An angle sensor offline calibration device
By designing a coaxial, vertically arranged stepper motor, adapter shaft, and test base, combined with set screws, spring pins, and magnetic proximity switches, the concentricity deviation and observation deviation problems of the angle sensor calibration device were solved, realizing a high-precision, automated calibration process suitable for mass production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING HEGUANG FEIYI ELECTROMECHANICAL TECH CO LTD
- Filing Date
- 2022-07-26
- Publication Date
- 2026-07-17
AI Technical Summary
Existing offline calibration devices for angle sensors suffer from concentricity deviations, which can easily cause shaft hole eccentricity and affect calibration accuracy. Furthermore, the angle information of the encoder disk is easily read by manual observation, which can lead to observational errors. The existing technology is not suitable for mass production and batch calibration.
An offline calibration device for an angle sensor was designed. It uses a coaxial and vertically arranged stepper motor, adapter shaft and test seat. The device uses a combination of set screw and spring pin for limiting, combined with quick gripper and magnetic proximity switch to achieve automated calibration, avoid the influence of gravity and assembly errors, and improve concentricity and calibration accuracy.
It improves the calibration accuracy of angle sensors, reduces product defect rates, simplifies operation procedures, and increases calibration speed and accuracy, making it suitable for mass production.
Smart Images
Figure CN115290027B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of industrial production technology, and in particular to an offline calibration device for an angle sensor. Background Technology
[0002] The calibration method for angle sensors usually involves mounting an angle measuring instrument with a different working principle and a higher level of accuracy on the same axis as the angle sensor. The angle measuring instrument is rotated to several accurate angular positions, and the angle information is programmed into the angle sensor's storage unit using special tools. Usually, at least two parameters need to be programmed to complete the calibration.
[0003] Existing methods for programming and calibrating angle sensors typically involve selecting a high-precision angle measuring instrument, such as a high-precision code disk, as a reference element. The product to be calibrated is coaxially assembled with the code disk on a specific fixture. Two or more positional information points are determined by rotating the code disk, and this information is then programmed into the angle sensor to be calibrated. This process enables the programming of the angle sensor. During calibration, the angle sensor and the code disk must be assembled concentrically, with no gaps in the intermediate transition, to ensure that the rotation angle of the code disk matches that of the angle sensor. Only in this way can the calibration results be accurate.
[0004] Current practices often employ horizontal mounting, where the encoder and angle sensor are concentrically and horizontally fixed to a single device, with screws securing the shaft holes. A major drawback of horizontal mounting is that, due to gravity, the core shafts ensuring concentricity, including the motor shaft and the sensor shaft, will naturally sag. The degree of sag is determined by their respective masses and bearing clearances, leading to concentricity deviations. Furthermore, the single-sided clamping method for fixing the shaft holes easily causes eccentricity, affecting calibration accuracy. Secondly, the encoder angle information is read manually, which is prone to observational biases, further contributing to calibration errors. Even using an encoder as a standard unit introduces assembly errors due to adapter fixing. Therefore, existing techniques are only suitable for laboratory research and not for large-scale production calibration. This application provides an offline calibration device for angle sensors to meet these requirements. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide an offline calibration device for angle sensors to solve the problems of existing offline calibration devices for angle sensors, which have concentricity deviation, which can easily cause shaft hole eccentricity and affect calibration accuracy. Secondly, the angle information of the code disk is read by human observation, which is prone to observation deviation and will also bring calibration error. Even if the encoder is used as the standard unit, there will be assembly error caused by the conversion and fixing. Therefore, the existing technical means can only meet the needs of laboratory research and are not suitable for large-scale production and batch calibration work.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:
[0007] A line calibration device for an angle sensor includes a fixed base, a top cover plate fixedly connected to the top of the fixed base, a test base for supporting the angle sensor housing fixedly connected to the top cover plate, an adapter shaft for limiting the angle sensor shaft being fitted inside the test base, a positioning component for centering and limiting the angle sensor shaft being mounted on the adapter shaft, a quick-gripper for cooperating with the test base to limit the angle sensor housing being mounted on the test base, and a stepper motor for calibrating the angle sensor shaft in cooperation with the adapter shaft and the positioning component being fixedly connected inside the fixed base. The motor, the adapter shaft, and the test base are coaxial and arranged vertically. The top of the adapter shaft has a first limiting hole, which is a square hole. Four third through holes are evenly arranged around the circumference of the adapter shaft. The third through holes are connected to the first limiting holes. The positioning component includes a set screw that is fixedly connected to the third through hole by a thread. A top pin is slidably sleeved in the third through hole and extends through and into the first limiting hole. A spring is fixedly sleeved at the end of the top pin away from the first limiting hole. The end of the spring away from the top pin abuts against the set screw.
[0008] Preferably, the third through hole is a countersunk hole, a limiting ring is fixedly sleeved on the top pin, the limiting ring abuts against the inner wall of one side of the third through hole, and the end of the top pin located in the first limiting hole has a chamfer.
[0009] Preferably, the upper cover plate has an eccentrically formed first mounting hole, and the test seat is fixedly connected to the upper cover plate through the first mounting hole.
[0010] Preferably, a plurality of first limiting sleeves are fixedly connected to the test base, and the quick gripper is fixedly connected to the quick gripper through the first limiting sleeves.
[0011] Preferably, the test base is fixedly connected to the first mounting hole by bolts, the test base is fixedly connected to the top mounting hole of the stepper motor by bolts, and the adapter shaft is fixedly connected to the output end of the stepper motor by bolts.
[0012] Preferably, the test base has a first limiting groove adapted to the housing of the angle sensor, a connecting flange is fixedly sleeved in the middle of the test base, the connecting flange is fixedly sleeved with the first mounting hole, a first through hole adapted to the adapter shaft is opened at the bottom of the first limiting groove, a first adapter groove adapted to the stepper motor positioning ring is opened at the bottom of the test base, and a plurality of process grooves are evenly arranged around the bottom of the test base.
[0013] Preferably, the top of the adapter shaft is further provided with a second adapter groove that communicates with the first limiting hole.
[0014] Preferably, a second through hole communicating with the first through hole is provided on one side of the test base, a proximity switch is fixedly sleeved in the second through hole, a second limiting groove coaxial with the second through hole is provided on the adapter shaft, a magnet is fixedly sleeved in the second limiting groove, a data interface, a display screen and multiple buttons are fixedly installed on the top of the upper cover plate, a motor driver is fixedly installed in the fixed base, a control panel is fixedly connected to the side of the motor driver away from the stepper motor, and the stepper motor, the data interface, the buttons, the display screen, the motor driver and the control panel are electrically connected.
[0015] Preferably, the bottom of the fixing base is provided with a plurality of support pads evenly arranged and fixedly connected around the perimeter, and the support pads are made of rubber.
[0016] Preferably, the bottom of the adapter shaft is provided with a relief groove that is adapted to the output shaft of the stepper motor, and the relief groove is clearance-fitted with the output shaft of the stepper motor.
[0017] Compared with the prior art, the present invention has at least the following beneficial effects:
[0018] In the above solution, the coaxial and vertically arranged stepper motor, adapter shaft, and test base can avoid the influence of gravity on the system concentricity, improve the assembly concentricity level, reduce the calibration error of the angle sensor, and reduce the product defect rate.
[0019] By setting a set screw to abut one end of the spring, the spring, under its own elastic force, pushes the top pin along the axial direction of the third through hole towards the side closer to the first limiting hole. The top pin abuts around the square rotating shaft of the angle sensor under test, eliminating the clearance between the rotating shaft of the angle sensor under test and the shaft hole of the first limiting hole, avoiding eccentricity, and ensuring the concentricity requirement of the assembly. The housing of the angle sensor under test is limited by the adapter shaft, and the top of the angle sensor under test is limited by the vertical pressing and fastening method of the quick clamp. Compared with the traditional screw fixing or chuck fixing method, it can avoid the concentricity error caused by the precision deviation of the screw hole or chuck to the greatest extent, and improve the calibration accuracy.
[0020] By setting a stepper motor as the angle reference source, automated operation can be achieved, and the installation of a code disk or encoder as a reference can be saved. This can reduce assembly errors caused by too many adapters and improve the accuracy of calibration.
[0021] The upper cover plate on the adapter shaft limits the placement angle of the housing of the angle sensor under test, and works with the quick clamp to completely limit the housing of the angle sensor under test, preventing the angle sensor under test from moving during the calibration process. The stepper motor, adapter shaft, test base and upper cover plate are fixed with bolts. The structure is simple and easy to disassemble and maintain.
[0022] By setting a magnet and a proximity switch, the stepper motor can always rotate from a fixed starting point. Several calibration points can be preset according to the range and accuracy requirements. When calibrating the angle sensor to be measured, it can be operated by pressing a button, which is convenient and quick, improves the calibration speed of the staff, and facilitates data observation through the display screen, reducing the error of reading parameters. Attached Figure Description
[0023] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.
[0024] Figure 1 A schematic diagram of the three-dimensional structure of the offline calibration device for the angle sensor and the assembled angle sensor.
[0025] Figure 2 A schematic diagram of the three-dimensional structure of the offline calibration device for the angle sensor;
[0026] Figure 3 A schematic diagram of the three-dimensional structure of the offline calibration device for the angle sensor after removing the adapter shaft, test seat, and quick clamp;
[0027] Figure 4 This is a magnified three-dimensional structural diagram of the test stand from a first-person perspective;
[0028] Figure 5 This is a magnified three-dimensional structural diagram of the test stand from a second perspective.
[0029] Figure 6 This is a three-dimensional enlarged structural diagram of the adapter shaft;
[0030] Figure 7 This is a cross-sectional enlarged three-dimensional structural diagram of the adapter shaft and positioning components after assembly.
[0031] [Figure Labels]
[0032] 1. Fixed base; 2. Stepper motor; 3. Adapter shaft; 4. Magnet; 5. Set screw; 6. Spring; 7. Top pin; 8. Limiting ring; 9. Top cover plate; 10. Test base; 11. Proximity switch; 12. Quick clamp; 13. Data interface; 14. Button; 15. Display screen; 16. Motor driver; 17. Support pad; 18. First mounting hole; 19. First limiting groove; 20. First limiting sleeve; 21. First through hole; 22. Connecting flange; 23. Second through hole; 24. First adapter groove; 25. Process groove; 26. Third through hole; 27. First limiting hole; 28. Second adapter groove; 29. Second limiting groove; 30. Positioning component; 31. Relief groove.
[0033] As shown in the figure, in order to clearly illustrate the structure of the embodiment of the present invention, specific structures and devices are marked in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. According to specific needs, those skilled in the art can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. Detailed Implementation
[0034] The present invention provides an offline calibration device for an angle sensor, which is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.
[0035] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.
[0036] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.
[0037] As used herein, the term "nominal / nominally" refers to the expected or target value of a characteristic or parameter for the operation of a component or process, set during the design phase of the production or manufacturing process, and the range of values higher and / or lower than the expected value. The range of values may be due to slight variations in the manufacturing process or tolerances. As used herein, the term "about" indicates a value of a given quantity that can vary based on a specific technology node associated with the subject semiconductor device. Based on a specific technology node, the term "about" can indicate a value of a given quantity that varies, for example, within 5% to 15% of the value (e.g., ±5%, ±10%, or ±15% of the value).
[0038] It is understood that the meanings of “on”, “above” and “above” in this disclosure should be interpreted in the broadest sense, such that “on” means not only “directly on” something, but also includes something with an intermediary feature or layer, and that “above” or “above” means not only “on” something, but also includes something “above” or “above” without an intermediary feature or layer.
[0039] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.
[0040] like Figure 1-3 and Figure 7As shown, an embodiment of the present invention provides an angle sensor offline calibration device, including a fixed base 1. A top cover plate 9 is fixedly connected to the top of the fixed base 1. A test base 10 for supporting the angle sensor housing is fixedly connected to the top cover plate 9. An adapter shaft 3 for limiting the angle sensor shaft is sleeved inside the test base 10. A positioning component 30 for centering and limiting the angle sensor shaft is installed on the adapter shaft 3. A quick-grip gripper 12 for cooperating with the test base 10 to limit the angle sensor housing is installed on the test base 10. A stepper motor 2 for calibrating the angle sensor shaft in conjunction with the adapter shaft 3 and the positioning component 30 is fixedly connected inside the fixed base 1. The stepper motor 2, adapter shaft 3, and test base 10 are coaxial and vertically arranged. The adapter shaft 3 and... The output end of the stepper motor 2 is fixedly connected. The design of assembling and installing along the vertical and horizontal plane can avoid the influence of gravity on the concentricity of the system, improve the level of assembly concentricity, and reduce the calibration error of the angle sensor. The top of the adapter shaft 3 is provided with a first limiting hole 27, which is a square hole. Four third through holes 26 are evenly arranged around the circumference of the adapter shaft 3. The third through holes 26 are connected to the first limiting holes 27. The positioning component 30 includes a set screw 5 that is fixedly connected to the third through holes 26 by threads. A top pin 7 is slidably sleeved in the third through hole 26 and extends through and into the first limiting hole 27. A spring 6 is fixedly sleeved at the end of the top pin 7 away from the first limiting hole 27. The end of the spring 6 away from the top pin 7 abuts against the set screw 5.
[0041] Before calibration, the rotating shaft of the angle sensor to be tested is inserted into the first limiting hole 27. The set screw 5 abuts against one end of the spring 6, causing the spring 6 to push the top pin 7 along the axial direction of the third through hole 26 towards the side of the first limiting hole 27 under its own elastic force. The top pin 7 abuts against the square rotating shaft of the angle sensor to be tested, eliminating the clearance between the rotating shaft of the angle sensor to be tested and the shaft hole of the first limiting hole 27, avoiding eccentricity, and ensuring the concentricity requirement of the assembly. The adapter shaft 3 limits the housing of the angle sensor to be tested, and the quick clamp 12 limits the top of the angle sensor to be tested by vertical pressing and fastening. Compared with the traditional screw fixing or chuck fixing method, it can avoid the concentricity error caused by the precision deviation of the screw hole or chuck to the greatest extent, and improve the calibration accuracy.
[0042] By setting stepper motor 2 as the angle reference source, automated operation can be achieved, and the installation of a code disk or encoder as a reference can be saved. This can reduce assembly errors caused by too many adapters and improve the accuracy of calibration.
[0043] like Figure 7As shown, in this embodiment, the third through hole 26 is a countersunk hole, and a limiting ring 8 is fixedly sleeved on the top pin 7. The limiting ring 8 abuts against the inner wall of one side of the third through hole 26. The top pin 7 has a chamfer at one end located in the first limiting hole 27. Through the cooperation of the limiting ring 8 and the countersunk hole, the top pin 7 is prevented from moving to the first limiting hole 27 after being squeezed by the spring force of the spring 6, which would prevent the rotating shaft of the angle sensor to be measured from being properly inserted into the first limiting hole 27 and affect the calibration of the angle sensor to be measured. The chamfer on the top pin 7 guides the end of the rotating shaft of the angle sensor to be measured, preventing the end of the top pin 7 from interfering with the end of the rotating shaft of the angle sensor to be measured, and further improving the insertion efficiency of the rotating shaft of the angle sensor to be measured.
[0044] like Figure 1 and Figure 2 As shown, in this embodiment, multiple first limiting sleeves 20 are fixedly connected to the test base 10. The quick clamp 12 is fixedly connected to the quick clamp 12 through the first limiting sleeves 20. There can be four first limiting sleeves 20 to facilitate the fixation of the four corners of the quick clamp 12. The limiting height of the quick clamp 12 is increased by the first limiting sleeves 20 to ensure that the pressing end of the quick clamp 12 can press against the top of the housing of the angle sensor under test, thereby ensuring the calibration rate of the angle sensor under test.
[0045] like Figure 3-6 As shown, in this embodiment, the upper cover plate 9 has an eccentrically provided first mounting hole 18. The test seat 10 is fixedly connected to the upper cover plate 9 through the first mounting hole 18 and is fixedly connected to the first mounting hole 18 by bolts. The test seat 10 is fixedly connected to the top mounting hole of the stepper motor 2 by bolts, and the adapter shaft 3 is fixedly connected to the output end of the stepper motor 2 by bolts. The top of the adapter shaft 3 also has a second adapter groove 28 that communicates with the first limiting hole 27. The test seat 10 has a first limiting groove 19 that is adapted to the housing of the angle sensor. A connecting flange 22 is fixedly sleeved in the middle of the test seat 10. The connecting flange 22 is fixedly sleeved in the first mounting hole 18 and is fixedly fixed to the first mounting hole 18 by bolts, thus realizing the test seat. The relative position of the test base 10 and the first mounting hole 18 is fixed, the structure is simple and easy to operate. The bottom of the first limiting groove 19 is provided with a first through hole 21 that is adapted to the adapter shaft 3. The bottom of the test base 10 is provided with a first adapter groove 24 that is adapted to the positioning ring of the stepper motor 2. The positioning ring of the stepper motor 2 is limited by the first adapter groove 24 to improve the installation speed of the stepper motor 2 and the test base 10. The bottom of the test base 10 is provided with several process grooves 25 evenly arranged around the perimeter. As one embodiment of this embodiment, the process grooves 25 can be set to four to reduce the overall weight of the test base 10. At the same time, the straight edge of the process groove 25 can also be used as a positioning reference around the stepper motor 2, which can further improve the installation speed of the stepper motor 2 and the test base 10.
[0046] The upper cover plate 9 on the adapter shaft 3 limits the placement angle of the housing of the angle sensor under test, so as to cooperate with the quick clamp 12 to completely limit the housing of the angle sensor under test and prevent the angle sensor under test from moving during the calibration process. The stepper motor 2, adapter shaft 3, test base 10 and upper cover plate 9 are fixed by bolts. The structure is simple and easy to disassemble and maintain.
[0047] like Figure 1-4 and Figure 7 As shown, in this embodiment, a second through hole 23 communicating with the first through hole 21 is provided on one side of the test base 10. A proximity switch 11 is fixedly sleeved in the second through hole 23. A second limiting groove 29 coaxial with the second through hole 23 is provided on the adapter shaft 3. A magnet 4 is fixedly sleeved in the second limiting groove 29. A data interface 13, a display screen 15 and multiple buttons 14 are fixedly installed on the top of the upper cover plate 9. A motor driver 16 is fixedly installed in the fixed base 1. A control panel is fixedly connected to the side of the motor driver 16 away from the stepper motor 2. The stepper motor 2, data interface 13, buttons 14, display screen 15, motor driver 16 and control panel are electrically connected. The data interface 13 can be an RS232 interface in the prior art. Through the RS232 interface, operation data and other information can be output to a specific storage unit for easy storage. The display screen 15 facilitates data observation.
[0048] By setting the magnet 4 and the proximity switch 11, the stepper motor 2 can always rotate from a fixed starting point. Several calibration points can be preset according to the range and accuracy requirements. When calibrating the angle sensor to be measured, it can be operated by pressing the button 14, which is convenient and quick and improves the calibration speed of the staff.
[0049] like Figure 1 As shown, in this embodiment, the bottom of the fixed seat 1 is evenly arranged and fixedly connected with several support pads 17. The support pads 17 are made of rubber and are floor mats with adjustable support height in the prior art. This facilitates the support and leveling of the fixed seat 1, while maintaining a certain gap between the bottom of the fixed seat 1 and the ground, so that the fixed seat 1 can withstand force during transportation and improve the convenience of transportation.
[0050] like Figure 7 As shown, in this embodiment, the bottom of the adapter shaft 3 is provided with a relief groove 31 that is adapted to the output shaft of the stepper motor 2. The relief groove 31 is clearance-fitted with the output shaft of the stepper motor 2. By providing the relief groove 31 to accommodate the output shaft of the stepper motor 2, interference between the output shaft of the stepper motor 2 and the adapter shaft 3 is avoided when the stepper motor 2 and the adapter shaft 3 are assembled, thus preventing interference and affecting the normal installation of the stepper motor 2 and the adapter shaft 3.
[0051] The technical solution provided by this invention, through a coaxial and vertically arranged stepper motor, adapter shaft, and test base, can avoid the influence of gravity on the concentricity of the system, improve the level of assembly concentricity, reduce the calibration error of the angle sensor, and reduce the product defect rate.
[0052] Before calibration, the rotating shaft of the angle sensor to be tested is inserted into the first limiting hole. The set screw abuts against one end of the spring, causing the spring to push the top pin along the axial direction of the third through hole towards the side closer to the first limiting hole. The top pin abuts against the square rotating shaft of the angle sensor to be tested, eliminating the clearance between the rotating shaft of the angle sensor to be tested and the shaft hole of the first limiting hole, avoiding eccentricity, and ensuring the concentricity requirement of the assembly. The housing of the angle sensor to be tested is limited by the adapter shaft. The top of the angle sensor to be tested is limited by the vertical pressing and fastening method of the quick clamp. Compared with the traditional screw fixing or chuck fixing method, it can avoid the concentricity error caused by the precision deviation of the screw hole or chuck to the greatest extent, thus improving the calibration accuracy.
[0053] By setting a stepper motor as the angle reference source, automated operation can be achieved, and the installation of a code disk or encoder as a reference can be saved. This can reduce assembly errors caused by too many adapters and improve the accuracy of calibration.
[0054] The upper cover plate on the adapter shaft limits the placement angle of the housing of the angle sensor under test, and works with the quick clamp to completely limit the housing of the angle sensor under test, preventing the angle sensor under test from moving during the calibration process. The stepper motor, adapter shaft, test base and upper cover plate are fixed with bolts. The structure is simple and easy to disassemble and maintain.
[0055] By setting a magnet and a proximity switch, the stepper motor can always rotate from a fixed starting point. Several calibration points can be preset according to the range and accuracy requirements. When calibrating the angle sensor to be measured, it can be operated by pressing a button, which is convenient and quick, improves the calibration speed of the staff, and facilitates data observation through the display screen, reducing the error of reading parameters.
[0056] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.
[0057] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.
[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. An offline calibration device for an angle sensor, characterized in that, include: A fixed base is provided, with a top cover plate fixedly connected to the top of the fixed base. A test base for supporting the housing of an angle sensor is fixedly connected to the top cover plate. An adapter shaft for limiting the rotation of the angle sensor shaft is fitted inside the test base. A positioning component for centering and limiting the rotation of the angle sensor shaft is installed on the adapter shaft. A quick gripper for cooperating with the test base to limit the rotation of the angle sensor housing is installed on the test base. Multiple first limiting sleeves are fixedly connected to the test base, and the quick gripper is fixedly connected to the quick gripper through the first limiting sleeves. A stepper motor for calibrating the rotation of the angle sensor shaft in cooperation with the adapter shaft and the positioning component is fixedly connected inside the fixed base. The stepper motor, the adapter shaft, and the test base are coaxial and arranged vertically. The top of the adapter shaft is provided with a first limiting hole, which is a square hole. Four third through holes are evenly arranged around the circumference of the adapter shaft. The third through holes are connected to the first limiting holes. The positioning component includes a set screw that is fixedly connected to the third through hole by a thread. A top pin that passes through and extends into the first limiting hole is slidably sleeved in the third through hole. A spring is fixedly sleeved at the end of the top pin away from the first limiting hole. The end of the spring away from the top pin abuts against the set screw. Before calibration, the rotating shaft of the angle sensor to be tested is inserted into the first limiting hole. The set screw abuts against one end of the spring, causing the spring to push the top pin along the axial direction of the third through hole towards the side closer to the first limiting hole. The top pin abuts against the square rotating shaft of the angle sensor to be tested, eliminating the clearance between the rotating shaft of the angle sensor to be tested and the shaft hole of the first limiting hole. The adapter shaft limits the housing of the angle sensor to be tested. The top of the angle sensor to be tested is limited by a quick clamp that presses it vertically. The upper cover plate limits the placement angle of the housing of the angle sensor to be tested. This, together with the quick clamp, completely limits the housing of the angle sensor to be tested, preventing the angle sensor to be tested from moving during the calibration process.
2. The angle sensor offline calibration device according to claim 1, characterized in that, The third through hole is a countersunk hole, and a limiting ring is fixedly sleeved on the top pin. The limiting ring abuts against the inner wall of one side of the third through hole, and the end of the top pin located in the first limiting hole has a chamfer.
3. The angle sensor offline calibration device according to claim 1, characterized in that, The upper cover plate has an eccentric first mounting hole, and the test seat is fixedly connected to the upper cover plate through the first mounting hole.
4. The angle sensor offline calibration device according to claim 3, characterized in that, The test base is fixedly connected to the first mounting hole by bolts, the test base is fixedly connected to the top mounting hole of the stepper motor by bolts, and the adapter shaft is fixedly connected to the output end of the stepper motor by bolts.
5. The angle sensor offline calibration device according to claim 3, characterized in that, The test base has a first limiting groove adapted to the housing of the angle sensor. A connecting flange is fixedly sleeved in the middle of the test base. The connecting flange is fixedly sleeved with the first mounting hole. A first through hole adapted to the adapter shaft is opened at the bottom of the first limiting groove. A first adapter groove adapted to the stepper motor positioning ring is opened at the bottom of the test base. Several process grooves are evenly arranged around the bottom of the test base.
6. The angle sensor offline calibration device according to claim 1, characterized in that, The top of the adapter shaft is also provided with a second adapter groove that communicates with the first limiting hole.
7. The angle sensor offline calibration device according to claim 5, characterized in that, The test base has a second through hole on one side that communicates with the first through hole. A proximity switch is fixedly sleeved in the second through hole. A second limiting groove coaxial with the second through hole is opened on the adapter shaft. A magnet is fixedly sleeved in the second limiting groove. A data interface, a display screen and multiple buttons are fixedly installed on the top of the upper cover plate. A motor driver is fixedly installed in the fixed base. A control panel is fixedly connected to the side of the motor driver away from the stepper motor. The stepper motor, the data interface, the buttons, the display screen, the motor driver and the control panel are electrically connected.
8. The angle sensor offline calibration device according to claim 1, characterized in that, The bottom of the fixing base is evenly arranged with several support pads, which are made of rubber.
9. The angle sensor offline calibration device according to claim 1, characterized in that, The bottom of the adapter shaft is provided with a relief groove that is adapted to the output shaft of the stepper motor, and the relief groove is clearance-fitted with the output shaft of the stepper motor.