CN112267765B

CN112267765B - Locking device for power distribution cabinet

Info

Publication number: CN112267765B
Application number: CN202011284250.4A
Authority: CN
Inventors: 宗英友; 刘伟
Original assignee: Nanjing Runyun Electric Co ltd
Current assignee: Nanjing Runyun Electric Co ltd
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-05-31
Anticipated expiration: 2040-11-17
Also published as: CN112267765A

Abstract

The invention discloses a locking device for a power distribution cabinet, which comprises a locking device, a locking device and a locking device, wherein the locking device is arranged on a cabinet door and is provided with a jack; the locking piece is arranged in the cabinet body and is connected with the jack in an embedded manner; an operation assembly capable of enabling the locking piece to be separated from the jack is further arranged between the locking device and the locking piece. The invention increases the unlocking difficulty, improves the safety and realizes the anti-theft purpose through the cooperative cooperation of various structures.

Description

Locking device for power distribution cabinet

Technical Field

The invention relates to the technical field of power distribution cabinets, in particular to a locking device for a power distribution cabinet.

Background

A power distribution cabinet is a closed or semi-closed metal cabinet assembled with switch equipment, measuring instruments, protective electrical appliances and auxiliary equipment according to the electrical wiring requirements, and is mainly used for distributing, controlling and metering electric energy and connecting cables.

The power distribution cabinet is a power distribution device formed by assembling switch equipment, measuring instruments, protective electrical appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on a screen according to the electrical wiring requirement. When in normal operation, the circuit can be switched on or off by a manual or automatic switch; when the fault or abnormal operation occurs, the circuit is cut off or an alarm is given by the aid of the protective electric appliance. The measuring instrument can display various parameters in operation, and can also adjust some electrical parameters to prompt or send out signals for deviation from normal working state.

The existing power distribution cabinet is mostly provided with a simple lock catch structure for controlling the opening or closing of the cabinet body, and a key of the universal joint is used for switching. The current switch board part is installed outdoors, and the switch board lock adopts simple hasp structure, is opened easily, becomes some lawless persons and steals the object of destruction easily, if can not take precautions against effectively, in case take place to steal still influence normal power supply order when directly causing loss of property after destroying, gives people production and life and brings a great deal of inconvenience.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The invention is provided in view of the problem that the door lock of the power distribution cabinet is easy to open in the prior art.

In order to solve the technical problems, the invention provides the following technical scheme: a locking device for a power distribution cabinet comprises a locking device,

the locking device is arranged on the cabinet door and is provided with an insertion hole; and the number of the first and second groups,

the locking piece is arranged in the cabinet body and is connected with the jack in an embedded manner;

an operation assembly capable of enabling the locking piece to be separated from the jack is further arranged between the locking device and the locking piece.

Preferably, the locking piece comprises a base and a locking piece, the locking piece is connected with the base in a sliding mode through a sliding column, and the operating assembly can drive the locking piece to slide.

Preferably, a sliding cavity is formed in the base, the sliding column is matched with the sliding cavity, and an elastic part used for resetting the sliding column is arranged in the sliding cavity.

Preferably, the locker comprises a lock body and a mounting seat, and the lock body is arranged on the cabinet door through the mounting seat;

the operating assembly comprises a push block positioned on the lock body and an auxiliary block positioned on the locking piece, an inclined plane is arranged on the auxiliary block, and a coupling surface matched with the inclined plane is arranged on the push block;

and after the coupling surface is contacted with the inclined surface, the locking block is pushed to slide so as to be separated from the jack.

Preferably, an extension cavity is arranged in the mounting seat, the lock body is located in the extension cavity, the end part of the lock body extends out of the outer side of the extension cavity, and the jack is located at the end part of the lock body;

the push block is frustum-shaped and is sleeved on the outer side of the lock body.

Preferably, the lock body includes a sliding portion and an operating portion, a sliding hole matched with the sliding portion is formed in the bottom of the extending cavity, the operating portion is located in the extending cavity, the length of the extending cavity is larger than that of the operating portion, and a gap is reserved between the inner wall of the extending cavity and the operating portion.

Preferably, the bottom of the extension cavity is further provided with a through hole, and the axial projection of the push block covers the through hole.

Preferably, the operating part is further provided with a stop block, and a spring is connected between the stop block and the bottom of the extension cavity.

Preferably, the sliding part is further provided with a guide groove, and a guide block matched with the guide groove is arranged in the sliding hole.

Preferably, the operating portion is substantially conical, and the outer wall of the operating portion is provided with a key groove extending along the axis.

The invention has the beneficial effects that: because the operating part of the invention is hidden in the extending cavity N, the operating part can not be directly pushed by a common tool, and further, the end part of the operating part is conical, so that the difficulty of pushing the operating part by the common tool is increased; even if the operation part can be pushed to move, the push block cannot be pushed to move, the locking block cannot slide towards the direction of compressing the elastic piece, and the aim of unlocking cannot be fulfilled.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the installation of the present invention;

FIG. 2 is a schematic plan view of the locking device and the locking member in a locked state according to the present invention;

FIG. 3 is a schematic view of the joint between the locking device and the locking member in the locked state according to the present invention;

FIG. 4 is a schematic view of the joint between the locking device and the locking member when the locking device is unlocked according to the present invention;

FIG. 5 is a schematic view of the overall structure of the locking member of the present invention;

FIG. 6 is a schematic view of the present invention showing the push block and the lock body separated from each other;

FIG. 7 is an exploded view of the lock body, mounting base and push block of the present invention;

FIG. 8 is a schematic longitudinal cross-sectional view of a latching mechanism of the present invention;

FIG. 9 is a schematic structural diagram of a special unlocking tool of the present invention;

fig. 10 is a longitudinal sectional view schematically showing the unlocking tool for exclusive use of the present invention.

Labeled as: 100. a locking device; 110. a lock body; 111. a sliding part; 111-1, a guide groove; 112. an operation section; 112-1, a keyway; 113. a stop block; 114. a spring; 115. a guide block; 120. a mounting seat; s1, a jack; n1, a sliding cavity; n2, an extension lumen; n3, a slide hole; n4, vias;

200. a locking member; 210. a base; 220. a locking block; 230. a traveler; 240. an elastic member;

300. an operating component; 310. a push block; 320. an auxiliary block; p1, inclined plane; p2, coupling surface;

400. a power distribution cabinet; 410. a cabinet door; 420. a cabinet body;

500. a special unlocking tool; 501. unlocking the cylinder; 502. an extension rod; 503. a handle; 504. a concave cavity; 505. and a guide block.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and it will be appreciated by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention and that the present invention is not limited by the specific embodiments disclosed below.

Example 1

Referring to fig. 1 to 5, for a first embodiment of the present invention, this embodiment provides a locking device for a power distribution cabinet, including a locking device 100 and a locking member 200, where locking and unlocking of the locking device of the present invention are realized through cooperation between the locking device 100 and the locking member 200;

it should be noted that the locker 100 is disposed on the cabinet door 410 of the power distribution cabinet 400, and the locker 100 is provided with an insertion hole S1; the locking piece 200 is arranged in the cabinet body 420 of the power distribution cabinet 400, and the locking piece 200 is connected with the jack S1 in an embedded manner; when the cabinet door 410 approaches the cabinet body 420, the locking piece 200 is inserted into the insertion hole S1 to realize locking, and the cabinet door 410 cannot be opened; when the locking member 200 is disengaged from the insertion hole S1, the cabinet door 410 moves in a direction away from the cabinet body 420, and the cabinet door 410 can be opened.

An operation assembly 300 capable of separating the locking piece 200 from the insertion hole S1 is further arranged between the locking device 100 and the locking piece 200, and the locking piece 200 is separated from the insertion hole S1 through operation of the operation assembly 300, so that the unlocking purpose is achieved; the locking device of the present invention requires movement of the operating assembly 300 to effect unlocking.

It should be noted that the locking member 200 includes a base 210 and a locking block 220, the base 210 is fixed to the cabinet 420 through a mounting plate, the locking block 220 is connected to the base 210 through a sliding column 230 in a sliding manner, the locking block 220 can move through the sliding column 230, specifically, the locking block 220 is driven to slide through the operation assembly 300, and the locking member 200 is separated from the insertion hole S1 through the operation of the operation assembly 300, so as to achieve the purpose of unlocking.

Specifically, a sliding cavity N1 is arranged in the base 210, the sliding column 230 is matched with the sliding cavity N1, the sliding column 230 is cylindrical, the sliding cavity N1 is a circular cavity matched with the sliding cavity N1, the sliding column 230 slides linearly in the sliding cavity N1, and an elastic part 240 for resetting the sliding column 230 is arranged in the sliding cavity N1; referring to fig. 5, the bottom of the sliding cavity N1 is closed, the top of the sliding cavity N1 is open, one end of the sliding column 230 is located in the sliding cavity N1, and the other end of the sliding column 230 extends out of the sliding cavity N1 to be connected with the locking block 220, wherein the locking block 220 cannot enter the sliding cavity N1; the elastic piece 240 is arranged between the sliding column 230 and the bottom in the sliding cavity N1, one end of the elastic piece 240 is fixedly connected with the sliding column 230, the other end of the elastic piece 240 is fixedly connected with the bottom in the sliding cavity N1, when the lock block 220 moves towards the sliding cavity N1 through the sliding column 230, the elastic piece 240 is compressed to move, the elastic piece 240 stores energy, and when the lock block 220 moves towards the outside of the sliding cavity N1 through the sliding column 230, the elastic piece 240 releases the stored energy to enable the lock block to move rapidly; the locking piece 220 cannot enter the sliding cavity N1, which may be caused by the size of the locking piece 220, or by the action of the elastic member 240, when the sliding column 230 moves to the maximum position in the sliding cavity N1, the locking piece 220 is still located outside the sliding cavity N1.

Example 2

Referring to fig. 1 to 5, this embodiment is different from the above embodiment in that the locker 100 includes a lock body 110 and a mounting seat 120, the lock body 110 is disposed on a cabinet door 410 through the mounting seat 120, wherein the mounting seat 120 is cylindrical, a baffle is disposed at one end of the mounting seat 120, a circular hole matched with the mounting seat 120 is formed on the cabinet door 410, the mounting seat 120 is inserted into the circular hole and fixedly connected with the cabinet door 410 through the baffle, and the baffle is located at an outer side of the cabinet door 410 and is also an insertion hole of an unlocking tool;

it should be noted that the operating assembly 300 includes a push block 310 located on the lock body 110 and an auxiliary block 320 located on the lock member 200, the auxiliary block 320 is fixedly connected to the lock member 200, and the push block 310 is movably disposed on the lock body 110; the auxiliary block 320 is provided with an inclined plane P1, and the push block 310 is provided with a coupling plane P2 matched with the inclined plane P1; the position of the push block 310 on the lock body 110 is located between the cabinet door 410 and the lock block 220, and the coupling plane P2 is inclined toward the lock block 220, specifically, one end of the coupling plane P2 away from the cabinet door 410 is away from the lock block 220, and the other end of the coupling plane P2 close to the cabinet door 410 is close to the lock block 220; correspondingly, the inclined plane P1 and the coupling plane P2 can be attached to each other, one end of the inclined plane P1, which is far away from the cabinet door 410, is close to the push block 310, and the other end of the inclined plane P1, which is close to the cabinet door 410, is far away from the push block 310; at this time, when the pushing block 310 moves away from the cabinet door 410, after the coupling surface P2 contacts the inclined surface P1, the locking block 220 is pushed to slide away from the lock body 110 by the extrusion between the inclined surface P1 and the coupling surface P2, so that the locking block 220 is separated from the jack S1, and the purpose of unlocking is achieved; at this time, when the locking block 220 moves into the sliding cavity N1 through the sliding column 230, the elastic element 240 is compressed to move, and the elastic element 240 stores energy; when the force applied to the pushing block 310 is released, the elastic member 240 releases the stored energy, and the locking block 220 moves out of the sliding chamber N1 through the sliding column 230.

Example 3

Referring to fig. 6 to 8, this embodiment is different from the above embodiment in that an extension chamber N2 is provided in the mounting seat 120, the extension chamber N2 forms an opening at the baffle, the opening is an insertion port of the unlocking tool, and the inner bottom of the extension chamber N2 is closed; one end of the lock body 110 is positioned in the extension cavity N2, the other end of the lock body 110 penetrates through the bottom in the extension cavity N2 and extends out of the extension cavity N2, and the plug hole S1 is positioned at the extending end part of the lock body 110; because lock body 110 is fixed in on cabinet door 410 through the installation of mount pad 120, drive the removal of lock body 110 through opening and shutting of cabinet door 410, move to jack S1 and the corresponding position of locking piece 200 when lock body 110, make locking piece 200 stretch into in the jack S1 through operation subassembly 300, realize the purpose of locking, cabinet door 410 can't outwards be opened.

It should be noted that the push block 310 is frustum-shaped and is sleeved outside the lock body 110, and the frustum-shaped of the push block 310 is contracted towards one end far away from the cabinet door 410; the push block 310 is provided with a through hole for the lock body 110 to pass through, and the push block 310 is sleeved outside the lock body 110 through the through hole and can move along the outer surface of the lock body 110 through the through hole; when the pushing block 310 moves in a direction away from the cabinet door 410, the tapered outer side surface of the pushing block 310 contacts the inclined surface P1, and the locking block 220 is pushed to slide in a direction away from the lock body 110 by squeezing the inclined surface P1 and the coupling surface P2, so that the locking block 220 is separated from the jack S1, the purpose of unlocking is achieved, and the cabinet door 410 is opened outwards at the moment.

Example 4

Referring to fig. 6 to 8, this embodiment is different from the above embodiment in that, it should be further explained that, the lock body 110 includes a sliding part 111 and an operating part 112, the bottom of the extension cavity N2 is provided with a sliding hole N3 matching with the sliding part 111, and the sliding part 111 passes through the sliding hole N3; the size of the operating part 112 is larger than that of the sliding part 111, and the operating part 112 plays a role of a stop and defines the maximum moving position of the sliding part 111; the operation part 112 is located in the extension cavity N2, the length of the extension cavity N2 is greater than that of the operation part 112, that is, the operation part 112 is hidden in the extension cavity N2, because the operation part 112 is hidden in the extension cavity N2, a general tool cannot directly push the operation part 112;

it should be further noted that the operating part 112 is preferably cylindrical, the inner diameter of the extension cavity N2 is larger than the diameter of the operating part 112, and a gap is left between the inner wall of the extension cavity N2 and the operating part 112, and the gap is used for inserting an unlocking tool into the extension cavity N2; the bottom of the extension cavity N2 is further provided with a through hole N4, the axial projection of the push block 310 covers the through hole N4, an unlocking tool is inserted into the extension cavity N2 and can penetrate through the through hole N4 and contact the push block 310, the push block 310 is pushed by the unlocking tool to move along the sliding portion 111 and is pushed to move towards the direction away from the cabinet door 410, after the conical outer side face of the push block 310 is contacted with the inclined face P1, the lock block 220 is pushed to slide towards the direction away from the lock body 110 through the extrusion between the inclined face P1 and the coupling face P2, so that the lock block 220 is separated from the jack S1, and the unlocking purpose is achieved.

It should be noted that, in order to enable the push block 310 to stably move, the sliding portion 111 is further provided with a guide groove 111-1, the inner wall of the through hole of the push block 310 is provided with a slider matched with the guide groove 111-1, when the push block 310 moves, the slider guides and moves along the guide groove 111-1, so that the stable linear movement of the push block 310 can be ensured, meanwhile, the push block 310 does not rotate in the circumferential direction, the continuous stable contact between the tapered outer side surface of the push block 310 and the inclined surface P1 can be ensured, and the smooth unlocking process can be ensured.

Example 5

Referring to fig. 6 to 8, this embodiment is different from the above embodiment in that a stop block 113 is further disposed on the operating portion 112, a spring 114 is connected between the stop block 113 and the bottom of the extension chamber N2, that is, the lock body 110 is movable as a whole, the lock body 110 can be moved along the slide hole N3 as a whole through the sliding portion 111, the lock body 110 can move in the direction of compressing the spring 114, the spring 114 stores energy, and the maximum moving position of the lock body 110 is that the operating portion 112 contacts with the bottom inside the extension chamber N2, and after the acting force of the lock body 110 is released, the spring 114 releases the stored energy, so that the lock body 110 can be quickly reset; under the action of the pretightening force of the spring 114, in an initial state, a certain gap is left between the operating part 112 and the bottom in the extension cavity N2 to provide a certain moving distance; at this time, in the initial state, the operation part 112 moves to the outside of the extension chamber N2 by a certain distance, so the length of the extension chamber N2 is enough for the operation part 112 to move, that is, in the initial state, the end of the operation part 112 is still hidden in the extension chamber N2, so that a general tool cannot directly push the operation part 112.

In order to ensure the stable movement of the whole lock body 110, the sliding part 111 is provided with a guide groove 111-1, the slide hole N3 is provided with a guide block 115 matched with the guide groove 111-1, when the lock body 110 moves integrally, the mounting base 120 is fixedly mounted on the cabinet door 410, and the sliding part 111 moves along the guide block 115 through the guide groove 111-1, so that the stable movement of the whole lock body 110 is realized.

It should be further noted that the operating portion 112 is generally tapered, and since the tapered end of the operating portion 112 is located in the extending cavity N2, the operating portion 112 cannot be directly pushed by a general tool, and the end of the operating portion 112 is tapered, so that the contact area is small, which further increases the difficulty of the general tool in pushing the operating portion 112.

In this embodiment, a special unlocking tool needs to be matched to unlock the cabinet door lock, the special unlocking tool 500 is shown in fig. 9 and 10, the special unlocking tool 500 includes an unlocking cylinder 501, the diameter of the unlocking cylinder 501 is smaller than the inner diameter of the extension cavity N2, an extension rod 502 is arranged at one end of the unlocking cylinder 501, and the extension rod 502 can penetrate through a through hole N4 at the bottom of the extension cavity N2 and contact with the push block 310; the other end of the unlocking column 501 is provided with a handle 503, and the operation is facilitated through the handle 503; a concave cavity 504 is arranged at the end part of the unlocking column 501 positioned at the extension rod 502, the concave cavity 504 is matched with the conical end part of the operating part 112, the conical end part of the operating part 112 completely enters the concave cavity 504, meanwhile, the unlocking column 501 is contacted with the stop block 113 on the operating part 112, and at the moment, the special unlocking tool 500 is pushed, so that the whole lock body 110 can be pushed to move;

in order to enable the special unlocking tool 500 to be inserted smoothly, the outer wall of the operating part 112 is provided with a key groove 112-1 extending along the axial line, the inner wall of the concave cavity 504 is provided with a guide block 505 matched with the key groove 112-1 of the operating part 112, and when the special unlocking tool 500 is inserted into the extending cavity N2, the guide block 505 on the inner wall of the concave cavity 504 extends into the key groove 112-1 on the outer wall of the operating part 112 to move in a guiding mode, so that the special unlocking tool 500 can be inserted smoothly.

The working principle of the invention is as follows:

when the door 410 of the lock is locked, the special unlocking tool 500 is inserted into the extension cavity N2, the extension rod 502 passes through the through hole N4 at the bottom of the extension cavity N2 and contacts with the push block 310, the push block 310 is pushed to move forward to the farthest end, at this time, the unlocking cylinder 501 pushes the lock body 110 to compress the spring 114, in order to prevent the push block 310 from falling off the lock body 110, a stop block (not shown in the figure) is further arranged at the end of the sliding part 111; at this time, the cabinet door 410 is moved close to the cabinet body 420, the coupling surface P2 of the push block 310 contacts with the inclined surface P1 of the lock block 220 to push the lock block 220 to slide in the direction of compressing the elastic member 240 until the lock block 220 abuts against the side wall of the sliding portion 111, at this time, the cabinet door 410 is pushed while being withdrawn from the special unlocking tool 500, the lock block 220 moves on the side wall of the sliding portion 111 until the insertion hole S1 is formed, at this time, the special unlocking tool 500 is completely withdrawn, the lock block 220 is reset under the action of the elastic member 240 and extends into the insertion hole S1 to realize locking, and in a locked state, the lock member 200 extends into the insertion hole S1, at this time, the cabinet door 410 cannot be opened outwards, meanwhile, the cabinet door 410 contacts with the cabinet body 420, and the cabinet door 410 cannot move inwards;

when unlocking, the special unlocking tool 500 is inserted into the extension cavity N2, the extension rod 502 passes through the through hole N4 at the bottom of the extension cavity N2 and contacts with the push block 310, the push block 310 is pushed to move forward, the coupling surface P2 of the push block 310 contacts with the inclined surface P1 of the lock block 220 and then pushes the lock block 220 to slide in the direction of compressing the elastic element 240 until the lock block 220 is separated from the insertion hole S1, and at this time, the cabinet door 410 is opened outwards.

Because the operating part 112 of the present invention is hidden in the extending cavity N2, the operating part 112 cannot be directly pushed by a general tool, and further, the end of the operating part 112 is tapered, which increases the difficulty of pushing the operating part 112 by a general tool; even if the operation portion 112 can be pushed to move, the pushing block 310 cannot be pushed to move, and therefore the locking block 220 cannot slide towards the direction of compressing the elastic member 240, and the purpose of unlocking cannot be achieved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking means for switch board which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the lock catch device (100) comprises a lock body (110) and a mounting seat (120), wherein the lock body (110) is arranged on the cabinet door (410) through the mounting seat (120), and a jack (S1) is arranged on the lock catch device (100); and the number of the first and second groups,

the locking piece (200) is arranged in the cabinet body (420), and the locking piece (200) is connected with the insertion hole (S1) in an embedded mode;

an operating assembly (300) capable of separating the locking piece (200) from the jack (S1) is further arranged between the locking device (100) and the locking piece (200);

the operating assembly (300) comprises a push block (310) positioned on the lock body (110) and an auxiliary block (320) positioned on the locking piece (200), wherein an inclined surface (P1) is arranged on the auxiliary block (320), and a coupling surface (P2) matched with the inclined surface (P1) is arranged on the push block (310);

an extension cavity (N2) is arranged in the mounting seat (120), the lock body (110) is positioned in the extension cavity (N2), one end of the lock body (110) is positioned in the extension cavity (N2), the other end of the lock body (110) penetrates through the inner bottom of the extension cavity (N2) and extends out of the extension cavity (N2), and the jack (S1) is positioned at the end part of the lock body (110); the push block (310) is in a frustum shape and is sleeved on the outer side of the lock body (110);

the bottom of the extension cavity (N2) is also provided with a through hole (N4), and the axial projection of the push block (310) covers the through hole (N4).

2. A locking device for electrical distribution cabinets according to claim 1, characterized in that: the locking piece (200) comprises a base (210) and a locking block (220), the locking block (220) is connected with the base (210) in a sliding mode through a sliding column (230), and the operating assembly (300) can drive the locking block (220) to slide.

3. A locking device for electrical distribution cabinets according to claim 2, characterized in that: a sliding cavity (N1) is arranged in the base (210), the sliding column (230) is matched with the sliding cavity (N1), and an elastic piece (240) used for resetting the sliding column (230) is arranged in the sliding cavity (N1).

4. A locking device for a power distribution cabinet according to any one of claims 1 to 3, characterized in that: lock body (110) include sliding part (111) and operating portion (112), the bottom that extends chamber (N2) be equipped with sliding part (111) matched with slide opening (N3), operating portion (112) are located extend in chamber (N2), the length that extends chamber (N2) is greater than the length of operating portion (112), extend the inner wall in chamber (N2) with leave the clearance between operating portion (112).

5. A locking device for a distribution cabinet according to claim 4, characterized in that: the operating part (112) is further provided with a stop block (113), and a spring (114) is connected between the stop block (113) and the bottom of the extension cavity (N2).

6. A locking device for a distribution cabinet according to claim 5, characterized in that: the sliding part (111) is further provided with a guide groove (111-1), and a guide block (115) matched with the guide groove (111-1) is arranged in the sliding hole (N3).

7. The locking device for the distribution cabinet according to claim 6, characterized in that: the operating part (112) is generally conical, and a key groove (112-1) extending along the axis is formed in the outer wall of the operating part (112).