A multi-optical axis consistency detection device

Abstract

This invention relates to the technical field of axis alignment, specifically to a multi-axis consistency testing device. The device includes a frame and a reference device, which includes a fixing mechanism and a reference optical circuit; a testing device, which includes a second detection light source mounted on the frame, a second optical right angler positioned in front of the second detection light source, and a reflector positioned in front of the light beam of the second optical right angler; and a moving device, which includes a first track mounted on the frame, a moving seat mounted on the first track, a support column mounted on the moving seat, a ball joint at the top of the support column, a connecting block at the upper end of the ball joint, an adjusting plate connected to the connecting block, a support plate connected to the adjusting plate, a clamping component connected to the support plate, and a swing mechanism connected to the first connecting rod. The advantages are that it not only achieves axis alignment of shaft-type parts but also provides dynamic monitoring and convenient operation.

Description

Technical Field

[0001] This invention relates to the technical field of axis alignment, and more specifically to a multi-axis consistency detection device. Background Technology

[0002] Optical axis consistency refers to the requirement that, in a multi-optical-axis system, one optical axis serves as a reference, and the remaining optical axes are parallel to the reference axis to a certain extent. Currently, the main methods for calibrating multi-optical-axis consistency include the collimator method, the field long-distance target method, and the off-axis parabolic lens method. The most commonly used collimator method has fewer error points and higher measurement accuracy, but the equipment is bulky and expensive, unsuitable for portability and rapid debugging, and only suitable for laboratory use, not outdoor use. The field long-distance target method has the advantages of low cost and simple operation, but the disadvantage is that it requires testing in a relatively open and flat area. The off-axis parabolic lens method has the advantage of using the same metal crosshair to form visible light and infrared simulated targets, which can avoid central obstruction and improve transmittance. However, the crosshair deforms after heating, and repeated heating cannot guarantee the measurement accuracy of the crosshair.

[0003] A patent publication number CN219757692U, entitled "A Multi-Axis Consistency Detection Device," was found. The device specifically discloses a multi-axis consistency detection device, including a frame. The frame houses a fixed visible / infrared light source, a movable laser light source, a beam-splitting optical component, an imaging component, and a refracting optical path component. The beam-splitting optical component has two incident light paths, a first exit light path, and a second exit light path. Light from both incident light paths is emitted from the first and second exit light paths. The visible / infrared light source and the laser light source are respectively positioned on the two incident light paths of the beam-splitting optical component and emit light towards it. The imaging component receives the light from the first exit light path and forms an image. The refracting optical path component receives the light from the second exit light path and performs several reflections to split the light into a light spot target.

[0004] Analysis of the aforementioned disclosed material reveals that multi-axis consistency can be detected. However, its effectiveness is less than ideal for axial alignment of shaft-type parts, and the alignment process is inconvenient. Specifically, the disclosed material enables in-situ detection of the optical axis consistency of a multi-axis observation and aiming system under both internal and external field conditions. It can provide aiming targets for each passive optical channel within the effective field of view of the observation and aiming system and receive spectral signals output from each active optical channel. However, this disclosed material cannot be used for detecting the surface flatness of shaft-type parts. Furthermore, due to the structural characteristics of this disclosed material, it cannot be used. Summary of the Invention

[0005] In view of this, the present invention provides a multi-axis consistency detection device, which can not only realize the alignment of the axis of shaft parts, but also dynamically monitor and is easy to operate.

[0006] To address the aforementioned technical problems, this invention provides a multi-optical axis consistency detection device, including a frame and further comprising... The reference device includes a fixing mechanism and a reference optical circuit. The detection device includes a second detection light source mounted on a frame, a second optical right angle device positioned in front of the second detection light source, and a reflector positioned in front of the light beam of the second optical right angle device. A mobile device includes a first track mounted on a frame, a movable seat mounted on the first track, a support column mounted on the movable seat, a ball head mounted on the top of the support column, a connecting block mounted on the upper end of the ball head, an adjusting plate and a first connecting rod connected to the connecting block, a support plate connected to the adjusting plate, a clamping member connected to the support plate, and a swing mechanism connected to the first connecting rod.

[0007] Furthermore, the fixing mechanism includes a cylinder connected to the frame, the output end of the cylinder is provided with a push rod, the push rod is connected to a pull rod, the pull rod is connected to a third clamping member, the end of the third clamping member is arc-shaped, the third clamping member is connected to the shaft to be inspected, and the end of the third clamping member locks the shaft to be inspected for fixing the frame.

[0008] Furthermore, the reference optical circuit includes a first detection light source mounted on the frame, a first optical right angler is mounted in front of the first detection light source, the first optical right angler is connected to a fixed frame, the fixed frame is mounted on the inner side of the frame and is fixedly connected to the frame, a third optical right angler is mounted on the fixed frame, and a crosshair cursor display is mounted in front of the circuit of the third optical right angler.

[0009] Furthermore, the second detection light source is a collimator main unit. The second detection light source is connected to a crosshair display via a circuit. An auxiliary mechanism is provided above the second detection light source. The auxiliary mechanism includes a second track connected to the frame. A motor is provided at the upper end of the second track. The output end of the motor is connected to a screw, and a support frame is connected to the screw. The support frame is connected to the second track and can move on the second track. A laser head is provided on the support frame. After the laser head descends, it moves to the front of the second detection light source.

[0010] Furthermore, the light reflected from the first track and the first optical right angler is parallel, the first optical right angler is fixed on the fixed plate, and the first detection light source is fixed on the frame.

[0011] Furthermore, the adjusting plate is provided with a sliding groove, and the connecting block and the adjusting plate are slidably connected, with the sliding space being the length of the sliding groove.

[0012] Furthermore, the clamping member includes a first clamping member and a second clamping member. The first clamping member is fixedly connected to the support plate. The first clamping member has an arc-shaped structure. The second clamping member is hinged to the support plate. A tension spring is provided between the first clamping member and the second clamping member, and the tension spring is used to clamp the shaft to be inspected by the first clamping member and the second clamping member.

[0013] Furthermore, the swing mechanism includes a support plate disposed on the other side of the adjustment plate, a rotating shaft connected to the support plate, a reflector disposed at the lower end of the rotating shaft, the reflector and the second optical right angle device being on the same straight line, a second connecting rod connected to the upper part of the rotating shaft, the second connecting rod being hinged to the first connecting rod, and the second connecting rod and the rotating shaft being fixedly connected.

[0014] The beneficial effects of the above-described technical solution of the present invention are as follows: 1. It can achieve axis alignment of shaft parts. Through the structural design of the first clamping part, the second clamping part and the third clamping part, the axis alignment of shaft parts can be detected.

[0015] 2. Dynamic monitoring and easy operation: This technology displays the changes of the crosshair cursor in real time on the crosshair cursor display by moving a reflector, thereby achieving comparison with the reference cursor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 for Figure 1 Enlarged view of section B; Figure 4 for Figure 1 Enlarged view of section C; Figure 5 for Figure 1 A structural diagram from another perspective; Figure 6 for Figure 5 Enlarged view of section D in the middle; Figure 7 for Figure 1 A structural diagram from another perspective; Figure 8 for Figure 7 Enlarged view of section E in the middle; Figure 9 for Figure 1 A structural diagram from another perspective; Figure 10 for Figure 9 A structural diagram from another perspective; Figure 11 for Figure 10 Enlarged view of section F in the middle.

[0017] In the diagram: 1. Frame; 2. Fixing frame; 3. First optical right angle device; 4. First detection light source; 5. Second detection light source; 6. Second optical right angle device; 7. Shaft to be inspected; 8. First track; 9. Third optical right angle device; 10. Moving seat; 11. Support column; 12. Adjusting plate; 13. Slide groove; 14. Support plate; 15. First connecting rod; 16. Connecting block; 17. First clamping component; 18. Tension spring; 19. Second clamping component; 20. Cylinder; 21. Push rod; 22. Third clamping component; 23. Pull rod; 24. Second track; 25. Motor; 26. Support frame; 27. Laser head; 28. Rotating shaft; 29. ​​Second connecting rod; 30. Ball head; 31. Reflector; 32. Crosshair indicator. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figures 1 to 11 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0019] like Figures 1 to 11 As shown: Example 1

[0020] A multi-axis consistency testing device includes a frame 1 and a reference device, the reference device including a fixing mechanism and a reference optical circuit; a testing device including a second detection light source 5 disposed on the frame 1, a second optical right angler 6 disposed in front of the second detection light source 5, and a reflector 31 disposed in front of the light beam of the second optical right angler 6; and a moving device including a first track 8 disposed on the frame 1, a moving seat 10 disposed on the first track 8, a support column 11 disposed on the moving seat 10, a ball head 30 disposed at the top of the support column 11, a connecting block 16 disposed at the upper end of the ball head 30, an adjusting plate 12 and a first connecting rod 15 connected to the connecting block 16, a support plate 14 connected to the adjusting plate 12, a clamping member connected to the support plate 14, and a swing mechanism connected to the first connecting rod 15.

[0021] In this embodiment, the frame 1 is a hollow structure, and a reference device is set on the frame 1. The reference device serves as a reference comparison. The reference device includes a fixing mechanism and a reference optical circuit. The fixing mechanism is used to fix the frame 1 on the shaft to be inspected 7. The reference optical circuit serves as a reference circuit and is used for comparison when detecting the axis of the shaft to be inspected 7.

[0022] Specifically, the alignment detection of the axis is achieved dynamically, including a detection device. The detection device includes a second detection light source 5, which is mounted on the frame 1. A second optical right angler 6 is set in front of the light emitted by the second detection light source 5 for path conversion. Then, a movable reflector 31 is set in front of the light emitted by the second optical right angler 6. The light reflected by the reflector 31 is used to determine whether the light is on a straight line.

[0023] Since it is a dynamic detection, a moving device is also provided. Specifically, a first track 8 is provided at the end of the frame 1, and a movable seat 10 is provided on the first track 8. The movable seat 10 can move on the first track 8. A connecting block 16 is provided on the top of the movable seat 10, and a support column 11 is provided on the connecting block 16. A ball head 30 is provided on the top of the support column 11. The ball head 30 is connected to an adjusting plate 12. Both ends of the adjusting plate 12 are provided with support plates 14. A clamping part is provided on one of the support plates 14 for clamping the shaft 7 to be inspected. A reflector 31 is installed on the other support plate 14.

[0024] To detect swaying during movement, a swaying mechanism is installed. By installing this mechanism, when the axes become misaligned, the reflector 31 will sway, thereby allowing the position where the axis changes to be measured. Example 2

[0025] The fixing mechanism includes a cylinder 20 connected to the frame 1. The output end of the cylinder 20 is provided with a push rod 21. The push rod 21 is connected to a pull rod 23. The pull rod 23 is connected to a third clamping member 22. The end of the third clamping member 22 is arc-shaped. The third clamping member 22 is connected to the shaft to be inspected 7, and the end of the third clamping member 22 locks the shaft to be inspected 7 to fix the frame 1.

[0026] Unlike the above embodiments, in this embodiment, the cylinder 20 is horizontally arranged and fixed on the outer side of the frame 1. The cylinder 20 is connected to a push rod 21. A third clamping member 22 is hinged to the end of the cylinder 20. A pull rod 23 is hinged to the end of the push rod 21. The other end of the pull rod 23 is hinged to the third clamping member 22. The end of the third clamping member 22 is arc-shaped. The swinging of the third clamping member 22 achieves the clamping and fixing of the shaft 7 to be inspected. Example 3

[0027] The reference optical circuit includes a first detection light source 4 mounted on the frame 1. A first optical right angler 3 is mounted in front of the first detection light source 4. The first optical right angler 3 is connected to a fixing frame 2. The fixing frame 2 is mounted on the inner side of the frame 1 and is fixedly connected to the frame 1. A third optical right angler 9 is also mounted on the fixing frame 2. A crosshair cursor display 32 is mounted in front of the circuit of the third optical right angler 9.

[0028] Unlike the above embodiments, in this embodiment, the reference light line can form a crosshair, which is used for reference comparison, that is, for comparing the signal transmitted from the second detection light source 5 to the crosshair display 32. Deviation indicates that they are not on the same axis. Example 4

[0029] The second detection light source 5 is the collimator main unit. The second detection light source 5 is connected to the crosshair display 32 via a line. An auxiliary mechanism is provided above the second detection light source 5. The auxiliary mechanism includes a second track 24 connected to the frame 1. A motor 25 is provided at the upper end of the second track 24. The output end of the motor 25 is connected to a screw, and a support frame 26 is connected to the screw. The support frame 26 is connected to the second track 24 and can move on the second track 24. A laser head 27 is provided on the support frame 26. After the laser head 27 descends, it moves to the front of the second detection light source 5.

[0030] Unlike the above embodiments, in this embodiment, the second detection light source 5 is the collimator host, and the second detection light source 5 is connected to the crosshair display 32. In order to perform better detection, an auxiliary mechanism is set on the second detection light source 5. Specifically, the auxiliary mechanism includes a second track 24 on the frame 1. The second track 24 is arranged vertically, and a motor 25 is set on the second track 24. The output end of the motor 25 is connected to a vertically arranged screw, and the screw is connected to a support frame 26. The support frame 26 is L-shaped, and a laser head 27 is set at the end of the support frame 26. Example 5

[0031] The light reflected by the first track 8 and the first optical right angle device 3 is parallel. The first optical right angle device 3 is fixed on the fixed plate, and the first detection light source 4 is fixed on the frame 1.

[0032] Unlike the above embodiments, in this embodiment, since the first track 8 is the reference track, the first track 8 needs to be set to be parallel to the light reflected by the first optical right angler 3. Example 6

[0033] The adjusting plate 12 is provided with a sliding groove 13, and the connecting block 16 and the adjusting plate 12 are slidably connected, with the sliding space being the length of the sliding groove 13.

[0034] Unlike the above embodiments, in this embodiment, in order to realize the position change during the movement, a sliding groove 13 is provided on the adjustment plate 12, and the connecting block 16 and the adjustment plate 12 are slidably connected. In order to change the position, the adjustment plate 12 will change position. Example 7

[0035] The clamping components include a first clamping component 17 and a second clamping component 19. The first clamping component 17 is fixedly connected to the support plate 14. The first clamping component 17 has an arc-shaped structure. The second clamping component 19 is hinged to the support plate 14. A tension spring 18 is provided between the first clamping component 17 and the second clamping component 19, and the first clamping component 17 and the second clamping component 19 clamp the shaft to be inspected 7 through the tension spring 18.

[0036] Unlike the embodiments described above, in this embodiment, the clamping member is used to hold the shaft 7 to be inspected. The clamping member is not fixed to the shaft 7, but rather moves along the shaft 7 and maintains close contact. Specifically, the first clamping member 17 has an arc-shaped structure, the second clamping member 19 and the support plate 14 are hinged, and a tension spring 18 is provided between the first clamping member 17 and the second clamping member 19 to achieve close contact between the clamping member and the shaft 7 to be inspected. Example 8

[0037] The swing mechanism includes a support plate 14 disposed on the other side of the adjustment plate 12. A rotating shaft 28 is connected to the support plate 14. A reflector 31 is disposed at the lower end of the rotating shaft 28. The reflector 31 and the second optical right angle device 6 are on the same straight line. A second connecting rod 29 is connected to the upper part of the rotating shaft 28. The second connecting rod 29 is hinged to the first connecting rod 15. The second connecting rod 29 and the rotating shaft 28 are fixedly connected.

[0038] Unlike the above embodiments, in this embodiment, the function of the swing mechanism is to cause the reflector 31 to swing when the axis changes, thereby improving the detection sensitivity. A first connecting rod 15 is hinged to the connecting block 16, and the first connecting rod 15 is hinged to a second connecting rod 29. The second connecting rod 29 is fixedly connected to a rotating shaft 28, which is connected to a support plate 14 via a bearing. The reflector 31 is connected to the lower end of the rotating shaft 28.

[0039] The working method (or working principle) of this invention: When this technology is in operation, firstly, the frame 1 is fixed to the shaft 7 to be inspected by the fixing mechanism. In specific operation, the controller controls the cylinder 20 to move. After the push rod 21 on the cylinder 20 moves, it drives the pull rod 23 to move. Since the pull rod 23 is hinged to the third clamping member 22, the third clamping member 22 achieves the clamping action, which can fix the frame 1 to the shaft 7 to be inspected.

[0040] The reference device is turned on. The reference device serves as a reference comparison. The reference device includes a fixing mechanism and a reference optical circuit. The fixing mechanism is used to fix the frame 1 on the shaft to be inspected 7. The reference optical circuit is used as a reference circuit for comparison when detecting the axis of the shaft to be inspected 7. That is, the reference device is a calibrated device. During the movement of the reflector 31, the crosshair generated needs to be compared with the crosshair generated by the reference optical circuit in order to determine the alignment of the axis. After the first detection light source 4 is turned on, the reference device is turned on, and then the reference cursor is displayed on the crosshair display 32.

[0041] The position of the movable reflector 31 can be changed manually by adjusting the position of the movable base 10. Generally, the detection position is marked on the first track 8. As the reflector 31 moves, when the axis changes, the change is reflected in the reflector 31 through the change of the adjustment plate 12, thereby realizing the change of the crosshair on the crosshair display 32.

[0042] When unevenness appears on the surface of the shaft 7 under inspection, the first clamping member 17 is in close contact with the outer side of the shaft 7 under inspection. As can be seen from the figure, the close contact position occupies one-third of the surface. When a protrusion appears, the first clamping member 17 first tilts and swings, and then moves outward, thereby causing the support plate 14 to swing upward. The support plate 14 and the adjusting plate 12 are integrally formed structures. Since the connecting block 16 supports the adjusting plate 12, the end of the adjusting plate 12 away from the support plate 14 swings downward. The plate located at the other end of the adjusting plate 12 is also called the support plate 14. After the support plate 14 swings downward, it causes the reflector 31 to swing downward. When the first clamping member 17 tilts and swings, the support plate 14 and the adjusting plate 12 also tilt and swing accordingly. Through the first connecting rod 15, the reflector 31 is twisted, thereby changing the reflected light. If the light does not return along the original path, it indicates that the area on the shaft 7 under inspection is not flat.

[0043] This patent is used for precise detection of the convex and concave surfaces on the shaft 7 under inspection. If the convexity and concaveness changes significantly, laser irradiation, a technique already in use, can be employed. This is because when the convexity and concaveness changes significantly, the light emission will be greatly deflected and will not reach the second optical right angle detector 6. If no reflected light is received, it indicates that the deviation of the convexity and concaveness at that location is large, and thus, it can be determined that the area is uneven. Similarly, regardless of whether a reflected light signal is received, the flatness of the shaft 7 under inspection can be determined.

[0044] The second optical right-angle detector 6 receives the light beam emitted by the second detection light source 5, and simultaneously feeds back the light beam emitted from the reflector 31 to the second detection light source 5. If the axis under test 7 is not flat, the two light beams will not overlap; if the axis under test 7 is flat, the two light beams will nearly overlap. This detection device operates within a certain allowable error range. For example, when the crosshair displayed on the crosshair indicator 32 by the reflected light beam is close to or within the error range of the crosshair of the reference device, it is determined that a certain point on the axis under test 7 is flat. Therefore, the two light beams do not interfere with each other.

[0045] This technology utilizes the principle of multi-axis optical beams. One beam serves as a reference device, and a crosshair is displayed on the crosshair indicator 32. A second detection light source 5 is used as the detection beam, and the emitted light is displayed on the crosshair indicator 32 and compared with the reference device, thereby achieving the purpose of multi-axis consistency detection. Multi-axis refers to multiple beams, and consistency refers to whether the flatness of the surface of the shaft 7 under inspection is consistent; more specifically, whether the flatness of the shaft 7 under inspection is within the allowable error range. If the surface of the shaft 7 under inspection exceeds the allowable error range, it indicates that the axial position at that point has also changed. Therefore, the principle of detecting the surface flatness of shaft parts is the same as that of axial alignment.

[0046] It should be noted that the scope of application of this equipment is as follows: when detecting the flatness of shaft parts, this technology is applicable to areas between absolute smoothness and visually relatively flatness. In other words, if the visually apparent flatness of the shaft parts is significant, there is no need to use this equipment for detection, because the reflected light will not reach the second optical right angle device 6. Since no shaft parts have an absolutely smooth surface, the light emitted from the second detection light source 5 and the light reflected back by the reflector 31 will not overlap.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-axis consistency testing device, comprising a frame (1), characterized in that: Also includes The reference device includes a fixing mechanism and a reference optical circuit. The detection device includes a second detection light source (5) set on the frame (1), a second optical right angler (6) is set in front of the second detection light source (5), and a reflector (31) is set in front of the light beam of the second optical right angler (6). The mobile device includes a first track (8) set on a frame (1), a movable seat (10) set on the first track (8), a support column (11) set on the movable seat (10), a ball head (30) set on the top of the support column (11), a connecting block (16) set on the upper end of the ball head (30), an adjusting plate (12) and a first connecting rod (15) connected to the connecting block (16), a support plate (14) connected to the adjusting plate (12), a clamping member connected to the support plate (14), and a swing mechanism connected to the first connecting rod (15).

2. The multi-optical axis consistency detection device according to claim 1, characterized in that: The fixing mechanism includes a cylinder (20) connected to the frame (1). The output end of the cylinder (20) is provided with a push rod (21). The push rod (21) is connected to a pull rod (23). The pull rod (23) is connected to a third clamping member (22). The end of the third clamping member (22) is arc-shaped. The third clamping member (22) is connected to the shaft to be inspected (7), and the end of the third clamping member (22) locks the shaft to be inspected (7) for fixing the frame (1).

3. The multi-optical axis consistency detection device according to claim 2, characterized in that: The reference optical circuit includes a first detection light source (4) set on the frame (1), a first optical right angler (3) set in front of the first detection light source (4), the first optical right angler (3) is connected to a fixing frame (2), the fixing frame (2) is set on the inner side of the frame (1) and fixedly connected to the frame (1), a third optical right angler (9) is also set on the fixing frame (2), and a crosshair cursor display (32) is set in front of the line of the third optical right angler (9).

4. The multi-optical axis consistency detection device according to claim 3, characterized in that: The second detection light source (5) is the collimator host. The second detection light source (5) is connected to the crosshair display (32) via a line. An auxiliary mechanism is provided above the second detection light source (5). The auxiliary mechanism includes a second track (24) connected to the frame (1). A motor (25) is provided at the upper end of the second track (24). A screw is connected to the output end of the motor (25), and a support frame (26) is connected to the screw. The support frame (26) is connected to the second track (24) and can move on the second track (24). A laser head (27) is provided on the support frame (26). After the laser head (27) descends, it moves to the front of the second detection light source (5).

5. The multi-optical axis consistency detection device according to claim 4, characterized in that: The light reflected by the first track (8) and the first optical right angler (3) is parallel. The first optical right angler (3) is fixed on the fixed plate, and the first detection light source (4) is fixed on the frame (1).

6. The multi-optical axis consistency detection device according to claim 5, characterized in that: The adjusting plate (12) is provided with a sliding groove (13), and the connecting block (16) and the adjusting plate (12) are slidably connected, with the sliding space being the length of the sliding groove (13).

7. The multi-optical axis consistency detection device according to claim 6, characterized in that: The clamping components include a first clamping component (17) and a second clamping component (19). The first clamping component (17) is fixedly connected to the support plate (14). The first clamping component (17) has an arc-shaped structure. The second clamping component (19) is hinged to the support plate (14). A tension spring (18) is provided between the first clamping component (17) and the second clamping component (19), and the first clamping component (17) and the second clamping component (19) clamp the shaft to be inspected (7) through the tension spring (18).

8. The multi-optical axis consistency detection device according to claim 7, characterized in that: The swing mechanism includes a support plate (14) on the other side of the adjustment plate (12), a rotating shaft (28) is connected to the support plate (14), a reflector (31) is provided at the lower end of the rotating shaft (28), the reflector (31) and the second optical right angle device (6) are on the same straight line, a second connecting rod (29) is connected to the upper part of the rotating shaft (28), the second connecting rod (29) is hinged to the first connecting rod (15), and the second connecting rod (29) and the rotating shaft (28) are fixedly connected.

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