An elastic adaptive eddy current detection probe

Abstract

The utility model discloses a kind of elastic self-adapting eddy current detection probe, telescopic sleeve is set on multi-degree-of-freedom mechanism, and multi-degree-of-freedom mechanism is used to adjust the spatial pose of telescopic sleeve;Probe is located at the end of telescopic sleeve away from multi-degree-of-freedom mechanism, probe is connected with eddy current sensor by spherical hinge, it can rotate in set angle range around spherical hinge ball center, realize adaptive floating, axial floating structure and elastic element are equipped between telescopic sleeve and probe, axial floating structure allows telescopic sleeve and probe to occur relative axial motion, and elastic element is connected with telescopic sleeve and probe respectively.It makes probe can accurately stick to the surface of irregular workpiece by spherical hinge structure;Probe can be self-adapting telescopic by elastic element, protect that eddy current sensor will not be subjected to excessive pressure, also can make the detection surface of eddy current sensor stick to the surface of workpiece, multi-degree-of-freedom mechanism carries probe and carries out sliding detection along the edge of workpiece, improve the reliability and accuracy of detection result.

Description

Technical Field

[0001] This utility model relates to the field of in-situ eddy current detection technology, and in particular to an elastic adaptive eddy current detection probe. Background Technology

[0002] In-situ eddy current testing can quickly and effectively detect safety hazards in workpieces without affecting or altering their overall performance, which is of great significance. In practice, it has been found that due to confined spaces and varying curvature of the workpiece's outer surface in some scenarios, existing testing probes are prone to problems such as probes failing to maintain contact with the workpiece surface (which severely affects testing accuracy) or having a small testing area. Furthermore, existing probes make rigid contact with the testing surface, cannot adaptively extend or retract, are easily damaged, and cannot guarantee that the probe will remain firmly in contact with the workpiece surface throughout the testing process. Utility Model Content

[0003] The purpose of this invention is to provide an elastic adaptive eddy current detection probe to solve the existing technical defects and unmet technical requirements.

[0004] To achieve the above objectives, this utility model provides the following technical solution: An elastic adaptive eddy current detection probe, including A telescopic sleeve is mounted on a multi-degree-of-freedom mechanism, which is used to adjust the spatial orientation of the telescopic sleeve. The probe is located at the end of the telescopic sleeve away from the multi-degree-of-freedom mechanism. The probe is connected to an eddy current sensor via a ball joint. The eddy current sensor can rotate around the center of the ball joint within a set angle range to achieve adaptive floating. An axial floating structure and an elastic element are provided between the telescopic sleeve and the probe. The axial floating structure allows relative axial movement between the telescopic sleeve and the probe. The two ends of the elastic element are connected to the telescopic sleeve and the probe, respectively.

[0005] Preferably, the eddy current sensor is ball-jointed to the end face of the probe, and a limiting protrusion is provided on one side of the probe. The height of the limiting protrusion exceeds that of the eddy current sensor, so that the limiting protrusion abuts against the edge of the workpiece, and the detection surface of the eddy current sensor is in contact with the surface of the workpiece and slides along the edge of the workpiece for detection.

[0006] Preferably, the limiting protrusion has a camera for observation inside, and the limiting protrusion has an observation channel extending through it along the axial direction of the camera. The probe has a wiring channel through which wires electrically connected to the eddy current sensor pass.

[0007] Preferably, the axial floating structure is a protruding post extending from the probe toward the telescopic sleeve. The telescopic sleeve is fitted onto the protruding post. The protruding post has a through-hole along its axial direction. The eddy current sensor has a ball head. The end face of the probe has a spherical cavity for mounting the ball head. The probe has a through-hole channel for connecting the spherical cavity and the through-hole. The spherical cavity, the through-hole channel, and the through-hole form a wiring channel.

[0008] Preferably, the probe has a groove on its side, and the eddy current sensor is ball-jointed to the end face of the groove away from the telescopic sleeve. The groove allows the probe to hook onto the surface of the workpiece, and the detection surface of the eddy current sensor is in contact with the surface of the workpiece and slides along the edge of the workpiece for detection.

[0009] Preferably, the groove has a camera for observation on the end face opposite to the eddy current sensor, the camera is aimed at the eddy current sensor, and the probe has a wiring channel for the wires electrically connected to the eddy current sensor to pass through.

[0010] Preferably, the axial floating structure is a protruding post extending from the probe toward the telescopic sleeve. The telescopic sleeve is fitted onto the protruding post. The protruding post has a through-hole along its axial direction. The eddy current sensor has a ball head. The probe has a spherical cavity for mounting the ball head on the end face of the groove away from the telescopic sleeve. The probe has a through-hole for connecting the spherical cavity and the through-hole. The spherical cavity, the through-hole, and the through-hole form a wiring channel.

[0011] Preferably, the protruding post is provided with an anti-rotation structure to prevent the probe from rotating relative to the axis of the telescopic sleeve. The elastic element is a spring, one end of which is abutted against or fixedly connected to the probe, and the other end of which is abutted against or fixedly connected to the telescopic sleeve.

[0012] Preferably, the multi-degree-of-freedom mechanism includes an adjusting rod, a probe rod, and a second adjusting assembly. One end of the probe rod is hinged to the adjusting rod via a rotating shaft, and the other end of the probe rod is connected to a base. The second adjusting assembly is mounted on the base, and a telescopic sleeve is fitted over the adjusting rod. A groove is provided along the axial direction inside the adjusting rod. A slider is fixedly connected to the telescopic sleeve and placed inside the groove. A third pull rope is fixedly connected to the slider. Multiple sets of guide structures are provided inside the groove. The two ends of the third pull rope pass through the hollow probe rod after bypassing the multiple sets of guide structures, and the two ends of the third pull rope are connected to the second adjusting assembly. The second adjusting assembly controls the movement of the two ends of the third pull rope, thereby controlling the position of the slider inside the groove.

[0013] Preferably, the multi-degree-of-freedom mechanism further includes a first adjustment component, a first pull rope, and a second pull rope. The first adjustment component is mounted on the base. The heads of the first and second pull ropes pass through the hollow probe and are connected to both ends of the adjustment rod. The ends of the first and second pull ropes are connected to the first adjustment component. The first adjustment component controls the first and second pull ropes to be pulled or released, thereby controlling the adjustment rod to rotate around the rotation axis.

[0014] The beneficial effects of this utility model are as follows: The probe of this invention is retractable and housed within a telescopic sleeve. Through a ball joint structure, the probe angle can be adaptively adjusted, allowing the probe to accurately adhere to the irregular surface of the workpiece. The elastic element enables the probe to extend and retract adaptively, protecting the eddy current sensor from excessive pressure and ensuring that the detection surface of the eddy current sensor adheres to the surface of the workpiece. The multi-degree-of-freedom mechanism guides the probe to slide along the edges of the workpiece for detection, improving the reliability and accuracy of the detection results.

[0015] The multi-degree-of-freedom mechanism of this utility model controls the adjustment rod to rotate at a certain angle through the first adjustment component, thereby adjusting the angle of the probe so that the included angle between the probe and the edge of the workpiece to be inspected is close to perpendicular, creating conditions for subsequent surface contact during inspection; the telescopic sleeve is controlled to move along the axial direction of the adjustment rod through the second adjustment component, thereby adjusting the position of the probe in the axial direction of the adjustment rod, thus adapting to the needs of different measurement distances.

[0016] When the overall structure is fully retracted, the probe, telescopic sleeve, adjusting rod, and probe rod will become a slender rod-shaped structure that can be inserted into the inner cavity of the equipment through the narrow detection hole. The probe performs eddy current detection on the surface of the workpiece in the inner cavity without disassembling the overall structure of the equipment, thus achieving rapid in-situ detection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Example 1; Figure 2 This is a schematic diagram of the working state of Example 1; Figure 3 This is a schematic diagram of the telescopic sleeve, probe, and eddy current sensor in Example 1. Figure 4 This is a schematic diagram of the probe and eddy current sensor in Example 1; Figure 5 This is an exploded structural diagram of the probe and eddy current sensor of Example 1; Figure 6 This is a schematic diagram of the overall structure of the multi-degree-of-freedom mechanism in Example 1; Figure 7 This is an exploded structural diagram of the telescopic sleeve, adjusting rod, and second adjusting assembly of Embodiment 1; Figure 8 This is a schematic diagram of the internal structure of the telescopic sleeve, adjusting rod, and second adjusting assembly in Example 1. Figure 9 This is a schematic diagram of the structure of the first and second adjustment components in Embodiment 1; Figure 10 This is a schematic diagram of the replacement scheme using manual control in Example 1; Figure 11 This is a schematic diagram of the structure of Example 2; Figure 12 This is a schematic diagram of the working state of Example 2. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0019] like Figures 1-10 As shown, an elastic adaptive eddy current detection probe includes a telescopic sleeve 3, which is mounted on a multi-degree-of-freedom mechanism I, used to adjust the spatial orientation of the telescopic sleeve 3; a probe 4, located at the end of the telescopic sleeve 3 away from the multi-degree-of-freedom mechanism, with an eddy current sensor 401 connected to the probe 4 via a ball joint. The eddy current sensor 401 can rotate around the center of the ball joint within a set angle range to achieve adaptive floating. An axial floating structure and an elastic element are provided between the telescopic sleeve 3 and the probe 4. The axial floating structure allows relative axial movement between the telescopic sleeve 3 and the probe 4, and the two ends of the elastic element are connected to the telescopic sleeve 3 and the probe, respectively.

[0020] like Figures 1-3 As shown, the eddy current sensor 401 is ball-jointed to the end face of the probe 4. A limiting protrusion 402 is provided on one side of the probe 4. The height of the limiting protrusion 402 exceeds that of the eddy current sensor 401, so that the limiting protrusion 402 abuts against the edge of the workpiece 100, and the detection surface of the eddy current sensor 401 is attached to the surface of the workpiece 100 and slides along the edge of the workpiece 100 for detection.

[0021] The limiting protrusion 402 is equipped with a camera 403 for observation. The limiting protrusion 402 has an observation channel that runs through the camera 403 along its axial direction. The probe 4 is equipped with a wiring channel through which wires electrically connected to the eddy current sensor 401 pass.

[0022] like Figure 4 and Figure 5 As shown, the axial floating structure is a protruding post 405 extending from the probe 4 toward the telescopic sleeve 3. The telescopic sleeve 3 is sleeved on the protruding post 405. The protruding post 405 has a through-hole 406 along its axial direction. The eddy current sensor 401 is provided with a ball head 4011. The end face of the probe 4 is provided with a spherical cavity 4012 for mounting the ball head 4011. The probe 4 is provided with a wire passage 407 for connecting the spherical cavity 4012 and the wire passage 406. The spherical cavity, the wire passage and the wire passage form a wire routing channel.

[0023] The protruding post 405 is provided with an anti-rotation structure to prevent the probe 4 from rotating relative to the axis of the telescopic sleeve 3. In this embodiment, the anti-rotation structure adopts a pin groove structure, wherein the pin groove structure includes a pin shaft and a pin groove. The pin groove is opened on the protruding post 405 along the axial direction of the protruding post 405. The pin shaft passes through the pin groove and its two ends are tightly fitted and inserted into the telescopic sleeve 3. The pin shaft and the pin groove realize the guiding telescopic cooperation between the probe 4 and the telescopic sleeve 3. The elastic element is a spring 11. One end of the spring 11 is abutted or fixedly connected to the probe 4, and the other end of the spring 11 is abutted or fixedly connected to the telescopic sleeve 3.

[0024] In this embodiment, one end of the spring 11 abuts against the probe 4, and the other end of the spring 11 abuts against the telescopic sleeve 3. When the probe 4 contacts the workpiece to be tested, the spring 11 is compressed to protect the eddy current sensor from excessive pressure. At the same time, when the multi-degree-of-freedom mechanism I drives the probe 4 to slide along the edge of the workpiece to be tested, the spring 11 always exerts a certain pushing force on the probe 4 through its own elasticity, so that the detection surface of the eddy current sensor is always pressed against the surface of the workpiece to be tested, realizing the elastic adaptive extension and retraction of the probe 4, which greatly improves the accuracy of the detection.

[0025] like Figure 6 As shown, the multi-degree-of-freedom mechanism I includes an adjusting rod 2, a probe rod 1, and a second adjusting component 7. One end of the probe rod 1 is hinged to the adjusting rod 2 via a rotating shaft 12, and the other end of the probe rod 1 is connected to a base 5. The second adjusting component 7 is mounted on the base 5 and controls the telescopic position of the telescopic sleeve 3 on the adjusting rod 2, thereby controlling the position of the probe 4 in the axial direction of the adjusting rod 2.

[0026] like Figure 7 and 8As shown, the telescopic sleeve 3 is fitted over the adjusting rod 2. The adjusting rod 2 has a groove 201 along its axial direction inside. The telescopic sleeve 3 is fixedly connected to a slider 202, which is placed within the groove 201. The second adjusting component 7 can drive the slider 202 to slide within the groove 201. A third pull rope 8 is fixedly connected to the slider 202. The groove 201 has multiple sets of guide structures, including guide posts and guide wheels, or a combination thereof. The two ends of the third pull rope 8 pass through the multiple sets of guide structures and then through the hollow probe 1. Both ends of the third pull rope 8 are connected to the second adjusting component 7. The second adjusting component 7 controls the movement of the two ends of the third pull rope 8, thus controlling the position of the slider 202 within the groove 201. The third pull rope 8 includes a first parallel section 801, which remains parallel to the axis of the adjusting rod 2 under the guidance of the multiple sets of guide structures. The slider 202 is fixedly connected to the first parallel section 801.

[0027] like Figure 6 and Figure 9 As shown, the second adjustment component 7 includes a winding wheel 701 rotatably mounted on the base 5. Both ends of the third pull rope 8 are wound around the winding wheel 701 in the same helical direction. When the winding wheel 701 rotates in the forward direction, one end of the third pull rope 8 is wound around the winding wheel 701, and the other end is released from the winding wheel 701. When the winding wheel 701 rotates in the reverse direction, one end of the third pull rope 8 is released from the winding wheel 701, and the other end is wound around the winding wheel 701. The rotation of the winding wheel 701 is controlled automatically or manually. Specifically, the winding wheel 701 is controlled to rotate automatically, including a second drive motor 702. The second drive motor 702 is fixedly mounted on the base 5. The winding wheel 701 is coaxially and fixedly connected to the output shaft of the second drive motor 702, and the winding wheel 701 is driven to rotate by the second drive motor 702.

[0028] As an alternative, the winding reel 701 uses manual rotation to control its rotation, specifically as follows: Figure 10 As shown, the winding wheel 701 is equipped with a rotating handle 7011, and the operator drives the winding wheel 701 to rotate forward and backward by rotating the handle 7011.

[0029] like Figure 9As shown, the multi-degree-of-freedom mechanism I further includes a first adjustment component 6, a first pull rope 9, and a second pull rope 10. The first adjustment component is mounted on the base 5. The heads of the first pull rope 9 and the second pull rope 10 pass through the hollow probe 1 and are connected to both ends of the adjustment rod 2. The ends of the first pull rope 9 and the second pull rope 10 are connected to the first adjustment component 6. The first adjustment component 6 controls the first pull rope 9 and the second pull rope 10 to pull or release, thereby controlling the adjustment rod 2 to rotate around the rotation axis 12.

[0030] The first adjustment component 6 includes two sets of linear motion mechanisms. The moving ends of the two linear motion mechanisms are respectively connected to the ends of the first pull rope 9 and the second pull rope 10. The two linear motion mechanisms are controlled to move their moving ends automatically or manually.

[0031] Specifically, the two linear motion mechanisms are automatically controlled to move their moving ends. The linear motion mechanism is a threaded rod 601 threadedly mounted on the mounting block 605. One end of the two threaded rods 601 is circumferentially connected to the first pull rope 9 and the second pull rope 10, respectively. This circumferential rotatable connection adopts a bearing ring structure to prevent the threaded rod 601 from causing the first pull rope 9 and the second pull rope 10 to coil when rotating. The other end of the threaded rod 601 is fixedly connected to the output shaft of the first drive motor 602. The base 5 is provided with two guide rails 603. The two first drive motors 602 are slidably mounted on the corresponding guide rails 603. The first drive motors 602 drive the threaded rod 601 to rotate forward and backward, causing the threaded rod 601 to move back and forth on the mounting block, thereby pulling or releasing the first pull rope 9 or the second pull rope 10 to control the rotation angle of the adjusting rod 2. When the threaded rod 601 moves, the threaded rod 601 will drive the first drive motor 602 to move on the guide rail 603. Alternatively, the two linear motion mechanisms can be replaced by linear motion modules, electric actuators, hydraulic actuators, or pneumatic actuators.

[0032] As an alternative, the two linear motion mechanisms are manually controlled to move their motion ends, specifically as follows: Figure 10 As shown, a knob 604 is fixedly connected to the end of the threaded rod 601. The operator controls the forward and reverse rotation of the threaded rod 601 by rotating the knob 604, thereby pulling or releasing the first pull rope 9 or the second pull rope 10. Example 2

[0033] This embodiment refers to the working principle of embodiment 1, with the following differences: like Figure 11 and Figure 12As shown, the probe has a second groove 408 on its side. The eddy current sensor 401 is ball-jointed to the end face of the second groove 408 away from the telescopic sleeve. The probe can hook onto the surface of the workpiece 100 through the second groove 408, and the detection surface of the eddy current sensor 401 is attached to the surface of the workpiece 100 and slides along the edge of the workpiece 100 for detection.

[0034] The second groove 408 has a camera 403 for observation on the end face opposite to the eddy current sensor 401. The camera 403 is aligned with the eddy current sensor 401. The probe has a wiring channel for the wires that are electrically connected to the eddy current sensor 401 to pass through.

[0035] The axial floating structure is a protruding post extending from the probe toward the telescopic sleeve. The telescopic sleeve is fitted onto the protruding post. The protruding post has a through-hole along its axial direction. The eddy current sensor has a ball head. The probe has a spherical cavity for mounting the ball head on the end face of the groove away from the telescopic sleeve. The probe has a through-hole for connecting the spherical cavity and the through-hole. The spherical cavity, the through-hole, and the through-hole form a wiring channel.

[0036] The protruding post is provided with an anti-rotation structure to prevent the probe from rotating relative to the axis of the telescopic sleeve. The elastic element is a spring, with one end of the spring fixedly connected to the probe and the other end of the spring fixedly connected to the telescopic sleeve. The anti-rotation structure can refer to the structure in Embodiment 1.

[0037] Specifically, in this embodiment, one end of the spring 11 is fixedly connected to the probe 4, and the other end of the spring 11 is fixedly connected to the telescopic sleeve 3. When the probe 4 hooks onto the surface of the workpiece to be tested through the groove, the spring 11 is stretched to protect the eddy current sensor from excessive pressure. At the same time, when the multi-degree-of-freedom mechanism I drives the probe 4 to slide along the edge of the workpiece to be tested, the spring 11 always exerts a certain pulling force on the probe 4 through its own elasticity, so that the detection surface of the eddy current sensor is always pressed against the surface of the workpiece to be tested, realizing the elastic adaptive extension and retraction of the probe 4, which greatly improves the accuracy of the detection.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An elastic adaptive eddy current detection probe, characterized in that, include A telescopic sleeve is mounted on a multi-degree-of-freedom mechanism, which is used to adjust the spatial orientation of the telescopic sleeve. The probe is located at the end of the telescopic sleeve away from the multi-degree-of-freedom mechanism. The probe is connected to an eddy current sensor via a ball joint. The eddy current sensor can rotate around the center of the ball joint within a set angle range to achieve adaptive floating. An axial floating structure and an elastic element are provided between the telescopic sleeve and the probe. The axial floating structure allows relative axial movement between the telescopic sleeve and the probe. The two ends of the elastic element are connected to the telescopic sleeve and the probe, respectively.

2. The elastic adaptive eddy current detection probe according to claim 1, characterized in that, The eddy current sensor is ball-jointed to the end face of the probe. A limiting protrusion is provided on one side of the probe. The height of the limiting protrusion exceeds that of the eddy current sensor, so that the limiting protrusion abuts against the edge of the workpiece, and the detection surface of the eddy current sensor is in contact with the surface of the workpiece and slides along the edge of the workpiece for detection.

3. The elastic adaptive eddy current detection probe according to claim 2, characterized in that, The limiting protrusion has a camera inside for observation, and an observation channel is provided through the limiting protrusion along the axis of the camera. The probe has a wiring channel for the wires that are electrically connected to the eddy current sensor to pass through.

4. The elastic adaptive eddy current detection probe according to claim 3, characterized in that, The axial floating structure is a protruding post extending from the probe toward the telescopic sleeve. The telescopic sleeve is fitted onto the protruding post. The protruding post has a through-hole along its axial direction. The eddy current sensor has a ball head. The end face of the probe has a spherical cavity for mounting the ball head. The probe has a through-hole channel for connecting the spherical cavity and the through-hole. The spherical cavity, the through-hole channel, and the through-hole together form a wiring channel.

5. The elastic adaptive eddy current detection probe according to claim 1, characterized in that, The probe has a groove on its side, and the eddy current sensor is connected to the end face of the groove away from the telescopic sleeve by a ball joint. The probe can hook onto the surface of the workpiece through the groove, and the detection surface of the eddy current sensor is in contact with the surface of the workpiece and slides along the edge of the workpiece to perform detection.

6. The elastic adaptive eddy current detection probe according to claim 5, characterized in that, The groove has a camera for observation on the end face opposite to the eddy current sensor. The camera is aimed at the eddy current sensor, and the probe has a wiring channel for the wires that are electrically connected to the eddy current sensor to pass through.

7. The elastic adaptive eddy current detection probe according to claim 6, characterized in that, The axial floating structure is a protruding post extending from the probe toward the telescopic sleeve. The telescopic sleeve is fitted onto the protruding post. The protruding post has a through-hole along its axial direction. The eddy current sensor has a ball head. The probe has a spherical cavity for mounting the ball head on the end face of the groove away from the telescopic sleeve. The probe has a through-hole for connecting the spherical cavity and the through-hole. The spherical cavity, the through-hole, and the through-hole form a wiring channel.

8. An elastic adaptive eddy current detection probe according to claim 4 or 7, characterized in that, The protruding post is provided with an anti-rotation structure to prevent the probe from rotating relative to the axis of the telescopic sleeve. The elastic element is a spring, one end of which is abutted against or fixedly connected to the probe, and the other end of which is abutted against or fixedly connected to the telescopic sleeve.

9. The elastic adaptive eddy current detection probe according to claim 1, characterized in that, The multi-degree-of-freedom mechanism includes an adjusting rod, a probe, and a second adjusting assembly. One end of the probe is hinged to the adjusting rod via a rotating shaft, and the other end of the probe is connected to a base. The second adjusting assembly is mounted on the base, and a telescopic sleeve is fitted over the adjusting rod. A groove is provided along the axial direction inside the adjusting rod. A slider is fixedly connected to the telescopic sleeve and placed inside the groove. A third pull rope is fixedly connected to the slider. Multiple sets of guide structures are provided inside the groove. The two ends of the third pull rope pass through the hollow probe after bypassing the multiple sets of guide structures, and the two ends of the third pull rope are connected to the second adjusting assembly. The second adjusting assembly controls the movement of the two ends of the third pull rope, thereby controlling the position of the slider within the groove.

10. The elastic adaptive eddy current detection probe according to claim 9, characterized in that, The multi-degree-of-freedom mechanism further includes a first adjustment component, a first pull rope, and a second pull rope. The first adjustment component is mounted on the base. The heads of the first and second pull ropes pass through the hollow probe and are connected to both ends of the adjustment rod. The ends of the first and second pull ropes are connected to the first adjustment component. The first adjustment component controls the first and second pull ropes to be pulled or released, thereby controlling the adjustment rod to rotate around the rotation axis.

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