27results about How to "Reduce installation risk" patented technology

The invention discloses a high-altitude warning device convenient to disassemble and assemble and a disassembling and assembling method, and belongs to the technical field of high-altitude warning lamps. The high-altitude warning device comprises a control box and a lampshade, and the control box is installed above the lampshade; the support frame is mounted on the control box; the quick clamping mechanism is installed above the supporting frame, the quick clamping mechanism is used for automatically clamping the power transmission line when the control box gets close to the power transmission line, the quick clamping mechanism comprises a mounting frame, the mounting frame is arranged above the supporting frame, and rotating shafts are installed at the left end and the right end of the inner wall of the mounting frame; and one group of rotating shafts is sleeved with a first clamping plate. When the warning device gets close to the power transmission line, the quick clamping mechanism is triggered to automatically clamp the power transmission line, installation personnel do not need to make direct contact with the high-voltage line, the installation difficulty and risk are greatly reduced, installation is assisted by using a telescopic rod or an unmanned aerial vehicle, the installation convenience and efficiency are further improved, and the installation efficiency is improved. The device is especially suitable for high-altitude operation environments.

The utility model discloses a frame combined type magnetic board which comprises a base, a square rod is arranged on the upper surface of the base, a square pipe is arranged on the top of the square rod in a sleeved mode, a transverse plate is fixedly installed on the top of the square pipe, a positioning plate and a positioning rod are arranged on the top of the transverse plate in an inserted mode, and one side of the positioning plate is fixedly connected with one side of the positioning rod. Limiting grooves are formed in the sides, opposite to the positioning rods, of the positioning plates, magnetic suction plates are fixedly installed on one sides of the positioning plates, magnetic suction vertical plates are inserted into the limiting grooves, threaded rods are inserted into the back faces of the transverse plates, and one ends of the threaded rods penetrate through the transverse plates and extend into the transverse plates. Through the arrangement of the transverse plate, the positioning plate and the positioning rod, the magnetic suction vertical plate can be preliminarily limited in cooperation with the magnetic suction plate in the use process, so that the magnetic suction vertical plate is prevented from shaking in the subsequent mounting and positioning process, the overall mounting stability of the board is kept, and subsequent normal use is facilitated while the mounting risk is reduced.

This application provides a tension control method, relating to the field of riser tension control technology. The method includes: acquiring sensor data; extracting characteristic parameters corresponding to the riser based on the sensor data; updating the digital twin model corresponding to the riser based on the sensor data; obtaining the riser prediction result of the updated digital twin model; constructing a cost function based on the riser prediction result, characteristic parameters, and sensor data; and controlling the tension control module to perform tension control on the riser based on the solution result of the cost function. The solution result includes control parameters for the top tensioning unit, segmented buoyancy unit, internal pressure adjustment unit, and tension fine-tuning bypass. The embodiments of this application can dynamically adjust the riser tension control strategy based on real-time sensor data, effectively avoiding the need to increase the riser diameter and maintain high top tension, reducing manufacturing costs and installation risks, and effectively reducing energy loss and improving peak shaving capability.

The invention relates to the technical field of house building engineering, in particular to a quick connecting and positioning device for prefabricated parts for house building engineering, which comprises a floor slab surface, pile foundations fixedly mounted at corners of the floor slab surface, embedded ribs fixedly mounted on the pile foundations, two groups of upright posts fixedly mounted on the floor slab surface, and fixed-length components arranged on side surfaces of the upright posts. The fixed-length assembly comprises a curved bar and a threaded sleeve, a threaded rod is connected into the threaded sleeve in a screwed mode through threads, and a positioning rod is arranged at the joint of the fork-shaped connector and the connecting lug. The threaded sleeve is rotated to drive the threaded rod to extend, so that the stand column is matched with the section size of the precast beam, and the edge of the precast beam is positioned through the positioning rod; the fork-shaped joints and the connecting lugs of the two groups of fixed-length assemblies are crossed and rotated to form right angles through the positioning rods, the precast beam is lowered to a proper height during hoisting, and a worker uses a tool to align the right-angle edge of the precast beam with the joints of the fixed-length assemblies and then falls down, so that the installation risk is reduced, and the positioning time is shortened.

The utility model relates to the technical field of chemical equipment manufacturing technique discloses a storage pipe for phenol oil production, including pipe body, pipe cover, connecting pipe, feed tank, the surface fixed connection of pipe body has the pipe cover, the surface fixed connection of pipe body has the connecting pipe, the surface fixed connection of pipe body has the feed tank, the surface of connecting pipe is equipped with clamping structure, and the clamping structure includes connecting plate, the surface of connecting plate is equipped with the sliding slot, the inner wall sliding connection of sliding slot has the clamping plate, the inner wall rotation is connected with the two -way screw rod of sliding slot, the surface screw connection of two -way screw rod's arc surface and clamping plate, one end fixed connection of two -way screw rod has the rotation plate, the surface rotation of rotation plate is connected with screw rod, and one end screw connection of screw rod and connecting plate's surface.

The invention relates to a marine detachable main engine middle bearing engine base and an installation method, the marine detachable main engine middle bearing engine base comprises an upper half engine base and a lower half engine base, the upper half engine base and the lower half engine base are connected through bolts, a gasket is arranged on the lower half engine base, a plurality of stop blocks are arranged on the top surface of the lower half engine base, and the upper half engine base is enclosed through the stop blocks. The mode that the shaft generator and the main shaft are hung in synchronously is not adopted, and the shaft generator and the main shaft move from back to front. Only one piece of equipment is hoisted every time instead of synchronous hoisting of two pieces of equipment, the precision is easy to control, and the installation risk is greatly reduced. In addition, when the shaft needs to be disassembled in the ship operation process, the generator and the main shaft do not need to be hoisted out synchronously, and the upper half base is disassembled, then hoisting work is carried out, and then the upper half base is installed.

The utility model provides a kind of flexible connection PIN needle and assembly combination structure, it is related to semiconductor connecting piece technical field.The bending deformation design of buffer section in the flexible connection PIN needle in the present application can realize needle body absorbing assembly prestress and vibration stress in the direction of PCB and power module connection during assembly process, reduce installation stress and fatigue failure risk, and further guarantee the stability of its connection;The aperture of the inlet of the guide channel in the guider in the assembly combination structure in the present application is greater than the aperture of the interface, compared with the conventional way of directly inserting into the socket of PCB, it ensures that the interface range inserted during the assembly process of insertion section is larger, allows PIN needle and PCB aperture to have larger initial position tolerance during assembly process, reduces assembly difficulty, avoids damage of parts caused by hard contact, and at the same time, support seat and positioning section are arranged to cooperate positioning, ensure the assembly position stability of PIN needle body and provide stable support, improve the stability of assembly and connection.

The utility model relates to the technical field of building controllers, and discloses a building energy-saving controller convenient to install, which comprises an installation plate, a controller is clamped on one side of the installation plate, a baffle plate used for limiting is fixedly installed on the top of the controller, an additional plate used for matching is arranged on one side of the controller, and the additional plate is fixedly installed on the top of the controller. The top of the controller is fixedly connected with a handle used for facilitating lifting, and one side of the additional plate is fixedly connected with an alarm used for alarming. According to the building energy-saving controller convenient to install, through cooperative arrangement of the controller, the installation plate and the baffle, the device can be conveniently installed during use, the installation process is simpler, more convenient and faster, the installation time is remarkably shortened, the working efficiency is improved, meanwhile, due to the characteristic that the device is convenient to install, a worker only needs to conduct installation according to simple installation steps, and the installation efficiency is improved. And error operation and installation risks are reduced, and the installation safety is improved.

The utility model belongs to the field of constructional engineering, and discloses an ALC partition board auxiliary installation device which comprises a movable supporting frame body, a winding device and a pulley, the winding device and the pulley are arranged on the supporting frame body, and a lifting rope of the winding device winds around the pulley to pull up one end of an ALC partition board; the supporting frame body is further provided with a pull rope assembly, and the other end of the ALC partition board is pulled up through a pull rope on the pull rope assembly. The pull rope assembly comprises bearing seats arranged on the two sides of the supporting frame body, a roller rotationally installed on the bearing seats and provided with a pull rope, a handle arranged on a connecting shaft at one end of the roller and a non-return assembly arranged on the connecting shaft. The pull rope assembly is arranged on the supporting frame body, the other end of the ALC partition wall board is pulled up through the pull rope on the pull rope assembly, the pull rope assembly is matched with the winch assembly to hoist the ALC partition wall board, the problem that the ALC partition wall board shakes too much during hoisting is solved, the ALC partition wall board does not need to be jacked manually, the installation risk is reduced, and the installation efficiency is improved. And the damage caused by collision due to excessive shaking of the ALC partition board is avoided.

An enhanced heat dissipation, low-loss, high-speed permanent magnet motor rotor structure comprises a solid shaft body, permanent magnets, and a carbon fiber protective sleeve. The solid shaft has spaced-apart rotor cooling rings and rotor dynamic balancing rings; the permanent magnets are mounted on the solid shaft body; the carbon fiber protective sleeve is assembled using a high-tension winding method; the permanent magnets have an unequal thickness structure, with their thickness distributed sinusoidally, and their outer surface is circular. In the rotor structure, the rotor cooling rings and rotor dynamic balancing rings are in direct contact with the cooling fluid in the air gap and the unequal-thickness permanent magnets, enabling the heat from the permanent magnets to be conducted to the cooling fluid through heat conduction and convection. Furthermore, the unequal-thickness permanent magnets improve the sinusoidal magnetic flux density of the air gap, effectively suppressing rotor eddy current losses. The combination of rotor loss suppression measures and high-efficiency rotor cooling technology achieves efficient thermal management of the high-speed permanent magnet motor rotor from both loss suppression and cooling perspectives.

The utility model relates to the technical field of open caisson construction, and provides an open caisson internal supporting operation platform which comprises an open caisson wall. The horizontal pre-buried casing pipe is mounted in the open caisson wall body; the inclined pre-embedded sleeve is mounted in the open caisson wall body and is positioned below the horizontal pre-embedded sleeve; the horizontal supporting rod is inserted into the horizontal embedded sleeve, and a movable groove is formed in the top of the horizontal supporting rod. The horizontal supporting rods are inserted into the horizontal pre-embedded sleeves, the inclined supporting rods are inserted into the inclined pre-embedded sleeves, meanwhile, the inclined supporting rods and the horizontal supporting rods are connected, so that the stress performance of the horizontal supporting rods is guaranteed, and then the scaffold boards are erected, so that the operation platform can be erected and installed; therefore, the effect of rapidly erecting and installing the operation platform is achieved, the operation process is simple and rapid, the installation risk is conveniently reduced, and the installation safety of the operation platform and the construction efficiency of the open caisson are effectively improved.

The utility model belongs to the technical field of sliding table saws, and particularly relates to a saw blade replacing mechanism for a sliding table saw, which comprises a pre-inserting seat, a saw blade body, a pushing cover and an eccentric lock handle piece, the eccentric lock handle piece is provided with a tensioning assembly attached to the pre-inserting seat, the pushing cover is arranged on the tensioning assembly, and the saw blade body is arranged on the pushing cover. The saw blade is tightly pressed on the pre-insertion seat through the eccentric lock handle piece, and the pre-insertion seat is provided with a limiting assembly used for restraining springback of the eccentric lock handle piece. According to the utility model, the pre-insertion seat is matched with the tensioning assembly and the eccentric lock handle piece, so that the mechanism can improve and optimize the replacement operation of the saw blade, and the saw blade can be assembled and fixed in advance. And during replacement, the eccentric lock handle piece can be clamped or released only by operating the eccentric lock handle piece, so that the mounting efficiency and convenience are improved, and the mounting risk is reduced.

The invention belongs to the technical field of steel structure monitoring, and particularly relates to a rail detection device and method for a ship unloader large arm box girder, and the device comprises a device main body which is integrated with a detection sensor and a processing unit, and further comprises a rail system which is arranged in a box girder and spans a rib partition plate, and comprises a bearing frame and a rail body, the bottom of the track body is connected to the bearing frame, and the bottom of the bearing frame is connected with a horizontal wing of the L-shaped quick release structure. The L-shaped quick release structure comprises two L-shaped adapter plates, and each L-shaped adapter plate is composed of a horizontal wing and a vertical wing; the two L-shaped adapter plates are arranged on the two sides of the rib partition plate in the mode that the vertical wings are opposite. The vertical wings and the rib partition plates which are oppositely arranged are clamped and fixed, and rapid connection between the track system and the box girder rib partition plates is achieved. A modular rib-crossing track system is formed, and non-blind-area and high-precision scanning of a key structure below is achieved.

The invention belongs to the field of chemical production equipment, and particularly relates to a liquid closed feeding device and a feeding method. The liquid closed feeding device comprises a pressure control part and a feeding part, the pressure control part comprises a first three-way pipe provided with a valve and a pressure gauge, and the feeding part comprises a second three-way pipe provided with a valve, a third three-way pipe provided with a valve and a fourth three-way pipe provided with a valve; the first three-way pipe comprises a first pipeline, a second pipeline and a third pipeline, a first valve and a pressure gauge are arranged on the first pipeline, and a second valve is arranged on the third pipeline; the second three-way pipe comprises a fourth pipeline, a fifth pipeline and a sixth pipeline, a third valve is arranged on the fifth pipeline, and a fourth valve is arranged on the sixth pipeline; the third three-way pipe comprises a seventh pipeline, an eighth pipeline and a ninth pipeline, the fourth pipeline is communicated with the eighth pipeline, and a fifth valve is arranged on the pipeline for communicating the fourth pipeline with the eighth pipeline; and one pipeline of the fourth three-way pipe is communicated with the seventh pipeline, and the other two pipelines of the fourth three-way pipe are respectively provided with a sixth valve and a seventh valve.

The present application relates to the technical field of box type integrated cold source station, and particularly relates to a box type integrated cold source station convenient for equipment maintenance, which comprises a steel frame and a supporting vertical pole which enclose a space frame body, and a packaging plate and a side door which are installed around the space frame body to complete packaging, and further comprises: a special-shaped sliding rail which comprises two U-shaped clamping plates connected through a bottom plate and having opening ends outward, and a I-shaped rail installed on the inner side of the U-shaped clamping plate; a moving holding part which comprises a moving unit symmetrically installed on the corresponding side I-shaped rail, and a supporting base installed on the top of the two moving units; a locking assembly is installed on one side of the supporting base, and a limiting stop plate is arranged on the other side, and a fastening bolt is threadedly installed on the limiting stop plate; the electric locking assembly and the manual fastening bolt double locking structure are creatively designed, the wedge self-locking effect of the pressing plate locking unit is matched, the special-shaped sliding rail can be firmly positioned, and the reliability of long-term operation and structural locking positioning of the equipment is improved.

The utility model relates to the technical field of submarine cables, in particular to a submarine cable rear protection device which comprises a plurality of protection sleeves. The protective sleeve comprises a first connecting part and a second connecting part, the first end of the first connecting part is hinged to the first end of the second connecting part, a connecting structure is arranged between the first connecting part and the second connecting part, and the second end of the first connecting part is connected with the second end of the second connecting part through the connecting structure. A clamping structure is arranged between every two adjacent protective sleeves, and the adjacent protective sleeves are connected in a clamping mode through the clamping structures. The submarine cable rear protection device provided by the utility model is used for solving the defects that the existing rear protection device is relatively high in installation difficulty and the submarine cable is easy to damage in the installation process, the installation process of the rear protection device is simplified, and the damage risk of the submarine cable in the installation process can be reduced.

The utility model discloses a sound barrier belongs to road sound barrier technical field. The sound barrier, including the foundation assembly that is buried below ground, the upper portion of foundation assembly is equipped with the connecting assembly, installs the barrier assembly on connecting assembly, barrier assembly includes foamed aluminum barrier screen body and draw -in groove, the bottom of foamed aluminum barrier screen body is equipped with two symmetrical distribution's draw -in groove, and the adjacent two foamed aluminum barrier screen body are connected through connecting assembly. Sound barrier takes foamed aluminum body as the core material, and its porous structure can effectively absorb medium high frequency sound wave, thereby reducing the noise, and foamed aluminum barrier screen body and stand between adopt the joint, and utilize the draw -in groove of upper portion and make foamed aluminum barrier screen body draw -in groove in the base, utilize the ribbed plate at the back and make the stand of both sides joint, thereby increase the stability between adjacent two stands, make foamed aluminum barrier screen body's connection more stable.

The invention relates to the technical field of ocean engineering corrosion prevention, in particular to a remote sacrificial anode component and a sinking installation method thereof.The remote sacrificial anode component is simple in structure and convenient to prefabricate, integration of multiple anode blocks on a steel frame structural component can be achieved, a structural foundation is provided for underwater stable arrangement of the anode blocks, and the construction cost is reduced. Laying and limiting of the anode cable are assisted through the sinking assisting component, a structural foundation is provided for underwater stable laying of the anode cable, sinking installation and underwater position stabilization of the remote sacrificial anode component and underwater laying and limiting of the anode cable can avoid manual diving operation, the installation efficiency is improved, and the construction cost is reduced. The installation cost and the installation risk are reduced; according to the sinking installation method for the remote sacrificial anode, the diving operation process in the underwater installation process of the remote sacrificial anode is completely avoided, the installation efficiency of the remote sacrificial anode component is improved, and the installation risk and the installation cost are reduced.

The utility model relates to a hoop installation safety platform. The hoop installation safety platform comprises an annular supporting platform and guardrails vertically arranged on the periphery of the annular supporting platform. The shape of the opening is matched with that of the installed hoop, and the area of the opening is larger than the sectional area of the installed hoop. The annular supporting platform is composed of a steel plate and angle steel welded to the bottom face of the steel plate, and the guardrails are formed by welding channel steel serving as vertical rods and angle steel serving as transverse rods. The lower ends of the vertical rods are fixedly welded to the annular supporting platform, and skirting boards are arranged on the guardrails. The hoop installation safety platform further comprises a rubber buffer strip or a rubber buffer ring surrounding the edge of the opening. When the hoop is used for installing the safety platform, the hoop installation efficiency can be greatly improved, and the installation risk is reduced.

This utility model relates to the field of air conditioning pipe technology, and proposes a data center backplane air conditioning pipe, including: multiple pipes; connecting blocks and fixing blocks disposed on the outer wall of the pipes, wherein the fixing blocks have threaded grooves inside, and the outer wall of the connecting blocks is fixedly provided with threaded rings, the threaded rings being threadedly connected to the threaded grooves; and fixing edges are provided on both sides of the pipes. The use of connecting blocks and fixing blocks enables waterless and fire-free rapid installation and maintenance, improves installation efficiency, reduces installation risks and pollution caused by welding, and avoids phenomena such as pipe weld failure. The composite pipe design improves the pipe's pressure resistance and shock resistance, and the microchannel design, by generating eddies in the refrigerant during flow, disrupts the laminar flow state of the liquid film, thus enhancing the boiling and condensation heat exchange processes.

The present invention relates to the technical field of generator outlet circuit breakers, and specifically discloses an auxiliary installation device for generator outlet circuit breakers and a method for using the device. The device includes a support beam, a steel plate, a longitudinal beam and a cross beam, wherein a plurality of the support beams are interconnected by a plurality of the longitudinal beams and cross beams to form a platform frame structure on which the steel plate is fixed, and the platform frame can support the weight of the generator outlet circuit breaker to be removed or installed; two mutually parallel ground guide rails are provided on the steel plate, and the center width of the two ground guide rails matches the center width of the circuit breaker legs, and a hand winch traction point is provided at one end of the platform frame structure. The present invention can reduce the risk of equipment installation, improve maintenance efficiency, and at the same time avoid the hidden danger of suspended oblique pulling during the installation of the generator outlet circuit breaker, thereby ensuring the smooth implementation of the replacement of the generator outlet circuit breaker.

The invention belongs to the technical field of airplane strength design, and particularly relates to a length-adjustable steel wire rope hoisting structure which comprises a first pulley assembly, a second pulley assembly, a third pulley assembly and a steel wire rope. Wherein the first pulley assembly is provided with a first joint and a roller, the second pulley assembly is provided with a second joint and a roller, and the third pulley assembly is provided with a third joint and a roller; one end of the steel wire rope is fixed on the first joint, sequentially wound on the second pulley assembly, the first pulley assembly and the third pulley assembly and then fixed on the second joint; wherein the first connector is connected with a hoisting device, the third connector is connected with a hoisted device, the design of a length-adjustable hoisting structure is realized by adopting a structure that a pulley is matched with a steel wire rope, the weight of the hoisting structure is reduced, the mounting risk is reduced, and the working efficiency of length adjustment is improved.

The application provides a large-span horizontal load-bearing safety device based on a cantilever layer type steel and a construction method, and relates to the technical field of building construction. The large-span horizontal load-bearing safety device is installed on the type steel and is used for freely arranging and recycling a safety flat net in a structure plane. The guide rail is configured to move horizontally in parallel with the type steel. The transmission assembly is used for pushing the guide rail to realize horizontal movement. The connecting assembly is used for forming self-locking with the guide rail to lock the movement position of the guide rail. The first hook assembly is used for driving the safety flat net to move horizontally or stop moving. The second hook assembly is used for realizing the height difference between the inside and outside of the safety flat net. The wedge of the connecting assembly is used for fixing the guide rail, so that the installation is facilitated. The guide rail can be used for remotely controlling the installation of the installer, so that the installation risk is reduced. The first hook assembly can be used for quickly unfolding and recycling the safety flat net, so that the engineering efficiency is improved and the engineering risk is reduced.

The invention relates to the technical field of nuclear power plant skill training, in particular to an installation method of an IGA operation skill training simulator. The method comprises the following steps: assembling a bottom bearing bracket of an operation platform at an open position of a hall of a first floor of a simulated pool, and hoisting to a middle platform; erecting a scaffold platform around the simulated pool; carrying out spot welding on a bearing bracket steel base plate and a simulated pool middle platform steel covering surface; the upper reactor internals simulation body and the IGA assembly simulation body are integrally assembled and hoisted to a middle platform; leveling the upper reactor internals simulation body; assembling a second-layer platform of the operation platform; hoisting a lower support ring of the reactor internal lifting appliance simulation body to an upper reactor internal simulation body by using a crane; splicing the reactor internals on the first floor; scattered parts and the like are installed; assembling an IGA lifting appliance; and installing a guide extension column operation tool. The installation efficiency is high, the installation risk of overall operation is minimum, and the controllable requirement is met.

The invention relates to the technical field of robots, in particular to an encoder device of a joint actuator, the robot joint actuator and a robot. The joint actuator specifically comprises a joint actuator stator, a joint actuator rotor and an encoder device, the joint actuator rotor comprises a motor rotor and a speed reducer rotor, the encoder device comprises a first encoder, an encoder rotor of the first encoder is connected with the motor rotor, and a first position relation exists between an encoder rotor of a second encoder and the stator; an encoder rotor of the second encoder is connected with the motor rotor, and an encoder stator of the second encoder is connected with the speed reducer rotor; or the encoder rotor of the second encoder is connected with the speed reducer rotor, the encoder stator of the second encoder is connected with the motor rotor, and a second position relation exists between the encoder rotor and the stator of the second encoder, so that the integration level of the joint actuator is improved, and the cost of the joint actuator is reduced.

The invention belongs to a positioning device, and particularly relates to a device for preparing a positioning key pin hole in the inner wall of a container. The device comprises a bottom plate, a connecting plate is arranged on the bottom plate, the bottom plate and the connecting plate form a T-shaped structure, a fixing mechanism is arranged on the connecting plate, and an anti-sliding mechanism and an adjusting mechanism are arranged on the side, opposite to the connecting plate, of the bottom plate. The magnetic drill has the remarkable effects that (1) the magnetic drill has the characteristics of high drilling precision, small size and large adsorption force; the fixing device is made of Q235B steel, materials are common and easy to purchase, the structure is simple, manufacturing is easy, and the manufacturing cost of the drilling tool is reduced; (3) the fixing device is combined with the actual site situation, bolt connection is utilized, the mounting frame is simple in structure, efficient, reliable, high in stability and convenient to operate, the auxiliary time is shortened, and the production efficiency is greatly improved; (4) the fixing device is made of Q235B steel, has enough strength and rigidity, and is simple and convenient to operate, labor-saving and safe to use; and (5) the fixing device is simple to assemble and easy to disassemble and assemble.

The invention discloses a portable inductance-adjusting capacitance-adjusting resonant AC voltage-withstanding test device, and aims to solve the problems of large equipment size, heavy weight, high cost, difficulty in assembly and high installation risk in the prior art. The resonant frequency of the device is adjusted in a capacitor + inductor adjusting mode, so that the whole device only needs to use one inductance adjusting reactor, the adjusting difficulty is reduced, and the weight, size and cost of the device are reduced; meanwhile, detachable reactor hoisting equipment is matched, so that the mounting risk can be reduced while the mounting convenience and efficiency are improved; besides, the series-connected reactors are arranged on the fixing mechanism which is vertically fixed on the base in a sleeving manner, so that the series-connected reactors can be prevented from toppling over, the mounting height can be reduced, and the assembly safety is improved; therefore, the power frequency alternating current withstand voltage test and the variable frequency alternating current withstand voltage test can be realized by using relatively small equipment and relatively low cost.