180 results about "Vacuum interrupter" patented technology

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

A contact for a vacuum interrupter of a low, medium or high-voltage switchgear includes a contact rod composed of a first electrically conductive material and extending along a longitudinal axis of the contact, and a contact piece composed of a second electrically conductive material and fastened to an end face of the contact rod. The contact rod and the contact piece are materially bonded to one another at a connecting face. At least one of the contact rod or the contact piece has a wall which delimits the connecting face, rises perpendicularly to the longitudinal axis and is disposed such that the contact piece and the contact rod are also force-lockingly connected to one another by a force acting transversely to the longitudinal axis between the contact piece and the contact rod. A production method for such a contact is also provided.

The invention relates to a method and system for detecting the vacuum degree of a vacuum arc-extinguishing chamber based on high-frequency discharge and spectral analysis, and the method comprises the steps: exciting the interior of the vacuum arc-extinguishing chamber to generate field emission current through a high-frequency electric field, and obtaining a high-frequency current peak value through the spectral analysis of the field emission current; the vacuum degree is determined according to a pre-constructed vacuum degree-high-frequency current peak value standard relation curve, a high-frequency power source is connected to a vacuum arc extinguish chamber, the output voltage of the high-frequency power source is gradually increased until a vacuum gap breaks down, the voltage waveform in the process is recorded, and the total current of a loop is calculated; calculating a capacitive current component by combining the equivalent capacitance of the loop; and selecting a stable current section between two dielectric breakdown events in the total current, intercepting a current peak signal in the section, and subtracting the capacitive current component from the total current corresponding to the peak signal to obtain the field emission current. Compared with the prior art, the method has the advantages of high sensitivity, simplicity and convenience in operation, accurate result and the like.

An intelligent sensing type primary and secondary fusion circuit breaker disclosed by the present invention comprises a circuit breaker body, the bottom of the circuit breaker body is provided with an installation assembly used for supporting, the installation assembly is internally provided with an intelligent sensing assembly, the circuit breaker body comprises a circuit breaking box body, and the top of the circuit breaking box body is fixedly provided with three three-phase pole columns. One side of each of the three three-phase poles is fixedly provided with a vacuum arc-extinguishing chamber; by breaking through the limitation of physical integration of traditional primary and secondary fusion equipment instead of function cooperation, full-link deep fusion is perceived, analyzed and controlled, a multi-dimensional synchronous perception network and an AI fault prediction model are matched, a protection mode is upgraded to initiative early warning from post-event tripping, the early warning accuracy is improved, and the method is adaptive to complex working conditions and weak communication scenes and has a wide application prospect. The fault detection time is shortened to a millisecond level, the fault isolation time is less than 30 seconds, the power supply recovery efficiency is improved compared with that of traditional equipment, the fault positioning precision is enhanced, and the manual inspection cost is greatly reduced.

The utility model discloses a two-body vacuum arc-extinguishing outdoor grading ring comprising a first arc-shaped member and a second arc-shaped member, the first arc-shaped member and the second arc-shaped member are made of the same metal material, the inner side of the first arc-shaped member is provided with a first arc-shaped groove, the inner side of the second arc-shaped member is provided with a second arc-shaped groove, and the first arc-shaped groove and the second arc-shaped groove are made of metal materials. The first arc-shaped piece and the second arc-shaped piece are oppositely connected to form a complete circular ring, the first arc-shaped piece and the second arc-shaped piece are connected through screws, and the two ends of the first arc-shaped groove and the two ends of the second arc-shaped groove are connected to form a complete circular-ring-shaped groove. According to the utility model, the condition of non-uniform distribution of electric fields on the outer edge surface of the vacuum arc-extinguishing chamber is improved, and the flashover phenomenon on the edge surface in the aging process is reduced.

The utility model discloses an assembly tool for a vacuum arc extinguish chamber assembly of a pole-mounted circuit breaker, and belongs to the field of pole-mounted circuit breakers, the assembly tool comprises a base, a positioning assembly, a supporting assembly, a limiting assembly and a push-pull assembly, the positioning assembly is arranged on the base, the supporting assembly and the positioning assembly are correspondingly arranged at an interval, the limiting assembly is arranged on the push-pull assembly, and the push-pull assembly is arranged on the base. And the push-pull assembly is used for driving the vacuum arc-extinguishing chamber assembly to extend into or retreat from the insulating part. According to the utility model, the push-and-pull assembly drives the vacuum arc-extinguishing chamber assembly to extend into the conical inner cavity of the insulating part, and a worker does not need to push and pull the vacuum arc-extinguishing chamber assembly manually, so that the labor intensity of the worker is reduced, time and labor are saved, and the assembly efficiency is improved; through the supporting assembly, the vacuum arc-extinguishing chamber assembly and the insulating part automatically keep coaxial alignment, so that time waste caused by repeated adjustment of the vacuum arc-extinguishing chamber assembly is avoided, deformation and damage of the silicone rubber sealing sleeve caused by local compression are prevented, and the assembly tightness is ensured.

The invention relates to a method for measuring the internal pressure of at least one vacuum interrupter (12), comprising the following steps: applying a voltage (U) between an anode and a cathode of the vacuum interrupter (12), applying a magnetic field (F) to deflect an electron path, measuring a discharge current of gas particles that have been struck and thereby ionized by electrons and have discharged in a vacuum of the vacuum interrupter (12), and measuring the internal pressure by converting the discharge current (I), wherein the measurement of the discharge current (I) is carried out in a defined sub-region (24) of the vacuum interrupter (12). The invention further relates to a measuring system (10) for operating such a method.

A system and method for operating a vacuum interrupter in a self-resetting interrupter. The method includes detecting fault current, opening the vacuum interrupter a first time using power harvested from the current transformer when the fault current is detected, and storing a polarity of the detected fault current when the vacuum interrupter is opened. The method then determines a close time to close the vacuum interrupter so that the current has the same polarity that was stored when the vacuum interrupter was opened and that actuation of closing the vacuum interrupter ends at a current zero crossing, closes the vacuum interrupter at the close time, and opens the vacuum interrupter a second time after the vacuum interrupter is closed using power harvested from the current transformer.

The invention discloses a production line and a method for pretreatment of a vacuum arc-extinguishing chamber, workpieces are automatically transferred among special stations by a robot, manual carrying, waiting and loading and unloading time among working procedures is eliminated, and a carrying robot, a loading area, a plasma cleaning area, a brushing area and an unloading area are all connected with a control unit. Different working areas can be controlled through the control unit, so that the overall processing time of a single product is remarkably shortened, the production efficiency is higher, each workpiece is processed at the same position in a unified processing flow, the processing quality is more unified and stable, and the labor intensity of workers is reduced.

The utility model discloses a contact of a vacuum arc-extinguishing chamber, which belongs to the technical field of power transmission and transformation, and comprises cams, a plurality of cams are arranged in a ring sleeve, the cams surround the contact, the contact is arranged in the ring sleeve, the contact and the ring sleeve are coaxial, sliding sleeves are arranged on the cams in a sliding manner, a plurality of sliding sleeves are abutted against the outer wall of the contact, and the sliding sleeves are arranged on the outer wall of the contact. An anti-skid rubber pad is arranged on the face, making contact with the contact, of the sliding sleeve, and the bottom of the ring sleeve is in threaded connection with a bottom plate. The adjusting assembly is used for adjusting the relative height of the sliding sleeve on the cam; the positioning assembly is used for limiting the contact; according to the utility model, impurities can be effectively prevented from influencing the discharge stability of the contact.

The invention discloses a brazing method for a sapphire-ceramic vacuum arc-extinguishing chamber window and application of the brazing method. The brazing method comprises the steps that an activation layer, a barrier layer and a brazing layer are sequentially deposited on a sapphire brazing face, and a molybdenum-manganese method is used for sintering and chemical nickel plating is carried out on an annular trepanning area of a ceramic shell; the oxygen-free copper metal foil, the kovar alloy metal foil and the nickel metal foil are compounded into a whole, the oxygen-free copper side of the obtained annular composite transition ring is aligned with the sapphire brazing layer, the copper brazing filler metal ring is placed in the middle of the annular composite transition ring, the nickel side of the composite transition ring is aligned with the nickel-plated layer at the opening of the ceramic shell, the copper brazing filler metal ring is placed in the middle of the annular composite transition ring, and the obtained assembly is subjected to vacuum brazing. Two high-strength and high-airtightness brazed joints are formed at a time, and therefore the sapphire window is connected to the ceramic shell in a sealed mode through the composite transition ring. By introducing a multi-layer composite transition layer structure, the thermal stress matching problem is effectively solved, so that a sealing interface with ultrahigh air tightness, high mechanical strength and excellent long-term reliability is realized.

Load break switch for controlled interruption of an electrical current, comprising: a switch blade for switching the electrical current; a blade support for supporting and operating the switch blade; a vacuum interrupter for controlled current interruption; and an actuator cam rotatable about a cam axis for operating the vacuum interrupter; wherein the switch blade is electricallyconductive and rotatable at a first blade end about a blade axis and wherein a second blade end is rotationally displaceable, in sequence, to electrically: connect the first blade end to a primary blade contact, connect the first blade end to a secondary blade contact, and disconnect the first blade end; wherein the vacuum interrupter is connected between the primary and secondary blade contacts to provide a shunt circuit for controlled current interruption; wherein the blade support is arranged, at the second blade end, to cause the rotation of the actuator cam to open the vacuum interrupter.

A switching unit includes a pair of switching poles electrically connected in series. Each switching pole includes a vacuum interrupter housing a fixed contact and a movable contact, the movable contact moving between an opening position in which the movable contact is separated from the fixed contact and a closing position in which the movable contact is electrically coupled with the fixed contact. The switch unit includes an improved drive assembly operably coupled to the movable contact of the switch pole to actuate the movable contact.

The utility model discloses a circuit breaker switch for a 24kV circuit breaker switch cabinet, which comprises a vacuum switch and an isolating switch, the vacuum switch comprises a vacuum arc-extinguishing chamber, the isolating switch comprises an isolating switch static contact, the isolating switch static contact is lapped at the static end of the vacuum arc-extinguishing chamber through a connecting device, the connecting device comprises a pressing rod and a contact support, and the pressing rod is in lap joint with the contact support. The compression bar is in threaded connection with the contact support, the compression bar is movably connected with the contact support, and the static contact and the static end of the disconnecting switch are kept in a lap joint state and the fixed height of the vacuum arc-extinguishing chamber is adjusted through the movement of the compression bar, so that the height of the compression bar can be adjusted in the vertical direction, and the fixed height of the vacuum arc-extinguishing chamber is further adjusted; the pressure of the moving contact at the moving end of the three-phase vacuum arc-extinguishing chamber and the wear compensation over-travel of the moving contact are adjusted, so that the lapping effectiveness of the contact within the allowable wear extent range of the contact is ensured.

This invention discloses a single-axis transmission five-position load switch device, including an insulating support housing. The insulating support housing is connected to a primary input terminal and a primary output terminal. It also includes a vacuum interrupter, a moving contact, a grounding stationary contact, and a common stationary contact. The vacuum interrupter is disposed within the insulating support housing, and its stationary end is connected to the primary output terminal. A disconnector stationary contact is connected to the primary input terminal. A rotating shaft is rotatably mounted on the insulating support housing. The moving contact is engaged with the rotating shaft, and its two ends are a first contact portion and a second contact portion, respectively. The grounding stationary contact and the common stationary contact are both disposed within the insulating support housing. The common stationary contact is electrically connected to the moving end of the vacuum interrupter. The moving end of the vacuum interrupter and the rotating shaft are linked together via a linkage mechanism.

The application discloses a vacuum arc-extinguishing chamber with two-stage bellows, which comprises a porcelain shell, a moving contact, a static contact, a guide cylinder, a connecting guide rod, a first-stage bellow and a second-stage bellow; the porcelain shell is provided with a static end cover plate and a moving end cover plate at two ends respectively; the inner end of the guide cylinder is slid through the moving end cover plate and is slid to be arranged outside the moving contact, the inner end of the connecting guide rod is penetrated into the guide cylinder and is connected with the moving contact, and the connecting guide rod is provided with a stop structure; the stop structure is used for stop cooperation with the inner cavities of the guide cylinder at two ends during opening and closing; the first-stage bellow is arranged between the upper end of the guide cylinder and the moving contact, and the second-stage bellow is arranged between the outer periphery of the guide cylinder and the moving end cover plate. The first-stage bellow and the second-stage bellow are connected in series through the guide cylinder, the large opening distance and long stroke are realized through the asynchronous movement of the two-stage bellows during the opening and closing movement, the total length of a single bellow under the same opening distance stroke is reduced, and the mechanical life of the bellow can be greatly improved.

The invention discloses a contact supporting structure of a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber and a using method, and relates to the technical field of vacuum arc-extinguishing chambers. The magnetic control cup comprises a cup base, a contact blade, a magnetic control element, a central supporting body and an anti-rotation limiting piece. The contact blade is combined with the cup base, and the magnetic control element and the center supporting body are arranged in a cavity defined by the cup base and the contact blade. The lower end of the central supporting body is fixed with the contact blade, the upper end of the central supporting body is separated from the inner bottom surface of the cup base, and the periphery of the central supporting body is provided with a magnetic control element placing station. The anti-rotation limiting piece is provided with a fixed end and a limiting end, the fixed end and the cup base are coaxially fixed, and the limiting end extends into the cavity to penetrate through the center supporting body to limit rotation of the center supporting body and restrain the limiting distance of the center supporting body away from the inner bottom face of the cup base. Shunting of the ferromagnetic block and the stainless steel support during opening of the moving and static contacts can be avoided, and a strong longitudinal magnetic field is maintained; the contact is ensured to be sufficiently supported during closing stress, and rotation deformation of the contact finger of the cup base and deformation of the contact are avoided.

The application discloses a processing method of a copper-chromium shielding cylinder for a vacuum arc-extinguishing chamber, and comprises the following steps: S1, copper-chromium forging ingot; S2, rough turning of an outer circle and sawing of a material head; S3, multi-wire cutting processing of a blank, S3-1, rod material solidification, and S3-2, cutting processing; S4, automatic spinning; and S5, finishing of a product. Compared with a traditional copper-chromium shielding cylinder formed by extrusion, the copper-chromium shielding cylinder has the advantages of high utilization rate, fast forming speed, good surface quality, high precision, no influence of the size and specifications of the shielding cylinder, suitability for various products, simple change of types, and suitability for batch production and manufacturing.

The utility model discloses a thermostable vacuum switch tube contact structure, which relates to the technical field of vacuum switch tube contact structures, and comprises a vacuum tube, a sealing sleeve is arranged on the vacuum tube, a static contact and a moving contact are arranged in the vacuum tube, iron core assemblies are arranged on the static contact and the moving contact, one end of the static contact is provided with a static end conducting rod, and the other end of the static end conducting rod is provided with an iron core assembly. One end of the moving contact is provided with a moving conductive rod, and the moving conductive rod is provided with an elastic sheet. According to the utility model, through the arrangement of the elastic sheet, the elastic sheet instantly generates deformation and changes from downward bending to upward bending, so that the moving contact and the static contact are rapidly driven to be separated through the spherical surface, arc generation caused by insufficient contact and separation speed of the moving contact and the static contact is avoided, and the working safety of the contact structure is guaranteed; through the mutual cooperation of the longitudinal groove, the magnet and the arc striking groove, the electric arc is led out through the arc striking groove and enters the longitudinal groove after being generated at the center of the contact, thereby preventing the electric arc from gathering, achieving the rapid arc extinguishing, and improving the breaking capacity.

The vacuum interrupter includes a nominally cylindrical insulator having a first insulating portion and a second insulating portion with a gap defined between them, and a nominally cylindrical vapor shield having a first ring with a plurality of spaced bobbles and a second ring with a plurality of spaced bobbles. A gap ring, including a series of spaced notches facing the vapor shield, is positioned within the gap. The bobbles in the first and second rings are configured such that the bobbles in the second ring pass through the notches in the gap ring and the bobbles in the first ring rest on the gap ring.

The present application relates to a kind of vacuum interrupter vacuum degree on-line detection system and method, belong to high-voltage switchgear field.Therein, the method includes the following steps: receiving voltage sensor in the dynamic conducting rod and static conducting rod of vacuum interrupter separate or contact when collected voltage waveform data and current sensor in the dynamic conducting rod and static conducting rod of vacuum interrupter separate or contact when collected current waveform data;When the voltage waveform data and current waveform data collected and corresponding data under normal vacuum degree are not consistent, then vacuum interrupter vacuum degree exists abnormal;Wherein, voltage waveform data and current waveform data are the data under same time;Voltage sensor is installed on static conducting rod, and current sensor is installed on dynamic conducting rod.The present application can improve the accuracy of detecting vacuum interrupter vacuum degree.

The invention discloses a method for improving the insulation performance of a windowing vacuum arc-extinguishing chamber by designing a coating based on an optimization model, and the method comprises the steps: building an optimization model, and converting the design of the coating into the mathematical solution of the model; the optimal solution of the designed coating is obtained by coupling the genetic algorithm with COMSOL solution software; and preparing the coating according to the optimal solution of the designed coating. Through smooth transition of the dielectric constant, sudden change of the dielectric constant at a window-ceramic interface is fundamentally eliminated, so that electric field distribution tends to be uniform, generation of partial discharge and surface flashover is effectively inhibited, and the insulating strength of the windowing arc extinguish chamber is reliably recovered.

A bellows protector for a vacuum interrupter with an external bellows for low, medium or high voltages has a first region, which is configured tapered and to receive a moving contact rod such that the moving contact rod is guided out of the bellows protector from an inner side of the bellows protector onto a second side outside the bellows protector. The tapered first region of the bellows protector is configured to lie against the moving contact rod such that the moving contact rod is guided through the bellows protector. A second region adjoins the first region, the second region is enlarged relative to the first region such that the bellows to be protected is received in the second region. A holding region is configured to fasten the bellows protector on or to the vacuum interrupter such that the bellows protector forms a guide for the moving contact rod.

The invention discloses a deep fusion solid-sealed polar pole based on traveling wave distance measurement, and belongs to the technical field of automation control, the solid-sealed polar pole comprises a shell, a vacuum arc-extinguishing chamber, a current sensor, an insulation pull rod, a voltage sensor and an outgoing line conducting rod, the upper side of the interior of the shell is provided with the vacuum arc-extinguishing chamber, and the upper side of the interior of the shell is provided with the current sensor; the output end of the vacuum arc-extinguishing chamber is connected with an outgoing conducting rod and an insulating pull rod; the outgoing conducting rod is transversely arranged in the shell; the outer side of the outgoing line conducting rod is sleeved with a current sensor, and a voltage sensor is arranged on the side, corresponding to the insulating pull rod, in the shell. The vacuum arc-extinguishing chamber, the current sensor, the voltage sensor and the outgoing conducting rod are integrally packaged in the shell, so that the structure is concentrated, the occupied area is reduced, and the structure is simplified; and high-frequency and high-precision current and voltage detection is synchronously carried out through cooperation of the current sensor and the voltage sensor, so that the full-band requirement is met, and the detection precision is improved.

This invention discloses a mechanical force decomposition type dual-axis energy-saving dual-power rapid transfer switch, including a base, a first power vacuum interrupter, a second power vacuum interrupter, and an output copper busbar; the first and second power vacuum interrupters are respectively located on both sides of the base, and there are N of each, where N is an integer greater than or equal to N; the input terminals of the first and second power vacuum interrupters are respectively connected to the input copper busbars located on the base; the beneficial effect is that this application adopts a dual-axis rotation structure, and the contact opening and closing actions of the two power supplies are controlled by independent transmission shafts, which completely avoids the adverse effects of adjusting the contact pressure at one end on the other end in the traditional single-axis seesaw structure.

The application discloses a phase selector switch, which has multiple phases, each phase comprising a vacuum interrupter, a magnetic control mechanism and a transmission mechanism, the vacuum interrupter comprising a moving contact and a stationary contact, the magnetic control mechanism comprising a moving iron core and a stationary iron core, and the transmission mechanism comprising a connecting rod assembly, a breaking spring and an overtravel spring; the first end of the connecting rod assembly is rigidly connected to the moving contact, the second end of the connecting rod assembly is connected to the moving iron core in a follow-up mode, and the second end of the connecting rod assembly passes through the stationary iron core and the moving iron core, and the breaking spring and the overtravel spring are arranged in the middle section of the connecting rod assembly. The application has the beneficial effect that the connecting rod assembly passes through the magnetic control mechanism, so that an overtravel distance is formed between the connecting rod assembly and the magnetic control mechanism, and the overtravel value of the contact overtravel spring after the factory delivery can be observed and measured, and the wear condition of the vacuum interrupter contact in the phase selector switch can be found in time in the later period.

The utility model relates to a kind of integrated vacuum arc-extinguishing chamber installation support module, including integrally-formed mounting bracket and insulating cylinder, vacuum arc-extinguishing chamber is installed in insulating cylinder;Insulating cylinder has three in total, it is in the form of a word distribution on mounting bracket, the bottom end of insulating cylinder is also provided with center conductor, and center conductor and insulating cylinder integrally cast molding;The mounting bracket includes a mouth word outer frame, several transverse and longitudinal staggered distribution inner ribs are distributed in outer frame, three through holes for insulating cylinder plug-in installation are provided on mounting bracket, the two sides of the long axis direction of outer frame are also provided with brass inserts and isolation plate, four insulating support plates distributed along the long axis direction are also provided on outer frame.The support module in the utility model, three-phase vacuum arc-extinguishing chamber is assembled in insulating cylinder and fixed, live conductor can be isolated in insulating cylinder, improve insulation performance, also can realize the compact design of product, and the pouring strength of overall integrated structure design is good, assembly is simple.

The invention relates to the technical field of circuit breakers, and discloses a three-station miniature circuit breaker which comprises a support, one side of the support is fixedly connected with a main box body, the outer side of the main box body is provided with a switching-on and switching-off button, the top of the main box body is fixedly connected with a limiting frame, a twisting rod is arranged in the limiting frame, and the twisting rod is fixedly connected with the main box body. A plurality of upper transmission arms are arranged on the outer side of the twisting rod, three vacuum arc-extinguishing chambers are arranged in front of the support, and fuses are fixedly connected to the outer sides of the vacuum arc-extinguishing chambers. According to the invention, the opening operation shaft is in running fit with the swing part to work, the swing part slides along the top end of the ball body during rotation, the ball body is gradually inserted into the swing part and is located in the medium-length hole during rotation, and a click sound is formed, at the moment, an external worker understands that the operation is in place at the moment, and the closing is completed; the device has an automatic feedback function, guarantees that the device does not belong to a critical state and is completely in a safe isolation state, and improves the safety performance.

The invention discloses a plug-in fixed type annular solder for brazing of a vacuum arc-extinguishing chamber, and relates to the technical field of brazing of vacuum arc-extinguishing chambers. The head end of the arc-shaped welding flux in the radian direction is provided with an inserting male head, and the tail end of the arc-shaped welding flux in the radian direction is provided with an inserting female head. The multiple arc-shaped welding fluxes can be sequentially connected end to end in an inserted mode to define an annular welding flux structure, and the inserting male head of each arc-shaped welding flux is connected with the inserting female head of the adjacent arc-shaped welding flux in an inserted mode. According to the arc extinguish chamber, the annular welding flux can be constructed in the mode that the multiple arc-shaped welding fluxes are spliced in an inserted mode, the forming roundness and precision are improved, the forming difficulty is reduced, then the assembling efficiency and the consistency of the welding seam strength and the air tightness after welding are improved, and the coaxiality quality after the arc extinguish chamber is assembled is improved.

The utility model discloses a vacuum switch tube positioning welding assembly die, which relates to the technical field of assembly dies and comprises a supporting bottom plate, an upper supporting plate is fixedly connected onto the supporting bottom plate, the top of the upper supporting plate is connected with the fixed end of a first telescopic rod, and the telescopic end of the first telescopic rod is connected with a lifting plate. The lower part of the lifting plate is in threaded connection with an upper auxiliary mounting block; the side face of the supporting bottom plate is connected with the fixed end of a second telescopic rod, the telescopic end of the second telescopic rod is connected with a centering clamping assembly, two symmetrical clamping arms are arranged above the centering clamping assembly, and clamping jaws are further fixedly connected to the clamping arms. By arranging the centering clamping assembly, the two symmetrical clamping arms are pulled by the centering clamping assembly to synchronously slide towards the middle, so that the vacuum switch tube is centered.