155results about How to "Avoid runaway phenomena" patented technology

The invention provides a high-pressure safety electric interlocking mechanism of an electro-mobile, a control method and an electro-mobile. The mechanism comprises a complete vehicle controller, a first low voltage relay, a collision switch, a high voltage relay, a high voltage connector with an interlocking structure and a power battery system controller, wherein the complete vehicle controller is respectively connected with the control end of the first low voltage relay and a power battery system controller; the first low voltage relay, a load, the high voltage connector and the power battery system controller are sequentially connected to form a high voltage safety electric interlocking loop; the complete vehicle controller controls the first low voltage relay to switch on / off a drive voltage source and detect the on and off states of the high voltage safety electric interlocking loop, and the on and off of a high voltage relay is controlled by the power battery system controller. According to the high-pressure safety electric interlocking mechanism provided by the invention, the monitoring and control of the high voltage safety electric interlocking loop can be realized by the complete vehicle controller, the out of control phenomenon of endangering personnel and vehicles can be prevented, the control performance of a complete vehicle can be improved, and the reliability of the operation of the complete vehicle can be promoted.

The invention discloses an electric vehicle high-voltage loop safe control method and device. The method comprises the steps that whether a charging cover is accidentally opened or not in the vehicle running process is judged through a vehicle control unit according to charging cover opening state real-time detection results; when it is judged that the charging cover is accidentally opened in the vehicle running process by the vehicle control unit, a high-voltage loop is kept being in a closed state so that a vehicle can run; and in the period that the high-voltage loop is kept being in the closed state, the vehicle control unit detects the vehicle running speed and switches the high-voltage loop to the open state after it is detected that the vehicle speed is decreased to zero. Through the electric vehicle high-voltage loop safe control method and device, the out-of-control phenomenon that a charging cover is accidentally (due to mechanical vibration impact and the like) opened and endangers persons and vehicles in the vehicle running process is avoided, the vehicle control performance is improved, and the vehicle operation reliability is improved.

The invention discloses a sewage rate tracking coordination optimizing control method based on the internet and a system thereof. A plurality of relative drainage pumping stations distributed in a drainage system of the city are connected with a central control unit through the internet, under the control of the comprehensive coordination optimizing drainage in wide zones, the whole drainage system realizes the operation with excellent efficiency and minimum energy consumption, and can ensure that the system realizes that sewage can not exceed the management and the best electricity conservation as well as the resource conservation drainage control under uncommon conditions such as raining, sudden inrush current and the like; the pumping stations adopt a reserve site to automatically switch and control, thereby avoiding the incontrollable phenomenon of the drainage system caused by the deficiency of the global coordinated control command when the network is intermitted and maintained or the central control unit is in failure, and realizing that the pumping stations drain sewage safely with unattended operation.

The invention relates to an electric motor car controller comprising a power interface, a control circuit and a motor signal interface, wherein the control circuit comprises an undervoltage protection circuit, a charging state detection circuit, a rolling handle input circuit, a rolling handle failure protective circuit, a power tube breakdown detection circuit, an electrified time sequence protective circuit, a relay, a current-limiting detection circuit of current, a PWM (Pulse-Width Modulation) control circuit, a power tube driver circuit, a power tube voltage-stabilizing protective circuit and a power tube. With the undervoltage protection circuit, the invention avoids the damage caused by overdischarge of the storage battery; with the power tube breakdown detection circuit and a rolling handle state detection circuit, the invention avoids the runaway generated by relay adhesion, PWM modulation chip damage, power tube driver circuit damage and broken-down faults of the power tube and can better effectively control the motor. In addition, the invention can self-diagnose electric faults, solves the problem of eliminating low fault speed and has low fault rate and easier debugging and modification.

The invention relates to a braking method of an electronic parking braking system, the electronic parking braking system and a vehicle. The braking method includes the steps that when a first wheel speed sensor of a wheel loses efficacy, a wheel speed signal is acquired from a second wheel speed sensor, which normally works, of the wheel, and wheel speed signals of other wheels of the vehicle are acquired; the slip rate of each wheel is acquired according to the wheel speed signals of the wheels; and the clamping force of brake calipers of the wheels is adjusted if the slip rate of the wheels is not within a preset range, so that the slip rate of the wheels is adjusted to be within the preset range. By means of the braking method, the vehicle is kept stable in dynamic braking, and the phenomenon that the vehicle is out of control in the braking process is effectively prevented.

The invention discloses a movable cover controlling device, belonging to the field of an electric heating cooking appliance used for a kitchen. The movable cover controlling device adopts a pressure control way and works within a normal pressure range. The movable cover controlling device comprises a pot cover part, a pot body part, an inner pot and an electric heating disc, wherein a control mechanism is arranged at one side of the connecting part between the pot cover part and the pot body part, and comprises a transmission piece and a switch; the transmission piece used for transmitting the displacement force or the gravity of the pot cover part is arranged correspondingly to the switch up and down; a supporting point mechanism is positioned at the other side of the connecting part between the pot cover part and the pot body part, and comprises a fixing piece and a buckling inserting piece which are respectively arranged on the pot cover part and the pot body part; and the fixing piece and the buckling inserting piece are combined with each other, so that the pot cover part can make opening and closing displacement by taking a combining point of the fixing piece and the buckling inserting piece as a supporting point. The movable cover controlling device solves the problems of high power consumption, single function, poor cooking effect and the like in the prior art, and has the advantages of being simple in structure, saving production cost, being low in probability of failure, and the like.

The invention discloses a digital negative ion generator, which comprises a power conversion circuit, a main controller, a voltage conversion circuit, a protection circuit and a negative high voltage feedback circuit, wherein the power conversion circuit is composed of an LC half-bridge resonant circuit, a piezoelectric ceramic transformer and a double voltage circuit connected in sequence; the protection circuit comprises an overcurrent protection circuit and an overheat protection circuit; the negative high voltage feedback circuit is composed of a bleeder circuit, a half wave rectification circuit and a voltage amplitude limiting circuit connected in sequence; the input end of the main controller is also connected with an A / D conversion circuit; the input end of the A / D conversion circuit is also connected with a specified voltage circuit; the output end of the main controller is connected with a driving circuit; and the LC half-bridge resonant circuit is connected with the output end of the driving circuit. The invention also discloses a digital negative ion generator control method. The design is novel and reasonable, work reliability is high, functions are complete, the fault rate is low, maintainability is high, practicability is high, and promotion and use are facilitated.

The invention discloses a medical automatic guided vehicle (AGV) control system, which comprises a processor unit, a controller, a first motor, a second motor, a signal processor, an AGV trolley, a logistics inlet / outlet station and a logistics master station, wherein the controller respectively communicates with the logistics inlet / outlet station and the logistics master station; the processor unit transmits a control signal to the controller; the control signal is divided into a first driving signal and a second driving signal through the controller; the first driving signal and the second driving signal respectively control the second motor and the first motor; and the second driving signal passing through the first motor and the first driving signal passing through the second motor are synthesized through the signal processor and control the AGV trolley to move. According to the medical AGV control system, the problems of the out-of-control AGV trolley phenomenon and low interface resistance in the prior art are solved.

The invention relates to the technical field of loop switching, in particular to a constant-voltage constant-current loop control system and a control method thereof, the constant-voltage constant-current loop control system comprises an external loop, a comparator and an internal loop, the external loop comprises a voltage loop and a current loop, and the internal loop comprises an inductance current loop; the input end of the comparator is electrically connected with the output end of the voltage loop and the output end of the current loop, the output end of the comparator is electrically connected with the input end of the inductive current loop, and the output end of the inductive current loop is electrically connected with an external actuating mechanism. By arranging the voltage loop, the current loop and the comparator, the comparator judges the output voltage value of the voltage loop and the output current value of the current loop, so that the smaller value of the output voltage value of the voltage loop and the output current value of the current loop of the outer loop can be extracted and input into the inductance current loop to serve as the integral upper and lower limit amplitude limiting value of the non-effective loop. In this way, the out-of-control phenomenon that when the loops are switched, the uneffective loops enter the effective stage can be effectivelyavoided.

According to the technical scheme, the invention discloses an anti-explosion safety tire. The tire comprises a solid tire body, shock absorption cavities are formed in the tire body in the radial direction, the shock absorption cavities penetrate through the inner side face of the tire body, gaps are reserved between the shock absorption cavities and the outer side wall of the tire body, and the multiple shock absorption cavities are arranged at intervals in the circumferential direction of the tire body and distributed in the axial direction of the tire body. Shock force and noise of a vehicle in the running process are decomposed and sharply reduced through the spherical shock absorption containing cavities. Even if the tire is punctured by external force, all the spherical containing cavities also play the role of spheres, and the phenomenon that a punctured tire is out of control is avoided.

A six-wheel drive type low-speed all-weather driverless patrol car system comprises a patrol car body and a control system. The patrol car body comprises two pairs of front and rear driving wheels, and each pair of the driving wheels is driven by six direct-current motors in connection with planetary reducers. Each of first front and rear environmental detection and protection systems in the control system mainly comprises a first single-line radar, a second single-line radar and a CCD camera; each of second front and rear environmental detection and protection systems mainly comprises two microwave radars. Each of front and rear blind area detection and obstacle avoidance systems comprises three ultrasonic sensors. The single-line radars, the microwave radars, a wireless communication module, the CCD cameras and an auxiliary controller are all connected with a master controller. The ultrasonic sensors and a motor driver are connected with the auxiliary controller, and the motor driveris connected with the six direct-current motors. The six-wheel drive type low-speed all-weather driverless patrol car system is high in stability, reliability, cost performance, operation processingspeed and flexibility and effective in coping with severe weather.

The invention discloses a lightning surge simulation device comprising a charging unit, an energy storage unit, a gap switch unit, at least one first wave-modulated resistor, a second wave-modulated resistor, an inductor, a non-gap adaptive Crowbar switch unit, and a carrier for to-be-tested objects. The charging unit is connected to the energy storage unit. The non-gap adaptive Crowbar switch unit and the second wave-modulated resistor, which are connected in series, are connected in parallel with the energy storage unit and are disposed between the inductor on one hand and the gap switch unit and the at least one first wave-modulated resistor which are connected in series on the other hand. The non-gap adaptive Crowbar switch unit includes a high-voltage fast pulse semiconductor assembly and a support frame. The high-voltage fast pulse semiconductor assembly is composed of a first diode, a second diode, and a connecting plate. Long-tail waveform can be output at low capacitance. The lightning shock simulation device can be applied to class-I lightning waveform, long-tail surge current wave, and A wave and D wave of direct lightning waveform. The utilization efficiency of capacitance is improved.

A six-wheel drive type high-speed all-weather driverless patrol car system comprises a patrol car body and a control system. The patrol car body comprises two pairs of front and rear driving wheels, and each pair of the driving wheels is driven by six direct-current motors in connection with planetary reducers. Each of first front and rear environmental detection and protection systems in the control system mainly comprises a first single-line radar, a second single-line radar and a CCD camera; each of second front and rear environmental detection and protection systems mainly comprises two microwave radars. Each of front and rear blind area detection and obstacle avoidance systems comprises three ultrasonic sensors. The single-line radars, the microwave radars, the CCD cameras and a firstauxiliary controller are all connected with a master controller. The ultrasonic sensors and a motor driver are connected with the first auxiliary controller and a second auxiliary controller respectively, and the motor driver is connected with the six direct-current motors. The six-wheel drive type high-speed all-weather driverless patrol car system is high in stability, reliability, cost performance, operation processing speed and flexibility and effective in coping with severe weather and has a function of fast traveling.

The invention discloses a lightning current surge test bench comprising a charging unit, an energy storage unit, a gap switch unit, at least one first wave-modulated resistor, a second wave-modulated resistor, an inductor, a non-gap adaptive Crowbar switch unit, and a carrier for to-be-tested objects. The charging unit is connected to the energy storage unit. The non-gap adaptive Crowbar switch unit and the second wave-modulated resistor, which are connected in series, are connected in parallel with the energy storage unit and are disposed between the inductor on one hand and the gap switch unit and the at least one first wave-modulated resistor which are connected in series on the other hand. The non-gap adaptive Crowbar switch unit includes a high-voltage fast pulse semiconductor assembly and a support frame. A connecting plate is composed of a steel plate layer and copper conductive layers disposed on the upper and lower surfaces of the steel plate layer. An open-circuit resistor is connected across the other end of the inductor and the low-voltage end of the carrier for to-be-tested objects. The lightning current surge test bench of the invention can be applied to class-I lightning waveform, long-tail surge current wave, and A wave and D wave of direct lightning waveform. The utilization efficiency of capacitance is improved. No peak shock is generated. The waveform is smooth.

The invention discloses a vehicle explosion-proof battery scheme and system. The scheme comprises the following steps: S10, judging whether a battery management system is in a wake-up state, if yes, carrying out S20, and if not, carrying out S30; S20, judging whether the information, such as the single battery pack voltage, the temperature and the battery pack air pressure sent by a slave board reaches a safety threshold value point or not through the battery management system mainboard, if so, carrying out S21, and if not, returning to the S10; S30, detecting whether the air pressure in the battery pack reaches a safety threshold point or not through an air pressure sensor, if so, executing S40, and if not, returning to the S10; and S40, opening a fire hydrant, and performing rapid fire extinguishing and cooling work on the on-fire battery pack. Key parameters such as air pressure, insulation resistance, temperature and current are monitored in real time through the battery management system in the control strategy level, fault processing is carried out when a power battery system is abnormal, and a fire hydrant can be actively opened to prevent thermal runaway spreading of a battery pack when thermal runaway happens to the battery system.

The invention relates to a large-scale excavator motor, which includes a casing, a stator, a rotor, a fan, a windshield and a storage battery. A rotating shaft is arranged in the middle of the casing, the stator is arranged outside the rotor, and One end is provided with a baffle, one side of the baffle is provided with the fan, the other side of the baffle is provided with the stator and the rotor, and the windshield is provided outside the fan, so The storage battery is arranged below the fan, the outer wall of the housing is radially distributed with cooling ribs, the cooling ribs are covered with an outer cover plate, and the outer cover plate is provided with cooling grooves and cooling holes. A cooling fin is provided, and the cooling fin and the cooling hole are arranged in a dislocation manner. The motor designed by the invention can effectively avoid the occurrence of the circuit burning problem caused by excessive temperature, thereby greatly improving the safety and stability of the large excavator.

The invention relates to a solar energy automobile motor which comprises a housing, a stator, a rotor, a fan, an air cover and a storage battery. The middle part of the housing is provided with a rotating shaft. The stator is arranged outside the rotor. One end in the housing is provided with a separator plate. One side of the separator plate is provided with the fan, and the other side is provided with the stator and the rotor. The air cover is arranged outside the fan. The storage battery is arranged below the fan. Heat radiating fins are radially arranged on the outer wall of the housing. An outer cover board covers the heat radiating fins. The outer cover board is provided with heat radiating troughs and heat radiating holes. Heat radiating plates are arranged in the heat radiating troughs. The heat radiating plates and the heat radiating holes are arranged in a staggered manner. The solar energy automobile motor can effectively prevent line burndown caused by overhigh temperature, thereby greatly improving safety and stability in use of the solar energy automobile.

The invention discloses a multi-rotor aircraft, comprising a duct, a main rotor and a plurality of auxiliary rotors. The main rotor is located on the inside of the duct, and the aileron is uniformly distributed on the periphery of the duct. The main rotor comprises an upper propeller, a lower propeller and a main driving mechanism coaxially arranged, wherein the main driving mechanism is located at a central position on the inner side of the duct, and the upper propeller and the lower propeller are respectively fixed to the top end and the bottom end of the main driving mechanism by a supporting device, and the rotational direction is opposite. The auxiliary rotor comprises an auxiliary propeller, an arm and an auxiliary drive mechanism. One end of the arm is connected with a support device, the other end of the arm is fixedly connected with the auxiliary drive mechanism, and the auxiliary propeller is mounted on the top end of the auxiliary drive mechanism. The invention discloses a multi-rotor aircraft with simple structure, which can adjust the size according to specific conditions and improve flight efficiency.

The invention relates to a six-wheel-driven all-weather unmanned patrol vehicle system. The six-wheel-driven all-weather unmanned patrol vehicle system comprises a patrol vehicle body and a control system; the patrol vehicle body is provided with two pairs of front and rear driving wheels; a pair of driving wheels can be driven by six direct-current motors; the direct-current motors are connectedto a planetary decelerator; both first front and rear environment detection and protection systems in the control system are each mainly composed of a single-line laser radar, a single-line laser radar and a CCD camera; second front and rear environment detection and protection systems are each mainly composed of two microwave radars; front and rear blind area detection and obstacle avoidance systems are each composed of three ultrasonic sensors; the single-line laser radar, the microwave radar, a wireless communication module, the CCD camera, a wireless communication module and an auxiliary controller are connected with a main controller; both the ultrasonic sensor and a motor driver are connected with the auxiliary controller; and the motor driver is separately connected with the six direct-current motors. The system is high stability, reliability, cost performance and flexibility and rapid in arithmetic processing speed, and can effectively deal with a bad weather.

The invention relates to an impact type piling machine motor comprising a housing, a stator, a rotor, a fan, a fan cover and a storage battery; a rotary shaft is arranged in middle of the housing; the stator is arranged outside the rotor; a separation board is arranged on one end in the housing; the fan is arranged on one side of the separation board; the stator and rotor are arranged on the other side of the separation board; the fan cover is arranged outside the fan; the storage battery is arranged below the fan; the housing outer wall is radially distributed with radiating ribs; a cover plate is arranged outside the radiating ribs, and provided with radiating grooves and radiating holes; radiating fins are arranged in the radiating grooves; the radiating fins and the radiating holes are arranged in a staggering manner. The impact type piling machine motor can effectively solve the line burning problems caused by over high temperature, thus greatly improving the impact type piling machine usage safety and stability.

The invention discloses a novel unmanned aerial vehicle handle and a using method thereof, and belongs to the field of unmanned aerial vehicles, the novel unmanned aerial vehicle handle comprises a control handle, a pair of rocker ball grooves are formed in the upper end of the control handle, and rocker control assemblies are arranged in the rocker ball grooves; the upper end of the control handle is provided with a starting return button located in the rear sides of the rocker control assemblies, the upper end of the control handle is provided with a grade speed button set, the grade speed button set is located between the two rocker control assemblies, and by arranging the two rocker control assemblies, a controller must control the unmanned aerial vehicle to fly with the two hands; the control stability of the unmanned aerial vehicle is effectively improved, the out-of-control phenomenon caused by too large single-hand control amplitude is effectively avoided, the operation difficulty of the control handle is reduced, constant control over the flight speed of the unmanned aerial vehicle is effectively achieved through the grade speed button set, the control difficulty of the unmanned aerial vehicle is reduced, operation is easy and convenient, and use of a green hand is facilitated.

The invention relates to a wall-attached external elevator motor, which includes a housing, a stator, a rotor, a fan, a wind cover and a storage battery, a rotating shaft is arranged in the middle of the housing, the stator is arranged outside the rotor, and the One end of the interior is provided with a baffle, one side of the baffle is provided with the fan, the other side of the baffle is provided with the stator and the rotor, and the windshield is provided outside the fan , the storage battery is located below the fan, the outer wall of the housing is radially distributed with cooling ribs, the cooling ribs are covered with an outer cover plate, and the outer cover plate is provided with cooling grooves and cooling holes. Radiating fins are arranged in the slots, and the fins are arranged in a dislocation manner with the cooling holes. The motor designed by the invention can effectively avoid the occurrence of circuit burnout caused by excessive temperature, thereby greatly improving the safety and stability of the wall-attached external elevator.

The invention discloses a double-drive double-bearing type racing car which comprises a car body, two driving wheels, two driven wheels, an electric motor, a cantilever A, a cantilever B and a car shaft, wherein the driving wheels are respectively arranged at the left and right sides of the car body along the same axial direction; the two driven wheels and the two driving wheels are respectively arranged at the same side; the car shaft is located at the middle part of the bottom of the car body; the driving wheels are connected with an electric motor shaft in a manner of key connection, the electric motor shaft is fixedly connected to the cantilever A, and the driving wheels rotate along with the electric motor; and the driven wheels are movably connected with the car shaft through the cantilever B. In the double-drive double-bearing type racing car disclosed by the invention, the driving wheels and the driven wheels at the same side of the car body are fixedly connected in a flexiblemanner of separated connection, so that no interference exists between height position states of the driving wheels and the driven wheels, and the out-of-control phenomenon of the racing car due to the unevenness of the ground is avoided.

The invention relates to an electric motor car controller comprising a power interface, a control circuit and a motor signal interface, wherein the control circuit comprises an undervoltage protection circuit, a charging state detection circuit, a rolling handle input circuit, a rolling handle failure protective circuit, a power tube breakdown detection circuit, an electrified time sequence protective circuit, a relay, a current-limiting detection circuit of current, a PWM (Pulse-Width Modulation) control circuit, a power tube driver circuit, a power tube voltage-stabilizing protective circuit and a power tube. With the undervoltage protection circuit, the invention avoids the damage caused by overdischarge of the storage battery; with the power tube breakdown detection circuit and a rolling handle state detection circuit, the invention avoids the runaway generated by relay adhesion, PWM modulation chip damage, power tube driver circuit damage and broken-down faults of the power tube and can better effectively control the motor. In addition, the invention can self-diagnose electric faults, solves the problem of eliminating low fault speed and has low fault rate and easier debugging and modification.

The invention relates to a steel cage roll welding machine motor, which includes a casing, a stator, a rotor, a fan, a wind cover and a storage battery, a rotating shaft is arranged in the middle of the casing, the stator is arranged outside the rotor, and the casing One end of the interior is provided with a baffle, one side of the baffle is provided with the fan, the other side of the baffle is provided with the stator and the rotor, and the windshield is provided outside the fan , the storage battery is located below the fan, the outer wall of the housing is radially distributed with cooling ribs, the cooling ribs are covered with an outer cover plate, and the outer cover plate is provided with cooling grooves and cooling holes. Radiating fins are arranged in the slots, and the fins are arranged in a dislocation manner with the cooling holes. The motor designed by the invention can effectively avoid the occurrence of circuit burnout caused by excessive temperature, thereby greatly improving the safety and stability of the steel cage roll welding machine.

The invention discloses an equipment control method and device, a wireless communication module and a multimedia player. The method comprises the steps that the wireless network connection state of a wireless communication module and target equipment is acquired, the target equipment comprises wireless local area network broadcasting equipment, the wireless communication module is currently in a first mode, and the first mode comprises a station mode; under the condition that the wireless network connection state meets the preset condition, the wireless communication module is switched from the first mode to a second mode, and the second mode comprises a wireless access point mode. According to the invention, the technical problem of easy out-of-control in the process of controlling the mode switching of the wireless communication module by a user is solved.

The invention relates to a motor of an inflight meal loader transporter. The motor comprises a shell, a stator, a rotor, a fan, a fan cover and a storage battery, a rotating shaft is arranged in the middle of the shell, and the stator is arranged at the outer side of the rotor; a partition plate is arranged at one end in the shell, the fan is arranged on one side of the partition plate, and the stator and the rotor are arranged at the other side of the partition plate; the fan cover is arranged at the outer side of the fan, the storage battery is arranged below the fan, and the heat dissipation ribs are distributed on the outer wall of the shell in a radial direction; an outer cover plate covers the heat dissipation ribs, the heat dissipation grooves and the heat dissipation holes are arranged on the outer cover plate, the heat dissipation fins are arranged in the heat dissipation grooves, and the heat dissipation fins and the heat dissipation holes are arranged in a staggered manner.Through the motor designed by the invention, the problem of the circuit burnout caused by the over-high temperature can be effectively avoided, so that the use safety and stability of the inflight meal loader transporter are greatly improved.

The invention relates to an internal combustion rock drill motor, which includes a casing, a stator, a rotor, a fan, a wind cover and a storage battery. A rotating shaft is arranged in the middle of the casing, the stator is arranged outside the rotor, and one end inside the casing A baffle is provided, the fan is provided on one side of the baffle, the stator and the rotor are provided on the other side of the baffle, the windshield is provided on the outside of the fan, the The storage battery is arranged below the fan, and heat dissipation ribs are radially distributed on the outer wall of the housing. The heat dissipation ribs are covered with an outer cover plate, and the outer cover plate is provided with heat dissipation grooves and heat dissipation holes. There are heat dissipation fins, and the heat dissipation fins are arranged in a dislocation manner with the heat dissipation holes. The motor designed by the invention can effectively avoid the occurrence of circuit burnout caused by excessive temperature, thereby greatly improving the safety and stability of the internal combustion rock drill.

The invention discloses a lifting device. The lifting device comprises a base. A supporting mechanism, a lifting mechanism and a safety protection mechanism are arranged on the upper surface of the base. A fixed mounting mechanism is arranged on the lower surface of the base. The supporting mechanism is composed of a set of stand columns arranged on the upper surface of the base, rectangular grooves formed in two opposite inner side surfaces in the set of stand columns correspondingly, first telescopic motors arranged on the inner lower surfaces of the rectangular grooves, lifting blocks arranged at the telescopic ends of the first telescopic motors, round grooves formed in two opposite side faces of the lifting blocks, first bearings arranged in the round grooves, rotary rods inserted in the set of first bearings, hoisting shafts arranged on the rotary rods in a sleeving mode, and anti-slip sleeves arranged on the outer surfaces of the hoisting shafts in a sleeving mode. A PLC control system is arranged on the side surface of the base and electrically connected with the supporting mechanism, the lifting mechanism and the safety protection mechanism. The lifting device has the beneficial effects of being high in safety and practicability.