Automatic test system and method for magnetostrictive sensor

Abstract

The invention provides an automatic testing system and method for a magnetostrictive sensor, and relates to the technical field of industrial automation and sensor testing, and the system comprises a marble working platform, a product positioning jig, a laser ranging system, a movement mechanism, an electric testing system, a product supporting mechanism and a host control system. The marble working platform provides a stable testing environment; the product positioning jig fixes the sensor; the laser ranging system (comprising a laser interference range finder and a temperature compensator) measures distance data; the movement mechanism moves the magnetic ring jig to change the relative position of the sensor and the magnetic ring; the electrical logging system collects sensor electrical signal data; the product supporting mechanism is used for adjusting the product mounting levelness; and the host control system uniformly controls the operation of each subsystem, analyzes data and gives out a judgment result. According to the invention, the defects of the existing test method are effectively overcome, and the test precision and efficiency of the magnetostrictive sensor are improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial automation and sensor testing, and in particular to an automatic testing system and method for a magnetostrictive sensor. Background Art

[0002] In the production process of magnetostrictive sensors, distance calibration and final testing of products are key steps to ensure that product performance meets customer needs. However, these two links have significant challenges and limitations in traditional operation modes.

[0003] During the product calibration process, the operator needs to manually move the magnetic ring to a standard position (usually 1 / 2 range position) and calibrate the electrical signal at this time to the corresponding range value through software. This process is difficult to avoid visual errors and operational errors when personnel move the position to confirm 1 / 2 range, resulting in the calibration size not meeting the product function. Especially when producing long-distance products, the distance that personnel need to move the magnetic ring is long, which is inconvenient to operate and easy to introduce errors. In addition, when the final test confirms the product accuracy, the test moving mechanism (such as a stepper or servo motor with a lead screw) will also be affected by various factors when reading several fixed point displacement data and comparing with the output electrical signal of the sensor to confirm the linear relationship. In the actual production of the sensor, there are certain differences in the propagation speed of the pulse at different positions of the waveguide wire, and there are also certain differences when the product electronic warehouse processes the pulse calculation and converts it into an electrical signal, so that the actual displacement and the electrical signal are not completely linear. For high-precision magnetostrictive sensors, the resolution is required to reach the micron level and the repeatability accuracy must reach 0.001%. The error influence of the lead screw movement cannot guarantee the repeatability accuracy of the test, so the traditional method cannot be applied to product testing with high-precision requirements.

[0004] When the sensor needs a longer effective stroke, the installed product may have a certain inclination angle, which makes the position offset greater when the distance is longer during measurement, resulting in calibration or measurement errors. Or because the working part of the product has a longer rod, there is a certain deflection and deformation of the slender rod, which affects the accuracy of calibration and measurement. In addition, the traditional test main controller generally uses a traditional PLC, but the communication interface between the PLC and the lower equipment (such as CAN, SSI, EtherCAT) is more difficult to implement than PC control, and the PLC has limited ability to trace and store data. During the test, the data needs to be manually recorded and saved, and the personnel judge whether the data meets the requirements. This process is prone to errors and is time-consuming. It cannot meet the customer's requirements for one-to-one correspondence between products and data and convenient tracking and query.

[0005] In summary, the existing magnetostrictive sensor testing methods have many shortcomings, including large manual operation errors, unsuitability for high-precision long-distance testing, and error-prone and time-consuming data recording. A new type of automatic testing system is urgently needed to overcome these limitations. Summary of the invention

[0006] To this end, an embodiment of the present invention provides a magnetostrictive sensor automatic testing system and method, which is used to solve many shortcomings of existing magnetostrictive sensor testing methods, including large manual operation errors, unsuitability for high-precision long-distance testing, and error-prone and time-consuming data recording.

[0007] In order to solve the above problems, an embodiment of the present invention provides a magnetostrictive sensor automatic testing system, which includes a marble working platform, a product positioning fixture, a laser ranging system, a motion mechanism, an electrical measurement system, a product lifting mechanism and a host control system;

[0008] The marble work platform is used as a reference surface to provide a stable test environment for the test system; the product positioning fixture is installed on the marble work platform to fix the magnetostrictive sensor to be tested to ensure the stability of the test position; the laser distance measurement system includes a laser interferometer distance meter and a temperature compensator, which are used to measure the distance data of the magnetostrictive sensor to be tested, and send the measured distance data to the host control system for analysis; the motion mechanism is installed on the marble work platform and connected to the host control system, and is used to receive control instructions to move, carry and move the magnetic ring fixture, and realize the relative position change between the magnetostrictive sensor to be tested and the magnetic ring fixture; the electrical measurement system is connected to the host control system, and is used to collect the electrical signal data of the magnetostrictive sensor to be tested, and send the collected electrical signal data to the host control system for analysis; the product lifting mechanism includes a level lifting platform, a digital display inclinometer and a product long rod electric cylinder lifting mechanism, which are used to adjust the installation level of the product; the host control system is electrically connected to the electrical measurement system, the laser distance measurement system, the motion mechanism and the product lifting mechanism, and is used to control the operation of the laser distance measurement system, the motion mechanism, the electrical measurement system and the product lifting mechanism, analyze the test data and give a judgment result.

[0009] Preferably, the product positioning fixture is designed as a V-shaped quick positioning structure, which is suitable for magnetostrictive sensors of different shapes.

[0010] Preferably, the temperature compensator in the laser ranging system is used to sense the actual temperature of the environment and feed back the temperature change to the laser interferometer rangefinder through a compensation coefficient.

[0011] Preferably, the motion mechanism is moved by a linear motor module mechanism, and the position information is monitored and fed back in real time by a grating encoder to ensure that the static jitter range is within the error range of the laser interferometer.

[0012] Preferably, the electrical testing system comprises a power supply and a sensor electrical signal testing instrument, wherein the sensor electrical signal testing instrument is used to collect electrical signal data of the magnetostrictive sensor to be tested.

[0013] Preferably, the product long rod electric cylinder lifting mechanism in the product lifting mechanism controls the product positioning fixture to lift the height of the product long rod through multiple electric cylinders, eliminates the deflection deformation of the product long rod, and cooperates with the digital inclinometer to confirm that the product installation is parallel to the motion mechanism.

[0014] Preferably, the host control system is used to control the operation of the laser ranging system, the motion mechanism, the electrical measurement system and the product lifting mechanism, analyze the test data and give the determination result, specifically including:

[0015] The host control system communicates with the electric measurement system through electrical connection to control the start, stop and data collection of the electric measurement system; the host control system establishes communication with the laser ranging system to control the start, stop and ranging operation of the laser interferometer rangefinder, and receives real-time temperature data sent by the temperature compensator to perform temperature compensation on the ranging data of the laser interferometer rangefinder; the host control system realizes the precise movement of the magnetic ring fixture by controlling the motion mechanism; the host control system receives and analyzes the data of the electric measurement system and the laser ranging system, makes a conformity judgment, and gives a judgment result.

[0016] Preferably, the host control system is also used to provide a user interface, allowing the user to set test parameters, including test speed, test distance, and test times; during the test process, the test data and progress are displayed in real time through the user interface; after the test is completed, a detailed test report is generated, including test data, judgment results, and suggestions

[0017] The embodiment of the present invention further provides a magnetostrictive sensor automatic testing method, which adopts the magnetostrictive sensor automatic testing system described above, and specifically includes:

[0018] The operator installs the magnetostrictive sensor to be tested on the product positioning fixture to ensure that the position of the magnetostrictive sensor to be tested is stable;

[0019] Select the model of the magnetostrictive sensor to be tested on the test software of the host control system, enter the serial number of the magnetostrictive sensor to be tested, click the Start Test button to start the test process, and the data of the grating encoder and the laser interferometer rangefinder will be reset to zero;

[0020] The host control system controls the motion mechanism through the linear motor module mechanism to start moving, driving the magnetic ring fixture to move relative to the magnetostrictive sensor to be tested. The magnetic ring fixture controls the precise movement of the linear motor module mechanism through the grating encoder according to the program setting;

[0021] The electrical measurement system collects the electrical signal data of the magnetostrictive sensor to be tested in real time and sends it to the host control system. At the same time, the laser distance measurement system synchronously measures the actual distance data between the magnetostrictive sensor to be tested and the magnetic ring fixture;

[0022] The motion mechanism stops moving and then starts to retreat, driving the magnetic ring fixture back to the zero position;

[0023] During the retraction process, the laser interferometer continuously measures the distance data, and the host control system determines the conformity between the measured distance value fed back by the laser interferometer and the distance value calibrated by the electrical signal; based on the determination result, the host control system determines whether the magnetostrictive sensor to be tested is qualified and gives corresponding prompts;

[0024] The host control system saves the test data according to the product serial number. The data includes composite judgment data and charts of electrical signal data, encoder feedback distance, and laser interferometer distance feedback distance, and automatically generates a test report.

[0025] The operator removes the magnetostrictive sensor to be tested from the product positioning fixture and places it into the corresponding material box according to the prompt of the host control system.

[0026] Preferably, during the movement of the motion mechanism, when the program determines that the magnetic ring fixture is close to the electric cylinder, the corresponding electric cylinder is lowered, and after the magnetic ring fixture passes, the electric cylinder rises again to hold the product long rod to ensure the continuity and accuracy of the test.

[0027] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0028] (1) High precision and reliability: The present invention achieves accurate measurement from millimeter to micrometer level by integrating a marble work platform, a laser distance measurement system (including a high-precision laser interferometer distance meter and a temperature compensator) and a high-performance electrical measurement system. This high-precision measurement capability ensures the accuracy and reliability of the test results, and is particularly suitable for products such as magnetostrictive sensors that require high-precision calibration and testing. At the same time, the system adopts non-contact measurement, which effectively avoids damage to the object being measured.

[0029] (2) High degree of automation and intelligence: The magnetostrictive sensor automatic test system provided by the present invention has high degree of automation and intelligence. Through the unified scheduling of the host control system, each subsystem can work together to automatically complete the test process. During the test, the system can automatically collect data, analyze data and give judgment results without human intervention. This highly automated test method not only improves the test efficiency, but also eliminates the possibility of human misjudgment.

[0030] (3) Data traceability and improved production efficiency: In the present invention, the host control system is not only responsible for controlling the operation of each subsystem, but also for data storage and management. The test data can be automatically saved according to the sensor serial number, and the data contains detailed information such as electrical signal data, encoder feedback distance, and composite judgment data and charts of laser interferometer distance feedback. This data traceability provides strong support for product quality control and performance analysis. At the same time, since the calibration and test functions are integrated on the same device, the measurement error caused by two installations is eliminated, and production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation cases of the present invention or the technical solutions in the prior art, the following is a brief description of the drawings required for use in the embodiments. By referring to the drawings, the features and advantages of the present invention will be more clearly understood. The drawings are schematic and should not be understood as limiting the present invention in any way. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0032] Figure 1 A schematic structural diagram of an automatic testing system for a magnetostrictive sensor provided in an embodiment;

[0033] Figure 2 The figure is a flow chart of an automatic testing method for a magnetostrictive sensor provided in an embodiment.

[0034] Explanation of the reference numerals in the specification: 10. marble working platform; 20. product positioning fixture; 30. laser distance measuring system; 31. laser interferometer distance measuring instrument; 32. temperature compensator; 40. motion mechanism; 50. electrical measuring system; 60. product lifting mechanism; 70. host control system; 80. magnetic ring fixture. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] In order to solve the many shortcomings of the existing magnetostrictive sensor testing methods, including large manual operation errors, unsuitability for high-precision long-distance testing, and error-prone and time-consuming data recording. Figure 1 As shown, an embodiment of the present invention provides an automatic testing system for a magnetostrictive sensor, which includes a marble working platform 10, a product positioning fixture 20, a laser ranging system 30, a motion mechanism 40, an electrical measurement system 50, a product lifting mechanism 60 and a host control system 70.

[0038] The marble work platform 10, as a reference surface, is used to provide a stable test environment for the test system. The product positioning fixture 20 is installed on the marble work platform and is used to fix the magnetostrictive sensor to be tested to ensure the stability of the test position. The laser distance measurement system 30 includes a laser interferometer distance meter 31 and a temperature compensator 32, which are used to measure the distance data of the magnetostrictive sensor to be tested, and send the measured distance data to the host control system 70 for analysis. The motion mechanism 40 is installed on the marble work platform 10 and is connected to the host control system 70. It is used to receive control instructions to move, carry and move the magnetic ring fixture, and realize the relative position change between the magnetostrictive sensor to be tested and the magnetic ring fixture 80. The electrical measurement system 50 is connected to the host control system 70, and is used to collect the electrical signal data of the magnetostrictive sensor to be tested, and send the collected electrical signal data to the host control system 70 for analysis. The product lifting mechanism 60 includes a level lifting platform, a digital display inclinometer and a product long rod electric cylinder lifting mechanism, which are used to adjust the installation level of the product. The host control system 70 is electrically connected to the laser ranging system 30, the motion mechanism 40, the electrical measurement system 50, and the product lifting mechanism 60, and is used to control the operation of the laser ranging system 30, the motion mechanism 40, the electrical measurement system 50, and the product lifting mechanism 60, analyze the test data and give a judgment result.

[0039] It can be seen from the above technical scheme that the present invention proposes an automatic testing system for magnetostrictive sensors, including a marble working platform, a product positioning fixture, a laser ranging system, a motion mechanism, an electrical measurement system, a product lifting mechanism and a host control system. The system integrates a high-precision marble working platform, a laser ranging system (including temperature compensation) and a high-performance electrical measurement system to achieve precise measurement from millimeters to micrometers, ensuring the accuracy and reliability of the test results. At the same time, the system is highly automated and intelligent, and the host control system uniformly dispatches each subsystem to automatically complete the test process, improve test efficiency and eliminate human misjudgment. In addition, the host control system is also responsible for data storage and management, achieving data traceability, and providing support for product quality control and performance analysis. This system integrates calibration and testing functions, eliminates the measurement errors caused by two installations, and further improves production efficiency. The present invention effectively solves the shortcomings of existing testing methods and improves the test accuracy and efficiency of magnetostrictive sensors.

[0040] In this embodiment, the marble work platform 10 uses a 000-level vibration-isolating marble platform, and the length can be set as needed, preferably 4 meters. The marble work platform 10 is used as a reference surface to provide a stable test environment for the test system.

[0041] In this embodiment, the product positioning fixture 20 is installed on the marble work platform 10 to fix the magnetostrictive sensor to be tested to ensure the stability of the test position. Further, the product positioning fixture 20 is designed as a V-shaped fast positioning structure, which is suitable for magnetostrictive sensors of different shapes.

[0042] In this embodiment, the laser distance measurement system 30 is used to measure the distance data of the magnetostrictive sensor to be tested, and send the measured distance data to the host control system 70 for analysis. The laser distance measurement system 30 includes a high-precision laser interferometer distance meter 31 and a temperature compensator 32. The measurement environment is 20°C to 25°C. To ensure the high precision of the laser interferometer distance meter 31, the temperature compensator 32 senses the actual temperature of the environment, and feeds back the temperature change to the laser interferometer distance meter 31 through the compensation coefficient to ensure the accuracy of the measurement result.

[0043] In this embodiment, the motion mechanism 40 is installed on the marble work platform 10 and connected to the host control system 70, and is used to receive control instructions to move, carry and move the magnetic ring fixture 80, and realize the relative position change between the magnetostrictive sensor to be tested and the magnetic ring fixture 80. Preferably, the motion mechanism 40 adopts a linear motor module mechanism with high-speed micron-level positioning accuracy to ensure that the static jitter range is within the error range of the laser interferometer rangefinder. Smaller static jitter can ensure the consistency of the difference between the measured value and the output of the laser interferometer rangefinder 31 for each test point. The error range formula of the laser interferometer rangefinder 31 is ±0.5Lμm, where L is the measured length (L is in m), for example, the measured length is 300mm (0.3m), and the error is ±0.15μm.

[0044] In this embodiment, the electrical measurement system 50 is connected to the host control system 70, and is used to collect electrical signal data of the magnetostrictive sensor to be tested, and send the collected electrical signal data to the host control system 70 for analysis. Further, the electrical measurement system 50 includes a programmable high-precision power supply and a sensor electrical signal test instrument, wherein the sensor electrical signal test instrument is used to collect electrical signal data of the magnetostrictive sensor to be tested.

[0045] In this embodiment, the product lifting mechanism 60 is used to adjust the installation height and levelness of the magnetostrictive sensor to be tested to ensure that the measurement complies with the Abbe principle. The product lifting mechanism 60 includes a level lift, a digital inclinometer, and a product long rod electric cylinder lifting mechanism, wherein the product positioning fixture 20 is fixed on the level lift, and the level lift can adjust the product installation height through the fine-tuning knob. The product long rod electric cylinder lifting mechanism controls the V-shaped product positioning fixture 20 through multiple (preferably 8) high-precision electric cylinders to lift the product long rod height, eliminate the deflection deformation of the product long rod, and cooperate with the digital inclinometer to confirm that the product installation is parallel to the motion mechanism 40. The lifting of the electric cylinder is controlled by a program. When the magnetic ring fixture 80 moves close to one of the electric cylinders, the electric cylinder is lowered to allow the magnetic ring fixture 80 to pass smoothly. After the magnetic ring fixture 80 passes, the electric cylinder rises again to support the product long rod.

[0046] In this embodiment, the host control system 70 is electrically connected to the laser ranging system 30, the motion mechanism 40, the electrical measurement system 50, and the product lifting mechanism 60, and is used to control the operation of the laser ranging system 30, the motion mechanism 40, the electrical measurement system 50, and the product lifting mechanism 60, analyze the test data, and give a determination result, specifically including:

[0047] The host control system 70 communicates with the electrical measurement system 50 through electrical connection, and controls the start, stop and data collection of the electrical measurement system 50. The host control system 70 establishes communication with the laser ranging system 30, controls the start, stop and ranging operation of the laser interferometer rangefinder 31, and receives the real-time temperature data sent by the temperature compensator 32, and performs temperature compensation on the ranging data of the laser interferometer rangefinder 31. The host control system 70 realizes the precise movement of the magnetic ring fixture 80 by controlling the motion mechanism 40. The host control system 70 receives and analyzes the data of the electrical measurement system 50 and the laser ranging system 30, makes a conformity judgment, and gives a judgment result.

[0048] Specifically, the host control system 70 is implemented by an industrial computer, including a readable storage medium and a host control software system. The readable storage medium is used for software installation and data access. The host control software system includes four modules: sensor model identification input, data acquisition, analysis and calculation, and storage. By controlling the linear motor to calibrate the distance, the laser interferometer rangefinder 31 is used to test the actual distance data and electrical signal data through the data acquisition interface, and the data of the two are compared and recorded. It is determined whether the data is within the specification range and a judgment result is given, and the data is saved on a readable storage medium.

[0049] In addition, the host control system 70 is also used to provide a user interface, allowing the user to set test parameters, such as test speed, test distance, test times, etc. During the test process, the test data and progress are displayed in real time through the user interface, which is convenient for the user to understand the test situation. After the test is completed, a detailed test report is generated, including information such as test data, judgment results and suggestions.

[0050] The magnetostrictive sensor automatic test system of the present invention can significantly improve the accuracy and reliability of the test, reduce human operation errors, and improve production efficiency. At the same time, through automatic data comparison and judgment, the possibility of human misjudgment can be eliminated, and the test data can be automatically saved, the traceability is enhanced, and a strong support is provided for product quality control and performance analysis.

[0051] Embodiment 2

[0052] like Figure 2 As shown, the present invention provides an automatic testing method for a magnetostrictive sensor, which adopts the automatic testing method for a magnetostrictive sensor of the first embodiment, and specifically includes:

[0053] The operator installs the magnetostrictive sensor to be tested on the product positioning fixture to ensure that the position of the magnetostrictive sensor to be tested is stable;

[0054] Select the model of the magnetostrictive sensor to be tested on the test software of the host control system, enter the serial number of the magnetostrictive sensor to be tested, click the Start Test button to start the test process, and the data of the grating encoder and the laser interferometer rangefinder will be reset to zero;

[0055] The host control system controls the motion mechanism through the linear motor module mechanism to start moving, driving the magnetic ring fixture to move relative to the magnetostrictive sensor to be tested. The magnetic ring fixture controls the precise movement of the linear motor module mechanism through the grating encoder according to the program setting;

[0056] The electrical measurement system collects the electrical signal data of the magnetostrictive sensor to be tested in real time and sends it to the host control system. At the same time, the laser distance measurement system synchronously measures the actual distance data between the magnetostrictive sensor to be tested and the magnetic ring fixture;

[0057] The motion mechanism stops moving and then starts to retreat, driving the magnetic ring fixture back to the zero position;

[0058] During the retraction process, the laser interferometer continuously measures the distance data, and the host control system determines the conformity between the measured distance value fed back by the laser interferometer and the distance value calibrated by the electrical signal; based on the determination result, the host control system determines whether the magnetostrictive sensor to be tested is qualified and gives corresponding prompts;

[0059] The host control system saves the test data according to the product serial number. The data includes composite judgment data and charts of electrical signal data, encoder feedback distance, and laser interferometer distance feedback distance, and automatically generates a test report.

[0060] The operator removes the magnetostrictive sensor to be tested from the product positioning fixture and places it into the corresponding material box according to the prompt of the host control system.

[0061] Specifically, during the movement of the motion mechanism, when the program determines that the magnetic ring fixture is close to the electric cylinder, the corresponding electric cylinder will be lowered. After the magnetic ring fixture passes, the electric cylinder will rise again to support the long rod of the product to ensure the continuity and accuracy of the test.

[0062] The magnetostrictive sensor automatic testing method of the present embodiment adopts the aforementioned magnetostrictive sensor automatic testing system. Therefore, the specific implementation method of the magnetostrictive sensor automatic testing method can be found in the embodiment part of the magnetostrictive sensor automatic testing system mentioned above. In order to avoid redundancy, it will not be repeated here.

[0063] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0064] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0065] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0066] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. An automatic testing system for a magnetostrictive sensor, characterized in that: It includes marble working platform, product positioning fixture, laser distance measuring system, motion mechanism, electrical measuring system, product lifting mechanism and host control system; The marble work platform is used as a reference surface to provide a stable test environment for the test system; the product positioning fixture is installed on the marble work platform to fix the magnetostrictive sensor to be tested to ensure the stability of the test position; the laser distance measurement system includes a laser interferometer distance meter and a temperature compensator, which are used to measure the distance data of the magnetostrictive sensor to be tested, and send the measured distance data to the host control system for analysis; the motion mechanism is installed on the marble work platform and connected to the host control system, which is used to receive control instructions to move, carry and move the magnetic ring fixture, and realize the relative position change between the magnetostrictive sensor to be tested and the magnetic ring fixture; the electrical measurement system is connected to the host control system, which is used to collect the electrical signal data of the magnetostrictive sensor to be tested, and send the collected electrical signal data to the host control system for analysis; the product lifting mechanism includes a level lifting platform, a digital display inclinometer and a product long rod electric cylinder lifting mechanism, which are used to adjust the installation level of the product; the host control system is electrically connected to the electrical measurement system, the laser distance measurement system, the motion mechanism and the product lifting mechanism, which is used to control the operation of the laser distance measurement system, the motion mechanism, the electrical measurement system and the product lifting mechanism, analyze the test data and give a judgment result.

2. The automatic testing system for magnetostrictive sensors according to claim 1, characterized in that: The product positioning fixture is designed as a V-shaped quick positioning structure, which is suitable for magnetostrictive sensors of different shapes.

3. The automatic testing system for magnetostrictive sensors according to claim 1, characterized in that: The temperature compensator in the laser ranging system is used to sense the actual temperature of the environment and feed back the temperature change to the laser interferometer rangefinder through the compensation coefficient to ensure the accuracy of the measurement result.

4. The automatic testing system for magnetostrictive sensors according to claim 1, characterized in that: The motion mechanism realizes movement through a linear motor module mechanism, and monitors and feeds back position information in real time through a grating encoder, ensuring that the static jitter range is within the error range of the laser interferometer rangefinder.

5. The magnetostrictive sensor automatic testing system according to claim 1, characterized in that: The electrical testing system comprises a power supply and a sensor electrical signal testing instrument, wherein the sensor electrical signal testing instrument is used to collect electrical signal data of the magnetostrictive sensor to be tested.

6. The magnetostrictive sensor automatic testing system according to claim 1, characterized in that: The product long rod electric cylinder lifting mechanism in the product lifting mechanism controls the product positioning fixture to lift the height of the product long rod through multiple electric cylinders, eliminates the deflection deformation of the product long rod, and cooperates with the digital inclinometer to confirm that the product installation is parallel to the motion mechanism.

7. The automatic testing system for magnetostrictive sensors according to claim 1, characterized in that: The host control system is used to control the operation of the laser ranging system, motion mechanism, electrical measurement system and product lifting mechanism, analyze the test data and give the judgment results, specifically including: The host control system communicates with the electric measurement system through electrical connection to control the start, stop and data collection of the electric measurement system; the host control system establishes communication with the laser ranging system to control the start, stop and ranging operation of the laser interferometer rangefinder, and receives real-time temperature data sent by the temperature compensator to perform temperature compensation on the ranging data of the laser interferometer rangefinder; the host control system realizes the precise movement of the magnetic ring fixture by controlling the motion mechanism; the host control system receives and analyzes the data of the electric measurement system and the laser ranging system, makes a conformity judgment, and gives a judgment result.

8. The automatic testing system for magnetostrictive sensors according to claim 1, characterized in that: The host control system is also used to provide a user interface, allowing the user to set test parameters, including test speed, test distance, and test times; During the test, the test data and progress are displayed in real time through the user interface; After the test is completed, a detailed test report is generated, including test data, judgment results and suggestions.

9. A magnetostrictive sensor automatic testing method, characterized in that: The method adopts the magnetostrictive sensor automatic testing system according to any one of claims 1 to 8, and specifically comprises: The operator installs the magnetostrictive sensor to be tested on the product positioning fixture to ensure that the position of the magnetostrictive sensor to be tested is stable; Select the model of the magnetostrictive sensor to be tested on the test software of the host control system, enter the serial number of the magnetostrictive sensor to be tested, click the Start Test button to start the test process, and the data of the grating encoder and the laser interferometer rangefinder will be reset to zero; The host control system controls the motion mechanism through the linear motor module mechanism to start moving, driving the magnetic ring fixture to move relative to the magnetostrictive sensor to be tested. The magnetic ring fixture controls the precise movement of the linear motor module mechanism through the grating encoder according to the program setting; The electrical measurement system collects the electrical signal data of the magnetostrictive sensor to be tested in real time and sends it to the host control system. At the same time, the laser distance measurement system synchronously measures the actual distance data between the magnetostrictive sensor to be tested and the magnetic ring fixture; The motion mechanism stops moving and then starts to retreat, driving the magnetic ring fixture back to the zero position; During the retraction process, the laser interferometer continuously measures the distance data, and the host control system determines the conformity between the measured distance value fed back by the laser interferometer and the distance value calibrated by the electrical signal; based on the determination result, the host control system determines whether the magnetostrictive sensor to be tested is qualified and gives corresponding prompts; The host control system saves the test data according to the product serial number. The data includes composite judgment data and charts of electrical signal data, encoder feedback distance, and laser interferometer distance feedback distance, and automatically generates a test report. The operator removes the magnetostrictive sensor to be tested from the product positioning fixture and places it into the corresponding material box according to the prompt of the host control system.

10. The automatic testing method for magnetostrictive sensor according to claim 9, characterized in that: During the movement of the motion mechanism, when the program determines that the magnetic ring fixture is close to the electric cylinder, the corresponding electric cylinder will be lowered. After the magnetic ring fixture passes, the electric cylinder will rise again to support the product long rod to ensure the continuity and accuracy of the test.

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