Differential transformer type displacement sensor performance detection system and method

Abstract

The invention discloses a differential transformer type displacement sensor performance detection system and method, and belongs to the technical field of displacement sensor detection. The system is based on a detected displacement sensor and a detected iron core, and comprises a differential transformer type displacement sensor performance detection device, a data collector and a computer, the differential transformer type displacement sensor performance detection device comprises a micrometer micrometer head and a direct current motor device. A tested displacement sensor and a tested iron core are installed on the differential transformer type displacement sensor performance detection device, the tested displacement sensor and a data transmission line of a micrometer micrometer head are respectively connected with a data collector, the data collector is connected with a computer, and a tested displacement range and a collection point are input into the computer. The displacement range is converted into a turn number parameter provided by the direct current motor device, data of the micrometer head and the measured displacement sensor are automatically acquired according to set acquisition points, and a curve is drawn to judge the quality of the measured displacement sensor.

Description

Technical Field

[0001] The present invention relates to the field of displacement sensor detection technology, and more particularly to a differential transformer type displacement sensor performance detection system and method. Background Art

[0002] At present, in the field of modern automation control, sensor technology has been widely adopted and is also a supporting technology for the closed-loop operation of automation control systems. As a highly sensitive signal conversion component, the sensor is the eyes and tentacles of the field of automation control. It can effectively reveal the data during the operation of the automatic control system and ensure that the changes in the system operation data and the system setting data remain within the allowable error range. Differences in sensor materials and manufacturing processes will lead to differences in performance. The allowable error requirements for the operation of various automation control systems are also different. For example, the allowable error of the servo system is very small, requiring the configuration of high-performance sensors.

[0003] However, due to environmental interference and influence, as well as aging and variation of sensitive materials, the performance of the sensor will decline, and the conversion signal will be different or distorted, so performance testing of the sensor delivery or regular performance testing of the sensor in online operation is necessary. However, the existing displacement sensor performance testing method is not well applicable to differential transformer displacement sensors.

[0004] Therefore, how to provide a differential transformer type displacement sensor performance detection system and method is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a differential transformer type displacement sensor performance detection system and method, which can accurately detect and determine the performance indicators of the displacement sensor. The core movement stroke of the displacement sensor and the induced voltage output of the sensor reflect its performance, and the curve drawn by combining the two signals can determine its performance indicators.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A differential transformer type displacement sensor performance detection system, based on a displacement sensor to be tested and an iron core to be tested, comprises:

[0008] Differential transformer type displacement sensor performance detection device, data acquisition device, computer;

[0009] The differential transformer type displacement sensor performance detection device includes: a micrometer head and a DC motor device;

[0010] The displacement sensor to be tested and the iron core to be tested are installed on the differential transformer type displacement sensor performance detection device. The data transmission lines of the displacement sensor to be tested and the micrometer head are respectively connected to the data collector. The data collector is connected to the computer. The displacement range and collection points of the test are input into the computer, and the displacement range is converted into the number of turns parameter provided by the DC motor device. At the same time, the data of the micrometer head and the displacement sensor to be tested are automatically collected according to the set collection points, and a curve is drawn to judge the quality of the displacement sensor to be tested.

[0011] Optionally, the differential transformer type displacement sensor performance detection device further includes:

[0012] Slide bar, measuring block, core mounting seat, spring, sensor mounting seat, base, mounting screws and spacer block;

[0013] The measuring block is fixed to the raising block by means of mounting screws, the raising block is fixed to the base by means of mounting screws, the core mounting seat is screwed into the slide rod by means of threads, and then is installed into the main hole of the measuring block, the spring is placed in the measuring block and leans against the core mounting seat, the measured core is screwed into the core mounting seat by means of threads, the sensor mounting seat is screwed into the screw hole of the measuring block, the spring is compressed to generate thrust on the core mounting seat, and the measured displacement sensor is installed on the sensor mounting seat.

[0014] Optionally, the micrometer head is mounted on the measuring block via its own thread, and the micrometer head is in close contact with the sliding rod, ensuring that when the micrometer head is displaced, the core mounting seat is displaced synchronously.

[0015] Optionally, the DC motor device is inserted into a micrometer head handle and fixedly connected to the base.

[0016] Optionally, the sliding rod and the measuring block are clearance-matched, and the clearance range is 0.002-0.003 mm.

[0017] Optionally, the sizes of the core mounting seat and the sensor mounting seat are adjustable to meet the displacement measurement requirements of sensors with different installation specifications.

[0018] Optionally, a drawing software is installed in the computer to input the distance range and test points to be tested, and a rotation number signal and an information collection signal are output to the DC motor device to realize the automated operation requirements.

[0019] Optionally, drawing software is installed in the computer, and the displacement sensor model and micrometer head displacement stroke are simultaneously collected through a data collector. The drawing software draws a test curve according to the collected data to determine the sensor quality.

[0020] A differential transformer type displacement sensor performance detection method, using any of the differential transformer type displacement sensor performance detection systems described above, comprises the following steps:

[0021] Step 1: Install the micrometer head on the left side of the measuring block, adjust the scale of the micrometer head and lock it;

[0022] Step 2: Place the DC motor device on the base and connect and fix it with the micrometer head;

[0023] Step 3: Remove the sensor mounting base and install the iron core to be measured into the iron core mounting base;

[0024] Step 4: Install the sensor mounting base and fine-tune the installation position according to the force of the spring or the zero position of the iron core to be measured;

[0025] Step 5: Align the measured displacement sensor sleeve hole with the iron core and install it on the sensor mounting base;

[0026] Step 6: Adjust the position of the micrometer head so that the iron core to be measured is located at the zero position of the displacement sensor to be measured, and set the micrometer head to zero;

[0027] Step 7: Evenly distribute the travel measurement points according to the travel of the displacement sensor to be measured;

[0028] Step 8: Turn on the data logger and open the drawing software on the computer;

[0029] Step 9: According to the displacement distance of the stroke measurement point, continuously adjust the micrometer head to move. After moving to the measurement point, click the data collector to record the displacement distance and sensor signal;

[0030] Step 10: Use the drawing software in the computer to generate a test curve based on the recorded points;

[0031] Step 11: Calculate the performance index of the displacement sensor under test through the test curve;

[0032] Step 12: Determine the quality of the sensor by obtaining the test curve and calculating the parameter values.

[0033] It can be known from the above technical solution that compared with the prior art, the present invention discloses a differential transformer type displacement sensor performance detection system and method, which collects the output of the sensor and the micrometer by simultaneously inputting a displacement of the sensor and the micrometer. Because the test accuracy of the micrometer head is 0.001mm, the micrometer and the slide bar are urgently fitted by the spring, the gap between the slide bar and the main hole of the measuring seat is 0.002-0.003mm, and the probability of measurement error of the micrometer tends to zero, the output of the micrometer is accurate, effective, stable and reliable. The output of the sensor is detected by the collected output of the micrometer, and the performance of the sensor is judged accordingly. The specific beneficial effects are as follows:

[0034] (1) The present invention detects the sensing performance of the sensor at a low cost and high resolution, which is beneficial to promoting the technical upgrading of the sensor, the technical upgrading of the automatic control system, and the development of science and technology.

[0035] (2) The detection system provided by the present invention has a simple, compact, practical structure and low manufacturing cost.

[0036] (3) The detection method of the present invention is simple and low-cost. Unqualified sensors can be taken offline in a timely manner, ensuring the safety and reliability of the automatic control system and reducing the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the overall structure of the detection system provided by the present invention;

[0039] Figure 2 It is a main cross-sectional view of the structure of a differential transformer type displacement sensor performance detection device;

[0040] Figure 3 It is a top view of the structure of a differential transformer type displacement sensor performance detection device;

[0041] Figure 4 To detect the displacement sensor curve diagram;

[0042] In the figure:

[0043] 1-micrometer head, 2-slide bar, 3-measuring block, 4-core mounting seat, 5-spring, 6-sensor mounting seat, 7-measured core, 8-measured displacement sensor, 9-base, 10-mounting screw, 11-heightening block, 12-DC motor device, 13-data acquisition device, 14-computer. DETAILED DESCRIPTION

[0044] 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.

[0045] See also Figure 1 The embodiment of the present invention discloses a differential transformer type displacement sensor performance detection system, based on a displacement sensor 8 to be detected and an iron core 7 to be detected, comprising:

[0046] Differential transformer type displacement sensor performance detection device, data acquisition device 13, computer 14.

[0047] For details, see Figure 2-3 , the performance detection device of the differential transformer type displacement sensor includes:

[0048] Micrometer head 1, slide bar 2, measuring block 3, iron core mounting seat 4, spring 5, sensor mounting seat 6, base 9, mounting screws 10, spacer block 11, DC motor device 12.

[0049] Specifically, the raising block 11 is fixed to the base 9 by means of mounting screws 10, the measuring block 3 is fixed to the raising block 11 by means of mounting screws 10, the core mounting seat 4 is screwed into the slide rod 2 by means of threads, and then is installed into the main hole of the measuring block 3, the slide rod 2 and the measuring block 3 are clearance-matched by 0.002 to 0.003 mm, the micrometer micrometer head 1 is installed onto the measuring block 3 by means of its own threads, the spring 5 is placed into the measuring block 3, leaning against the core mounting seat 4, the measured core 7 is screwed into the core mounting seat 4 by means of threads, the sensor mounting seat 6 is screwed into the screw hole of the measuring block 3, the spring 5 is compressed to generate thrust on the core mounting seat 4, the micrometer micrometer head 1 is in close contact with the slide rod 2, thereby ensuring that when the micrometer micrometer head 1 is displaced, the core mounting seat 4 is displaced synchronously, the measured sensor 8 is installed on the sensor mounting seat 6, the DC motor device 12 is inserted into the handle of the micrometer micrometer head 1 and fixedly connected, and installed on the base 9.

[0050] Specifically, after the detection system is installed, the data transmission lines of the sensor 8 to be tested and the micrometer head 1 are connected to the data acquisition device 13 respectively, and the data acquisition device is connected to the computer. The computer 14 inputs the displacement range and collection points of the test, and the computer 14 converts the displacement range into the number of turns parameter provided by the DC motor device 12. At the same time, the data of the micrometer head 1 and the displacement sensor 8 to be tested are automatically collected according to the set collection points, and the curve is drawn to judge the quality of the displacement sensor 8 to be tested.

[0051] In a specific embodiment, the micrometer head 1 is a standard measuring tool purchased, and the measuring accuracy is 0.001mm, which acts on the iron core to generate displacement and display the movement stroke.

[0052] In a specific embodiment, the slide bar 2 is used to transmit the thrust of the micrometer head 1. In order to avoid the lateral force generated by the rotation and propulsion of the micrometer head 1, the slide bar 2 and the main hole size of the measuring block need to be matched to ensure a gap of 2 to 3 μm. At the same time, in order to prevent the slide bar from getting stuck with the measuring block during movement, the slide bar 2 needs to be quenched to 60 HRC.

[0053] In a specific embodiment, the measuring block 3 is used to install a micrometer head, a slide bar, an iron core mounting seat, a spring and a sensor mounting seat, wherein the mounting hole of the slide bar 2 needs to be matched with the slide bar 2 to ensure a gap of 2 to 3 μm.

[0054] In a specific embodiment, one end of the core mounting seat 4 is threadedly connected to the slide rod, and the other end is threadedly connected to the measured core 7 (the core of the measured sensor 8 is the measured core 7), so that the micrometer head 1 is displaced through the slide rod 2 and the core mounting seat 4 to act on the measured core 7.

[0055] In a specific embodiment, the default installation size of the core mounting seat 4 is M4 thread. If the thread of the core to be tested is of other specifications, a thread conversion sleeve must be used for installation.

[0056] In a specific embodiment, the spring 5 is inserted into the other side of the core mounting seat 4, and the sensor mounting seat 6 is installed to compress the space of the spring 5, so that the slide bar 2 generates thrust, and the micrometer head 1 is installed on the other side of the slide bar 2. The micrometer head 1 is in close contact with the slide bar 2, thereby ensuring that when the micrometer head 1 is displaced, the core mounting seat 4 is displaced synchronously.

[0057] In a specific embodiment, the end surface of the sensor mounting seat 6 is used to mount the sensor 8 to be measured.

[0058] In a specific embodiment, the DC motor device 12 is connected and fixed to the handle of the micrometer head 1, and the number of rotations of the DC motor is output through a program set by the computer 14, so that the micrometer head 1 moves to a fixed position according to the program setting.

[0059] In a specific embodiment, the base 9 is used to increase the stability of the differential transformer type displacement sensor performance detection device during operation.

[0060] In a specific embodiment, the heightening block 11 is an integrally raised measuring device to avoid interference with the base.

[0061] In a specific embodiment, the core mounting seat 4 and the sensor mounting seat 6 can be replaced to meet the displacement measurement requirements of sensors with different installation specifications.

[0062] In a specific embodiment, the distance range and test points to be tested are input into the drawing software in the computer 14, and the software program can output the rotation number signal and the information collection signal to the DC motor device to realize the automated operation requirements.

[0063] In a specific embodiment, see Figure 4 , which is a curve diagram for detecting the displacement sensor, wherein line A is an ideal output characteristic curve, and line B is an actual output characteristic curve. The displacement sensor model and micrometer head displacement stroke are collected simultaneously by the data acquisition device 13, and the drawing software of the computer 14 draws a test curve according to the collected data, so as to judge the quality of the sensor.

[0064] A differential transformer type displacement sensor performance detection method, using any of the differential transformer type displacement sensor performance detection systems described above, comprises the following steps:

[0065] Step 1: Install the micrometer head 1 on the left side of the measuring block 3, adjust the scale of the micrometer head 1 to about "25", and tighten it with a wrench; (It can be installed for the first use, and there is no need to disassemble it later)

[0066] Step 2: Place the DC motor device 12 on the base 9 and connect and fix it to the micrometer head 1;

[0067] Step 3: Remove the sensor mounting seat 6 and install the iron core 7 to be measured into the iron core mounting seat 4 (M4);

[0068] Step 4: Install the sensor mounting base 6. The installation position can be slightly adjusted according to the spring 5 force or the zero position of the iron core 7 to be measured;

[0069] Step 5: Align the sleeve hole of the displacement sensor 8 to be measured with the iron core and install it on the sensor mounting seat 6;

[0070] Step 6: Adjust the position of the micrometer head 1 so that the iron core 7 to be measured is located at the zero position of the displacement sensor 8 to be measured, and set the micrometer head 1 to zero;

[0071] Step 7: Evenly distribute the stroke measurement points according to the stroke of the displacement sensor 8 to be measured. The number of measurement points should be no less than 6. The more points there are, the more accurate the measurement value will be.

[0072] Step 8: Turn on the data collector 13 and open the drawing software in the computer 14;

[0073] Step 9: According to the displacement distance of the stroke measurement point, continuously adjust the micrometer head 1 to move, and after moving to the measurement point, click the data collector 13 to record the displacement distance and sensor signal;

[0074] Step 10: Use drawing software to generate a test curve based on the recorded points;

[0075] Step 11: Calculate the performance indicators of the displacement sensor 8 under test through the test curve: linearity, zero voltage, linear range, and resolution;

[0076] Step 12: The quality of the sensor can be determined by the test curves and calculated parameter values ​​obtained from steps 1 to 11.

[0077] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, it corresponds to the method disclosed in the embodiment.

[0078] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A differential transformer type displacement sensor performance detection system, based on the displacement sensor to be tested and the iron core to be tested, characterized in that: include: Differential transformer type displacement sensor performance detection device, data acquisition device, computer; The differential transformer type displacement sensor performance detection device includes: a micrometer head and a DC motor device; The displacement sensor to be tested and the iron core to be tested are installed on the differential transformer type displacement sensor performance detection device. The data transmission lines of the displacement sensor to be tested and the micrometer head are respectively connected to the data collector. The data collector is connected to the computer. The displacement range and collection points of the test are input into the computer, and the displacement range is converted into the number of turns parameter provided by the DC motor device. At the same time, the data of the micrometer head and the displacement sensor to be tested are automatically collected according to the set collection points, and a curve is drawn to judge the quality of the displacement sensor to be tested.

2. A differential transformer type displacement sensor performance detection system according to claim 1, characterized in that: The differential transformer type displacement sensor performance detection device also includes: Slide bar, measuring block, core mounting seat, spring, sensor mounting seat, base, mounting screws and spacer block; The measuring block is fixed to the raising block by means of mounting screws, the raising block is fixed to the base by means of mounting screws, the core mounting seat is screwed into the slide rod by means of threads, and then is installed into the main hole of the measuring block, the spring is placed in the measuring block and leans against the core mounting seat, the measured core is screwed into the core mounting seat by means of threads, the sensor mounting seat is screwed into the screw hole of the measuring block, the spring is compressed to generate thrust on the core mounting seat, and the measured displacement sensor is installed on the sensor mounting seat.

3. A differential transformer type displacement sensor performance detection system according to claim 2, characterized in that: The micrometer head is mounted on the measuring block through its own thread, and the micrometer head is in close contact with the sliding rod, ensuring that when the micrometer head is displaced, the iron core mounting seat is displaced synchronously.

4. A differential transformer type displacement sensor performance detection system according to claim 3, characterized in that: The DC motor device is inserted into the micrometer head handle and fixedly connected, and is installed on the base.

5. A differential transformer type displacement sensor performance detection system according to claim 2, characterized in that: The sliding rod and the measuring block are clearance matched, and the clearance range is 0.002-0.003 mm.

6. A differential transformer type displacement sensor performance detection system according to claim 2, characterized in that: The sizes of the core mounting seat and the sensor mounting seat are adjustable to meet the displacement measurement requirements of sensors with different installation specifications.

7. A differential transformer type displacement sensor performance detection system according to claim 1, characterized in that: The drawing software is installed in the computer to input the distance range and test points to be tested, and the DC motor device is output with a rotation number signal and an information collection signal to realize the automated operation requirements.

8. A differential transformer type displacement sensor performance detection system according to claim 1, characterized in that: The computer is installed with drawing software, and the displacement sensor model and the micrometer head displacement stroke are collected simultaneously through the data collector. The drawing software draws a test curve according to the collected data to judge the quality of the sensor.

9. A method for detecting performance of a differential transformer type displacement sensor, using the differential transformer type displacement sensor performance detection system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Install the micrometer head on the left side of the measuring block, adjust the scale of the micrometer head and lock it; Step 2: Place the DC motor device on the base and connect and fix it with the micrometer head; Step 3: Remove the sensor mounting base and install the iron core to be measured into the iron core mounting base; Step 4: Install the sensor mounting base and fine-tune the installation position according to the force of the spring or the zero position of the iron core to be measured; Step 5: Align the measured displacement sensor sleeve hole with the iron core and install it on the sensor mounting base; Step 6: Adjust the position of the micrometer head so that the iron core to be measured is located at the zero position of the displacement sensor to be measured, and set the micrometer head to zero; Step 7: Evenly distribute the travel measurement points according to the travel of the displacement sensor to be measured; Step 8: Turn on the data logger and open the drawing software on the computer; Step 9: According to the displacement distance of the stroke measurement point, continuously adjust the micrometer head to move. After moving to the measurement point, click the data collector to record the displacement distance and sensor signal; Step 10: Use the drawing software in the computer to generate a test curve based on the recorded points; Step 11: Calculate the performance index of the displacement sensor under test through the test curve; Step 12: Determine the quality of the sensor by obtaining the test curve and calculating the parameter values.

Images