A displacement sensor accuracy calibration tool

Abstract

The utility model discloses a displacement sensor precision calibration tool. In order to overcome the problem that the eddy current displacement sensor in the prior art is prone to errors due to the influence of the installation space and the environment, and the precision inspection is difficult, a tool for accurate calibration and redrawing of characteristic curves is needed to reduce the difficulty of work; the utility model adopts a static calibrator body with a differential cylinder ring arranged on the side, a micrometer screw is assembled with a bracket after being limited by a fixed sleeve, one end passes through and connects to the bottom end of the differential cylinder, and the other end is vertically connected to the simulated mirror plate; the bottom end of the static calibrator body is fixedly connected to the bracket; the differential cylinder drives the simulated mirror plate to move through the micrometer screw. Without removing the sensor, by accurately changing the distance between the probe and the simulated mirror plate and recording the test value of the sensor output signal, the accuracy of the sensor after installation can be quickly inspected and calibrated. It also has the function of redrawing the output signal characteristic curve of the sensor after installation.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement sensors, in particular to a displacement sensor precision calibration tool. Background Art

[0002] In modern industrial control systems, displacement sensors play a vital role, especially in situations where extremely high displacement detection accuracy is required, such as heavy-load high-speed thrust bearing test benches, precision mechanical positioning, etc. Among them, displacement sensors made using the eddy current principle have been widely used due to their high sensitivity and rapid response capabilities. The working principle of eddy current displacement sensors is based on electromagnetic induction. When relative displacement occurs between the probe and the detected object, the electromagnetic field inside the probe changes, thereby generating an electrical signal output proportional to the displacement. However, eddy current displacement sensors face space limitations during installation, and accurate installation and alignment are a major challenge. Improper installation can easily lead to displacement detection errors. In addition, the sensor output signal is easily affected by environmental factors, making accuracy verification difficult, and the output signal characteristic curve needs to be redrawn according to the actual application situation, which increases the cost and difficulty of the work.

[0003] For example, a "displacement sensor calibration instrument" disclosed in Chinese patent documents, with the announcement number CN107356188A, includes a micrometer for driving the detected part, a light rod and its mounting seat, a mounting seat of the detected part that can move freely on the light rod, a sensor mounting seat that can achieve angle positioning, and a base for positioning the above components. Compared with this solution, it is also used for calibrating the accuracy of eddy current sensors, but its structure is complex and the manufacturing cost is high. It is mainly suitable for sensor manufacturers to use for factory accuracy quality inspection of sensors, and is not convenient for the accuracy inspection of displacement sensors after installation under other complex working conditions. Summary of the invention

[0004] The utility model mainly solves the problem in the prior art that eddy current displacement sensors are prone to errors due to the influence of installation space and environment, and the accuracy inspection is difficult, and tools for accurate calibration and redrawing characteristic curves are needed to reduce the difficulty of work; it provides a displacement sensor accuracy calibration tool, which can achieve rapid inspection and calibration of the accuracy of the sensor after installation by accurately changing the distance between the probe and the analog mirror plate 3 without removing the sensor, and recording the sensor output signal test value. At the same time, the tool also has the function of redrawing the output signal characteristic curve of the sensor after installation, ensuring that the sensor can provide accurate and reliable displacement data in actual operation.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0006] The utility model includes a static calibrator body with a differential cylinder arranged in a side ring, a micrometer screw is assembled with a bracket after being limited by a fixed sleeve, one end of the micrometer screw passes through and connects to the bottom end of the differential cylinder, and the other end is vertically connected to the analog mirror plate; the bottom end of the static calibrator body is fixedly connected to the bracket; the differential cylinder drives the analog mirror plate to move through the micrometer screw. Among them, the design of the differential cylinder makes the entire static calibrator body compact, which is convenient for installation in a narrow or complex installation environment. This side layout also facilitates the operator to read and adjust the differential cylinder. Through the assembly of the micrometer screw and the bracket, the precise connection between the analog mirror plate and the differential cylinder is achieved, the installation steps are simplified, and the installation efficiency is improved. In addition, the vertical connection between the analog mirror plate and the micrometer screw ensures the linearity of the displacement, avoids the error introduced by the connection angle deviation, and further simplifies the installation and debugging process.

[0007] Furthermore, the precise scale of the differential cylinder enables the displacement of the simulated mirror plate to be accurately controlled, so that the output signal of the sensor under different displacements can be accurately recorded. By simulating the displacement of the mirror plate, the change in the oil film thickness of the thrust bearing can be simulated, and then the performance of the displacement sensor under actual working conditions can be tested. After the sensor is installed, the output signal of the sensor can be quickly calibrated by adjusting the micrometer screw and the differential cylinder to ensure that it is consistent with the theoretical value, thereby improving the accuracy of the displacement measurement. According to the actual test value, the output signal characteristic curve of the sensor after installation can be quickly and accurately redrawn, providing a reliable basis for the precise use of the sensor.

[0008] Preferably, the micrometer screw is assembled with a fixed sleeve through a differential screw, and the rotation of the differential cylinder drives the micrometer screw to move in the fixed sleeve; the bracket fixes the support and positions the static calibrator body, and the simulated mirror plate 3 is fixed to the bottom end of the micrometer screw to simulate the measured object. Through the precise cooperation between the differential screw and the fixed sleeve, the displacement of the micrometer screw can be precisely controlled. This design ensures the accuracy and stability of the displacement and provides a reliable testing environment for the displacement sensor. When the differential cylinder is rotated, the micrometer screw will move according to a predetermined pitch (such as the pitch of the screw micrometer is 0.5mm), thereby realizing the precise adjustment of the displacement of the simulated mirror plate 3, so that the design of the differential cylinder makes the operation simple and intuitive, and the displacement can be easily adjusted by rotating the differential cylinder.

[0009] Preferably, the differential cylinder is provided with an equally divided scale along the circumferential direction, and a thread is provided between the differential cylinder and the fixed sleeve, and the rotation of the differential cylinder scale drives the displacement of the micrometer screw. The design of the equally divided scale in the circumferential direction makes the reading more intuitive. The user only needs to observe the scale on the differential cylinder to quickly and accurately obtain the displacement of the micrometer screw. The threaded fit between the differential cylinder and the fixed sleeve has high stability. This design can ensure that the rotation of the differential cylinder and the displacement of the micrometer screw remain accurate and reliable under long-term use or frequent adjustment.

[0010] Preferably, the division range of the differential barrel scale is set to 500-1000, and the thread specification design between the differential barrel and the fixed sleeve ensures that the micrometer screw is displaced by ρmm every time the differential barrel rotates one grid, thereby providing a calibration accuracy of 0.01ρmm. By setting the division range of the differential barrel scale and the thread specification between the fixed sleeve, the precise control of the displacement of the micrometer screw is ensured. For each rotation of the differential barrel, the displacement of the micrometer screw is accurate to ρmm, thereby providing a calibration accuracy of 0.01ρmm, meeting the needs of high-precision measurement. The division range of the scale is set between 500-1000, making it more intuitive and convenient for users to adjust and read. By rotating the differential barrel and observing the scale, users can easily achieve precise displacement control and measurement. Here, ρ is a displacement value. In practical applications, the calibration accuracy is adjusted by assigning a value to ρ.

[0011] Preferably, the main body of the static calibrator also includes but is not limited to several micrometer screw gauges of different precisions. The micrometer screw gauge itself has extremely high measurement accuracy and can provide displacement readings accurate to 0.01 mm or less. This high-precision measurement capability enables the static calibrator to meet the demand for high-precision calibration of displacement sensors. By providing micrometer screw gauges of different precisions, the static calibrator can adapt to test scenarios with different precision requirements. Users can choose the appropriate micrometer head according to their needs to match specific measurement requirements, thereby achieving more flexible and accurate displacement calibration.

[0012] Preferably, the smoothness and flatness of the bottom of the bracket are set to be consistent with the measured object, the bracket is set to a columnar structure with a hollow structure on the side, and the bracket base protruding ring is set at the bottom end of the side; the hollow structure is set to simulate the observation window of the gap between the mirror plate 3 and the displacement sensor. The smoothness and flatness of the bottom of the bracket are consistent with those of the measured object, which can ensure that the contact surface between the displacement sensor and the measured object is flat and smooth during installation, reducing installation errors. In addition, through the observation window, the installation position of the sensor, the size of the gap, etc. can be checked in real time to ensure that the relative position between the sensor and the measured object is correct.

[0013] Furthermore, the bracket is designed as a columnar structure, and the base is protruding and ring-arranged at the bottom of the side, which can enhance the stability of the bracket. The protruding base ring can increase the contact area between the bracket and the mounting surface, and reduce the displacement or offset caused by vibration or other external factors. The observation window of the hollow structure and the easy-to-observe design can shorten the debugging and calibration time.

[0014] Preferably, the material, bottom finish and flatness of the simulated mirror plate 3 are consistent with those of the measured object; the simulated mirror plate 3 is set to a flat surface, and the mounting structure is set vertically. The simulated mirror plate 3 is consistent with the material, finish and flatness of the measured object, and the flat surface design ensures vertical installation, improving calibration precision and measurement accuracy.

[0015] Preferably, the connection between the micrometer screw and the differential barrel or the fixed sleeve is provided with a precision thread structure. The precision thread structure ensures that the relative displacement between the micrometer screw and the differential barrel or the fixed sleeve is extremely accurate when the micrometer screw rotates, and micron-level displacement control can be achieved. This precise fit reduces errors caused by clearance or looseness, and improves the stability and reliability of the measurement. The precision thread structure makes the calibration and maintenance of the micrometer screw simpler and more convenient, and helps to maintain the long-term stability of the measurement accuracy.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model provides a displacement sensor accuracy calibration tool that can provide convenient and fast calibration and inspection. It does not require the removal of the sensor. It can quickly inspect and calibrate the accuracy of the sensor after installation by only accurately changing the distance between the probe and the analog mirror plate 3. This design greatly simplifies the calibration process, improves work efficiency, and reduces maintenance costs.

[0018] 2. The utility model provides a displacement sensor accuracy calibration tool that can provide accurate signal characteristic curve drawing. The tool has the function of redrawing the output signal characteristic curve after the sensor is installed, ensuring that the sensor can provide accurate and reliable displacement data in actual operation. This is crucial for monitoring and control systems, and can effectively avoid system performance degradation or failures caused by sensor errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a displacement sensor accuracy calibration tool.

[0020] Figure 2 The utility model is an exploded view of a displacement sensor accuracy calibration tool.

[0021] Reference numerals:

[0022] 1. Static calibrator body, 2. Bracket, 3. Simulation mirror plate, 4. Micrometer screw, 5. Fixed sleeve, 6. Differential cylinder. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0024] Embodiment 1:

[0025] A displacement sensor accuracy calibration tool of this embodiment, such as Figure 1 and Figure 2 As shown in the figure, the tool is mainly used to calibrate and verify the accuracy of the output signal of the displacement sensor, especially for the displacement sensor based on the eddy current principle. The tool includes a static calibrator body, a bracket and a simulation mirror plate 3, which can simulate precise displacements of different ranges to compare the actual output value of the sensor with the factory test value.

[0026] The static calibrator body 1 is the core component of the tool, and a differential cylinder 6 is arranged around its side, and a micrometer screw 4 is contained inside. One end of the micrometer screw 4 is limited by a fixed sleeve 5 and assembled with the bracket 2, and the other end passes through the bottom end of the differential cylinder 6 and is vertically connected to the analog mirror plate 3. The bottom end of the static calibrator body 1 is connected to the bracket 2 by a fixed connection method to ensure the stability of the entire static calibrator.

[0027] The micrometer screw 4 is assembled with the fixed sleeve 5 through the differential screw to form a precise spiral substructure. When the differential cylinder 6 is rotated, the micrometer screw 4 will be driven to make precise displacement in the fixed sleeve 5. The differential cylinder 6 is arranged on the side of the static calibrator body 1, and an equally divided scale is arranged along the circumferential direction. A thread is arranged between the differential cylinder 6 and the fixed sleeve 5. By rotating the differential cylinder 6, the scale will drive the micrometer screw 4 to move. There is a scale divided into 500 on the circumference of the differential cylinder 6. The thread specification between the differential cylinder 6 and the fixed sleeve 5 can make the micrometer screw 4 move 0.002mm every time the differential cylinder rotates one grid on the scale, that is, the calibration accuracy of the calibration tool is 0.002mm.

[0028] The bracket 2 is used to fix the support and position the static calibrator body 1, ensuring that the micrometer screw 4 can move freely while maintaining the stability of the entire system. The bottom of the bracket 2 is designed to be smooth and the flatness is consistent with the measured object to ensure the accuracy of the test. The side of the bracket 2 has a hollow structure as an observation window for simulating the gap between the mirror plate 3 and the displacement sensor.

[0029] The simulated mirror plate 3 is fixed to the bottom end of the micrometer screw 4 and is used to simulate the object under test. Its material, bottom finish and flatness are consistent with the object under test to simulate the real test environment and improve the calibration accuracy. The simulated mirror plate 3 is set to a flat surface and adopts a vertical installation structure to facilitate alignment with the displacement sensor. The connection between the micrometer screw 4 and the differential cylinder 6 or the fixed sleeve 5 is provided with a precision thread structure to ensure the accuracy and stability of the displacement adjustment.

[0030] The spiral pair structure formed between the micrometer screw 4 and the fixed sleeve 5 in the tool, as well as the precision threaded connection between the micrometer screw 4 and the differential barrel 6, ensures the accuracy and stability of the displacement adjustment, thereby providing high-precision displacement simulation. By rotating the scale of the differential barrel 6, the user can easily control the displacement of the micrometer screw 4 without complicated operating steps or equipment. This intuitive operation makes the calibration process simple and quick.

[0031] The tool can simulate precise displacements of different ranges and is applicable to a variety of displacement sensors based on the eddy current principle. In addition, by replacing the micrometer head with different precision, the tool can further expand its application range. The stable support of the bracket 2 and the simulated mirror plate 3 are consistent with the material, finish and flatness of the measured object, ensuring the authenticity and reliability of the test environment. This helps to reduce the error introduced by the difference in the test environment and improve the calibration accuracy.

[0032] The hollow structure on the side of the bracket 2 serves as an observation window, which allows users to observe the gap between the simulated mirror plate 3 and the displacement sensor, thereby more accurately evaluating the performance of the sensor. Since the tool's structural design is precise and stable, users can repeat the calibration operation multiple times to obtain consistent calibration results, further verifying the reliability and accuracy of the tool.

[0033] The utility model provides a displacement sensor accuracy calibration tool, which can provide convenient and fast calibration and inspection. There is no need to remove the sensor. By only accurately changing the distance between the probe and the analog mirror plate 3, the accuracy of the sensor after installation can be quickly inspected and calibrated. This design greatly simplifies the calibration process, improves work efficiency, and reduces maintenance costs. It can provide accurate signal characteristic curve drawing. The tool has the function of redrawing the output signal characteristic curve after the sensor is installed, ensuring that the sensor can provide accurate and reliable displacement data in actual operation. This is crucial for monitoring and control systems, and can effectively avoid system performance degradation or failure due to sensor errors.

[0034] Embodiment 2:

[0035] The displacement sensor accuracy calibration tool of this embodiment mainly includes three parts: a static calibrator 1, a special bracket 2, and a simulated mirror plate 3. Among them, the static calibrator 1 is composed of three components: a micro screw 4, a fixed sleeve 5, and a differential cylinder 6. The static calibrator 1 is used to manually push the simulated mirror plate forward and backward to simulate the gap size between the measured object and the displacement sensor.

[0036] Among them, the special bracket 2 is used to support and fix the static calibrator. During actual debugging, after cleaning the area near the sensor installation surface, the special bracket 2 in the calibration tool is placed stably on the sensor so that the simulated mirror plate 3 in the calibration tool is centered and vertically aligned with the sensor probe.

[0037] In certain installation environments, when the tested component does not meet the debugging conditions, or it is difficult to debug a specific sensor alone, the compact structure and simple operability of the calibration tool of the present invention can be used to perform accuracy inspection on each installed displacement sensor individually.

[0038] For example, in the heavy-load high-speed thrust bearing test bench test, when it is necessary to demonstrate the oil film thickness between the designed thrust bearing and the mirror plate under working conditions, it is necessary to drill holes in a bearing and install dozens of eddy current displacement sensors. In order to avoid large holes in the bearing, which will affect the quality of the oil film thickness formed during equipment operation, the actual hole size is not in accordance with the size required by the product manual. As a result, the displacement signal output by the sensor in actual operation may be affected by the installation space and is no longer the output signal characteristic curve when leaving the factory.

[0039] When using the special tool of the present invention, the sensor should be connected to the signal receiving system and have the condition of outputting the sensor displacement signal, and firstly adjust the height of the simulation mirror plate 3 to the maximum range of the displacement sensor.

[0040] The simulated mirror plate 3 is driven to gradually approach the displacement sensor according to the required working accuracy value by rotating the static calibrator 1, and the displacement signal value output by the sensor and the displacement value of the actual driving mirror plate movement are recorded at the same time.

[0041] By comparing the actual test values ​​of the sensor within the entire measuring range with the theoretical values ​​on the output signal characteristic curve in the factory technical documents of the sensor, it is possible to check whether the output signal accuracy of the sensor after installation deviates from the factory theoretical value. If the accuracy requirements are not met, the output signal characteristic curve of the displacement sensor can be redrawn according to the displacement value of the actual driving mirror plate movement and the actual test value of the sensor to ensure signal accuracy.

[0042] The displacement sensor precision calibration tool of this embodiment shows significant advantages in high-precision measurement occasions such as heavy-load high-speed thrust bearing test benches. It effectively simulates the gap change between the measured object and the displacement sensor through the precise coordination of the three core components of the static calibrator, the special bracket and the simulation mirror plate 3, thereby ensuring the measurement accuracy of the sensor in practical applications.

[0043] The calibration tool is compact and easy to operate, making it easy to perform individual accuracy checks on each installed displacement sensor even in complex installation environments. This is particularly important in heavy-load, high-speed thrust bearing test bench tests, as it avoids the problem of large bearing openings that may affect the quality of the oil film thickness formed during equipment operation. By rotating the static calibrator to drive the simulated mirror plate 3 gradually close to the displacement sensor, and recording the sensor output displacement signal value and the actual displacement value of the drive mirror plate movement, the performance of the sensor under actual working conditions can be accurately evaluated. This precise calibration method can promptly detect and correct the output signal accuracy deviation after the sensor is installed, ensuring the accuracy of the measurement results.

[0044] The calibration tool also has the function of redrawing the characteristic curve of the displacement sensor output signal. When the accuracy of the sensor output signal does not meet the requirements, the characteristic curve can be redrawn according to the actual data, thereby realizing the accurate calibration of the sensor output signal. This function greatly improves the reliability and stability of the sensor in practical applications. The displacement sensor accuracy calibration tool of this embodiment plays an important role in high-precision measurement occasions such as heavy-load high-speed thrust bearing test benches with its precise design, simple operation and powerful functions, and provides a strong guarantee for the safe operation and accurate measurement of the equipment.

[0045] Embodiment 3:

[0046] A displacement sensor accuracy calibration tool of this embodiment is further described in more detail in the actual application scenario for the calibration tool of Example 2. In the heavy-load high-speed thrust bearing test bench test, when it is necessary to demonstrate the oil film thickness between the designed thrust bearing and the mirror plate under working conditions, it is necessary to open holes on a bearing to install dozens of eddy current displacement sensors. In order to avoid large holes in the bearing, which affects the quality of the oil film thickness formed during the operation of the equipment, the actual hole size is not in accordance with the size required by the product manual, resulting in the displacement signal output by the sensor in actual operation may be affected by the installation space and is no longer the output signal characteristic curve at the factory. The patent of the present invention simulates the up and down movement of the mirror plate 3 to recalibrate the sensor output curve, so that the distance accuracy measured by the sensor is more accurate.

[0047] In the heavy-loaded and high-speed thrust bearing test, the calibration process is dominated by the static calibrator body 1, and its core lies in the precise matching of the differential barrel 6 and the micrometer screw 4. The differential barrel 6 controls the precise displacement of the micrometer screw 4 in the fixed sleeve 5 by rotation, thereby simulating the movement of the actual mirror plate. One end of the micrometer screw 4 is limited by the fixed sleeve 5 and connected to the bracket 2, ensuring the stability and accuracy of the displacement. The bracket 2 not only supports the entire calibration system, but also simulates the actual test environment through the smooth design of its bottom. The simulated mirror plate 3 is fixed at the bottom of the micrometer screw 4, and the displacement of the mirror plate 3 is simulated as the screw moves, thereby collecting and calibrating the data of the eddy current displacement sensor. The observation window facilitates monitoring of the gap changes between the simulated mirror plate 3 and the sensor to ensure the accuracy of the calibration process. The entire system ensures the accuracy and reliability of the displacement data in the heavy-loaded and high-speed thrust bearing test through the precise matching of various components.

[0048] During the calibration process of the heavy-loaded high-speed thrust bearing test bench, the static calibrator body realizes the precise up and down movement of the simulated mirror plate 3 through the spiral pair structure formed by the micrometer screw and the fixed sleeve inside it, as well as the precise control of the differential cylinder. The rotating differential cylinder drives the micrometer screw to move, and then drives the simulated mirror plate 3 to simulate the displacement of the actual mirror plate. At the same time, the output signal of the eddy current displacement sensor is recorded and compared with the factory curve for recalibration. The stable support of the bracket and the setting of the observation window ensure the accuracy and reliability of the calibration process, thereby ensuring the measurement accuracy of the sensor in the actual test.

[0049] In the heavy-loaded high-speed thrust bearing test bench test, in order to accurately describe the oil film thickness between the thrust bearing and the mirror plate under working conditions, as well as the dynamic process of measurement by the eddy current displacement sensor, we can describe it in detail as follows: Equipment setup: First, in order to ensure the normal operation of the heavy-loaded high-speed thrust bearing test bench, it is necessary to calibrate the displacement sensor installed in the bearing before the bearing is installed in the oil groove using a specific calibration tool. This is done to facilitate subsequent debugging and calibration work. Because once the bearing and the thrust mirror plate are installed in the oil groove, it will no longer be convenient to adjust the installation position of the sensor or calibrate the characteristic curve because the gap is very small and the mirror plate completely covers the bearing.

[0050] This calibration tool uses its compactness to simulate the mirror plate before the bearing enters the oil groove, calibrate each sensor individually, and draw the corresponding characteristic curve. After the calibration is completed, each sensor will be finally fixed and then installed into the oil groove together with the bearing to ensure that the sensor will not move after installation into the oil groove. In addition, it is necessary to ensure that the bearing and mirror plate are properly installed in place and the lubrication system is filled with appropriate lubricating oil to ensure the normal operation of the test bench.

[0051] Sensor installation: Dozens of eddy current displacement sensors are installed on the bearing according to the pre-designed opening positions and sizes. These sensors will be used to monitor the displacement changes of the mirror plate relative to the bearing in real time. At the same time, the sensor cables need to be connected to the data receiving and processing equipment to ensure that the equipment can receive and process the displacement output signals calibrated by the sensors in real time, so as to achieve accurate monitoring of the displacement changes of the mirror plate.

[0052] Simulated mirror plate 3 setup: Place simulated mirror plate 3 directly onto the sensor in the bearing shell.

[0053] Displacement simulation: When performing displacement simulation, the simulated mirror plate is controlled to move up and down by manually rotating the differential cylinder 6 to simulate the displacement change of the actual tool in the test. In this process, the displacement signal output by each eddy current displacement sensor needs to be recorded to ensure that the displacement change data of the mirror plate relative to the bearing can be accurately obtained.

[0054] Data comparison: Compare the collected displacement signal with the output signal characteristic curve at the factory to analyze the changes in the sensor output signal.

[0055] Data analysis: Perform data analysis on the collected displacement signals to evaluate the output characteristics of different sensors under different displacements. Pay special attention to the changes in output signals caused by the installation space.

[0056] Calibration operation: Due to the output signal deviation caused by improper sensor installation, a special calibration method is used. By adjusting the simulated mirror displacement one by one with a tool, the signal characteristic curve is redrawn to simulate different oil film thicknesses and calibrate the sensor. The new characteristic curve is applied in the receiving device to ensure that the sensor provides accurate displacement data.

[0057] Sensor installation: Install the calibrated eddy current displacement sensor on the bearing to be tested. Install and calibrate it directly on the test bearing.

[0058] Test operation: Start the heavy-load high-speed thrust bearing test bench and let the bearing shell and mirror plate operate under actual working conditions. After the test bench is installed, the test can be carried out.

[0059] Real-time monitoring: During the test, the output data of the sensor is monitored in real time and compared with the calibration results to ensure that the sensor can provide accurate and reliable displacement data in actual operation.

[0060] Precision control: Throughout the process, special attention should be paid to maintaining the precision and stability of the test equipment to ensure the accuracy of the measurement results.

[0061] Safety: Since the heavy-load high-speed thrust bearing test bench involves dangerous factors such as high-speed rotation and heavy load, safety regulations must be strictly followed during operation to ensure the safety of personnel and equipment.

[0062] Through the above description, we can clearly understand how to measure the oil film thickness between the thrust bearing and the mirror plate through the eddy current displacement sensor in the heavy-load high-speed thrust bearing test bench test, and perform the sensor calibration process. At the same time, it also emphasizes the accuracy control and safety issues that need to be paid attention to in the whole process.

[0063] The process of applying the calibration tool of the utility model to the above scenario is as follows:

[0064] Sensor installation: On the thrust bearing, we carefully select the hole location and control the hole size to minimize the impact on the oil film quality. Dozens of eddy current displacement sensors are installed in these small holes to monitor the displacement change of the mirror plate relative to the bearing, that is, the oil film thickness value.

[0065] Simulation mirror plate 3 design: In order to recalibrate the sensor, we designed a movable simulation mirror plate 3. The material, finish, flatness and other parameters of this simulation mirror plate are consistent with the actual tool to ensure the accuracy of the calibration process. Simulation mirror plate 3 has the same installation structure and size as the actual tool, which can accurately simulate the displacement of the actual tool in the test.

[0066] Calibration process: First, place the tool on the bearing, align the center of the simulated mirror plate 3 in the tool with the displacement sensor embedded in the bearing and fix it. Then, manually rotate the differential cylinder 6 to control the simulated mirror plate 3 to move up and down, simulating the displacement change of the actual tool in the test. In the process of simulating the movement of the mirror plate 3, record the displacement signal output by each eddy current displacement sensor and compare it with the output signal characteristic curve at the factory. According to the comparison results, correct the output curve of the sensor or redraw the signal output characteristic curve to eliminate the error caused by the influence of the installation space.

[0067] Data analysis and calibration: Perform data analysis on the collected displacement signals to evaluate the output characteristics of different sensors under different displacements. Based on the analysis results, calibrate the output curve of the sensor to ensure that it can provide accurate displacement data within the entire measurement range.

[0068] Practical application and verification: After completing the calibration, replace the simulated mirror with the actual tool and put the sensor into actual test. During the test, the output data of the sensor is monitored in real time and compared with the calibration results to verify the effectiveness of the calibration scheme.

[0069] In the heavy-loaded high-speed thrust bearing test bench, the thrust bearing is subjected to huge thrust and complex working conditions caused by high-speed rotation. The oil film is the key lubricating layer between the bearing and the mirror plate, and the change in its thickness directly affects the performance and life of the bearing. Therefore, accurately measuring the oil film thickness is an important task in the test.

[0070] However, due to the limited installation space during the installation of the eddy current displacement sensor, its output signal may no longer conform to the characteristic curve at the factory, which will have a serious impact on the accuracy of the test data.

[0071] In order to solve this problem, the calibration scheme mentioned above is adopted. The displacement change of the actual tool in the test is simulated by moving the simulated mirror plate 3 at the bottom of the tool up and down, and the output curve of the sensor is recalibrated. This scheme not only ensures the accuracy of the test data, but also avoids the potential impact on the oil film quality caused by the over-large opening.

[0072] In practical applications, this calibration scheme has achieved remarkable results. The measurement accuracy of the sensor has been significantly improved, providing more accurate and reliable data support for heavy-load and high-speed thrust bearing tests.

[0073] It should be understood that the embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A displacement sensor accuracy calibration tool, comprising a static calibrator body (1) with a differential cylinder (6) arranged around the side, characterized in that: A micrometer screw (4) is assembled with the bracket (2) after being limited by a fixed sleeve (5), one end of which penetrates and connects to the bottom end of the differential cylinder (6), and the other end of which is vertically connected to the simulated mirror plate (3); the bottom end of the static calibrator body (1) is fixedly connected to the bracket (2); the differential cylinder (6) drives the simulated mirror plate (3) to move through the micrometer screw (4).

2. A displacement sensor accuracy calibration tool according to claim 1, characterized in that: The micrometer screw (4) is assembled with a fixed sleeve (5) via a differential screw, and the rotating differential sleeve (6) drives the micrometer screw (4) to move in the fixed sleeve (5); the bracket (2) fixedly supports and positions the static calibrator body (1), and the simulated mirror plate (3) is fixed to the bottom end of the micrometer screw (4) to simulate the measured object.

3. A displacement sensor accuracy calibration tool according to claim 1 or 2, characterized in that: The differential cylinder (6) is provided with an equally divided scale along the circumferential direction, and a thread is provided between the differential cylinder (6) and the fixed sleeve (5). The rotation of the scale of the differential cylinder (6) drives the micrometer screw (4) to move.

4. A displacement sensor accuracy calibration tool according to claim 3, characterized in that: The scale division range of the differential cylinder (6) is set to 500-1000, and the thread specification design between the differential cylinder (6) and the fixed sleeve (5) ensures that the micrometer screw (4) moves ρmm every time the differential cylinder (6) rotates one grid, thereby providing a calibration accuracy of 0.01ρmm.

5. The displacement sensor accuracy calibration tool according to claim 1, characterized in that: The static calibrator body (1) also includes but is not limited to a number of screw micrometer heads of different precisions.

6. A displacement sensor accuracy calibration tool according to claim 2, characterized in that: The smoothness and flatness of the bottom of the bracket (2) are set to be consistent with the measured object, the bracket (2) is set to be a columnar structure with a hollow structure on the side, and the protruding ring of the base of the bracket (2) is set at the bottom end of the side; the hollow structure is set to be an observation window for simulating the gap between the mirror plate (3) and the displacement sensor.

7. A displacement sensor accuracy calibration tool according to claim 2 or 6, characterized in that: The material, bottom finish and flatness of the simulated mirror plate (3) are consistent with those of the tested piece; the simulated mirror plate (3) is set as a flat surface, and the mounting structure is vertically arranged.

8. A displacement sensor accuracy calibration tool according to claim 1, 2 or 4, characterized in that: The connection between the micrometer screw (4) and the differential cylinder (6) or the fixed sleeve (5) is provided with a precision thread structure.

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