66results about How to "Not damaged by" patented technology

The invention relates to a vehicle comprising an at least partial electric drive which comprises a traction battery (1), which vehicle has at least one predefined deformation zone (I, II) which in the event of a crash (A, B) acts to absorb energy, and at least one predefined zone (III), which has high component rigidity and which in the event of a crash (A, B) remains substantially without deformation. According to the invention, the traction battery (1) has a deformation region (18) which in the event of a crash can be deformed via a deformation path (a) and which is arranged in the deformation zone (I, II) of the vehicle.

The invention discloses a retractable street lamp capable of being stored and belongs to the technical field of illumination equipment. The street lamp solves the problems that street lamps in the prior art occupy a great amount of ground space when not in use and are inconvenient to convey and repair. The street lamp includes a lamp group device at the top and a short rod and is characterized inthat the lamp group device is connected with a first hinge, the first hinge is connected with a second hinge through the short rod, the second hinge is connected with a rotating rod, the rotating rodis connected with a third hinge, and a retractable rod is connected to the lower portion of the third hinge; a first retractable cylinder is connected to the lower portion of the retractable rod, a second retractable cylinder is connected to the lower portion of the first retractable cylinder, a bottom outer cylinder arranged on the ground is connected to the lower portion of the second retractable cylinder, and an underground storage cavity is formed in the lower portion of the bottom outer cylinder. The height of the street lamp can be retractably adjusted, and the street lamp can be storedunderground and is applicable to the occasion when there is no need to turn on the street lamp on a road at daytime.

The invention relates to the technical field of new energy and discloses new energy power battery fixing device comprising a placement box. A sealing strip is arranged at the top of the placement box,a clamping device is arranged in the placement box, a cooling fan is fixedly installed on the surface of the placement box, a sealing device is arranged on the surface of the cooling fan, and a threading hole is formed in the surface of the placement box. According to the new energy power battery fixing device, the top of the fixing device is sealed through the sealing strip; dust of the coolingfan is filtered through the filter screen; when the cooling fan rotates, a cleaning brush is driven to rotate so as to clean dust on the surface of the filter screen; the fixing device is convenient to seal, dust on the surface of the filter screen is convenient to clean, the probability of blockage of the filter screen is reduced, accumulation of dust on the surface of the filter screen is reduced, the heat dissipation effect is improved, the sealing performance of the fixing device is improved, and the content of dust in the fixing device is reduced.

The invention discloses a method for detecting the work state of a converter. The method includes: an effective value determination step of an output current of a generator side converter- determining the effective value of each phase of the output current of the generator side converter according to the rotating speed of a motor; and a work state determination step of the converter- determining the work state of the converter according to the effective value of each phase of the output current of the generator side converter. According to the method, IGBT failure and damage to an upper IGBT and a lower IGBT of a leg or the whole leg of the converter or the state of IGBT driving signal loss can be effectively detected in time, the converter can stop working in time, the further damage to the converter and related devices and circuits is prevented.

The invention discloses an all-electric partial discharge detection device and detection method. The device includes a high-voltage charging unit, a capacitance matrix unit, a voltage regulating unit,an inverting unit, a power electronic switch unit, an inductance matrix unit, a measuring unit and a host system. The output terminal of the high-voltage charging unit is connected with the input terminal of the capacitance matrix unit, and the high-voltage charging unit is used for providing power for the capacitance matrix unit. The output terminal of the capacitance matrix unit is connected with the input terminal of the voltage regulating unit, and the output terminal of the voltage regulating unit is connected with the input terminal of the inverting unit. The power electronic switch unit is connected in parallel between the two output terminals of the inverting unit. One output terminal of the inverting unit is grounded, and the other output terminal is connected in series with theinductance matrix unit. The inductance matrix unit is used for being connected with a tested product. The measuring unit is connected in parallel to the two ends of the tested product. The host systemis connected with the control pole of the switching element in each unit. No additional high-power power supply is needed, and the detection efficiency can be improved.

The invention discloses a mechanical main shaft test platform. The platform comprises a plurality of main shaft fixing seats fixed on a test board, and the spindle fixing seats are used for fixing a main shaft system; the plurality of main shaft fixing seats are fixed on the test board at equal intervals, the main shaft system is fixedly arranged in the main shaft fixing seats in a penetrating manner, the main shaft system comprises a driven wheel fixed on a main shaft, a motor is arranged on the test board, an output shaft of the motor is connected with a driving wheel, the driving wheel consists of a plurality of hubs, and the driving wheel is in transmission connection with the driven wheel through a belt. According to the driving wheel composed of the multiple main shaft fixing seats and the multiple hubs, multiple main shaft systems can be installed on the test board for testing, meanwhile, one motor can drive the multiple main shaft systems to operate, cost increase caused by installation of the multiple motors is avoided, and meanwhile the size of the test board is increased. Meanwhile, an axial measuring device and a radial measuring device are further arranged on the testboard, axial movement and radial run-out generated when the main shaft operates are measured, the operation state of the mechanical main shaft in the working process is simulated, and the radial displacement and the axial displacement are accurately measured.

The invention discloses a main power supply and emergency power supply switching device having delay protection. The main power supply and emergency power supply switching device having delay protection comprises a contactor, an overload protection mechanism and a delay protection mechanism, wherein a contactor coil is connected with a main power supply, contactor armatures attract to each other when the main power supply is energized, a movable contact is driven to be connected with a contact of the main power supply, and power is supplied by the main power supply; when the main power supplyis disconnected, the contactor coil is deenergized, the contactor armatures are disconnected under an effect of a spring force, the movable contact is driven to be connected with an emergency power supply, and power is supplied by the emergency power supply; when the main power supply is recovered again, relatively large voltage fluctuation probably occurs due to unstable voltage at an initial stage of power supply recovery, equipment, particularly precious precise equipment can be damaged, at the moment, a delay protection mechanism acts, the power supply is connected in a delay way, and theprotection equipment is not damaged; and during short circuit, overcurrent and overload, the main power supply or the emergency power supply is disconnected by an overload protection mechanism, so that the equipment is protected, and no accident is ensured.

The invention discloses a material limiting device of round pipe rack type conveyor. The invention relates to a conveyor. The invention aims at providing a material limiting device of round pipe rack type converter capable of preventing damage of conveyor belt and roller. The technical scheme of the invention includes that the device comprises a gantry and a groove shape conveyor belt, the lower end of the material limiting plate is arc and is opposite with the groove bottom of the groove shape conveyor belt, the left and right sides of the arc surface at the lower end of the material limiting plate are inclined surfaces and opposite to the inclined surface of the groove shape conveyor belt, the cross slab at the top of the gantry is fixedly connected a nut, the threaded hole of the nut is opposite to the hole on the cross slab, the thread of a screw rod is matched with the thread of nut, the upper end thereof is provided with a hand wheel, the cylinder of the lower end thereof is rotatablely matched in the cross slab hole vertically connected with a baffle, and the thread body at the lower end of the cylinder of the screw rod is matched with the nut. The invention is used for transmitting bulk material.

The invention relates to the technical field of laser cutting and laser welding, and discloses a laser head lens temperature detecting system and method. The detecting system comprises a laser head, alens, a temperature sensor, a control board and a host computer, wherein the temperature sensor is used for collecting a temperature value of the lens when the laser head is working, and outputting the collected temperature value to the control board; the control board processes the received temperature value and outputs the processed temperature data to the host computer; and the host computer controls the operation of the laser head according to the received temperature data, and controls the laser head to stop working before the temperature of the lens reaches its damage value. The laser head lens temperature detecting system and method can protect the lens and the cutting head from being damaged by setting the temperature sensor, and are simple, reliable and easy to implement.

The invention relates to cutting machines, in particular to a sensing type flat panel cutting machine. The sensing type flat panel cutting machine comprises a workbench, a moving block, a cross beam, a driving device, horizontal guide rails, a mobile guide rail and a control panel. The horizontal guide rails are arranged on the two sides of the workbench, the driving device is movably connected with the workbench through the horizontal guide rail, and the cross beam is fixedly arranged in the middle of the driving device. The moving guide rail is arranged on the cross beam, and the moving block is movably connected with the cross beam through the moving guide rail. The control panel is further fixedly arranged on the side edge of the workbench, a sensor is arranged at the front end of the moving block, an alarm is arranged on the cross beam, and the sensor is connected with the alarm. According to the sensing type flat panel cutting machine, work personnel can be warned timely when a cutting mechanism is damaged, so that the cutting mechanism is replaced timely, it is guaranteed that cloth is not damaged, the cost is saved, and the function is improved.

The invention discloses an anti-damage self-protection type new energy automobile charging pile. The invention relates to the technical field of new energy vehicles. The charging pile includes a base,a detection assembly is arranged in the base; waterproof cloth is arranged on the outer side of the upper surface of the base; a buoyancy airbag is arranged at the top end of the waterproof cloth; the buoyancy air bag is fixed through a fixing clamping ring. The fixed clamping ring is connected with the lifting ring through a connecting rod; the charging pile is scientific and reasonable and safeand convenient to use, the detection assembly is arranged to detect whether it rains or not, in rainy days, the fixation of the electromagnet to the lifting ring is relieved; accumulated rainwater isintroduced into a water inlet groove through a water inlet hole; when a water level buoyancy air bag in the water inlet groove floats upwards to provide buoyancy, the buoyancy air bag continuously rises along with the continuous rising of the water level, the charging pile is prevented from being damaged by the accumulated water flow, it can be effectively guaranteed that the charging pile is notdamaged in rainy days, and the self-protection of the charging pile is achieved.

The invention provides a lateral support structure of marine equipment. The lateral support structure comprises the marine equipment arranged on an equipment base, a plurality of length-adjustable support rods and two mounting seats for mounting each support rod, wherein the equipment base is fixed on a bottom deck, and the two mounting seats are respectively arranged in a lateral position of themarine equipment and a bulkhead opposite to the position. In the lateral support structure of the marine equipment, provided by the invention, because ball hinge supports at two ends of the support rods are respectively welded on the support rod mounting seats, the lengths of the support rods are adjusted through a rotating sleeve I and a rotating sleeve II so as to enable the support rods to be supported on the side surfaces and bulkheads of the marine equipment; when a ship swings, the support rods achieve an auxiliary support effect for the marine equipment, thereby improving the rigidity of the marine equipment and reducing the equipment deformation; and when a swing load is too large, the axial force of the support rods reaches a preset value, a shear pin is cut off, and the support rods lose the auxiliary support effect, thereby avoiding the bulkheads from being locally damaged under the effect of large support force.

The invention provides a suspension type testing device and method for the water solubility of a salt rock. The device comprises a suspension unit and a sample fixing unit; the suspension unit comprises a pull rod, a first screw rod, a second screw rod and a supporting rod, wherein the top of the first screw rod is connected with one end of the pull rod; the top of the second screw rod is connected with the other end of the pull rod; the bottom end of the first screw rod and the bottom of the second screw rod are connected with the fixing unit respectively; the supporting rod is located between the pull rod and the fixing unit; the first screw rod is connected with the second screw rod; the supporting rod can move along the rod directions of the first screw rod and the second screw rod. The invention further provides the method which utilizes the device to test the water solubility of the salt rock. According to the suspension type testing device and method provided by the invention, the requirements on cavity construction parameters of a salt cavern storage cavity construction design can be met, and an actual cavity construction condition of a salt cavern underground storage can be more accurately and conveniently simulated.

The invention discloses a safety protection device of a circular pipe belt type conveyer, relating to conveying equipment and aiming at providing the safety protection device of the circular pipe belt type conveyer which can prevent a conveyer belt and an idler roller from being damaged. The safety protection device of the circular pipe belt type conveyer comprises a door frame and an orthohexagonal idler roller group, wherein the orthohexagonal idler roller group is fixed by a lower plate and an upper wobbling plate which are mutually separated; three idler rollers of the orthohexagonal idler roller group are fixed with the upper wobbling plate; the door frame which is opposite to the left side wall and the right side wall of the upper wobbling plate are respectively provided with horizontal screwed holes matched with screws; the end heads of the screws are connected with damping blocks; the upper end of the upper wobbling plate is articulated with the top of the door frame; and the left or right side wall of the door frame is provided with a proximity switch. The invention is used for conveying bulk materials.

The invention discloses a conveying vehicle used during harvesting of Chinese cabbages. The conveying vehicle comprises a carriage, wherein front supports and rear supports are mounted at the bottom of the carriage; Chinese cabbage boxes are arranged in the carriage; a first storage box is arranged on one side of the carriage; a second storage box is arranged on the other side of the carriage; a handle is mounted on the carriage; front wheels are mounted at the bottoms of the front supports; and rear wheels are mounted at the bottoms of the rear supports. The first storage box is used for placing Chinese cabbage harvesting equipment and facilitates carrying and using of the harvesting equipment; sundries such as gloves and cups are placed in the second storage box, and working and resting of workers are facilitated; the Chinese cabbage boxes are arranged in the carriage, and each Chinese cabbage is independently placed in the corresponding Chinese cabbage box, so that the circumstance that the Chinese cabbages are extruded by one another and then are damaged is avoided; the Chinese cabbage boxes are uniformly distributed in the carriage, so that the number of the harvested Chinese cabbages is convenient to calculate, and the work efficiency is improved; and mesh bags are placed in the Chinese cabbage boxes, bag openings of the mesh bags are superposed to box openings of the Chinese cabbage boxes, a packaging process is directly finished while the Chinese cabbages are harvested, and therefore, the Chinese cabbage packaging time is saved greatly.

The invention relates to a soft package battery and a manufacturing process therefor. The process comprises the following steps: manufacturing an electrical core, wherein the electrical core comprises an electrical core body and exposed a positive electrode lug and a negative electrode lug; forming a PCB connecting plate, wherein the PCB connecting plate comprises two side frames and a plurality of PCB plates connected into one body, the PCB plates are arranged in parallel, and the two ends of each PCB plate are connected with the two side frames; cutting the PCB connecting plate to cut off the materials among the PCB plates, and meanwhile, cutting the connection places between each PCB plate and the two side frames while keeping reserved connecting points, cutting the four corners of each PCB plate into chamfering, wherein the radius of the chamfering is greater than 2 mm; separating each PCB plate from the cut PCB connecting plate, taking the PCB plates out, then welding and connecting the PCB plates on the positive electrode lug and the negative electrode plate, and packaging and forming. By cutting the PCB connecting plate into multiple PCB plates, keeping the connecting points and cutting the four corners of each PCB plate into chamfering, the battery is effectively protected, the product quality is improved and the production cost is reduced.

The invention discloses a pressure-relief anti-oil-leakage protective capacitive voltage transformer device which comprises: an oil tank composite body, a lower capacitive voltage divider, a terminalboard, a support main pole, an upper capacitive voltage divider, an electromagnetic unit, and an output wiring slot. The oil tank composite body is installed under the electromagnetic unit and is fastened to the electromagnetic unit. The output wiring slot is disposed under the electromagnetic unit and is electrically connected with the electromagnetic unit. When the device is used, by means of the oil tank composite body, the problems can be avoided that when the magnetic flux on the transformer is not uniform, the high temperature causes a sealing ring in the oil tank to gradually age and thus causes an oil tank casing to expand and leak oil so as to affect the normal operation of the transformer, and that when the large current flows through the electromagnetic sleeve, the transformer is likely to generate heat and causes a great voltage drop so as to damage to components. Thus, the device can prevent the oil leakage and the structural safety of the transformer.

The invention discloses a steelmaking workshop construction operation intelligent safety alarm system and an alarm method thereof, and belongs to the technical field of safety production electronic information. The system comprises an alarm main control unit and two distance measurement sensing units. The alarm main control unit is installed in a construction operation area. The two distance measuring sensing units are installed near a feeding area and a discharging area respectively. The alarm main control unit and the distance measurement sensing units are designed in a portable mode and provided with high-temperature-resistant outer covers, damage to the equipment due to splashing of molten steel can be avoided, the system can be flexibly installed according to construction requirementswithout modification of an existing device or influence on the production process, the alarm information is transmitted through wireless communication, alarming is performed in various alarm modes through the alarm main control unit, effective alarming is performed and manpower consumption is reduced. Besides, the construction operation area is provided with the image acquisition device bound with the alarm main control unit so that secondary alarm can be performed under necessary conditions when people are not evacuated in time in the construction operation area, and evacuation of all peoplecan be guaranteed.

The invention relates to the field of semiconductor packaging, and discloses a chip welding structure and a welding method. The chip welding structure comprises a substrate, a first chip, a first goldwelding spot and a first copper connecting wire, wherein the first chip is arranged on the substrate, the first gold welding spot is arranged on the first chip, and the two ends of the first copper connecting wire are connected with the first chip and the substrate respectively. According to the chip welding structure, a gold welding spot is formed on the chip by using a gold wire made of a softmaterial, impact force on the chip is small, and the internal structure of the chip is not easy to damage; a copper wire is adopted to form the first copper connecting wire, the two ends of the firstcopper connecting wire are connected with the gold welding spot and the substrate respectively, so that the chip and the substrate are electrically communicated; and due to buffering of the gold welding spot, impact force on the chip during copper wire welding is effectively reduced, it is guaranteed that the chip structure is not damaged, and meanwhile, the production cost during chip packaging is reduced.

The invention discloses an intelligent logistics trolley carrying auxiliary device with a reinforced fixing function, and relates to the technical field of logistics equipment. The intelligent logistics trolley carrying auxiliary device comprises a conveying belt; the upper end of the inner wall of the conveying belt is rotationally connected with a first transmission roller; the centers of the left side face and the right side face of the first transmission roller are fixedly connected with a first supporting shaft in a penetrating mode; the lower end of the inner wall of the conveying belt is rotationally connected with a second transmission roller; a second supporting shaft is fixedly connected to the left side face and the right side face of the second transmission roller in a penetrating mode; a first connecting shaft is fixedly connected to the right side face of the conveying belt; a connecting rod is fixedly connected to the right side face of the first connecting shaft; a connecting plate is fixedly connected to the upper end of the left side face of the connecting rod; and a spring telescopic rod is fixedly connected to the front side face of the connecting plate. The technical problems that when heavy goods with large size are conveyed, due to inclination of a conveying face, the goods are prone to slipping or rollover to be collided and damaged when placed on the transmission roller, the goods cannot be stably conveyed along with the transmission roller, manual supporting is needed, and using is inconvenient are solved.

The invention provides a lateral support structure of marine equipment. The lateral support structure comprises the marine equipment arranged on an equipment base, a plurality of length-adjustable support rods and two mounting seats for mounting each support rod, wherein the equipment base is fixed on a bottom deck, and the two mounting seats are respectively arranged in a lateral position of themarine equipment and a bulkhead opposite to the position. In the lateral support structure of the marine equipment, provided by the invention, because ball hinge supports at two ends of the support rods are respectively welded on the support rod mounting seats, the lengths of the support rods are adjusted through a rotating sleeve I and a rotating sleeve II so as to enable the support rods to be supported on the side surfaces and bulkheads of the marine equipment; when a ship swings, the support rods achieve an auxiliary support effect for the marine equipment, thereby improving the rigidity of the marine equipment and reducing the equipment deformation; and when a swing load is too large, the axial force of the support rods reaches a preset value, a shear pin is cut off, and the support rods lose the auxiliary support effect, thereby avoiding the bulkheads from being locally damaged under the effect of large support force.

The invention discloses a bridge inhaul cable surface detection device which comprises an annular support and an image acquisition device, the annular support comprises a mounting plate, a first hoopplate and a second hoop plate, a plurality of rolling wheels are arranged in the circumferential direction of the annular support, and when the annular support is arranged on an inhaul cable in a sleeving mode, the rolling wheels abut against the outer surface of the inhaul cable; the image acquisition devices are arranged on the inner side wall of the annular support, and the multiple image acquisition devices are arranged in the circumferential direction of the annular support. The inhaul cable surface image is collected through the image collecting devices, electric energy and signal transmission is conducted through the anti-interference cable, the image is checked and recognized through the artificial intelligence technology, and compared with manual detection, the detection process is faster, operation is easy, workers do not need to work high above the ground, safety is high, and the detection result is more reliable.

The invention relates to a damaging and protecting device of a voltage convertor of an electric vehicle, wherein a protective device is arranged between a convertor and an auxiliary electric appliance. The protective device is formed by a fuse, a relay and a plurality of wires wherein the fuse is connected on a high level of the output of the convertor in series, the relay is connected on the output end of the fuse, and is connected with the convertor in parallel, once the convertor is damaged and the output voltage reaches or exceeds 48V after using, the protective device can rapidly work and automatically cut off external output of the convertor, thereby playing the function of preventing auxiliary electric appliances from being damaged.

The invention discloses a pressure-relief anti-oil-leakage protective capacitive voltage transformer device which comprises: an oil tank composite body, a lower capacitive voltage divider, a terminalboard, a support main pole, an upper capacitive voltage divider, an electromagnetic unit, and an output wiring slot. The oil tank composite body is installed under the electromagnetic unit and is fastened to the electromagnetic unit. The output wiring slot is disposed under the electromagnetic unit and is electrically connected with the electromagnetic unit. When the device is used, by means of the oil tank composite body, the problems can be avoided that when the magnetic flux on the transformer is not uniform, the high temperature causes a sealing ring in the oil tank to gradually age and thus causes an oil tank casing to expand and leak oil so as to affect the normal operation of the transformer, and that when the large current flows through the electromagnetic sleeve, the transformer is likely to generate heat and causes a great voltage drop so as to damage to components. Thus, the device can prevent the oil leakage and the structural safety of the transformer.

The invention provides a foam bottom plate facilitating loading, unloading and transportation of an integrated electric appliance. The foam bottom plate comprises a foam plate, supporting legs are arranged on the left and right sides of the bottom of the foam plate, a space for a forklift arm to pass through is formed between the supporting legs on the left and right sides, and a strip-shaped sheet metal part is arranged at the bottom of the foam plate and between the supporting legs on the left and right sides. The sheet metal part is embedded on the foam plate. The problem that the foam plate is quite likely to damage when the integrated electric appliance is loaded, unloaded and transported. The foam bottom plate is simple and reasonable in structure and high in strength, and can assist the integrated electric appliance from being damaged and protect the integrated electric appliance in the process of loading, unloading and transporting the integrated electric appliance.

The invention relates to the technical field of mobile phone software automatic testing, and discloses an automatic testing device for a mobile phone software. The device comprises a detection box, aside plate is fixedly installed on one side of the detection box, supporting plates are fixedly installed on the front side and the rear side of the top of the side plate, and the upper portions of the supporting plates are movably sleeved with movable rods. A fixed plate is fixedly installed at the rear ends of the movable rods, the rear sides of the movable rods are movably sleeved with a firstspring, and the two ends of the first spring are fixedly provided with the fixed plate and the supporting plates correspondingly. According to the automatic testing device for the mobile phone software, the side plate, the supporting plates and the fixing plate are arranged on one side of the detection box, the fixing plate and the supporting plates are connected through the first springs, the mobile phone is conveniently clamped in an inner cavity of the fixing plate due to the elasticity of the first springs, and the stability of connection between the mobile phone and a mobile phone connector is improved; and the mobile phone is prevented from falling onto the ground and being damaged when the mobile phone is collided by the outside.

The invention relates to a slip casting pressure gauge pedestal device comprising a pedestal body. The pedestal body is provided with a first side and a second side, which are in an opposite arrangement. The pedestal body is provided with a first chamber transversely penetrating the first side and the second side of the pedestal body. The first chamber is provided with a first opening facing the direction, which is the same as the direction of the pedestal body, and a second opening facing the direction, which is the same as the direction of the pedestal body. The upper end of the pedestal body is provided with a second chamber penetrating the first chamber; an elastic capsule disposed in the first chamber; a pressure-transmitting medium accommodated in the second chamber; pressing covers, which are respectively disposed on the first side and the second side of the pedestal body; a first pipeline disposed on the first side of the pedestal body; and a second pipeline disposed on the second side of the pedestal body. The slip casting pressure gauge pedestal device is advantageous in that the pressure transmission data is accurate, the pressure-bearing capability is strong, and the service lifetime is long.

The invention provides a high-torque ultrasonic motor driving system based on an SoC. The system comprises an SoC controller, a first driving module, a second driving module, a first transformer, a second transformer, an ultrasonic motor and a steady-state voltage feedback circuit, wherein the output end of the SoC controller is connected with the input ends of the first driving module and the second driving module, the output end of the first driving module is connected with the input end of the first transformer, the output end of the second driving module is connected with the input end ofthe second transformer, the output ends of the first transformer and the second transformer are connected to three input ends of the ultrasonic motor, the input end of the steady-state voltage feedback circuit is connected with the ultrasonic motor, and the output ends of the steady-state voltage feedback circuit are separately connected to the first transformer and the second transformer. Thereby, the ultrasonic motor can be started smoothly and operated steadily.

The invention provides a load protection circuit and an air conditioner and relates to the technical field of a switching power source. The load protection circuit includes a voltage detection moduleand a switch module, and the voltage detection module is electrically connected to the switch module; the voltage detection module is configured to enter a self-locking state when received first inputvoltage is greater than or equal to a preset voltage protection threshold value to keep the switch module in an off state; as the voltage of a three-phase electric current is higher than the voltageof a single-phase electric current, the first input voltage received via the voltage detection module is greater than or equal to the preset voltage protection threshold value when the three-phase electric current is misconnected, thus the voltage detection module enters the self-locking state, no voltage signal is output, a controller can be prevented from being damaged when the three-phase electric current is misconnected, the switch module can be prevented from having working voltage, thus a disconnected state can be maintained so as to cut off the connection between the power source and aload motor, and that the load motor cannot be damaged can be ensured.