570 results about "Contact system" patented technology

The invention relates to a relay and an electric meter. The relay comprises an electromagnetic pushing system, the electromagnetic pushing system comprises a coil and an armature assembly, the armature assembly is located on one side of the coil in the first direction, and the axis direction of the coil is in the third direction; the contact system is located on the third direction side of the electromagnetic pushing system and comprises a static contact unit and a movable contact unit which are arranged in the third direction, the movable contact unit is connected with the armature assembly, one end of the movable contact unit is fixed to the relative position of the static contact unit, and the other end of the movable contact unit is suitable for being driven by the armature assembly to be close to or away from the static contact unit; the terminal group is positioned on one side, deviating from the electromagnetic pushing system, of the contact system and is connected with the static contact unit and the movable contact unit; wherein the first direction is perpendicular to the third direction. According to the invention, the space layout of the relay is more reasonable, the structure is more compact, the occupied space is effectively reduced, the relay can be better matched with other parts, and the applicability is good.

The invention relates to a relay and an electric meter. The relay comprises a contact system, wherein the contact system comprises a movable contact unit and a static contact unit; a pushing system; the connecting structure is connected with the pushing system and the moving contact unit, and the connecting position of the connecting structure and the pushing system is located on the side, away from the static contact unit, of the moving contact unit. According to the application, the pushing system is connected with the moving contact unit through the connecting structure, and the connecting position of the connecting structure and the pushing system is located on the side, away from the static contact unit, of the moving contact unit, so that when the moving contact and the static contact are closed to generate an arc, the moving contact unit can block the arc to prevent ablation of the pushing system; and the overall reliability and service life of the relay are effectively improved.

The invention relates to the technical field of railway catenary monitoring, in particular to a multi-source sensing fusion method and system for state evaluation of a catenary compensation device, and the method comprises the steps: obtaining multi-source sensing data such as vibration, temperature and current, generating a phase space trajectory through employing a self-adaptive phase space reconstruction technology, and carrying out the state evaluation of the catenary compensation device; multiple topological features are extracted to form topological feature vectors, and the vectors are combined with temperature and current data to construct a fault probability model. According to the method, the health degree score of the contact network compensation device can be calculated, trend prediction can be carried out, early warning information can be generated, high-precision early warning is realized, the clamping stagnation risk of the pulley block can be predicted three months in advance, passive response is converted into active prevention, the maintenance efficiency and safety of the contact network are remarkably improved, and the maintenance cost is reduced. By means of the innovative technology, the safety of railway operation is improved, the maintenance cost is reduced, and revolutionary transformation is brought to the railway industry.

The invention discloses a method and a system for evaluating the reliability of a contact network system under an icing galloping condition. The method comprises the following steps: collecting icing galloping data of the overhead line system in real time, and carrying out load conversion and statistics on parts of the overhead line system in icing galloping by adopting a rain flow counting method; the reliability of parts under the icing galloping condition is calculated through the Miner cumulative damage theory, and weight distribution of the overhead line system is conducted through an analytic hierarchy process; based on the reliability and the weight distribution result of each part under the icing galloping condition, evaluating the reliability of the overhead line system of the data acquisition anchor section until the evaluation task is finished; the method and the system provided by the invention are suitable for evaluating the operation reliability of the contact network system in the icing galloping section, can provide support for operation and maintenance of the contact network system after icing galloping occurs, and have wide application prospects.

The utility model relates to the technical field of electronic control devices, in particular to a relay, which comprises an insulating cover, a contact structure and a protective structure, and is characterized in that the contact structure is accommodated in the insulating cover; the protective structure is arranged on the circumferential side wall of the insulating cover, the protective structure is in contact with at least part of the circumferential side wall of the insulating cover, the protective structure comprises an elastic part, and the elastic part can apply pressure towards an inner cavity of the insulating cover to the insulating cover; and / or, the protection structure comprises a rigid part, and the rigid part can apply pressure towards the inner cavity of the insulation cover to the insulation cover, so that a safety protection effect can be achieved under extreme working conditions of short circuit, overload breaking and the like of the contact system, the sealing reliability of the cavity and the structural strength of the insulation cover are improved, and the high short circuit resistance requirement of a user is met.

The utility model relates to the field of circuit protection, in particular to a contactor integrated with an excitation function, and an excitation ignition assembly, a first piston, a first conductive part, an auxiliary contact system, a push rod, a melt, an air passage, a second piston and an elastic part are integrated in the contactor. The melt and the auxiliary contact system are connected in series and then are connected in series between the two static contacts. In a normal working state, the auxiliary contact system is insulated and disconnected, when an overload current, a short-circuit current or an abnormal condition occurs, the ignition assembly is excited to act to drive the first piston and the first conductive piece to move, the first conductive piece enables the auxiliary contact system to be conducted and closed, and the melt is connected into a main loop in a parallel connection mode; and then the second piston and the elastic piece are driven to displace through the air passage, so that the contact system is switched off, the elastic piece generates irreversible deformation, and the first piston and the first conductive piece push the push rod to disconnect the melt. According to the invention, the power loss is low, zero-current cut-off of a main loop can be realized, and the breaking capacity and the breaking reliability are improved.

The utility model relates to the field of circuit protection, in particular to an excitation integrated contactor with high breaking capacity, which comprises a driving system and a contact system, and further comprises an integrated excitation source, an excitation action assembly and an elastic piece, the elastic piece is arranged for one moving contact, one end of the elastic piece is fixed, the other end of the elastic piece is a free end, the excitation action assembly is fixedly connected with the free end of the elastic piece, the excitation source drives the excitation action assembly to move, the contact system is forcibly opened, and meanwhile, the elastic piece generates elastic deformation capable of restoring to the initial position; and the elastic piece, the moving contact and the excitation action assembly are all reset to initial positions during normal opening. The contactor has normal functions of the contactor and also has large current breaking and resetting functions, so that normal use of the contactor is ensured while the breaking range of the contactor is widened.

The invention relates to the technical field of switch technology, in particular to a residual current action photovoltaic protection switch, which comprises a shell, a fixed contact system, an operating mechanism I, an operating mechanism II, an arc extinguishing system and an electronic monitoring unit, and is characterized in that the fixed contact system, the operating mechanism I, the operating mechanism II, the arc extinguishing system and the electronic monitoring unit are arranged in the shell; a permanent magnet is arranged in the side wall of an arc extinguish chamber of the arc extinguish system, a second electromagnetic coil is arranged on the bottom wall of the arc extinguish chamber of the arc extinguish system, and a magnetic field generated by the permanent magnet is perpendicular to a magnetic field generated by the second electromagnetic coil. A magnetic field generated by the permanent magnet and a magnetic field generated by the second electromagnetic coil are overlapped, so that the arc is lengthened under the acting force of the magnetic field, an arc channel is arranged on the arc chute in a matched mode, a spiral groove is formed in the arc channel, the arc moves along the spiral groove, and the motion path of the arc is lengthened until the arc disappears.

According to the contact mechanism, the contact system and the DC contactor of the utility model, the auxiliary moving contact module moves with the moving part transmission member and the moving contact bridge on the transmission member in an interlocking manner, the dimension chain is short, and the movement stroke is stable and reliable; as the reed is in interlocking fit with the transmission piece and the movable contact bridge through the base, the transmission piece can push the base to enable the movable contact bridge and the reed to synchronously perform disconnection motion, and inevitable disconnection can be ensured through larger main spring counterforce even if the reed is adhered to the auxiliary static contact, so that the on-off states of the main contact and the auxiliary loop are ensured to be consistent.

The invention relates to the technical field of life evaluation, in particular to a circuit breaker life evaluation method and system for switching an alternating current filter in an extra-high voltage converter station, and the method comprises the steps: collecting multi-dimensional operation data in the operation process of a circuit breaker in real time; extracting a high-frequency-band energy ratio as a contact system abrasion loss characteristic parameter; establishing an arcing energy accumulation model according to the arc light intensity time sequence signal, and calculating an effective arcing energy value of a single operation; constructing a life weight distribution model, inputting the wear loss characteristic parameters, the arcing energy accumulation value and the environment temperature and humidity data into the model, and outputting a mechanical wear index, an electric corrosion index and an environment degradation index; establishing a three-axis linkage correction function; generating a comprehensive life evaluation index based on the corrected mechanical wear index, electric corrosion index and environmental degradation index, and triggering an early warning signal when the index exceeds a preset threshold value; according to the invention, by establishing the life evaluation model based on multi-dimensional data fusion, the precision and reliability of life prediction of the circuit breaker of the extra-high voltage converter station are significantly improved.

The invention relates to a contact device (15), a contact system (20), and a method for assembling the contact system (15), wherein the contact device (15) comprises a contact element arrangement (65) with at least one contact element (70), and a housing (60) with a foil housing part (80), wherein the contact element (70) comprises a connecting section (160), at least one strain relief section (175, 180) arranged on the connecting section (160), and a cutting arrangement (170) arranged on the connecting section (160) with at least one first cutting element (200), wherein the foil housing part (80) comprises a foil housing wall (120), a receiving area (155), a foil receptacle (280), a first cutting edge receptacle (285), a first web (250), a third housing opening (130), and a bending space (286).wherein the bending space (286) adjoins the foil housing wall (120) on the inside and extends between the first web (250) and the third housing opening (130) along the insertion axis (115), wherein the foil receptacle (280) adjoins the foil housing wall (120) on the inside and the first web (250) separates the foil receptacle (280) from the first cutting receptacle (285), wherein the foil receptacle (280) and the first cutting receptacle (285) extend along the insertion axis (115) from the receiving area (155) in the direction of the third housing opening (130) and open into the bending space (286).

The invention belongs to the field of electrified rail transit overhead contact systems, and provides an overhead contact system diagnosis method and system based on a standard state, a storage medium and electronic equipment. The method comprises the following steps: constructing standard state data based on contact network detection parameters; obtaining any parameter data in the pantograph-catenary comprehensive detection period of the catenary, carrying out single parameter analysis based on the standard state data, and judging a stationary span and an abnormal span; performing multi-parameter association analysis on the abnormal span to obtain all abnormal parameter association data in the abnormal span; and substituting the abnormal parameter associated data into an interaction item regression model to obtain a dependent variable value of the interaction item regression model, and speculating the cause of the abnormality of the overhead line system. According to the method, diagnostic analysis and anomaly recognition of the parameters can be automatically completed, the possibility of manual intervention and misjudgment is reduced, and the operation and maintenance efficiency is improved.

A switching device comprises a shell, a contact system and two electromagnetic systems, the contact system and the two electromagnetic systems are arranged in the shell, the two electromagnetic systems are oppositely arranged on the two sides of the contact system, and each electromagnetic system comprises an upper armature and a coil used for driving the upper armature to move. The upper armatures of the two groups of electromagnetic systems are connected through a linkage shaft, the contact system comprises a static contact and a moving contact 5 arranged on a contact support 4, the linkage shaft is connected with the contact support, and the two groups of electromagnetic systems respectively drive the contact support to move through the linkage shaft. The contact support drives the moving contact to be in contact with or separated from the static contact, the driving force is large, the action response is fast, the balance is good, and the height of the switching device can be reduced.

The utility model discloses a contact system, and the contact system is characterized in that a first hinge shaft is an integrated part, and the first hinge shaft comprises two first shaft parts and a first spacing part which connects the two first shaft parts; the device further comprises a spacer, the spacer is an integrated piece, and the spacer comprises two second shaft parts and a second spacer part connecting the two second shaft parts. A first shaft hole and a second shaft hole are formed in the contact blade, the first shaft hole is located in the contact mounting cavity, and the second shaft hole is located outside the contact mounting cavity; the first shaft holes are matched with the first shaft parts in size, and the two contact blades are arranged on the two first shaft parts in a sleeving mode through the first shaft holes respectively and are separated through a first interval part; the size of the second shaft hole is matched with that of the second shaft part, and the two contact blades are arranged on the second shaft part in a sleeving mode through the second shaft hole and are separated through the second interval part. According to the utility model, the two contact blades can be more convenient to produce, assemble and the like.

Energy storage unit, wherein the energy storage unit can in particular be an energy storage module and / or can provide electrical energy for the propulsion of a motor vehicle, wherein the energy storage unit comprises: several energy storage elements, preferably several electrochemical energy storage elements, e.g. several battery cells; and a temperature control fluid barrier, wherein the temperature control fluid barrier extends around a temperature control chamber and at least a plurality of the energy storage elements can be temperature controlled by means of a temperature control fluid in the temperature control chamber.

A contact system of an isolating switch and the isolating switch, the isolating switch comprises an operating mechanism and at least one contact system, the operating mechanism and the contact system are stacked, and the operating mechanism is connected with a rotating part of the contact system; the contact system comprises a shell, a moving contact assembly, a static contact and an arc extinguish chamber, the moving contact assembly, the static contact and the arc extinguish chamber are arranged in the shell, the moving contact assembly comprises a rotating part and a moving contact, the arc extinguish chamber comprises an arc extinguish cover, a plurality of arc extinguish grid pieces and a permanent magnet, and the permanent magnet is arranged on the arc extinguish cover and located between the arc extinguish grid pieces and the rotating part. The arc-extinguishing grid sheets are provided with gaps facing the permanent magnet, the gaps of the plurality of arc-extinguishing grid sheets form an arc channel, during opening action, an arc passes through the arc channel along with the moving contact, at the moment, the arc is located in the arc channel formed by the arc-extinguishing grid sheets and is concentrated on one side of the permanent magnet, and under the action of Lorentz force generated by the permanent magnet, the permanent magnet is separated from the moving contact. The arc can be quickly led to the arc extinguishing grid sheets, the arcing time is shortened, and the breaking reliability of the switching device is improved.

The utility model provides a moving contact and a contact system of a direct current circuit breaker, the moving contact comprises two pieces which are respectively marked as a left moving contact and a right moving contact, the left moving contact and the right moving contact are symmetrically arranged, a gap exists between the left moving contact and the right moving contact, the left moving contact is provided with a left silver contact, and the right moving contact is provided with a right silver contact. A left silver contact is arranged on the left moving contact, a left arc contact is further detachably installed on the left moving contact above the left silver contact, a right silver contact is arranged on the right moving contact, a right arc contact is further detachably installed on the right moving contact above the right silver contact, an elastic piece is arranged between the left moving contact and the right moving contact, and through kidney-shaped holes are further formed in the left moving contact and the right moving contact. And the kidney-shaped hole is formed above the elastic piece. According to the utility model, the arcing contact is contacted before the silver contact in the closing process, and the silver contact is disconnected before the arcing contact in the opening process, so that the service life of the moving contact can be effectively prolonged, the moving contact has the characteristics of large current capacity and long service life, and the safety and reliability of the circuit breaker in the using process are improved.

The invention relates to the technical field of non-variable-capacity pump set parallel control, and discloses a multi-blower parallel air volume control method, which comprises the following steps of: acquiring the real-time rotating speed and the real-time input power of a driving frequency converter of each single blower in a parallel system, and superposing a periodic rotating speed perturbation signal at a common pressure given value to obtain a multi-blower parallel air volume control result; power response amplitudes of all single blowers are extracted synchronously, the change rate of real-time power relative to the rotating speed is calculated to generate a power response gradient representing the energy conversion characteristic of the unit, the unbalanced blowers are recognized according to deviation parameters of the power response gradient relative to the global average value, the rotating speed instruction gain of the blowers is reduced, and the unit energy conversion characteristic is obtained. According to the method, load distribution is converted into an active adjustment mechanism based on the physical characteristics of the impeller, accurate identification of the offset of the physical operation sites of the parallel unit is achieved, and the accuracy of the offset of the physical operation sites of the parallel unit is improved on the premise that branch flow sensing hardware is not needed. And the recessive surge risk caused by single-machine performance discretization is inhibited.

Provided are a contact system, a contact unit and a circuit breaker. The contact system includes a moving contact assembly arranged in a shell and a pair of static contact assemblies. The moving contact assembly includes an arc isolation portion which is assembled rotatably. The arc isolation portion is provided with a contact groove inside. A pair of moving contact portions are arranged in the contact groove. Each static contact assembly includes a static contact portion which extends into the contact groove. The arc isolation portion rotates and drives the pair of moving contact portions to be in contact with or separated from the static moving portion in the contact groove. An edge of the arc isolation portion is also provided with a pair of mounting grooves which are communicated with the contact groove, and each mounting groove is at least reserved with a notch for the static contact portion to be placed at one end surface of the arc isolation portion. According to the present invention, when the contact system is assembled, the static contact portion of the static contact assembly is arranged correspondingly from the notch and can be placed in the contact groove at an appropriate angle without lifting the static contact portion, which simplifies the step of assembling the contact system, is convenient in operation, can achieve automatic assembly and is conducive to reducing the cost.

The utility model relates to a relay and an electric meter. The relay comprises an electromagnetic pushing system, the electromagnetic pushing system comprises a coil and an armature assembly, the armature assembly is located on one side of the coil in the first direction, and the axis direction of the coil is in the third direction; the contact system is located on the third direction side of the electromagnetic pushing system and comprises a static contact unit and a movable contact unit which are arranged in the third direction, the movable contact unit is connected with the armature assembly, one end of the movable contact unit is fixed to the relative position of the static contact unit, and the other end of the movable contact unit is suitable for being driven by the armature assembly to be close to or away from the static contact unit; the terminal group is positioned on one side, deviating from the electromagnetic pushing system, of the contact system and is connected with the static contact unit and the movable contact unit; wherein the first direction is perpendicular to the third direction. According to the invention, the space layout of the relay is more reasonable, the structure is more compact, the occupied space is effectively reduced, the relay can be better matched with other parts, and the applicability is good.

A circuit breaker provided by the present invention comprises a housing and internal elements, the internal elements at least comprise an upper arc extinguish chamber, a lower arc extinguish chamber, a double-breakpoint contact system, a first wiring terminal, a second wiring terminal, an overload release, a mechanism and a rotating shaft, and the double-breakpoint contact system comprises a single-breakpoint moving contact, a double-breakpoint moving contact and a static contact. The mechanism drives at least one rotating shaft, the double-breakpoint contact system is arranged between the upper arc extinguish chamber and the lower arc extinguish chamber, and the single-breakpoint moving contact and the double-breakpoint moving contact are respectively driven by two rotating shafts. When the circuit breaker is subjected to breaking and manual operation opening, the mechanism drives the two sets of rotating shafts to move together so that the two breakpoints can be kept disconnected at the same time, the opening distance is large, the isolation performance is good, and high-short-circuit current under high voltage can be broken.

The invention belongs to the technical field of high-voltage switch equipment, and discloses a grounding switch contact system, which comprises a static contact assembly, a moving contact assembly and an insulating cylinder, the static contact assembly comprises a static arc contact, the moving contact assembly comprises a moving contact body, a cylinder body and a piston, the moving contact body is provided with a contact cavity, and the insulating cylinder is provided with an insulating cylinder. The moving contact body and the piston are fixedly connected and are jointly arranged in the cylinder body in a sliding mode, an air chamber is formed between the piston and the cylinder body, the moving contact body is arranged in the arc extinguishing cavity of the insulating cylinder in a sliding and penetrating mode, and the moving contact body is provided with a first through hole, an air channel and a second through hole; the second end of the first through hole penetrates through the outer side wall of the moving contact body and is finally arranged outside the insulating cylinder and the air chamber, the two ends of the air channel are communicated with the air chamber and the second through hole respectively, and the second end of the second through hole penetrates through the outer side wall of the moving contact body and is always arranged in the arc extinguishing cavity. The system not only can ensure accelerated recovery of the arc gap insulating gas, but also can ensure effective heat dissipation of the arc gap, and effectively promotes arc extinguishing.

The utility model discloses a magnetic latching relay, and belongs to the technical field of magnetic latching relays. The magnetic latching relay comprises a main terminal strip, the main terminal strip comprises a live wire inlet copper terminal and a live wire outlet copper terminal which are arranged in parallel at an interval, the end part of the live wire outlet copper terminal is provided with a static contact, the magnetic latching relay further comprises a movable contact spring, one end of the movable contact spring is fixedly arranged at the end part of the live wire inlet copper terminal, and the other end of the movable contact spring is fixedly arranged at the end part of the live wire outlet copper terminal. And a movable contact matched with the static contact is arranged at the other end of the movable contact. A static leading-out end and a movable leading-out end are omitted, the movable contact spring riveted with the movable contact is fixed on the live wire inlet copper terminal of the main terminal strip, the static contact is directly fixed on the end face of the live wire outlet copper terminal, and a contact system which is short in loop, small in resistance and little in heat is formed. And compared with a conventional magnetic latching relay, the magnetic latching relay is more material-saving, the material cost is greatly reduced, the manual production is simpler, and the magnetic latching relay has higher market competitiveness.

The application relates to the field of low-voltage electrical apparatus, in particular to a contact system and a switch electrical apparatus comprising the same, the contact system comprising a pivotally arranged rotary contact structure and at least one movable contact structure, the rotary contact structure comprising a rotary contact, the rotary contact comprising a rotary contact part, the movable contact structure comprising a movable contact, the movable contact comprising a movable contact part, the rotary contact part and the movable contact part being combined to make the rotary contact and the movable contact closed when the rotary contact is in a closed position; the movable contact structure further comprising an elastic member matched with the movable contact; during the breaking process of the rotary contact and the movable contact, the elastic member stores energy when the rotary contact part drives the movable contact part to move from an initial position to a disengagement position, the rotary contact continues to rotate, the elastic member releases energy to drive the movable contact part to reset to the initial position; the contact system and the switch electrical apparatus have high breaking capacity.

The utility model relates to the field of low-voltage electric appliances, in particular to a circuit breaker, a main loop of which comprises an operating piece, an operating mechanism in transmission fit with the operating piece, a contact system and an arc extinguishing system matched with the contact system, and the operating mechanism comprises a locking piece and a tripping piece which are in hasp fit. The contact system comprises a moving contact and a static contact which are in transmission connection with the operating mechanism; a sampling device is coupled with a contact system, a control system is at least used for controlling a tripping system to act when short-circuit current and / or overload current flows through the contact system, and the tripping system acts to be used for releasing hasp matching of a tripping fastener and a locking fastener so as to drive a circuit breaker to be opened; the circuit breaker is suitable for various current protection threshold requirements.

The utility model relates to a recoverable excitation integrated contactor with active and passive integrated protection, which comprises a driving system, a contact system, an excitation ignition assembly, a magnetic tripping device, a microswitch, a first piston, a second piston, a melt cutting push rod, an auxiliary contact system and an arc extinguishing melt, the drive coil loop is connected with a trigger loop of the excitation ignition assembly in parallel and connected with a normally-closed contact and a normally-open contact of the microswitch in series, the state change of the drive coil loop and the trigger loop is controlled through a magnetic tripping device linked with the microswitch, and a trigger signal is provided for the excitation ignition assembly. The first piston is driven to enable the auxiliary contact system to be conducted so that the arc extinguishing melt can be connected to the main loop in parallel, the second piston is driven to drive the elastic piece to move so that the contact system can be forcibly opened, and then the first piston drives the melt cutting-off push rod to disconnect the arc extinguishing melt. Through excitation integration, the breaking capacity of the contactor is improved, and the current matching difficulty with the fuse is reduced; and after the protection action, the normal switching-on and switching-off functions of the contactor are maintained.

The utility model relates to the technical field of low-voltage switches, and particularly discloses a direct-current contactor shell and a direct-current contactor, the direct-current contactor shell comprises a transparent glass shell, the transparent glass shell is provided with an internal cavity capable of accommodating a moving contact system, the transparent glass shell is provided with a mounting hole, and the transparent glass shell is provided with a binding post arranged in the mounting hole in a penetrating manner; kovar sealing sleeves for sealing are arranged between the mounting holes and the binding posts; the kovar sealing sleeve is sleeved on the outer side wall of the binding post, and the inner side surface of the kovar sealing sleeve is attached to the outer side wall of the binding post; the outer side face of the Kovar sealing sleeve is attached to the inner wall of the mounting hole. The high-temperature-resistant and high-pressure-resistant cable is convenient to produce and has good gas tightness and excellent high-temperature-resistant performance, meanwhile, hydrogen can be used as protective gas, and the arc blocking performance can be improved conveniently.

The invention provides a social contact method, a server, a social contact system and a storage medium. The method comprises the steps that a social contact request triggered by a first user through an electronic device is acquired, the social contact request comprises a social contact type, and the social contact type is user social contact or virtual branch social contact; acquiring a second user meeting an information delivery condition according to the information delivery condition set by the first user; if the social contact type is user social contact, social contact release information set by the first user is released to a receiving end, so that a second user of the receiving end is in social contact with the first user; and if the social contact type is virtual cloned social contact, generating a first virtual cloned according to cloned information set by the first user, and controlling the first virtual cloned to perform social contact with a second user or a second virtual cloned of the second user. According to the method, the social efficiency is improved, and the social experience of the user is improved.

The present invention relates to the field of electrical low-voltage devices, and in particular to a contact system and an electrical switching device comprising same. The contact system comprises a main contact structure and at least one movable contact structure; the main contact structure comprises a main contact; the main contact comprises a main contact portion; the movable contact structure comprises a movable contact; the movable contact comprises a movable contact portion; when the main contact is located at a closed position, the main contact portion and the movable contact portion are connected to enable the main contact and the movable contact to be closed; the movable contact structure further comprises an elastic piece working in conjunction with the movable contact; and in the process of the main contact being disconnected from the movable contact, when the main contact portion drives the movable contact portion to move from an initial position to a disengaged position, the elastic piece stores energy such that the main contact continues to operate, and the elastic piece releases energy to drive the movable contact portion to reset to the initial position. The contact system and the electrical switching device have high breaking capacity.

The invention relates to the technical field of worm size detection, and discloses a worm key size precision detection device and a detection method, the worm key size precision detection device comprises a detection table, the detection table is provided with a detection box used for detecting a worm, and the detection box is internally provided with a feeding assembly used for driving the worm to move. According to the scheme, flexible positioning and mechanical linkage design is adopted, and an efficient and accurate detection process is achieved. The core lies in that the feeding assembly and the positioning structure cooperatively operate, on one hand, a worm can adjust the position in a self-adaptive mode through an elastic floating mechanism, and stable clamping is ensured through cooperation with a multi-direction rolling contact system; and on the other hand, the moving part is combined with hydraulic drive to achieve horizontal conveying, meanwhile, gear and rack transmission is converted into vertical positioning, and therefore the worm can be accurately positioned in the conveying process. And meanwhile, the scheme also comprises multiple anti-separation mechanisms, so that the operation reliability is ensured, the operation convenience and the process stability are both considered in the overall design, and an efficient solution is provided for worm detection.