Displacement sensor detection tool, system and method

Abstract

The invention relates to displacement sensor detection, in particular to a displacement sensor detection tool, system and method. The tool comprises a base, a shell fixed to the top of the base and an electric displacement table. A through hole is formed in the end face of the side, close to the electric displacement table, of the shell, the displacement sensor is installed in the shell, and a detection shaft of the displacement sensor extends out of the shell through the through hole. A connecting plate is arranged at the top of a sliding table of the electric displacement table; a detection shaft of the displacement sensor is connected with the connecting plate; a scale grating is arranged on a slide rail seat of the electric displacement table, and a grating reading head is arranged at the position, corresponding to the scale grating, of the slide table; a control unit is arranged in the base and is connected with the grating reading head, the electric displacement table and the displacement sensor; the system and the method are realized based on the tool. The consistency of the displacement direction of the electric displacement table and the telescopic direction of the detection shaft can be guaranteed, and the detection error can be reduced; compared with an existing detection mode, the detection precision and the detection efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to displacement sensor detection, and in particular to a displacement sensor detection tool, system and method. Background Art

[0002] Displacement sensor is an important measuring device that can convert mechanical displacement into electrical signals. With the rapid development of military fields such as aerospace, shipbuilding, as well as industrial control and agricultural modernization, the demand for displacement sensors is also continuing to rise. However, during long-term operation, displacement sensors may have measurement deviations, resulting in a decrease in accuracy, so it becomes necessary to calibrate them.

[0003] At present, the commonly used calibration method is to use a standard gauge block as a reference, directly use a displacement sensor to measure the standard gauge block, and then calibrate based on the error between the nominal value of the gauge block and the measured value of the sensor; however, since the positioning and fixation of the displacement sensor and the starting end of its measuring axis are relatively difficult, it is difficult to ensure the parallelism between the gauge block and the sensor measuring axis during the calibration process, which may introduce large errors. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that the existing measuring device is difficult to ensure the parallelism and adaptation degree between the gauge block and the measuring axis, resulting in large measurement errors, and to provide a displacement sensor detection tooling, system and method.

[0005] To solve the above technical problems, the technical solutions provided by the present invention are as follows: A displacement sensor detection tooling comprises a base, a shell fixed on the top of the base and an electric displacement platform; A through hole is provided on one end surface of the housing close to the electric displacement stage, the displacement sensor is installed in the housing, and the detection axis of the displacement sensor extends from the through hole to the outside of the housing; A connecting plate is provided on the top of the slide of the electric displacement stage, and the detection shaft of the displacement sensor is connected to the connecting plate; A scale grating is provided on the slide rail seat of the electric translation stage, and a grating reading head is provided at a position of the slide corresponding to the scale grating; A control unit is arranged in the base, and the control unit is connected with the grating reading head, the electric displacement stage and the displacement sensor.

[0006] Furthermore, the electric displacement platform includes the slide rail seat, a motor is installed on the end surface of the slide rail seat close to the shell, a screw is provided on the output shaft of the motor, and the screw is rotatably installed on the slide rail seat; The slide is threadedly mounted on the screw rod, and the slide is slidably mounted on the slide rail seat; The motor is connected to a control unit.

[0007] Further, the base includes a fixing frame and a vibration isolation table; The vibration isolation platform is fixed to the top of the fixing frame through a plurality of damping brackets, and the housing and the slide rail seat are both fixed to the top of the vibration isolation platform; The sides of the fixing frame are each provided with a fixing plate, the control unit is fixed inside the fixing frame, and the control unit extends from the middle of one of the fixing plates to the outside of the fixing frame.

[0008] Furthermore, the shell is fixed to the top of the vibration isolation platform through a fixing platform.

[0009] Furthermore, the control unit comprises a control chassis, in which a motor controller and a detection system are arranged; The motor controller is connected to the motor and the detection system; the grating reading head and the displacement sensor are connected to the detection system.

[0010] Furthermore, a protective cover is provided on the top of the vibration isolation platform, a feeding port is provided on one pair of side surfaces of the protective cover, and a protective door is provided at the feeding port.

[0011] A displacement sensor detection system includes a central processing module and a power distribution module, and an RJ45 network module, a 4-20mA to RS232 module, an RS232 communication module and an RS485 communication module connected to the central processing module; The power distribution module is connected to the 4-20mA to RS232 module, the RS232 communication module, the central processing module, the RS485 communication module, the motor controller, the displacement sensor and the motor; The RS485 communication module is connected to the grating reading head, the RS232 communication module is connected to the motor controller, and the 4-20mA to RS232 module is connected to the displacement sensor; The central processing module is connected to the host computer via the RJ45 network module; The host computer sends the test signal to the central processing module via the RJ45 network module. The central processing module receives the test signal sent by the host computer and sends it to the motor controller via the RS232 communication module. The motor controller drives the motor to rotate to detect the displacement sensor. The central processing module collects the displacement reading of the grating ruler and the expansion and contraction amount of the displacement sensor through the RS485 communication module and the 4-20mA to RS232 module, and uploads them to the host computer through the RS485 communication module.

[0012] A displacement sensor detection method comprises the following steps: S1. Assemble the displacement sensor detection tooling, and fix the displacement sensor to be detected in the housing of the detection tooling; S2, setting a plurality of evenly distributed detection points within the measurement range of the displacement sensor by the host computer, and converting the plurality of detection points into test signals in sequence by the host computer; S3, the host computer sends the test signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the test signal and generates a control instruction for controlling the motor, and sends the control instruction to the motor controller through the RS232 communication module; S4, the motor controller executes the control instruction and drives the motor to rotate, so that the slide moves on the slide rail seat, and the connecting plate stretches or squeezes the detection axis of the displacement sensor; S5, the central processing module collects the displacement reading of the grating reading head and the expansion and contraction amount of the displacement sensor through the RS485 communication module and the 4-20mA to RS232 module, and uploads them to the host computer through the RS485 communication module; S6. The host computer calibrates the expansion and contraction amount of the displacement sensor according to the displacement reading of the grating reading head. If the difference between the expansion and contraction amount of the displacement sensor and the displacement reading of the grating reading head is within the measurement error range of the displacement sensor, the displacement sensor is qualified, and the detection of the displacement sensor is completed; If the difference between the expansion and contraction amount of the displacement sensor and the displacement reading of the grating reading head does not fall within the measurement error range of the displacement sensor, the displacement sensor is unqualified and the displacement sensor is calibrated. After the calibration is completed, the detection of the displacement sensor is completed.

[0013] Furthermore, in step S6, the method for calibrating the displacement sensor is: S01, setting the number of measurement cycles n through the host computer, and setting m evenly distributed calibration points within the measurement range of the displacement sensor, and the host computer converting the m calibration points into calibration signals in sequence; S02, the host computer sends the calibration signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the calibration signal and generates a calibration control instruction for controlling the motor, and sends the calibration control instruction to the motor controller through the RS232 communication module; S03, the motor controller executes the calibration control instruction and drives the motor to rotate, so that the slide moves on the slide rail seat, and the connecting plate stretches or squeezes the detection axis of the displacement sensor; S04, the central processing module collects the displacement readings of the grating reading head through the RS485 communication module and the 4-20mA to RS232 module , the expansion and contraction amount of the displacement sensor And upload it to the host computer through RS485 communication module; S05, repeat steps S2 to S4 to complete the displacement reading of the grating reading head at m calibration points in n measurement cycles , the expansion and contraction amount of the displacement sensor The collection of The upper computer uses a linear relationship to calculate the reference straight line equation for calibrating the displacement sensor, thereby completing the calibration of the displacement sensor.

[0014] Furthermore, in step S05, the reference straight line equation of the displacement sensor is: ; Where: is the fitting output value of the output of the displacement measuring device at the i-th calibration point; d is the intercept of the reference line, ; k is the slope of the reference straight line, ; is the output value of the displacement measuring device at the i-th calibration point in the j-th stroke; is the average of the output values ​​of each calibration point of the displacement measurement device; is the measured value of the standard at the ith calibration point of the displacement measuring device in the jth stroke; It is the average of the measured values ​​of each standard device of the displacement measurement device; i is the i-th calibration point, i=1, 2, ..., 10, m; j is the order number of the jth measurement trip, j=1, 2,…, n.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The displacement sensor detection tooling, system and method provided by the present invention can achieve axial displacement of the detection axis of the displacement sensor by fixing the displacement sensor in a shell and applying axial thrust or pulling force to the detection axis of the displacement sensor with the help of an electric displacement stage and a connecting plate, thereby ensuring the consistency between the displacement direction of the electric displacement stage and the telescopic direction of the detection axis and reducing the detection error; at the same time, the displacement of the electric displacement stage is measured by a grating scale and a grating reading head, and finally the control unit calibrates the displacement sensor according to the displacement of the electric displacement stage and the telescopic amount detected by the displacement sensor itself; compared with the existing detection method, the manual participation is reduced and the detection accuracy and detection efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the detection tooling according to an embodiment of the present invention; Figure 2This is a schematic diagram of the structure of the detection tooling with the protective cover removed according to an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the vibration isolation table, the electric translation table and the housing in the detection tooling according to the embodiment of the present invention; Figure 4 Schematic diagram of the structure of the detection system according to the embodiment of the present invention.

[0017] Explanation of the reference numerals: 1-base, 101-fixed frame, 102-vibration isolation table, 103-damping bracket, 104-fixed plate, 2-housing, 3-slide rail seat, 4-through hole, 5-displacement sensor, 6-detection axis, 7-motor, 8-screw, 9-slide, 10-connecting plate, 11-scale grating, 12-grating reading head, 13-control unit, 131-control chassis, 14-fixed table, 15-protective cover, 16-protective door. DETAILED DESCRIPTION

[0018] The technical solutions in the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0019] like Figure 1 and Figure 2 As shown, a displacement sensor detection tooling includes a base 1, a shell 2 fixed to the top of the base 1, and an electric displacement table; the electric displacement table includes a slide rail seat 3, a motor 7 is installed on the end face of the slide rail seat 3 close to the shell 2, a screw 8 is provided on the output shaft of the motor 7, and the screw 8 is rotatably installed on the slide rail seat 3; a slide 9 is threadedly installed on the screw 8, and the slide 9 is slidably installed on the slide rail seat 3; when in use, the motor 7 drives the screw 8 to rotate, so that the slide 9 threadedly connected to the screw 8 is linearly displaced on the slide rail seat 3.

[0020] In order to facilitate the detection of the displacement sensor 5, Figure 2 and Figure 3 As shown, a through hole 4 is opened on one end surface of the housing 2 close to the electric displacement stage, a displacement sensor 5 is installed in the housing 2 , and a detection axis 6 of the displacement sensor 5 extends from the through hole 4 to the outside of the housing 2 .

[0021] In order to realize the connection between the electric translation stage and the displacement sensor detection shaft 6, as shown in FIG. Figure 2 and Figure 3 As shown, a connecting plate 10 is provided on the top of the slide 9, and a through hole is opened on the connecting plate 10. The detection shaft 6 of the displacement sensor 5 passes through the through hole on the connecting plate 10, and the detection shaft 6 is fixed to the connecting plate 10 by two nuts.

[0022] In order to calibrate the displacement of the displacement sensor 5, Figure 2 and Figure 3 As shown, a scale grating 11 is provided on the slide rail seat 3, and a grating reading head 12 is provided at a position of the slide table 9 corresponding to the scale grating 11.

[0023] like Figure 1 and Figure 2 As shown, a control unit 13 is provided in the base 1, and the control unit 13 includes a control box 131, and a motor controller and a detection system are provided in the control box 131; the motor controller is connected to the motor 7 and the detection system, and the motor 7 is controlled to rotate by the motor controller, and the detection shaft 6 of the displacement sensor 5 is further stretched or compressed by the electric translation stage through the connecting plate 10; the grating reading head 12 and the displacement sensor 5 are connected to the detection system; when the detection shaft 6 of the displacement sensor 5 is stretched or compressed, the extension and contraction amount of the displacement sensor 5 and the displacement reading of the grating reading head 12 are uploaded to the detection system, and the detection system is used for proofreading.

[0024] like Figure 1 and Figure 2 As shown, in order to increase the height of the detection area and improve the accuracy of the detection results, the base 1 includes a fixed frame 101 and a vibration isolation table 102; the vibration isolation table 102 is fixed to the top of the fixed frame 101 through a plurality of damping brackets 103, the shell 2 is fixed to the top of the vibration isolation table 102 through a fixed table 14, and the slide rail seat 3 is fixed to the top of the vibration isolation table 102; fixed plates 104 are provided on the sides of the fixed frame 101, the control unit 13 is fixed inside the fixed frame 101, and the control unit 13 extends from the middle of one of the fixed plates 104 to the outside of the fixed frame 101.

[0025] like Figure 1 As shown, in order to isolate the detection area, that is, the working area of ​​the electric translation stage, a protective cover 15 is provided on the top of the vibration isolation platform 102, and a pair of side surfaces of the protective cover 15 are each provided with a loading port, and a protective door 16 is provided at the loading port.

[0026] like Figure 4 As shown, the present invention also provides a displacement sensor detection system, including a central processing module and a power distribution module, and an RJ45 network module, a 4-20mA to RS232 module, an RS232 communication module and an RS485 communication module connected to the central processing module; The power distribution module is connected to the 4-20mA to RS232 module, the RS232 communication module, the central processing module, the RS485 communication module, the motor controller, the displacement sensor 5 and the motor 7; The RS485 communication module is connected to the grating reading head 12, the RS232 communication module is connected to the motor controller, and the 4-20mA to RS232 module is connected to the displacement sensor 5; The central processing module is connected to the host computer through the RJ45 network module; The host computer sends the test signal to the central processing module via the RJ45 network module. The central processing module receives the test signal sent by the host computer and sends it to the motor controller via the RS232 communication module. The motor controller drives the motor 7 to rotate to detect the displacement sensor 5. The central processing module collects the displacement reading of the grating ruler and the extension and contraction amount of the displacement sensor 5 through the RS485 communication module and the 4-20mA to RS232 module, and uploads them to the host computer through the RS485 communication module.

[0027] The present invention also provides a detection method based on the above displacement sensor detection system, and the specific steps are as follows: S1, assembling a displacement sensor detection tool, and fixing the displacement sensor 5 to be detected in the housing 2 of the detection tool; S2. A plurality of evenly distributed detection points are set within the measuring range of the displacement sensor by the host computer, and the host computer converts the plurality of detection points into test signals in sequence; Specifically, according to the detection requirements, multiple detection points are input into the host computer to ensure that the detection points are evenly distributed within the measurement range of the displacement sensor, and the host computer generates a test signal based on the input detection points; S3, the host computer sends the test signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the test signal and generates a control instruction for controlling the motor 7, and sends the control instruction to the motor controller through the RS232 communication module; S4, the motor controller executes the control instruction and drives the motor 7 to rotate, so that the slide 9 moves on the slide rail seat 3, and the connecting plate 10 stretches or squeezes the detection shaft 6 of the displacement sensor 5; S5, the central processing module collects the displacement readings of the grating reading head 12 and the telescopic amount of the displacement sensor 5 through the RS485 communication module and the 4-20mA to RS232 module, and uploads it to the host computer through the RS485 communication module; S6, the host computer calibrates the expansion and contraction amount of the displacement sensor 5 according to the displacement reading of the grating reading head 12. If the difference between the expansion and contraction amount of the displacement sensor 5 and the displacement reading of the grating reading head 12 is within the measurement error range of the displacement sensor 5, the displacement sensor 5 is qualified, and the detection of the displacement sensor 5 is completed; If the difference between the expansion and contraction amount of the displacement sensor 5 and the displacement reading of the grating reading head 12 does not fall within the measurement error range of the displacement sensor 5, the displacement sensor 5 is unqualified and the displacement sensor 5 is calibrated; the method for calibrating the displacement sensor is: S01, setting the number of measurement cycles n through the host computer, and setting m evenly distributed calibration points within the measurement range of the displacement sensor, and the host computer converting the m calibration points into calibration signals in sequence; Specifically, according to the calibration requirements, multiple calibration points are input into the host computer to ensure that the calibration points are evenly distributed within the measurement range of the displacement sensor, and the host computer generates a calibration signal based on the input calibration points; S02, the host computer sends the calibration signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the calibration signal and generates a calibration control instruction for controlling the motor 7, and sends the calibration control instruction to the motor controller via the RS232 communication module; S03, the motor controller executes the calibration control instruction and drives the motor 7 to rotate, so that the slide 9 moves on the slide rail seat 3, and the connecting plate 10 stretches or squeezes the detection shaft 6 of the displacement sensor 5; S04, the central processing module collects the displacement readings of the grating reading head 12 through the RS485 communication module and the 4-20mA to RS232 module respectively , the expansion and contraction amount of displacement sensor 5 And upload it to the host computer through RS485 communication module; S05, repeat steps S2 to S4 to complete the displacement reading of the grating reading head 12 at m calibration points in n measurement cycles , the expansion and contraction amount of displacement sensor 5 The collection of The reference straight line equation of the displacement sensor is calculated by the host computer using a linear relationship: ; Where: is the fitting output value of the output of the displacement measuring device at the i-th calibration point; d is the intercept of the reference line, ; k is the slope of the reference straight line, ; is the output value of the displacement measuring device at the i-th calibration point in the j-th stroke; is the average of the output values ​​of each calibration point of the displacement measurement device; is the measured value of the standard at the ith calibration point of the displacement measuring device in the jth stroke; It is the average of the measured values ​​of each standard device of the displacement measurement device; i is the i-th calibration point, i=1, 2, ..., 10, m; j is the order number of the jth measurement trip, j=1, 2,…, n.

[0028] After the calculation is completed, the calibration of the displacement sensor is completed, and the detection of the displacement sensor 5 is completed at the same time.

[0029] In other embodiments of the present invention, the displacement of the electric translation stage may be measured by a laser rangefinder.

[0030] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A displacement sensor detection tool, characterized in that: It comprises a base (1), and a shell (2) and an electric displacement stage fixed on the top of the base (1); A through hole (4) is provided on an end surface of the housing (2) close to the electric displacement stage, a displacement sensor (5) is installed in the housing (2), and a detection axis (6) of the displacement sensor (5) extends from the through hole (4) to the outside of the housing (2); A connecting plate (10) is provided on the top of the slide table (9) of the electric displacement table, and a detection shaft (6) of the displacement sensor (5) is connected to the connecting plate (10); A scale grating (11) is provided on the slide rail seat (3) of the electric displacement stage, and a grating reading head (12) is provided at a position of the slide table (9) corresponding to the scale grating (11); A control unit (13) is provided in the base (1), and the control unit (13) is connected to the grating reading head (12), the electric displacement stage and the displacement sensor (5).

2. The displacement sensor detection tooling according to claim 1, characterized in that: The electric displacement platform comprises the slide rail seat (3), a motor (7) is mounted on the end surface of the slide rail seat (3) close to the housing (2), a screw rod (8) is arranged on the output shaft of the motor (7), and the screw rod (8) is rotatably mounted on the slide rail seat (3); The slide table (9) is threadedly mounted on the screw rod (8), and the slide table (9) is slidably mounted on the slide rail seat (3); The motor (7) is connected to a control unit (13).

3. The displacement sensor detection tooling according to claim 1, characterized in that: The base (1) comprises a fixing frame (101) and a vibration isolation platform (102); The vibration isolation platform (102) is fixed to the top of the fixing frame (101) via a plurality of damping brackets (103), and the housing (2) and the slide rail seat (3) are both fixed to the top of the vibration isolation platform (102); A fixing plate (104) is provided on the side of the fixing frame (101), the control unit (13) is fixed inside the fixing frame (101), and the control unit (13) extends from the middle of one of the fixing plates (104) to the outside of the fixing frame (101).

4. The displacement sensor detection tooling according to claim 3, characterized in that: The shell (2) is fixed to the top of the vibration isolation platform (102) via a fixing platform (14).

5. The displacement sensor detection tooling according to claim 1, characterized in that: The control unit (13) comprises a control chassis (131), wherein the control chassis (131) is provided with a motor controller and a detection system; The motor controller is connected to the motor (7) and the detection system; the grating reading head (12) and the displacement sensor (5) are connected to the detection system.

6. The displacement sensor detection tooling according to claim 3, characterized in that: A protective cover (15) is provided on the top of the vibration isolation platform (102), and a feeding port is provided on one pair of side surfaces of the protective cover (15), and a protective door (16) is provided at the feeding port.

7. A displacement sensor detection system, characterized in that: It includes a central processing module and a power distribution module, as well as an RJ45 network module, a 4-20mA to RS232 module, an RS232 communication module and an RS485 communication module connected to the central processing module; The power distribution module is connected to a 4-20mA to RS232 module, an RS232 communication module, a central processing module, an RS485 communication module, a motor controller, a displacement sensor (5) and a motor (7); The RS485 communication module is connected to the grating reading head (12), the RS232 communication module is connected to the motor controller, and the 4-20mA to RS232 module is connected to the displacement sensor (5); The central processing module is connected to the host computer via the RJ45 network module; The host computer sends the test signal to the central processing module via the RJ45 network module. The central processing module receives the test signal sent by the host computer and sends it to the motor controller via the RS232 communication module. The motor controller drives the motor (7) to rotate to detect the displacement sensor (5). The central processing module collects the displacement reading of the grating ruler and the expansion and contraction amount of the displacement sensor (5) respectively through the RS485 communication module and the 4-20mA to RS232 module, and uploads them to the host computer through the RS485 communication module.

8. A displacement sensor detection method, characterized in that: The steps include: S1, assembling a displacement sensor detection tool, and fixing the displacement sensor (5) to be detected in a housing (2) of the detection tool; S2, setting a plurality of evenly distributed detection points within the measurement range of the displacement sensor by the host computer, and converting the plurality of detection points into test signals in sequence by the host computer; S3, the host computer sends the test signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the test signal and generates a control instruction for controlling the motor (7), and sends the control instruction to the motor controller via the RS232 communication module; S4, the motor controller executes the control instruction and drives the motor (7) to rotate, so that the slide (9) moves on the slide rail seat (3), and the connecting plate (10) stretches or squeezes the detection shaft (6) of the displacement sensor (5); S5, the central processing module collects the displacement reading of the grating reading head (12) and the extension amount of the displacement sensor (5) through the RS485 communication module and the 4-20mA to RS232 module, and uploads them to the host computer through the RS485 communication module; S6, the upper computer calibrates the expansion and contraction amount of the displacement sensor (5) according to the displacement reading of the grating reading head (12); if the difference between the expansion and contraction amount of the displacement sensor (5) and the displacement reading of the grating reading head (12) is within the measurement error range of the displacement sensor (5), the displacement sensor (5) is qualified, and the detection of the displacement sensor (5) is completed; If the difference between the expansion and contraction amount of the displacement sensor (5) and the displacement reading of the grating reading head (12) does not fall within the measurement error range of the displacement sensor (5), the displacement sensor (5) is unqualified, and the displacement sensor (5) is calibrated. After the calibration is completed, the detection of the displacement sensor (5) is completed.

9. The displacement sensor detection method according to claim 8, characterized in that: In step S6, the method for calibrating the displacement sensor is: S01, setting the number of measurement cycles n through the host computer, and setting m evenly distributed calibration points within the measurement range of the displacement sensor, and the host computer converting the m calibration points into calibration signals in sequence; S02, the host computer sends the calibration signal to the central processing module through the RJ45 network module in turn; The central processing module analyzes the calibration signal and generates a calibration control instruction for controlling the motor (7), and sends the calibration control instruction to the motor controller via the RS232 communication module; S03, the motor controller executes the calibration control instruction and drives the motor (7) to rotate, so that the slide (9) moves on the slide rail seat (3), and the connecting plate (10) stretches or squeezes the detection shaft (6) of the displacement sensor (5); S04, the central processing module collects the displacement readings of the grating reading head (12) through the RS485 communication module and the 4-20mA to RS232 module respectively , the expansion and contraction amount of the displacement sensor (5) And upload it to the host computer through the RS485 communication module; S05, repeating steps S2 to S4 to complete the displacement reading of the grating reading head (12) at m calibration points in n measurement cycles , the expansion and contraction amount of the displacement sensor (5) The collection of The upper computer uses a linear relationship to calculate the reference straight line equation for calibrating the displacement sensor, thereby completing the calibration of the displacement sensor.

10. The displacement sensor detection method according to claim 9, characterized in that: In step S05, the reference straight line equation of the displacement sensor is: ； Where: is the fitting output value of the output of the displacement measuring device at the i-th calibration point; d is the intercept of the reference line, ; k is the slope of the reference straight line, ; is the output value of the displacement measuring device at the i-th calibration point in the j-th stroke; is the average of the output values ​​of each calibration point of the displacement measurement device; is the measured value of the standard at the ith calibration point of the displacement measuring device in the jth stroke; It is the average of the measured values ​​of each standard device of the displacement measurement device; i is the i-th calibration point, i=1, 2, ..., 10, m; j is the order number of the jth measurement trip, j=1, 2,…, n.

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