An automatic tuning device and an automatic tuning method

Abstract

The application discloses an automatic calibration device and an automatic calibration method. The automatic calibration device comprises a verification head, a first driving assembly, a second driving assembly, a detection unit and a marking assembly. The verification head is provided with an internal tooth structure for cooperating with a gear on a crank box. The first driving assembly is connected with the verification head and used for driving the verification head to rotate. The second driving assembly is connected with the first driving assembly and used for driving the first driving assembly and the verification head to reciprocate along a set direction. The detection unit is used for detecting the moving stroke of a moving contact in a circuit breaker. The marking assembly is arranged on the first driving assembly and used for drawing a line at a predetermined position of the crank box when the moving stroke of the moving contact in the circuit breaker reaches a set stroke. The application can improve the detection efficiency and the detection accuracy. Moreover, the marking assembly can draw a line at the predetermined position of the crank box when the moving stroke of the moving contact reaches the set stroke, so that the assembly efficiency is improved, and the reference state of the moving side of the circuit breaker can be accurately marked.

Description

Technical Field

[0001] This application relates to the field of disconnector manufacturing equipment technology, specifically to an automatic calibration device and automatic calibration method. Background Technology

[0002] A circuit breaker is a switching device capable of connecting, carrying, and disconnecting current under normal and fault conditions. After assembly, the moving contact on the moving side of the circuit breaker can be moved by the gears on the crank arm box, thereby enabling the connection and disconnection between the moving contact on the moving side and the stationary contact on the stationary side. During assembly, the moving side of the circuit breaker is generally assembled with the crank arm box first, and then both are assembled with the stationary side of the circuit breaker. After the moving side of the circuit breaker and the crank arm box are assembled, to avoid assembly problems that could cause the moving contact to malfunction, the assembly result is usually checked by turning the gears in the crank arm box.

[0003] In existing technologies, manual verification is typically performed by turning the gears on the crank arm box to move the moving contact in the moving side of the circuit breaker. The presence of jamming is judged by touch, and the travel distance of the moving contact is manually measured (this travel distance is a critical parameter directly related to whether the circuit breaker can reliably interrupt the fault current within a specified time, thus achieving effective protection of the power system). Due to the limitations of manual operation and the subjectivity of manual observation, the accuracy of measuring and judging the movement of the moving contact is poor, resulting in low detection efficiency and accuracy. Furthermore, in existing technologies, after completing the manual inspection, the assembled circuit breaker moving side and crank arm box are sent to the next assembly stage. The moving contact in the moving side of the circuit breaker needs to have its extension length adjusted in this next stage, affecting the overall assembly efficiency of the circuit breaker. Summary of the Invention

[0004] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides an automatic calibration device and an automatic calibration method.

[0005] To achieve the above objectives, this application adopts the following technical solution: an automatic calibration device, the automatic calibration device comprising:

[0006] The inspection head is equipped with an internal gear structure for engaging with the gears on the crank arm box;

[0007] A first driving component is connected to the verification head and is used to drive the verification head to rotate.

[0008] The second drive component is connected to the first drive component and is used to drive the first drive component and the verification head to reciprocate along a set direction.

[0009] A detection unit for detecting the travel of the moving contact in a circuit breaker; and,

[0010] A marker component, which is set on the first driving component;

[0011] The marking component is used to draw a line at a predetermined position on the crank arm box when the moving contact in the circuit breaker reaches a set travel distance.

[0012] The application of this application has the following beneficial effects: The first drive assembly and the verification head can be moved along a set direction by the second drive assembly until the verification head abuts against the gear on the crank arm box. Then, the verification head can be driven by the first drive assembly to rotate at a first set speed until the verification head meshes with the gear, thereby achieving automated meshing of the verification head and gear. Afterwards, the verification head can be driven by the first drive assembly to rotate at a second set speed. The movement stroke of the moving contact can be detected by the detection unit. When the movement stroke of the moving contact reaches the set stroke, the verification head is controlled to stop rotating. Finally, a line is drawn at a predetermined position on the crank arm box by the marking assembly. Through the above operations, automated detection of the assembly status of the circuit breaker's moving side and the crank arm box can be achieved. Compared with the manual verification operation in the prior art, this application can improve detection efficiency and accuracy. Furthermore, when the movement stroke of the moving contact reaches the set stroke, a line can be drawn at a predetermined position on the crank arm box by the marking assembly, and this state can be maintained to directly enter the next assembly stage. The crank arm can be directly installed at the gear, improving assembly efficiency while accurately marking the reference state of the circuit breaker's moving side.

[0013] Optionally, the marking component includes a driving unit and a marking pen driven by the driving unit to draw lines on the crank arm box.

[0014] Optionally, the driving unit includes a first linear driver and a second linear driver. The marker pen is disposed at the output end of the first linear driver and can reciprocate along the set direction under the drive of the first linear driver. The output end of the second linear driver is connected to the first linear driver and is used to drive the first linear driver and the marker pen to reciprocate along a predetermined direction, wherein the predetermined direction is perpendicular to the set direction.

[0015] Optionally, the marking assembly further includes a mounting base and a mounting bracket, wherein the second linear driver is fixedly mounted to the first driving assembly via the mounting base, and the marking pen is fixedly mounted to the output end of the first linear driver via the mounting bracket.

[0016] Optionally, the detection unit includes a laser sensor, the emitting end of which is aligned with the end of the moving contact of the circuit breaker.

[0017] Optionally, the first drive assembly includes a drive motor and a transmission mechanism driven by the drive motor, with the calibration head disposed on the transmission mechanism at one end away from the drive motor; the second drive assembly includes a slide table and a support seat moved by the slide table, with the first drive assembly disposed on the support seat.

[0018] Optionally, the transmission mechanism includes:

[0019] A limiting cylinder is disposed on the bearing seat;

[0020] A drive shaft, which is connected to the drive motor and extends into the limiting cylinder;

[0021] A drive shaft that extends into the limiting sleeve and spline-fits the drive shaft; and...

[0022] An elastic element is disposed between the drive shaft and the transmission shaft and applies pressure to the transmission shaft such that the transmission shaft tends to disengage from the limiting cylinder.

[0023] The limiting structure is provided between the limiting cylinder and the transmission shaft to prevent the transmission shaft from disengaging from the limiting cylinder, and the inspection head is located at the end of the transmission shaft that extends out of the limiting cylinder.

[0024] Optionally, a spline groove is provided at one end of the drive shaft that extends into the limiting cylinder, the drive shaft extends into the spline groove and is splined with the drive shaft, and the elastic element is a compression spring, the two ends of the compression spring abutting against the bottom wall of the spline groove and the end of the drive shaft, respectively.

[0025] Optionally, the first drive assembly further includes a torque sensor disposed between the output shaft of the drive motor and the transmission mechanism. The torque sensor is used to detect the torque difference when the calibration head is idling and when the calibration head drives the load to rotate.

[0026] Furthermore, this application also provides an automatic calibration method, implemented using an automatic calibration device as described in any of the above technical solutions, the automatic calibration method comprising the following steps:

[0027] S100: The first drive assembly and the calibration head are driven by the second drive assembly to move along a set direction until the calibration head abuts against the gear on the crank arm box;

[0028] S200: The first drive assembly drives the calibration head to rotate at a first set speed until the calibration head engages with the gear;

[0029] S300: The moving contact travel is detected by the detection unit, and the calibration head is driven by the first drive component to rotate at a second set speed until the moving contact travel reaches the set travel.

[0030] S400: Draw lines at predetermined positions on the crank arm box using the marking component.

[0031] The automatic calibration method provided in this application is similar to the reasoning process of the beneficial effects of the aforementioned automatic calibration device, and will not be repeated here.

[0032] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0033] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0034] Figure 1 This is a schematic diagram of the structure of an automatic calibration device provided in an embodiment of this application;

[0035] Figure 2 Schematic diagram of the application of the automatic calibration device Figure 1 ;

[0036] Figure 3 Schematic diagram of the application of the automatic calibration device Figure 2 ;

[0037] Figure 4 Schematic diagram of the application of the automatic calibration device Figure 3 ;

[0038] Figure 5 This is a schematic diagram of the marking component in the automatic calibration device;

[0039] Figure 6 An exploded view of the labeled components;

[0040] Figure 7 A schematic diagram showing the marked components on the crank arm box after lines have been drawn.

[0041] Figure 8 Exploded views of the first and second drive components;

[0042] Figure 9 This is an exploded view of the transmission mechanism;

[0043] Figure 10 This is a sectional view of the transmission mechanism.

[0044] The components include: 1. First drive assembly; 10. Drive motor; 11. Reducer; 12. Torque sensor; 13. Coupling; 14. Transmission mechanism; 140. Limiting cylinder; 1400. Limiting flange; 141. Drive shaft; 142. Transmission shaft; 1420. Spline groove; 1421. Limiting flange; 143. Elastic element; 2. Second drive assembly; 20. Slide table; 21. Bearing seat; 22. Limit switch; 3. Calibration head; 30. Internal gear structure; 4. Detection unit; 5. Marking assembly; 50. Marking pen; 51. First linear actuator; 52. Second linear actuator; 53. Mounting seat; 54. Mounting bracket; 55. Mounting plate; 56. Marking line; 6. Base; 60. Assembly table; 61. Base; 62. Extension frame; 7. Circuit breaker moving side; 70. Moving contact; 8. Crank arm box; 80. Gear. Detailed Implementation

[0045] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0046] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0047] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] This embodiment provides an automatic calibration device, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the automatic calibration device includes a calibration head 3, a first drive assembly 1, a second drive assembly 2, a detection unit 4, and a marking assembly 5. The calibration head 3 is equipped with an internal gear structure 30 for engaging with a gear 80 on the crank arm housing 8. The first drive assembly 1 is connected to the calibration head 3 and drives it to rotate. The second drive assembly 2 is connected to the first drive assembly 1 and drives both the first drive assembly 1 and the calibration head 3 to reciprocate along a predetermined direction. Thus, the second drive assembly 2 can drive the first drive assembly 1 and the calibration head 3 to move along the predetermined direction until the calibration head 3 abuts against the gear 80 on the crank arm housing 8. Then, the first drive assembly 1 can drive the calibration head 3 to rotate at a first predetermined speed until the calibration head 3 meshes with the gear 80, thereby achieving automated meshing between the calibration head 3 and the gear 80.

[0050] In this embodiment, the detection unit 4 is used to detect the travel distance of the moving contact 70 in the circuit breaker. It can drive the verification head 3 to rotate at a second set speed via the first drive assembly 1. The moving contact 70 is moved by the gear 80 meshing with the verification head 3. The detection unit 4 can detect the travel distance of the moving contact 70. When the travel distance of the moving contact 70 reaches the set distance, the verification head 3 is controlled to stop rotating. Through the above operation, automated detection of the assembly status of the moving side 7 and the crank arm box 8 of the circuit breaker can be achieved. Compared with the manual verification operation in the prior art, this application can improve detection efficiency and accuracy.

[0051] In this embodiment, the marking component 5 is disposed on the first drive component 1. The marking component 5 is used to draw a line at a predetermined position on the crank arm box 8 when the moving contact 70 in the circuit breaker reaches a set stroke. By marking the predetermined position on the crank arm box 8 with the marking component 5 and maintaining this state to directly enter the next assembly stage, the crank arm can be directly installed at the gear 80, improving assembly efficiency while also accurately marking the reference state of the moving side 7 of the circuit breaker.

[0052] Combination Figure 5 and Figure 6As shown, the marking component 5 in this embodiment includes a driving unit and a marking pen 50 driven by the driving unit. The driving unit is used to drive the marking pen 50 to draw lines on the crank arm box 8. Specifically, the driving unit in this embodiment includes a first linear driver 51 and a second linear driver 52. The marking pen 50 is disposed at the output end of the first linear driver 51 and can reciprocate along a set direction under the drive of the first linear driver 51. The output end of the second linear driver 52 is connected to the first linear driver 51 and is used to drive the first linear driver 51 and the marking pen 50 to reciprocate along a predetermined direction, which is perpendicular to the set direction. By setting the first linear driver 51 to drive the marking pen 50 to move along the set direction, the marking pen 50 can be driven to move away from the gear 80 before the connector meshes with the gear 80, ensuring that the marking pen 50 does not interfere with the end face structure of the crank arm box 8; it can also be driven to move closer to the gear 80 after the moving contact 70 moves to the set stroke, so that the marking pen 50 can contact the end face of the crank arm box 8, so that lines can be drawn on the crank arm box 8. By setting the second linear driver 52, the marker pen 50 can be moved in a predetermined direction to complete the line drawing action.

[0053] Furthermore, the marking component 5 in this embodiment also includes a mounting base 53 and a mounting bracket 54. The second linear driver 52 is fixedly mounted to the first drive component 1 via the mounting base 53, and the marking pen 50 is fixedly mounted to the output end of the first linear driver 51 via the mounting bracket 54. Specifically, the mounting base 53 in this embodiment is a clamp, and the first drive component 1 includes a shaft structure for driving the coupling joint. The mounting base 53 is sleeved and fixed outside the aforementioned shaft structure, so that the marking component 5 is mounted on the first drive component 1 via the mounting base 53 and can move and rotate synchronously with the coupling joint. In addition, in this embodiment, a mounting plate 55 is also provided at the output end of the second linear driver 52, and the first linear driver 51 is fixedly mounted on the mounting plate 55.

[0054] Combination Figures 1 to 7 As shown, the automatic calibration method using the automatic calibration device provided in this embodiment will be described. The automatic calibration method includes the following steps:

[0055] Step S100: Drive the first drive assembly 1 and the calibration head 3 along the set direction by the second drive assembly 2 so that the calibration head 3 abuts against the gear 80 on the crank arm box 8;

[0056] Step S200: The first drive assembly 1 drives the calibration head 3 to rotate at a first set speed until the calibration head 3 meshes with the gear 80, thus obtaining... Figure 3 The state shown;

[0057] Step S300: The movement stroke of the moving contact 70 is detected by the detection unit 4, and the first drive assembly 1 drives the calibration head 3 to rotate at a second set speed until the movement stroke of the moving contact 70 reaches the set stroke, thus obtaining... Figure 4 The state shown;

[0058] Step S400: Draw a line at a predetermined position on the crank arm box 8 using the marking component 5 to obtain... Figure 7 The state shown is marked with line 56 on the crank arm box 8.

[0059] It should be noted that the first set rotational speed described in this embodiment is a selected value between 0.5 r / min and 2.5 r / min. It is easy to understand that the first set rotational speed is a relatively small value to ensure that the calibration head 3 can smoothly mesh with the gear 80. The second set rotational speed does not need to be particularly limited, as long as it allows the moving contact 70 to move at a speed approximately equal to the actual moving speed under working conditions.

[0060] The detection unit 4 in this embodiment includes a laser sensor, the emitting end of which is aligned with the end of the moving contact 70 of the circuit breaker. The laser sensor can accurately measure the extension and retraction stroke of the circuit breaker.

[0061] Combination Figure 8 , Figure 9 and Figure 10 As shown, the first drive assembly 1 in this embodiment includes a drive motor 10 and a transmission mechanism 14 driven by the drive motor 10. The calibration head 3 is disposed on the transmission mechanism 14 at the end away from the drive motor 10. With this structural design, the power of the drive motor 10 can be transmitted to the calibration head 3 through the transmission mechanism 14, causing the calibration head 3 to rotate. The second drive assembly 2 in this embodiment includes a slide 20 and a support base 21 driven by the slide 20. The first drive assembly 1 is disposed on the support base 21. Combined with... Figure 1 and Figure 2 As shown, before using the automatic calibration device provided in this embodiment, the circuit breaker moving side 7 and the crank arm box 8 are first assembled using assembly equipment. After the circuit breaker moving side 7 and the crank arm box 8 are assembled, the automatic calibration device is used for calibration. The assembly equipment includes a base 6, which includes an assembly table 60, a base 61, and an extension frame 62. The circuit breaker moving side 7 and the crank arm box 8 are assembled on the assembly table 60. The detection unit 4 is disposed on the base 61, and the bearing seat 21 is disposed on the extension frame 62.

[0062] In this embodiment, the slide 20 is an electric slide 20, which can be controlled by turning the power on and off. In order to accurately control the movement stroke of the support 21, a limit switch 22 is also provided on the extension frame 62 in this embodiment. When the support 21 moves to contact the limit switch 22, a control signal can be fed back to the electric slide 20 and the electric slide 20 can be stopped.

[0063] Furthermore, the transmission mechanism 14 in this embodiment includes a limiting cylinder 140, a drive shaft 141, a transmission shaft 142, and an elastic element 143. The limiting cylinder 140 is disposed on the support base 21. The drive shaft 141 is connected to the drive motor 10 and extends into the limiting cylinder 140. The transmission shaft 142 extends into the limiting cylinder 140 and is splinedly engaged with the drive shaft 141. This splined engagement allows the transmission shaft 142 to not only rotate under the drive of the drive shaft 141 but also to move axially relative to the drive shaft 141. The elastic element 143 is disposed between the drive shaft 141 and the transmission shaft 142 and applies pressure to the transmission shaft 142 to induce a tendency for the transmission shaft 142 to disengage from the limiting cylinder 140. A limiting structure is provided between the limiting cylinder 140 and the transmission shaft 142 to prevent the transmission shaft 142 from disengaging from the limiting cylinder 140. The inspection head 3 is disposed at the end of the transmission shaft 142 extending out of the limiting cylinder 140.

[0064] It is easy to understand that when the inspection head 3 rotates to the point where the teeth in its internal gear structure 30 are misaligned with the teeth in the gear 80, the second drive assembly 2 can apply a thrust to the inspection head 3 to move it until it engages with the gear 80. However, the magnitude of this thrust is difficult to control and may cause impact damage between the inspection head 3 and the gear 80. In this embodiment, the transmission mechanism 14 is further designed so that it can not only transmit the rotational torque of the drive motor 10 to the inspection head 3, but also prevent impact damage between the inspection head 3 and the gear 80 through its internal elastic element 143. Specifically, when the second drive assembly 2 drives the inspection head 3 to move to abut against the gear 80, the elastic element 143 can further compress to prevent a rigid impact between the inspection head 3 and the gear 80. Then, when the inspection head 3 rotates to the point where it can engage with the gear 80, the elastic element 143 can apply pressure to the inspection head 3 to complete the engagement between the inspection head 3 and the gear 80.

[0065] like Figure 9 and Figure 10 As shown, the limiting structure in this embodiment includes a limiting flange 1400 and a limiting edge 1421. The limiting flange 1400 is disposed on the inner wall of the limiting cylinder 140, and the limiting edge 1421 is disposed at the edge of the transmission shaft 142. The limiting edge 1421 and the limiting flange 1400 abut against each other before the inspection head 3 abuts against the gear 80 to prevent the transmission shaft 142 from separating from the drive shaft 141.

[0066] In addition, in this embodiment, the end of the drive shaft 142 that extends into the limiting cylinder 140 is provided with a spline groove 1420, and the drive shaft 141 extends into the spline groove 1420 and is splinedly engaged with the drive shaft 142. The elastic element 143 is a compression spring, and the two ends of the compression spring abut against the bottom wall of the spline groove 1420 and the end of the drive shaft 141, respectively. Optionally, a positioning protrusion can also be provided at the end of the drive shaft 141, and one end of the compression spring can be sleeved over the positioning protrusion to improve the stability of the compression spring and prevent the compression spring from shaking.

[0067] In this embodiment, the first drive assembly 1 further includes a torque sensor 12 disposed between the output shaft of the drive motor 10 and the transmission mechanism 14. The torque sensor 12 is used to detect the torque difference between the oscillating head 3 and the oscillating head 3 driving the load to rotate. This torque difference can be used to determine whether the connection between the moving side 7 of the circuit breaker and the crank arm box 8 is qualified. Specifically, the torque difference between the oscillating head 3 and the oscillating head 3 driving the load to rotate can characterize the torque value required to drive the gear 80 to rotate. If this torque value is too large, it indicates that there is a jam in the transmission between the gear 80 and the moving contact 70.

[0068] like Figure 8 As shown, in this embodiment, a reducer 11 is provided at the output end of the drive motor 10, and a torque sensor 12 is provided between the reducer 11 and the transmission mechanism 14. The reducer 11 allows for more precise control of speed and torque. Couplings 13 are provided on both sides of the torque sensor 12 for connection. Specifically, connecting shafts are provided on both sides of the torque sensor 12. One connecting shaft is connected to the output shaft of the reducer 11 via a corresponding coupling 13, and the other connecting shaft is connected to the drive shaft 141 via a corresponding coupling 13.

[0069] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. An automatic calibration device, characterized in that, The automatic calibration device includes: The inspection head is equipped with an internal gear structure for engaging with the gears on the crank arm box; A first driving component is connected to the verification head and is used to drive the verification head to rotate. The second drive component is connected to the first drive component and is used to drive the first drive component and the verification head to reciprocate along a set direction. A detection unit for detecting the travel of the moving contact in a circuit breaker; and, A marker component, which is set on the first driving component; The marking component is used to draw a line at a predetermined position on the crank arm box when the moving contact in the circuit breaker reaches a set travel distance. The first drive assembly includes a drive motor and a transmission mechanism driven by the drive motor, and the calibration head is disposed on the transmission mechanism at the end away from the drive motor; The second drive assembly includes a slide table and a support seat that is moved by the slide table, and the first drive assembly is disposed on the support seat; The transmission mechanism includes: A limiting cylinder is disposed on the bearing seat; A drive shaft, which is connected to the drive motor and extends into the limiting cylinder; A drive shaft that extends into the limiting sleeve and spline-fits the drive shaft; and... An elastic element is disposed between the drive shaft and the transmission shaft and applies pressure to the transmission shaft such that the transmission shaft tends to disengage from the limiting cylinder. The limiting structure is provided between the limiting cylinder and the transmission shaft to prevent the transmission shaft from disengaging from the limiting cylinder, and the inspection head is located at the end of the transmission shaft that extends out of the limiting cylinder.

2. The automatic calibration device as described in claim 1, characterized in that, The marking assembly includes a driving unit and a marking pen driven by the driving unit to draw lines on the crank arm box.

3. The automatic calibration device as described in claim 2, characterized in that, The driving unit includes a first linear driver and a second linear driver. The marker pen is disposed at the output end of the first linear driver and can reciprocate along the set direction under the drive of the first linear driver. The output of the second linear driver is connected to the first linear driver and is used to drive the first linear driver and the marker pen to reciprocate along a predetermined direction, which is perpendicular to the set direction.

4. The automatic calibration device as described in claim 3, characterized in that, The marking assembly further includes a mounting base and a mounting bracket. The second linear driver is fixedly mounted to the first driving assembly via the mounting base, and the marking pen is fixedly mounted to the output end of the first linear driver via the mounting bracket.

5. The automatic calibration device as described in any one of claims 1 to 4, characterized in that, The detection unit includes a laser sensor, the emitting end of which is aligned with the end of the moving contact of the circuit breaker.

6. The automatic calibration device as described in claim 1, characterized in that, The drive shaft has a spline groove at one end that extends into the limiting cylinder. The drive shaft extends into the spline groove and is splined with the drive shaft. The elastic element is a compression spring, and the two ends of the compression spring abut against the bottom wall of the spline groove and the end of the drive shaft, respectively.

7. The automatic calibration device as described in claim 1, characterized in that, The first drive assembly also includes a torque sensor disposed between the output shaft of the drive motor and the transmission mechanism. The torque sensor is used to detect the torque difference when the calibration head is idling and when the calibration head drives the load to rotate.

8. An automatic calibration method, implemented using the automatic calibration device as described in any one of claims 1 to 7, characterized in that, The automatic calibration method includes the following steps: S100: The first drive assembly and the calibration head are driven by the second drive assembly to move along a set direction until the calibration head abuts against the gear on the crank arm box; S200: The first drive assembly drives the calibration head to rotate at a first set speed until the calibration head meshes with the gear; S300: The moving contact travel is detected by the detection unit, and the calibration head is driven by the first drive component to rotate at a second set speed until the moving contact travel reaches the set travel. S400: Draw lines at predetermined positions on the crank arm box using the marking component.

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