60results about How to "Improve maintenance safety" patented technology

The invention relates to a pebble-bed module type high-temperature gas cooled reactor fuel loading and unloading system which comprises a reactor (10), a reactor core fuel circulating system (20), a new fuel loading system (300) and a spent fuel unloading system (400). The reactor (10) comprises a reactor pressure container (11), a graphite coating reactor internal component (12), a central reactor core cylinder (13), a metal reactor internal component (15) and an unloading pipe (14), the reactor core fuel circulating system (20) comprises a reactor core unloading system (100) and a reactor core loading system (200) and further comprises a helium pneumatic conveying system (500), a compressed air pneumatic conveying system (600), a vacuum pumping system (700) and a helium supplying and recycling system (800), and the compressed air pneumatic conveying system (600), the vacuum pumping system (700) and the helium supplying and recycling system (800) are all connected with the helium pneumatic conveying system (500). The helium pneumatic conveying system (500) is further respectively connected with the reactor (10), the reactor core fuel circulating system (20), the new fuel loading system (300) and the spent fuel unloading system (400).

The invention relates to an open winding motor system and a drive circuit and belongs to the technical field of opening winding motor control. Redundant bridge arms and redundant inductors are set inthe drive circuit. When an open circuit fault occurs in certain phase of winding or certain bridge arm, the fault winding or bridge arm stops working, the redundant inductors and the redundant bridgearms are put into operation, and fault-tolerant control is realized. Even under fault condition, a connection method of motor windings is not limited, and a switching drive signal originally sent to the fault bridge arm is forwarded to the redundant bridge arms, so the control is simple, secure and reliable. Even if the fault occurs in certain phase, the circuit still can be operated normally, normal drive is realized, and reliability of an inverter circuit is improved.

The invention provides an energy storage system, and the energy storage system comprises at least one energy storage unit cluster and a centralized monitoring system of the energy storage unit cluster, wherein the energy storage unit cluster is formed by connecting at least two energy storage modules in series; one energy storage module comprises an energy storage element group and a switch bridge arm, the switch bridge arm is composed of a master control switch and a bypass switch, one end of the master control switch is connected with the energy storage element group, the other end of the master control switch serves as a first input / output end of the energy storage module, one end of the bypass switch is connected with the first input / output end, and the other end of the bypass switch is connected with the second input / output end of the energy storage module; the energy storage unit cluster is coupled to the direct current bus through the DC / DC converter; and the centralized monitoring system is connected with the energy storage unit cluster through a control bus and is used for controlling the on or off of the main control switch and the bypass switch in any energy storage module in the energy storage unit cluster. According to the invention, the management flexibility of the energy storage system can be improved, the stability of the energy storage system is improved, and the applicability is higher.

The invention discloses a utility tunnel, and belongs to the field of municipal infrastructure construction. The utility tunnel comprises a tunnel body which is internally provided with a partition plate, and the lower surface of the partition plate and the tunnel body form a sewage disposal area. The utility tunnel is characterized in that the partition plate is provided with a water treatment device and a water storage box; the water treatment device comprises a silt separator and a water treatment machine; the silt separator is connected with the water treatment machine through a first clear water pipe; the water treatment machine is connected with the water storage box through a second clear water pipe; a water outlet pipe penetrating out of the tunnel body is connected to the water storage box; the tunnel body is further internally provided with a protection box; the water treatment machine is located in the protection box; a shockproof base is arranged on the partition plate and provided with a groove body; a foam plate is embedded in the groove body; and the protection box is fixed to the foam plate. According to the utility tunnel, the inner space of the tunnel body is reasonably utilized, all the components are reasonably laid out, the water treatment machine is stable in operation and good in shockproof performance, and good converting of sewage and rainwater can be effectively ensured.

A high-voltage device box comprises a box body, and a high-voltage grounding switch, a voltage transformer, a lightning arrester, a high-voltage isolation switch and a vacuum circuit breaker which arelocated in the box body. The interior of the box body is divided into a low-voltage area and a high-voltage area through a partition plate, the low-voltage part of the high-voltage isolation switch and the low-voltage part of the vacuum circuit breaker are both installed in the low-voltage area, and the high-voltage grounding switch and the high-voltage part of the vacuum circuit breaker are bothinstalled at the side, located in the high-voltage area, of the partition plate. The high-voltage part of the high-voltage isolation switch is installed on the bottom face of the high-voltage area through a supporting insulator, and the voltage transformer and the lightning arrester are installed on the two opposite side walls of the high-voltage area respectively. An overhaul cover plate is arranged at the upper portion of the low-voltage area, and a main top cover is arranged at the upper portion of the high-voltage area. According to the high-voltage device box, the maintenance of the high-voltage device is facilitated after the high-voltage and low-voltage partitioning, and the high-voltage device adopts a mode of combining the side wall installation and the bottom surface installation, so that the overall size of the high-voltage device box can be reduced.

The invention relates to a 5G communication iron tower with high maintenance safety. The 5G communication iron tower comprises a supporting rod, a supporting disc, an antenna and a ladder stand. The supporting rod is vertically arranged, and the supporting disc and the supporting rod are coaxially arranged. The diameter of the supporting disc is larger than that of the supporting rod, and the supporting disc is fixed to the top end of the supporting rod. The antenna is arranged at the top of the supporting disc and right faces the supporting rod. A manhole is formed in the supporting disc, andthe axis of the manhole is parallel to the supporting rod. A protection mechanism and a snow removing mechanism are arranged on the supporting disc, the protection mechanism comprises protection pipes, a sealing assembly and at least two movable assemblies, and the snow removing mechanism comprises at least two snow removing assemblies. The snow removing assemblies are arranged in the protection pipes and are in one-to-one correspondence with the movable assemblies. The 5G communication iron tower with high maintenance safety achieves the function of improving the maintenance safety throughthe protection mechanism, and not only that, the function of removing snow is achieved through the snow removing mechanisms.

The invention discloses a photovoltaic energy-saving electrical control cabinet, and belongs to the technical field of electrical control cabinets. According to the control cabinet, photovoltaic panels electrically connected with a storage battery are arranged on the two sides of a triangular top cover at the top end of a cabinet body, light energy can be converted into electric energy and stored,emergency lighting is provided for emergency repair, and a power source can be provided for independent equipment in the electrical cabinet; in addition, a storage cavity is formed in the top end ofthe cabinet body 1, a protective cover plate capable of being drawn out is positioned on the inner side of the storage cavity, and two side cover plates which can be drawn out of the protective platerespectively and are located on the two sides of the protective cover plate after being unfolded are positioned in the protective cover plate, so that a rain shielding function can be provided when power maintenance personnel repair a circuit; workers can repair the circuit conveniently, and the maintenance safety is enhanced.

The invention discloses an overhaul watch board of a 35kV double-bus double-section wiring structure. The 35kV double-bus double-section wiring structure comprises a section I bus, a section II bus, asection III bus and a section IV bus, wherein a section I and III isolation cabinet and a section I and III switch cabinet are connected between the section I bus and the section III bus; a section II and IV isolation cabinet and a section II and IV switch cabinet are connected between the section II bus and the section IV bus; the section I and III isolation cabinet and the section I and III switch cabinet are positioned at one side of a vestibule; the section II and IV isolation cabinet and the section II and IV switch cabinet are positioned on the other side of the vestibule; and a circuitdiagram of the 35kV double-bus double-section wiring structure is shown on the overhaul watch board. The overhaul watch board has the advantages that the wiring structure of the system in the regioncan be clearly shown, so that overhaul and operation personnel can comprehensively master the wiring condition in the position, and know the charged dangerous source point positions and safety measurearrangement conditions; the operation and overhaul operation risk is reduced; the overhaul safety is improved; and the overhaul operation safety is ensured.

The invention relates to the technical field of lighting equipment, in particular to a street lamp with an automatically adjustable solar panel. A supporting plate, a rotating shaft, a lead screw anda transmission shaft are arranged in an inner cavity of a lamp pole. A sliding gear and a shifting fork are mounted on the transmission shaft, a motor is arranged on the inner wall of the lamp pole, the motor is in transmission connection with the transmission shaft through a pair of mutually meshed gears, a sliding groove is vertically formed in the outer wall of the lamp pole, a sliding block isarranged on the lead screw, the sliding block is embedded in the sliding groove in a sleeved mode, the sliding block is fixedly connected with a lamp holder, a bottom plate is arranged at the top ofthe rotating shaft, an adjusting mechanism is installed on the bottom plate, and a solar panel is arranged on the adjusting mechanism. The lamp holder is driven by the motor to move up and down, the height from the lamp holder to the ground can be adjusted, and the safety of maintenance operation is high; the direction and the angle of the solar panel can be flexibly adjusted through the lead screw and the adjusting mechanism, and the solar energy acquisition efficiency can be improved.

The invention discloses a spherical valve overhaul sealing control method which is characterized in that the spherical valve overhaul sealing control method comprises the following steps that a, the area of an opening cavity of a movable sealing ring in a spherical valve, the area of an upstream high pressure cavity, the area of an upstream input cavity and the area of a downstream pressure cavityare set; b, normal overhaul is carried out, a water turbine is shut down, a valve body of the spherical valve is fully closed through a servomotor, the movable sealing ring is put in, water in a downstream pipeline of the spherical valve is drained, and the movable sealing ring is pressed under the pressure of the upstream input cavity and the pressure of the upstream high pressure cavity; c, extreme overhaul is carried out, the upstream input cavity is subjected to pressure loss, the opening cavity is subjected to pressure buildup, and the movable sealing ring is pressed; and d, after the overhaul, a by-pass line is opened for carrying out pressure balance on the upstream side and the downstream side of the spherical valve. The free input and withdrawing of overhaul sealing in a normal overhaul state can be realized, the situation that the overhaul sealing is not opened during misoperation can be guaranteed, the safety of a maintainer is ensured, and the spherical valve overhaul sealing control method has the characteristics of convenience in operation, safety and reliability.

The invention relates to a turning tool, and discloses an automatic turning tool for a power generator collecting ring. The automatic turning tool for the power generator collecting ring comprises a workbench, a first sliding block is installed on the workbench, and a tool rest is installed on the first sliding block; the automatic turning tool for the power generator collecting ring further comprises a lead screw, and a first gear and a first chain wheel are installed at the outer end of the lead screw; a second sliding block is installed on the upper end face of the workbench, a first motoris fixed to the second sliding block, a second gear and a second chain wheel are installed on an output shaft of the first motor, and the first chain wheel and the second chain wheel are connected through a chain; and a first rotation shaft and a second rotation shaft are arranged at the two ends of the workbench, a third gear and a third chain wheel are fixed to the first rotation shaft, a fourthgear and a fourth chain wheel are fixed to the second rotation shaft, the first gear meshes with the third gear, the second gear meshes with the fourth gear, and the third chain wheel and the fourthchain wheel are connected through a chain. According to the automatic turning tool for the power generator collecting ring, the structure is simple, manufacturing is convenient and fast, the cost is low, dual driving is achieved, and the equipment stability is improved.

The invention relates to an intelligent safety type switch cabinet. The switch cabinet comprises a cabinet body, a cabinet door, a power supply socket, a wiring plug, a moving plate and a driving mechanism, the cabinet door is hinged to one side of the cabinet body in the vertical direction, and an electric appliance element is arranged in the cabinet body, is installed in the cabinet body and isconnected with the wiring plug through a power supply line. A moving plate is arranged at the bottom in the cabinet body and is in sliding connection with the cabinet body in the horizontal direction,the driving mechanism is connected with the moving plate, and the wiring plug is fixedly connected to the side, away from the cabinet door, of the moving plate and is matched with the power supply socket in an inserted mode. The switch cabinet has the effect of improving the operation safety of maintenance personnel during maintenance.

The invention discloses a novel electric power overhaul warning device which comprises a warning device, a ground joint, a locking block, a power box, a hinge, a base, a lockset, an inspection window,a box door, an upper cover, a flashing, a lightning rod, a rubber tube and a junction box, wherein the right end of the ground joint is welded with the left end of the warning device; a through holeis formed in the middle end of the locking block; the rear end of the locking block is fixedly connected with the bottom of the front end of the warning device; the bottom of the upper cover is weldedwith the top of the power box; the power box is of a hollow cuboid structure. According to the novel electric power overhaul warning device disclosed by the invention, the warning device is arrangedon the structure, the device is capable of realizing physical pressure alarm and voltage alarm, and when external impact force pressure is too large, parts inside the power box is likely to shift to cause potential safety hazards, and then the warning device gives warning in time; meanwhile, if the power box has electric leakage, the warning device is capable of alarming in time, and the maintenance safety of a maintainer is greatly improved.

The invention discloses LED lighting equipment based on solar power generation and relates to the technical field of LED lighting. The LED lighting equipment based on solar power generation comprises a base, a connecting mechanism and an adjusting mechanism, wherein a shell is fixedly installed at the top of the base, a stand column is fixedly installed at the top of the shell, a box body is fixedly installed at the top of the stand column, and a connecting rod is arranged at the top of the box body. According to the LED lighting equipment based on solar power generation, the orientation of the solar panel can be automatically adjusted according to illumination intensity when the equipment is used in the daytime, and compared with the situation that orientation of the solar panel is always located at one position angle and cannot be adjusted, the light energy absorption effect of the solar panel is enhanced; the situation that the LED lamp cannot illuminate due to insufficient electric quantity of the storage battery is reduced, the equipment tends to be more intelligent, the LED lamp can illuminate automatically in dark weather, illumination control is not needed, and the intelligent effect of the illumination equipment is further improved.

The invention provides a large low-temperature storage tank maintenance method which is reasonable in design, short in maintenance period and low in maintenance cost. The method comprises the following steps: (1) detecting a bottom plate of an inner tank; (2) detecting an inner tank wall plate; (3) detecting an outer tank bottom ring plate; (4) detecting the wall plate of the outer tank; (5) transforming a drain hole; (6) interlayer pearlife is removed; (7) tank wall elastic felt replacement; (8) ceiling glass wool replacement; (9) replacing a multi-point thermal resistor; (10) a servo liquid level meter is additionally arranged and used for measuring the liquid level of liquid; and (11) adding an average thermometer for measuring the temperature of the liquid.

The invention belongs to the aviation storage battery information acquisition field and relates to an aviation storage battery cell information acquisition apparatus. In order to ensure the maintenance quality of a storage battery, the voltage and temperature of the cells of the storage battery should be periodically monitored and recorded in a maintenance process. At present, two data acquisitionmethods are adopted, one method accomplishes recording by means manual measurement, and the other method adopts a lantern ring type acquisition probe, the latter is inconvenient to use, and acquiredinformation is undiversified, and short circuits and fires can be easily caused by collision and friction between lantern rings. The lower part of the universal and convenient-to-use aviation storagebattery cell information acquisition device provided by the invention is a worktable, and the upper part of the device is a cover plate which can be moved up and down; a storage battery slide rail isarranged on the worktable; and a plurality of probes corresponding to each cell of the storage battery and an information acquisition output end are distributed on the cover plate. With the aviation storage battery cell information acquisition apparatus of the invention adopted, the workload of maintenance personnel can be decreased, and storage battery information acquisition efficiency and safety can be improved.

The invention provides a device and method for rapidly disassembling and assembling a middle joint point of a carry-scraper. The device comprises a hydraulic jack, a sleeper box and moving pin rollers. A separation layer iron plate used for holding the hydraulic jack is arranged in the middle of the sleeper box. Moving pin roller fixing holes are formed in the side faces, where the separation layer iron plate is located, of the sleeper box. A hydraulic jack oil pipe connector hole is formed in the side face of the portion, above the separation layer iron plate, of the sleeper box. The side face of the hydraulic jack is provided with a hydraulic jack oil pipe connector installed in the hydraulic jack oil pipe connector hole. The two sides of each moving pin roller are respectively provided with a moving pin roller fixing end installed in the corresponding moving pin roller fixing hole. The height of the jack is adjusted by 0 cm to 10 cm through hydraulic pressure, a left turning oil cylinder and a right turning oil cylinder of the device extend and retract at the same time according to the hydraulic principle, so that the middle joint point of the carry-scraper is rapidly disassembled and assembled, the labor intensity is relieved, and the reliability and stability of disassembling of the middle joint point are improved.

The invention discloses a secure communication method based on fractional Fourier transform order multiplexing, and belongs to the technical field of communication. The method comprises the following specific steps: (1) receiving transmission data and recording data information; (2) carrying out security detection on the transmission data; (3) carrying out encryption processing on the transmission data to generate a communication frame; (4) monitoring a communication security environment in real time; (5) receiving the communication frame and carrying out data decoding on the communication frame. According to the invention, the transmission of violation information can be effectively prevented, the efficiency of maintaining the security and legality of a network environment is improved, the network environment is purified, the requirement of people for surfing the Internet healthily is ensured, the probability of data leakage can be reduced and the data security can be ensured when data is attacked by external personnel in a transmission process, and the security of the data is ensured; and the attack source position can be positioned, so that the personal information security and the public security can be maintained.

The invention provides a lubricating oil chip monitoring and alarming annunciator which comprises an annunciator assembly, a check ring, a wave spring, a shell and an oil drainage valve, a cavity is formed in the shell, a lubricating oil inlet and a lubricating oil outlet are formed in the upper side and the side edge of the shell respectively, the shell is provided with an oil drainage opening, and the oil drainage valve is installed in the oil drainage opening; the annunciator assembly is limited in a cavity of the shell through a check ring and a wave spring, the annunciator assembly comprises a plurality of conductive gaskets, an end cover assembly, a nut, an outer sleeve, a lantern ring, an electric socket with a plurality of contact pins and a metal rod, and the metal rod is arranged in the cavity of the shell in the axis direction of the lubricating oil outlet. The lantern ring and the end cover assembly are distributed on the two axial sides of the metal rod, a plurality of conductive gaskets are arranged between the lantern ring and the end cover assembly, the insulating outer sleeve is arranged between the end cover assembly and the lantern ring, part of the contact pins are connected to the lantern ring, and the other part of the contact pins are connected to the metal rod. And when the metal chips are gradually accumulated at the conductive gasket to fill the gap, the lantern ring and the end cover assembly are conducted with the metal rod to form an access.

The invention relates to a deep screening and crushing process of a raw coal system, and relates to the technical field of coal mining equipment. Raw coal, a screening system and a crushing system are involved in the deep screening and crushing process, the raw coal is connected with the screening system through lifting equipment, the screening system is connected with the crushing system through a large-dip-angle belt conveyor, the screening system comprises a double-layer flip-flow screen. and the crushing system comprises a double-geared roller crusher and a cone crusher. The deep screening and crushing process of the raw coal system is transformed by means of a raw coal deep screening and crushing system, the production process can be perfected, the raw coal transportation capacity is improved, the adopted cone crusher can flexibly adjust the discharging granularity, and the problem of large slime water treatment pressure caused by excessive crushing is solved; and the washed raw coal is deeply screened and crushed, and the reasonable washing granularity can be determined according to the property of the washed raw coal in production practice, so that the clean coal yield is further improved, and the economic benefit is improved.

The invention relates to a turning tool, and discloses an automatic turning tool for a power generator collecting ring. The automatic turning tool for the power generator collecting ring comprises a workbench, a first sliding block is installed on the workbench, and a tool rest is installed on the first sliding block; the automatic turning tool for the power generator collecting ring further comprises a lead screw, and a first gear and a first chain wheel are installed at the outer end of the lead screw; a second sliding block is installed on the upper end face of the workbench, a first motoris fixed to the second sliding block, a second gear and a second chain wheel are installed on an output shaft of the first motor, and the first chain wheel and the second chain wheel are connected through a chain; and a first rotation shaft and a second rotation shaft are arranged at the two ends of the workbench, a third gear and a third chain wheel are fixed to the first rotation shaft, a fourthgear and a fourth chain wheel are fixed to the second rotation shaft, the first gear meshes with the third gear, the second gear meshes with the fourth gear, and the third chain wheel and the fourthchain wheel are connected through a chain. According to the automatic turning tool for the power generator collecting ring, the structure is simple, manufacturing is convenient and fast, the cost is low, dual driving is achieved, and the equipment stability is improved.

The invention provides a device and method for rapidly disassembling and assembling a middle joint point of a carry-scraper. The device comprises a hydraulic jack, a sleeper box and moving pin rollers. A separation layer iron plate used for holding the hydraulic jack is arranged in the middle of the sleeper box. Moving pin roller fixing holes are formed in the side faces, where the separation layer iron plate is located, of the sleeper box. A hydraulic jack oil pipe connector hole is formed in the side face of the portion, above the separation layer iron plate, of the sleeper box. The side face of the hydraulic jack is provided with a hydraulic jack oil pipe connector installed in the hydraulic jack oil pipe connector hole. The two sides of each moving pin roller are respectively provided with a moving pin roller fixing end installed in the corresponding moving pin roller fixing hole. The height of the jack is adjusted by 0 cm to 10 cm through hydraulic pressure, a left turning oil cylinder and a right turning oil cylinder of the device extend and retract at the same time according to the hydraulic principle, so that the middle joint point of the carry-scraper is rapidly disassembled and assembled, the labor intensity is relieved, and the reliability and stability of disassembling of the middle joint point are improved.

The invention relates to a 5G communication tower with high maintenance safety, including a support rod, a support plate, an antenna and a ladder, the support rod is arranged vertically, the support plate and the support rod are coaxially arranged, and the diameter of the support plate is is larger than the diameter of the support rod, the support plate is fixed on the top of the support rod, the antenna is arranged on the top of the support plate and is facing the support rod, the support plate is provided with an inspection hole, and the axis of the inspection hole Parallel to the support rod, the support plate is provided with a protection mechanism and a snow removal mechanism, the protection mechanism includes a protection tube, a sealing assembly and at least two moving assemblies, the snow removal mechanism includes at least two snow removal assemblies, and the snow removal assembly Set in the protective tube and corresponding to the mobile components one by one, the 5G communication tower with high maintenance safety realizes the function of improving maintenance safety through the protection mechanism, not only that, but also realizes the snow removal function through the snow removal mechanism.

The invention discloses a spherical valve overhaul sealing control method which is characterized in that the spherical valve overhaul sealing control method comprises the following steps that a, the area of an opening cavity of a movable sealing ring in a spherical valve, the area of an upstream high pressure cavity, the area of an upstream input cavity and the area of a downstream pressure cavityare set; b, normal overhaul is carried out, a water turbine is shut down, a valve body of the spherical valve is fully closed through a servomotor, the movable sealing ring is put in, water in a downstream pipeline of the spherical valve is drained, and the movable sealing ring is pressed under the pressure of the upstream input cavity and the pressure of the upstream high pressure cavity; c, extreme overhaul is carried out, the upstream input cavity is subjected to pressure loss, the opening cavity is subjected to pressure buildup, and the movable sealing ring is pressed; and d, after the overhaul, a by-pass line is opened for carrying out pressure balance on the upstream side and the downstream side of the spherical valve. The free input and withdrawing of overhaul sealing in a normal overhaul state can be realized, the situation that the overhaul sealing is not opened during misoperation can be guaranteed, the safety of a maintainer is ensured, and the spherical valve overhaul sealing control method has the characteristics of convenience in operation, safety and reliability.

The invention belongs to coal mine winch dispatching equipment, particularly discloses a dispatching winch system, and solves the problems that counterweight dispatching winch equipment is difficult to maintain, danger coefficient of an operator performing overhead working is high, the time for the operation process is long and the steel wire rope tension is insufficient. The dispatching winch system comprises a dispatching winch and a tractor, wherein the dispatching winch is connected with the tractor through a steel wire rope II; a drum of the dispatching winch is wound with the steel wire rope II; two ends of the steel wire rope II bypass a plurality of guide pulleys respectively to be connected with an advancing end and a retreating end of the tractor; the dispatching winch system further comprises a civil foundation and hydraulic control systems fixed on the civil foundation; and the two sets of hydraulic control systems are connected with the steel wire rope II located on two sides of the dispatching winch respectively. The dispatching winch system is high in automation degree, complete in intelligent protection, simple to operate and safe and stable in operation and does not have high requirements for the operating environment.

A high-voltage equipment box, including a box, a high-voltage grounding switch located in the box, a voltage transformer, a lightning arrester, a high-voltage isolation switch and a vacuum circuit breaker, the box is divided into a low-voltage area and a high-voltage area by a partition, and the high-voltage The low-voltage part of the isolating switch and the low-voltage part of the vacuum circuit breaker are all installed in the low-voltage area; the high-voltage grounding switch and the high-voltage part of the vacuum circuit breaker are all installed on the side of the partition located in the high-voltage area, and the high-voltage part of the high-voltage isolating switch The supporting insulators are installed on the bottom surface of the high-voltage area, and the voltage transformers and arresters are respectively installed on the opposite side walls of the high-voltage area; main top cover. The high-voltage equipment box and the low-voltage section of the invention are beneficial to the maintenance of the high-voltage equipment, and the high-voltage equipment adopts a combination of side wall installation and bottom surface installation, which can reduce the overall volume of the high-voltage equipment box.