52results about How to "Flexible parameter setting" patented technology

The invention discloses a laser detector, including the machine body, the laser detection head, the laser controller, the level mobile device, and the fixture part, and the said laser detection head and the laser controller are installed in the machine body, the level mobile device installed between the laser transmitter and the laser receiver on the main supporting board of the machine body, and the fixture part connecting with the level mobile device, which can left and right move with the driven of the level mobile device, and the fixture part has the rotating pair rotors, the groove formed between the rotors is used to place the detected products. The laser diameter detector also includes the control device to control the said laser detection head, the laser controller, the level mobile device, and movement of the fixture part. The invention can detect the diameter and beating value of the shaft units, with high detection speed and accuracy, to solve the difficulty the traditional manual detection, which is slow and low accuracy, and it has the multi-function detection, flexible parameter setting, easy and convenient operation, and this invention can meet the great demand for OA production industry, with the broad market and higher economic benefit.

A laser detecting instrument is disclosed that comprises body, laser head, mechanical arm, delivery device, material receiving device, detecting clamping fixture, laser controller. Said laser head is mounted on the laser lifting device which can make the laser head move along the direction of the Z axis, the laser lifting device is mounted on the body supporting plate, the delivery device, the material receiving device and the detecting clamping fixture are also mounted on the body supporting plate, the mechanical arm includes the mechanical fingers, the Y axis supporting device, the Z axis supporting device, and the mechanical fingers mounted on the Y axis supporting device which makes the mechanical fingers move along the direction of the Y axis, the Y axis supporting device is mounted on the Z axis supporting device which is mounted on the body supporting plate to support the whole mechanical arm. The laser detecting instrument includes the control device which controls the movement of said laser head, the laser controller, the mechanical arm, the delivery device, the material receiving device, the detecting clamping fixture. The invention has high precision in detection, fast speed, flexible setting for parameters, simple and convenient operation, and it has the large market and good economic benefit.

The invention mainly discloses a numerical control system for a water jet loom, which mainly comprises a singlechip, a contactor module, a photoelectric weft detection module, an encoder module, a weft accumulator module and a diversion valve and thread clamper output module, wherein the contactor module receives control signals of the singlechip and controls the work states of a main shaft motor and a moisture absorption motor of the water jet loom through controlling the opening and the closing of the contactor module, the photoelectric weft detection module comprises a photoelectric probe for detecting the weft thread state, weft thread signals are input into the counter door control end of the singlechip through an amplification circuit, the encoder module collects signals of an encoder arranged on the main shaft of the water jet loom, one path of processed encoding signals is transmitted into the singlechip, the other path of the processed encoding signals is transmitted to an electronic let-off and electronic take-up system of the water jet loom, the weft accumulator module transmits weft accumulation signals in a singlechip onto a weft accumulator, and the diversion valve and thread clamper output module respectively transmit diversion signals and thread clamp signals in the singlechip onto a diversion valve and a thread clamper. The numerical control system disclosed by the invention coordinates the integral work of the main shaft, weft insertion and weft accumulation of the water jet loom through the digital technology, the automation technology is high, and the information feedback is rich.

The invention provides a data source generating method for passive direction finding location. The method aims at high cost of satellite passive direction finding location, is based on the theory of passive direction finding location, and includes initial setup, earth satellite kinematics environment recursion, observation data generation and other links. The invention has the characteristics of flexible parameter setting, high computing speed, and high accuracy of output observed quantity. Practical engineering problems in the process of on-satellite location algorithm design, namely, difficult calibration and low calibration efficiency, are solved. A large number of reliable data sources can be provided for location algorithm verification. A location result obtained by the method can be used as the basis for checking the accuracy of a direction finding location algorithm.

The invention relates to a wheel set carrying robot. The wheel set carrying robot comprises a rack, a driving system, a power supply, a guiding system, a hydraulic auxiliary system, a control panel and a safety protection system, and further comprises at least one pair of wheel set bearing mechanisms and axle positioning mechanisms. Driving wheels are installed at the four bottom corners of the rack and driven by the driving mechanism. The safety protection system and the control panel are installed at the front end of the rack, the safety protection system is composed of anti-collision stops and a distance sensor, and the control panel comprises a touch display screen, operation buttons and an emergency stop switch. The wheel set bearing mechanisms are arranged on the upper portion of the rack, the axle positioning mechanisms are arranged on the center lines of the paired wheel set bearing mechanisms, and hydraulic cylinders are arranged at the bottoms of the wheel set bearing mechanisms and controlled by the hydraulic auxiliary system. The wheel set carrying robot can run along a specified wheel set overhaul line and carry wheel sets with own functions, the labor cost is greatly reduced, the labor intensity of workers is greatly relieved, and the efficiency of automatic overhaul of wheel sets is improved.

The invention provides a multichannel digital measurement and control system based on I2C and CAN bus (inter-integrated circuit and controller area network bus), comprising master controller unit (1),I2C bus isolating unit (2), I2C bus driving unit (3), I / O (input / output) parallel extension unit (4), I / O isolating unit (5), CAN bus isolating unit (6), CAN bus output protection unit (7) and user interface unit (8). The multichannel digital measurement and control system based on I2C and CAN bus has the advantages that parameter setting is flexible and convenient, quick, stable and seamless switching can be provided, reliability and speediness of the multichannel digital input / output measurement and control system are guaranteed, and the system is adaptive to workplaces with complex electromagnetic environment, long transmission distance and high communication accuracy.

The invention discloses a 2.5 D portrait shallow relief modeling method and system, belonging to the field of portrait shallow relief modeling. The technical problem to be solved is how to construct a2.5 D portrait shallow relief model with adjustable geometric details and clear display, which can save time and labor. The method comprises the following steps: model preprocessing: after presettingthe mapping angle, the original three-dimensional portrait model is transformed into 2.5 D height field model, and the 2.5 D height field model is enhanced in normal detail; height field generation and optimization: the 2.5 D height field model is compressed linearly to generate the initial portrait relief, and the height field details of the initial portrait relief are restored and optimized; height field local editing: the initial portrait shallow relief is scaled regionally and multiscale based on the thickness scaling factor. Its structure includes a model preprocessing module, a height field generation and optimization module, and a height field local editing module. The invention can construct a portrait bas-relief which can adjust and clearly display geometric details.

The invention is suitable for the technical field of SVC device safety detection, and provides a thyristor overvoltage detection circuit used for a TCR type high-voltage SVC device. AC voltage of the two ends of a thyristor is rectified into positive half-wave voltage by a rectification circuit. Positive half-wave generated through rectification is scaled to voltage range of the input end of an isolation amplifier by a high-voltage side differential proportion amplification circuit. Voltage signals detected by a high-voltage side circuit are transmitted to a low-voltage side circuit in an isolation mode by the isolation amplifier. Voltage outputted by the isolation amplifier is amplified and outputted to an overvoltage judgment and comparison circuit by a low-voltage side differential proportion amplification circuit. The detected voltage and an overvoltage threshold value Vref are compared via the judgment and comparison circuit. The thyristor is triggered to be conducted by controlling a thyristor trigger circuit according to the comparison result when the thyristor is overvoltage. The circuit is quite concise, element price is low, and problems that conventional high-voltage thyristor overvoltage detection circuits are high in cost, complicated in circuit and inflexible in overvoltage parameter setting can be solved.

The invention relates to a blower fan filter set and an EFU surface wind speed uniformity automatic testing device and a method, wherein the device comprises: an auxiliary wind system in connection with one side, a large scale static pressure chamber with an opening at the other side a baffle plate arranged on the circumference of the opening of the large scale static pressure chamber, a straight line guide rail mechanism horizontally arranged at the upper side of the opening of the static pressure chamber, a telescopic mechanism vertically arranged on the straight line guide rail mechanism, a wind speed probe arranged at the end of the telescopic rod mechanism, a wind speed instrument in connection with the wind speed probe, and a display controller in electric connection with the straight line guide rail mechanism, the telescopic rod mechanism, and the wind speed instrument. The method comprises: setting the delay time and the measurement time; inputting the dimension parameters related to the tested FFU or EFU; setting and choosing a proper testing point to deploy schemes; positioning the starting point of the measurement probe; waiting until the completion of the automatic testing and checking and exporting the testing result. Compared with the prior art, the device and the method of the invention can be operated conveniently, which increases the testing efficiency and the accuracy significantly.

The invention provides a two-stage isolation type Ethernet dual-redundancy communication system. The two-stage isolation type Ethernet dual-redundancy communication system comprises a main controllerunit, a preceding stage isolation conversion unit, an Ethernet controller unit, a final-stage isolation conversion unit, a data network transmission cable and a user interface unit, all of which are connected successively. The two-stage isolation type Ethernet dual-redundancy communication system comprises two independent Ethernet peripheral circuits which can realize a redundancy switching function; that is to say, when one circuit is in fault or is damaged, the system is automatically switched to the other circuit to guarantee data reliability when the system communicates with an external device. The two-stage isolation type Ethernet dual-redundancy communication system is particularly suitable for the occasions with far communication distances, high communication precision requirementsand strong electromagnetic interference in an on-site work environment, such as a ship integrated power energy management system, a distributed transformer substation, a power electronic conversion device and an industrial on-site monitoring system.

The invention discloses a kinematic model based jamming bomb simulation method. The kinematic model based jamming bomb simulation method comprises the following steps of 1 determining launching direction; 2 determining launching speed; 3 determining a launching track; 4 determining ignition time; 5 rendering a bomb head of a jamming bomb; 6 rendering a trail of an infected bomb; 7 generating animation. According to the kinematic model based jamming bomb simulation method, a three-time Bezier curve is used for simulating continuous motion of the jamming bomb, and the problem that motion trails of a segmented model are not continuous is effectively solved. In the kinematic model based jamming bomb simulation method, a kinetic factor is considered, motion randomness is further increased, the motion speed of the jamming bomb is randomized at certain standard, the launching direction is random, and the problem of single models is effectively solved. The kinematic model based jamming bomb simulation method is high in simulation speed, real in effect and more flexible in parameter setting.

The invention discloses a parametric curve modeling method of a high degree of freedom. The parametric curve modeling method comprises the following steps: 1) establishing a basic model curve, and setting the control parameter of the basic model curve for controlling the shape and the position of the curve; 2) establishing a function curve to control the change rule of the parameter of the basic model curve; 3) intercepting coordinates on a parameter control curve to generate the model curve of different positions; and 4) through a plurality of basic model curves of different positions and different shapes, forming a Nurbs curve. Through the method, when a complex curve is established, required manual design is little, and the generated curve has better controllability, higher deformation degree of freedom, flexibility in parameter setting and control, and high curve continuity and fairness quality.

The invention discloses a non-contact automatic voltage regulation device, which comprises an input interface, a power module unit, a transformer unit, a controller unit and an output interface, wherein the power module unit is sequentially turned on or off according to trigger pulses output by a controller unit; the controller units outputs the trigger pulses used for controlling thyristors in the power module unit, adjusts a compensation gear and a compensation direction of the transformer unit, monitors and obtains an output current value flowing through a transformer secondary part in realtime, combines the obtained input end voltage value with the obtained output end voltage value, realizes overvoltage protection, undervoltage protection and overcurrent protection, and achieves voltage-stabilizing control over the output voltage according to a compensation voltage obtained by the transformer unit; and the output interface is used for providing an output stable AC power supply toa user. By connecting the non-contact automatic voltage regulation device in series in a middle section or a tail end of a feeding line, the line voltage is adjusted in a certain range, so that the output voltage is 220 + / -7 V, meanwhile the line loss of the line can be reduced.

The invention provides a multichannel digital measurement and control system based on an I2C bus. The multichannel digital measurement and control system comprises a master controller unit, an I2C busisolation and conversion unit, an I2C bus driving conversion unit, an I2C bus parallel input / output conversion unit, a multichannel input / output isolation and conversion unit and a user interface unit. The system makes parameter setting flexible and convenient, can perform quick, stable and seamless switching and can also adapt to working occasions of complicated electromagnetic environment, longer transmission distance and high communication accuracy, and the reliability and rapidity of the multichannel digital input / output measurement and control system are ensured.

The invention provides a system and method for monitoring the critical state of a power electronic device in a strong electromagnetic environment. The system comprises a first user interface module, an eight-channel signal acquisition module, a main control module, a storage module, a time stamp module, a temperature and humidity acquisition module, a dual RS-485 isolation module and a second userinterface module. The first user interface module is used to acquire eight analog signals reflecting the critical state of the power electronic device. The main control module comprises a multiplex switch unit and an ARM main control unit. The ARM main control unit communicates with the storage module, the time stamp module and the temperature and humidity acquisition module at the same time. TheARM main control unit acquires a real-time time stamp through the time stamp module, and stores data with the time stamp in the storage module. The temperature and humidity acquisition module monitors the temperature and humidity of the ARM main control unit. External data transmission is carried out through the dual RS-485 isolation module and the second user interface module.

The invention discloses a compact brushless electric power steering system (EPS) controller. The compact brushless EPS controller comprises a base, an upper cover and a PCB, a male buckle is arrangedon the surface of the upper cover, a female buckle is arranged on the surface of the base, and the upper cover and the base are connected in a clamped mode through the male buckle and the female buckle; four screw holes are formed in the surface of the base, four fixing holes are formed in the positions, corresponding to the screw holes, of the surface of the PCB, the PCB is fixedly mounted at thetop of the base through screws, and the surface of the base is fixedly connected with a power MOS tube; and a first connector and a second connector are fixedly connected to the bottom, close to thetwo sides, of the PCB correspondingly, and a motor driving module is further mounted on the upper surface of the PCB. According to the compact brushless EPS controller, the safety performance of the controller in the working process is improved, and the gate drive power MOS tube is further effectively protected. The larger PCB wiring space can be released in design, and the design and manufacturing costs are greatly lowered.

The invention discloses a three-phase load tracking energy-saving control device which is set to be power supply control aiming at different line loads and different load objects and is provided with a main control MCU (Microprogrammed Control Unit) processor for respectively controlling three slave MCU processors, wherein the three slave MCU processors respectively control regulation of voltages of an A phase, a B phase and a C phase. The three-phase load tracking energy-saving control device is additionally provided with an illuminance sensor, a temperature sensor, a voltage sampling circuit, a current sampling circuit and a phase voltage overzero sampling circuit which are connected with the main control MCU processor. The main control MCU processor determines whether a load voltage is regulated according to data of the illuminance sensor and the set time data. The three-phase load tracking energy-saving control device has the advantages that no contacts exist in a main loop, a power supply in a voltage regulating process is not interrupted and three phases can realize independent or synchronous voltage regulation and reactive compensation, and can be applied to multiple kinds of loads in a three-phase load unbalance environment. The three-phase load tracking energy-saving control device is seamlessly connected with a multi-stage monitoring system, and realizes system remote wireless monitoring management.

The invention discloses an electronic oil pressure difference switch, and belongs to the technical field of industrial sensors and refrigeration. The electronic oil pressure difference switch comprises a shell and a mechanical head connected with the shell. Wherein a circuit board is arranged in the shell, the circuit board comprises a Hall sensor, and the Hall sensor is located at the end, closeto the mechanical head, of the circuit board; One end of the mechanical head is a copper head, and a permanent magnet and a spring making contact with the permanent magnet are arranged in an inner cavity of the other end of the mechanical head. The circuit board further comprises a temperature sensor and a micro-control unit. The end face of the copper head is provided with a low-pressure open hole, the outer side face of the copper head is provided with a high-pressure open groove, and two cavities of a tested oil way are connected with the low-pressure open hole and the high-pressure open groove respectively. A separated design structure is adopted, the mechanical head is separated from the shell, installation is convenient, and maintenance is easy; And various parameters can be flexiblyset, so that the device can adapt to various types of oil ways and various pressure ranges.

The invention discloses a lifting equipment system and a control method thereof. The control method adopts a radar distance measuring mode to detect a motion distance of lifting equipment, corrects the motion distance, and controls the motion of the lifting equipment according to the corrected distance and a preset threshold. The lifting equipment system comprises a distance measuring sensor, a controller, an execution mechanism and input mechanism; the distance measuring sensor is used for measuring the motion of the lifting equipment; the controller calculates the motion distance for correction according to measured data, and outputs control signals; the execution mechanism is acted according to the control signals; and the input equipment is used for inputting parameters. The motion distance of the lifting equipment can be precisely measured to prevent mechanical collision, so that the damage of the lifting equipment is reduced.

The invention discloses a laser detector, including the machine body, the laser detection head, the laser controller, the level mobile device, and the fixture part, and the said laser detection head and the laser controller are installed in the machine body, the level mobile device installed between the laser transmitter and the laser receiver on the main supporting board of the machine body, and the fixture part connecting with the level mobile device, which can left and right move with the driven of the level mobile device, and the fixture part has the rotating pair rotors, the groove formed between the rotors is used to place the detected products. The laser diameter detector also includes the control device to control the said laser detection head, the laser controller, the level mobile device, and movement of the fixture part. The invention can detect the diameter and beating value of the shaft units, with high detection speed and accuracy, to solve the difficulty the traditional manual detection, which is slow and low accuracy, and it has the multi-function detection, flexible parameter setting, easy and convenient operation, and this invention can meet the great demand for OA production industry, with the broad market and higher economic benefit.

The invention belongs to the technical field of low-and-intermediate level radioactive waste and relates to a thermal chemical treatment method for low-and-intermediate level radioactive waste for treating low-and-intermediate level radioactive organic combustible waste comprising radioactive substances generated by hospitals, scientific research institutions and nuclear power units, solving the problem of great deposit volume and difficulty of storage of the low-and-intermediate level radioactive waste, and achieving volume reduction and harmless treatment of the low-and-intermediate level radioactive waste. 0.1-1% of the purified radioactive substance smoke sucked by a power device is exhausted from a smoke air outlet, and 99-99.9% of radioactive elements are left in incombustible ash residues to be sealed uniformly and cured with cement, so that the processing course of the low-and-intermediate level radioactive combustible waste is finished. The volume reduction ratio of the low-and-intermediate level radioactive organic combustible waste reaches 97-99%. The method is reliable in principle, high in volume reduction ratio, good in curing effect, low in secondary pollution, friendly in application environment, low in investment and operation costs and energy-saving and environment-friendly, and has a good economical benefit and a wide market prospect.

The invention discloses a full-automatic low-energy-consumption warming system of a greenhouse. The full-automatic low-energy-consumption warming system comprises an electric temperature control circulating water pump, a water conveying pipe, heat radiation sheets and an automatic warming device with a heat preservation function, wherein the automatic warming device is provided with a liquid capacity cavity, a water outlet and a water inlet; the water outlet of the automatic warming device, the electric temperature control circulating water pump, the plurality of heat radiation sheets and the water inlet are connected in sequence by the water conveying pipe to form a heat-transfer cycle loop; heat absorption coatings coat the outer parts of the heat radiation sheets. The starting temperature of repeatedly heating a heat transfer medium is very high through the heat preservation function of the automatic warming device and the heat absorption function of the heat radiation sheets coated with heat absorption materials, so that the energy consumption is extremely saved, the energy efficiency is high and the warming cost is saved. Overall, the full-automatic low-energy-consumption warming system has the advantages of energy conservation, environment friendliness and no pollution, uniformity in warming, low cost and high energy efficiency, full-automatic warming, water conservation, and flexibility and convenience for setting, and can be widely popularized and applied.

The invention relates to a wheel set carrying robot. The wheel set carrying robot comprises a rack, a driving system, a power supply, a guiding system, a hydraulic auxiliary system, a control panel and a safety protection system, and further comprises at least one pair of wheel set bearing mechanisms and axle positioning mechanisms. Driving wheels are installed at the four bottom corners of the rack and driven by the driving mechanism. The safety protection system and the control panel are installed at the front end of the rack, the safety protection system is composed of anti-collision stops and a distance sensor, and the control panel comprises a touch display screen, operation buttons and an emergency stop switch. The wheel set bearing mechanisms are arranged on the upper portion of the rack, the axle positioning mechanisms are arranged on the center lines of the paired wheel set bearing mechanisms, and hydraulic cylinders are arranged at the bottoms of the wheel set bearing mechanisms and controlled by the hydraulic auxiliary system. The wheel set carrying robot can run along a specified wheel set overhaul line and carry wheel sets with own functions, the labor cost is greatly reduced, the labor intensity of workers is greatly relieved, and the efficiency of automatic overhaul of wheel sets is improved.

The invention discloses a laser detector, which includes a machine body, a laser head, a manipulator, a feeding mechanism, a receiving mechanism, a detection fixture, and a laser controller. In terms of mechanism, the laser lifting mechanism is installed on the support plate of the body, the feeding mechanism, the receiving mechanism, and the detection fixture are set on the support plate of the body. The manipulator includes a mechanical finger, a Y-axis support mechanism, and an X-axis support mechanism. On the Y-axis support mechanism that moves along the Y-axis direction, the Y-axis support mechanism is installed on the X-axis support mechanism, and the X-axis support mechanism is installed on the body support plate to support the entire manipulator. The laser detector also includes control of the above-mentioned laser head, laser A controller, a manipulator, a feeding mechanism, a receiving mechanism, and a control device for detecting the motion of the fixture. The invention has high detection precision, fast speed, flexible parameter setting, simple and convenient operation, broad market and high economic benefits.

The invention provides a PWM wave based multi-channel 4-20 mA control command converting system. The system includes a controller unit (1), an electric level converting unit (2), an isolation conversion unit (3), a low-pass filtering unit (4), a 4-20 mA voltage / current converting unit (5), a current signal transmission cable (6) and a load interface unit (7) connected in sequence. The system is applied as a CPU into an ARM in an embedded system widely with high performance and at a low cost, multi-channel PWM wave voltage signals of required (fixed) frequency and adjustable duty ratio are generated from multi-channel PWM waveforms of TIM<X> of the ARM and are converted to multi-channel 4-20 mA current output signals. The anti-interference capability is improved and multi-channel long-distance transmission is realized. Besides, the system is high in control precision, stable in performance and reliable in operation.

The invention relates to the technical field of the sensor control, and specifically discloses an optical fiber dew-point humidity detection device. The detection device comprises a first optical fiber, a humidity sensing layer, a second optical fiber, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a light source, a first optical power meter, and a second optical power meter; the invention further discloses an optical fiber dew-point humidity detection system; the system comprises the above optical fiber dew-point humidity detection device, a computation controller, a data collector, a temperature sensor, a refrigerator and an executor; the invention further discloses a control method of the optical fiber dew-point humidity detection system, the method comprises the following steps: S1, cooling; S2, collecting real-time data; S3, transmitting the collected data to the computation controller; S4, processing to obtain a refractive index-timecurve and a temperature-time curve; S5, judging a temperature value when condensation occurs; and S6, computing relative humidity. The optical fiber dew-point humidity detection device disclosed by the invention has the advantages of being high in testing precision, convenient for operation, stable in operation and high in environment adaptive ability.

The invention discloses a control system for high-speed control light source camera triggering and a control method. The control system comprises a PLC module, a main controller, a light source, a camera, a triggering module and an interface parameter setting module; an output end of the PLC module is connected with a first input end of the main controller; a first output end of the main controller is connected with an input end of the light source; a second output end of the main controller is connected with an input end of the camera; a second input end of the main controller is connected with an output end of the triggering module; and an output end of the interface parameter setting module is connected with a third input end of the main controller. According to the invention, the number of priority groups can be improved, and light source interference of an image is eliminated.

The invention discloses a testing device of comprehensive performance of an automotive clutch booster. The testing device of the comprehensive performance of the automotive clutch booster comprises a liquid crystal display, a clamping mechanism, a load mechanism, a keyboard area, a computer, a control box and a power device, wherein the automotive clutch booster is arranged on the clamping mechanism; a push rod of the automotive clutch booster is pushed firmly by the load mechanism; testing parameters are input to the computer by a user through a keyboard; a starting button on the control box is pressed down; the computer can send out a signal to control the power device to work; signals read by an air pressure sensor and a hydraulic sensor on the power device as well as a power sensor and a displacement sensor on the load device are input to the computer; and the signals are processed and analyzed by the computer to obtain a result which is displayed by the liquid crystal display. With the adoption of the testing device of the comprehensive performance of the automotive clutch booster, the comprehensive performance of the automotive clutch booster can be completely tested, and operating characteristics and a curve of the automotive clutch booster are displayed.

The invention discloses a motion distance testing and limiting device for lifting equipment. The testing device comprises an input gear, a rotary shaft, a shaft coupler and a rotary coder, wherein theinput gear is fixedly arranged on the rotary shaft; one end of the shaft coupler is connected with the rotary shaft, and the other end of the shaft coupler is connected with the rotary coder; the rotary coder records rotation of the input gear, and calculates the motion distance of the lifting equipment; the limiting device comprises a reverser, a shifting device and a limiting sensor, wherein the reverser is used for converting the rotation direction of the shaft coupler; the shifting device is used for recording relative movement of the lifting equipment; and the limiting sensor outputs a corresponding control signal while reaching a limiting position so as to control the lifting equipment to work. The rotary coder is adopted to realize testing and limiting the motion distance of the lifting equipment; and a mechanical limiting device is further arranged to realize dual limiting control on the lifting equipment, so that limiting can be guaranteed to realize, and collision of the lifting equipment is reduced.