Angle sensor calibration device

Abstract

The utility model relates to the technical field of calibration devices, in particular to an angle sensor calibration device which comprises an operation table, a bearing is fixed at the center of the operation table in a penetrating mode, a shaft rod is arranged on the inner ring wall of the bearing in an interference penetrating mode, a supporting frame is fixed at the upper end of the shaft rod, and the supporting frame is of a T-shaped structure. According to the scheme, rapid switching between absolute angle measurement and relative angle measurement is achieved through the connection plate and the blocking frame structure driven by the air cylinder. During absolute angle measurement, the cylinder retracts the piston rod to enable the blocking frame to be away from the sensor. During relative measurement, the air cylinder pushes the blocking frame to cover the end of the sensor, and the initial reference batten provides a fixed reference point. By means of the design, the problem that a clamp needs to be replaced manually in a traditional calibration device is solved. And in cooperation with accurate positive and negative rotation control of the servo motor, factory calibration (absolute measurement) and on-site calibration (relative measurement) requirements of the sensor can be met at the same time, and the application scene of the device is remarkably expanded.

Description

An angle sensor calibration device Technical Field

[0001] This utility model relates to the field of calibration device technology, and in particular to an angle sensor calibration device. Background Technology

[0002] An angle sensor is a sensor used to measure the rotation angle of an object, and it is widely used in industrial automation, robotics, aerospace, automotive manufacturing, and other fields. With the continuous development of modern industry and technology, the requirements for the accuracy and reliability of angle measurement are becoming increasingly stringent, and angle sensors play a crucial role in this process.

[0003] In industrial automation systems, angle sensors are used to monitor and control the rotation angles of equipment such as robotic arms, conveyor belts, and valves, ensuring the accuracy and stability of the production process. In robotics, angle sensors are used to measure the rotation angles of joints, enabling precise motion control of robots. According to the authorized publication number "CN221649506U", an angle sensor measurement and calibration device is disclosed, including a mounting base. A measuring cylinder is mounted on the upper end of the mounting base, and a fixture platform is mounted inside the measuring cylinder. A support frame is mounted on one side of the upper end of the mounting base, and a sensor calibration mechanism is mounted on the support frame. The sensor calibration mechanism includes a drive motor, and a calibration drum is mounted on the drive end of the drive motor. A support rod is mounted on the lower end of the calibration drum, and an angle encoder is mounted on the end of the support rod. A sensor fixture is mounted on the drive end of the angle encoder, and clamping mechanisms are evenly installed around the inner wall of the sensor fixture. A clamping plate is mounted on the end of the clamping mechanism. This angle sensor measurement and calibration device requires less operator skill, meets on-site metrological needs, improves calibration efficiency, and shortens calibration time, showing promising application prospects in practical work.

[0004] Currently, before using an angle sensor, in order to ensure the accuracy of its angle measurement, it is necessary to compare and calibrate the recorded angle values. This will prevent excessive angle measurement errors during subsequent use of the device. In addition, the measurement process is divided into absolute angle measurement and relative angle measurement. Relative angle measurement requires a fixed point as a reference point. Therefore, it is necessary to design a reference structure that can be used as a reference point according to the actual situation to meet the measurement requirements. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing an angle sensor calibration device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an angle sensor calibration device, including an operating table, a bearing is fixedly fixed through the center of the operating table, a shaft is interference-fitted through the inner ring wall of the bearing, and a support frame is fixed at the upper end of the shaft, the support frame being a T-shaped structure;

[0007] A clamp is fixedly installed at one of the horizontal ends of the support frame. The clamp has a U-shaped structure. An angle sensor is placed in close contact with the inner side of the clamp. A threaded sleeve is fixed through the upper end of the clamp. A threaded knob is threadedly connected to the inner side of the threaded sleeve. A compression pad is fixedly installed at the end of the threaded knob near the angle sensor. The compression pad is made of rubber material. The lower end of the compression pad is set in close contact with the surface of the angle sensor.

[0008] A motor is fixedly mounted on the lower end of the operating table via a bracket. The motor has a drive shaft inside, and the end of the shaft is fixedly assembled with the end of the shaft rod via a coupling.

[0009] In detail, a cylinder is fixedly installed on the outer ring wall of the operating table by a bracket. The cylinder has a piston rod for extension and retraction inside, and a connecting plate is fixedly installed at the end of the piston rod.

[0010] In detail, the connecting plates are symmetrically distributed along both sides of the operating table, and a baffle is fixed between the two connecting plates. The baffle is a circular ring structure.

[0011] In detail, a starting reference plate is fixedly installed on the inner side of the baffle frame, and the initial position of the angle sensor corresponds to the position of the starting reference plate.

[0012] In detail, the lower end of the operating table is fixedly equipped with several feet, which are distributed equidistantly in a ring along the lower end of the operating table.

[0013] In detail, a shelf is fixedly installed at the end of the support frame away from the clamp, and an alignment block is fixedly installed on the side of the shelf away from the support frame. A positioning seat is slidably sleeved on the surface of the alignment block, and a distance sensor is fixedly installed at the lower end of the positioning seat.

[0014] In detail, the alignment block has a groove inside, a locking pin is slidably sleeved inside the groove, and a spring is installed inside the groove. The two ends of the spring are fixedly installed to the inner wall of the groove and the surface of the locking pin, respectively.

[0015] In detail, the surface of the positioning seat is provided with a pin hole, and the surface of the locking pin slides through the interior of the pin hole.

[0016] The design scheme proposed in this utility model has the following beneficial effects in application:

[0017] 1. This solution achieves rapid switching between absolute and relative angle measurements through a cylinder-driven connecting plate and baffle structure. During absolute angle measurement, the cylinder retracts its piston rod, moving the baffle away from the sensor; during relative measurement, the cylinder pushes the baffle to cover the sensor end, with the initial reference plate providing a fixed reference point. This design solves the problem of manually changing fixtures required in traditional calibration devices. Combined with precise forward and reverse rotation control of the servo motor, it can simultaneously meet the requirements of sensor factory calibration (absolute measurement) and on-site calibration (relative measurement), significantly expanding the device's application scenarios.

[0018] 2. As described in point 1, a dual-channel angle verification mechanism is established using an arc length measurement system comprised of a distance sensor at the end of the support frame and the rotation radius. When the motor drives the shaft to rotate, the distance sensor records the displacement in real time, automatically calculates the theoretical angle value using the constant radius, and compares it in real time with the output data of the sensor under test. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 is a bottom view of the overall bottom of this utility model;

[0021] Figure 3 is a schematic diagram of the connection between the clamp and the angle sensor of this utility model;

[0022] Figure 4 is a schematic diagram of the internal structure of this utility model;

[0023] Figure 5 is an enlarged schematic diagram of point A of this utility model.

[0024] In the diagram: 1. Control panel; 11. Bearing; 12. Shaft; 13. Support frame; 14. Clamp; 15. Angle sensor; 16. Threaded sleeve; 17. Threaded knob; 18. Extrusion pad; 19. Motor; 1001. Foot; 2. Cylinder; 21. Connecting plate; 22. Baffle; 23. Starting reference strip; 3. Storage plate; 31. Alignment block; 32. Positioning seat; 33. Distance sensor; 3001. Groove; 3002. Locking pin; 3003. Spring; 3004. Pin hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1

[0027] Referring to Figures 1-5, an angle sensor calibration device includes an operating table 1. A bearing 11 is fixedly fixed through the center of the operating table 1. A shaft 12 is interference-fitted through the inner ring wall of the bearing 11. The shaft 12 can rotate based on the bearing 11. When the angle sensor 15 measures the angle, it can be driven to rotate. A support frame 13 is fixed to the upper end of the shaft 12. The support frame 13 has a T-shaped structure.

[0028] A clamp 14 is fixedly installed at one of the horizontal ends of the support frame 13. The clamp 14 has a U-shaped structure. An angle sensor 15 is placed tightly against the inner side of the clamp 14. The angle sensor 15 is a sensor that can measure the rotation angle of an object. A threaded sleeve 16 is fixedly fixed through the upper end of the clamp 14. A threaded knob 17 is threadedly connected to the inner side of the threaded sleeve 16. A compression pad 18 is fixedly installed at the end of the threaded knob 17 near the angle sensor 15. The compression pad 18 is made of rubber material. The lower end of the compression pad 18 is tightly attached to the surface of the angle sensor 15. When the angle sensor 15 needs to be installed, the angle sensor 15 is first placed into the clamp 14 so that the angle sensor 15 can fit and limit the bottom and inner wall of the clamp 14. Then, by rotating the threaded knob 17, it is threadedly connected to the threaded sleeve 16, so that the compression pad 18 and the angle sensor 15 can fit together.

[0029] The lower end of the control panel 1 is fixedly mounted with a motor 19 by a bracket. The motor 19 has a drive shaft inside. The end of the shaft is fixedly assembled with the end of the shaft 12 by a coupling. The motor 19 is a servo type and is connected to a forward and reverse switch by wires. The forward and reverse switch is model HY2-8.

[0030] It should be further explained that a cylinder 2 is fixedly installed on the outer wall of the operating table 1 by a bracket. The cylinder 2 has a piston rod for extension and retraction inside. A connecting plate 21 is fixedly installed at the end of the piston rod. The extension and retraction of the piston rod of the cylinder 2 can realize the height adjustment of the connecting plate 21. Thus, the connecting plates 21 distributed on both sides can be blocked or removed from the end position of the angle sensor 15, realizing the flexible use of absolute angle measurement and relative angle measurement.

[0031] It should be further explained that the connecting plates 21 are symmetrically distributed along both sides of the operating table 1, and a baffle 22 is fixed between the two connecting plates 21. The baffle 22 is a circular structure. When the relative angle measurement is being checked, the baffle 22 covers the end of the angle sensor 15 and makes the position of the starting reference plate 23 correspond to the position of the angle sensor 15, thereby enabling the determination of the fixed reference point position.

[0032] It should be further noted that a starting reference plate 23 is fixedly installed on the inner side of the baffle 22. The initial position of the angle sensor 15 corresponds to the position of the starting reference plate 23. The relative angle measurement requires a fixed reference point to determine the initial position. In this case, the reference object needs to remain unchanged to ensure that the measured relative angle is accurate.

[0033] It should be further noted that the lower end of the operating table 1 is fixedly equipped with several feet 1001, which are distributed equidistantly in a ring along the lower end of the operating table 1. The support of several feet 1001 can ensure the stable horizontal placement of the operating table 1.

[0034] It should be further explained that a shelf 3 is fixedly installed at the end of the support frame 13 away from the clamp 14, and an alignment block 31 is fixedly installed on the side of the shelf 3 away from the support frame 13. A positioning seat 32 is slidably sleeved on the surface of the alignment block 31, and a distance sensor 33 is fixedly installed at the lower end of the positioning seat 32. The length of the support frame 13 is constant and can be used as the radius. When the support frame 13 rotates, the distance sensor 33, based on the rotation path of the operating table 1, can be used as the arc length. The angle of deflection is calculated by the arc length and the radius, and compared with the angle data measured by the angle sensor 15 to determine the error. The specific method for measuring the angle is as follows:

[0035]

[0036] in: s is radians, s is arc length, and r is radius.

[0037] It should be further explained that the positioning block 31 has a groove 3001 inside, and a locking pin 3002 is slidably sleeved inside the groove 3001. A spring 3003 is provided inside the groove 3001. The two ends of the spring 3003 are fixedly installed to the inner wall of the groove 3001 and the surface of the locking pin 3002, respectively. The spring 3003 can facilitate the extension and retraction of the locking pin 3002. The end face of the locking pin 3002 is an arc surface.

[0038] It should be further explained that the surface of the positioning seat 32 is provided with a pin hole 3004, and the surface of the locking pin 3002 slides through the interior of the pin hole 3004. In order to facilitate the use or recycling of the distance sensor 33, the locking pin 3002 is pressed, so that the locking pin 3002 can compress the spring 3003 into the interior of the groove 3001, thereby allowing the locking pin 3002 to separate from the pin hole 3004, and thus, the positioning seat 32 and the positioning block 31 can be separated.

[0039] Working method: This solution achieves rapid installation and fixation of the angle sensor 15 through a mechanical structure. First, the angle sensor 15 is placed in the U-shaped groove of the clamp 14, so that its bottom and inner wall are in contact, forming a preliminary limit. Then, the threaded knob 17 is rotated to move down along the internal thread of the threaded sleeve 16, pushing the rubber compression pad 18 to press against the upper surface of the angle sensor 15. The rubber compression pad 18 can provide a stable clamping force and avoid scratching the sensor surface. The T-shaped structure design of the support frame 13 ensures the symmetrical distribution of the clamp 14 and the placement plate 3, so that the overall force is balanced. The motor 19 drives the shaft 12 to rotate through the coupling, which drives the support frame 13 and the angle sensor 15 to rotate synchronously, providing controllable motion input for subsequent calibration.

[0040] The cylinder 2 and the baffle 22 enable flexible switching between absolute and relative angle measurement modes. When performing absolute angle calibration, the piston rod of the cylinder 2 retracts, causing the connecting plate 21 and the baffle 22 to move downwards and away from the measurement area of ​​the angle sensor 15. At this time, the sensor only relies on its own reference to measure the rotation angle. If relative angle calibration is required, the cylinder 2 pushes the baffle 22 to cover the end of the sensor. The initial reference plate 23 is aligned with the initial position of the sensor as a fixed reference point. When the motor 19 drives the shaft 12 to rotate, the sensor measurement value is based on the reference plate to calculate the relative deflection angle. The symmetrically distributed connecting plate 21 ensures that the baffle 22 is horizontally stable and avoids tilting errors.

[0041] Quantitative analysis of angle measurement error is achieved using distance sensor 33 and geometric relationships. The length of support frame 13 is constant, serving as the rotation radius R. Distance sensor 33 is mounted on positioning seat 32, with its detection surface facing the rotation path of operating table 1. When motor 19 drives support frame 13 to rotate, distance sensor 33 measures the arc length between itself and the edge of operating table 1 in real time and calculates the angle value in conjunction with the constant radius. This value is compared with the output value of angle sensor 15 to obtain the error. Positioning seat 32 is quickly locked to alignment block 31 by locking pin 3002. Pressing the locking pin compresses spring 3003 to disengage it from pin hole 3004, facilitating the installation and removal of distance sensor 33. This method combines mechanical structure and mathematical calculation to ensure calibration accuracy.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An angle sensor calibration device, comprising an operating table (1), characterized in that: A bearing (11) is fixed through the center of the operating table (1). A shaft (12) is interference-fitted through the inner ring wall of the bearing (11). A support frame (13) is fixed at the upper end of the shaft (12). The support frame (13) has a T-shaped structure. A clamp (14) is fixedly installed at one lateral end of the support frame (13). The clamp (14) has a U-shaped structure. An angle sensor (15) is placed tightly against the inner side of the clamp (14). A threaded sleeve (16) is fixed through the upper end of the clamp (14). The inner side of the sleeve (16) is threaded with a threaded knob (17). A compression pad (18) is fixedly installed at one end of the threaded knob (17) near the angle sensor (15). The compression pad (18) is made of rubber material. The lower end of the compression pad (18) is tightly attached to the surface of the angle sensor (15). The lower end of the operating table (1) is fixedly installed with a motor (19) by a bracket. The motor (19) has a rotating shaft for driving inside. The end of the rotating shaft is fixedly assembled with the end of the shaft rod (12) by a coupling.

2. The angle sensor calibration device according to claim 1, characterized in that: A cylinder (2) is fixedly installed on the outer ring wall of the operating table (1) by a bracket. The cylinder (2) is equipped with a piston rod for extension and retraction, and a connecting plate (21) is fixedly installed at the end of the piston rod.

3. The angle sensor calibration device according to claim 2, characterized in that: The connecting plates (21) are symmetrically distributed on both sides of the operating table (1), and a baffle (22) is fixed between the two connecting plates (21). The baffle (22) is a circular ring structure.

4. The angle sensor calibration device according to claim 3, characterized in that: The inner side of the baffle (22) is fixedly installed with a starting reference plate (23), and the initial position of the angle sensor (15) corresponds to the position of the starting reference plate (23).

5. The angle sensor calibration device according to claim 4, characterized in that: The lower end of the operating table (1) is fixedly equipped with a foot (1001). There are several feet (1001), which are distributed equidistantly in a ring along the lower end of the operating table (1).

6. The angle sensor calibration device according to claim 5, characterized in that: A shelf (3) is fixedly installed at one end of the support frame (13) away from the clamp (14). An alignment block (31) is fixedly installed on the side of the shelf (3) away from the support frame (13). A positioning seat (32) is slidably sleeved on the surface of the alignment block (31). A distance sensor (33) is fixedly installed at the lower end of the positioning seat (32).

7. The angle sensor calibration device according to claim 6, characterized in that: The alignment block (31) has a groove (3001) inside, a locking pin (3002) is slidably sleeved inside the groove (3001), and a spring (3003) is provided inside the groove (3001). The two ends of the spring (3003) are fixedly installed to the inner wall of the groove (3001) and the surface of the locking pin (3002), respectively.

8. The angle sensor calibration device according to claim 7, characterized in that: The surface of the positioning seat (32) is provided with a pin hole (3004), and the surface of the locking pin (3002) slides through the interior of the pin hole (3004).

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