56results about How to "Eliminate measurement errors" patented technology

The invention belongs to the technical field of magnetic variable measurement, and particularly relates to a nuclear magnetic resonance magnetic variable measurement debugging device which comprises a mounting part, an inner supporting mechanism, a supporting mechanism, a control mechanism, a flow guide mechanism and an air inducing mechanism. The mounting part comprises a bearing bracket and a mounting box fixedly mounted on the side wall of the bearing bracket; the inner supporting mechanism comprises a bearing disc and a clamping jaw, the bearing disc is rotationally arranged on the inner wall of the bearing support, and the clamping jaw is slidably mounted on the outer wall of the bearing disc; the supporting mechanism comprises an arc-shaped frame and supporting rollers rotationally installed at the two ends of the arc-shaped frame. The arc-shaped frame is fixedly installed on the upper end face of the installation box. The control mechanism is used for controlling the clamping jaw to move; the air inducing mechanism comprises a control cylinder, an exhaust hood and an air inlet hood, the control cylinder is fixedly installed on the inner wall of the bearing support, and inner cavities of the exhaust hood and the air inlet hood are connected through the control cylinder; through cooperation of the structure, detection signal distortion is prevented, the magnetic variable measurement precision is greatly improved, and the full-detection requirement of batch production is met.

The utility model discloses an automatic water inlet and outlet device of circulating water aquaculture system relates to aquaculture technical field, including siphon drain pipe, with curved pipe section, the inlet end of siphon drain pipe is connected to the aquaculture pond, and the export end extends to the sewage bin, water level indicating pipe has the vertical pipe section with the intercommunication of aquaculture pond, and the top of vertical pipe section is communicated with atmosphere, makes its inside water level and aquaculture pond real -time synchronization, air pipe, one end intercommunication curved pipe section's top, the other end inserts the top of vertical pipe section, is used for controlling the start -stop of siphon drainage, wherein, the depth of air pipe insertion vertical pipe section is adjustable, is used for controlling the flow of siphon drainage. The utility model discloses a siphon drain pipe with curved pipe section is set up, utilizes siphon physical effect to realize zero -energy -consumption's drainage start and maintain, through setting up the air pipe of intercommunication curved pipe section top and inserting vertical pipe section, completes pure physical formula drainage start -stop control, and the need of artificial intervention is eliminated.

The invention relates to the technical field of control, in particular to a motor controller control method, device and equipment and a motor controller, and the method is applied to the motor controller of which each phase comprises at least two power switch devices connected in parallel. Acquiring the real-time temperature of the shell of each power switch device corresponding to the phase; compensating the real-time temperature based on a pre-calibrated initial offset value to obtain a temperature compensation value of the power switch device on the phase; determining a highest temperature compensation value and a lowest temperature compensation value corresponding to the phase, and calculating a temperature difference absolute value between the highest temperature compensation value and the lowest temperature compensation value; and controlling the working mode of the motor controller based on the temperature difference absolute value and the highest temperature compensation value of all phases in the motor controller. Whether each power switch device is in the non-current-sharing state or not is judged through the real-time shell temperature, hardware cost does not need to be newly increased, and the internal structure of the motor controller is simplified.

This application discloses a precision capacitance sensing system, comprising a modulation signal source, a sensitive probe, a differential transformer bridge, a signal amplification link, an analog multiplier, and a low-pass filter circuit, all connected in sequence. It also includes a demodulation reference signal source, the output of which is connected to the second input of the analog multiplier. The demodulation reference signal source is used to generate a multi-frequency combination demodulation reference signal, which is composed of a fundamental frequency component and at least two harmonic components superimposed. This invention also discloses a precision capacitance sensing method. By employing a specially designed demodulation reference signal, this application ensures that the system output remains constant within a continuously varying range of the demodulation phase difference, thereby achieving complete insensitivity to phase difference fluctuations and effectively overcoming the performance bottleneck that has long constrained high-precision capacitance sensing.

The invention relates to the technical field of soil testing, and discloses a lateral pressure adjustable expansive soil expansion rate measuring device, which comprises an experiment box, a sample cylinder and a measuring module, symmetrical through holes are formed in the side wall of the sample cylinder, a lateral pressure loading system is correspondingly arranged on the outer side of each through hole, and each lateral pressure loading system comprises a rigid piston head capable of extending into the cylinder, a piston rod, a closed medium pressure cavity and a miniature constant pressure pump; the pump is connected with the pressure cavity through a pipeline, and the piston head is driven to apply adjustable lateral pressure to the sample by accurately feeding and discharging a medium; the measurement module comprises a vertical deformation and lateral pressure measurement system and integrates free expansion and lateral confinement expansion measurement functions; the rigid piston and the water medium are adopted for constant-pressure loading, the structure is simplified, operation is convenient and fast, rapid response and high-stability control over lateral pressure are achieved, the membrane embedding effect is thoroughly eliminated, a multi-stage constraint continuous test can be completed through one-time sample loading, and the test efficiency and data consistency are remarkably improved.

This utility model discloses a rapid testing device for rock deformation parameters, comprising a protective shell, one end of which is connected to the drill pipe and the other end to the drill bit. A power supply module, a resistance strain gauge group, a deformation parameter testing module, and a wireless transmission module are installed inside the protective shell. The power supply module provides power to the resistance strain gauge group, the deformation parameter testing module, and the wireless transmission module. The internal power supply line connecting the power supply module and the resistance strain gauge group is connected to the deformation parameter testing module via a signal transmission line. The deformation parameter testing module is electrically connected to the wireless transmission module. This utility model, by deploying resistance strain gauges, the deformation parameter testing module, and the wireless transmission module, monitors the strain signal generated by the interaction between the drilling equipment and the rock in real time, achieving rapid, accurate, and real-time testing of the Poisson's ratio of the rock mass during drilling, thereby guiding the evaluation of surrounding rock stability and the optimization design of support schemes in underground engineering.

The utility model discloses a dial indicator fixing clamp for motor detection, which comprises a flange plate, a motor shaft movably connected to the center of the flange plate, a circular screw fixedly connected to the upper end of the motor shaft, a first connecting rod fixedly connected to the upper end of the circular screw, and a rotating arm group movably connected to one end of the first connecting rod. The rotating arm group comprises two rotating arms, and the rotating ends of the two rotating arms are connected with each other; through the connection between the circular screw rod and the motor shaft, the cooperative use of the clamping ball and the universal groove, and the connection between the positioning clamping groove and the positioning clamping block, the overall connection has stronger stability and reliability, and is not influenced by factors such as vibration, temperature and an external magnetic field; it is ensured that the dial indicator is always firmly fixed to a designated position in the detection process, the risk of falling possibly occurring in a traditional magnetic attraction mode is effectively avoided, measurement errors caused by displacement of the dial indicator are eliminated, and the reliability of planeness data of the flange face is ensured.

The utility model discloses a plastic pipe external diameter laser measuring device, which comprises a spacing-adjustable supporting wheel, a rotation driving mechanism and a double-laser measuring head assembly, the supporting wheel adopts a V-shaped rubber rim structure to prevent axial displacement and surface scratch of a pipe, a rotation disc triggers a laser head through a magnetic encoder to acquire data at an equal angle interval of 0.1 degree, and the rotation driving mechanism is connected with the double-laser measuring head assembly. High-density uniform sampling is realized by combining closed-loop control of a servo motor; the three-axis measuring platform is provided with an electric adjusting mechanism, the laser head is automatically adjusted to the optimal focusing distance according to the initial measuring value, and the data processor dynamically optimizes the sampling frequency and calculates the ellipticity deviation. The device has the advantages that the influence of rotating speed fluctuation is eliminated through an angle triggering mode, the V-shaped supporting structure is matched with a DN 20-300 mm pipe, high-precision nondestructive measurement is guaranteed through a rubber protection layer and an automatic focusing mechanism, and the device is suitable for rapid detection of a continuous production line.

The application discloses a kind of line spectrum confocal sensor detection method, system and medium, the detection method, comprising: based on the height data at each position in scanning line direction, the inclination angle of current scanning line and the corresponding scanning line of standard installation in horizontal plane is analyzed;The relative movement of scanning line is controlled, and the deflection angle of the relative movement direction of sensor is analyzed according to the height information of the calibration object detected by scanning line at any two time;Based on the deflection angle and the inclination angle, the real position coordinates corresponding to the height of the surface of the measured object detected in scanning line direction are corrected to obtain the real surface topography of the measured object.The application corrects position to obtain the real position coordinates corresponding to the height data detected, adjusts the point cloud data of the reconstructed surface topography of the measured object, and improves the accuracy of the surface topography detection of the measured object.

The invention relates to the technical field of coal mine underground dust prevention and control, and discloses a working face negative pressure ventilation dust falling method, system and device. The method comprises the following steps that an intelligent control center obtains the real-time traction speed and the real-time coordinate position of a coal mining machine through a dust source tracking and positioning sensing unit; establishing coordinate mapping logic according to the real-time coordinate position so as to calculate the number of the hydraulic support currently corresponding to the coal mining machine; judging the running direction of the coal mining machine according to the sign sign of the real-time traction speed, and generating a support number set in an activated state at the current moment by combining a preset advanced dust pre-suction support number and a preset lagging purification support number; and sending an instruction to the distributed negative pressure dust collection device array according to the support number set in the activated state, and controlling the gas circuit control units in the support number set in the activated state to be started, so that a negative pressure suction and capture area is formed around the roller of the coal mining machine. According to the invention, accurate capture of the mobile dust production source and on-demand adjustment of the air volume are realized.

This invention relates to the field of transducer technology, specifically to an integrated coupled piezoelectric ultrasonic transducer, comprising an aluminum alloy cylindrical shell; silver-impregnated electrodes on both the upper and lower surfaces of the sensing unit, which simultaneously excite longitudinal and transverse waves under high-voltage pulse excitation; a backing damping block for absorbing reverse sound waves and improving signal clarity; a stainless steel bottom cover fixed to the open end of the shell and tightly coupled to a piezoelectric ceramic sheet, serving as protection and sound wave transition; an integrated coupling layer consisting of a flexible solid coupling sheet pre-attached to the outside of the stainless steel bottom cover; and a magnetic fixing ring, a ring-shaped neodymium iron boron permanent magnet embedded in the shell, for providing attraction force to the ferromagnetic bolts to stabilize the coupling pressure. Its advantages include: extremely simplified structure, compact size and light weight, low cost, elimination of measurement errors, improved measurement repeatability, and greatly simplified on-site operation procedures.

The invention discloses a displacement sensor based on electromagnetic induction and a displacement measuring method, the sensor comprises a sensing and signal generating unit, a signal conditioning and converting unit and a digital processing and resolving unit, the sensing and signal generating unit comprises a multi-path analog switch and an LC oscillating circuit, inductance elements in the LC oscillating circuits are composed of displacement sensitive elements, and the multi-channel analog switch is used for selectively connecting the displacement sensitive elements to the corresponding LC oscillating circuits. The signal conditioning and converting unit is used for shaping the oscillation signal into a digital pulse signal; and the digital processing and resolving unit can measure the frequency of the digital pulse signal by adopting an equal-precision frequency measurement method and resolve the displacement according to the change of a frequency value. According to the invention, stable output amplitude and high frequency stability are maintained in a wide frequency range, and the stability of signals is ensured; in addition, measurement errors of a traditional frequency measurement method at low frequency are eliminated, and high-precision measurement in a full-scale range is guaranteed.

The application discloses a real-time measuring device for soil plug height in pipe pile sinking test, which comprises a pile end connecting piece, a controllable sliding rail, a tension wire displacement meter, a pulley assembly, a steel strand and a counterweight block. The pile end connecting piece comprises a pile connecting disc with a through hole in the center, and uniformly distributed screw holes in the circumference are used for fixed connection with the pipe pile end. The controllable sliding rail is vertically arranged on the outer periphery of the pile end connecting piece. The tension wire displacement meter is fixed on the controllable sliding rail and is height-adjustable. The pulley assembly comprises a first pulley and a second pulley. The first pulley is arranged at the bottom of the controllable sliding rail, and the second pulley is installed in the through hole of the pile connecting disc. One end of the steel strand is connected with the tension wire displacement meter, and the steel strand is sequentially wound around the first pulley and the second pulley and then vertically extended downward. The counterweight block is connected with the free end of the steel strand, and a threaded spike is fixed at the bottom center of the counterweight block. The application breaks through the limitation of traditional manual measurement and realizes continuous, automatic and high-precision monitoring of the soil plug height in the pipe pile sinking process.

The utility model relates to the technical field of lens production, in particular to a light transmittance detection device for optical lens production, which comprises a processing table, a turntable is mounted at the top of the processing table through a cam divider, and a processing mechanism is arranged on the processing table and used for processing a lens. Comprising a plurality of positioning seats circumferentially distributed on the outer edge of the top of a rotary disc, four sliding seats circumferentially distributed are fixed to the upper ends in the positioning seats, double-end racks are slidably mounted in the sliding seats, positioning heads are mounted at the tops of the double-end racks, and guide gears are arranged on the two sides of the sliding seats and are in meshing transmission with the double-end racks; automatic positioning of the lens is realized, uniform distribution of clamping force is ensured, and offset deformation is avoided; an optical detection system is constructed through a laser light source and a photoelectric sensor and is matched with a collimating lens to form a standard light path, the transmission light intensity ratio is accurately measured, the light transmittance is calculated, and efficient and accurate automatic detection is achieved.

The present application relates to the technical field of image recognition, in particular to a meteorological observation station clearance environment automatic evaluation method based on deep learning, comprising the following steps: collecting panoramic image to calculate distortion parameters, establishing pre-processing feature set, using coding-decoding network to fuse attention mechanism to extract features and adjust sampling interval to generate semantic feature matrix, screening pixel category to extract boundary coordinates to construct skyline sequence, calculating coordinate offset and field of view angle mapping to obtain shielding elevation angle to generate final environment evaluation data. In the present application, the edge distortion is overcome by jointly correcting the field of view deformation of multiple source data, the global correlation is captured relying on the network attention mechanism to avoid the loss of position features, the sampling rate is dynamically scaled based on the feature distribution to retain high-frequency details and accurately locate the skyline boundary, the real skyline sequence is extracted combined with the effective field of view parameter to map and convert the real elevation angle, and the large calculation deviation caused by complex terrain is effectively eliminated to greatly improve the clearance judgment precision.

The application specifically relates to the technical field of household appliances, and particularly relates to a sweeper, which comprises a base provided with a rolling brush cavity and a battery cavity on a side close to the ground, the rolling brush cavity and the battery cavity are adjacently arranged along a first direction; a rolling brush mechanism is movably installed in the rolling brush cavity; an installation cavity is arranged on a side of the base far from the ground and between the rolling brush cavity and the battery cavity; the installation cavity is in communication with the rolling brush cavity; a driving mechanism is arranged in the installation cavity; a driving end of the driving mechanism extends into the rolling brush cavity and is connected with the rolling brush mechanism; under the driving effect of the driving mechanism, the rolling brush mechanism moves along a third direction. The driving mechanism is directly arranged in the installation cavity, the space of the base is fully utilized, the space utilization rate is improved, and the overall volume of the transmission mechanism can be reduced. The volume of the driving motor and the transmission mechanism is large, the compact layout of the sweeper in the longitudinal height can be reduced, and the thickness of the sweeper can be controlled within a certain range.

The invention discloses a current sensor for a train traction system and a signal processing circuit of the current sensor, and belongs to the field of current measurement, the current sensor comprises an outer shell and a cover plate, a through hole is reserved in the center of the outer shell, a rectangular-ambulatory-plane containing space is formed around the periphery of the through hole, and the cover plate is assembled on the containing space; a magnetic conduction unit and a circuit board are sequentially assembled in the containing space from top to bottom in the vertical direction, and two Hall elements are assembled on the circuit board. The two Hall elements are symmetrically arranged with the center of the through hole as the axis and are connected in parallel. According to the current sensor for the train traction system and the signal processing circuit of the current sensor provided by the invention, the measurement error caused by threading position deviation is effectively eliminated through the symmetrical parallel design of the double Hall elements and the bonding fixation and secondary mechanical fixing structure of the magnetic conduction unit and the circuit board; the stability of magnetic field induction and the signal acquisition precision are improved.

The invention provides a high-precision standard plate thickness fixed-point measurement and compensation system and method. The system comprises a base; the two-dimensional object carrying movement module is mounted on the base; the concentric-square-shaped support is fixed to the base and spans the two-dimensional object carrying movement module; the net-shaped precise object carrying platform is arranged on the two-dimensional object carrying motion module and is used for carrying a to-be-measured workpiece and accurately positioning the position of a measuring point; the first laser sensor and the second laser sensor are arranged on the upper side and the lower side of the concentric-square-shaped support; and the control system is in communication connection with the two-dimensional loading motion module, the first laser sensor and the second laser sensor, and is used for controlling the two-dimensional loading motion module to move, accurately positioning the position of the measuring point and calculating the thickness of the workpiece to be measured. A high-precision standard plate thickness fixed-point measurement and compensation system is formed through the high-precision laser sensor, the net-shaped precise object carrying platform and the control system, and the contour of a workpiece to be measured can be described.

This invention relates to an automatic vehicle weighing system based on a dynamic transportation process, belonging to the field of vehicle load detection technology. The system includes: a data acquisition unit for real-time acquisition of deformation angle data from measuring points on the vehicle's suspension system and generation of timestamps and vehicle identifiers; a data processing and communication unit for data preprocessing, local caching, obtaining vehicle location and operating conditions, and enabling local storage to resume transmission when communication is interrupted; a background service and calculation unit, where a dynamic benchmark management module automatically identifies periods of no-load, stationary, and horizontal state, stores the acquired deformation angle data as dynamic no-load benchmark values, and automatically triggers benchmark updates when the deviation between the new benchmark value and the initial benchmark value exceeds a threshold; and a load calculation module calculates the vehicle's load weight based on real-time deformation angle data and dynamic no-load benchmark values, combined with a load calculation model. This system achieves high-precision, maintenance-free dynamic measurement of the vehicle-mounted weighing system and improves its adaptive correction capability against zero-point drift.

The invention relates to the technical field of precision displacement measurement, and discloses a novel grating reading head and a detection method.The novel grating reading head comprises a novel grating reading head body and a data output interface, and a grating reading head measuring assembly is arranged on the front face of the novel grating reading head body; the grating reading head measuring assembly comprises a high-power LED photoelectric sensor and a signal processing circuit and is used for measuring infinitesimal displacement and processing signals, and a sensor assembly is arranged on the back face of the novel grating reading head. Integration of miniaturization and multi-dimensional perception of the grating reading head is realized through front and back circuit layout, the photoelectric measurement assembly is arranged on the front of the PCB, the 9DOF, the temperature sensor and the vibration sensor are integrated on the back of the PCB, a traditional huge mechanical adjustment structure and an external sensor scheme are replaced, hardware cost and size are reduced, and meanwhile, the measurement precision is improved. In-situ detection of the state of the reading head body is realized.

The application discloses a roll changing pile falling detection system and method and a roll changing trolley, and relates to the technical field of roll changing. The roll changing pile falling detection system comprises a measuring device and a detection terminal. The measuring device is used for outputting the pitch angle of the roll changing trolley and the first measuring distance between the roll changing trolley and the roll to be changed when the roll changing trolley performs the pile falling detection task of the roll to be changed. The detection terminal is used for outputting the pile falling detection result of the roll to be changed according to the pitch angle and the first measuring distance. Since the pitch angle of the roll changing trolley affects the distance measuring accuracy, the detection system corrects the first measuring distance according to the pitch angle, so that the interval distance between the roll changing trolley and the roll to be changed is determined more accurately, the measurement error caused by the wheel wear or horizontal position deviation of the roll changing trolley is eliminated, the pile falling state of the upper roll during the roll changing of the rolling mill can be detected with high accuracy, and the accuracy of the pile falling detection during the roll changing of the rolling mill is improved.

The application discloses a quantitative acid adding control system for an AGM battery of an automobile, and comprises a data acquisition module for acquiring electrolyte data in an adding process in real time; the electrolyte data comprises an original flow value and an electrolyte temperature. The original flow value and the electrolyte temperature of the electrolyte are acquired, the original flow value is converted into an actual flow value at a standard temperature in real time, and the measurement error caused by temperature change is eliminated; on the other hand, the adsorption amount of a diaphragm is accurately calculated and is brought into deviation calculation, so that the adding deviation caused by the difference in the adsorption characteristics of the diaphragm is compensated; the deviation amount is corrected in real time by the cooperative compensation module, the core deviation problem in the acid adding process of the AGM battery is solved from the root, and the accurate control of quantitative acid adding is realized.

This invention relates to the technical field of crane control, and in particular to an AI-based control system for the stable operation of a gantry crane to prevent swaying of heavy loads. The AI-based control system for the stable operation of a gantry crane to prevent swaying of heavy loads provided by this invention includes a gantry crane, a hoisting mechanism mounted on the gantry crane, and a lifting device mounted on the lifting end of the hoisting mechanism. It also includes: a sway detection device, comprising multiple sway sensors mounted on the lifting device and a load sensor mounted on the hoisting mechanism; a data processing device connected to the sway detection device; an AI control device connected to the data processing device; and an execution device connected to the AI ​​control device and the gantry crane. The execution device adjusts the motion state of the gantry crane according to the crane control commands to achieve sway suppression. This invention effectively solves the problem of lag in traditional sway control response and significantly improves the accuracy and reliability of sway control.

The application relates to the technical field of shipping safety monitoring, and discloses a bridge clearance height dynamic measurement system for a ship, which comprises an image acquisition unit, a laser ranging unit, a posture sensing unit and a data processing unit. The image acquisition unit is used for acquiring original images containing the bottom of a bridge in real time. The laser ranging unit is used for measuring the slant distance from the laser ranging unit to the bottom of the bridge. The posture sensing unit is used for measuring the roll angle and the pitch angle of the ship in real time. The data processing unit is used for performing spatial coordinate rotation transformation on a laser beam installation vector according to the roll angle and the pitch angle, so that an actual emission elevation angle is obtained. According to the data of the image acquisition unit, the position of a reference line corresponding to an actual water surface in an image is determined through a geometric model. The number of vertical pixels between the reference line and the lower edge of the bridge is counted, and the clearance height of the bridge is calculated in combination with pixel equivalent, so that the bridge clearance height under the dynamic posture of the ship is measured with high precision.

This disclosure provides a network latency measurement method applied to a message processing device, comprising: receiving a first measurement message sent by a message generation device; obtaining timestamp parameters from the extended header of the first measurement message; generating timestamp information based on the timestamp parameters; and generating a second measurement message based on the timestamp parameters and the timestamp information; sending the second measurement message to a target device, the second measurement message being used to instruct the target device to forward the message, thereby measuring the network latency between the network latency measurement system to which the message processing device and the message generation device belong and the target device; and eliminating measurement errors caused by the measurement device itself processing the measurement message, thereby improving the accuracy of network latency measurement. This disclosure also provides an electronic device and a computer program product.

This application provides a circuit and system for voltage information diagnosis and self-calibration. By adding resistors R1 and R2 in series, the total cell voltage is divided, reducing the sampling point voltage Vsample to the measurement range of the analog-to-digital converter (ADC) of the microcontroller (MCU). The MCU accumulates and calculates the total voltage Vafe by sampling the voltages of each cell from the analog front-end (AFE). Based on the Vafe data from the AFE, the total cell voltage Vmcu is automatically calibrated to obtain the calibrated total cell voltage Vcalib. Simultaneously, the MCU compares the calibrated total cell voltage Vcalib with the Vafe voltage in real time to obtain the deviation value Vdiag. When the deviation value Vdiag exceeds a set threshold, fault diagnosis is triggered, indicating an abnormality in the cell voltage sampling function, and a safety protection mechanism is activated to meet functional safety requirements. This circuit, through reasonable hardware design, voltage protection, cell total voltage calibration, and fault diagnosis mechanism, not only improves the accuracy of system measurements but also achieves self-calibration and fault diagnosis, making it suitable for applications with high stability requirements.

The application discloses a kind of estimating method and system of vehicle welding deformation quantity, comprising: using modeling unit to obtain the welding point information of welding piece, the welding point information includes welding point name, welding point coordinate, welding point corresponding plate number;Using coupling unit to format conversion is carried out to the welding point information obtained;Using simulation unit receives the welding point information after format conversion, and determines welding deformation simulation data in combination with the material information, fixture information and welding information of the welding piece;According to welding deformation simulation data, the model of the welding piece is made, and the actual deformation data in the model welding process is measured;Using computing unit, the welding deformation curve of the model is fitted according to the actual deformation data of the model;According to the welding deformation curve of the model, the welding deformation quantity of the welding piece is determined.

The application discloses a radar checking device and method based on a double leveling mechanism, and the radar checking device comprises a water tank, a placing plate, a first electric telescopic rod, a distance measuring mechanism and a first leveling mechanism. The placing plate is used for placing a radar body; the first electric telescopic rod is used for driving the placing plate to move along the height direction of the water tank; the distance measuring mechanism is used for measuring the distance between the emitting surface of the radar body and the bottom of the water tank; and the first leveling mechanism is used for leveling the water tank to keep the water surface in the water tank horizontal relative to the bottom surface of the water tank. The first leveling mechanism is used for leveling the water tank; the water surface in the water tank is kept horizontal relative to the bottom surface of the water tank, so that the measurement error caused by the non-horizontal state of the water surface of the water tank relative to the bottom surface of the water tank is eliminated, and the accuracy of the radar checking is improved.