Vehicle socket box for easy maintenance

Abstract

The present invention relates to the technical field of socket connection, and discloses a vehicle socket box convenient for maintenance, which includes a box body and a box door. A socket is fixedly installed on the front surface of the box door, and a mechanical interlock assembly is arranged inside the box door. The mechanical interlock assembly includes a gear, a toothed plate, a limit pin and a transmission shaft. The gear is fixedly installed on the surface of a hexagonal shaft, the toothed plate is slidably installed inside the box door, and the gear and the toothed plate are meshed and driven. The limit pin and the transmission shaft are both slidably installed in the socket, compression springs are sleeved on the surfaces of the limit pin and the transmission shaft, a limit disc is fixedly installed at the rear end of the transmission shaft, and a limit groove is formed on the lower surface of the toothed plate. For the socket box proposed by the present invention, by arranging a mechanical interlock assembly inside the box door, the ends of the limit pin and the transmission shaft in the mechanical interlock assembly both extend to the outside of the socket. By pressing the front ends of the limit pin and the transmission shaft outside the box, it can be detected whether the actions of the limit pin and the transmission shaft are normal, so as to achieve the effect of convenient maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of socket connection, in particular to a vehicle socket box which is convenient for maintenance. Background Art

[0002] In a socket box for special aviation vehicles, it is required that the circuit breaker and the connector of each output circuit of the socket box have a mechanical interlocking function to prevent misoperation. In the prior art, a patent document with the announcement number CN108879260A discloses a mechanical interlocking device suitable for plugs and sockets with different currents, including a mounting panel, a socket, an interlocking mechanism, and an actuator. The socket is arranged on the mounting panel. The interlocking mechanism includes a fixed plate, a sliding card rod, and a movable baffle. The fixed plate is provided with a sliding card rod and the sliding card rod can slide left and right on the fixed plate. A limit key is provided at one end of the sliding card rod. The sliding card rod and the actuator are connected to each other. The actuator is linked to the circuit breaker, one end of the movable baffle is arranged on the installation panel, and the other end is arranged at the key slot of the socket, the limit key is arranged on one side of the movable baffle, and a card is also provided on the sliding card rod, and the card is a protruding structure close to the limit key and when the sliding card rod slides to the left, the card can jam the front end of the plug. This scheme realizes the mechanical interlocking function in a way that the card is stuck in the key hole so that the plug cannot be pulled out. The card is easy to deform, and the key hole is easy to be damaged or blocked, resulting in the failure of the interlocking function. In other words, the key hole gap is enlarged due to frequent wear, resulting in the loosening of the plug and the socket, causing failures, and there are many safety hazards.

[0003] Based on the above reasons, the existing mechanical interlocking mechanism of the plug and socket has the operating parts of the mechanical interlocking mechanism placed inside. During the maintenance process, it is inconvenient to check whether the operating parts are normal outside the socket box, which has many safety hazards and needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that the mechanical interlocking mechanism of the plug and socket is inconvenient to repair and has poor safety, and to propose a vehicle socket box that is easy to repair.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a vehicle socket box that is easy to maintain, including a box body and a box door, a socket is fixedly installed on the front of the box door, a mounting frame is fixedly installed on the inner side of the box door, a circuit breaker is fixedly installed in the mounting frame, a rotating handle is rotatably installed on the front of the box door, a hexagonal shaft is fixedly installed inside the rotating handle, the hexagonal shaft extends into the circuit breaker, and the circuit breaker is controlled to be on or off by rotating the rotating handle.

[0006] A mechanical interlock assembly is provided on the inner side of the cabinet door. The mechanical interlock assembly includes a gear, a toothed plate, a limit pin and a transmission shaft. The gear is fixedly installed on the surface of a hexagonal shaft. The toothed plate is slidably installed on the inner side of the cabinet door. The gear and the toothed plate are in meshing transmission. The limit pin and the transmission shaft are both slidably installed in a socket. Compression springs are sleeved on the surfaces of the limit pin and the transmission shaft. A limit disk is fixedly installed at the rear end of the transmission shaft. A limit groove is formed on the lower surface of the toothed plate. Under the action of the compression spring, the front ends of the limit pin and the transmission shaft extend to the outside of the socket, and the limit disk is inserted into the limit groove. By pressing the front ends of the limit pin and the transmission shaft outside the cabinet, the actions of the limit pin and the transmission shaft can be detected whether they are normal, so as to achieve the effect of convenient maintenance.

[0007] Preferably, a plug is inserted into the socket. A nut sleeve is rotatably installed at the end of the plug. The nut sleeve is threadedly connected to the external thread portion on the surface of the socket. A clamping groove is formed at the end of the nut sleeve. The front end of the limit pin extends into the clamping groove. A relief hole is formed on the surface of the toothed plate. When the limit pin expands and contracts, the rear end of the limit pin can be inserted into the relief hole. When the circuit breaker is closed, the plug cannot be pulled out, avoiding plugging and unplugging the plug while energized, and making the use safer.

[0008] Preferably, a secondary insurance assembly is provided inside the socket. The secondary insurance assembly includes a connecting plate, a connecting rod and an air sleeve. An opening groove is formed on the surface of the transmission shaft. The air sleeve is movably arranged in the opening groove of the transmission shaft. A piston is slidably installed inside the air sleeve. One end of the connecting rod is fixedly connected to the piston, and the other end of the connecting rod is fixedly connected to the inner wall of the opening groove of the transmission shaft. One end of the connecting plate is fixedly connected to the limit pin, and the other end of the connecting plate is fixedly connected to the surface of the air sleeve.

[0009] An exhaust passage is provided inside the limit pin and the connecting plate. The intake end of the exhaust passage communicates with the inner cavity of the air sleeve. The outlet of the exhaust passage is arranged on the surface of the limit pin. A rubber ring is provided inside the socket. The limit pin is slidably inserted into the rubber ring, so that the rubber ring wraps around the outlet of the exhaust passage. By providing a secondary insurance assembly between the limit pin and the transmission shaft, the mechanical interlock assembly has a delay, avoiding closing the circuit breaker immediately after inserting the plug, reducing the probability of misoperation, and further improving the safety of use.

[0010] Preferably, a mounting block is fixedly installed on the inner side of the cabinet door. Four positioning shafts are fixedly installed on the surface of the mounting block. Guide wheels are rotatably installed on the surfaces of the positioning shafts. A kidney-shaped groove is formed on the surface of the toothed plate. Each guide wheel rolls along the kidney-shaped groove. A tension spring is fixedly installed at the end of one of the positioning shafts. The end of the tension spring away from the positioning shaft is fixedly connected to the toothed plate.

[0011] A baffle is fixedly installed on the lower surface of the mounting block, and the limit pin and the transmission shaft both slide through the baffle. The compression spring includes a first compression spring and a second compression spring. The two ends of the first compression spring respectively press against the limit pin and the baffle, and the two ends of the second compression spring respectively press against the transmission shaft and the baffle, to ensure that the limit pin and the transmission shaft can freely extend and retract, as well as reset.

[0012] Preferably, when no plug is inserted into the socket, the second compression spring presses against the transmission shaft, so that the limit plate is inserted into the limit groove, the rotary handle cannot be rotated due to the constraint of the mechanical interlocking assembly, and the circuit breaker is in a power-off state and cannot be closed;

[0013] When a plug is inserted into the socket, the plug pushes the transmission shaft to move, so that the limit plate is separated from the limit groove. At the same time, the rear end of the limit pin is inserted into the clearance hole, and the rotating handle is constrained by the mechanical interlocking component and cannot rotate;

[0014] After the plug is inserted into the socket, during the process of threaded connection between the nut sleeve and the external threaded part of the socket surface, the limit pin retracts and extends to exhaust the exhaust channel, and the front end of the limit pin moves into the slot, and the rotary handle can be rotated to drive the circuit breaker to close and power on; when the circuit breaker is in the open state, the non-yielding hole area of ​​the tooth plate blocks the rear end of the limit pin, and the limit pin cannot retract and extend. The front end of the limit pin limits the rotation of the nut sleeve, so that the plug cannot be pulled out. According to this design, during the maintenance of the mechanical interlocking component, if the plug is not inserted in the socket, only the limit pin is pressed, or only the transmission shaft is pressed, or the limit pin and the transmission shaft are pressed at the same time, the circuit breaker cannot be closed immediately, thereby avoiding the occurrence of accidental closing during maintenance and improving the safety of maintenance work.

[0015] The present invention has the following beneficial effects:

[0016] 1. The socket box proposed in the present invention has a mechanical interlocking assembly on the inner side of the box door. The end portions of the limit pin and the transmission shaft in the mechanical interlocking assembly extend to the outside of the socket. When the plug is not inserted, the limit pin and the transmission shaft can be easily seen. By pressing the limit pin and the front end of the transmission shaft outside the box, it can be detected whether the limit pin and the transmission shaft are moving normally, thereby achieving the effect of convenient maintenance.

[0017] 2. The socket box proposed in the present invention sets a mechanical interlocking assembly between the socket and the rotating handle for operating the circuit breaker. When the plug is not inserted into the socket, the limit plate constrains the movement of the tooth plate so that the rotating handle cannot be rotated, ensuring that the circuit breaker cannot be closed. When the plug is inserted into the socket and the nut sleeve is threadedly connected to the socket, the circuit breaker can be closed. Since the circuit breaker is in a closed state, the limit pin constrains the rotation of the nut sleeve so that the plug cannot be removed, thereby realizing a mechanical interlocking function between the circuit breaker and the connector to avoid live plugging and unplugging of the plug. This design of preventing live plugging and unplugging of the plug prevents misoperation, provides convenience for line maintenance, and is safer to use.

[0018] 3. The mechanical interlock assembly proposed by the present invention is provided with a secondary insurance assembly between the limit pin and the transmission shaft. When the plug is inserted into the socket, during the process of the plug pushing the transmission shaft to move inward, under the action of the secondary insurance assembly, the rear end of the limit pin will be inserted into the relief hole. Although the limit disk is separated from the limit groove, the toothed plate still cannot move, ensuring that the rotary handle cannot rotate. Only when the rear end of the limit pin is separated from the relief hole can the rotary handle be rotated. This design makes the mechanical interlock assembly have a delay, avoiding closing the circuit breaker immediately after inserting the plug, reducing the probability of misoperation, and further improving the safety of use.

[0019] 4. The mechanical interlock assembly proposed by the present invention is provided with a secondary insurance assembly between the limit pin and the transmission shaft, making the mechanical interlock assembly have a delay. During the maintenance process, only by pressing the transmission shaft can the limit disk be separated from the limit groove. However, since the rear end of the limit pin will also be inserted into the relief hole, the toothed plate still cannot move, and the circuit breaker cannot be closed, avoiding the occurrence of accidental closing during maintenance and improving the safety of the maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic perspective structure of the socket box proposed by the present invention Figure 1 ;

[0021] Figure 2 Schematic perspective structure of the socket box proposed by the present invention Figure 2 ;

[0022] Figure 3 is Figure 1 The enlarged schematic view of the structure at A in

[0023] Figure 4 Schematic perspective structure of the toothed plate proposed by the present invention Figure 1 ;

[0024] Figure 5 Schematic perspective structure of the toothed plate proposed by the present invention Figure 2 ;

[0025] Figure 6 Partial schematic view of the side sectional structure of the box door proposed by the present invention Figure 1 ;

[0026] Figure 7 Partial schematic view of the side sectional structure of the box door proposed by the present invention Figure 2 ;

[0027] Figure 8 Partial schematic view of the side sectional structure of the box door proposed by the present invention Figure 3 ;

[0028] Figure 9 Electrical schematic diagram of the socket box proposed by the present invention.

[0029] In the figure: 1 box body, 2 box door, 3 socket, 4 circuit breaker, 5 rotary handle, 6 hexagonal shaft, 7 gear, 8 toothed plate, 9 limit pin, 10 transmission shaft, 11 limit groove, 12 limit disc, 13 plug, 14 nut sleeve, 15 card slot, 16 relief hole, 17 connecting plate, 18 connecting rod, 19 air sleeve, 20 piston, 21 exhaust passage, 22 rubber ring, 23 mounting block, 24 guide wheel, 25 tension spring, 26 baffle, 27 first compression spring, 28 second compression spring. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present invention.

[0032] Referring to Figures 1 - 9 , a vehicle socket box convenient for maintenance includes a box body 1 and a box door 2. A socket 3 is fixedly installed on the front surface of the box door 2. An installation frame is fixedly installed inside the box door 2. A circuit breaker 4 is fixedly installed inside the installation frame. A rotary handle 5 is rotatably installed on the front surface of the box door 2. A hexagonal shaft 6 is fixedly installed inside the rotary handle 5. The hexagonal shaft 6 extends into the circuit breaker 4, and the on or off of the circuit breaker 4 is controlled by rotating the rotary handle 5.

[0033] Among them, as Figure 3 , Figure 4 shown, a mechanical interlock assembly is provided inside the box door 2. The mechanical interlock assembly includes a gear 7, a toothed plate 8, a limit pin 9 and a transmission shaft 10. The gear 7 is fixedly installed on the surface of the hexagonal shaft 6. The toothed plate 8 is slidably installed inside the box door 2. The gear 7 and the toothed plate 8 are in meshing transmission. The limit pin 9 and the transmission shaft 10 are both slidably installed inside the socket 3. Compression springs are sleeved on the surfaces of the limit pin 9 and the transmission shaft 10. A limit disc 12 is fixedly installed at the rear end of the transmission shaft 10. A limit groove 11 is formed on the lower surface of the toothed plate 8. Under the action of the compression spring, the front ends of the limit pin 9 and the transmission shaft 10 extend to the outside of the socket 3, and the limit disc 12 is inserted into the limit groove 11.

[0034] Specifically, an installation block 23 is fixedly installed on the inner side of the box door 2. Four positioning shafts are fixedly installed on the surface of the installation block 23. Guide wheels 24 are rotatably installed on the surfaces of the positioning shafts. Waist-shaped grooves are formed on the surface of the toothed plate 8. The guide wheels 24 roll along the waist-shaped grooves. One end of a positioning shaft is fixedly installed with a tension spring 25. The end of the tension spring 25 away from the positioning shaft is fixedly connected to the toothed plate 8.

[0035] See Figure 6 , a baffle 26 is fixedly installed on the lower surface of the installation block 23. The limit pin 9 and the transmission shaft 10 both slide through the baffle 26. The compression spring includes a first compression spring 27 and a second compression spring 28. The two ends of the first compression spring 27 respectively abut against the limit pin 9 and the baffle 26. The two ends of the second compression spring 28 respectively abut against the transmission shaft 10 and the baffle.

[0036] A relief hole 16 is formed on the surface of the toothed plate 8. When the limit pin 9 expands and contracts, the rear end of the limit pin 9 can be inserted into the relief hole 16.

[0037] As Figure 6 、 Figure 7 shown, a plug 13 is inserted into the socket 3. A nut sleeve 14 is rotatably installed at the end of the plug 13. The nut sleeve 14 is threadedly connected to the external thread part on the surface of the socket 3. A clamping groove 15 is formed at the end of the nut sleeve 14. As Figure 3 shown, the front end of the limit pin 9 extends into the clamping groove 15. Among them, the electrical schematic diagrams of the socket 3, the circuit breaker 4 and the plug 13 are as Figure 9 shown.

[0038] In this embodiment, referring to Figure 8 , a secondary insurance component is arranged inside the socket 3. The secondary insurance component includes a connecting plate 17, a connecting rod 18 and an air sleeve 19. An opening groove is formed on the surface of the transmission shaft 10. The air sleeve 19 is movably arranged in the opening groove of the transmission shaft 10. A piston 20 is slidably installed inside the air sleeve 19. One end of the connecting rod 18 is fixedly connected to the piston 20. The other end of the connecting rod 18 is fixedly connected to the inner wall of the opening groove of the transmission shaft 10. One end of the connecting plate 17 is fixedly connected to the limit pin 9. The other end of the connecting plate 17 is fixedly connected to the surface of the air sleeve 19.

[0039] An exhaust passage 21 is arranged inside the limit pin 9 and the connecting plate 17. The intake end of the exhaust passage 21 is communicated with the inner cavity of the air sleeve 19. The outlet of the exhaust passage 21 is arranged on the surface of the limit pin 9. A rubber ring 22 is arranged inside the socket 3. The limit pin 9 is slidably inserted into the rubber ring 22, so that the rubber ring 22 wraps around the outlet of the exhaust passage 21.

[0040] During the use process, as Figure 6 shown, when the plug 13 is not inserted into the socket 3, the second compression spring 28 abuts against the transmission shaft 10, so that the limit disc 12 is inserted into the limit groove 11. Referring toFigure 4 At this time, the toothed plate 8 cannot move left or right, the rotary handle 5 is restricted by the mechanical interlock assembly and cannot rotate, and the circuit breaker 4 is in a de-energized state and cannot be closed.

[0041] As Figure 7 shown, when the plug 13 is inserted into the socket 3, the plug 13 pushes the transmission shaft 10 to move to the right, separating the limit disk 12 from the limit groove 11.

[0042] Due to the presence of the secondary fuse assembly, see Figure 8 , when the transmission shaft 10 moves to the right, it drives the piston 20 to move and compress the air in the air sleeve 19. The air pressure in the air sleeve 19 increases, causing the air sleeve 19, the connecting plate 17, and the limit pin 9 to all move to the right. At the same time, the rear end of the limit pin 9 is inserted into the relief hole 16. Although the limit disk 12 is separated from the limit groove 11 at this time, the limit pin 9 blocks the movement of the toothed plate 8, making the toothed plate 8 unable to move left or right, and the rotary handle 5 is restricted by the mechanical interlock assembly and cannot rotate, and the circuit breaker 4 is in a de-energized state.

[0043] After the plug 13 is inserted into the socket 3, during the process of the nut sleeve 14 being threadedly connected to the external thread portion on the surface of the socket 3, when the nut sleeve 14 is screwed in, it presses against the left end of the limit pin 9. Refer to Figure 8 , the limit pin 9 moves to the right. When the air outlet of the exhaust passage 21 is separated from the rubber ring 22, the air in the air sleeve 19 is discharged through the exhaust passage 21, and the air pressure in the air sleeve 19 decreases. Under the action of the first compression spring 27, the limit pin 9 moves to the left until the front end of the limit pin 9 moves into the card slot 15, as Figure 3 shown.

[0044] Since the limit disk 12 is separated from the limit groove 11 and the end of the limit pin 9 is pulled out of the relief hole 16, at this time, as Figure 5 shown, the toothed plate 8 can move left and right, the rotary handle 5 can rotate, and the circuit breaker 4 is driven to close and energize.

[0045] When the circuit breaker 4 is in the open state, the non-relief hole 16 area of the toothed plate 8 blocks the rear end of the limit pin 9. See Figure 7 , the left end of the limit pin 9 is staggered from the relief hole 16, and the limit pin 9 cannot move left and right telescopically. The front end of the limit pin 9 restricts the rotation of the nut sleeve 14, making the plug 13 unable to be pulled out. That is to say, when the circuit breaker 4 is closed and the circuit is energized, the plug 13 cannot be pulled out.

[0046] When it is necessary to pull out the plug 13, it is necessary to rotate the rotary handle 5 in the reverse direction to first cut off the power of the circuit breaker 4. At this time, as Figure 4 shown, the limit disk 12 slides into the limit groove 11, the rear end of the limit pin 9 is aligned with the relief hole 16, the limit pin 9 can move telescopically, and the nut sleeve 14 is unscrewed, and then the plug 13 can be pulled out.

[0047] The socket box proposed in the present invention provides a mechanical interlocking component between the socket 3 and the rotating handle 5 for operating the circuit breaker 4. When the plug 13 is not inserted into the socket 3, the limit plate 12 constrains the tooth plate 8 to move, so that the rotating handle 5 cannot rotate, ensuring that the circuit breaker 4 cannot be closed. When the plug 13 is inserted into the socket 3 and the nut sleeve 14 is threadedly connected to the socket 3, the closing operation of the circuit breaker 4 can be performed at this time. Since the circuit breaker 4 is in a closed state, the limit pin 9 constrains the rotation of the nut sleeve 14, so that the plug 13 cannot be removed, thereby realizing a mechanical interlocking function between the circuit breaker 4 and the connector to avoid plugging and unplugging the plug 13 while it is powered on. This design of preventing plugging and unplugging the plug 13 while it is powered on prevents misoperation, provides convenience for line maintenance, and is safer to use.

[0048] By arranging a secondary insurance component between the limit pin 9 and the transmission shaft 10, when the plug 13 is inserted into the socket 3, the plug 13 pushes the transmission shaft 10 to move inward. Under the action of the secondary insurance component, the rear end of the limit pin 9 will be inserted into the clearance hole 16. Although the limit plate 12 is separated from the limit groove 11, the tooth plate 8 still cannot move, ensuring that the rotating handle 5 cannot rotate. The nut sleeve 14 must be installed in place, the air sleeve 19 must be deflated, and the front end of the limit pin 9 must be moved into the card slot 15. Figure 3 As shown, at this time, the rear end of the limit pin 9 is separated from the clearance hole 16, and the rotary handle 5 can be rotated. This design makes the mechanical interlocking component have a delay, avoiding the circuit breaker 4 being closed immediately after the plug 13 is inserted, reducing the probability of misoperation and further improving the safety of use.

[0049] The socket box proposed in the present invention has a mechanical interlocking assembly arranged on the inner side of the box door 2, and the ends of the limit pin 9 and the transmission shaft 10 in the mechanical interlocking assembly extend to the outside of the socket 3. When the plug 13 is not inserted, the ends of the limit pin 9 and the transmission shaft 10 can be easily seen at the socket 3. By pressing the front ends of the limit pin 9 and the transmission shaft 10 outside the box, it can be detected whether the limit pin 9 and the transmission shaft 10 are operating normally, thereby achieving the effect of convenient maintenance.

[0050] By arranging a secondary safety component between the limit pin 9 and the transmission shaft 10, the mechanical interlocking component has a delay. During the maintenance process, only the transmission shaft 10 is pressed to separate the limit plate 12 from the limit groove 11. However, due to the action of the secondary safety component, the rear end of the limit pin 9 is also inserted into the clearance hole 16, the tooth plate 8 still cannot move, and the circuit breaker 4 cannot be closed. Therefore, during the maintenance process, only the limit pin 9 is pressed, or only the transmission shaft 10 is pressed, or the limit pin 9 and the transmission shaft 10 are pressed at the same time, the circuit breaker 4 cannot be closed immediately, thereby avoiding the occurrence of accidental closing during maintenance and improving the safety of maintenance work.

[0051] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A vehicle socket box that is easy to maintain, comprising a box body (1) and a box door (2), characterized in that: A socket (3) is fixedly mounted on the front of the box door (2), a mounting frame is fixedly mounted on the inner side of the box door (2), a circuit breaker (4) is fixedly mounted inside the mounting frame, a rotary handle (5) is rotatably mounted on the front of the box door (2), a hexagonal shaft (6) is fixedly mounted inside the rotary handle (5), the hexagonal shaft (6) extends into the circuit breaker (4), and the circuit breaker (4) is controlled to be on or off by rotating the rotary handle (5); A mechanical interlocking assembly is arranged on the inner side of the box door (2), and the mechanical interlocking assembly comprises a gear (7), a tooth plate (8), a limit pin (9) and a transmission shaft (10); the gear (7) is fixedly mounted on the surface of the hexagonal shaft (6); the tooth plate (8) is slidably mounted on the inner side of the box door (2); the gear (7) and the tooth plate (8) are meshed for transmission; the limit pin (9) and the transmission shaft (10) are both slidably mounted in the socket (3); the surfaces of the limit pin (9) and the transmission shaft (10) are both sleeved with compression springs; a limit plate (12) is fixedly mounted on the rear end of the transmission shaft (10); a limit groove (11) is provided on the lower surface of the tooth plate (8); under the action of the compression spring, the front ends of the limit pin (9) and the transmission shaft (10) extend to the outside of the socket (3), and the limit plate (12) is inserted into the limit groove (11); A secondary insurance component is arranged inside the socket (3), and the secondary insurance component comprises a connecting plate (17), a connecting rod (18) and an air sleeve (19); an open groove is provided on the surface of the transmission shaft (10); the air sleeve (19) is movably arranged in the open groove of the transmission shaft (10); a piston (20) is slidably mounted inside the air sleeve (19); one end of the connecting rod (18) is fixedly connected to the piston (20); the other end of the connecting rod (18) is fixedly connected to the inner wall of the open groove of the transmission shaft (10); one end of the connecting plate (17) is fixedly connected to the limit pin (9); and the other end of the connecting plate (17) is fixedly connected to the surface of the air sleeve (19).

2. The vehicle socket box that is easy to maintain according to claim 1 is characterized in that: A plug (13) is inserted into the socket (3), a nut sleeve (14) is rotatably mounted on the end of the plug (13), the nut sleeve (14) is threadedly connected to an external threaded portion on the surface of the socket (3), a slot (15) is formed at the end of the nut sleeve (14), and a front end of the limit pin (9) extends into the slot (15).

3. The vehicle socket box that is easy to maintain according to claim 2 is characterized in that: A clearance hole (16) is provided on the surface of the tooth plate (8), and when the limit pin (9) is extended and retracted, the rear end of the limit pin (9) can be inserted into the clearance hole (16).

4. The vehicle socket box for easy maintenance according to claim 3, characterized in that: An exhaust channel (21) is provided inside the limit pin (9) and the connecting plate (17); an air inlet end of the exhaust channel (21) is communicated with the inner cavity of the air sleeve (19); an air outlet of the exhaust channel (21) is provided on the surface of the limit pin (9); a rubber ring (22) is provided inside the socket (3); the limit pin (9) is slidably inserted into the rubber ring (22) so that the rubber ring (22) is wrapped around the air outlet of the exhaust channel (21).

5. The vehicle socket box for easy maintenance according to claim 4, characterized in that: A mounting block (23) is fixedly mounted on the inner side of the box door (2), and four positioning shafts are fixedly mounted on the surface of the mounting block (23). A guide wheel (24) is rotatably mounted on the surface of each positioning shaft. A waist-shaped groove is provided on the surface of the toothed plate (8), and each guide wheel (24) rolls along the waist-shaped groove. A tension spring (25) is fixedly mounted on the end of one of the positioning shafts, and the end of the tension spring (25) away from the positioning shaft is fixedly connected to the toothed plate (8).

6. The vehicle socket box for easy maintenance according to claim 5, characterized in that: A baffle (26) is fixedly mounted on the lower surface of the mounting block (23), the limit pin (9) and the transmission shaft (10) both slide through the baffle, the compression spring comprises a first compression spring (27) and a second compression spring (28), the two ends of the first compression spring (27) respectively press against the limit pin (9) and the baffle (26), and the two ends of the second compression spring (28) respectively press against the transmission shaft (10) and the baffle (26).

7. The vehicle socket box for easy maintenance according to claim 6, characterized in that: When the plug (13) is not inserted into the socket (3), the second compression spring (28) presses against the transmission shaft (10), so that the limit plate (12) is inserted into the limit groove (11), the rotary handle (5) is constrained by the mechanical interlocking component and cannot be rotated, and the circuit breaker (4) is in a power-off state and cannot be closed.

8. The vehicle socket box for easy maintenance according to claim 6, characterized in that: When the plug (13) is inserted into the socket (3), the plug (13) pushes the transmission shaft (10) to move, so that the limit plate (12) is separated from the limit groove (11). At the same time, the rear end of the limit pin (9) is inserted into the clearance hole (16), and the rotating handle (5) is constrained by the mechanical interlocking component and cannot rotate.

9. The vehicle socket box for easy maintenance according to claim 8, characterized in that: After the plug (13) is inserted into the socket (3), during the process of the nut sleeve (14) being threadedly connected to the external threaded portion of the surface of the socket (3), the limit pin (9) moves in a telescopic manner, so that the exhaust passage (21) is exhausted, and the front end of the limit pin (9) moves into the slot (15), and the rotary handle (5) can be rotated to drive the circuit breaker (4) to close and energize; When the circuit breaker (4) is in an open state, the non-displacement hole (16) area of ​​the tooth plate (8) blocks the rear end of the limit pin (9), so that the limit pin (9) cannot be extended or retracted, and the front end of the limit pin (9) restricts the rotation of the nut sleeve (14), so that the plug (13) cannot be pulled out.

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