A device and method for calibrating the spatial plane coordinate position accuracy of a light curtain target

Abstract

The present invention discloses a device and method for calibrating the spatial plane coordinate position accuracy of a light curtain target, which can be used to calibrate the spatial plane coordinate position accuracy of a light curtain target in a precision testing system. The device comprises a two-dimensional displacement motion mechanism, an electric push rod mechanism, and a motion control system for the two-dimensional displacement motion mechanism and the electric push rod mechanism. The electric push rod mechanism is mounted on the two-dimensional displacement motion mechanism, and the push rod end of the electric push rod mechanism is mounted with a simulated projectile for entering and exiting the light curtain. The two-dimensional displacement motion mechanism includes an X-axis motion mechanism for controlling the horizontal movement of the electric push rod mechanism, and a Y-axis motion mechanism for controlling the vertical movement of the electric push rod mechanism. The electric push rod mechanism is perpendicular to the X-axis motion mechanism and the Y-axis motion mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of light curtain targets, and in particular to a device and method for calibrating the spatial plane coordinate position accuracy of a light curtain target. Background Art

[0002] There are several methods for measuring bullet velocity. The most widely used method is the non-contact dual-light-curtain CCD test method, typified by the light-curtain target precision test system. This system, based on photoelectric conversion, dual-CCD imaging, and coordinate measurement and conversion principles, is resistant to external interference and offers high reliability, sensitivity, and accuracy.

[0003] However, in order to ensure the measurement accuracy of the light curtain target precision test system, its coordinate position accuracy needs to be calibrated to determine whether the accuracy of the test system meets the requirements. Currently, there is no device or method for calibrating the spatial plane coordinate position accuracy of the light curtain target precision test system. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a device and method for calibrating the spatial plane coordinate position accuracy of a light curtain target, so as to calibrate the spatial plane coordinate position accuracy of a light curtain target of an accuracy test system.

[0005] The object of the present invention is achieved like this:

[0006] A device for calibrating the spatial plane coordinate position accuracy of a light curtain target comprises: a two-dimensional displacement motion mechanism, an electric push rod mechanism, and a motion control system for the two-dimensional displacement motion mechanism and the electric push rod mechanism.

[0007] The electric push rod mechanism is installed on the two-dimensional displacement motion mechanism, and the push rod end of the electric push rod mechanism is installed with a simulated bullet for entering and exiting the light curtain;

[0008] The two-dimensional displacement motion mechanism includes an X-axis motion mechanism for controlling the electric push rod mechanism to move in the horizontal direction, and a Y-axis motion mechanism for controlling the electric push rod mechanism to move in the vertical direction. The electric push rod mechanism is perpendicular to the X-axis motion mechanism and the Y-axis motion mechanism.

[0009] Preferably, the X-axis motion mechanism includes a horizontal workbench, the Y-axis motion mechanism includes a column support, the X-axis motion mechanism and the Y-axis motion mechanism respectively include a screw-nut mechanism and an AC servo motor, the column support is installed on the horizontal workbench, the X-axis motion mechanism drives the column support to move in the horizontal direction through the screw-nut mechanism and the AC servo motor, and the column support drives the electric push rod mechanism to move in the vertical direction through the screw-nut mechanism and the AC servo motor.

[0010] Preferably, rollers and adjustable support structures are respectively provided at both ends below the horizontal workbench. The adjustable support structure is used to adjust to above and below the rollers to form a walking state and a supporting state. An electrical cabinet is provided in the middle below the horizontal workbench for installing various electrical components.

[0011] Preferably, the X-axis motion mechanism and the Y-axis motion mechanism are respectively provided with grating sensors for measuring the displacement of the electric push rod mechanism in the X-axis and Y-axis directions. The grating sensor signals are electrically connected to the motion control system to form a closed-loop control.

[0012] Preferably, the X-axis motion mechanism, the Y-axis motion mechanism, and the electric push rod mechanism are respectively provided with limit sensors for defining the motion stroke limit.

[0013] Preferably, a threaded mounting hole is provided at the end of the push rod of the electric push rod mechanism along the axial direction, and a screw is provided at the simulated bullet along the axial direction and is threadedly connected to the threaded mounting hole.

[0014] Preferably, the push rod of the electric push rod mechanism is a hollow rod, the inner hole of the push rod is connected to the threaded mounting hole, and a laser collimation sight is installed in the inner hole of the push rod.

[0015] A method for calibrating the spatial plane coordinate position accuracy of a light curtain target includes a calibration device and a light curtain target, wherein the light curtain target is parallel to the X-axis motion mechanism and the Y-axis motion mechanism, and the simulated warhead faces the light curtain target. The accuracy calibration method includes:

[0016] Inputting calibration coordinate points into the motion control system, or randomly generating calibration coordinate points by the motion control system, wherein the calibration coordinate points are plane coordinate points of the plane where the X-axis motion mechanism and the Y-axis motion mechanism are located;

[0017] The motion control system controls the two-dimensional displacement motion mechanism to operate, so that the electric push rod mechanism moves to the calibration coordinate point;

[0018] The motion control system controls the electric push rod mechanism to operate, so that the simulated bullet is shot into and out of the light screen target to be tested, thereby obtaining the calibrated coordinate points of the light screen target to be tested;

[0019] Analyze and compare the calibration coordinate points and the calibrated coordinate points to obtain the error of the light curtain target being tested;

[0020] Using the calibration coordinate points as the standard, calibrate the error of the light curtain target being tested.

[0021] Preferably, the motion control system includes a computer and a three-axis motion controller. The computer and the three-axis motion controller are connected by a network cable for data communication, and the computer controls the three-axis motion controller through the network port. When the simulated warhead enters the light curtain target to be tested, the calibrated coordinate point data is uploaded to the computer through the data acquisition and transmission circuit. The computer calculates, analyzes and compares the calibration coordinate points and the calibrated coordinate points to obtain the error of the light curtain target to be tested.

[0022] Preferably, the computer has built-in calibration software for calculating, analyzing and comparing the calibration coordinate points and the calibrated coordinate points of the light curtain target.

[0023] By adopting the above technical solution, the present invention can realize the calibration of the spatial plane coordinate position accuracy of the light curtain target of the precision test system. The support stability and rigidity are good, and the device has the function of counterweight and electrical protection, which is conducive to the stability of working movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1a It is a schematic structural diagram of the present invention (expanded);

[0025] Figure 1b for Figure 1a A side view schematic diagram of

[0026] Figure 2 It is a schematic structural diagram of the present invention (folded);

[0027] Figure 3 It is a structural diagram of the electric push rod mechanism;

[0028] Figure 4a This is the circuit diagram of the AC servo motor driver;

[0029] Figure 4b Block diagram of the measurement control and data acquisition system for the calibration device;

[0030] Figure 5 This is the overall architecture module diagram of the calibration software;

[0031] Figure 6 This is the motion control software block diagram;

[0032] Figure 7 This is the block diagram of the calibration measurement software;

[0033] Figure 8 This is the block diagram of the repeatability measurement software module;

[0034] Figure 9 Design a block diagram for the overall architecture of the impact point measurement and analysis software.

[0035] Reference numerals

[0036] In the accompanying drawings, 1 is a simulated warhead, 2 is a horizontal workbench, 3 is a column support, 4 is a laser collimator, 5 is an AC servo motor, 6 is a roller, 7 is an adjustable support structure, 8 is an electrical cabinet, 9 is a screw, 10 is an electric push rod mechanism, 11 is a push rod, 12 is a push rod slider, 13 is a push rod slide rail, 14 is a vertical part, 15 is a mounting part, 16 is a card slot, and 17 is a card table. DETAILED DESCRIPTION

[0037] A device for calibrating the spatial plane coordinate position accuracy of a light curtain target comprises: a two-dimensional displacement motion mechanism, an electric push rod mechanism, and a motion control system for the two-dimensional displacement motion mechanism and the electric push rod mechanism.

[0038] The electric push rod mechanism is installed on the two-dimensional displacement motion mechanism, and the push rod end of the electric push rod mechanism is installed with a simulated bullet for entering and exiting the light curtain;

[0039] The two-dimensional displacement motion mechanism includes an X-axis motion mechanism for controlling the electric push rod mechanism to move in the horizontal direction, and a Y-axis motion mechanism for controlling the electric push rod mechanism to move in the vertical direction. The electric push rod mechanism is perpendicular to the X-axis motion mechanism and the Y-axis motion mechanism.

[0040] The X-axis motion mechanism includes a horizontal workbench, the Y-axis motion mechanism includes a column support, the X-axis motion mechanism and the Y-axis motion mechanism respectively include a screw-nut mechanism and an AC servo motor, the column support is installed on the horizontal workbench, the X-axis motion mechanism drives the column support to move in the horizontal direction through the screw-nut mechanism and the AC servo motor, and the column support drives the electric push rod mechanism to move in the vertical direction through the screw-nut mechanism and the AC servo motor.

[0041] Rollers and adjustable support structures are respectively provided at both ends below the horizontal workbench. The adjustable support structure is used to adjust to above and below the rollers to form a walking state and a supporting state. An electrical cabinet is provided in the middle below the horizontal workbench for installing various electrical components.

[0042] The X-axis motion mechanism and the Y-axis motion mechanism are respectively provided with grating sensors for measuring the displacement of the electric push rod mechanism in the X-axis and Y-axis directions. The grating sensor signals are electrically connected to the motion control system to form a closed-loop control.

[0043] The X-axis motion mechanism, the Y-axis motion mechanism and the electric push rod mechanism are respectively provided with limit sensors for limiting the motion stroke limit.

[0044] A threaded mounting hole is provided axially at the end of the push rod of the electric push rod mechanism, and a screw is provided axially at the simulated bullet head and is threadedly connected to the threaded mounting hole.

[0045] The push rod of the electric push rod mechanism is a hollow rod, the inner hole of the push rod is connected with the threaded mounting hole, and a laser collimating sight is installed in the inner hole of the push rod.

[0046] See also Figure 1a 、 Figure 1b , an embodiment of a light curtain target spatial plane coordinate position accuracy calibration device, the light curtain target spatial plane coordinate position accuracy calibration device uses a grating precision displacement measurement system as a standard quantity, the calibration software uses predetermined calibration coordinate points or randomly generates calibration coordinate points and moves to the corresponding coordinate positions, and the electric push rod simulates the bullet passing through and blocking the light curtain target to calibrate the error of the light curtain target being tested. This system adopts the principle of precise displacement comparison measurement for measurement.

[0047] Design technical parameter requirements for the calibration device:

[0048] (1) Impact point coordinate measurement range: X direction: 0~1000mm; Y direction: 0~1000mm;

[0049] (2) Coordinate position control error: ±0.2 mm;

[0050] (3) X-axis (horizontal axis) and Y-axis (vertical axis) motion positioning error: ±0.05mm;

[0051] (4) X-axis and Y-axis motion straightness (up and down direction of guide rail surface): ±0.05mm;

[0052] (5) The electric push rod has a travel range of 150 mm.

[0053] The maximum measuring stroke of the calibration device in the X and Y axis directions is 1000mm. Taking into account the dimensions of the motion slide, screw support seat, limit switch, motor and coupling, the actual length of the X axis reaches 1500mm, the actual length of the Y axis reaches 1400mm, and the height reaches 1700mm. Such a large-scale and large-scale two-dimensional CNC motion mechanism, and the need to consider the transportation and installation for on-site measurement, bring great difficulties to the structural design.

[0054] While gantry-style motion mechanisms offer the advantage of structural stability, they are bulky and heavy, making the measuring machine difficult to transport. Therefore, a lighter T-shaped structure was adopted. However, this structure suffers from poor load-bearing properties, potentially causing slight wobble at the tip of the Y-axis during high-speed motion. Unlike machine tools, this calibration device utilizes only a single electric push-rod mechanism on the measuring machine's Y-axis, effectively eliminating any loads. Furthermore, since this measuring machine does not require high-speed motion, the effects of this wobble can be ignored when designing the motion control system, as long as the acceleration and deceleration are smooth during startup and shutdown.

[0055] See also Figure 2To facilitate on-site calibration and transportation, the Y-axis motion mechanism is designed to be erected and laid down. The column support consists of a hinged vertical portion and a mounting portion. The mounting portion has a slot and a platform on the vertical portion, which are secured with bolts after engagement.

[0056] In addition to the X-axis motion mechanism itself, the X-axis motion mechanism also includes a working slide for mounting a fixed Y-axis. The AC servo motor driver, motion controller, limit sensor, grating sensor electrical control box and connectors of the entire motion control system (X, Y, and Z coordinates) are all installed in the electrical control box at the bottom of the machine body.

[0057] The X-axis motion mechanism is designed with a manual lift mechanism that allows the entire mechanism to be raised and lowered, facilitating adjustments during calibration of light curtain targets at varying bull's-eye heights. It is also equipped with four wheels for ease of transport. To ensure accuracy and reduce weight, the worktable of the X-axis motion mechanism, which primarily bears the weight, utilizes a self-contained screw-guide assembly to minimize the size and weight of its mechanical moving parts. The design and manufacturing process minimized wall thickness while maintaining rigidity and strength, and employed a hollow design.

[0058] To facilitate on-site installation, the Y-axis motion mechanism also adopts a compact and lightweight design, using a self-contained screw guide assembly to minimize the size and weight of its mechanical moving parts. Due to the structural design of the self-contained screw guide assembly, the column for mounting the Y-axis motion mechanism also serves as the mechanical mounting base for the assembly, reducing the weight of a single column design. At the same time, a hollow design is used to reduce weight while ensuring rigidity and deformation resistance.

[0059] To facilitate on-site installation, the Y-axis motion mechanism is designed as an independent component. The power, control, and signal lines for the AC servo motor, grating sensor, and limit sensor installed on it are all rationally arranged, leaving only plug-in connectors for connection to the electrical control box. The electrical motion control system is installed in the electrical control box below the X-axis motion mechanism. This measuring machine does not adopt the traditional control cabinet structure. The motor controller, motion controller, grating sensor interface, limit switch sensor interface, power supply, etc. are all placed in the control box below the measuring machine base, making it easy to move the entire unit for on-site measurement. Once on site, there is no need to connect any control signal lines or sensor signal lines before starting measurement.

[0060] See also Figure 3The bullet clamping mechanism uses a precision lead screw with a 6mm lead and a small precision linear guide to form a rapid bullet movement mechanism. The bullet clamping mechanism uses a spiral mechanism with concentric cylindrical positioning to fix the bullet, which has the advantages of high concentricity and quick and convenient replacement and clamping. After adopting the self-assembled lead screw guide structure, its structure is compact, and the ball retainer is used inside the guide rail to eliminate the collision sound between the steel balls, and the noise is low. The self-assembled lead screw guide is selected, with a lead screw of 6mm and a diameter of 8mm. The structure is compact, about 50×45mm, and weighs 2kg. The maximum speed of the AC servo motor is 3000 rpm, and the maximum linear displacement speed can reach 300mm / s. It only takes about 1 second to complete a rapid telescopic action of 150mm stroke.

[0061] A laser diode-based laser alignment sight, mounted at the same location as the projectile push rod, is used to locate the actual target's center before measurement begins, aligning the center of the calibrated light curtain target with the center of the calibration device. This device easily aligns the centers of the calibration device and the target when calibrating light curtain targets at varying target heights. Due to closed-loop control, its positioning accuracy is independent of the ball screw's manufacturing tolerances, achieving high positioning precision.

[0062] (1) AC servo motor and driver

[0063] The motion control system of the calibration device adopts AC servo motor and driver of Japan Yaskawa Electric Corporation (YASKAWA), such as Figure 4a Model specifications: Y-axis adopts SGMJV-04ADE6S / 400W, equipped with driver SGDV-2R8A, X-axis adopts SGMJV-08ADE6S / 750W, equipped with driver SGDV-5R5A, electric push rod adopts SGMJV-01ADC6S / 100W, equipped with driver SGDV-R90A;

[0064] Yaskawa Electric Corporation of Japan, a professional manufacturer in the field of motion control, selected Yaskawa AC servo motors for their fast response, which helps improve the stability of mechanical motion and reduces vibration during driving and at the front end of the machine when stopped. They offer the highest amplifier responsiveness in the industry, significantly reducing settling time. Their new single-parameter tuning function reduces the settling time to approximately 0 to 4 ms, achieving the required fast and smooth response.

[0065] (2) Motion controller

[0066] The motion controller uses the TRIOP827-MC405 three-axis motion controller from Trio Motion Technology Ltd. (UK). The MC405 is a portable, high-performance motion coordination controller. It features a powerful ARM11 processor with a 533MHz clock frequency, 64-bit floating-point capabilities, and five encoder feedback inputs with an input frequency of up to 6MHz. The controller offers three-loop vector control capabilities: position, velocity, and current loops. The output of the velocity loop provides the reference signal for the current loop, and the output of the position loop provides the reference signal for the velocity loop. The metal chassis enhances the system's grounding performance and improves its anti-interference capabilities in industrial environments.

[0067] The MC405 motion controller has three communication control interfaces: traditional serial communication, USB, and Ethernet. This project uses the MC405 motion controller's advanced Ethernet communication mode to control the AC servo motor's motion. Communication via the Ethernet port is more reliable.

[0068] If the output pulse of the original grating encoder equipped with an AC servo motor reaches 1 million / rev, very small feed control can be achieved. However, the semi-closed-loop motion control system composed of the encoder equipped with the AC servo motor will produce positioning errors due to the lead error of the screw. In order to overcome the lead error of the screw, the output signal of the encoder is not used as a position feedback signal. This patent application uses a long grating displacement sensor as a position feedback signal to be sent to the motion controller to form a closed-loop motion control system.

[0069] To prevent overtravel in the motion control system due to human error or circuit failure, which could damage the calibration device, limit switches are designed for the left and right travel limits of the X-axis, the vertical travel limits of the Y-axis, and the forward and backward travel limits of the electric actuator. Electromagnetic induction sensors are used as limit control switches, replacing traditional mechanical limit switches. They offer advantages such as compact size, high sensitivity, and high reliability. A magnetic induction sensor from Omron Japan is used as the limit switch. When the limit detector reaches 2.5 mm from the magnetic sensor, the magnetic sensor activates and stops the motion controller, providing non-contact and rapid operation.

[0070] (3) Grating length standard measurement system

[0071] The calibration device needs to be used on-site, so the length standard measurement system adopts a precision grating displacement sensor measurement system. The grating sensor has high accuracy and good stability, and has relatively loose requirements on the use environment, which can meet the requirements of on-site measurement.

[0072] The closed-loop motion control system utilizes a Renishaw steel tape grating sensor, model RGH22X30, for position measurement and feedback. Its output pulse equivalent is 1μm, exceeding the 5μm pulse equivalent of the original solution. Although open-type steel tape grating sensors offer limited contamination resistance, this measurement system is not used for machining and is free of contamination sources such as iron filings, oil, and coolant, thus meeting the calibration measurement requirements.

[0073] 2.2 Development of measurement control and data acquisition system for calibration device

[0074] The block diagram of the calibration device measurement control and data acquisition system is as follows: Figure 4b As shown, its working principle is as follows:

[0075] The plane coordinate position movement of the calibration mechanism is controlled by a computer via a network port, using an MC405 three-axis motion controller. Data communication between the computer and the three-axis motion controller is achieved via a network cable. The X- and Y-axis AC servo motors are controlled by their respective drive circuits, respectively, to produce two-dimensional planar motion. Simultaneously with the movement of the X- and Y-axis motion mechanisms, grating sensors installed on these axes output grating signals, which are then fed through preamplification, subdivision circuitry, and direction determination circuitry to the motion controller for closed-loop feedback control.

[0076] The left and right limit positions of the X-axis and the upper and lower limit positions of the Y-axis are equipped with electromagnetic induction sensors as limit travel control switches. The four limit sensor signals of the X-axis and Y-axis are processed by the signal conditioning circuit and input into the motion controller. When the limit position is reached due to a fault, the motion control system can realize emergency stop to avoid damage to the measuring machine and accidents caused by exceeding the limit of the motion position.

[0077] 220V AC power passes through a protective circuit breaker, is filtered out of electromagnetic interference by a noise filter, and is provided to the AC servo motor as the main power supply through an electromagnetic contactor and a surge suppressor. Another 24V DC power supply is used as the control power supply for the driver.

[0078] The motion control system controls the calibration device to precisely move to the set coordinate position, and then controls the electric push rod to simulate the rapid movement of the projectile. The motion control system controls the electric push rod to move back and forth quickly by providing forward and reverse motion and displacement control parameters through the drive circuit, completing the movement of the projectile mounted on the electric push rod into and out of the target being tested.

[0079] The movement speed and movement displacement length of the electric push rod are set by the control software. The movement stroke is controlled by giving the target displacement, and the round-trip speed of the electric push rod is controlled by setting the acceleration and speed parameters. The maximum motor speed can be set to 3000 rpm, which is equivalent to a linear displacement speed of 300mm / s.

[0080] The bullet on the electric push rod enters the light curtain target under test. The corresponding detection data of the light curtain target is uploaded to the host computer through the data acquisition and transmission circuit (the light curtain target needs to provide a data interface) for data analysis by the host computer. The calibration mechanism uses a high-precision grating sensor as a standard. The plane coordinates composed of X and Y axis motion are calculated and analyzed and compared with the output data of the light curtain target under test to determine the error of the test light curtain target.

[0081] A method for calibrating the spatial plane coordinate position accuracy of a light curtain target

[0082] 3. Development of software for the calibration and measurement device for the spatial coordinate position accuracy of the light curtain target

[0083] 3.1 Overall software design architecture

[0084] Development of specialized calibration software for the spatial plane coordinate position accuracy of light weapons impact points, including four modules: data management, motion control, calibration measurement, and certificate printing.

[0085] The calibration software includes motion control of the calibration coordinate point at any position in the spatial plane, conversion of the origin coordinates of the calibration device and the light curtain target, error calculation of the calibrated coordinate point, graphical display of the distribution of the measurement values ​​of the calibration coordinate point, automatic generation of various indicators and graphics of the target density, reference to the density test standards in the national military standard, calculation of the measurement error of the calibrated invisible target density index, the scatter circle radius and the average scatter circle radius, the average hit radius and the total scatter. It also automatically generates calibration records and calibration certificate reports, and manages the measurement database. The overall architecture design module of the calibration software is shown in the figure below. Figure 5 shown.

[0086] 3.2、Motion control software design and functional modules, the motion control software design functional module block diagram is shown in Figure 6 .

[0087] 3.3、Calibration measurement software design and functional modules. The block diagram of each functional module of the calibration measurement software is shown in Figure 7 , the block diagram of the repeatability measurement function module of the calibration measurement software is shown in Figure 8 .

[0088] 3.4 Impact point measurement and analysis software design and functional modules

[0089] The impact point measurement and analysis software includes coordinate conversion between the calibration device and the light curtain target origin, calibration data import, error calculation of the calibrated coordinate points, graphical display of the distribution of measured values ​​at the calibration coordinate points, automatic generation of various light curtain target density indicators and graphs, and calculation of the measurement error, spread circle radius, average spread circle radius, average impact radius, and total spread of the calibrated invisible target density indicators, referencing the density test standards of the national military standard. Measurement and analysis records are automatically generated.

[0090] The overall architecture design module of the impact point measurement and analysis software, such as Figure 9 shown.

[0091] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for calibrating the spatial plane coordinate position accuracy of a light curtain target, characterized by: The calibration device includes a two-dimensional displacement motion mechanism, an electric push rod mechanism, and a motion control system of the two-dimensional displacement motion mechanism and the electric push rod mechanism. The electric push rod mechanism is installed on the two-dimensional displacement motion mechanism, and the push rod end of the electric push rod mechanism is installed with a simulated bullet for entering and exiting the light curtain; The two-dimensional displacement motion mechanism includes an X-axis motion mechanism for controlling the electric push rod mechanism to move in the horizontal direction, and a Y-axis motion mechanism for controlling the electric push rod mechanism to move in the vertical direction, and the electric push rod mechanism is perpendicular to the X-axis motion mechanism and the Y-axis motion mechanism; The X-axis motion mechanism includes a horizontal workbench, the Y-axis motion mechanism includes a column support, the X-axis motion mechanism and the Y-axis motion mechanism each include a screw-nut mechanism and an AC servo motor, the column support is mounted on the horizontal workbench, the X-axis motion mechanism drives the column support to move in the horizontal direction through the screw-nut mechanism and the AC servo motor, and the column support drives the electric push rod mechanism to move in the vertical direction through the screw-nut mechanism and the AC servo motor; The X-axis motion mechanism and the Y-axis motion mechanism are respectively provided with grating sensors for measuring the displacement of the electric push rod mechanism in the X-axis and Y-axis directions. The grating sensor signals are electrically connected to the motion control system to form a closed-loop control; The end of the push rod of the electric push rod mechanism is provided with a threaded mounting hole along the axial direction, and the simulated bullet is provided with a screw along the axial direction and is threadedly connected to the threaded mounting hole; The push rod of the electric push rod mechanism is a hollow rod, the inner hole of the push rod is connected to the threaded mounting hole, and a laser collimation sight is installed in the inner hole of the push rod; It also includes a light curtain target, which is parallel to the X-axis motion mechanism and the Y-axis motion mechanism, and the simulated warhead faces the light curtain target. The accuracy calibration method includes: Inputting calibration coordinate points into the motion control system, or randomly generating calibration coordinate points by the motion control system, wherein the calibration coordinate points are plane coordinate points of the plane where the X-axis motion mechanism and the Y-axis motion mechanism are located; The motion control system controls the two-dimensional displacement motion mechanism to operate, so that the electric push rod mechanism moves to the calibration coordinate point; The motion control system controls the electric push rod mechanism to operate, so that the simulated bullet is shot into and out of the light screen target to be tested, thereby obtaining the calibrated coordinate points of the light screen target to be tested; Analyze and compare the calibration coordinate points and the calibrated coordinate points to obtain the error of the light curtain target being tested; Using the calibration coordinate point as the standard, calibrate the error of the light curtain target being tested; The motion control system includes a computer and a three-axis motion controller. The computer and the three-axis motion controller are connected by a network cable for data communication. The computer controls the three-axis motion controller through the network port. When the simulated warhead enters the light curtain target to be tested, the calibrated coordinate point data is uploaded to the computer via the data acquisition and transmission circuit. The computer calculates, analyzes and compares the calibration coordinate point and the calibrated coordinate point to obtain the error of the light curtain target to be tested. The computer has built-in calibration software to calculate, analyze and compare the calibration coordinate points and the calibrated coordinate points of the light curtain target; Rollers and adjustable support structures are respectively provided at both ends below the horizontal workbench. The adjustable support structure is used to be adjusted above and below the rollers to form a walking state and a supporting state. An electrical cabinet is provided in the middle below the horizontal workbench for installing various electrical components. The X-axis motion mechanism, the Y-axis motion mechanism and the electric push rod mechanism are respectively provided with limit sensors for limiting the motion stroke limit.

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