44results about How to "Realize interlocking" patented technology

A mechanical lock device of the opening and closing switch of the high voltage electric major controlling cupboard and an interlocking mechanism of the branch controlling cupboard door belong to the technical field of the safety protection device for high voltage electrical devices. The invention comprises a first mechanical lock device arranged on the major controlling cupboard body, and a control box arranged on the major controlling cupboard body or the branch controlling cupboard, the control box is provided with a first control lock and a second control lock, the first key for the first control lock and the first mechanical lock device is the same, the first key is unique, the second key for the second control lock and the corresponding second mechanical lock device is the same, and the second key is also unique, the control box is provided with a box controlling key device. The invention has the advantages that the opening and closing switch of the major controlling cupboard are reliably locked in the opening or closing state, and that the reliable connection with the branch controlling cupboard door can be realized, and that the invention with simple structure is convenient to assemble and ensures safety without fault.

The invention provides a train cab interlocking and mutual-controlling system based on a train line. The system comprises one train line which penetrates through a train; a cab is internally provided with a key switch, a key relay, a key interlocking relay and an occupation relay, wherein the key switch, a normally-closed contact of the key interlocking relay and the key relay are connected in series and then are switched into a train power grid; the key switch, a normally-opened contact of the occupation relay and the normally-closed contact of the key relay are connected in series and then are connected with the relay in parallel, all of the members are connected with the normally-opened contact of the key relay in series and then are switched into the train power grid; and the train line is connected with a lead wire between the occupation relay and the normally-opened contact of the key relay. The system provided by the invention has an ingenious concept and the interlocking and the mutual-controlling of the cab can be realized by only using one train line, so that the system is beneficial to simplifying design and construction and improving the reliability; according to the system provided by the invention, not only the interlocking and the mutual-controlling of keys of the two cabs in the train are realized, but also the interlocking and the mutual-controlling of the keys of any two cabs can be realized when random arrays of the trains are coupled.

The invention discloses a high voltage switch cabinet misoperation preventing device, comprising an operation hole for switch-on-off coaxial operation of a disconnecting switch and an earthing switch, a movable shading plate for controlling opening and closing of the operation hole, an interlocking mechanism of a vacuum circuit breaker and the disconnecting switch as well as the earthing switch, a cabinet door and disconnecting switch interlocking mechanism and an earthing switch and cabinet door interlocking mechanism. The misoperation preventing device can reliably prevent misoperation of switch-on-off operations of the vacuum circuit breaker, the disconnecting switch and the earthing switch and door opening and closing operations of a high voltage switch cabinet, and can ensure safety and reliability of operations; and the high voltage switch cabinet misoperation preventing device has the advantages of being simple in structure, occupying small space, increasing no volume of the high voltage switch cabinet, being simple and convenient to operate, and so on.

The invention relates to a mechanism for reversing and transferring aluminium ingots discharged from an aluminium slab ingot heating / soaking pit furnace. The mechanism comprises a material-reversing oil cylinder, a material-reversing rack, a rotating shaft, an ingot-conveying trolley, a supporting oil cylinder, a crank and a supporting frame, wherein the material-reversing rack is fixed on the rotating shaft; the two ends of the rotating shaft are arranged on a concrete base through a bearing pedestal; a material-reversing oil cylinder base is arranged on a base under the material-reversing rack; the material-reversing oil cylinder body is hinged with the material-reversing oil cylinder base; a piston rod of the material-reversing oil cylinder is hinged with one end of the material-reversing rack; a supporting oil cylinder base is fixed on the lower side of the other end of the material-reversing rack; the supporting oil cylinder body is hinged with the supporting oil cylinder base; a piston rod of the supporting oil cylinder is hinged with the middle part of the crank; one end of the crank is hinged with the material-reversing rack, while the other end is hinged with a roller; the supporting frame used for supporting the crank roller is fixed on the concrete base; the ingot-conveying trolley, a chain wheel group, a motor and a speed reducer are arranged on the material-reversing rack; and the motor and the speed reducer are in driving connection with the ingot-conveying trolley through the chain wheel group.

The invention relates to the technical field of electric appliance detection and discloses a preheating switching device for fuse breaking capacity test. The preheating switching device is connected to a large-capacity test system for fuse breaking capacity test, appropriate fuse fusing time is set in a monitoring / operation computer, a test sample (fuse) is mounted, data acquisition of low-voltage current is completed through a shunt by an electrical test data acquisition system, data acquisition of high-voltage current is completed through a Rogowski coil and an integrator by the electrical test data acquisition system, interlocking of a high-voltage breaker and an isolation breaker is realized through a programmable controller, and closing operation of the high-voltage breaker can be started after the isolation breaker is opened. By application of the preheating switching device, the fuse breaking capacity test process is controlled within 30-45 seconds, automatic control is realized, switching time interval of the high-voltage breaker and the isolation breaker is small, test success rate is increased, risk that test equipment is burnt down is lowered, and test cost is lowered.

The invention provides a socket, comprising a front cover, a connector socket and a wiring box. Particularly, the front cover is provided with a contact sheet; the connector socket is provided with six insertion pins, wherein four insertion pins are connected with three-phase four-wire alternating current of an externally connected ground power supply in sequence without the need of single match with the ground. The other two insertion pins are used for matching with the contact sheet of the front cover; when the front cover is opened or closed, loops of the two insertion pins are controlled to be disconnected or connected, so the linkage with the high-voltage poser supplying system of a vehicle is realized.

The invention discloses a slow-closing type outdoor alternating-current high-voltage isolating switch with a built-in fracture. The slow-closing type outdoor alternating-current high-voltage isolatingswitch comprises a main loop unit, a main frame piece, an operating unit, an operating handle and an interlocking transmission unit, wherein the main loop unit is connected with a main switch througha connecting bar and used for controlling opening and closing of the isolating switch, the main frame piece is connected with the main loop unit and is used for placing the main switch, the operatingunit is used for driving the main loop unit to act to execute opening and closing of the isolating switch, the operating handle is connected with the operating unit and is used for outputting openingand closing actions, the interlocking transmission unit is connected with the main loop unit through a synchronizing shaft and is used for realizing bidirectional locking of the isolating switch by the main switch, the interlocking transmission unit and the operating unit are coaxially arranged, the interlocking transmission unit is linked with the operating unit to realize opening and closing ofthe isolating switch when the main switch is at the opening position, and the interlocking transmission unit unlocks the main switch and can operate the main switch to realize opening and closing when the isolating switch is at the opening or closing position. According to the invention, the main loop unit, the interlocking transmission unit, the operating unit, the main frame piece and the connecting bar are all used as independent mechanisms for production and are not arranged in sequence, the main loop unit, the interlocking transmission unit, the operating unit, the main frame piece and the connecting bar can be assembled through set positions to form the whole isolating switch, and the production and assembly process is simplified.

The invention discloses a locking device for a rear axle of a bicycle based on an internet of things, which is a locking device for a rear axle of a public bicycle based on mobile phone signal remote control and particularly solves the problems existing in a novel patent 'Locking device for rear axle of bicycle' (201520919152.1) that a lock bolt plate is jammed, a lock bolt is easy to lock by a lock hole so as to cause vehicle locking failure and the like. The locking device comprises a shell, a middle axle, a power generation device, a locking device and a control device, can completely prevent the lock bolt from being jammed and is high in reliability; the power generation device, the locking device and the control device are all encapsulated inside the shell; and the locking device drives the lock bolt to be inserted into or slide out of the lock hole through an electromotor. The locking device disclosed by the invention has the beneficial effects that the structure is simple, and a synchronization device is not required; and through matching of the lock bolt plate and a cylindrical pin on a left half axle, external force can be borne to prevent the electromotor from damage by excessive stress. A parking pile is not required at all, and the bicycle can be borrowed at any moment and returned after being used. In the riding process, the bicycle not only can generate power, but also can be charged for energy storage. A lock and a control module are integrated inside the rear axle, so that the problem that the bicycle is easy to steal is solved, and the service life is prolonged.

The invention discloses a dual-power servo hydraulic jacking device with an interlocking function. Particularly, hydraulic energy of oil drives a lifting rod to be lifted, a gear drives a rack and a movable plate to move to lift the lifting rod synchronously, the hydraulic and mechanical lifting effects are achieved, the load bearing load is large, the worm and gear transmission one-way self-locking function is used for achieving interlocking of the lifting rod, and the problem that an existing hydraulic lifting device is prone to happening falling risks when leakage happens is solved. A drivemechanism includes a hydraulic execution assembly for pumping oil and a mechanical execution assembly for rigid driving, wherein a vertical bracket top end flange is provided with a servo motor electrically connected to a power source and used for controlling a switch, the output end of the servo motor is connected to a worm, and the worm is connected with the hydraulic execution assembly and themechanical execution assembly.

The invention discloses an aluminum bar deep well fusion casting production line system with a safety monitoring function. The system comprises a smelting furnace, a launder and a deep well casting machine, liquid level sensors are arranged at the position of an aluminum outlet of the smelting furnace, the connector position of the aluminum outlet and the launder and the connector position of thelaunder and a die disc, an automatic mechanical locking device is arranged on the aluminum outlet and is used for automatically blocking or opening the aluminum outlet at the different casting stages,a first overflow opening is formed in the connector position of the aluminum outlet and the launder, and communicates with at least one emergency liquid storage pool, a molten aluminum emptying valveis mounted, a dual-filter system and an emergency cutoff valve are arranged on the launder, a water inlet temperature sensor, a water inlet pressure sensor, a water inlet flow sensor and a water returning temperature sensor are arranged between the deep well casting machine and the cooling water system, a monitoring platform is further included, the smelting furnace, the launder and the deep wellcasting machine are interlocked, automatic safe flow control and failure warning can be achieved, the whole process of casting can be intelligently monitored, and safety is high.

The invention aims to solve the problem that low anti-slip efficiency of train sets in each yard of a railway influences the vehicle turnaround effectiveness and causes potential safety hazard problems; and discloses technical equipment for controlling an iron shoe robot supporting system to complete automatic anti-slip implementation of an iron shoe robot through an artificial intelligence technology. According to the working principle of the iron shoe robot supporting system, electric energy is mainly provided by the iron shoe walking vehicle control module, and coordinated control is conducted on actions of an iron shoe walking vehicle lifter, an iron shoe walking vehicle, an iron shoe horizontal pushing frame and an iron shoe walking lock; the iron shoe walking vehicle lifter can automatically move to the ground from the iron shoe box under the foundation through the iron shoe walking vehicle lifter, interlocking and separation of the iron shoe walking vehicle lifter and an iron shoe walking vehicle are achieved through the iron shoe walking lock, the iron shoe robot on an iron shoe loader is conveyed to a steel rail through an iron shoe horizontal pushing frame, and finally the iron shoe walking vehicle returns to the iron shoe box along the original path.

The invention relates to the field of switchgears, and in particular relates to a cabinet door interlocking device for a switch cabinet. The cabinet door interlocking device for the switch cabinet comprises a cabinet door lock, a grounding interlocking member and a mechanism interlocking plate. The cabinet door lock comprises a lock seat and a lock tongue hinged on the lock seat. The upper end ofthe lock tongue comprises a grounding switch limiting portion and a switch mechanism limiting portion. The lower end of the lock tongue comprises a hook for locking the switch cabinet door, and the middle portion of the lock tongue comprises an operating handle. The grounding interlocking member comprises a grounding interlocking plate which comprises an upper arm and a lower arm. The upper arm ofthe grounding interlocking plate is connected with the grounding switch drive shaft of a grounding switch. The lower arm of the grounding interlocking plate cooperates with the grounding switch limiting portion of the lock tongue. The middle portion of the grounding interlocking plate is hinged to the mechanism front plate of the grounding switch. The mechanism interlocking plate is connected with the switch mechanism drive shaft of a switch mechanism. The mechanism interlocking plate comprises a blocking piece which cooperates with the switch mechanism limiting portion of the lock tongue. The interlocking of the grounding switch, the switch mechanism and the switch cabinet door can be realized.

The invention provides a movable transition track bridge for a heating furnace, which comprises a track, a connecting rod, a crank and a cylinder, wherein a fixed end of the track is hinged with a track outside the furnace, a movable end of the track is hinged with one end of the connecting rod, the other end of the connecting rod is hinged with a movable end of the crank, a fixed end of the crank is hinged with a support, and the track, the connecting rod and the crank form a crank and rocker mechanism; and the cylinder is arranged on a foundation outside the furnace, a piston rod of the cylinder is hinged with the crank, the cylinder provides a power source for the crank and rocker mechanism, the piston rod of the cylinder drives the crank to rotate, and the track rotates along a path of a one fourth circle under the staged driving of the crank and the connecting rod to ensure the conversion of the track from a vertical state to a horizontal state. The movable transition track bridge satisfactorily ensures the integrity and good sealing of a furnace door structure, reduces the fault rate of a furnace door of the heating furnace, and realizes the interlocking and automatic control of various positions of equipment.

The invention provides an interlocking mechanism which is applied in the technical field of high-voltage switch equipment. A grounding switch (3) is arranged in a switch cabinet, the interlocking mechanism comprises a ground rod (4), one end of the ground rod (4) is connected with the grounding switch (3), the other end of the ground rod (4) is movably connected with a connecting rod (5), the other end of the connecting rod (5) is movably connected with a side plate (1) of the switch cabinet, an interlocking piece (6) is arranged on a rear sealing plate (2) of the switch cabinet, a groove (7) is formed in the interlocking piece (6), and one end, connected with the side plate (1) of the switch cabinet, of the connecting rod (5) is provided with a movable piece (8). According to the interlocking mechanism, the structure is simple, when the grounding switch is switched on, the interlocking for the rear sealing plate of the switch cabinet can be achieved, the rear sealing plate of the switch cabinet is prevented from being opened, and when the grounding switch is switched off, the interlocking for the rear sealing plate of the switch cabinet can be released, so that when operating personnel conduct detection operation to the switch cabinet, the operation can be conducted under a safe environment.

The invention declares a mechanical press with a self-lock worm mechanism, which controls the horizontal movement of a piston and friction plates through the on / off of a two-position three-way electromagnetic directional valve on an air passage, in combination with the elastic force of the springs. According to the invention, the friction plates are in a braking state when being jointed and the self-locking of the worm is realized, so as to ensure safety operation and stamping precision of the mechanical press; when the friction plates are released, the worm can rotate; an upper die adjusting system of the mechanical press can operate; and a braking body can be under remote monitoring of a pressure relay, and interlocking together with other actions in the press is realized. The mechanical press has the benefits that the structure is compact; the driving motor of the piston dispenses with a braking motor, which saves the installation space; and the situation that the press has a smaller slide block is more practical. Meanwhile, the mechanical press can be widely used in equipment with self-locking requirements; the intensity of the spring braking force can be adjusted through horizontal adjusting of the adjusting nuts, so as to ensure the braking effect.

The invention discloses a three-station operating mechanism which comprises a base, a panel, an isolation operating shaft, a grounding operating shaft, a linkage assembly and an operating handle. An isolation shaft sleeve is concentrically fixed at the front end of the isolation operation shaft, a grounding shaft sleeve is concentrically fixed at the front end of the grounding operation shaft, an isolation operation hole aligned at the isolation shaft sleeve and a grounding operation hole aligned at the grounding shaft sleeve are formed in the panel, and an isolation opening is formed in the isolation shaft sleeve. The grounding shaft sleeve is provided with a grounding opening, and the operating handle is provided with a protruding block. An isolation opening gap and an isolation closing gap are further formed in the peripheral side of the isolation operation hole, a grounding opening gap and a grounding closing gap are further formed in the peripheral side of the grounding operation hole, and a limiting block is further arranged on the protruding block in a protruding manner. The three-station operating mechanism has the advantages of simple structure, compact arrangement, reliable interlocking, safety and stability.

The invention relates to a switch cabinet drawer interlocking mechanism and provides the following technical scheme that the switch cabinet drawer interlocking mechanism comprises a revolving shaft, a handle and two locking strips, wherein the spindle is pivoted on a drawer body, the handle is arranged on the revolving shaft, and two locking strips with sawtooth are pivoted on the drawer body andare in linkage with the revolving shaft to form relative axial movement; the revolving shaft and the two locking strips are in linkage by the interlocking mechanism; the interlocking mechanism comprises a driving block, a locating part and a swing arm, wherein the driving block is connected with the revolving shaft, the locating part forms multistation locating of the driving block, and the swingarm is connected with and in swing cooperation with the driving block and is connected with either of the blocking strips. The invention provides the switch cabinet drawer interlocking mechanism withsimple structure and low cost by the above technical scheme.

The invention discloses a wind-driven controller of a fender of an interlock way. The other end of a fender manual reversing valve is connected with the other end a rail manual reversing valve, the next end of a manual reversing valve and a fender cylinder back wind opening, another end of the fender manual reversing valve is connected with an operating handle of a pressure valve, one end of the rail manual reversing valve, another end of the manual reversing valve and the fender cylinder front wind opening, one end of the pressure valve is connected with the other end of a fender air cylinder, the other end of the pressure valve is connected with the other end of the fender air cylinder and the other end of a rail air cylinder, another end of the fender air cylinder is connected with the other end of the rail air cylinder, a fourth end of the fender air cylinder is connected with the other end of the rail manual reversing valve, another end of the rail air cylinder is connected with another end of a manual reversing valve, one end of the manual reversing valve is connected with a rail cylinder back wind opening, and the other end of the manual reversing valve is connected with a rail cylinder front wind opening. The wind-driven controller disclosed by the invention is applied to preventing a mine car from unhooking, enlargement sliding or excessively trailing trolleys during conveyance of a coal mine inclined drift, utilizes an underground wind source, and has the advantages of simple structure, no power supply, safety and reliability.

The invention discloses an interlocking device for an earthing switch and a door of a switch cabinet. The interlocking device is characterized by comprising an earthing switch operating shaft, a lock catch mechanism and a transmission mechanism, wherein the earthing switch operating shaft is connected with the earthing switch and rotationally arranged on a base plate and moves between a power-on position and a power-off position; the lock catch mechanism is provided with a rod bolt arranged between a door leaf and a door frame of the door and a latch hole plate matched with the rod bolt; the transmission mechanism enables the earthing switch operating shaft and the rod bolt to be in transmission connection, at the power-on position, the rod bolt and the corresponding latch hole plate are locked, and at the power-off position, the rod bolt and the corresponding latch hole plate are unlocked. Through the interlocking structure, interlocking of a circuit breaker room door and a cable room door can be realized at the same time.

The invention provides a roasting furnace device. The roasting furnace device comprises a flue, a steam generator, a steam-water separator, smoke exhaust cylinders, a control box and variable-frequency fans. The flue communicates with a kiln through a smoke inlet. The steam generator is installed inside the kiln in an integrated mode and communicates with the steam-water separator. The steam-water separator is arranged outside the flue. The smoke exhaust cylinders are arranged at the two ends of the flue. The control box is electrically connected with the steam-water separator and the smoke exhaust cylinders. The variable-frequency fans are arranged on the smoke exhaust cylinders. According to the roasting furnace device, due to the arrangement of the steam generator and the steam-water separator, heat in flue gas inside the kiln is fully used, heat loss of exhausted smoke is reduced, the temperature of the exhausted smoke is decreased, pollution is reduced, and meanwhile cycle use can be achieved; and due to the arrangement of the control box as well as temperature, pressure and flow instruments, the intelligent control degree is improved, automatic water supplement is achieved, the flue gas temperature curve and the water line are monitored, water level alarm and interlocking are achieved, and use is more convenient.

The invention provides a safety device for a stop valve of a turbine pump. The safety device comprises a travel switch, a contact block and a stop valve driving device, wherein the travel switch is interlocked with a control circuit of the turbine pump; only when the travel switch is turned on, can the control circuit make a motor drive the turbine pump to rotate; the contact block is arranged at the top end of a valve rod of the stop valve, a contact of the tail end of the travel switch is matched with the contact block, and when the contact of the tail end of the travel switch is in contact with the contact block, the travel switch is turned on; the stop valve driving device is connected with the contact block and drives the contact block to move upwards or downward, and the contact block is made to make contact with or be separated from the contact of the tail end of the travel switch. By introducing the travel switch interlocked with the control circuit of the turbine pump, the effect that the turbine pump can start operating and supply oil only when the stop valve is opened is guaranteed, and idling of the turbine pump is effectively prevented.

The invention belongs to a power cutting device of a down-hole trackless rubber-tyred mine car, particularly relates to a hydraulic control power cutting device of a down-hole trackless rubber-tyred car, and solves the abrasion problem of a brake, a friction plate, a transmission shaft and the like in the travelling brake process of the current down-hole trackless rubber-tyred car. The hydraulic control power cutting device is composed of a valve body I, a valve body II, a valve body III, a directional operating valve, a shift operating valve and a power cutoff valve assembly, wherein the power cutoff valve assembly comprises a pressure adjusting part arranged in the cavity of the valve body VI, power cutoff parts arranged in the cavities of the valve body I and the valve body II, and a reset part. The hydraulic control power cutting device of the down-hole trackless rubber-tyred car in the invention has the beneficial effects that: 1, during travelling brake, components such as a travelling brake, a gearbox friction plate, a transmission shaft and the like can be effectively protected; 2, interlocking of the travelling brake and a gearbox clutch on operation can be realized; 3, output of a pressure with a constant valve from a right end of a hydraulic piston can be realized; and 4, the power cutting device has a more reasonable structure and better generality.

The invention discloses an interlocking structure and an interlocking method based on air pressure control. The interlocking structure comprises a base, an inner mover and a friction block. A motion guide table is arranged on the base, an outer mover is arranged outside the motion guide table in a coordinating mode, the inner mover is inserted in the motion guide table, a workbench is fixedly connected above the outer mover, and the friction block is fixedly arranged on the inner mover; an air floating surface is arranged between the top surface of the motion guide table and the inner mover, the air floating surface is communicated with a positive pressure air supply passage, a vacuum chamber is correspondingly arranged at the position of the air floating surface, and the vacuum chamber iscommunicated with a negative pressure air supply passage. The opening and closing of the positive pressure and the negative pressure realize transformation of contact and non-contact states of two moving parts, thereby realizing the interlocking and unlocking between the moving parts. The structure does not have an added external actuator, completely utilizes an air-floating support form of the inner mover, only increases the negative pressure adjustment, and does not change the original structure. The interlocking structure provides a good basic condition for high-precision motion positioning and has high practical value.

The invention relates to the technical field of electrical equipment, in particular to a double-hole operation three-in-two interlocking mechanism and a ring main unit. The mechanism comprises a panel which is provided with a slide way and an operation hole, a key, a transmission mechanism, a first sliding mechanism, a second sliding mechanism, and an automatic reset device. When the device is in a switching-on state, the key cannot be pulled out from the panel, only when the device is in a switching-off state, the key can be pulled out, and the second sliding plate blocks the operation hole. And interlocking of the double-hole operation mechanism is perfectly realized.

The present invention relates to containers and in particular to containers. A disadvantage of conventional containers (containers) is that up to now the interlocking of stacked containers had to be carried out manually and therefore posed a high risk of injury to workers in ports and on board ships. It also depends on the skill of the crane driver to accurately stack containers (C1, C2, C3, C4) side by side and on top of each other. There is no adjustment device for this purpose. An object of the present invention is to provide a container (container) that is equipped to be horizontally interlocked with other containers of the same type without manual operation and at the same time to be able to accurately position the container at a predetermined position. According to the invention, this object is achieved in that the containers have on their exterior, for example, devices in the form of U-shaped guide slats, which are inserted into similar devices of the adjacent container, precisely positioning the container and each container (C1, C2, C3, C4) are horizontally interlocked with each other.

The invention provides a train cab interlocking and mutual-controlling system based on a train line. The system comprises one train line which penetrates through a train; a cab is internally provided with a key switch, a key relay, a key interlocking relay and an occupation relay, wherein the key switch, a normally-closed contact of the key interlocking relay and the key relay are connected in series and then are switched into a train power grid; the key switch, a normally-opened contact of the occupation relay and the normally-closed contact of the key relay are connected in series and then are connected with the relay in parallel, all of the members are connected with the normally-opened contact of the key relay in series and then are switched into the train power grid; and the train line is connected with a lead wire between the occupation relay and the normally-opened contact of the key relay. The system provided by the invention has an ingenious concept and the interlocking and the mutual-controlling of the cab can be realized by only using one train line, so that the system is beneficial to simplifying design and construction and improving the reliability; according to the system provided by the invention, not only the interlocking and the mutual-controlling of keys of the two cabs in the train are realized, but also the interlocking and the mutual-controlling of the keys of any two cabs can be realized when random arrays of the trains are coupled.

The invention discloses an interlocking device for an earthing switch and a door of a switch cabinet. The interlocking device is characterized by comprising an earthing switch operating shaft, a lock catch mechanism and a transmission mechanism, wherein the earthing switch operating shaft is connected with the earthing switch and rotationally arranged on a base plate and moves between a power-on position and a power-off position; the lock catch mechanism is provided with a rod bolt arranged between a door leaf and a door frame of the door and a latch hole plate matched with the rod bolt; the transmission mechanism enables the earthing switch operating shaft and the rod bolt to be in transmission connection, at the power-on position, the rod bolt and the corresponding latch hole plate are locked, and at the power-off position, the rod bolt and the corresponding latch hole plate are unlocked. Through the interlocking structure, interlocking of a circuit breaker room door and a cable room door can be realized at the same time.