CN118156068A - Anti-electrified switching-on and switching-off device and anti-misoperation locking method of grounding switch type low-voltage distribution box - Google Patents

Abstract

The invention discloses an anti-misoperation locking method of an anti-electrification switching-on/off device and a grounding switch type low-voltage distribution box, which belongs to the technical field of power switch equipment and comprises an incoming line side isolating switch and an outgoing line side isolating switch which are respectively connected with an incoming line side and an outgoing line side of a circuit breaker; the control handle of the circuit breaker is connected with a self-locking device, the self-locking device is provided with a baffle plate and a limit hook, when the control handle is in a pull-down position, the limit hook can be in interference contact with the switch handle of the isolating switch in the pull-down position, and when the control handle is in a pull-up closing position, the two baffle plates are far away from each other to shield the corresponding switch handles in the closing positions at least partially in a covering mode. The invention can well realize the operation of the no-load switch, and is safe and reliable.

Description

Anti-electrified switching-on and switching-off device and anti-misoperation locking method of grounding switch type low-voltage distribution box

Technical Field

The invention relates to the field of power switching equipment, in particular to an anti-electrified switching-on and switching-off device and an anti-misoperation locking method of a grounding switch type low-voltage distribution box.

Background

With the continuous development of social economy, power supply plays a vital role in modern production and life, however, the frequent occurrence of power line construction safety accidents is a follow-up, particularly in the operation of power distribution network operation, maintenance and grounding operation, risks caused by improper operation directly cause serious life threat to operators and huge potential safety hazards to power supply facilities.

Therefore, how to perform safe switch control on the power supply side and the load side of the JP cabinet respectively, to implement the transfer maintenance and grounding of the power supply line side and the load side line, and to effectively prevent the on-load switching disconnecting switch, the on-load switching grounding switch, and the like is necessary for those skilled in the art, and it is necessary to further improve the safety level of operators and power grid equipment during power maintenance.

Disclosure of Invention

The invention aims at the defects of the prior art mentioned in the background art, thereby providing an anti-electrified switching-on/off device and an anti-misoperation locking method of a grounding switch type low-voltage distribution box, which are used for solving the problem that no-load switch operation can be safely and reliably performed when a power supply system is operated and maintained in the prior art.

In order to solve the technical problems, the invention specially provides the following technical scheme:

The invention provides an anti-electrification switching-on/off device, which comprises an incoming line side isolating switch and an outgoing line side isolating switch which are respectively connected with an incoming line side and an outgoing line side of a circuit breaker; the control handle of the circuit breaker is connected with a self-locking device, the self-locking device is provided with a baffle plate and a limit hook, when the control handle is in a pull-down position, the limit hook can be in interference connection with a switch handle of a disconnecting switch in the pull-down position, and when the control handle is in a pull-up closing position, the two baffle plates are far away from each other to shield the corresponding switch handles in the closing positions at least partially in a covering mode.

Further, the ground wires of the two isolating switches are connected to one ground bar below.

Further, the self-locking device also comprises a movable limiting plate and a sliding pin, wherein the movable limiting plate is vertically movably arranged in front of the circuit breaker, and is provided with a handle hole for the operating handle to pass through and two splayed guide strip holes on the left side and the right side of the separated handle hole; the limiting hooks are positioned at the left side and the right side of the movable limiting plate;

the bottom end of the baffle plate is hinged to the circuit breaker, and the upper part of the baffle plate is connected with a sliding pin which is installed in the guide strip hole in a sliding fit mode so as to be movably connected with the movable limiting plate.

Further, the self-locking device further comprises a spring, one end of the spring is connected to the sliding pin, and the other end of the spring is connected to the moving limiting plate.

Further, the self-locking device further comprises a limiting block, the limiting block is fixed on the circuit breaker, the top surface of the blocking piece is connected with the limiting block, and the blocking piece and the limiting block can be matched and installed in a relatively sliding mode.

Further, the upper portion of separation blade is rectangular plate structure, and is equipped with a plurality of holes, the spout of holding rectangular plate structure's top side is seted up to the bottom face of stopper, rectangular plate structure's top surface and the tank bottom sliding contact of spout.

Further, the tank bottom of the chute comprises a section of horizontal plane and a section of inclined slope surface connected with the horizontal plane, one end of the inclined slope surface far away from the horizontal plane extends upwards in a tilting mode, and when the operating handle is in an upward opening and closing position, the top surface of the rectangular structure is in fit contact with the horizontal plane, and one side of the rectangular structure covers at least one part of the switch handle.

Further, the limit hook comprises a horizontal plate section positioned below the isolating switch and a connecting arm connected to the bottom end of the movable limit plate, the connecting arm is integrally connected with the horizontal plate section to form a turning rod with a certain corner, and when the operating handle is operated to pull up to switch on, the horizontal plate section can be in contact with the switch handle in a pull-down position and cannot move upwards.

Further, the connecting arms are telescopic arms, and after the connecting arms are telescopic to the required length, the corresponding length can be fixedly maintained.

Further, the connecting arms comprise outer arms and inner arms which are provided with pattern drawing taper, wherein the outer arms are connected with the horizontal plate sections, the inner arms are inserted into the outer arms in a clearance fit manner, a plurality of slots are arranged on the inner walls of jacks, in which the inner walls of the outer arms are inserted, of the outer arms, all the slots are arranged at intervals along the axial direction of the jacks, and the depth direction of each slot is obliquely downward;

the surface of the inner arm is provided with an elastic sliding sheet, the elastic sliding sheet is obliquely arranged, the oblique direction of the elastic sliding sheet is consistent with the extending direction of the slot, the elastic sliding sheet is always in an extrusion state when contacting with the inner wall of the jack, and is clamped in the corresponding slot after sliding into the corresponding slot;

the inner arm is positioned outside the outer arm, a section of the inner arm is not provided with a drawing taper, a plurality of scale marks are arranged on the section of the inner arm along the length direction of the inner arm, and when the scale marks are inserted into the outer arm, the positions of the elastic sliding sheets can exactly slide into corresponding slots.

In addition, the invention also provides an anti-misoperation locking method of the grounding switch type low-voltage distribution box, the anti-electrified switching-on and switching-off device is adopted for operation, a switch handle of the wire inlet side isolating switch and the switch handle of the wire outlet side isolating switch are pushed up to the horizontal position of a cabinet body of the distribution box to switch on, the limiting hook at the bottom of the movable limiting plate moves upwards, and the movable limiting plate and the blocking piece drive the blocking piece to turn outwards under the limit of one guide strip hole; when the breaker is switched on in place, the blocking piece blocks the switch handle;

When the circuit breaker is in a closing position, if the two isolating switches are to be disconnected, the circuit breaker can be unlocked after being pulled down to be disconnected; when the two isolating switches are in the grounding position, the limiting hooks at the bottoms of the movable limiting blocks limit the movable limiting plates and cannot move upwards, so that the circuit breaker cannot be switched on, and the purpose of preventing switching on in the grounding state is achieved.

Compared with the prior art in the field, the invention has the following advantages in short: the invention well realizes the prevention of the on-load switching of the isolating switch and the prevention of the on-load switching of the grounding switch through a simple and reliable mechanical structure, thereby preventing the grounding power transmission and greatly improving the safety level of staff and power grid equipment.

The above technical effects, and other advantageous effects of the present invention will be discussed in detail in the following specific embodiments.

Drawings

In order to more clearly illustrate the core solution of the present invention, at least one embodiment based on the core concept of the present invention will be described below, possibly with the aid of the structural schematic diagrams required in the related art, but of course, the following figures are only some of the possible embodiments of the inventive concept, and some of the adaptive technical designs that may be represented can be developed by themselves according to these figures, without additional inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic front view of the present invention;

FIG. 3 is an enlarged partial view of the left side flap of the present invention;

FIG. 4 is a schematic view of an arrangement of guide bar holes;

FIG. 5 is a schematic view of the catch blocking the switch handle;

FIG. 6 is a specific block diagram of the limit hook;

fig. 7 is an enlarged view of the structure in the region of the oval thin line in fig. 6.

Reference numerals illustrate: the cabinet body 1, the grounding bar 2, the grounding wire 3, the outgoing line side isolating switch 4, the baffle 5, the rectangular plate-shaped structure 501, the limiting block 6, the horizontal plane 601, the inclined slope 602, the sliding chute 603, the moving limiting plate 7, the limiting hook 701, the horizontal plate section 70101, the connecting arm 70102, the guide strip hole 702, the operating handle 8, the circuit breaker 9, the incoming line side isolating switch 10, the switch handle 12, the sliding pin 13, the spring 14, the outer arm 15, the inner arm 16, the scale mark 17, the slot 18 and the elastic sliding sheet 19.

Detailed Description

In order to make the object and function achieved by the inventive features and technical means more clearly known, the related technical solutions of the present invention will be discussed in detail. It should be appreciated by those of ordinary skill in the art that what is described in all of the embodiments below is a matter of course, and that some possible or preferred implementations or methods of the invention are not all embodiments of the invention.

As shown in fig. 1-3, the present embodiment discloses an anti-charging opening and closing device, which mainly includes an inlet wire side, an inlet wire disconnecting switch and an outlet wire disconnecting switch respectively connected to the inlet wire side and the outlet wire side of a circuit breaker 9, and respectively and intensively controls the opening and closing of the corresponding inlet wire and outlet wire ends, meanwhile, most importantly, in the present embodiment, a self-locking device is particularly connected to the operating handle 8 of the circuit breaker 9 between the two, and the self-locking device has a pair of blocking plates 5 and a limiting hook 701, when the operating handle 8 is in a pull-down position, or for example, in a corresponding opening position of the circuit breaker 9, the limiting hook 701 can be in abutting connection with the switch handle 12 on the isolating switch in the pull-down position, at this time, the circuit breaker 9 cannot be actively pulled up for closing, so that before the closing operation of the circuit breaker 9 is required, the situation that the operating handle 8 cannot be pulled up, at this time, the situation that the operator is prevented from firstly closing the circuit breaker 9 and then is not switched on when the isolating switch is not in a wrong operation. Correspondingly, when the control handle 8 is in the pulled-up closing position, the two baffle plates 5 are away from each other to shield the corresponding switch handles 12 in the closing positions at least partially in a covering manner; that is: when the switch handle 12 of the disconnecting switch is pulled up to be closed, the limit hook 701 can move up due to the leaving of the switch handle 12, then the closing operation of the breaker 9 can be performed, and when the breaker 9 is closed and the disconnecting switch is powered, the disconnecting switch on one side cannot be directly realized by pulling down the switch handle 12, because after the limit hook 701 moves up, the two baffle plates 5 are already covered on the outer side of the switch handle 12, so that the switch handle 12 cannot be directly pulled down, and therefore, to pull down the switch handle 12 to realize the opening operation, or the operating handle 8 must be pulled down first, and after the breaker 9 is opened first, the baffle plates 5 are separated from the position covering the switch handle 12, thereby allowing the switch handle 12 to be pulled down.

In addition, the grounding wires 3 of the two isolating switches are respectively connected to one grounding bar 2 below the two isolating switches, so that the corresponding switch handle 12 is positioned at the grounding wire 3 when pulled down, and is far away from the grounding wire 3 when pulled up to be closed, thereby avoiding grounding in the closing power transmission state of the isolating switches and well preventing belt grounding power transmission.

As one of specific implementation structures, as shown in fig. 1-3, the self-locking device further includes a moving limiting plate 7 and a sliding pin 13, where the moving limiting plate 7 is located in front of the circuit breaker 9 and is vertically movably installed in front of the circuit breaker 9, for example, can move up and down parallel to the front surface of the circuit breaker 9, and meanwhile, a handle hole for passing through the operating handle 8 is formed in the moving limiting plate 7, so that the moving limiting plate 7 also moves up or down correspondingly in the process of switching on or off by moving the operating handle 8 of the circuit breaker 9 up and down. Meanwhile, two guide bar holes 702 are formed on the left side and the right side of the handle hole of the moving limiting plate 7 in a separated mode, as shown in fig. 4, the two guide bar holes 702 in a splayed arrangement are used for guiding the sliding pins 13 positioned in the guide bar holes to move, so that corresponding blocking pieces 5 are pushed to move according to a set path, specifically, the bottom ends of the blocking pieces 5 are hinged to the circuit breaker 9, and the upper parts of the blocking pieces are connected with the sliding pins 13 which are installed in the guide bar holes 702 in a sliding fit mode, so that loose joint between the blocking pieces 5 and the moving limiting plate 7 is achieved. In addition, the above-mentioned two limit hooks 701 are respectively located at the left and right sides of the movement limit plate 7 to respectively contact the switch handles 12 of the two disconnecting switches that are pulled down in place.

In order to better drive the baffle 5 to move, as shown in fig. 1-3, the self-locking device further comprises a spring 14, one end of the spring 14 is connected to the sliding pin 13, and the other end of the spring is connected to the movement limiting plate 7, and the specific arrangement structure can be selected adaptively, for example, when the spring 14 is a tension spring, the baffle 5 can slide along the guide bar hole 702 more stably when the limiting moving plate moves up and down.

As shown in fig. 1-3, in order to enable the baffle 5 to slide to the surface or the front of the isolating switch and to more stably block the switch handle 12 from being pulled down, the self-locking device further comprises a limiting block 6, wherein the limiting block 6 is fixed on the circuit breaker 9, the top surface of the baffle 5 is connected with the limiting block 6, and the two limiting blocks can be matched and installed in a sliding manner, so that when the limiting block 6 is moved upwards, the upper part of the baffle 5 is rotated by the hinge point of the baffle 5 and the circuit breaker 9 to approach the isolating switch on the side where the baffle 5 is located, the upper part of the baffle 5 is abutted by the limiting block 6, a certain limiting and fixing effect is achieved on the baffle 5 at the moment, and therefore, even if the switch handle 12 is pulled down with force, the baffle 5 is not pushed forwards, and a pressing force is provided on the front of the baffle 5 and above the baffle 5, so that the baffle 5 is correspondingly blocked and fixed.

More specifically, as shown in fig. 3 and 5, the upper part of the baffle 5 is a rectangular plate-shaped structure 501, the periphery of the baffle can be rounded, and a plurality of holes are formed for reducing weight, for example, two holes are arranged in parallel, and a special effect is that if the baffle 5 moves in a plane rather than being driven by the moving limiting plate 7, the lower half part of the limiting block 6 matched with the baffle can be positioned in the upper hole, so that the baffle 5 is allowed to move in a non-plane, the baffle 5 is prevented from being blocked and not reaching the front of the isolating switch, and the baffle can still keep the capability of moving towards the isolating switch when the installation and the matching are not accurate or the translation of the baffle 5 caused by abrasion due to long-term use can not be in a vertical plane any more. In specific practice, the bottom surface of the stopper 6 is provided with a sliding groove 603 for accommodating the top side surface of the rectangular plate-shaped structure 501, the top surface of the rectangular plate-shaped structure 501 is in sliding contact with the bottom of the sliding groove 603, and the lower half part of the stopper 6 mentioned above may be the part where the sliding groove 603 is located, i.e. the lower side of the stopper 6 is covered on the upper side of the baffle 5.

In actual manufacturing, as shown in fig. 5, the bottom of the chute 603 includes a section of horizontal plane 601 and a section of inclined slope 602 connected with the horizontal plane, one end of the inclined slope 602 away from the horizontal plane 601 extends upward, and when the operating handle 8 is in the pull-up switch-on position, the top surface of the rectangular structure is in contact with the horizontal plane 601, the instrument prevents the rectangular structure from moving upward to limit the direction, and one side of the rectangular structure, as shown in fig. 5, covers at least a part of the switch handle 12, for example, after the surface of the baffle 5 is insulated, a conductive sheet on the switch handle 12 can be blocked to rotate downward, or the insulated part of the switch handle 12 can be blocked directly, so that a person skilled in the art can select the design adaptively.

As another specific implementation structure, as shown in fig. 6, the limit hook 701 includes a horizontal plate section 70101 located below the isolating switch, and a connecting arm 70102 connected to the bottom end of the movement limiting plate 7, where the connecting arm 70102 is integrally connected with the horizontal plate section 70101 to form a turning rod with a certain corner, so as to form a hook portion, and when the operating handle 8 is operated to pull up and close, the horizontal plate section 70101 can be contacted with the switch handle 12 in the pull-down position, so that the whole movement limiting plate 7 cannot be moved up, that is, the operating handle 8 of the circuit breaker 9 cannot be pulled up and close.

Based on the above structure, as one of specific implementation details, the connecting arm 70102 is a telescopic arm, and after the connecting arm 70102 stretches to a required length, the connecting arm 70102 can be fixed to maintain a corresponding length, so that the connecting arm 70102 can adapt to different installation height positions, that is, different sizes of switch handles 12, and can better enable the blocking limiting hooks 701 to move upwards in combination with the moving limiting plates 7. Specifically, as shown in fig. 6, the connecting arm 70102 may include an outer arm 15 and an inner arm 16, both having a draft taper, where the outer arm 15 is connected to the horizontal plate segment 70101, and the inner arm 16 is inserted into the outer arm 15 in a clearance fit manner, and a plurality of slots 18 are provided on an inner wall of a jack into which the inner wall of the outer arm 15 is inserted, and all the slots 18 are arranged at intervals along an axial direction of the jack. As shown in fig. 7, the slot depth direction of the slot 18 is inclined downward, in practice, the number of slots 18 is determined according to the height position of the limit hooks 701, and because the operating handle 8 itself is to be switched on to have a certain length of travel, the adjustment of the length of the rough connecting arm 70102 with obvious gear steps can still be suitable for the requirements of the installation heights of different switch handles 12 or isolating switches. Meanwhile, the surface of the inner arm 16 is also provided with an elastic sliding sheet 19, the elastic sliding sheet 19 is obliquely arranged, the oblique direction is consistent with the extending direction of the slot 18, and the number of the elastic sliding sheets 19 is not too large, preferably one or two, because the elastic sliding sheets 19 are always in a pressed state when contacting with the inner wall of the jack, and are blocked in the corresponding slot 18 after sliding into the corresponding slot 18, when the inner arm 16 is pulled out, but the connecting arm 70102 needs to be shortened, and the inner arm 16 is difficult to insert. Therefore, only one or two slots 18 are correspondingly arranged at each position to be matched with one or two elastic sliding sheets 19, so that after the inner arm 16 is pulled out more easily, the elastic sliding sheets 19 are inserted in the positions which do not fall into the slots 18 when the outer arm 15 is inserted, after the inner arm 16 is inserted to a corresponding depth, the corresponding elastic sliding sheets 19 naturally spring into the corresponding slots 18 to realize fixation. In the manufacture, it is preferable that a section of the inner arm 16 located outside the outer arm 15 has no draft angle, for example, the section is a rectangular tube, and a plurality of graduation marks 17 are arranged on the section of the inner arm 16 along the length direction of the section, and the graduation marks 17 can correspond to the position of the elastic sliding piece 19 to slide into the corresponding slot 18 just when the inner arm 16 is inserted into the outer arm 15, so that it is easier to know when the inner arm 16 can be rotated to make the elastic sliding piece 19 naturally spring into the corresponding slot 18.

In practice, based on the above device, an anti-misoperation locking method for a grounding switch type low-voltage distribution box is mainly to operate by adopting the anti-electrification switching-on/off device, and push up the switch handles 12 of the incoming line side disconnecting switch 10 and the outgoing line side disconnecting switch 4 to the horizontal position of the cabinet body of the distribution box so as to switch on, at the moment, due to the push-up action of the operating handle 8 of the circuit breaker 9, the limiting hook 701 at the bottom of the movable limiting plate 7 is driven to move upwards, and the movable limiting plate 7 and the blocking piece 5 are driven to turn outwards under the limit of a guide strip hole 702, the guide strip hole 702 can be an arc-shaped bent strip hole, and when the circuit breaker 9 is switched on, the corresponding blocking piece 5 can block the switch handle 12 to prevent the blocking piece from being pulled down. When the circuit breaker 9 is in a closing position, if two isolating switches are to be disconnected, the circuit breaker 9 must be pulled down to be opened and then unlocked, when the two isolating switches are in a grounding position, the limiting hooks 701 at the bottom of the limiting block 7 are moved, so that the moving limiting plate 7 can be limited, and the circuit breaker 9 cannot move upwards, namely, the circuit breaker 9 cannot be closed at the moment, so that the aim of preventing closing in a grounding state is fulfilled, and error locking is realized.

It should be further noted that, throughout this specification, the word "comprise" and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or process, object, or method of claim, but also the inclusion of a stated element or process, object, device, or method, but also the inherent feature of that element or process, object, device, or method.

As those skilled in the art will clearly understand, any person skilled in the art, after fully understanding the technical principles of the present invention, may make an adaptive improvement design based on the above embodiments, or equivalent substitutions, so that these solutions do not deviate from the technical solutions of the core technical concept of the present invention, and are essentially included in the protection scope of the present invention.

Claims (10)

1. The anti-electrification switching-on and switching-off device is characterized by comprising an incoming line side isolating switch (10) and an outgoing line side isolating switch (4) which are respectively connected to an incoming line side and an outgoing line side of a circuit breaker (9); the automatic control device is characterized in that a self-locking device is connected to a control handle (8) of the circuit breaker (9), the self-locking device is provided with a baffle plate (5) and a limit hook (701), when the control handle (8) is in a pull-down position, the limit hook (701) can be in interference contact with a switch handle (12) of an isolating switch in the pull-down position, and when the control handle (8) is in a pull-up switch-on position, the two baffle plates (5) are far away from each other to shield the corresponding switch handles (12) in the switch-on positions in a covering mode.

2. The anti-electrification switching-on and switching-off device according to claim 1, characterized in that the ground wires (3) of the two disconnectors are connected to one ground bar (2) below.

3. The anti-electrification switching-on and switching-off device according to claim 1, characterized in that the self-locking device further comprises a movement limiting plate (7) and a sliding pin (13), wherein,

The movable limiting plate (7) is vertically movably arranged in front of the circuit breaker (9), and the movable limiting plate (7) is provided with a handle hole for the operating handle (8) to penetrate out and two splayed guide strip holes (702) on the left side and the right side of the separated handle hole; the limiting hooks (701) are positioned at the left side and the right side of the movable limiting plate (7);

The bottom end of the baffle (5) is hinged to the circuit breaker (9), and the upper part of the baffle is connected with the sliding pin (13) which is installed in the guide strip hole (702) in a sliding fit manner so as to be movably connected with the movable limiting plate (7).

4. An anti-electrification opening and closing device according to claim 3, characterized in that the self-locking device further comprises a spring (14), one end of the spring (14) is connected to the sliding pin (13), and the other end is connected to the movement limiting plate (7).

5. The anti-electrification opening and closing device according to claim 3, wherein the self-locking device further comprises a limiting block (6), the limiting block (6) is fixed on the circuit breaker (9), the top surface of the blocking piece (5) is connected with the limiting block (6), and the blocking piece and the limiting block can be matched and installed in a relatively sliding manner.

6. The anti-electrification switching-on and switching-off device according to claim 5, wherein the upper portion of the baffle plate (5) is a rectangular plate-shaped structure (501) and is provided with a plurality of holes, a sliding groove (603) for accommodating the top side surface of the rectangular plate-shaped structure (501) is formed in the bottom end surface of the limiting block (6), and the top surface of the rectangular plate-shaped structure (501) is in sliding contact with the groove bottom of the sliding groove (603).

7. The anti-electrification opening and closing device according to claim 6, wherein the bottom of the chute (603) comprises a horizontal plane (601) and an inclined slope (602) connected with the horizontal plane, one end of the inclined slope (602) away from the horizontal plane (601) extends upwards in a leaning manner, when the operating handle (8) is in an upward opening and closing position, the top surface of the rectangular structure is in abutting contact with the horizontal plane (601), and one side of the rectangular structure covers at least one part of the switch handle (12).

8. The anti-electrification switching-on/off device according to claim 6, wherein the limit hook (701) comprises a horizontal plate section (70101) below the isolating switch, and a connecting arm (70102) connected to the bottom end of the movable limit plate (7), the connecting arm (70102) is integrally connected with the horizontal plate section (70101) to form a turning lever with a certain corner, and when the operating handle (8) is operated to pull up and close, the horizontal plate section (70101) can be contacted with the switch handle (12) in a pull-down position and cannot move up.

9. The anti-electrification switching-on and switching-off device according to claim 8, wherein the connecting arm (70102) is a telescopic arm, and the connecting arm (70102) can be fixed to maintain a corresponding length after being telescopic to a required length;

The connecting arm (70102) comprises an outer arm (15) and an inner arm (16) which are both provided with a pattern drawing taper, wherein the outer arm (15) is connected with the horizontal plate section (70101), the inner arm (16) is inserted into the outer arm (15) in a clearance fit manner, a plurality of slots (18) are arranged on the inner wall of a jack, in which the inner wall of the jack is inserted, of the outer arm (15), all the slots (18) are arranged at intervals along the axial direction of the jack, and the groove depth direction of the slots (18) is obliquely arranged downwards;

the surface of the inner arm (16) is provided with an elastic sliding sheet (19), the elastic sliding sheet (19) is obliquely arranged, the oblique direction of the elastic sliding sheet is consistent with the extending direction of the slot (18), the elastic sliding sheet (19) is always in an extrusion state when being contacted with the inner wall of the jack, and is clamped in the corresponding slot (18) after sliding into the corresponding slot (18);

The section of the inner arm (16) positioned outside the outer arm (15) is not provided with a draft taper, a plurality of scale marks (17) are arranged on the section of the inner arm (16) along the length direction of the section of the inner arm, and when the scale marks (17) are inserted into the outer arm (15) corresponding to the inner arm (16), the position of the elastic sliding sheet (19) can exactly slide into the corresponding slot (18).

10. The anti-misoperation locking method of the grounding switch type low-voltage distribution box is characterized in that an anti-electrification switching-on/off device as claimed in any one of claims 1 to 9 is adopted to operate, a switch handle (12) of an incoming line side isolating switch (10) and an outgoing line side isolating switch (4) is pushed up to a horizontal position with a cabinet body of the distribution box to switch on, a limit hook (701) arranged at the bottom of a movable limit plate (7) moves upwards, and the movable limit plate (7) and a baffle (5) drive the baffle (5) to turn outwards under the limit of a guide strip hole (702); when the breaker (9) is switched on in place, the blocking piece (5) blocks the switch handle (12);

When the circuit breaker (9) is in a closing position, if two isolating switches are to be opened, the circuit breaker (9) must be pulled down to be opened and then can be unlocked;

when the two isolating switches are in the grounding position, the limiting hooks (701) at the bottoms of the movable limiting blocks (7) limit the movable limiting plates (7) and cannot move upwards, so that the circuit breaker (9) cannot be switched on, and the purpose of preventing switching on in the grounding state is achieved.