CN210535540U - Front and rear door interlocking mechanism of mining explosion-proof high-voltage distribution device - Google Patents

Abstract

The utility model discloses a front and back door interlocking mechanism of a mining flame-proof type high-voltage power distribution device, which comprises a cabinet body, wherein a bottom plate of an inner cavity of the cabinet body is rotatably provided with a front operating shaft and a back operating shaft, the front operating shaft and the back operating shaft are connected through a shaft coupling, a rotating shaft is fixed on a grounding disconnecting link, the rotating shaft is connected with the back operating shaft through a movable rod, and when the grounding disconnecting link is opened or closed, the rotating shaft can drive the back operating shaft to rotate through the movable rod; a front door interlocking device and a breaker stop block are arranged on the front operating shaft, and a rear door interlocking device is arranged on the rear operating shaft; when the grounding disconnecting link is switched on, the front door interlocking device and the rear door interlocking device are in an unlocked state, and meanwhile, the circuit breaker cannot move backwards to enter a working state; when the grounding disconnecting link is opened, the front door interlocking device and the rear door interlocking device are both in a locking state, and meanwhile, the circuit breaker can move backwards to enter a working state. The utility model discloses the advantage: the integrated interlocking of the front door, the rear door, the circuit breaker and the grounding disconnecting link is arranged, so that the safety of the equipment is ensured.

Description

Front and rear door interlocking mechanism of mining explosion-proof high-voltage distribution device

Technical Field

The utility model belongs to the technical field of high-voltage electrical equipment technique and specifically relates to a door interlocking device around mining flame-proof type high voltage distribution device.

Background

The mining explosion-proof high-voltage power distribution device is one kind of mining high-voltage electrical equipment and is widely used under a mine. The underground working environment of the coal mine is severe, and faults such as overvoltage, undervoltage, overload, short circuit, electric leakage, cable damage and the like often occur in a high-voltage power grid. In addition, the electric arc and the electric spark which appear at the grounding point of the short circuit to the ground can cause coal dust and gas explosion, thereby directly endangering the personal safety and the safety production of coal mines and generating huge damage. The mining high-voltage electrical equipment is key equipment for ensuring normal operation of a high-voltage power grid, and the key point for ensuring normal operation of the equipment is that the electricity consumption of the whole mine is normal. Due to the complex mine underground environment, the mining electrical equipment often breaks down, and at the moment, operation and maintenance personnel are required to carry out power failure maintenance on the mining electrical equipment. In the process of power failure maintenance, the ground wire is additionally arranged for coping with the possible incoming call condition, and the accident that the maintenance personnel hang the ground wire in an electrified way is often easy to happen. The maintenance personnel are simply required to perform power failure maintenance on the mining high-voltage electrical equipment according to a certain program, and the life safety of the maintenance personnel is difficult to guarantee, so that the design of a good misoperation prevention interlocking mechanism is very important. The existing mining explosion-proof high-voltage power distribution device is not provided with a grounding switch in a cabinet body, when a maintainer needs to overhaul equipment, a grounding wire can be additionally arranged, and the grounding wire is dismantled after overhaul, so that the device is very inconvenient and lacks safety. At present, due to the complexity of the structure and the particularity of the use environment, the mining explosion-proof high-voltage power distribution device is not perfect in the aspect of design of an anti-misoperation interlocking mechanism, and the mining explosion-proof high-voltage power distribution device on the market is usually in interlocking of a front door and a circuit breaker, lacks of interlocking design of the front door and a rear door, and lacks of interlocking design of a grounding disconnecting link and the circuit breaker.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a door interlocking mechanism around mining flame-proof type high voltage distribution device, through the integration interlocking that sets up qianmen, back door, circuit breaker and ground connection switch to guarantee the security performance of equipment.

The utility model discloses a realize through following technical scheme:

a front door and rear door interlocking mechanism of a mining explosion-proof high-voltage power distribution device comprises a cabinet body, wherein an inner cavity of the cabinet body is divided into a front cavity and a rear cavity by a partition plate, the front side of the front cavity and the rear side of the rear cavity are respectively closed through a front door and a rear door, a grounding knife switch is arranged in the rear cavity, a front operating shaft and a rear operating shaft which extend along the front-rear direction are rotatably arranged on a bottom plate of the inner cavity of the cabinet body, the front operating shaft and the rear operating shaft are connected together through a coupler, a rotating shaft is fixed on the grounding knife switch, the rotating shaft is connected with the rear operating shaft through a movable rod, two ends of the movable rod are respectively rotatably connected with the rotating shaft and the rear operating shaft, and when the grounding knife switch is opened or closed, the rotating shaft can drive the rear operating shaft to rotate;

the front end of the front operating shaft extends forwards out of a front door, a front door interlocking device and a breaker stop block are arranged on the front operating shaft, the front door interlocking device is arranged at a position close to the front end of the front operating shaft and positioned on the inner side of the front door, the breaker stop block is arranged at the middle section of the front operating shaft, a rear door interlocking device is arranged on the rear operating shaft, and the rear door interlocking device is positioned on the inner side of the rear door;

when the grounding disconnecting link is in a closing state, the front door interlocking device and the rear door interlocking device are both in an unlocking state, and meanwhile, the breaker stop block protrudes towards the direction of the breaker chassis, so that the front door and the rear door can be opened after unlocking, and meanwhile, due to the blocking of the breaker stop block, the breaker on the breaker chassis cannot move backwards to enter a working state;

when the earthing knife-switch is in the state of opening the floodgate, preceding door interlock, back door interlock all are in the locking state, and the circuit breaker dog leaves circuit breaker chassis car simultaneously, and the back door is all locked behind the front door this moment, simultaneously because not blockking of circuit breaker dog, the circuit breaker on the circuit breaker chassis car can move backward and get into operating condition.

Furthermore, the rear door interlocking device comprises a fixed shell, a sliding block, a guide rod, a first spring and a rotating piece, wherein the fixed shell is fixed on the bottom plate, a cavity for the rear operating shaft to pass through is formed in the fixed shell, a shaft sleeve is fixedly arranged on the rear operating shaft and is positioned on the rear side of the fixed shell, the shaft sleeve and the cavity of the fixed shell are butted to form an accommodating cavity, the first spring and the sliding block which are arranged in the front and back are sleeved on the rear operating shaft in a sliding mode are positioned in the accommodating cavity, the sliding block is tightly abutted in the shaft sleeve through the first spring, the guide rod fixed at the top end of the sliding block extends out of the strip-shaped notch at the top end of the fixed shell and can slide in the strip-shaped notch, the guide rod extends out of the strip-shaped notch and then extends backwards, and the rear end of the guide rod protrudes out of the rear end; a protruding rotating sheet is arranged on one side of the rear end of the rear operating shaft;

when the grounding disconnecting link is in a switching-off state, the rotating sheet is positioned on one side of the rear operating shaft and protrudes laterally to be matched and clamped with the rear clamping block of the rear door, and at the moment, the guide rod drives the sliding block to slide forwards along the rear operating shaft due to the pushing of the rear door, so that the first spring is in a compressed state;

when the grounding disconnecting link is in a closing state, the rotating sheet is positioned at the top of the rear operating shaft and protrudes upwards to be separated from a rear clamping block on the inner side of the rear door, the rear door is in an unlocking state, and meanwhile, under the action of the elastic force of the first spring, the guide rod slides backwards along the rear operating shaft, and the rear end of the guide rod jacks the rear door.

Furthermore, a plurality of convex ribs extending along the axial direction are arranged on the circumferential direction of the sliding block, grooves in sliding fit with the convex ribs are formed in the inner side wall of the shaft sleeve, when the sliding block is located at the rear limit position, the convex ribs and the grooves are in one-to-one corresponding insertion fit, and at the moment, the rear operating shaft cannot rotate relative to the sliding block; when the sliding block is located at the front limit position, the plurality of convex ribs are separated from the plurality of grooves, and the rear operating shaft can rotate relative to the sliding block.

Furthermore, the front door interlocking device comprises a support frame, a pin hook rod, a shifting rod and a second spring, the support frame is fixed on the bottom plate, the middle part of the pin hook rod is hinged to the support frame, a front clamping piece capable of being matched and clamped with a front clamping block on the inner side of the front door is arranged at the front end of the pin hook rod, a blocking seat is arranged at the rear end of the pin hook rod, the second spring is connected between the bottom of the front section of the pin hook rod and the support frame, the shifting rod is fixedly sleeved on the front operating shaft at a position corresponding to the blocking seat, and the shifting rod can rotate along with the rotation of the front operating shaft;

when the grounding knife switch is in a switch-off state, the shifting lever presses the baffle seat downwards, so that the front clamping piece at the front end of the pin hook rod is turned upwards and clamped with the front clamping block of the front door, and the second spring is in a stretching state;

when the grounding knife switch is in a closing state, the shifting lever turns upwards to separate from the blocking seat, and under the action of the elastic force of the second spring, the pin hook rod is pulled to turn downwards to separate the front clamping piece from the front clamping block of the front door.

Furthermore, the front door interlocking device further comprises a support column, wherein the support column is located below the rear section of the pin hook rod and used for supporting the rear section of the pin hook rod which turns downwards.

Further, the front operating shaft and the rear operating shaft are rotatably supported by bearing blocks fixed to the base plate, respectively.

Furthermore, the front end of the front operating shaft extends forwards out of the front door and is provided with a hexagonal block.

Compared with the prior art, the utility model has the following advantages:

the utility model provides a pair of door interlocking mechanism around mining flame-proof type high voltage distribution device, through interlocking mechanism's optimal design, realize ground connection switch and equipment integration, realized simultaneously that the mistake of preventing of mining flame-proof type high voltage distribution device's qianmen, back door, circuit breaker and ground connection switch locks the design, realized logical rigorous mechanical interlocking, have safe and reliable, the advantage that efficiency improves, guaranteed personnel's property life safety well.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is an enlarged view at I of fig. 1.

Fig. 3 is a top view of the fitting portion of the rear latch and the rotor of the rear door of the present invention.

Fig. 4 is a perspective view of the grounding switch of the present invention in a closing state.

Fig. 5 is a front view of the front door interlock portion of the grounding switch of the present invention in the closed state.

Fig. 6 is a longitudinal sectional view of the rear door interlock device portion when the earthing switch of the present invention is in a closing state.

Fig. 7 is a schematic diagram of the cooperation between the slider and the shaft sleeve when the earthing switch of the present invention is in the closing state.

Fig. 8 is a perspective view of the earthing switch of the present invention in the open state.

Fig. 9 is a front view of the front door interlock portion of the grounding switch of the present invention in the open position.

Fig. 10 is a longitudinal sectional view of the rear door interlock portion of the earthing switch of the present invention in the open state.

Fig. 11 is a schematic view of the cooperation between the slider and the shaft sleeve when the earthing switch of the present invention is in the open state.

Reference numbers in the figures: 1-cabinet body, 2-front door, 3-circuit breaker, 4-circuit breaker chassis, 5-front door interlocking device, 51-support frame, 52-pin hook rod, 53-deflector rod, 54-second spring, 55-support column, 56-front clamping piece, 57-baffle seat, 6-bottom plate, 7-rear door interlocking device, 71-fixed shell, 72-slider, 73-guide rod, 74-first spring, 75-shaft sleeve, 76-strip-shaped notch, 77-rotor, 78-convex rib, 79-groove, 8-rear cavity, 9-grounding knife switch, 10-baffle plate, 11-rear door, 12-front operating shaft, 13-rear operating shaft, 14-coupler, 15-bearing seat, 16-hexagonal block, 17-rotating shaft, 18-movable rod, 19-circuit breaker stop block, 20-rear clamping block and 21-front clamping block.

Detailed Description

The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Referring to fig. 1 to 11, the embodiment discloses a front and rear door interlocking mechanism of a mining explosion-proof high-voltage power distribution device, the mining explosion-proof high-voltage power distribution device comprises a cabinet body 1, an inner cavity of the cabinet body 1 is divided into a front cavity and a rear cavity 8 by a partition plate 10, the front side of the front cavity and the rear side of the rear cavity 8 are respectively closed through a front door 2 and a rear door 11, a grounding knife switch 9 is arranged in the rear cavity 8, a front operating shaft 12 and a rear operating shaft 13 which extend in the front-rear direction are rotatably arranged on a bottom plate 6 of the inner cavity of the cabinet body 1, the front operating shaft 12 and the rear operating shaft 13 are connected together through a coupler 14, and the front operating shaft 12 and the rear operating shaft 13 are respectively rotatably supported through. The front end of the front operating shaft 12 projects forward out of the front door 2 and is provided with a hexagonal block 16. A rotating shaft 17 is fixed on the grounding disconnecting link 9, the rotating shaft 17 is connected with the rear operating shaft 13 through a movable rod 18, two ends of the movable rod 18 are respectively connected with the rotating shaft 17 and the rear operating shaft 13 in a rotating manner, and when the grounding disconnecting link 9 is opened or closed, the rotating shaft 17 can drive the rear operating shaft 13 to rotate through the movable rod 18.

The front end of the front operating shaft 12 extends forwards out of the front door 2, the front door interlocking device 5 and the breaker stop 19 are arranged on the front operating shaft 12, the front door interlocking device 5 is arranged at a position close to the front end of the front operating shaft 12 and located on the inner side of the front door 2, the breaker stop 19 is arranged at the middle section of the front operating shaft 12, the rear operating shaft 13 is provided with the rear door interlocking device 7, and the rear door interlocking device 7 is located on the inner side of the rear door 11.

When the grounding switch 9 is in a closing state, the front door interlocking device 5 and the rear door interlocking device 7 are both in an unlocking state, meanwhile, the circuit breaker stop block 19 protrudes towards the circuit breaker chassis 4, the front door 2 and the rear door 11 can be unlocked and opened at the moment, and meanwhile, due to the blocking of the circuit breaker stop block 19, the circuit breaker 3 on the circuit breaker chassis 4 cannot move backwards to enter a working state.

When the grounding disconnecting link 9 is in an open state, the front door interlocking device 5 and the rear door interlocking device 7 are both in a locking state, meanwhile, the breaker stop block 19 leaves the breaker chassis 4, the rear door 11 of the front door 2 is locked, and meanwhile, due to the fact that the breaker stop block 19 does not block, the breaker 3 on the breaker chassis 4 can move backwards to enter a working state.

Specifically, the rear door interlocking device 7 comprises a fixed shell 71, a sliding block 72, a guide rod 73, a first spring 74 and a rotating sheet 77, wherein the fixed shell 71 is fixed on the bottom plate 6, a cavity for the rear operating shaft 13 to pass through is arranged in the fixed shell 71, a shaft sleeve 75 is fixedly arranged on the rear operating shaft 13, the shaft sleeve 75 is positioned at the rear side of the fixed shell 71, the shaft sleeve 75 and the cavity of the fixed shell 71 are butted to form an accommodating cavity, the first spring 74 and the sliding block 72 which are arranged in a front-back mode are sleeved on the rear operating shaft 13 in a sliding mode and are positioned in the accommodating cavity, the slide block 72 is tightly pressed in the shaft sleeve 75 through a first spring 74, a guide rod 73 fixed at the top end of the slide block 72 extends from a strip-shaped notch 76 at the top end of the fixed shell 71 and can slide in the strip-shaped notch 76, the guide rod 73 extends backwards after extending out of the strip-shaped notch 76, in a natural state, the rear end of the guide rod 73 protrudes beyond the rear end of the rear operating shaft 13; a projecting rotating piece 77 is provided on the rear end side of the rear operating shaft 13. The sliding block 72 is circumferentially provided with a plurality of ribs 78 extending along the axial direction, the inner side wall of the shaft sleeve 75 is provided with grooves 79 matched with the plurality of ribs 78 in a sliding manner, when the sliding block 72 is positioned at the rear limit position, the plurality of ribs 78 are matched with the plurality of grooves 79 in a one-to-one corresponding insertion manner, and at the moment, the rear operating shaft 13 cannot rotate relative to the sliding block 72; when the slider 72 is at the front limit position, the ribs 78 are disengaged from the grooves 79, and the rear operating shaft 13 is rotatable with respect to the slider 72.

When the earthing knife-switch 9 is in the switch-off state, the rotating piece 77 is positioned at one side of the rear operating shaft 13 and protrudes laterally to be matched and clamped with the rear clamping block 20 of the rear door 11, at this time, due to the pushing of the rear door 11, the guide rod 73 drives the sliding block 72 to slide forwards along the rear operating shaft 13, so that the first spring 74 is in a compressed state;

when the earthing knife-switch 9 is in a closing state, the rotating piece 77 is located at the top of the rear operating shaft 13 and protrudes upwards to be separated from the rear latch 20 on the inner side of the rear door 11, the rear door 11 is in an unlocking state, and simultaneously, under the elastic force of the first spring 74, the guide rod 73 slides backwards along the rear operating shaft 13, and the rear end of the guide rod 73 pushes the rear door 11 open. When the rear door 11 is in an open state, the first spring 74 pushes the slider 72 and the guide rod 73 to slide backwards to a rear limit position, at the moment, the plurality of ribs 78 and the plurality of grooves 79 are in one-to-one corresponding insertion fit, and the rear operating shaft 13 cannot rotate relative to the slider 72, so that the grounding knife switch 9 is always in a closed state, and the electric shock of an overhaul worker in the cabinet is prevented. The situation that the rear door 11 is not closed and the grounding switch 9 is opened is prevented, and the safety of maintainers is guaranteed.

Specifically, front door interlock 5 includes support frame 51, round pin hook pole 52, driving lever 53, No. two springs 54, support column 55, support frame 51 and support column 55 are fixed on bottom plate 6, round pin hook pole 52 middle part articulates on support frame 51, round pin hook pole 52 front end is equipped with the preceding card 56 that can cooperate the joint with the preceding fixture block 21 of front door 2 inboard, be equipped with on the back end of round pin hook pole 52 and keep off seat 57, No. two springs 54 connect between round pin hook pole 52 anterior segment bottom and support frame 51, driving lever 53 is fixed to be equipped with at the position that corresponds to keeping off seat 57 on preceding operating axis 12, driving lever 53 can rotate along with preceding operating axis 12 rotates. The support column 55 is located below the rear section of the pin hooking rod 52 for supporting the rear section of the pin hooking rod 52 turned downward.

When the earthing knife switch 9 is in the switch-off state, the shift lever 53 presses the stop seat 57 downwards, so that the front clamping piece 56 at the front end of the pin hook rod 52 is turned upwards and clamped with the front clamping piece 21 of the front door 2, the front door 2 is in the locking state, and the second spring 54 is in the stretching state at the moment.

When the earthing knife switch 9 is in a closed state, the shift lever 53 is turned upwards to be separated from the stopper seat 57, and under the action of the elastic force of the second spring 54, the pin hook rod 52 is pulled to be turned downwards so that the front clamping piece 56 is separated from the front clamping block 21 of the front door 2, and the front door 2 is in an unlocked state.

The operation process of the interlocking mechanism disclosed in the embodiment is as follows, and when in use, the interlocking mechanism is divided into the following two conditions:

the first state is a state converted from a working state to a power-off maintenance state, as shown in fig. 4 to 7, when power-off maintenance is needed, the circuit breaker 3 is disconnected, the circuit breaker 3 moves forwards from the working position to a maintenance position, and in order to ensure the safety of personnel, the front operating shaft 12 and the rear operating shaft 13 are driven to rotate by rotating the hexagonal block 16, and then the rotating shaft 17 is driven to rotate by the movable rod 18, so that the grounding switch 9 is converted from a switch-off state to a switch-on state. Meanwhile, due to the rotation of the front operating shaft 12, the stop block stops the circuit breaker 3 from moving backwards to enter a working state, at the moment, the rotating sheet 77 protrudes upwards to be separated from the rear fixture block 20 of the rear door 11, the rear door 11 is in an unlocking state, and the rear door 11 is opened; meanwhile, due to the rotation of the front operating shaft 12, the shifting lever 53 is turned upwards to leave the blocking seat 57, under the pulling force of the second spring 54, the front end of the pin hook rod 52 is turned downwards, the front clamping piece 56 is separated from the front clamping block 21 of the front door 2, so that the front door 2 can be opened, and the interlocking design of the front door 2, the rear door 11, the circuit breaker 3 and the grounding switch 9 is realized.

The second state is a state converted from a power-off maintenance state to a working state, as shown in fig. 8 to 11, when the maintenance is finished and normal work is required, the rear door 11 is closed first, the rear door 11 pushes the guide rod 73 and the slide block 72 to move forward, the rotation relation between the rear operating shaft 13 and the slide block 72 is unlocked, and the rear operating shaft 13 can rotate freely. Then, the front operating shaft 12 and the rear operating shaft 13 are driven to rotate reversely by reversely rotating the hexagonal block 16, and the rotating shaft 17 is driven to rotate reversely by the movable rod 18, so that the grounding switch 9 is changed from a closing state to an opening state. Meanwhile, due to the rotation of the front operating shaft 12, the stop block is turned to be protruded upwards, and the circuit breaker 3 is not stopped from entering a working state any more; meanwhile, due to the rotation of the rear operating shaft 13, the rotating piece 77 on the rear operating shaft 13 protrudes laterally to be clamped and matched with the rear clamping block 20 on the inner side of the rear door 11, so that the locking of the rear door 11 is realized; meanwhile, due to the rotation of the front operating shaft 12, the shift lever 53 presses the stopper seat 57, so as to drive the pin hook rod 52 to turn over, so that the front clamping piece 56 at the front end of the pin hook rod 52 hooks the front clamping block 21 on the inner side of the front door 2, and the support column 55 supports the pin hook rod 52, so that the stability is realized, and finally the locking of the front door 2 is realized. The interlocking design of the front door 2, the rear door 11, the circuit breaker 3 and the grounding disconnecting link 9 is realized through the design.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. The utility model provides a door interlocking device around mining flame-proof type high voltage power distribution unit, mining flame-proof type high voltage power distribution unit includes the cabinet body (1), the cabinet body (1) inner chamber is separated for antechamber and back chamber (8) by baffle (10), antechamber front side, back chamber (8) rear side are closed through qianmen (2) and back door (11) respectively, be equipped with ground connection switch (9), its characterized in that in back chamber (8): the cabinet is characterized in that a front operating shaft (12) and a rear operating shaft (13) extending in the front-rear direction are rotatably arranged on a bottom plate (6) of an inner cavity of the cabinet body (1), the front operating shaft (12) and the rear operating shaft (13) are connected together through a coupler (14), a rotating shaft (17) is fixed on the grounding disconnecting link (9), the rotating shaft (17) is connected with the rear operating shaft (13) through a movable rod (18), two ends of the movable rod (18) are respectively rotatably connected with the rotating shaft (17) and the rear operating shaft (13), and when the grounding disconnecting link (9) is opened or closed, the rotating shaft (17) can drive the rear operating shaft (13) to rotate through the movable rod (18);

the front end of the front operating shaft (12) extends forwards out of the front door (2), the front operating shaft (12) is provided with a front door interlocking device (5) and a breaker stop block (19), the front door interlocking device (5) is arranged at a position close to the front end of the front operating shaft (12) and positioned on the inner side of the front door (2), the breaker stop block (19) is arranged at the middle section of the front operating shaft (12), the rear operating shaft (13) is provided with a rear door interlocking device (7), and the rear door interlocking device (7) is positioned on the inner side of the rear door (11);

when the grounding disconnecting link (9) is in a closing state, the front door interlocking device (5) and the rear door interlocking device (7) are both in an unlocking state, meanwhile, the breaker stop block (19) protrudes towards the breaker chassis (4), the front door (2) and the rear door (11) can be unlocked and opened, and meanwhile, due to the blocking of the breaker stop block (19), the breaker (3) on the breaker chassis (4) cannot move backwards to enter a working state;

when earthing knife-switch (9) is in the state of opening the floodgate, qianmen interlock (5), back door interlock (7) all are in locking state, and circuit breaker dog (19) leave circuit breaker chassis car (4) simultaneously, and qianmen (2) back door (11) all are locked this moment, simultaneously because do not have blockking of circuit breaker dog (19), circuit breaker (3) on circuit breaker chassis car (4) can move backward and get into operating condition.

2. The interlocking mechanism for the front door and the rear door of the mining explosion-proof high-voltage distribution device according to claim 1 is characterized in that: the rear door interlocking device (7) comprises a fixed shell (71), a sliding block (72), a guide rod (73), a first spring (74) and a rotating sheet (77), wherein the fixed shell (71) is fixed on the bottom plate (6), a cavity for the rear operating shaft (13) to pass through is formed in the fixed shell (71), a shaft sleeve (75) is fixedly arranged on the rear operating shaft (13), the shaft sleeve (75) is positioned at the rear side of the fixed shell (71), the shaft sleeve (75) and the cavity of the fixed shell (71) are butted to form an accommodating cavity, the first spring (74) and the sliding block (72) which are arranged in the front and back are sleeved on the rear operating shaft (13) in a sliding mode are both positioned in the accommodating cavity, the sliding block (72) is abutted against the shaft sleeve (75) through the first spring (74), the guide rod (73) fixed at the top end of the sliding block (72) extends out of a strip-shaped notch (76) at the top end of the fixed shell (71) and can slide in the strip-shaped notch, the guide rod (73) extends out of the strip-shaped notch (76) and then extends backwards, and the rear end of the guide rod (73) protrudes out of the rear end of the rear operating shaft (13) in a natural state; one side of the rear end of the rear operating shaft (13) is provided with a convex rotating sheet (77);

when the grounding disconnecting link (9) is in a switching-off state, the rotating sheet (77) is positioned on one side of the rear operating shaft (13) and protrudes laterally to be matched and clamped with the rear clamping block (20) of the rear door (11), and at the moment, due to the pushing of the rear door (11), the guide rod (73) drives the sliding block (72) to slide forwards along the rear operating shaft (13), so that the first spring (74) is in a compression state;

when the grounding disconnecting link (9) is in a closing state, the rotating sheet (77) is positioned at the top of the rear operating shaft (13) and protrudes upwards to be separated from the rear clamping block (20) on the inner side of the rear door (11), the rear door (11) is in an unlocking state, and meanwhile, under the action of the elastic force of the first spring (74), the guide rod (73) slides backwards along the rear operating shaft (13), and the rear end of the guide rod (73) jacks the rear door (11).

3. The mining flameproof high-voltage distribution device front and rear door interlocking mechanism according to claim 2, characterized in that: the sliding block (72) is circumferentially provided with a plurality of ribs (78) extending along the axial direction, grooves (79) in sliding fit with the ribs (78) are formed in the inner side wall of the shaft sleeve (75), when the sliding block (72) is located at the rear limit position, the ribs (78) are in one-to-one corresponding plug fit with the grooves (79), and at the moment, the rear operating shaft (13) cannot rotate relative to the sliding block (72); when the slide block (72) is located at the front limit position, the plurality of ribs (78) are separated from the plurality of grooves (79), and the rear operating shaft (13) can rotate relative to the slide block (72).

4. The mining flameproof high-voltage distribution device front and rear door interlocking mechanism of claim 1, which is characterized in that: the front door interlocking device (5) comprises a support frame (51), a pin hook rod (52), a shifting lever (53) and a second spring (54), the support frame (51) is fixed on a bottom plate (6), the middle part of the pin hook rod (52) is hinged to the support frame (51), a front clamping piece (56) which can be matched and clamped with a front clamping block (21) on the inner side of a front door (2) is arranged at the front end of the pin hook rod (52), a blocking seat (57) is arranged at the rear end of the pin hook rod (52), the second spring (54) is connected between the bottom of the front section of the pin hook rod (52) and the support frame (51), the shifting lever (53) is fixedly sleeved on a part, corresponding to the blocking seat (57), of the front operating shaft (12), and the shifting lever (53) can rotate along with the rotation of the front operating shaft (12);

when the grounding switch (9) is in an open state, the shifting lever (53) presses the stop seat (57) downwards, so that the front clamping piece (56) at the front end of the pin hook rod (52) is turned upwards and clamped with the front clamping block (21) of the front door (2), and the second spring (54) is in a stretching state;

when the grounding knife switch (9) is in a switch-on state, the shifting lever (53) turns upwards to separate from the stop seat (57), and under the action of the elastic force of the second spring (54), the pin hook rod (52) is pulled to turn downwards so that the front clamping piece (56) is separated from the front clamping block (21) of the front door (2).

5. The mining flameproof high-voltage distribution device front and rear door interlocking mechanism according to claim 4, characterized in that: the front door interlocking device (5) further comprises a supporting column (55), wherein the supporting column (55) is located below the rear section of the pin hook rod (52) and used for supporting the rear section of the pin hook rod (52) which turns downwards.

6. The mining flameproof high-voltage distribution device front and rear door interlocking mechanism according to claim 4, characterized in that: the front operating shaft (12) and the rear operating shaft (13) are rotatably supported by bearing blocks (15) fixed on the base plate (6) respectively.

7. The mining flameproof high-voltage distribution device front and rear door interlocking mechanism of claim 1, which is characterized in that: the front end of the front operating shaft (12) extends forwards out of the front door (2) and is provided with a hexagonal block (16).

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