Mirror adjustment device

Abstract

The application relates to the technical field of optical devices, in particular to a mirror adjusting device which comprises a rack, an adjusting assembly rotatably connected to the rack and used for carrying a mirror, the adjusting assembly having two rotation degrees of freedom, the two rotation axes of the adjusting assembly intersecting a first plane, a driving assembly movably connected to the rack, an output end of the driving assembly being movably connected with the adjusting assembly, the driving assembly driving the adjusting assembly to rotate in a centering mode, the center of the mirror overlapping the rotation center of the adjusting assembly, the driving assembly of the application controls the adjusting assembly to rotate in the centering mode, so that the center of the mirror rotates in the centering mode, the center point is kept in the same position, the accuracy and stability of the reflection angle adjustment are ensured, the influence of slight deviation on the propagation path of the laser beam is reduced, the accurate adjustment of the reflection angle of the laser beam is realized by ensuring the constant position of the center point of the mirror in the rotating process, and the demand of high-precision optical application is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical devices, and in particular to a mirror adjusting device. BACKGROUND

[0002] In the field of laser technology and application, mirror reflection is a crucial link. Mirror reflection refers to the reflection of light from a smooth surface (such as a mirror), so that the reflected light remains parallel to the direction of the incident light. This characteristic makes mirror reflection play a key role in laser guidance, laser ranging, laser projection and other applications.

[0003] Due to the design limitations of existing adjusting devices, operators often have difficulty accurately controlling the adjustment amount when adjusting the angle. This results in a large change in the angle of the mirror, which makes it difficult to accurately control the reflection path of the laser beam. The laser beam cannot be accurately reflected to the intended target position, resulting in a significant reduction in positioning accuracy and affecting the overall performance of the laser system. Moreover, if the laser beam is not properly adjusted, the laser beam may hit the edge of the mirror, causing thermal stress on the edge of the mirror, which may cause cracks or breakage. This not only affects the performance of the laser system, but also increases the maintenance cost and safety risk of the equipment. SUMMARY

[0004] The purpose of the present application is to provide a mirror adjusting device to solve the problem of low accuracy of the mirror adjusting device in the prior art.

[0005] The technical solution of the present application is: a mirror adjusting device, comprising: a rack; an adjusting assembly rotatably connected to the rack for carrying a mirror, the adjusting assembly having two rotational degrees of freedom, the two rotational axes of the adjusting assembly intersecting at a first plane; a driving assembly movably connected to the rack, the output end of the driving assembly movably connected to the adjusting assembly, the driving assembly driving the adjusting assembly to rotate, the center of the mirror overlapping with the rotation center of the adjusting assembly.

[0006] Preferably, the driving assembly has two translational degrees of freedom, wherein the driving assembly moves in the vertical direction to drive the adjusting assembly to rotate about a horizontal axis, and wherein the driving assembly moves in the horizontal direction to drive the adjusting assembly to rotate about a vertical axis.

[0007] Preferably, the adjusting assembly comprises a support frame and a support seat, the support frame being rotatably connected to the rack, the support seat being rotatably connected to the support frame, the rotational axis of the support seat and the rotational axis of the support frame being located in the first plane and intersecting, the support seat being movably connected to the driving assembly.

[0008] Preferably, the support frame has a receiving cavity for supporting the mirror, the support base has a through hole communicating with the receiving cavity, and the intersection of the horizontal axis and the vertical axis of the adjustment component overlaps with the center of the through hole.

[0009] Preferably, the support base is fixedly provided with a connecting rod, the central axis of the connecting rod, the center of the support frame and the center of the support base are coaxially arranged, and the end of the connecting rod away from the support base is movably connected to the drive assembly through a fisheye bearing.

[0010] Preferably, the drive assembly includes a carrier frame slidably connected to the frame; the carrier frame is slidably connected to a support frame, the adjustment assembly is movably connected to the support frame, the sliding trajectory of the support frame and the sliding trajectory of the carrier frame are both located on the same plane, and the sliding direction of the support frame is set at an angle to the sliding direction of the carrier frame.

[0011] Preferably, the rotation axis of the support base intersects perpendicularly with the rotation axis of the support frame, the linear sliding trajectory of the bearing frame is parallel to the rotation axis of the support frame, and the linear sliding trajectory of the support frame is parallel to the rotation axis of the support base.

[0012] Preferably, the frame is provided with a first driving member, the output end of which is connected to the support frame, and the output end of the first driving member moves along the central axis of the support frame; the support frame is provided with a second driving member, the output end of which is connected to the top of the support frame, and the second driving member drives the support frame to move along the central axis of the support frame.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] (1) Since the two rotational axes of the adjustment component intersect at the first plane, which is the center point of the mirror supported on the adjustment component, the driving component controls the centering rotation of the adjustment component, thereby controlling the centering rotation of the mirror. The center point will remain in the same position, thus ensuring the accuracy and stability of the reflection angle adjustment, reducing the influence of small deviations on the laser beam propagation path. By ensuring the constant position of the center point of the mirror during the rotation process, the laser beam reflection angle can be accurately adjusted to meet the needs of high-precision optical applications.

[0015] (2) The two translational degrees of freedom correspond to the two rotational degrees of freedom, which independently control the two rotation angles of the mirror. This allows for more precise control of rotation in each direction when adjusting the mirror angle, without being affected by rotation in the other direction. This reduces the risk of the entire system failing due to a fault in one part, improves the reliability and stability of the overall structure, and enables the optical equipment to maintain high performance operation in various complex environments.

[0016] (3) The drive assembly transmits power to the connecting rod through the fisheye bearing, thereby controlling the centering rotation of the support frame and the support base, realizing flexible adjustment of the mirror position or posture. The perpendicular intersection of the rotation axis of the support base and the rotation axis of the support frame helps to maintain the stability of the support base during rotation, avoid unnecessary shaking or deviation, ensure the accuracy and consistency of the motion trajectory, thereby improving the precision of mirror adjustment, and making the laser beam adjust in the range close to the center of the mirror, avoiding the situation where the laser beam hits the edge of the mirror and causes damage to the mirror.

[0017] (4) The first driving component drives the support frame to move, and the connecting rod swings relative to the support frame in the direction of the rotation axis of the support frame through the fisheye bearing. The connecting rod drives the support seat to rotate relative to the support frame. The second driving component drives the support frame to move, and the connecting rod swings relative to the support frame in the direction of the rotation axis of the support seat through the fisheye bearing. The connecting rod drives the support frame and the support seat to rotate relative to the frame. When the first driving component and the second driving component drive at the same time, the center point of the mirror inside the support frame will remain in the same position, further ensuring the accuracy and stability of the laser beam reflection angle adjustment. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of a mirror adjustment device according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the mirror adjustment device described in this invention.

[0021] Figure 3 This is a schematic diagram of the support frame described in this invention;

[0022] Figure 4 This is a schematic diagram of the conversion relationship between the support frame and the support base described in this invention;

[0023] Figure 5 This is a schematic diagram of the structure of the driving component described in this invention;

[0024] Figure 6 This is a cross-sectional view of the driving component described in this invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Frame; 11. First support; 12. Second support; 13. Third support; 2. Adjustment assembly; 21. Support frame; 211. First rotating shaft; 212. Second rotating shaft; 213. Third rotating shaft; 214. Fourth rotating shaft; 215. Through hole; 22. Support base; 221. Receiving cavity; 23. First guide; 24. Second guide; 25. Connecting rod; 3. Drive assembly; 31. Bearing frame; 32. Support frame; 33. First slide rail; 34. Second slide rail; 35. Fisheye bearing; 36. First drive component; 37. Second drive component; 38. Baffle; 39. Frame body; 4. Mirror. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] Embodiments of the present invention 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 below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0030] like Figure 1 and Figure 2 As shown, a mirror adjustment device includes a frame 1, an adjustment component 2, and a drive component 3. The adjustment component 2 carries a mirror 4 and is rotatably connected to the frame 1 for adjusting the mirror 4. The drive component 3 is movably connected to the adjustment component 2 and drives the adjustment component 2 to rotate, so that the adjustment component 2 drives the mirror 4 to rotate, adjusting the tilt angle of the mirror 4, thereby adjusting the reflection angle of the laser beam.

[0031] Adjustment component 2 has two rotational degrees of freedom, that is, it has two rotational axes, both of which are located on the first plane and intersect. Adjustment component 2 rotates around this intersection point. Drive component 3 is movably connected to frame 1. Drive component 3 has two translational degrees of freedom. Drive component 3 translates in the vertical and horizontal directions, and both the vertical and horizontal trajectories are located on a second plane parallel to the first plane. Drive component 3 drives adjustment component 2 to rotate in a centered manner, thereby rotating the mirror 4 located within adjustment component 2 in a centered manner.

[0032] It is worth noting that the first plane can be any plane. In this embodiment, the first plane is the vertical plane where one of the rotation axes of the adjustment component 2 is located. The second plane is parallel to the first plane and is located at a certain distance to its left (or right).

[0033] A first bracket 11 and a second bracket 12 are fixedly connected to the frame 1. The first bracket 11 and the second bracket 12 are arranged in parallel, and space is left between the first bracket 11 and the second bracket 12 for assembling the adjustment assembly 2. Specifically, the first bracket 11 is rotatably connected to a first rotating shaft 211 via ball bearings, and the second bracket 12 is rotatably connected to a second rotating shaft 212 via ball bearings. The rotation axis of the first rotating shaft 211 and the rotation axis of the second rotating shaft 212 are coaxial and located on a first plane.

[0034] like Figure 3 and Figure 4 As shown, the adjustment assembly 2 includes a support frame 21 and a support base 22. The first rotating shaft 211 and the second rotating shaft 212 are both fixedly connected to the outer wall of the support frame 21. The axis of rotation of the first rotating shaft 211 and the axis of rotation of the second rotating shaft 212 are the axis of rotation of the support frame 21. The support frame 21 has a through hole 215. The central axis of the through hole 215 is perpendicular to the axis of rotation of the support frame 21. That is, the central axis of the through hole 215 intersects the axis of rotation of the support frame 21 on a first plane. The intersection point of the two rotational degrees of freedom of the adjustment assembly 2 coincides with the center of the through hole 215.

[0035] The support base 22 is rotatably connected to the support frame 21. Specifically, a third rotating shaft 213 and a fourth rotating shaft 214 are fixedly provided on the outer wall of the support frame 21. The rotation axis of the third rotating shaft 213 and the rotation axis of the fourth rotating shaft 214 are coaxially arranged. The rotation axis of the third rotating shaft 213 and the fourth rotating shaft 214, as well as the rotation axis formed by the first rotating shaft 211 and the second rotating shaft 212, intersect at a first plane. The support base 22 is rotatably connected to the support frame 21 through the three rotating shafts and the fourth rotating shaft 214. Specifically, part of the support base 22 is located in the through hole 215 of the support frame 21, and there is a certain distance between the outer wall of the support base 22 and the inner wall of the support frame 21. When the support base 22 rotates relative to the support frame 21, interference between the support base 22 and the support frame 21 is avoided.

[0036] In this embodiment, the outer wall of the support base 22 is provided with a first guide member 23 and a second guide member 24. The first guide member 23 and the second guide member 24 are fixedly connected to the outer wall of the support base 22 and are opposite to each other. Both the first guide member 23 and the second guide member 24 protrude away from the outer wall of the support base 22. The first guide member 23 is rotatably connected to the third rotating shaft 213 through a bearing and abuts against the top outer wall of the support frame 21. The second guide member 24 is rotatably connected to the fourth rotating shaft 214 through a bearing and abuts against the bottom outer wall of the support frame 21. The first guide member 23 and the second guide member 24 serve to support the weight of the support base 22. The rotation axis of the third rotating shaft 213 and the rotation axis of the fourth rotating shaft 214 are the rotation axis of the support base 22, that is, the rotation axis of the support base 22 intersects the rotation axis of the support frame 21.

[0037] Specifically, the support base 22 has a receiving cavity 221 and an opening, the opening connecting the receiving cavity 221 and the through hole 215. Preferably, the receiving cavity 221 is a cylindrical cavity, and the central axis of the receiving cavity 221 is coaxial with the central axis of the through hole 215. The mirror 4 is placed in the receiving cavity 221. The mirror 4 is a circular lens with a certain thickness. The outer periphery of the mirror 4 abuts against the inner wall of the receiving cavity 221. The center point of the mirror 4 is the intersection point of the rotation central axis of the support base 22 and the rotation central axis of the support frame 21. That is, the operator can achieve the centering rotation of the mirror 4 by rotating the support base 22 and the support frame 21.

[0038] like Figure 5 and Figure 6 As shown, the drive assembly 3 has two mutually perpendicular translational degrees of freedom in the second plane. The drive assembly 3 is movably connected to the adjustment assembly 2. The motion trajectory of one translational degree of freedom is parallel to the rotational axis of the support frame 21, and the motion trajectory of the other translational degree of freedom is parallel to the rotational axis of the support seat 22. That is, one translational degree of freedom controls one rotational degree of freedom, and the other translational degree of freedom controls the other rotational degree of freedom.

[0039] Specifically, the drive assembly 3 includes a support frame 31 and a first slide rail 33. The first slide rail 33 is fixedly connected to the frame 1. The central axis of the first slide rail 33 is parallel to the rotational central axis of the support frame 21, and the central axis of the first slide rail 33 is located on the second plane. The support frame 31 is slidably connected to the first slide rail 33, that is, the support frame 31 is slidably connected to the frame 1 along the length direction of the first slide rail 33.

[0040] The support frame 31 has an "L" shaped cross-section. The horizontal portion of the support frame 31 is slidably connected to the first slide rail 33, and the vertical portion of the support frame 31 is fixedly provided with a second slide rail 34. The second slide rail 34 is arranged vertically and is slidably connected to a support frame 32, allowing the support frame 32 to slide vertically. The central axis of the second slide rail 34 is parallel to the rotational central axis of the support base 22, that is, the support frame 32 slides along the central axis of the second slide rail 34 and the support frame 31. The central axis of the second slide rail 34 is located on a second plane. Preferably, the central axis of the second slide rail 34 is perpendicular to the central axis of the first slide rail 33. Within the length range of the first slide rail 33 and the length range of the second slide rail 34, the output end of the support frame 32 can move arbitrarily on the second plane.

[0041] A connecting rod 25 is fixedly mounted on the end face of the support base 22 away from the support frame 21. The end of the connecting rod 25 away from the support base 22 is movably connected to the drive assembly 3. The central axis of the connecting rod 25, the center of the support frame 21, and the center of the support base 22 are coaxially arranged. The drive assembly 3 controls the rotation of the support base 22 and the support frame 21 through the connecting rod 25. Preferably, the support frame 32 has a built-in fisheye bearing 35, and the connecting rod 25 is movably connected to the support frame 32 through the fisheye bearing 35.

[0042] Specifically, the support frame 32 is fixedly provided with a frame 39 for supporting the fisheye bearing 35. The inner wall of the frame 39 is an arc surface. Preferably, the fisheye bearing 35 is a sphere, and more preferably, the fisheye bearing 35 is an ellipsoid. The fisheye bearing is movably embedded in the frame 39, that is, the fisheye bearing 35 rotates within the frame 39, and the frame 39 restricts the fisheye bearing 35 from detaching from the frame 39. Preferably, the frame 39 has a plate-like structure, and both ends of the fisheye bearing 35 can be exposed outside the frame 39. The connecting rod 25 is slidably connected to the fisheye bearing 35, that is, the connecting rod 25 moves from one end of the fisheye bearing 35 through the other end.

[0043] When the support frame 31 slides relative to the first slide rail 33, the fisheye bearing 35 rotates horizontally, and the connecting rod 25 slides relative to the fisheye bearing 35. Simultaneously, the connecting rod 25 drives the support base 22 to rotate along its vertical axis. When the support frame 32 slides relative to the second slide rail 34, the fisheye bearing 35 rotates vertically, and the connecting rod 25 slides relative to the fisheye bearing 35. Simultaneously, the connecting rod 25 drives the support base 22 to rotate along its horizontal axis. The support frame 31 and the support frame 32 can rotate simultaneously, allowing for angle adjustment of the support base 22.

[0044] A third support 13 is fixedly connected to the frame 1. The third support 13 is located on the side of the first slide rail 33 opposite to the first support 11. A first driving member 36 is fixedly connected to the third support 13. The output end of the first driving member 36 moves parallel to the central axis of the first slide rail 33. A baffle 38 is fixedly connected to the support frame 31. In this embodiment, the baffle 38 is fixedly connected to the output end of the first driving member 36. The first driving member 36 drives the baffle 38 to move, thereby driving the support frame 31 to move relative to the first slide rail 33. In other embodiments, the baffle 38 is located on the moving path of the output end of the first driving member 36. The baffle 38 is provided with a spring. One end of the spring is fixedly connected to the third support 13, and the other end is fixedly connected to the baffle 38. The first driving member 36 cooperates with the spring to control the movement of the baffle 38. In this embodiment, the first driving member 36 is a cylinder. In other embodiments, the first driving member 36 can be a lead screw.

[0045] A second driving member 37 is fixedly mounted on the support frame 32. The output end of the second driving member 37 faces the support frame 31 and is parallel to the central axis of the second slide rail 34, that is, the output end of the second driving member 37 is arranged vertically. In this embodiment, the second driving member 37 is a cylinder, and the piston rod of the second driving member 37 abuts against the support frame 31 to facilitate quick assembly and disassembly of the second driving member 37. Under the action of gravity, the end of the piston rod of the second driving member 37 always abuts against the upper surface of the horizontal portion of the support frame 31. When the cylinder of the second drive member 37 moves upward relative to the piston rod of the second drive member 37, the second drive member 37 lifts the support frame 32. That is, the piston rod of the second drive member 37 is stationary relative to the carrier frame 31, and the cylinder of the second drive member 37 drives the support frame 32 to slide vertically relative to the second slide rail 34. When the cylinder of the second drive member 37 moves downward relative to the piston rod of the second drive member 37, the second drive member 37 drives the support frame 32 to descend. In other embodiments, the piston rod of the second drive member 37 is fixedly connected to the carrier frame 31 to ensure the accuracy of the movement of the support frame 32.

[0046] Implementation Principle: The first driving component 36 drives the support frame 31 to move. The connecting rod 25 swings relative to the support frame 32 in the direction of the rotation axis of the support frame 21 via the fisheye bearing 35. The connecting rod 25 drives the support seat 22 to rotate relative to the support frame 21, that is, the support seat 22 rotates around its own rotation axis. The second driving component 37 drives the support frame 32 to move. The connecting rod 25 swings relative to the support frame 32 in the direction of the rotation axis of the support seat 22 via the fisheye bearing 35. The connecting rod 25 drives the support frame 21 and the support seat 22 to rotate relative to the first bracket 11 and the second bracket 12. That is, the support frame 21 and the support seat 22 rotate around the rotation axis of the support frame 21. Since the rotation axes of the support frame 21 and the support frame 32 intersect at one point, namely the center point of the mirror 4, when the first driving component 36 and the second driving component 37 are driven simultaneously, the center point of the mirror 4 located in the support frame 31 will remain in the same position, ensuring the accuracy and stability of the laser beam reflection angle adjustment.

[0047] The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

Claims

1. A mirror adjustment device, characterized in that, include: Rack (1); Adjustment component (2) is rotatably connected to the frame (1) and is used to support mirror (4). The adjustment component (2) has two rotational degrees of freedom, and the two rotational axes of the adjustment component (2) intersect at the first plane. A drive assembly (3) is movably connected to the frame (1). The output end of the drive assembly (3) is movably connected to the adjustment assembly (2). The drive assembly (3) drives the adjustment assembly (2) to rotate in a centered manner. The center of the mirror (4) overlaps with the rotation center of the adjustment assembly (2). The driving component (3) has two translational degrees of freedom, wherein the driving component (3) moves in the vertical direction to drive the adjusting component (2) to rotate about the horizontal axis, and wherein the driving component (3) moves in the horizontal direction to drive the adjusting component (2) to rotate about the vertical axis; The adjustment component (2) includes a support frame (21) and a support base (22). The support frame (21) is rotatably connected to the frame (1). The support base (22) is rotatably connected to the support frame (21). The rotation axis of the support base (22) and the rotation axis of the support frame (21) are located in the first plane and intersect. The support base (22) is movably connected to the drive component (3). The frame (1) is fixedly connected to a first bracket (11) and a second bracket (12). There is space between the first bracket (11) and the second bracket (12) for assembling the adjustment assembly (2). The first bracket (11) is rotatably connected to a first rotating shaft (211) via ball bearings. The second bracket (12) is rotatably connected to a second rotating shaft (212) via ball bearings. The first rotating shaft (211) and the second rotating shaft (212) are both fixedly connected to the outer wall of the support frame (21). The rotation axis of the first rotating shaft (211) and the rotation axis of the second rotating shaft (212) are coaxial. The first rotating shaft (211) and the second rotating shaft (212) are both fixedly connected to the outer wall of the support frame (21). The outer wall of the support frame (21) is fixed with a third rotating shaft (213) and a fourth rotating shaft (214). The rotation axis of the third rotating shaft (213) and the rotation axis of the fourth rotating shaft (214) are coaxially arranged. The support seat 22 is rotatably connected to the support frame (21) through the third rotating shaft (213) and the fourth rotating shaft (214). The support frame (21) has a receiving cavity (221) for supporting the mirror (4), and the support base (22) has a through hole (215) communicating with the receiving cavity (221). The intersection of the horizontal axis and the vertical axis of the adjustment component (2) overlaps with the center of the through hole (215). The support base (22) is fixedly provided with a connecting rod (25). The central axis of the connecting rod (25), the center of the support frame (21) and the center of the support base (22) are coaxially arranged. The end of the connecting rod (25) away from the support base (22) is movably connected to the drive assembly (3) through a fisheye bearing (35). The drive assembly (3) is provided with a frame (39), the fisheye bearing (35) rotates within the frame (39), and the frame (39) restricts the fisheye bearing (35) from disengaging from the frame (39). The drive assembly (3) includes a support frame (31) which is slidably connected to the frame (1). The support frame (32) is slidably connected to the support frame (31), and the adjustment component (2) is movably connected to the support frame (32). The sliding trajectory of the support frame (32) and the sliding trajectory of the support frame (31) are both located on the same plane, and the sliding direction of the support frame (32) is set at an angle to the sliding direction of the support frame (31). The rotation axis of the support base (22) is perpendicular to the rotation axis of the support frame (21), the linear sliding trajectory of the bearing frame (31) is parallel to the rotation axis of the support frame (21), and the linear sliding trajectory of the support frame (32) is parallel to the rotation axis of the support base (22).

2. The mirror adjustment device according to claim 1, characterized in that: The frame (1) is provided with a first drive member (36), the output end of the first drive member (36) is connected to the support frame (31), and the output end of the first drive member (36) moves along the central axis of the support frame (31); the support frame (32) is provided with a second drive member (37), the output end of the second drive member (37) is connected to the top of the support frame (31), and the second drive member (37) drives the support frame (32) to move along the central axis of the support frame (31).

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