Ejector rod type displacement sensor calibration device and measurement method

Abstract

The invention relates to the technical field of ejector rod type displacement sensor calibration testing, in particular to an ejector rod type displacement sensor calibration device and a measuring method. The device comprises a measured ejector rod displacement sensor, a displacement sensor calibration device and a length measuring machine. The measured ejector rod displacement sensor is connected to the displacement sensor calibration device, the displacement sensor calibration device is connected to the upper surface of the length measuring machine, and the length measuring machine drives the displacement sensor calibration device to move to measure and calibrate the measured ejector rod displacement sensor. According to the measuring range bearing range of the ejector rod displacement sensor to be measured, the calibration requirements of sensors of different specifications can be met; the small-angle pitching and horizontal small-angle adjusting functions are achieved, and the accuracy of the installation angle of the sensor is ensured; according to the invention, tool calibration and measurement data acquisition and processing are integrated, so that the stability of the device is improved, and the calibration reliability is improved; and the data acquisition accuracy of the detected ejector rod displacement sensor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of calibration and testing of a mandrel type displacement sensor, and in particular to a mandrel type displacement sensor calibration device and a measuring method. Background Art

[0002] The push rod displacement sensor has a built-in cantilever beam structure with an elastic and recoverable metal rod, which is used to measure the displacement change of the structure. The cantilever beam is made of highly elastic material, with a high-precision strain gauge inside. It adopts a strain full bridge bridge assembly method, which can self-compensate for temperature, has stable signal output, and has strong anti-interference ability. The advantages of this series of sensors are good repeatability, light weight, easy installation and use, durability, high reliability, and are widely used by scientific research units, enterprises, aerospace fields, and universities. It can be used in various engineering displacement tests to measure the static displacement or dynamic displacement of the structure. In the aerospace field, push rod displacement sensors are usually used to measure the position, displacement and deformation of aircraft, rockets and other aviation devices. Specific applications include but are not limited to: 1. Flight control system: push rod displacement sensors can be used to measure the position and displacement of aircraft control surfaces to ensure accurate control and stability of flight devices. 2. Engine monitoring: push rod displacement sensors can be used to measure the position and displacement of engine parts to monitor the operating status and performance of the engine. 3. Landing gear system: push rod displacement sensors can be used to measure the position and displacement of aircraft landing gear to ensure the normal operation and safety of the landing gear. 4. Aviation device testing: The mandrel displacement sensor can be used for the testing and verification of aviation devices, such as flight simulators, flight test benches, etc. In general, the mandrel displacement sensor can be used to monitor the position and displacement of various key components in the engine monitoring in the aerospace field, helping to monitor the operating status and performance of the tested object in real time, and ensuring the safety and stability of the tested object. These monitoring data can be used for fault diagnosis, preventive maintenance and performance optimization, and improve the reliability and efficiency of the tested object.

[0003] In the field of displacement measurement, it is crucial to accurately measure the performance of ejector-type displacement sensors. However, existing measuring devices have problems such as low precision, complex operation, and difficulty in ensuring a smooth measurement process. For example, the positioning and fixation of the sensor during the calibration process are not accurate enough, which can easily lead to measurement errors; the data acquisition and processing functions are not perfect, making it difficult to comprehensively and accurately evaluate the performance, accuracy, and reliability of the sensor; there is a lack of adaptive adjustment functions for sensors in different ranges and working environments. These problems limit the accuracy and efficiency of displacement sensor calibration, and thus affect the production and R&D quality in related fields. Taking all of the above into consideration, a simple and reliable ejector-type displacement sensor calibration device and method has become a new method for measuring and calibrating ejector-type displacement sensors. Summary of the invention

[0004] The present invention provides a calibration device for a mandrel type displacement sensor, which integrates test fixtures, measurement data collection and processing. When calibrating the displacement sensor, the calibration device can ensure that the displacement sensor is positioned and fixed on the calibration device according to the required calibration state, collect the real-time measurement data of the telescopic distance of the mandrel of the displacement sensor and signal feedback, analyze and process the collected data, compare it with the design task book, and evaluate the performance, accuracy, reliability, etc. of the displacement sensor.

[0005] To achieve the above object, the technical solution adopted by the present invention is: A measuring device for a mandrel type displacement sensor comprises a mandrel displacement sensor to be measured, a displacement sensor calibration device and a length measuring machine; the mandrel displacement sensor to be measured is connected to the displacement sensor calibration device, the displacement sensor calibration device is connected to the upper surface of the length measuring machine, and the length measuring machine drives the displacement sensor calibration device to move to measure and calibrate the mandrel displacement sensor to be measured.

[0006] The length measuring machine at least includes a high-precision new grating measurement system, and also includes a grating scale slider head, a grating scale slider, a length measuring machine slide rail and a length measuring machine installation platform; the displacement sensor calibration device is installed on the upper surface of the length measuring machine installation platform, the length measuring machine slide rail is connected to one end of the bottom of the length measuring machine installation platform, the grating scale slider is slidably connected to the length measuring machine slide rail, a grating scale head is horizontally arranged on the upper part of one side of the grating scale slider near the displacement sensor calibration device, the grating scale slider drives the grating scale head to slide, and pushes the displacement sensor calibration device to move, and the grating measurement system calibrates the displacement sensor performance of the measuring rod by analyzing the movement data of the grating scale slider.

[0007] The displacement sensor calibration device includes a spring assembly, a box-type platform assembly and a sensor fixing assembly; the sensor fixing assembly is bolted to the center of the upper surface of the box-type platform assembly, the spring assembly is horizontally connected inside the box-type platform assembly, and one end of the spring assembly extends outside the box-type platform assembly and faces the length measuring machine.

[0008] The box-type platform assembly is a rectangular box-type structure formed by upper and lower panels, left and right side panels, and front and rear end panels. A positioning groove is provided on the lower surface of the lower panel, and the box-type platform assembly is connected to the length measuring machine through the positioning groove; a hole is opened in the center of the left and right side panels of the box-type platform assembly, and the spring assembly passes through the hole and is connected to the box-type platform assembly.

[0009] The spring assembly comprises a spring top plate, a spring, a pull rod, a linear bearing and a push rod; The pull rod is composed of a first pull rod with a small diameter section on the left and a second pull rod with a large diameter section on the right to form an integrated structure. The pull rod passes through the openings on the left and right side panels of the box-type platform assembly. Linear bearings cooperating with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly. Under normal conditions, the first pull rod with a small diameter section on the left passes through the opening on the left panel and is connected to the inside of the box-type platform assembly, and the spring is sleeved on the first pull rod. The left side of the second pull rod is sleeved in the linear bearing in the opening on the right side panel of the box-type platform assembly, and the right end is vertically connected to the top plate, and the upper part of the top plate is connected to the top rod.

[0010] The sensor fixing assembly includes a pitch deflection device and a self-centering vise. The pitch deflection device is installed at the center axis position of the upper surface of the box-type platform assembly, and the self-centering vise device is installed at the center axis position of the pitch deflection device.

[0011] The displacement sensor of the mandrel to be measured is connected to the center position of the self-centering vise. During calibration, the angle of the pitch and deflection device can be adjusted to ensure that the central axis of the displacement sensor of the mandrel to be measured is parallel to the central axis of the length measuring machine and the box-type platform assembly and is level.

[0012] The length measuring machine at least includes a high-precision new type grating measurement system, and also includes a grating ruler slider head, a grating ruler slider, a length measuring machine slide rail and a length measuring machine installation platform; the displacement sensor calibration device is installed on the upper surface of the length measuring machine installation platform, the length measuring machine slide rail is connected to one end of the bottom of the length measuring machine installation platform, the grating ruler slider is slidably connected to the length measuring machine slide rail, a grating ruler head is horizontally arranged on the upper part of one side of the grating ruler slider near the displacement sensor calibration device, the grating ruler slider drives the grating ruler head to slide, and pushes the displacement sensor calibration device to move, and the grating measurement system analyzes the movement data of the grating ruler slider The performance of the displacement sensor of the top rod is calibrated; the displacement sensor calibration device includes a spring assembly, a box-type platform assembly and a sensor fixing assembly; the sensor fixing assembly is bolted to the center of the upper surface of the box-type platform assembly, the spring assembly is horizontally connected to the box-type platform assembly, and one end of the spring assembly extends to the outside of the box-type platform assembly, facing the length measuring machine; the box-type platform assembly is a rectangular box structure surrounded by upper and lower panels, left and right side panels and front and rear end panels, the lower surface of the lower panel is provided with a positioning groove, and the box-type platform assembly is connected to the length measuring machine through the positioning groove; the left and right side panels of the box-type platform assembly are centrally opened The spring assembly passes through the opening and is connected to the box-type platform assembly; the spring assembly includes a spring top plate, a spring, a pull rod, a linear bearing and a push rod; the pull rod is composed of a first pull rod with a small diameter section on the left and a second pull rod with a large diameter section on the right to form an integrated structure, the pull rod passes through the openings on the left and right sides of the box-type platform assembly, and linear bearings that cooperate with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly; in a normal state, the first pull rod with a small diameter section on the left passes through the opening on the left panel and is connected to the inside of the box-type platform assembly, and the spring is fitted on the first pull rod; the second pull rod on the left The side is sleeved in the linear bearing of the opening on the right side panel of the box-type platform assembly, and the right end is vertically connected to the top plate, and the upper part of the top plate is connected to the top rod; the sensor fixing assembly includes a pitch deflection device and a self-centering vise, the pitch deflection device is installed on the central axis position of the upper surface of the box-type platform assembly, and the self-centering vise device is installed on the central axis position of the pitch deflection device; the measured top rod displacement sensor is connected to the center position of the self-centering vise, and the angle of the pitch deflection device can be adjusted during calibration to ensure that the central axis of the measured top rod displacement sensor is parallel to the central axis of the length measuring machine and the box-type platform assembly and is kept horizontal.

[0013] A measuring method for a plunger type displacement sensor calibration device comprises the following steps: Step 1: Perform static calibration. Verify and calibrate the accuracy of the calibration device of the ejector displacement sensor before formal calibration. Observe whether the spring assembly is deformed or damaged. Verify the accuracy of the grating measuring device of the length measuring machine and the displacement stroke of the spring assembly. Check the integrity of the calibration device. Prepare for calibration according to the calibration procedure. Step 2: Pre-calibration step, select the displacement sensor of the measured push rod, and correctly install it on the displacement sensor fixing assembly of the calibration device. The displacement sensor of the measured push rod is parallel to the axis of the length measuring machine and fixed horizontally; turn on the grating measurement system of the length measuring machine, the grating ruler slider slides to the left, the top of the grating ruler slider contacts the push rod, and the force is transmitted to the top plate through the push rod. The top plate transmits the force to the second pull rod, and the second pull rod slides to the left and compresses the spring at the same time. When the top plate contacts the displacement sensor push rod, the working stroke distance of the measured push rod displacement sensor is moved to the left by the grating ruler slider to measure and calibrate the measured push rod displacement sensor; Step three: Formal calibration step, select the measured push rod displacement sensor, and correctly install it on the displacement sensor fixing component of the calibration device, so that the measured push rod displacement sensor and the length measuring machine keep the axis parallel and fixed horizontally. The length measuring machine grating scale slider pushes the spring assembly to cycle back and forth 3 times according to the maximum displacement stroke of the measured push rod displacement sensor, and observe whether the displacement stroke of the measured push rod displacement sensor can return to the zero point. If the displacement is normal, divide the maximum stroke of the measured push rod displacement sensor 4 into 5 stage strokes, and the length measuring machine performs stroke detection according to the 5 stage strokes. One cycle is from the maximum stroke section → the minimum stroke section → the maximum stroke section. A total of three cycles are used to complete the calibration. After the calibration is completed, the performance of the measured push rod displacement sensor 4 is analyzed and evaluated through the obtained data.

[0014] Beneficial effects: 1. The present invention can adapt to the calibration requirements of sensors of different specifications according to the measuring range of the measured mandrel displacement sensor.

[0015] 2. The present invention has the function of adjusting the measured top rod displacement sensor at a small pitch angle and a small horizontal angle, thereby ensuring the accuracy of the sensor installation angle, improving the stability of the device, and increasing the reliability of calibration.

[0016] 3. The present invention is simple to operate for fixing the displacement sensor of the mandrel to be measured. When the displacement sensor of the mandrel to be measured is installed and fixed, it is parallel to the axis of the device and the length measuring machine and remains horizontal, thereby reducing the measurement error caused by installation deviation.

[0017] 4. The present invention integrates calibration tooling, measurement data collection and processing, collects real-time data of the measured mandrel displacement sensor, analyzes and processes the collected data in a timely manner, compares it with the design task book, evaluates the performance, accuracy, reliability, etc. of the displacement sensor, and improves the accuracy of data collection of the measured mandrel displacement sensor.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front view of the present invention; Figure 2 is a top view of the present invention; Figure 3 The acquisition software functional interface of the present invention Figure 1 ; Figure 4 The acquisition software functional interface of the present invention Figure 2 .

[0021] In the figure: 1. first tie rod; 2. spring; 3. box-type platform assembly; 4. displacement sensor of the measured push rod; 5. self-centering vise; 6. pitch and deflection device; 7. linear bearing; 8. push rod of displacement sensor; 9. second tie rod; 10. push plate; 11. push rod; 12. top of grating ruler slider; 13. grating ruler slider; 14. slide rail of length measuring machine; 15. installation platform of length measuring machine. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0023] Example: Figure 1 It is a front view of the present invention, showing the relative positions and connection relationship of the spring assembly, the box-type platform assembly 3, the displacement sensor of the measured mandrel 4, the sensor fixing assembly, the length measuring machine and other components; Figure 2 is a top view of the present invention, further illustrating the layout of various components in the horizontal direction; Figure 3 , Figure 4 It is a functional interface diagram of the acquisition software of the present invention, which intuitively presents the various functional modules and operation interface of the software.

[0024] according to Figure 1-Figure 4The shown device is a mandrel type displacement sensor measuring device, comprising a mandrel displacement sensor 4 to be measured, a displacement sensor calibration device and a length measuring machine; the mandrel displacement sensor 4 to be measured is connected to the displacement sensor calibration device, the displacement sensor calibration device is connected to the upper surface of the length measuring machine, and the length measuring machine drives the displacement sensor calibration device to move to measure and calibrate the mandrel displacement sensor 4 to be measured.

[0025] Furthermore, the length measuring machine at least includes a high-precision new type grating measurement system, and the length measuring machine also includes a grating scale slider head 12, a grating scale slider 13, a length measuring machine slide rail 14 and a length measuring machine installation platform 15; the displacement sensor calibration device is installed on the upper surface of the length measuring machine installation platform 15, the length measuring machine slide rail 14 is connected to one end of the bottom of the length measuring machine installation platform 15, the grating scale slider 13 is slidably connected to the length measuring machine slide rail 14, and a grating scale head 12 is horizontally arranged on the upper part of one side of the grating scale slider 13 near the displacement sensor calibration device. The grating scale slider 13 drives the grating scale head 12 to slide, and pushes the displacement sensor calibration device to move. The grating measurement system calibrates the performance of the measuring top rod displacement sensor 4 by analyzing the movement data of the grating scale slider 13.

[0026] Further, such as Figure 1 and Figure 2 As shown, the displacement sensor calibration device includes a spring assembly, a box-type platform assembly 3 and a sensor fixing assembly; the sensor fixing assembly is bolted to the center of the upper surface of the box-type platform assembly 3, the spring assembly is horizontally connected inside the box-type platform assembly 3, and one end thereof extends outside the box-type platform assembly 3, facing the length measuring machine.

[0027] Furthermore, the box-type platform assembly 3 is a rectangular box-type structure formed by upper and lower panels, left and right side panels, and front and rear end panels. A positioning groove is provided on the lower surface of the lower panel, and the box-type platform assembly 3 is connected to the length measuring machine through the positioning groove; a hole is opened in the center of the left and right side panels of the box-type platform assembly 3, and the spring assembly passes through the opening to be connected to the box-type platform assembly 3. The box-type platform assembly is a profile aluminum plate processing assembly. The upper and lower parallel panels are processed with positioning grooves and threaded holes for installing and fixing the box-type platform assembly 3, the spring assembly and the sensor fixing assembly, which is convenient for the overall stability of the calibration device and ensures the horizontal installation of the measured top rod displacement sensor 4. The box-type platform assembly 3 is installed on the length measuring machine installation platform 15 to ensure the stability and fixed use of the calibration device; the positioning grooves and mounting holes on the lower panel of the box-type platform assembly 3 are connected and fixed to the T-shaped bottom plate of the length measuring machine installation platform 15, and the upper surface is fixed with bolts to fix the sensor fixing assembly. The interior of the box-type platform assembly 3 is used to install and fix the spring assembly, so that the spring assembly is installed and fixed in place, ensuring that the spring assembly can be extended and retracted smoothly without jamming. Further, the spring assembly is a standard component and a profile aluminum component processed and assembled component, and the spring assembly includes a spring top plate 10, a spring 2, a pull rod, a linear bearing 7 and a push rod 11; The pull rod is composed of a first pull rod 1 of a small diameter section on the left and a second pull rod 9 of a large diameter section on the right, which is an integrated structure. The pull rod passes through the openings of the left and right panels of the box-type platform assembly 3. Linear bearings 7 cooperating with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly; in a normal state, the first pull rod 1 of the small diameter section on the left passes through the opening on the left side and is connected to the inside of the box-type platform assembly 2, and the spring 2 is fitted on the first pull rod 1; the left side of the second pull rod 9 is fitted in the linear bearing 7 of the opening on the right side of the box-type platform assembly 3, and the right end is vertically connected to a top plate 10, and a top rod 11 is connected to the top of the top plate 10. The spring 2 is a custom-made SU304 part, which is processed according to the elastic force and telescopic length. The installation position of the spring top plate 10 is adjusted according to the telescopic length of the top rod of the measured top rod displacement sensor, to ensure that the spring assembly is smooth, smooth and without jamming during use, and does not affect the rebound force of the top rod of the measured top rod displacement sensor 4.

[0028] Furthermore, the sensor fixing assembly is a customized assembly, and the sensor fixing assembly includes a pitch deflection device 6 and a self-centering vise 5. The pitch deflection device 6 is installed at the center axis position of the upper surface of the box-type platform assembly, and the self-centering vise 5 is installed at the center axis position of the pitch deflection device 6.

[0029] The displacement sensor 4 of the mandrel to be measured is connected to the center position of the self-centering vise 5. The angle of the pitch deflection device 6 can be adjusted during calibration to ensure that the central axis of the displacement sensor 4 of the mandrel to be measured is parallel to the central axis of the length measuring machine and the box-type platform assembly and is level.

[0030] The length measuring machine at least includes a high-precision new type grating measurement system, and also includes a grating ruler slider head 12, a grating ruler slider 13, a length measuring machine slide rail 14 and a length measuring machine installation platform 15; the displacement sensor calibration device is installed on the upper surface of the length measuring machine installation platform 15, the length measuring machine slide rail 14 is connected to one end of the bottom of the length measuring machine installation platform 15, the grating ruler slider 13 is slidably connected to the length measuring machine slide rail 14, and a grating ruler slider 13 is horizontally arranged on the upper part of one side of the grating ruler slider 13 near the displacement sensor calibration device. The grating ruler slider 13 drives the grating ruler head 12 to slide, and pushes the displacement sensor calibration device to move. The grating measurement system is divided into The performance of the displacement sensor 4 of the measuring rod is calibrated by analyzing the moving data of the grating ruler slider 13; the displacement sensor calibration device includes a spring assembly, a box-type platform assembly 3 and a sensor fixing assembly; the sensor fixing assembly is bolted to the center of the upper surface of the box-type platform assembly 3, the spring assembly is horizontally connected to the box-type platform assembly 3, and one end thereof extends to the outside of the box-type platform assembly 3, facing the length measuring machine; the box-type platform assembly 3 is surrounded by upper and lower panels, left and right side panels and front and rear end panels to form a rectangular box structure, the lower surface of the lower panel is provided with a positioning groove, and the box-type platform assembly 3 is connected to the length measuring machine through the positioning groove; the left and right side panels of the box-type platform assembly 3 are centrally located The spring assembly passes through the opening and is connected to the box-type platform assembly 3; the spring assembly includes a spring top plate 10, a spring 2, a pull rod, a linear bearing 7 and a top rod 11; the pull rod is composed of a first pull rod 1 with a small diameter section on the left and a second pull rod 9 with a large diameter section on the right to form an integrated structure, and the pull rod passes through the openings on the left and right side panels of the box-type platform assembly 3, and linear bearings 7 cooperating with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly; in a normal state, the first pull rod 1 with a small diameter section on the left passes through the opening on the left side and is connected to the inside of the box-type platform assembly 2, and the spring 2 is fitted on the first pull rod 1; the second pull rod 9 The left side is sleeved in the linear bearing 7 with a hole on the right side of the box-type platform assembly 3, and the right end is vertically connected to the top plate 10, and the top plate 10 is connected to the top rod 11; the sensor fixing assembly includes a pitch deflection device 6 and a self-centering vise 5, the pitch deflection device 6 is installed at the central axis position of the upper surface of the box-type platform assembly, and the self-centering vise 5 is installed at the central axis position of the pitch deflection device 6; the measured push rod displacement sensor 4 is connected to the center position of the self-centering vise 5, and the angle of the pitch deflection device 6 can be adjusted during calibration to ensure that the central axis of the measured push rod displacement sensor 4 is parallel to the central axis of the length measuring machine and the box-type platform assembly and is level.

[0031] A measuring method for a plunger type displacement sensor calibration device comprises the following steps: Step 1: Perform static calibration. Verify and calibrate the accuracy of the calibration device of the ejector displacement sensor before formal calibration. Observe whether the spring assembly is deformed or damaged. Verify the accuracy of the grating measuring device of the length measuring machine and the displacement stroke of the spring assembly. Check the integrity of the calibration device. Prepare for calibration according to the calibration procedure. Step 2: Pre-calibration step, select the displacement sensor 4 of the measured push rod, and correctly install it on the displacement sensor fixing assembly of the calibration device. The displacement sensor 4 of the measured push rod is parallel to the axis of the length measuring machine and fixed horizontally; turn on the grating measurement system of the length measuring machine, the grating ruler slider 13 slides to the left, the grating ruler slider head 12 contacts the push rod 11, and the force is transmitted to the top plate 10 through the push rod 11. The top plate 10 transmits the force to the second pull rod 9, and the second pull rod 9 slides to the left and compresses the spring 2 at the same time. When the top plate 10 contacts the displacement sensor push rod 8, the working stroke distance of the measured push rod displacement sensor 4 is moved to the left by the grating ruler slider 13 to measure and calibrate the measured push rod displacement sensor 4; Step three: Formal calibration step, select the measured push rod displacement sensor 4, and correctly install it on the displacement sensor fixing component of the calibration device, so that the measured push rod displacement sensor 4 keeps the axis parallel to the length measuring machine and is fixed horizontally. The length measuring machine grating scale slider 13 pushes the spring assembly to cycle back and forth 3 times according to the maximum displacement stroke of the measured push rod displacement sensor 4, and observe whether the displacement stroke of the measured push rod displacement sensor can return to the zero point. If the displacement is normal, the maximum stroke of the measured push rod displacement sensor 4 is divided into 5 stage strokes, and the length measuring machine performs stroke detection according to the 5 stage strokes. From the maximum stroke section → the minimum stroke short → the maximum stroke section is one cycle, and the calibration is completed in three cycles. After the calibration is completed, the performance of the measured push rod displacement sensor 4 is analyzed and evaluated through the obtained data.

[0032] Further, such as Figure 3 and Figure 4As shown, the LABC-Nano fully automatic multifunctional length measuring machine adopts a high-precision new grating measurement system, which is the existing technology. The grating scale is 350 mm long and can measure absolutely within a large range. The design of labconcept nano provides an ideal execution platform for the inspection and calibration of various measuring instruments and measuring instruments. The inspection of internal and external dimensions will be carried out by three motorized axes XYZ and a fully automatic procedure using the grating measurement system. The LABC-Nano fully automatic multifunctional length measuring machine combines tradition, experience and strong technological leadership. It integrates brand-new measurement and motorization technology and can be considered the first "all-digital" calibration instrument. A common computer controls all electronic components. This low-power solution avoids heating and keeps energy, maintenance and repair costs at a reasonable level. The linear bearings used in all guides have proven their superiority over other technologies in terms of accuracy, wear, stiffness, temperature stability, reliability, dust prevention and maintenance. They ensure excellent repeatability and precision over time. The base is cast with special materials, the instrument is stable and reliable, fully automatic measurement, fast speed and high precision, and can effectively eliminate manual operation errors. Main features of length measuring machine: 1. Excellent accuracy: It can provide high-precision measurement data and ensure the accuracy of calibration results.

[0033] 2. Excellent repeatability: multiple measurement results are stable and reliable with strong repeatability; 3. Electric CNC axes X, Y and Z: convenient for automated operation and multi-dimensional measurement control; 4. Measuring force (0-12N) and software-implemented measuring anvil locking: the measuring force can be precisely controlled to ensure the stability of the measuring process; 4. Absolute measurement range 350mm: provides a wider measurement range; 5. High resolution 0.001μm: can accurately capture tiny displacement changes; 6. Measurement accuracy 0.07+[L(mm) / 2000]μm: clear measurement accuracy indicators, easy to evaluate measurement results; 7. Measuring force 0-12N continuously adjustable: adapt to the measuring force requirements of different sensors.

[0034] The length measuring machine software mainly has the following functions: 1. File operation: open / save data files, import calibration data, export data files to facilitate data management and sharing; 2. Signal setting: Set the module, channel, filter, input range and other parameters corresponding to the signal to ensure the accuracy and effectiveness of signal acquisition; 3. Signal calibration: calibrate the sensor, calculate the linearity, hysteresis, repeatability accuracy, calculate the usage accuracy, and comprehensively evaluate the sensor performance; 4. Signal monitoring: Display the selected signal curve and instantaneous value, but do not save to disk, so as to observe the sensor signal changes in real time; 5. Data collection: collect and save signal values ​​in real time, and display the selected signal curve and instantaneous value in real time to ensure the integrity and timeliness of data; 6. Curve display: The curve can be stretched horizontally to display the signal value at the corresponding moment of the mouse, which is convenient for detailed analysis of the data curve; 7. Data processing: It can process and analyze the displacement sensor signals of the extended access to improve the versatility and scalability of the device; 8. Report printing: Print calibration records, data curves, signal instantaneous values, data summary tables, etc. to facilitate the recording and reporting of results; 9. File format: Each test corresponds to a data file, including the signal parameter settings, calibration records, test data and data processing results, which is convenient for data collation and traceability.

[0035] When the length measuring machine drives the displacement sensor of the measured push rod to produce displacement changes, the signal of the measured push rod displacement sensor is fed back to the grating measurement system, and the test data is effectively analyzed and processed through the grating measurement system. The grating measurement system records the displacement change data of the push rod telescopic displacement of the measured push rod displacement sensor, and calculates the linear change value of the push rod telescopic displacement of the measured push rod displacement sensor, which increases the accuracy of the data collected by the device and has high repeatability. The calibration device integrates calibration tooling, measurement data collection and processing. When calibrating, the calibration device can ensure that the side push rod displacement sensor is positioned and fixed on the calibration device, collect the real-time calibration data of the measured push rod displacement sensor, analyze and process the collected data, compare it with the design task book, and evaluate the performance, accuracy, reliability, etc. of the displacement sensor.

[0036] Different from the above-mentioned embodiment, a measurement method of a plunger-type displacement sensor calibration device comprises the following steps: Step 1: Perform static calibration. Verify and calibrate the accuracy of the equipment itself before formal calibration. Observe whether the spring assembly is deformed or damaged. Verify the accuracy of the displacement stroke of the grating measuring device and the spring assembly of the length measuring machine. Check the integrity of the calibration device. Prepare for calibration according to the calibration procedures. Step 2: Pre-calibration step, select the displacement sensor 4 of the measured push rod, and correctly install it on the displacement sensor fixing assembly of the calibration device. The displacement sensor 4 of the measured push rod is parallel to the axis of the length measuring machine and fixed horizontally; turn on the grating measurement system of the length measuring machine, the grating ruler slider 13 slides to the left, the grating ruler slider head 12 contacts the push rod 11, and the force is transmitted to the top plate 10 through the push rod 11. The top plate 10 transmits the force to the second pull rod 9, and the second pull rod 9 slides to the left and compresses the spring at the same time. When the top plate 10 contacts the push rod 8 of the displacement sensor of the measured push rod, the working stroke distance of the displacement sensor 4 of the measured push rod is moved to the left by the grating ruler slider 13 to measure and calibrate the displacement sensor 4 of the measured push rod; Step 3: Formal calibration step, select the displacement sensor 4 of the measured push rod, and correctly install it on the displacement sensor fixing component of the calibration device, so that the displacement sensor 4 of the measured push rod is parallel to the axis of the length measuring machine and fixed horizontally. The slider 13 of the length measuring machine pushes the spring assembly from the maximum stroke section → the minimum stroke section → the maximum stroke section as a cycle, and the calibration is completed after three cycles in total. Observe whether the displacement stroke of the displacement sensor of the measured push rod can return to the zero point. If the displacement is normal, it is divided into 5 steps according to the maximum full scale of the displacement sensor of the measured push rod. The specific calibration process is as follows: The grating ruler head 12 is Move to the left, push the top plate 10, the top plate 10 starts to move to the left, when the top plate 10 starts to slightly push the displacement sensor top rod 8, the displacement sensor 4 of the measured top rod displays the zero point change in real time, the grating ruler collects the zero point and marks the coordinate position, after the zero point collection is completed, the grating ruler slider 13 continues to move to the left until the displacement sensor 4 of the measured top rod displays the full-scale maximum value, the grating ruler slider 13 stops moving to the left and collects the maximum value of the displacement sensor 4 of the measured top rod and marks the grating ruler position, according to the position mark distance from the zero point to the maximum value marked by the grating ruler, the distance of the collection mark is divided into 5 by the grating ruler system The equal-division stroke is: zero point, the first equal-division step value, the second equal-division step value, the third equal-division step value, the fourth equal-division step value, and the fifth equal-division step value; after completing the equal-division stroke distance position, the grating ruler slider 13 moves leftward to the zero point position for collection. After the collection is completed, it starts to move leftward by an equal-division distance to collect the first step value and coordinate position, and so on, until the fifth equal-division step value (the last equal-division step value) and the marked coordinate position are collected, and then the grating ruler slider 13 is moved rightward, and the top plate 10 moves rightward through the rebound of the spring 2, and the displacement sensor 4 of the measured top rod rebounds by itself (the top rod of some models When the displacement sensor push rod has no rebound function, replace the spring assembly top plate. The new push plate is connected with the opening according to the style of the sensor push rod head to ensure that the push rod and the top plate are connected as a whole. When the top plate moves left or right, the push rod moves together); when the grating ruler slider 13 returns to the fourth step value, the coordinate position is collected, and the return value of the measured push rod displacement sensor 4 is collected, and so on until the grating ruler slider 13 returns to the coordinate position where the zero point is started to be collected; in this way, the collection starts from the zero point until the fifth equally divided step value is collected, and then returns to collect to the zero point in sequence, which is a cycle calibration. Three cycle calibrations are required to calibrate one sensor. The linearity, hysteresis, repeatability and accuracy of the measured push rod displacement sensor 4 are calculated according to the formula through the step value collected by the grating ruler to determine whether the sensor meets the use requirements.

[0037] The present invention needs to perform static calibration before formal calibration to verify and calibrate the accuracy of the equipment itself. During static calibration, observe whether the spring assembly is deformed or damaged, whether the displacement stroke of the length measuring machine grating scale slider 13 and the spring assembly is accurate, and whether the calibration device is intact. Perform pre-calibration inspection and preparation according to the calibration procedures. The displacement sensor 4 of the measured push rod is calibrated to meet the requirements of the regulations. After the calibration is completed, the data obtained by the grating measurement system is analyzed and calculated to obtain the accuracy of the displacement sensor 4 of the measured push rod. In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0038] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0040] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A mandrel type displacement sensor measuring device, characterized in that: It comprises a displacement sensor (4) for a mandrel to be measured, a displacement sensor calibration device and a length measuring machine; the displacement sensor (4) for a mandrel to be measured is connected to the displacement sensor calibration device, the displacement sensor calibration device is connected to the upper surface of the length measuring machine, and the length measuring machine drives the displacement sensor calibration device to move, thereby measuring and calibrating the displacement sensor (4) for a mandrel to be measured.

2. The device for calibrating a mandrel-type displacement sensor according to claim 1, characterized in that: The length measuring machine at least comprises a high-precision novel grating measurement system, and also comprises a grating ruler slider head (12), a grating ruler slider (13), a length measuring machine slide rail (14) and a length measuring machine mounting platform (15); the displacement sensor calibration device is mounted on the upper surface of the length measuring machine mounting platform (15); the length measuring machine slide rail (14) is connected to one end of the bottom of the length measuring machine mounting platform (15); the grating ruler slider (13) is slidably connected to the length measuring machine slide rail (14); a grating ruler head (12) is horizontally arranged on the upper part of one side of the grating ruler slider (13) near the displacement sensor calibration device; the grating ruler slider (13) drives the grating ruler head (12) to slide, thereby pushing the displacement sensor calibration device to move; the grating measurement system calibrates the performance of the measuring rod displacement sensor (4) by analyzing the movement data of the grating ruler slider (13).

3. The device for calibrating a mandrel-type displacement sensor according to claim 1, characterized in that: The displacement sensor calibration device comprises a spring assembly, a box-type platform assembly (3) and a sensor fixing assembly; the sensor fixing assembly is bolted to a central position on the upper surface of the box-type platform assembly (3); the spring assembly is horizontally connected inside the box-type platform assembly (3), and one end of the spring assembly extends outside the box-type platform assembly (3) and faces the length measuring machine.

4. The device for calibrating a mandrel-type displacement sensor according to claim 3, characterized in that: The box-type platform component (3) is a rectangular box-type structure formed by upper and lower panels, left and right side panels, and front and rear end panels. A positioning groove is provided on the lower surface of the lower panel, and the box-type platform component (3) is connected to the length measuring machine via the positioning groove. A hole is opened at the center of the left and right side panels of the box-type platform component (3), and the spring component passes through the hole and is connected to the box-type platform component (3).

5. The device for calibrating a mandrel-type displacement sensor according to claim 4, characterized in that: The spring assembly comprises a spring top plate (10), a spring (2), a pull rod, a linear bearing (7) and a push rod (11); The pull rod is composed of a first pull rod (1) of a left side small diameter section and a second pull rod (9) of a right side large diameter section to form an integrated structure. The pull rod passes through openings on the left and right side panels of the box-type platform assembly (3). Linear bearings (7) cooperating with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly. Under normal conditions, the first pull rod (1) of the left side small diameter section passes through the opening of the left side panel and is connected to the inside of the box-type platform assembly (2), and the spring (2) is fitted on the first pull rod (1); the left side of the second pull rod (9) is fitted in the linear bearing (7) of the opening of the right side panel of the box-type platform assembly (3), and the right end is vertically connected to the top plate (10), and the top of the top plate (10) is connected to the top rod (11).

6. The device for calibrating a mandrel-type displacement sensor according to claim 3, characterized in that: The sensor fixing assembly comprises a pitch deflection device (6) and a self-centering vise (5); the pitch deflection device (6) is mounted at the center axis position of the upper surface of the box-type platform assembly; and the self-centering vise (5) is mounted at the center axis position of the pitch deflection device (6).

7. The device for calibrating a mandrel-type displacement sensor according to claim 6, characterized in that: The measured mandrel displacement sensor (4) is connected to the center position of the self-centering vise (5), and the angle of the pitch deflection device (6) can be adjusted during calibration to ensure that the center axis of the measured mandrel displacement sensor (4) is parallel to the center axis of the length measuring machine and the box-type platform assembly and is level.

8. The device for calibrating a mandrel-type displacement sensor according to claim 1, characterized in that: The length measuring machine comprises at least a high-precision novel grating measurement system, and also comprises a grating ruler slider head (12), a grating ruler slider (13), a length measuring machine slide rail (14) and a length measuring machine mounting platform (15); the displacement sensor calibration device is mounted on the upper surface of the length measuring machine mounting platform (15); the length measuring machine slide rail (14) is connected to one end of the bottom of the length measuring machine mounting platform (15); the grating ruler slider (13) is slidably connected to the length measuring machine slide rail (14); a grating ruler head (12) is horizontally arranged on the upper part of one side of the grating ruler slider (13) near the displacement sensor calibration device; the grating ruler slider (13) drives the grating ruler head (12) to slide, thereby pushing the displacement sensor calibration device to move; the grating measurement system is divided into The performance of the displacement sensor (4) of the measuring rod is calibrated by analyzing the movement data of the grating ruler slider (13); the displacement sensor calibration device comprises a spring assembly, a box-type platform assembly (3) and a sensor fixing assembly; the sensor fixing assembly is bolted to the center of the upper surface of the box-type platform assembly (3); the spring assembly is horizontally connected to the box-type platform assembly (3), and one end of the spring assembly extends to the outside of the box-type platform assembly (3) and faces the length measuring machine; the box-type platform assembly (3) is surrounded by upper and lower panels, left and right side panels and front and rear end panels to form a rectangular box structure; the lower surface of the lower panel is provided with a positioning groove, and the box-type platform assembly (3) is connected to the length measuring machine through the positioning groove; the left and right side panels of the box-type platform assembly (3) have a central opening, and the spring assembly The spring assembly passes through the opening and is connected to the box-type platform assembly (3); the spring assembly includes a spring top plate (10), a spring (2), a pull rod, a linear bearing (7) and a top rod (11); the pull rod is composed of a first pull rod (1) with a small diameter section on the left and a second pull rod (9) with a large diameter section on the right to form an integrated structure, and the pull rod passes through the openings on the left and right side panels of the box-type platform assembly (3), and linear bearings (7) cooperating with the pull rod are arranged in the left and right openings to ensure that the pull rod slides smoothly and without jamming in the box-type platform assembly; in a normal state, the first pull rod (1) with a small diameter section on the left passes through the opening on the left side and is connected to the inside of the box-type platform assembly (2), and the spring (2) is fitted on the first pull rod (1); the second pull rod (9) is fitted on the left side In the linear bearing (7) of the right side panel opening of the box-type platform assembly (3), a top plate (10) is vertically connected to the right end, and a top rod (11) is connected to the top plate (10); the sensor fixing assembly comprises a pitch deflection device (6) and a self-centering vise (5), the pitch deflection device (6) is installed at the center axis position of the upper surface of the box-type platform assembly, and the self-centering vise (5) is installed at the center axis position of the pitch deflection device (6); the measured top rod displacement sensor (4) is connected to the center position of the self-centering vise (5), and the angle of the pitch deflection device (6) can be adjusted during calibration to ensure that the center axis of the measured top rod displacement sensor (4) is parallel to the center axis of the length measuring machine and the box-type platform assembly and is horizontal.

9. A measurement method using a plunger type displacement sensor calibration device as claimed in claim 8, characterized in that: The following steps are involved: Step 1: Perform static calibration. Verify and calibrate the accuracy of the calibration device of the ejector displacement sensor before formal calibration. Observe whether the spring assembly is deformed or damaged. Verify the accuracy of the grating measuring device of the length measuring machine and the displacement stroke of the spring assembly. Check the integrity of the calibration device. Prepare for calibration according to the calibration procedure. Step 2: pre-calibration; select the displacement sensor (4) to be measured and correctly install it on the displacement sensor fixing assembly of the calibration device, the displacement sensor (4) to be measured is kept parallel to the axis of the length measuring machine and fixed horizontally; turn on the grating measurement system of the length measuring machine, the grating ruler slider (13) slides to the left, the grating ruler slider head (12) contacts the push rod (11), the force is transmitted to the top plate (10) through the push rod (11), the top plate (10) transmits the force to the second pull rod (9), the second pull rod (9) slides to the left and compresses the spring (2), when the top plate (10) contacts the displacement sensor push rod (8), the working stroke distance of the displacement sensor (4) to be measured is moved to the left by the grating ruler slider (13), so as to measure and calibrate the displacement sensor (4) to be measured; Step 3: Formal calibration step, select the displacement sensor (4) of the measured push rod, and correctly install it on the displacement sensor fixing component of the calibration device, so that the displacement sensor (4) of the measured push rod is parallel to the axis of the length measuring machine and fixed horizontally, and the grating slider (13) of the length measuring machine pushes the spring component to cycle back and forth three times according to the maximum displacement stroke of the measured push rod displacement sensor (4), and observe whether the displacement stroke of the measured push rod displacement sensor can return to the zero point. If the displacement is normal, the maximum stroke of the measured push rod displacement sensor (4) is divided into 5 stage strokes, and the length measuring machine performs stroke detection according to the 5 stage strokes respectively. From the maximum stroke section → the minimum stroke section → the maximum stroke section is one cycle, and the calibration is completed after three cycles. After the calibration is completed, the performance of the measured push rod displacement sensor (4) is analyzed and evaluated based on the obtained data.

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