plate.

[0011] Furthermore, the terminal mother socket includes a mother socket copper terminal vertically fixed on the drainage copper busbar, and a mother socket shell sleeved on the outside of the mother socket copper terminal. The bottom surface of the mother socket copper terminal contacts the top surface of the drainage copper busbar to achieve current flow. The middle part of the mother socket copper terminal is provided with an electrode plug-in hole to facilitate the insertion of one side of the hanging electrode, and the inner circumference of the electrode plug-in hole is provided with a second contact finger for contacting the hanging electrode to achieve current flow.

[0012] Furthermore, the wire clamp includes a rod-shaped wire clamp body, the upper end of the wire clamp body is provided with a hook-shaped clamp for hooking the overhead line, and the outer cover of the clamp is provided with an insulating cap; a copper nut is threaded on the outer side of the wire clamp body, and an insulating sleeve is sleeved on the outer side of the copper nut, and a clamping sleeve sleeved on the outer side of the wire clamp body is provided above the copper nut. When the copper nut is rotated by the insulating sleeve, the copper nut drives the clamping sleeve to move upward along the wire clamp body and press the overhead line; the lower end of the wire clamp body is provided with a connecting socket for facilitating the insertion of the installation joint at the upper end of the low-voltage arc extinguishing chamber device, and the side wall of the connecting socket is radially threaded with a fixing screw for locking the installation plug.

[0013] Furthermore, an observation port is provided on the lower side wall of the insulating shell, and the observation port penetrates along the radial direction of the insulating shell and is used to observe whether the movable terminal is inserted into the matching hole.

[0014] Compared with the prior art, the present invention has the following effects: the present invention is reasonably designed, and a low-voltage arc extinguishing chamber device is added to ensure that the arc can be eliminated when the access line is disconnected. At the same time, a secondary disconnection drainage line mechanism is added to ensure that the line is completely disconnected again, eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 1 is a schematic diagram of a front cross-sectional structure of an embodiment of the present invention; Figure 3 yes Figure 2 Schematic diagram of the state of the middle movable terminal cooperating with the low-voltage arc extinguishing chamber device; Figure 4 1 is a schematic diagram of the main cross-sectional structure of a low-voltage arc extinguishing chamber device in an embodiment of the present invention; Figure 5 2 is a schematic diagram of the main cross-sectional structure of the secondary disconnection drainage line mechanism in an embodiment of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the secondary disconnection drainage line mechanism in an embodiment of the present invention; Figure 7 Schematic diagram of the outer sleeve structure of the secondary disconnection drainage line mechanism in an embodiment of the present invention; Figure 8 is a schematic diagram of the main cross-sectional structure of a terminal interface in an embodiment of the present invention; Fig. 9 is a schematic diagram of the structure of a contact driving mechanism in an embodiment of the present invention; Fig.10 is a schematic diagram of the main cross-sectional structure of the wire clamp in an embodiment of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the wire clamp body of the wire clamp in an embodiment of the present invention.

[0016] In the figure: 1-wire clamp; 2-low-voltage arc extinguishing chamber device; 3-secondary disconnection drainage line mechanism; 4-terminal interface; 5-drainage copper busbar; 6-overhead line; 7-movable terminal; 8-insulating shell; 9-vacuum arc extinguishing chamber; 10-static contact; 11-moving contact; 12-matching hole; 13-arc extinguishing chamber contact finger; 14-installation joint; 15-operating swing arm; 16-contact connecting rod; 17-crank; 18-connecting shaft; 19-copper sleeve; 20-outer sleeve; 21-reset spring; 22-first contact finger; 23-annular flange; 24-L shaped guide groove; 25-guide pin; 26-bayonet; 27-first operating pull ring; 28-electrode plug hole; 29-terminal female socket; 30-hanging electrode; 31-connecting plate; 32-connecting hole; 33-copper terminal terminal cable; 34-female copper terminal; 35-female socket shell; 36-second contact finger; 37-second operating pull ring; 38-clip body; 39-clamp; 40-insulating cap; 41-copper nut; 42-insulating sleeve; 43-clamping sleeve; 44-connecting socket; 45-fastening screw; 46-observation port. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] like Figures 1 to 11As shown, the present invention provides an emergency access device for an insulated line of a low-voltage overhead line, comprising a wire clamp 1, a low-voltage arc extinguishing chamber device 2, a secondary disconnection drainage line mechanism 3, a terminal interface 4 and a drainage copper bus 5, wherein the wire clamp 1 is connected to the upper end of the low-voltage arc extinguishing chamber device 2 and is used to clamp the overhead line 6. When the drainage line is connected, the emergency access device is fixedly connected to the overhead line 6 through the wire clamp 1 to realize the connection of the drainage line; the drainage copper bus is arranged at the bottom of the low-voltage arc extinguishing chamber device, the secondary disconnection drainage line mechanism 3 and the terminal interface 4 are respectively installed at the left and right ends of the drainage copper bus 5, and the terminal interface 4 is vertically installed on the drainage copper bus 5 upward to facilitate the rapid connection of the drainage line; the secondary disconnection drainage line mechanism 3 is provided with a movable terminal 7 that can be raised and lowered, and the movable terminal 7 contacts or separates with the contact finger of the low-voltage arc extinguishing chamber device 2 when moving up and down, and current is realized when the movable terminal contacts the contact finger of the low-voltage arc extinguishing chamber device; when the movable terminal separates from the contact finger of the low-voltage arc extinguishing chamber device, the drainage line is disconnected. By adding a low-voltage arc extinguishing chamber device, it is ensured that the arc can be extinguished when the access line is disconnected. At the same time, a secondary disconnection drainage line mechanism is added to ensure that the line is completely disconnected again and eliminate safety hazards.

[0020] In this embodiment, Figure 4 As shown, the low-voltage arc extinguishing chamber device 2 includes a vertically arranged cylindrical insulating shell 8 and a vacuum arc extinguishing chamber 9 arranged inside the insulating shell 8. The vacuum arc extinguishing chamber can play an arc extinguishing role when disconnecting the drainage line. Specifically, the vacuum arc extinguishing chamber 9 is provided with a static contact 10 and a moving contact 11 spaced apart at the upper and lower ends. The lower end of the moving contact 11 extends out of the vacuum arc extinguishing chamber 9 and is provided with a matching hole 12 for the movable terminal to move upward and then extend into. The inner side wall of the matching hole 12 is provided with an arc extinguishing chamber contact finger 13 for contacting the movable terminal 7. When the movable terminal extends into the matching hole and contacts with the arc extinguishing chamber contact finger, the flow is realized.

[0021] In this embodiment, the upper end of the insulating housing 8 is provided with a mounting joint 14, which protrudes upwards; the upper end of the static contact 10 is screwed to the mounting joint 14. The mounting joint 14 is used to connect with the wire clamp 1 to achieve flow through end face contact.

[0022] In this embodiment, the drainage copper bus 5 is installed at the bottom of the insulating shell 8, and the secondary disconnection drainage line mechanism is located directly below the insulating shell.

[0023] In this embodiment, Figure 4 , 9As shown, the low-voltage arc extinguishing chamber device 2 also includes a contact driving mechanism for driving the moving contact 11 to rise and fall vertically (i.e., move up and down), and the contact driving mechanism includes an operating swing arm 15, a contact connecting rod 16 and a crank 17. The contact connecting rod 16 is located on the inner side of the insulating shell 8 and the lower end thereof extends out of the insulating shell. The contact connecting rod 16 vertically penetrates the drainage copper bar 5 downward, and the upper end of the contact connecting rod 16 is hinged to the outer side wall of the lower end of the moving contact 11, and the lower end of the contact connecting rod 16 is hinged to one end of the crank 17; the operating swing arm 15 is located on the left side of the drainage copper bar 5, and the middle part of the operating swing arm 15 is fixedly connected to the other end of the crank 17 through a connecting shaft 18, and both ends of the operating swing arm 15 have holes for matching with the insulating operating rod. When in use, the operating swing arm 15 is rotated through the existing insulating operating rod, and the operating swing arm 15 drives the crank 17 to rotate synchronously. When the crank 17 rotates, it drives the contact connecting rod 16 to move up and down, and the contact connecting rod 16 pulls the moving contact 11 to move up and down.

[0024] When the low-voltage arc extinguishing chamber device is working: when the drainage line is connected, the low-voltage arc extinguishing chamber device 2 is fixedly connected to the wire clamp 1 to achieve flow through the end face contact; the low-voltage arc extinguishing chamber device 2 can play an arc extinguishing role when the drainage line is disconnected. When the drainage line needs to be disconnected, the operating swing arm 15 can be driven to rotate by the insulating operating rod first, and the operating swing arm 15 drives the contact connecting rod 16 to move downward through the crank 17, and the contact connecting rod 16 drives the moving contact 11 to move downward, so as to disconnect the moving contact 11 of the arc extinguishing chamber from the static contact 10. Since the vacuum inside the arc extinguishing chamber is closed, there will be no arc when the moving contact is disconnected, thereby playing an arc extinguishing role when the drainage line is disconnected.

[0025] In this embodiment, Figure 5-7 As shown, the secondary disconnection drainage line mechanism 3 also includes a copper sleeve 19, an outer sleeve 20, a reset spring 21, and a first contact finger 22. The copper sleeve 19 and the outer sleeve 20 are coaxially arranged, and the copper sleeve 19 and the outer sleeve 20 are respectively fixed on the top and bottom of the drainage copper bus 5. The lower end surface of the copper sleeve 19 contacts the top surface of the drainage copper bus 5 to realize flow. The movable terminal 7 is a rod-shaped structure, and the movable terminal 7 slides vertically from bottom to top in sequence through the outer sleeve 20, the drainage copper bus 5 and the copper sleeve 19. The first contact finger 22 is arranged on the inner side wall of the copper sleeve 19 and contacts the movable terminal 7 to realize flow; the reset spring 21 is vertically arranged at the lower end inside the outer sleeve 20, the lower end of the reset spring 21 abuts against the bottom of the outer sleeve 20, and the upper end of the reset spring 21 abuts against the annular flange 23 on the side surface of the movable terminal 7, and the reset spring 21 is used to push the movable terminal 7 to move upward and reset.

[0026] In this embodiment, Figure 7As shown, the peripheral side wall of the outer sleeve 20 is provided with an L-shaped guide groove 24, the long side of the guide groove 24 extends vertically, and the short side extends horizontally; the peripheral side wall of the annular flange 23 is radially provided with a guide pin 25, the guide pin 25 is slidably matched with the L-shaped guide groove 24, and the short side of the L-shaped guide groove 24 is provided with a bayonet 26 to facilitate the guide pin 25 to be snapped upward. When the movable terminal 7 moves up and down, the guide pin 25 slides along the L-shaped guide groove 24. Specifically: when the movable terminal 7 moves downward, the guide pin 25 slides downward along the long side of the L-shaped guide groove 24; when the guide pin 25 moves to the short side of the L-shaped guide groove 24, the movable terminal 7 is rotated 90 degrees clockwise to make the guide pin 25 slide along the short side of the L-shaped guide groove 24, and finally the guide pin 25 is inserted into the bayonet 26 to achieve the positioning of the movable terminal; after the movable terminal 7 is rotated 90 degrees counterclockwise, the movable terminal 7 moves upward under the elastic force of the reset spring 21, and the upper end of the movable terminal 7 extends into the matching hole and contacts with the arc extinguishing chamber contact finger to achieve current flow.

[0027] In this embodiment, in order to facilitate the movement and rotation of the movable terminal, the lower end of the movable terminal 7 is screwed with a first operating pull ring 27 for cooperating with the insulating operating rod. The current is passed through the movable terminal in contact with the arc extinguishing chamber contact finger, and the insulating operating rod can be used to operate the first operating pull ring of the movable terminal to slide the movable terminal up and down to realize the on and off of the drainage line.

[0028] In this embodiment, Figure 8 As shown, the terminal interface 4 includes a terminal socket 29 with a vertically arranged electrode plug hole 28 and an inverted U-shaped hanging electrode 30. The terminal socket 29 is vertically installed on the drainage copper bus 5 to realize current flow; one side of the hanging electrode 30 is plugged into the electrode plug hole 28 to realize current flow, and the other side of the hanging electrode 30 is provided with a connecting plate 31. The connecting plate 31 is provided with a connecting hole 32 for connecting to a copper terminal terminal cable 33. When in use, the terminal cable with a crimped copper terminal can be hung with the hanging electrode through the connecting hole to realize the drainage wiring of the overhead line.

[0029] In this embodiment, Figure 8 As shown, the terminal female socket 29 includes a female socket copper terminal 34 vertically fixed on the drainage copper bus 5, and a female socket shell 35 sleeved on the outside of the female socket copper terminal 34. The bottom surface of the female socket copper terminal 34 contacts the top surface of the drainage copper bus 5 to achieve flow. The middle part of the female socket copper terminal 35 is provided with an electrode plug-in hole 28 for facilitating the insertion of one side of the hanging electrode 30. The inner circumference of the electrode plug-in hole 28 is provided with a second contact finger 36 for contacting the hanging electrode to achieve flow.

[0030] In this embodiment, a second operating pull ring 37 for cooperating with an insulating operating rod is screwed on the lower end of the other side of the hanging electrode 30. The insulating operating rod can be used to hang the hanging electrode on the terminal socket to achieve drainage of the overhead line.

[0031] In this embodiment, Fig.10 , 11 As shown, the wire clamp 1 includes a rod-shaped wire clamp body 38, the upper end of the wire clamp body 38 is provided with a hook-shaped clamp 39 for hooking the overhead line, and the outer cover of the clamp 39 is provided with an insulating cap 40; the outer side of the wire clamp body 38 is threaded with a copper nut 41, the outer side of the copper nut 41 is sleeved with an insulating sleeve 42, and the upper part of the copper nut 41 is provided with a clamping sleeve 43 sleeved on the outer side of the wire clamp body 38, the bottom of the clamping sleeve is in contact with the top of the copper nut, and when the copper nut 41 is rotated through the insulating sleeve 42, the copper nut 41 drives the clamping sleeve 43 to move upward along the wire clamp body 38 and press the overhead line, that is, the wire clamp 1 clamps the overhead line 6 from the upper and lower sides through the clamp 39 and the clamping sleeve 43. The wire clamp clamps the overhead line by rotating the copper nut with the insulating sleeve, and the clamping structure is simple, convenient, labor-saving, and the outer side is insulated, safe and reliable.

[0032] In this embodiment, a connecting hole 44 is provided at the lower end of the wire clamp body 38 to facilitate the insertion of the mounting connector at the upper end of the low-voltage arc extinguishing chamber device 2, and a set screw 45 for locking the mounting plug is radially threaded on the side wall of the connecting hole 44.

[0033] In this embodiment, the lower side wall of the insulating housing is provided with an observation port 46, which penetrates the insulating housing in the radial direction and is used to observe whether the movable terminal 7 is inserted into the matching hole. Since the arc extinguishing device is a vacuum-sealed arc extinguishing structure, the disconnection of the arc extinguishing device cannot be clearly seen, and whether it is completely disconnected cannot be directly observed, so the observation port is provided to ensure that the disconnection of the access line is clearly visible.

[0034] The advantages of the present invention are: adding a low-voltage arc extinguishing chamber device to ensure that the arc can be eliminated when the access line is disconnected, and adding a visual secondary disconnection drainage line mechanism to ensure that the line is completely disconnected again to eliminate safety hazards. Finally, the connection terminal of the access device is a terminal female socket with a contact finger for current flow, wherein the electrode plug hole of the female socket is installed vertically upward, and the drainage line can be quickly connected to drain by using an insulating rod hanging method. The hooking access method of the drainage line is more convenient, fast and labor-saving than the traditional plug-in wiring method.

[0035] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0036] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0037] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A low voltage overhead line insulated line emergency access device, characterized in that: It includes a wire clamp, a low-voltage arc extinguishing chamber device, a secondary disconnection drainage line mechanism, a terminal interface and a drainage copper bus. The wire clamp is connected to the upper end of the low-voltage arc extinguishing chamber device and is used to clamp the overhead line; the secondary disconnection drainage line mechanism and the terminal interface are both installed on the drainage copper bus, and the terminal interface is vertically upward. The secondary disconnection drainage line mechanism is provided with a movable terminal that can be raised and lowered. When the movable terminal moves up and down, it contacts or separates from the contact finger of the low-voltage arc extinguishing chamber device to achieve current flow or disconnect the drainage line.

2. The low-voltage overhead line insulated line emergency access device according to claim 1 is characterized in that: The low-voltage arc extinguishing chamber device includes a vertically arranged cylindrical insulating shell and a vacuum arc extinguishing chamber arranged inside the insulating shell. The interior of the vacuum arc extinguishing chamber is provided with static contacts and moving contacts spaced apart from each other at upper and lower intervals. The lower end of the moving contact extends out of the vacuum arc extinguishing chamber and is provided with a matching hole for facilitating the moving terminal to move upward and extend therein. The inner side wall of the matching hole is provided with an arc extinguishing chamber contact finger for contacting the moving terminal.

3. The low-voltage overhead line insulated line emergency access device according to claim 2 is characterized in that: The drainage copper bar is installed at the bottom of the insulating shell; the low-voltage arc extinguishing chamber device also includes a contact driving mechanism for driving the moving contact to rise and fall, the contact driving mechanism includes an operating swing arm, a contact connecting rod and a crank, the contact connecting rod is located on the inner side of the insulating shell, the contact connecting rod vertically penetrates the drainage copper bar, the upper end of the contact connecting rod is hinged to the outer side wall of the lower end of the moving contact, and the lower end of the contact connecting rod is hinged to one end of the crank; the operating swing arm is located on the left side of the drainage copper bar, and the middle part of the operating swing arm is fixedly connected to the other end of the crank through a connecting shaft.

4. The low-voltage overhead line insulated line emergency access device according to claim 1, characterized in that: The secondary disconnection drainage line mechanism also includes a copper sleeve, an outer sleeve, a reset spring, and a first contact finger. The copper sleeve and the outer sleeve are coaxially arranged and respectively fixed on the top and bottom of the drainage copper busbar. The lower end surface of the copper sleeve contacts the top surface of the drainage copper busbar to realize flow. The movable terminal is a rod-shaped structure. The movable terminal slides vertically from bottom to top in sequence through the outer sleeve, the drainage copper busbar and the copper sleeve. The first contact finger is arranged on the inner side wall of the copper sleeve and contacts with the movable terminal to realize flow. The reset spring is vertically arranged at the lower end of the inner part of the outer sleeve, the lower end of the reset spring abuts against the bottom of the outer sleeve, and the upper end of the reset spring abuts against the annular flange on the peripheral side of the movable terminal. The reset spring is used to push the movable terminal to move upward and reset.

5. The low-voltage overhead line insulated line emergency access device according to claim 4 is characterized in that: The circumferential side wall of the outer sleeve is provided with an L-shaped guide groove; the circumferential side wall of the annular flange is radially provided with a guide pin, the guide pin is slidably matched with the L-shaped guide groove, and the short side of the L-shaped guide groove is provided with a snap-in socket to facilitate the guide pin to be snapped upward.

6. The low-voltage overhead line insulated line emergency access device according to claim 1 or 4, characterized in that: The lower end of the movable terminal is provided with a first operating pull ring for cooperating with the insulating operating rod.

7. The low-voltage overhead line insulated line emergency access device according to claim 1, characterized in that: The terminal interface includes a terminal socket with a vertically arranged electrode plug-in hole and an inverted U-shaped hanging electrode. The terminal socket is vertically installed on the drainage copper busbar to realize current flow. One side of the hanging electrode is plugged into the electrode plug-in hole to realize current flow. A connecting plate is arranged on the other side of the hanging electrode, and a connecting hole for connecting to a copper terminal terminal cable is arranged on the connecting plate.

8. The low-voltage overhead line insulated line emergency access device according to claim 7, characterized in that: The terminal female socket includes a female socket copper terminal vertically fixed on the drainage copper busbar, and a female socket shell sleeved on the outside of the female socket copper terminal. The bottom surface of the female socket copper terminal contacts the top surface of the drainage copper busbar to achieve current flow. The middle part of the female socket copper terminal is provided with an electrode plug-in hole for facilitating the insertion of one side of the hanging electrode. The inner circumference of the electrode plug-in hole is provided with a second contact finger for contacting the hanging electrode to achieve current flow.

9. The low-voltage overhead line insulated line emergency access device according to claim 1, characterized in that: The wire clamp includes a rod-shaped wire clamp body, the upper end of the wire clamp body is provided with a hook-shaped clamp for hooking the overhead line, and the outer cover of the clamp is provided with an insulating cap; a copper nut is threaded on the outer side of the wire clamp body, and an insulating sleeve is sleeved on the outer side of the copper nut, and a clamping sleeve sleeved on the outer side of the wire clamp body is provided above the copper nut. When the copper nut is rotated by the insulating sleeve, the copper nut drives the clamping sleeve to move upward along the wire clamp body and press the overhead line; the lower end of the wire clamp body is provided with a connecting socket for facilitating the insertion of the installation joint at the upper end of the low-voltage arc extinguishing chamber device, and the side wall of the connecting socket is threaded radially with a fixing screw for locking the installation plug.

10. The low-voltage overhead line insulated line emergency access device according to claim 2, characterized in that: The lower end side wall of the insulating shell is provided with an observation port, which penetrates the insulating shell in the radial direction and is used to observe whether the movable terminal is inserted into the matching hole.

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