85results about How to "No maintenance" patented technology

The anti-slip device and tubing string are characterized by comprising an integrated U-shaped injection valve, an integrated U-shaped injection control valve, tubing, etc. Several integrated U-shaped injection valves spaced several meters apart are connected to the tubing string, and multiple integrated U-shaped injection control valves spaced several meters apart are connected to the tubing string, forming the anti-slip device and tubing string. Within the anti-slip device and tubing string, there are several U-shaped injection ports and multiple channels, as well as several upward-vertical-downward-vertical-upward U-shaped channels and gas-liquid mutually sealed end faces, forming a gas-driven liquid flow pattern. This prevents liquid backflow and slippage while retaining the rising gas. The channels of the integrated U-shaped injection control valve are used to introduce gas from outside the integrated U-shaped injection control valve into it to reduce the density of the fluid passing through it. This achieves the purpose of lifting, producing, and discharging deep-well liquids with lower gas pressure and volume, preventing liquid slippage and backflow, and improving the efficiency of gas lift liquid production and discharge.

The invention relates to an epoxy resin pouring type transformer with built-in microcirculation cooling channels and a heat dissipation method of the epoxy resin pouring type transformer, and belongs to the technical field of power transformers. The epoxy resin pouring type transformer comprises an iron core, a low-voltage winding, a high-voltage winding and a heat dissipation shell, the low-voltage winding and the high-voltage winding are completely impregnated and wrapped by an epoxy resin composite material through a vacuum pouring process, an integrated epoxy resin pouring body is formed after curing, and a three-dimensional communicated bionic microcirculation cooling channel network is arranged in the epoxy resin pouring body; the heat dissipation shell is in close contact with the outer surface of the epoxy resin pouring body through the high-heat-conductivity insulating medium. According to the invention, the heat dissipation efficiency can be remarkably improved, and a cooling medium (air) is directly guided to a microscopic area around the winding conductor through a three-dimensional communicated and tree-shaped fractal bionic microcirculation cooling channel network, so that the effective heat exchange area and the heat exchange strength are greatly increased, and internal heat can be accurately and efficiently taken away.

The invention discloses an intelligent water meter and a water meter metering data transmission method and system, which are applied to the field of intelligent water meters and comprise the steps that when water flow pushes an impeller to rotate, a permanent magnet generates a periodic alternating magnetic field; the magnetic induction energy taking element is used for generating pulse energy when the periodic alternating magnetic field is generated; the water flow meter is used for obtaining water flow metering data; the energy conditioning module is used for processing the pulse energy to obtain electric energy with stable voltage; the electric energy is used for supplying power to the storage module, the data identification module and the wireless transmission module; the storage module is used for storing water flow metering data; and the wireless transmission module is used for transmitting the water flow metering data in the storage module to a client. Electric energy generated by the magnetic induction energy taking element is used for supplying power to the wireless transmission module, the data identification module and the storage module, and battery-free water meter metering and data transmission are achieved. And a battery-free, maintenance-free and power-consumption-free solution is provided for the flow metering terminal.

The utility model provides a single line air suction type seed sowing fan, including zinc plate upper shell, fan blade, air guide wheel, motor body shell, double balanced axle, stator, rotor cover, PCB board, magnet cover, white conductor, blue conductor and yellow conductor, air guide wheel is nested in galvanized sheet upper shell inside lower end through a plurality of screws, fan blade is encapsulated between zinc plate upper shell and air guide wheel, and fan blade is fixed in double balanced axle outside upper end through fan blade flange nut and gasket, this design has solved the problem that the existing seed sowing fan often exists low efficiency, easy to block, maintenance frequently, short life etc. For example, the traditional fan motor is not high in efficiency, dust and moisture are easy to enter the bearing and cause failure, and the problems of insufficient air volume and air pressure, the single line air suction type seed sowing fan structure compact, high efficiency of the utility model design is applicable to various brand seed sowing device, has improved the reliability and economy of sowing operation.

The utility model discloses a kind of gas-liquid two-phase flow wide gas-liquid ratio and wide-range measurement system, belong to oil-gas field multiphase flow measurement technical field, including flow computer, separation component, fluid inlet pipeline and fluid outlet pipeline, the separation component is communicated with fluid inlet pipeline, liquid level meter and inlet pressure gauge are equipped on the separation component, gas phase pipeline and liquid phase pipeline respectively communicated with its inside are equipped on the separation component, liquid level control mechanism is equipped in the separation component, the liquid level control mechanism is used to close separation component and gas phase pipeline passage when liquid level in separation component rises, the one end of gas phase pipeline and liquid phase pipeline away from separation component is communicated with fluid outlet pipeline, gas phase flowmeter is equipped on the gas phase pipeline, liquid phase flowmeter and liquid path valve are equipped on the liquid phase pipeline.The utility model can select different measurement mode according to different working conditions, ensure the accuracy of measurement.

This invention relates to a commercially compatible and flexibly deployable OFDM backscatter communication method and system, belonging to the field of wireless communication. This invention enables nodes to perform backscatter communication without deploying synchronization modules, transmitting their own information to a commercial OFDM receiver with low power consumption, thus avoiding the limitation of node deployment range imposed by the sensitivity of synchronization modules. This invention uses a single-carrier signal from the environment as the excitation signal and transmits node information to the OFDM receiver through low-power cross-system conversion from single-carrier to multi-carrier. For the incident single-carrier excitation signal, the node performs low-power replication and shifting of the signal's spectrum during reflection, converting it into an OFDM reflected signal with multi-carrier characteristics. Since the node does not need to synchronize with the excitation signal before reflection, this invention significantly increases the effective operating radius of the backscattering node and enhances node deployment flexibility. Simultaneously, because the node achieves cross-system conversion from single-carrier to multi-carrier OFDM signals, it also possesses the advantage of commercial compatibility.

The present application relates to the technical field of wireless passive sensing, and discloses a differential sensing system for metal crack detection and a quantitative detection method thereof, which comprises an RFID reader-writer and a passive RFID differential sensing tag; the passive RFID differential sensing tag comprises a communication antenna, an RFID chip, an impedance matching network, a planar inductive sensing module, a radio frequency switching module, an energy recovery module and a data processing unit; the impedance matching network is connected between the communication antenna and the RFID chip; the planar inductive sensing module comprises a reference planar inductor and a sensing planar inductor; after double-state alternate sampling of the reference sensing, difference is performed, so that environmental disturbances such as reading and writing distance, sensor posture, multipath and temperature drift are significantly suppressed, and differential noise suppression is realized; the switching module is powered by the energy collection antenna, voltage doubling rectification and charge management module in the energy collection management module, battery maintenance is avoided, and passive operation is realized.

The disclosure provides a dual-mode running system, the system comprising: a gateway layer for identifying a target tenant identifier corresponding to an external service request, encapsulating the target tenant identifier into the external service request to obtain an update request; a service layer for obtaining the update request, determining a corresponding tenant mode portrait based on the update request, and assembling a strategy set based on the tenant mode portrait; a strategy layer for storing and outputting the strategy set; a data access layer for intercepting a data access request based on a first interface, and executing a corresponding isolation strategy on the intercepted data access request based on the tenant mode portrait; a migration and configuration layer for responding to a migration request, and migrating a first-mode tenant from a first mode to a second mode by switching a running environment configuration of the first-mode tenant.

The utility model relates to sewing machine motor technical field, concretely, the utility model relates to a sleeve shaft direct drive motor with winder, including the shell, be equipped with the stator in the shell, be equipped with the rotor in the stator, the hollow rotating shaft is connected to the rotor, the hollow rotating shaft one end is connected with the rotating shaft of sewing machine body, the hollow rotating shaft other end is connected with the fixed needle inner core and hand wheel, be equipped with the hall board with being connected to the stator, be equipped with control element on the hall board, be equipped with magnet on the fixed needle inner core, the magnet is located control element one side, be connected with the winder on the shell, the winder includes the rotating wheel, the rotating wheel is in the winder work with hand wheel and the resistance is tight, this integral motor whole simple and stable structure, easy and fast installation, bearingless design, low cost, solved the problem that sewing machine modification direct drive motor does not have the winder, make it have the winding function and fixed needle function, effectively improved the efficiency of worker sewing.

This utility model relates to the field of mechanical engineering technology, specifically a self-lubricating guide wheel assembly structure, including a wheel frame. A bearing is located in the center of the wheel frame, and a wheel body is rotatably mounted on the outer side of the bearing. Annular grooves are formed on both sides of the center of the wheel body. Guide channels are formed around the perimeter of the upper part of the center of each of the two annular grooves. A cover plate is provided on one side of the center of each of the two annular grooves, and a sealing ring is fixedly installed on one side of each of the two cover plates. An oil injection hole is penetrated through one side of the center of each of the two sealing rings. This utility model stores grease in the annular grooves and uses centrifugal force to precisely deliver grease to the connection between the wheel and the bearing through the guide channels, achieving continuous self-lubrication of the bearing friction surface. The structure of the oil injection hole and plunger allows for grease replenishment without disassembling the wheel, significantly reducing maintenance costs. Simultaneously, the dual protection of the dust cover and sealing rings ensures the cleanliness and stability of the grease, significantly extending the service life of the wheel assembly.

The utility model relates to the technical field of semi-autogenous mills, and discloses an efficient collecting type semi-autogenous mill for hard stone difficult to grind, which comprises an L-shaped base and a motor base, an air cylinder bottom plate is arranged on the inner wall of the L-shaped base, an air cylinder is arranged at the top of the air cylinder bottom plate, a connecting block is arranged at the output end of the air cylinder, a rotating shaft is rotatably connected to the inner wall of the connecting block, and a motor is arranged on the rotating shaft. A first fixing block is arranged on the outer wall of the L-shaped base, connecting rods are rotationally connected to the outer walls of the multiple rotating shafts, a plurality of second fixing blocks are arranged on the right side of the motor base, and a supporting block is arranged at the top of the motor base. According to the utility model, through the mutual cooperation of the air cylinder, the connecting block, the rotating shaft, the first fixing block, the connecting rod, the second fixing block and other structures, crushed hard rock in the autogenous grinding barrel is fed into the discharge port through the chute, and the crushed hard rock is collected, so that the manpower is saved, and the productivity is improved.

The invention discloses a pocket-size outdoor switch and control mechanism with a grounding function. The outdoor switch and control mechanism with the grounding function comprises a switch body with a grounding function, a transmission part and an electric control box. The invention discloses an outdoor grounding switch and a control mechanism. A switch body is composed of a machine base part, a conductive part and a grounding part. The base part is composed of a base, a main shaft, a middle swing rod and a grounding part. A transmission component is in butt joint with a self-made energy-saving mechanical ball distance-limiting safety coupler at an upper port of a control box below through a coupler and a transmission rod, namely a double-end cross-shaped spline telescopic universal joint, wherein the constant-angular-velocity bevel gear pair is arranged at the output shaft end of a main shaft of a switch body and has a 90-degree intersection angle; and the self-made energy-saving mechanical ball distance-limiting safety coupler is arranged at the upper port of the control box below. The electric control box outputs torque of 12.Nm through a direct current torque motor, speed reduction is carried out through a 1: 4 bevel gear, and a main shaft in the electric control box is used for controlling the outdoor disconnecting switch which is 3 m high above to be switched off / switched on at the speed of 4 revolutions per minute and the torque of 48 N.m. All parts reach the interchange standard, and the switch is produced nationwide, is low in energy consumption, is environment-friendly, and can meet the urgent demands of metros, light rails, rails, intercities and the like in urban rails in China at present for high and medium voltage energy-saving outdoor isolation switches.

The utility model relates to an embedded rail area signal radar speed measuring device for urban rail transit, which comprises a microwave reflecting device, the microwave reflecting device is a zinc-plated solid iron block, the zinc-plated solid iron block comprises a solid iron core and a zinc-plated layer plated on the surface of the solid iron core, and the surface of the solid iron core is coated with a metal coating. A counter bore used for installing an anchor bolt is formed in the galvanized solid iron block. The utility model has the advantages that: 1) the device is maintenance-free and high in reliability: the device is installed and fixed on a ballast bed by punching a chemical anchor bolt, so that the firmness of a reflector can be ensured, and the maintenance workload is basically avoided in the operation period; 2) the cost is low: the galvanized solid iron block is adopted, materials are universal and easy to purchase and install, and the steel rail and the ballast bed are not influenced; and 3) the generalizability is strong: when the embedded rail is popularized and used in the urban rail transit field, the radar microwave signal reflection quality can be effectively improved, the normal working requirement of a radar velometer can be met, and the application of the reflection device can effectively solve the problem of radar microwave reflection failure.

This invention relates to a method and system for treating interface contaminants in a mixing and clarification tank, belonging to the field of nuclear fuel reprocessing. The method involves conveying interface contaminants to the final stage mixing and clarification tank via top-tank operation, separating the organic phase, and then returning the liquid containing interface contaminants from the final stage mixing and clarification tank to the organic phase inlet of the first stage mixing and clarification tank. The interface contaminants are dispersed by the agitation of the pump impeller within the mixing and clarification tank, thereby redissolving radioactive materials in the liquid. This invention utilizes in-situ treatment of interface contaminants and recovery of radioactive elements in a mixing and clarification tank, significantly reducing the accumulation of radioactivity in interface contaminants, mitigating radiation damage from organic solvents, and is simple to operate without requiring additional treatment equipment.

The utility model relates to commodity display stand technical field, concretely is a screen product turntable, include: base, base includes mounting panel, and the transmission shaft is rotationally installed in the mounting panel centre, drive component, drive component includes power source, and power source passes through the lifting structure and is installed at the mounting panel bottom surface, turntable, and the transmission shaft top of turntable is clamped, is used for bearing commodity. The utility model, utilize magnetic coupler and connect power source output shaft and transmission shaft, realize zero contact transmission, reduce working noise, no contact transmission, can be convenient for operator to stop turntable rotation display details at any time, will not influence power source work, will not heat, through change driven magnetic ring and insert the depth of initiative magnetic ring, change transmission torque, can adapt to different weight commodity, transmission structure is simple and need not maintain.

The invention relates to a non-electric-control medical liquid oxygen two-way decompression tank and a medical central oxygen supply system in the technical field of medical instruments, and aims to solve the problems of electric spark safety risk, low reliability and inconvenience in maintenance in the existing electric control scheme. According to the technical scheme, a pure mechanical structure is adopted, a main air inlet pipeline and a standby air inlet pipeline are included, each air inlet pipeline is provided with a one-way valve and a dual-backup pressure regulating valve set composed of pressure regulating valves connected in parallel, and an outlet of the standby pipeline is connected between a first one-way valve of the main pipeline and the main pressure regulating valve set through a fourth one-way valve; the main path pressure is preset to be higher than the standby path pressure, the one-way valve is driven to be automatically opened and closed through the pressure difference, power-free and seamless switching of the main gas source and the standby gas source is achieved, and the safety valve is arranged to guarantee overpressure safety. The oxygen supply system is mainly used for a hospital center oxygen supply system, and continuous, safe and stable oxygen supply is ensured.

The application belongs to the technical field of ship wind power boosting, and relates to a rotating cylinder wind sail deicing system based on a fluid rotary joint and a control method. The system uses the waste heat generated by the cylinder sleeve water of a ship main engine or a waste gas boiler as a heat source, and through a closed circulation loop, fluid medium is introduced into a high-speed rotating rotating cylinder internal spiral pipe or a sandwich flow channel through a multi-channel fluid rotary joint, so that the cylinder wall surface is uniformly heated. The system adopts a coaxial rotary joint structure of "inner pipe inflow and outer pipe backflow", cooperates with a balanced end face seal and an O-shaped ring to ensure leak-free transmission, and integrates environmental temperature and humidity, infrared cylinder wall temperature and vibration sensors, and switches the ice prevention, deicing and shutdown blowing modes intelligently by a PLC. The application discards high-energy-consumption electric heating slip rings, realizes zero additional power consumption, intrinsic safety and high-reliability ice prevention and deicing, significantly improves the ship energy efficiency index, and is suitable for cold region navigation scenes such as oil tankers and polar ships.

The utility model provides a trajectory environment collection mechanism, including shell, reading board part, collection module group and detection circuit group, reading board part collection module group along the axial direction of shell from top to bottom sets gradually, reading board part collection module group and detection circuit group are fixedly connected through the terminal strip and screw, when reading board part collection module group and detection circuit group assemble in place, will make the turn and screw cap and install in the shell, and use electronic pouring sealant to pour seal the space between reading board part collection module group and detection circuit group. The utility model discloses a trajectory environment collection mechanism, through the integrated structure design, waterproof performance is excellent, and the anti -interference ability is strong, safe, and the reliability is high.

The utility model provides a wind power tower multidirectional strain monitoring device based on fiber bragg gratings, and relates to the technical field of wind power tower monitoring. Comprising a decagonal mounting shell, a strain sensor center pile and a plurality of insertion piles, the mounting shell is composed of a bottom shell, a top shell and ten connecting plates, the center pile is arranged in the center of the bottom shell, and insertion openings are formed in the side edges of the center pile. The splicing piles are hollow cuboids, grating strings are arranged in the splicing piles, and the two ends of each splicing pile are optically connected with the center pile and the adjacent splicing piles through splicing plugs respectively, so that 360-degree all-circumferential strain monitoring is achieved. The device adopts an all-fiber, passive and modular design, is convenient to install, anti-interference and maintenance-free, and is suitable for distributed strain monitoring of the wind power tower.

This utility model relates to the field of firefighting robot technology, specifically disclosing a firefighting robot chassis with a drainage structure. The chassis includes a chassis body, on which a guide surface for directing liquid flow is provided, and drainage holes are opened at the end of the guide surface, together forming an active drainage structure. Preferably, the guide surface is an inclined or curved surface, and the drainage holes are concentrated at the lowest point of the bottom of the sunken equipment compartment (such as a pump compartment) on the chassis. This utility model achieves efficient and directional drainage through physical structure, quickly removing water accumulated on the chassis surface during operation, effectively preventing water ingress into the equipment compartment, protecting critical equipment from short circuits and corrosion damage, and significantly improving the reliability and durability of the firefighting robot in humid and harsh environments such as wading and spraying. The structure is simple and reliable, requiring no additional power or maintenance.

The utility model relates to a kind of motor rotor structure for realizing rotor flux better sinusoidal distribution, belong to motor technical field, including protective shell, the protective shell is located in rotor, the rotor and protective shell are equipped with stator, the rotor is equipped with magnetic separation slot and magnetic filling slot, the magnetic filling slot is inserted and embedded permanent-magnetic strip, the permanent-magnetic strip includes permanent magnet I, permanent magnet II and permanent magnet III. Permanent magnet I and permanent magnet II, permanent magnet III superposition realizes rotor flux better sinusoidal distribution. Permanent magnet I, permanent magnet II, permanent magnet III and magnetic separation slot jointly form cross-axis magnetic circuit, due to the formation of reluctance torque superposition, thereby increase torque. By optimizing rotor magnetic pole shape, permanent magnet arrangement and auxiliary structure are realized, to reduce harmonic content, improve torque stability. Realize the good sinusoidal distribution of rotor flux, low motor torque ripple and slot effect, to improve the stability of motor operation, efficiency and control accuracy.

The utility model relates to ozone preparation technical field, concretely is a kind of ozone generator zero potential grounding pile improved device, including cylinder shell, the side surface of cylinder shell is equipped with semicircle arc door and mounting bolt.The utility model is installed cylinder bottom foot terminal post and cylinder base terminal post respectively on the surface of cylinder support bottom foot and cylinder support base and respectively set up first circular hole and second circular hole on the surface of both, can make all grounding cable O type copper terminal and cylinder bottom foot terminal post and cylinder base terminal post contact surface level, completely coincide, contact surface is very big, contact resistance is very small at this contact surface, its construction flow arrangement is orderly, the grounding pile of improvement low in cost, less material, simple to make, easy to install, at a glance, long time maintenance-free, operation is safe and reliable, it is convenient and simple to use, ensure that ozone generator cylinder shell is not electrified, each grounding pile and outdoor total grounding electrode contact installation are good.

The utility model provides a kind of sensor for road surface temperature detection, belong to road surface temperature detection technical field, including lower support mechanism, lower support mechanism includes square frame, the top middle part of square frame is equipped with adapter box, the bottom of adapter box is equipped with lifting cavity groove, the inner wall of groove position of lifting cavity groove is vertically equipped with lifting rod, the rod body bottom middle part of lifting rod is equipped with adapter seat, the bottom of adapter seat is equipped with upper top cover, the acquisition of information is realized by the temperature detection rod and the one end of access socket joint seat, the information temperature of ground surface is realized to transfer, the one end of access socket joint seat and sensing flat cable is realized to transfer information, the surface mechanical energy information of analysis cable on the surface of signal analysis circuit board is realized to transfer, the one end of analysis cable is realized to transfer signal, with high-energy lithium battery power supply, field collection road surface ground temperature data.

This application belongs to the field of cigarette manufacturing technology, specifically relating to a glue application device for bonding filter tip forming paper, including a mounting bracket mechanism, a hot melt glue gun, and a forming paper glue application mechanism; the mounting bracket mechanism is used to fix the glue application device; the hot melt glue gun is set at the top of the mounting bracket mechanism and is used to apply hot melt glue for bonding the forming paper. One end of the glue nozzle has two sets of glue outlet holes, which are used to apply glue lines for bonding the overlapping joints of the forming paper and for bonding the forming paper to the filter element, respectively. Controlled by the opening and closing of a solenoid valve, the glue liquid is squeezed out from the glue outlet holes on both sides of the glue nozzle to form two sets of glue lines, while the hot melt glue gun independently applies a third set of glue lines, realizing triple bonding function. The structure is simplified, the cost is reduced, it is suitable for large-scale industrial applications, supports hot melt glue of various viscosities, is flexible in operation, does not require frequent shutdowns for cleaning, has stronger adaptability, the solenoid valve is a standard part with a long service life, the glue nozzle fixing design reduces wear, the equipment operates stably, and requires virtually no maintenance.

The utility model discloses a kind of UV photocuring solder resist oil devices of anti-dripping, including nozzle pipeline, the nozzle pipeline is hollow tubular structure, one end is glue inlet, the other end is nozzle outlet, the upper end of the nozzle pipeline is equipped with solder oil pipe fitting;Spring-loaded valve body mechanism is set to nozzle outlet inside, the spring-loaded valve body mechanism includes valve body, reset spring and limiting support;The valve body lower end is T-shaped, one end of the reset spring is fixedly connected valve body lower end outer wall, the other end is fixed on limiting support;And nozzle body, the nozzle anti-dripping mechanism of the present application simple structure, without power supply control, response fast, automatic opening and closing, maintenance-free and strong adaptability, utilize the natural balance of oil pressure and elasticity, realize the automatic opening and closing and physical seal of nozzle, effectively prevent glue liquid from leaking in non-operating state, improve the cleanliness, stability and service life of point glue equipment.

This application discloses a composite structure phase-determining cycloidal oilless crossed roller guide, belonging to the technical field of crossed roller guides. It mainly includes a rotating ring, a sealing ring, a first positioning ring, and a second positioning ring. A V-shaped track groove is formed in the middle of the rotating ring facing the first and second positioning rings. A pin mounting cavity is formed on the rotating ring away from the V-shaped track groove, and pin teeth are distributed along the circumferential direction within the pin mounting cavity. This application achieves coaxial integration of drive and guide through the rotating ring, first positioning ring, second positioning ring, rotating ring, roller, pin mounting cavity, pin, pin shaft drive, and V-shaped track groove, eliminating assembly eccentricity and backlash. The phase-determining cycloidal structure achieves zero cumulative error and high repeatability accuracy. The combination of self-lubricating metal and engineering plastic enables completely oil-free operation and eliminates the need for lubrication maintenance. The composite pin tooth structure of the pin shaft and pin reduces friction, noise, and heat generation, improving durability.

The utility model discloses a tick trapping and monitoring device, and relates to the technical field of tick monitoring. A tick trapping and monitoring device comprises an installation cylinder and a tick inlet cover detachably connected to the installation cylinder, and further comprises an installation ring fixedly installed in the installation cylinder and provided with a plurality of sets of storage grooves in a surrounding mode, a sealing ring is rotatably installed on the installation ring, and at least one air hole is formed in the sealing ring; the leakage hole of the tick inlet cover is dynamically blocked through the sealing cover, high-concentration trapping gas is accumulated in the non-active period of ticks and instantly released in the active period, trapping gas jet flow and attractant gas concentration gradient are formed, the trapping range is rapidly covered, and the tick response intensity and trapping efficiency are remarkably improved; after each time of release, the sealing ring rotates by one station, a single storage tank is only exposed for one period, and release is carried out twice a day, so that maintenance-free for continuous multiple days can be realized, and the maintenance frequency is reduced.

This utility model relates to a fixing structure for a photovoltaic power station on a concrete flat roof, belonging to the field of photovoltaic power station fixing technology. The photovoltaic power station includes multiple photovoltaic brackets arranged in a straight line at equal intervals. The two mounting ends of the photovoltaic brackets are respectively fixed to two concrete counterweights, which are fixed to the roof. A concrete parapet wall is set on each side of the photovoltaic bracket arrangement direction, and the concrete counterweights are fixed to the roof. The two ends of the fastening cables are respectively fixed to the two concrete parapet walls, and the fastening cables are fixedly connected to all the concrete counterweights. This solves the problem of insufficient load-bearing capacity of the current roof for photovoltaic power stations.

The utility model relates to a kind of middle-high voltage fast electronic switch unit and its control system, belong to power electronics field.Electronic switch unit includes multiple groups of thyristor anti-parallel component with blocking capacitor voltage-sharing circuit in series, and thyristor anti-parallel component is connected in series by radiator;Resistance-capacitance voltage-sharing circuit is connected in parallel in each group of thyristor anti-parallel component.Electronic switch unit is controlled by the system of overvoltage protector, temperature detection device, current detection device, PECS controller and thyristor trigger device.Electronic switch unit is connected with overvoltage protector, and thyristor trigger device is connected with PECS controller and electronic switch unit respectively;Temperature detection device and current detection device are connected with PECS controller respectively.The utility model can quickly respond switch instruction, realizes high-low voltage electrical isolation, and guarantees equipment and personnel safety.