A displacement sensor calibration apparatus

Abstract

The utility model discloses a kind of displacement sensor calibration equipment, including mounting platform (1), sliding table (2), magnet (3) and the calibration plate (4) being set on mounting platform (1), the both ends of the calibration plate (4) are equipped with the positioning pin (5) matched with mounting platform (1), the middle part of the calibration plate (4) is equipped with the positioning seat (6) for magnet (3) is positioned on sliding table (2);By multiple positioning surface, the position of magnet (3) is accurately fixed, after determining the position of magnet (3), magnet (3) is fixed on sliding table (2), so that the position of magnet (3) and sensor (13) can be relatively fixed, workpiece (12) is installed on tooling platform using mounting platform (1) to complete the sensor zero of workpiece (12) and position calibration, solve the problem that conventional adjustment magnet (3) position is time-consuming and inconvenient to measure, precision is not high.

Description

Technical Field

[0001] This utility model belongs to the field of sensor calibration technology. Specifically, this utility model relates to a displacement sensor calibration device. Background Technology

[0002] Hall displacement sensors utilize the principle that the Hall voltage output by the Hall element is proportional to the magnetic field strength. When a magnet is fixed to an object, the object moves the magnet relative to the sensor, causing a change in the magnetic field strength at the sensor. The Hall voltage changes proportionally to the displacement. In practical applications, to accurately obtain the relationship between the displacement of the magnet relative to the workpiece and the Hall voltage, as well as the zero point position, the sensor needs to be calibrated. The calibration accuracy is closely related to the accuracy of the distance between the magnet and the workpiece in the X, Y, and Z directions.

[0003] A specification published on September 14, 2021, with application number 202010080476.6, discloses a Hall sensor calibration method, apparatus, electronic device, and computer-readable storage medium. The method includes calibrating the zero-drift value of the Hall sensor to obtain a target zero-drift value; the zero-drift value is the sampled value of the Hall sensor when the camera is stationary; controlling the camera to move a preset distance to obtain a reference sampled value output by the Hall sensor; determining a reference distance based on the target zero-drift value and the reference sampled value; and calibrating the Hall sensor based on the preset distance and the reference distance to obtain a compensation value corresponding to the preset distance. The above method, apparatus, electronic device, and computer-readable storage medium can improve the accuracy of Hall sensor calibration.

[0004] In existing technologies, calibration typically involves precisely fixing the magnet onto the slide, meaning the center of the magnet needs to be accurately positioned relative to the Hall chip in the X, Y, and Z directions. This requires simultaneous measurement and adjustment, which is time-consuming and inconvenient, and the accuracy is highly dependent on the operator's skill level. Utility Model Content

[0005] The present invention aims to provide a displacement sensor calibration device that is easy to operate and has high accuracy.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a displacement sensor calibration device, including a mounting platform, a slide, a magnet, and a calibration plate set on the mounting platform. The calibration plate has positioning pins at both ends that cooperate with the mounting platform, and a positioning seat in the middle of the calibration plate for positioning the magnet on the slide.

[0007] The bottom of the positioning seat is provided with a baffle, and the end face of the slide table abuts against the baffle.

[0008] The magnet has an L-shaped plate covering its outer side. The magnet and the L-shaped plate are plastically encapsulated to form a magnet assembly, which is installed in a positioning seat.

[0009] The positioning seat has a groove inside, the lower surface of the magnet assembly is attached to the bottom surface of the groove, and the two sides of the lower part of the magnet assembly abut against the surface of the positioning seat.

[0010] The end of the L-shaped plate is on the side of the slide table.

[0011] The slide is provided with a pressure plate, and the end of the L-shaped plate is located between the pressure plate and the slide. The slide is provided with a fixing screw that passes through the pressure plate.

[0012] After the magnet assembly is precisely fixed onto the slide using the calibration plate, the calibration plate is removed, and the workpiece can be installed on the mounting platform. The workpiece is equipped with a sensor, and this calibration device is used to calibrate the sensor on the workpiece.

[0013] The technical effect of this utility model is that the position of the magnet is accurately fixed by multiple positioning surfaces of the calibration plate. After the position of the magnet is determined, the magnet is fixed on the slide table, so that the zero position of the magnet and the sensor can be accurately fixed, which solves the problems of time-consuming adjustment of the magnet position, inconvenient measurement, and low accuracy. Attached Figure Description

[0014] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the structure of a displacement sensor calibration device according to the present invention; Figure 2 for Figure 1 A schematic diagram of a magnet assembly in a displacement sensor calibration device; Figure 3 for Figure 1 A schematic diagram of a workpiece for a displacement sensor calibration device.

[0015] The following are marked in the diagram: 1. Mounting platform; 2. Slide table; 3. Magnet; 4. Calibration plate; 5. Positioning pin; 6. Positioning seat; 7. Baffle; 8. Magnet assembly; 9. L-shaped plate; 10. Pressure plate; 11. Fixing screw; 12. Workpiece; 13. Sensor. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the utility model concept and technical solution, and to facilitate its implementation.

[0017] Please see Figure 1-3 A displacement sensor calibration device includes a mounting platform 1, a slide 2, a magnet 3, and a calibration plate 4 mounted on the mounting platform 1. The calibration plate 4 has positioning pins 5 at both ends that cooperate with the mounting platform 1, and a positioning seat 6 in the middle for positioning the magnet 3 on the slide 2. Multiple positioning surfaces precisely fix the position of the magnet 3. After determining the position of the magnet 3, it is fixed on the slide 2, thus ensuring that the positions of the magnet 3 and the sensor 13 are relatively fixed. This solves the problems of time-consuming, inconvenient, and inaccurate conventional adjustments to the magnet 3 position. After calibration using the calibration device, the device is removed, and the workpiece 12 is mounted on the tooling platform using the pin holes on the mounting platform 1 that cooperate with the positioning pins 5 to complete the positioning of the workpiece 12. The mounting platform 1 is used to fix the relative position of the workpiece 12 and the calibration device.

[0018] The bottom of the positioning seat 6 is provided with a baffle 7, and the end face of the slide 2 abuts against the baffle 7. The position of the slide 2 relative to the mounting platform 1 is determined by the baffle 7. At this time, the relative position of the calibration plate 4 and the mounting platform 1 is also determined. Then the position of the slide 2 is recorded, which is the zero point position of the sensor calibration.

[0019] The magnet 3 has an L-shaped plate 9 covering the magnet 3 on its outer side. The magnet 3 and the L-shaped plate 9 are plastically encapsulated to form a magnet assembly 8, which is installed in the positioning seat 6.

[0020] The positioning seat 6 has a groove inside, and the lower surface of the magnet assembly 8 is attached to the bottom surface of the groove. The two sides of the lower part of the magnet assembly 8 abut against the surface of the positioning seat 6. The slide 2 abuts against the baffle 7, which can determine the X-direction position of the magnet assembly 8 relative to the platform 1. The side of the magnet assembly 8 abuts against the inner wall of the positioning seat 6, which can determine the Y-direction position of the magnet assembly 8 relative to the platform 1. The lower surface of the magnet assembly 8 is attached to the bottom surface of the groove, which can determine the Z-direction position of the magnet assembly 8 relative to the platform 1. Thus, the relative position of the magnet assembly 8 and the platform 1 is determined.

[0021] The slide table 2 is provided with a pressure plate 10, and the end of the L-shaped plate 9 is located between the pressure plate 10 and the slide table 2. The slide table 2 is provided with a fixing screw 11 that passes through the pressure plate 10; the L-shaped plate 9 is fixed on the slide table 2 by using the pressure plate 10 and the fixing screw 11.

[0022] The end of the L-shaped plate 9 is on the side of the slide table 2.

[0023] After the magnet assembly 8 is precisely fixed onto the slide table 2, the calibration plate 4 is removed, and the workpiece 12 can be installed on the mounting platform 1. The workpiece 12 is equipped with a sensor 13, and both ends of the workpiece 12 are also equipped with positioning pins to cooperate in the installation onto the platform 1.

[0024] Working principle: The mounting platform 1 is used to fix the relative position of the workpiece 12 and the calibration equipment, so that the workpiece 12 can be directly installed after the position of the magnet 3 is calibrated. The slide 2 is moved to abut against the baffle 7, so that the position of the magnet assembly 8 relative to the mounting platform 1 in the X direction can be determined. Then the position of the slide 2 is recorded, that is, the zero point position of the magnet assembly 8 relative to the sensor. The magnet assembly 8 is inserted into the groove of the bottom positioning seat 6 of the calibration plate 4. The side of the magnet assembly 8 is attached to the inner wall of the groove, so that the position of the magnet assembly 8 relative to the mounting platform 1 in the Y direction can be determined. The lower surface of the magnet assembly 8 is attached to the bottom surface of the groove, so that the position of the magnet assembly 8 relative to the mounting platform 1 in the Z direction can be determined. Thus, the relative position of the magnet assembly 8 and the mounting platform 1 is determined. Then, the end of the L-shaped plate 9 on the magnet assembly 8 is pushed to abut against the side of the slide 2. The pressure plate 10 is used to press the end of the L-shaped plate 9 tightly onto the slide 2. Then the fixing screws 11 are installed. After calibration, slide the slide 2 to disengage the magnet 3 from the positioning seat 6, remove the calibration plate 4, push the slide 2 to the marked location, then install the workpiece 12 on the mounting platform 1, insert the pin on the workpiece 12 into the pin hole, and calibrate the sensor 13.

[0025] The technical effect of this utility model is that the position of the magnet 3 is accurately fixed by multiple positioning surfaces. After the position of the magnet 3 is determined, the magnet 3 is fixed on the slide table 2, so that the positions of the magnet 3 and the sensor 13 can be relatively fixed and the accurate zero point position can be obtained. This solves the problems that conventional adjustment of the position of the magnet 3 is time-consuming, inconvenient to measure, and has low accuracy.

[0026] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A displacement sensor calibration device, characterized in that: It includes an installation platform (1), a slide (2), a magnet (3) and a calibration plate (4) set on the installation platform (1). The calibration plate (4) has positioning pins (5) at both ends that cooperate with the installation platform (1), and a positioning seat (6) in the middle of the calibration plate (4) for positioning the magnet (3) on the slide (2).

2. The displacement sensor calibration device according to claim 1, characterized in that: The bottom of the positioning seat (6) is provided with a baffle (7), and the end face of the slide (2) abuts against the baffle (7).

3. The displacement sensor calibration device according to claim 1, characterized in that: The magnet (3) has an L-shaped plate (9) covering the magnet (3) on its outer side. The magnet (3) and the L-shaped plate (9) are plastically encapsulated to form a magnet assembly (8). The magnet assembly (8) is installed in the positioning seat (6).

4. The displacement sensor calibration device according to claim 3, characterized in that: The positioning seat (6) has a groove inside, the lower surface of the magnet assembly (8) is attached to the bottom surface of the groove, and the two sides of the lower part of the magnet assembly (8) abut against the surface of the positioning seat (6).

5. A displacement sensor calibration device according to claim 3, characterized in that: The end of the L-shaped plate (9) is on the side of the slide (2).

6. The displacement sensor calibration device according to claim 5, characterized in that: The slide (2) is provided with a pressure plate (10), the end of the L-shaped plate (9) is located between the pressure plate (10) and the slide (2), and the slide (2) is provided with a fixing screw (11) that passes through the pressure plate (10).

7. The displacement sensor calibration device according to claim 1, characterized in that: The mounting platform (1) may also be equipped with a workpiece (12), the workpiece (12) is equipped with a sensor (13), and the bottom of the workpiece (12) is attached to the magnet (3).

Images