85results about How to "Reliable contact" patented technology

The plug comprises a plug shell and a tail sleeve, the plug shell is formed by assembling an outer shell and a mounting seat, an inner core is arranged in the plug shell and is positioned with the mounting seat, the mounting seat is divided into a front section and a rear section, the front section is of a cylinder structure connected with the outer shell in a matched mode, and the rear section is of an external thread connecting section connected with the tail sleeve in a matched mode. The shell is sleeved outside the cylindrical structure of the mounting base in a manner of being capable of rotating for a certain distance through a limiting structure and can rotate for a certain distance relative to the inner core, and a locking piece capable of being matched and locked with a corresponding socket or plug is mounted on the shell in a front-back sliding manner. The plug is reasonable in structural design, plugging adopts a direct plugging and rotary locking mode, plugging and unplugging are convenient, locking is firm and stable, misoperation unlocking can be prevented, abrasion to the inner core can be reduced, the service life of the plug is prolonged, the waterproof performance is good, and processing and manufacturing are convenient.

The utility model relates to a double-break circuit breaker switch, which comprises a mechanism frame, a circuit breaker assembly and an isolating switch assembly, and the circuit breaker assembly comprises a solid-sealed polar pole, three fixing seats, a main shaft and three groups of transmission cam assemblies. The isolation switch assembly comprises three first static contacts, an insulation isolation shaft which is rotatably arranged on the mechanism frame, three insulation cams which are respectively arranged on the insulation isolation shaft, three isolation knives which are respectively arranged on the three insulation cams, three second static contacts which are arranged on a fixed beam of the mechanism frame, and a grounding contact assembly which is arranged on the mechanism frame. The two ends of the static contact are respectively provided with a first contact part and a second contact part which are matched with the isolation knife, and a limiting check ring which is matched with the isolation knife is arranged at the position, corresponding to the position between the first contact part and the second contact part, of the static contact. The vacuum circuit breaker has the advantages of simple structure, stable and reliable performance, good insulating property, high opening and closing speed and small volume.

The utility model discloses a miniaturized high moment has brush motor, this motor aims at solving the inductance element and carbon brush assembly and terminal of existing motor inside adopt direct welding mode, cannot keep reliable contact in the problem of vibration environment. The motor includes the shell, the stator subassembly of fixed mounting in the shell inside, the rotor subassembly of rotation installation in the shell inside and with the terminal subassembly of rotor subassembly electricity is connected, and the terminal subassembly includes the middle plate, installs the inductance in the middle plate, carbon brush assembly and conducting terminal, and one end of inductance is fixed after welding with the conducting terminal riveting, and the other end of inductance is fixed after welding with carbon brush assembly riveting. The utility model passes through independent riveting welding inductance both ends, realizes inductance and brush arm, inductance and the high strength mechanical locking and conducting connection of conducting terminal, and the anti -vibration performance is superior to direct welding mode, can keep reliable contact in the vibration environment.

The invention relates to the technical field of measurement, in particular to a wheel type distance measuring device for road and bridge segmented construction and a distance measuring method thereof.The wheel type distance measuring device comprises a wheel, a handle and a counter, the counter is fixed to the handle, and the wheel is connected with the handle through an elastic assembly; the elastic assembly can adaptively adjust the distance between the wheel and the counter under the condition of an uneven road surface, the wheel and the counter are matched through the transmission assembly, and the transmission assembly can drive the counter to operate in the process that the wheel rotates and the elastic assembly stretches out and draws back; the brush is matched with the cleaning assembly, when the wheel rotates, the cleaning assembly drives the brush to brush the outer wall of the wheel in a reciprocating mode, the device is compact in overall structure and convenient and fast to operate, and the elastic buffering function, the stable transmission function and the automatic cleaning function are organically integrated; and the environmental adaptability and the working reliability of the wheel type distance measuring device in a road and bridge segmented construction scene are improved.

The application provides a wire SI performance test board for rapid docking, comprising a test mainboard, a plurality of test output interfaces are arranged on the front surface of the test mainboard, a first SMA interface is arranged on the upper side of the test output interface, a second SMA interface is arranged on the left side of the test output interface, a test input interface is arranged on the back surface of the test mainboard, the test input interface is provided with a first magnetic attraction assembly, the test mainboard further comprises a test input connector, the test input connector is provided with a second magnetic attraction assembly, one end of the test input connector is rapidly docked with the test input interface through the second magnetic attraction assembly and the first magnetic attraction assembly, and the other end of the test input connector is provided with a wire docking interface. The application can significantly improve the wire connection / detaching efficiency, is simple and reliable to operate, reduces interface abrasion, and has good adaptability.

The present application relates to the technical field of connector, especially to an electric connector assembly. The electric connector assembly comprises a shell, a PCB adapter plate is arranged in the shell, two or more rows of non-ground cables are electrically and fixedly connected to the PCB adapter plate, two or more rows of connecting pads are arranged on the front and back surfaces of the PCB adapter plate respectively, each row of connecting pads comprises a row of signal pads and ground pads, the core wire of the non-ground cable is electrically and fixedly connected to the signal pad on the front surface, the conductive outer sheath is electrically connected to the ground pad on the front surface, the signal pad and the ground pad on the back surface are used for being electrically connected to the corresponding terminals of a PCB female plate or being electrically connected to the corresponding terminals of an adapter socket and then being electrically connected to the PCB female plate, the PCB adapter plate is internally arranged with a conductive circuit to correspondingly connect the connecting pads on the front and back surfaces of the PCB adapter plate, and the electric connector assembly further comprises a load bottom support which is locked and connected to the shell. The electric connector assembly can realize multi-row high-density wiring and greatly improve the performance of the connector.

The utility model belongs to the field of circuit breakers, and particularly relates to an isolation circuit breaker which comprises a mechanism frame, a circuit breaker unit and an isolation switch unit, the isolation switch unit comprises an isolation shaft, an isolation knife and a static contact, the isolation knife is in linkage fit with the isolation shaft, the isolation knife acts along with the isolation shaft, and connection or disconnection of the isolation knife and the static contact is achieved. Two cooling fins are arranged at the positions, corresponding to the two sides of the isolation knife, of the static contact, one end of each cooling fin is provided with a contact part extending in the direction of the isolation knife, and when the isolation knife is connected with the static contact, the contact parts of the two cooling fins are attached to the two sides of the isolation knife respectively; the two cooling fins are additionally arranged on the static contact, when the isolation knife is connected with the static contact, the contact portions of the two cooling fins are attached to the two sides of the isolation knife, the cooling fins can conduct heat of the isolation knife, heat dissipation of the isolation knife is facilitated, and therefore temperature rise can be reduced.

The present invention relates to an expansion joint suitable for a low-headroom lightweight busbar, comprising: a first and a second expansion joint arranged in parallel; a first flow taker, one end of which is fixedly connected to the first expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; a second flow taker, one end of which is fixedly connected to the second expansion joint, and a lower pressure plate is fixedly arranged at the bottom of the other end; the lower pressure plate has a horizontal section arranged horizontally, a groove is provided in the horizontal section, and a pressure block is installed in the horizontal section, the top of which is against the second expansion joint or the bottom of the first expansion joint; the pressure block cooperates with the bottom of the flow taker to clamp the second expansion joint or the first expansion joint, and the first flow taker is slidably connected to the second expansion joint or the second flow taker is slidably connected to the first expansion joint; the first expansion joint can slide relative to the second expansion joint to ensure the stable operation of the locomotive and improve the safety and reliability of the locomotive operation.

The embodiment of the present invention discloses a novel gearbox switch, including a metal push rod with a convex edge at one end inserted into the metal shell from the through hole of the metal shell, a guide sleeve and a first sealing ring are sequentially sleeved on the metal push rod between the convex edge and the through hole, an insert sub-component is fixedly mounted in the metal shell, and symmetrically arranged static contact pieces are installed on both sides of the insert sub-component, a slider is installed in an opening at one end of the insert sub-component, one end of the slider is set against the convex edge, and a dynamic contact piece is sleeved on the convex column on the other side of the slider, one end of the spring is sleeved on the convex column, and the other end of the spring is sleeved on the top column of the socket splitter, the top column is located at the center of one end of the socket splitter away from the socket head plug-in, the socket splitter is snap-connected with the metal shell, and the insert sub-component is set against the socket splitter. The novel gearbox switch can realize dynamic sealing, and is provided with a sliding plate structure with a self-cleaning function, the switch is reliable in conduction contact, and the switch can be realized as normally open or normally closed without changing the appearance.

This utility model discloses an improved irregular-shaped test socket, including an irregular-shaped pin plate. The pin plate has multiple sets of mounting holes, each set including multiple parallel pin slots, with the pin tip slot higher than the pin tail slot. A circular limiting groove penetrating multiple pin slots is provided in the center of each mounting hole, located above a hollowed-out portion. A silicone circular rod is installed within the circular limiting groove. The arc-shaped portion of the irregular-shaped pin is installed below the silicone circular rod, with the pin tip located in the pin tip slot and the pin tail slot within the pin tail slot. A silicone strip groove is provided above the circular limiting groove and the pin tail slot, containing a silicone strip used to press against the silicone circular rod and pin tip. The silicone strip is made of a softer material than the silicone circular rod. This utility model increases the rigidity of the rotating shaft, stabilizing the rotation of the irregular-shaped pin, preventing sliding friction, improving the lifespan of the circuit board, increasing the interference contact amount, and ensuring reliable contact.

The utility model relates to the technical field of precision optical devices, and discloses a piezoelectric optical adjusting frame which comprises a fixed frame, a movable frame, an elastic connecting assembly and two piezoelectric drivers. A base is arranged in a shell of the piezoelectric actuator. And piezoelectric ceramics are arranged on the base. And a first gasket is arranged on the piezoelectric ceramic. A first ball abuts against the upper portion of the first gasket. A flexible hinge abuts against the upper portion of the first ball. And a push rod is arranged above the flexible hinge. A second ball abuts against the upper portion of the push rod. The second ball abuts against the movable frame. The shell penetrates through the fixing frame and is fixed to the fixing frame. The second ball pushes the movable frame to be close to or away from the fixed frame under the action of the piezoelectric ceramics. The two piezoelectric actuators are adopted to push the moving frame to achieve two-dimensional large-angle high-precision deflection of theta X and theta Y, the overall structure is simple and compact, and operation is reliable. The piezoelectric actuator is linearly driven by piezoelectric ceramics, and has the characteristics of large output, large load, high response speed and high resolution.

A busbar electric connecting wire clamp comprises a wire clamp body and clamping plates, the clamping plates are fixedly connected to the lower portions of the two sides of the wire clamp body through first bolt pairs, a groove is formed in the lower end face of the wire clamp body in the line direction, an elastic contact piece is fixed in the groove, and the lower end face of the elastic contact piece protrudes out of the groove; the wire clamp body is arranged above the busbar, the wire clamp body is clamped and fixed on the top of the busbar through the clamping plate, and the lower end face of the elastic contact piece abuts against the top of the busbar.

The invention relates to the technical field of photovoltaic supports, in particular to a sloping roof photovoltaic support and a construction method thereof, and the photovoltaic support comprises a plurality of back pull assemblies, a plurality of ground beam assemblies and a plurality of photovoltaic mounting base assemblies. The back pull assembly comprises a rear wall inclined strut, a rear wall transverse strut and a back pull, one end of the rear wall inclined strut is arranged on the rear wall of the house, the other end of the rear wall inclined strut is arranged on the back pull, one end of the rear wall transverse strut is arranged on the rear wall of the house, and the other end of the rear wall transverse strut is arranged on the back pull; the ground beam assembly comprises a front wall inclined strut, a front wall transverse strut and a ground beam, one end of the front wall inclined strut is arranged on the front wall of the house, the other end of the front wall inclined strut is arranged on the ground beam, and one end of the front wall transverse strut is arranged on the front wall of the house. After being installed, the support is not connected with the roof, and an original waterproof layer or waterproof tiles of the roof are prevented from being damaged; by arranging the positioning assembly, positioning installation of the back pull and the ground beam is conveniently achieved, and the construction efficiency is improved.

The utility model discloses a sliding plate support base wheel set which comprises a base and a support, the base and the support are respectively provided with a containing cavity, a spring is arranged between the containing cavity of the base and the containing cavity of the support, a taper groove A assembled with the spring is formed in the containing cavity of the base, a taper groove B assembled with the spring is formed in the containing cavity of the support, and a taper tangent plane A is arranged at the end, making contact with the taper groove A, of the spring. The end, making contact with the taper groove B, of the spring is provided with a taper tangent plane B. The spring is tightly assembled in the taper groove A of the base through the taper tangent plane A. The spring is tightly assembled in the taper groove B of the support through the taper tangent plane B. Through the design, the spring is tightly connected with the base and the support, when the spring is used for a long time, the taper grooves of the support and the base become wider under friction and extrusion of the spring, connection between the spring and the taper grooves is more compact under the axial pressure of the spring, the action is more accurate in the using process, operation is quiet, and the service life of the spring is prolonged. The sliding plate support base wheel set is particularly suitable for sliding plates, land impact plates, sliding plate frames and other related products.

This invention relates to a residual current module for a miniature residual current circuit breaker, comprising a handle, a latch, a trip latch, a torsion spring, a contact frame rotatably disposed within a housing, a spring disposed between the contact frame and the housing, a neutral (N) linear contact that is linked to the contact frame, and a residual current tripping assembly disposed within the housing and cooperating with the trip latch. The handle is connected to the latch via a connecting rod, and one end of the latch is connected to the contact frame via a U-shaped connecting rod. The residual current tripping assembly includes an electromagnetic trip unit, a linkage rod slidably disposed within the housing and linked to the electromagnetic trip unit, and a push rod rotatably disposed within the housing and linked to the linkage rod. The push rod has a driving plane that abuts against one end of the trip latch. The driving plane moves with the push rod, causing the trip latch to move and unlocking the latch and the latch. This invention has the advantages of simple structure, stable and reliable performance, fast opening and closing speed, flexible operation, and sensitive tripping action.

The invention relates to a frame interface for an electric bicycle, comprising a frame element with a first fastening region and a second fastening region, and comprising a fastening element, wherein the first fastening region is provided for the bearing-like fastening of a drive unit on the frame element, wherein the fastening element is fastenable on the second fastening region, wherein the second fastening region has a first clamping surface and the fastening element has a second clamping surface, which are provided for jointly encircling at least one partial region of the drive unit in a ring shape, in order to fasten the drive unit on the second fastening region by means of a clamping force.

This invention discloses a transformer testing device, whose switching mechanism includes: three busbar assemblies for electrical connection to the three-phase bushing terminals of the transformer; two sliding contact assemblies, each comprising multiple slidingly engaged slider contacts spaced apart, with each busbar assembly connected and disconnected via the sliding contact assemblies; and a pushing device for driving the slider contacts of the sliding contact assemblies to move, thereby electrically connecting or disconnecting the slider contacts. Operators can quickly connect and disconnect the transformer terminals by controlling the pushing device. The device is simple in structure and easy to operate. Furthermore, when the switching mechanism is in the closed state, the contact is achieved through the contact of the slider contacts. Compared to a disconnector, the contact between the slider contacts is surface contact, which is more reliable, has a larger contact area, and eliminates the shearing force experienced during disconnection and opening of a disconnector, thus solving the problem of contact surface wear.

The utility model provides a kind of rotating equipment turning gear, it is related to turning tool technical field, including handle, fixed jaw piece and movable jaw piece, the fixed jaw piece is connected in the upper end of handle, the movable jaw piece is hinged in the rear side of fixed jaw piece, and worm wheel is connected on the hinged shaft of movable jaw piece, first shaft seat is equipped on the fixed jaw piece in the position below worm wheel, and the inside of first shaft seat is rotatably equipped with the worm that is compatible with worm wheel;The lower end of handle is equipped with rotating unit, and rotating unit is linked with worm and rotates;The utility model uses the clamping mode of fixed jaw piece cooperation movable jaw piece, the bolt of one coupling on the lock nut bolt on movable jaw piece is clamped, the end of fixed jaw piece is inserted into the bolt of another angle on coupling in clamping groove, and turning handle can be carried out turning, because it is supported by coupling bolt, it will not harm the body of coupling, and two fulcrum contact is more reliable, it is not easy to loosen when operating, more safe.

The invention discloses a superconducting wire axial strain critical performance testing device, and relates to the technical field of superconducting wire testing. The device specifically comprises a mounting disc, an outer sleeve, an inner sleeve and a measuring module, wherein the outer sleeve is fixed on one side of the mounting disc; the inner sleeve is arranged in the outer sleeve and is rotationally connected to the mounting disc; the measuring module is arranged at one end, far away from the mounting disc, of the inner sleeve and comprises a cylindrical rotating disc fixedly connected with the inner sleeve, a rod-shaped fixed disc rotationally connected with the cylindrical rotating disc and a C-shaped spring, and the C-shaped spring is fixed on the same side of the cylindrical rotating disc and the rod-shaped fixed disc; a superconducting wire can be arranged on the peripheral wall of the C-shaped spring. Through left-right rotation of the cylindrical rotating disc, the C-shaped spring notch is opened or closed, so that the sample surface generates tensile or compressive strain, the effective test area during sample test is improved, meanwhile, the data uniformity of the superconducting wire in the test process is ensured, and positive and negative axial strain is effectively applied to the superconducting wire sample.

The utility model relates to the technical field of tungsten rod production, and particularly discloses a tungsten rod grinding device which comprises a base, and a linear guide rail is installed on the surface of the base. According to the linear guide rail, a lead screw is rotationally installed in the linear guide rail, limiting rods are symmetrically installed in the linear guide rail, connecting blocks are installed on the surfaces of the limiting rods and the lead screw in a sleeving mode, a handle is installed on the surface of the linear guide rail, a first connecting piece is connected to the surface of each connecting block, and the linear guide rail is installed at the top of the first connecting piece. According to the tungsten rod grinding device, the linear guide rail and the first connecting piece are arranged, the connecting block can be driven to move by rotating the handle through cooperation of the lead screw, the connecting block and the linear guide rail, compared with linear cutting, the position of a tungsten rod can be adjusted more quickly, continuous grinding machining is achieved, and the production angle and flatness of the tungsten rod are guaranteed; therefore, reliable contact between the tungsten rod and the workpiece during welding can be guaranteed, arc discharge is avoided, and machining time is greatly shortened.

The invention discloses a medical knowledge explicit attribution system based on medical literature information, belongs to the field of natural language processing in artificial intelligence in the field of computers, and relates to the medical knowledge explicit attribution system based on the medical literature information. The objective of the invention is to solve the problem of lack of reliability verification of medical knowledge in practical application caused by information uncertainty in medical attribution and diagnosis due to diversity and complexity of existing medical information and knowledge. The system comprises a query text module, a query vector module, a document vector module, a semantic similarity module, a document collection screening module, a basic principle acquisition module, a to-be-verified medical knowledge judgment module and a result output module. The basic principle acquisition module is used for acquiring a basic principle; the to-be-verified medical knowledge judgment module is used for judging whether to-be-verified medical knowledge is true or false; and the result output module is used for outputting a result of the to-be-verified medical knowledge judgment module and a result of the basic principle acquisition module.

This utility model relates to the field of FPC connector technology, specifically to a connection structure for connecting FPC connectors. It includes a connection end, with an FPC flexible plate connected to its right side. A mating mechanism connects the connection end and the FPC flexible plate, extending into the interior of the connection end. A protective mechanism is slidably connected to the outer wall of the connection end, also extending into the interior of the FPC flexible plate. This utility model achieves the connection and fixation between the connection end and the FPC flexible plate through the mutual cooperation of the internal parts of the mating mechanism. It also facilitates the compression of the contact between the female and female pins, making the contact more reliable. Furthermore, the mutual cooperation of the internal parts of the protective mechanism provides dust protection to the top of the connection point between the connection end and the FPC flexible plate, further enhancing the connection's strength.

This utility model discloses a Hall sensor magnetic shaft switch, including a base, a housing connected to the top of the base, a switch moving piece structure slidably connected to the housing, a Hall element disposed on the base, a stationary piece structure fixedly connected to the top of the Hall element, and a wiring plug fixedly connected to the bottom of the Hall element. The stationary piece structure includes a stationary piece frame, two stationary elastic pieces integrally mounted on the stationary piece frame, and a spring installed between the stationary elastic pieces and the stationary piece frame. The bottom of the base has a receiving cavity, and the Hall element is fixedly disposed in the receiving cavity. This relates to the field of Hall sensor switch technology. By setting a stationary piece structure and setting a spring between the stationary piece frame and the stationary elastic pieces, even if the elasticity of the stationary elastic pieces weakens, the spring force can generate an elastic force on the stationary elastic pieces to compensate for the weakened elasticity, ensuring a firm and reliable contact between the stationary elastic pieces and the wiring post, thus ensuring the stability of the wiring.

The utility model discloses an oil level sensor of an oil tank, which comprises a fixing frame and resistor disc supports, the resistor disc supports are buckled with the fixing frame, the oil level sensor further comprises a floater, a floater rod, a sliding sheet and resistor discs, the floater is connected to one end of the floater rod, a floater support is arranged between the resistor disc supports, a rotatable rotating seat is arranged on the floater support, and the rotating seat is connected with the floater rod. One end of the floater rod is fixed on the rotating seat, the sliding sheet is fixed on the rotating seat, the other end of the floater rod is connected on the rotating seat, the resistor disc and the sliding sheet are respectively and conductively connected on the circuit board, the torsion spring is conductively connected with the circuit board, the middle of the torsion spring is sleeved on a rotating shaft of the rotating seat, and one supporting leg of the torsion spring is soldered on the fixing frame. The other supporting foot of the torsion spring is soldered on the sliding piece, the protruding point on the sliding piece is in contact with the resistor disc, and the end of one supporting foot of the torsion spring extends to the protruding point to be in contact with the resistor disc. The torsion spring can replace a slip sheet to be in conductive contact with the resistance sheet, the breakpoint generation risk is reduced, the slip sheet and the resistance sheet are in conductive contact more reliably, and the reliability of the structure is improved.

This utility model belongs to the field of micro motors, specifically relating to a flat brush, including a brush plate and two elastic arms. Each elastic arm has a connecting part at one end that is horizontally connected to the brush plate. The connecting part extends upward to form a supporting part, and the supporting part extends downward to form a contact part. Multiple brush heads are arranged at intervals on the contact part. The multiple brush heads are arc-shaped, and silver-palladium contact layers are respectively provided on the arc-shaped convex surfaces of the multiple brush heads. The elastic arms of this flat brush are formed by multiple bending to form the connecting part, supporting part, and contact part. The multiple brush heads adopt an arc structure design, which helps to improve the rigidity and elasticity of the elastic arms, avoids deformation due to fatigue accumulation, and ensures more reliable contact between the flat brush and the commutator surface. The brush heads contact the flexible circuit board through the silver-palladium contact layers, which can improve the hardness and wear resistance of the contact surface, effectively reduce the increase in contact resistance caused by wear, and help improve the working reliability of the micro motor and extend its service life.

The utility model provides a kind of pipeline temperature sensing tool and the air conditioner comprising it, it is related to air conditioning technical field, solve the technical problem that temperature sensing element dismounting is complex, material demand is much, cost is high, sampling is lost true, the pipeline temperature sensing tool, including handle, clamping part, temperature sensing element;Handle includes first arm and second arm, first arm and second arm middle part are hinged to form scissor type structure;Clamping part is set on first arm and second arm, to be measured pipeline is clamped from two sides respectively;Temperature sensing element is set on part or all clamping part, to carry out pipeline temperature acquisition.The utility model is used for pipeline temperature measurement, with the characteristics of novel sampling mode, strong structure universality, scientific and reasonable wiring mode, convenient and efficient operation, cost saving of repeated use.

A contact system includes a contact support and a moving contact. The moving contact has moving contacts at both ends that mate with stationary contacts. The contact support has two raised mounting protrusions on the side away from the stationary contacts, and a clearance notch between the two mounting protrusions. Each of the two mounting protrusions of the contact support has at least one contact spring, and the contact springs on the two mounting protrusions are respectively connected to the two ends of the moving contact where the moving contacts are located. A changeover switch includes a housing and a contact system. The housing contains a load terminal, a power supply I terminal, and a power supply II terminal. The load terminal is electrically connected to the moving contact. Two stationary contacts are respectively located on the power supply I terminal and the power supply II terminal. In this invention, the contact support has a notch design on the side near the load terminal, and two mounting protrusions are spaced apart for mounting contact springs, saving space and increasing the rotation angle of the contact support.

The application discloses a high-voltage direct-current relay with auxiliary contact, which comprises two static contacts, a moving contact, a push rod, a coil assembly, a moving iron core and an auxiliary contact. The moving iron core is movably arranged in the coil assembly and is fixedly connected with the push rod. The moving contact is movably connected with the push rod and cooperates with the two static contacts. The auxiliary contact comprises two auxiliary spring sheets arranged in the coil assembly, and the two auxiliary spring sheets are respectively provided with leading ends. The push rod has an insulating part and a conductive part arranged in an up-down manner. With the up-down movement of the push rod, the two auxiliary spring sheets clamp the conductive part or the insulating part of the push rod to realize the on-off of the auxiliary contact. The application can not only realize the monitoring function of the auxiliary contact by the cooperation of the two auxiliary spring sheets and the push rod, but also can offset the rebound force of the moving contact when the moving contact is released by the contact friction force of the two auxiliary spring sheets and the conductive part or the insulating part of the push rod.