An elastic pull rod device for adjustable disconnector clamping force and a disconnector switch

Abstract

This invention discloses an adjustable clamping force elastic pull rod device for a disconnecting switch and a disconnecting switch itself. The device includes an adjusting pull rod, a screw plug, a compression spring, a spring sleeve, and a fixed pull rod. The screw plug and the fixed pull rod are positioned opposite each other at both ends of the spring sleeve. The screw plug is threadedly connected to the first end of the spring sleeve, and the fixed pull rod is fixedly connected to the second end of the spring sleeve. The compression spring is located inside the spring sleeve, and the screw plug abuts against the first end of the compression spring. The first end of the adjusting pull rod abuts against the second end of the compression spring, and the second end of the adjusting pull rod passes through the compression spring and the screw plug and extends out of the screw plug. The second end of the adjusting pull rod is axially movably mounted on the screw plug. The elastic pull rod device provided by this invention adjusts the compression force of the compression spring by adjusting the screw plug thread depth, further controlling the clamping state of the compression spring after the disconnecting switch passes its dead point. The device has a simple structure, is easy to install, and has the advantage of maintaining an ideal clamping state for the main disconnecting switch.

Description

Technical Field

[0001] This invention relates to the field of power equipment, and more particularly to an elastic pull rod device for adjustable disconnector clamping force and a disconnector switch. Background Technology

[0002] In power transmission and distribution systems, single-column double-arm vertical telescopic outdoor high-voltage AC disconnect switches are widely used. Under various environmental conditions, outdoor high-voltage AC disconnect switches must operate safely and reliably, which places extremely strict and even demanding requirements on their insulation performance, conductivity performance, and mechanical operation performance. The compressive force of the main switch of the single-column double-arm vertical telescopic outdoor high-voltage AC disconnect switch is an important factor in ensuring the conductivity performance of its conductive circuit. In the existing technology, the effect of maintaining the clamped state of the main switch of the outdoor high-voltage AC disconnect switch is not ideal.

[0003] Therefore, it is necessary to propose an elastic pull rod device and a disconnecting switch with adjustable clamping force to solve the above-mentioned defects. Summary of the Invention

[0004] The main objective of this invention is to provide an elastic pull rod device and a disconnecting switch with adjustable clamping force, which aims to solve the problem that the existing disconnecting switch main switch clamping state is not ideal.

[0005] To achieve the above objectives, the present invention provides an elastic pull rod device for adjustable disconnector clamping force, comprising an adjusting pull rod, a screw plug, a compression spring, a spring sleeve, and a fixed pull rod. The adjusting pull rod, the screw plug, the spring sleeve, and the fixed pull rod are coaxially arranged. The screw plug and the fixed pull rod are disposed opposite to each other at both ends of the spring sleeve. The screw plug is threadedly connected to the first end of the spring sleeve, and the fixed pull rod is fixedly connected to the second end of the spring sleeve. The compression spring is disposed inside the spring sleeve, and the screw plug abuts against the first end of the compression spring. The first end of the adjusting pull rod abuts against the second end of the compression spring. The second end of the adjusting pull rod passes through the compression spring and the screw plug and extends out of the screw plug. The second end of the adjusting pull rod is axially movably disposed on the screw plug.

[0006] Preferably, the adjusting rod is a T-shaped rod, with the large-diameter end of the adjusting rod located inside the spring sleeve, the second end of the compression spring abutting against the large-diameter end of the adjusting rod, and the small-diameter end of the adjusting rod passing through the compression spring and the screw plug in sequence and extending out of the screw plug. The screw plug has a sliding guide hole on its central axis that mates with the small-diameter end.

[0007] Preferably, a connector is provided at the second end of the spring sleeve, the connector is provided with a first internal thread hole, the first end of the fixing rod is an external thread end, and the first end of the fixing rod is threadedly connected to the connector.

[0008] Preferably, the screw plug is made of aluminum.

[0009] Preferably, the second end of the adjusting rod has a second internal threaded hole, and the end of the fixing rod away from the spring sleeve has a third internal threaded hole.

[0010] This invention also provides a high-voltage AC disconnect switch, including a transmission mechanism, conductive arms, and conductive switches. Two conductive arms are disposed opposite to each other on the transmission mechanism. The conductive switches are arranged in a one-to-one correspondence with the conductive arms. The two conductive arms intersect and are hinged at the intersection. The transmission mechanism includes a frame-shaped housing, a first rotating shaft, a second rotating shaft, a first linkage transmission mechanism, a second linkage transmission mechanism, a drive mechanism, and an elastic pull rod device with an adjustable disconnect switch clamping force as described above. The first rotating shaft is rotatably supported on the frame-shaped housing, and the second rotating shaft is rotatably supported on the frame-shaped housing. The fixed pull rod of the elastic pull rod device for adjustable disconnector clamping force is connected to the first end of the first linkage transmission mechanism. The second end of the first linkage transmission mechanism is connected to the first rotating shaft. The adjusting pull rod of the elastic pull rod device for adjustable disconnector clamping force is connected to the drive mechanism. The first end of the second linkage transmission mechanism is connected to the first rotating shaft. The second end of the second linkage transmission mechanism is connected to the second rotating shaft. One end of the first rotating shaft extends out of the frame-shaped housing and is connected to one of the conductive switches. One end of the second rotating shaft extends out of the frame-shaped housing and is connected to the other conductive switch.

[0011] Preferably, the first linkage transmission mechanism includes a first connecting block, an intermediate connecting block, and a first connecting shaft. The first connecting block and the intermediate connecting block are disposed opposite to each other at both ends of the first connecting shaft and are rotatably connected to the first connecting shaft. The other end of the first connecting block and the intermediate connecting block is connected to the first rotating shaft, and the adjusting rod is connected to the first connecting shaft.

[0012] Preferably, the second linkage transmission mechanism includes a second connecting block, a second connecting shaft, and a transmission rod. The second connecting block is located at the end of the intermediate connecting block away from the first connecting block. The second connecting block and the intermediate connecting block are connected to the second connecting shaft through a second internal threaded hole. The first end of the transmission rod is connected to the second connecting shaft, and the second end of the transmission rod is connected to the second rotating shaft.

[0013] Compared with the prior art, the elastic pull rod device and disconnecting switch with adjustable clamping force provided by the present invention have the following beneficial effects:

[0014] This invention provides an adjustable clamping force elastic pull rod device and an adjustable disconnector switch, comprising an adjusting pull rod, a screw plug, a compression spring, a spring sleeve, and a fixed pull rod. The adjusting pull rod, screw plug, spring sleeve, and fixed pull rod are coaxially arranged. The screw plug and fixed pull rod are positioned opposite each other at the two ends of the spring sleeve. The screw plug is threadedly connected to the first end of the spring sleeve, and the fixed pull rod is fixedly connected to the second end of the spring sleeve. The compression spring is located inside the spring sleeve, and the screw plug abuts against the first end of the compression spring. The first end of the adjusting pull rod abuts against the second end of the compression spring, and the second end of the adjusting pull rod passes through the compression spring and the screw plug and extends out of the screw plug. The second end of the adjusting pull rod is axially movably mounted on the screw plug. The elastic pull rod device provided by this invention, by setting an adjusting pull rod and a screw plug, and adjusting the screw plug thread depth to adjust the compression force of the compression spring, can further control the clamping state of the compression spring after the disconnector switch passes its dead point. The device has a simple structure and is easy to install. By controlling the length of the compression spring through the screw plug to adjust the compression force, it has the advantage of maintaining the ideal clamping state of the main disconnector switch. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the elastic tie rod device in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the adjusting rod in one embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the screw plug in one embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of a spring sleeve in one embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the fixed tie rod in one embodiment of the present invention;

[0021] Figure 6 This is one of the structural schematic diagrams of a disconnecting switch in one embodiment of the present invention;

[0022] Figure 7 This is a second schematic diagram of the structure of the disconnecting switch in one embodiment of the present invention;

[0023] Explanation of icon numbers:

[0024] Disconnecting switch 100; elastic pull rod device 10; adjusting pull rod 11; large diameter end 111; small diameter end 112; second internal threaded hole 113; screw plug 12; compression spring 13; fixed pull rod 14; third internal threaded hole 141; spring sleeve 15; connector 151; transmission mechanism 20; frame-type housing 21; first rotating shaft 22; second rotating shaft 23; first linkage transmission mechanism 24; second linkage transmission mechanism 25; drive mechanism 26; conductive arm 30; conductive knife switch 40.

[0025] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0029] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0030] Please refer to the appendix. Figures 1-7This invention provides an elastic pull rod device 10 with adjustable clamping force for an isolating switch, comprising an adjusting pull rod 11, a screw plug 12, a compression spring 13, a spring sleeve 15, and a fixed pull rod 14. The adjusting pull rod 11, the screw plug 12, the spring sleeve 15, and the fixed pull rod 14 are coaxially arranged. The screw plug 12 and the fixed pull rod 14 are disposed opposite to each other at both ends of the spring sleeve 15. The screw plug 12 is threadedly connected to the first end of the spring sleeve 15, and the fixed pull rod 14 is fixedly connected to the second end of the spring sleeve 15. The compression spring 13 is disposed inside the spring sleeve 15, and the screw plug 12 abuts against the first end of the compression spring 13. The first end of the adjusting pull rod 11 abuts against the second end of the compression spring 13, and the second end of the adjusting pull rod 11 passes through the compression spring 13 and the screw plug 12 and extends out of the screw plug 12. The second end of the adjusting pull rod 11 is axially movably disposed on the screw plug 12.

[0031] Specifically, the adjusting rod 11, the screw plug 12, the spring sleeve 15, and the fixed rod 14 are arranged coaxially to facilitate the setting of the compression spring 13. The screw plug 12 and the fixed rod 14 are respectively set opposite to each other at both ends of the spring sleeve 15. One end of the screw plug 12 is threadedly connected to one end of the spring sleeve 15. By adjusting the screw plug 12, the compression force of the compression spring 13 can be controlled. One end of the fixed rod 14 is fixedly connected to the second end of the spring sleeve 15.

[0032] A compression spring 13 is disposed inside a spring sleeve 15. The first end of an adjusting rod 11 extends into the spring sleeve 15, and the second end of the adjusting rod 11 passes through a screw plug 12 and extends out of the screw plug 12. The second end of the adjusting rod 11 is axially movably disposed on the screw plug 12. The compression spring 13 is sleeved on the outside of the adjusting rod 11. The first end of the compression spring 13 abuts against the screw plug 12, and the second end of the compression spring 13 abuts against the first end of the adjusting rod 11. By screwing in or out the screw plug 12, the compression amount of the compression spring 13 can be adjusted, thereby adjusting the compression force of the compression spring 13.

[0033] It should be understood that, such as Figure 7 Line A is the closing position line after reaching the dead point, and line B is the position line after reaching the dead point. The elastic pull rod device 10 is installed in the transmission mechanism 20 of the disconnecting switch. By setting the adjusting pull rod 11 and the screw plug 12, the compression force of the compression spring 13 is adjusted by adjusting the screw plug 12 thread insertion. The elastic pull rod device 10 can further control the compression spring 13 to remain in a clamped state after the disconnecting switch reaches the dead point. Moreover, the device has a simple structure and is easy to install. The compression force is adjusted by controlling the length of the compression spring 13 through the screw plug 12. It has the advantage of maintaining the ideal clamped state of the disconnecting switch main knife switch after reaching the dead point.

[0034] In a preferred embodiment of the present invention, the adjusting rod 11 is a T-shaped rod, the large-diameter end 111 of the adjusting rod 11 is disposed inside the spring sleeve 15, the second end of the compression spring 13 abuts against the large-diameter end 111 of the adjusting rod 11, and the small-diameter end 112 of the adjusting rod 11 passes through the compression spring 13 and the screw plug 12 in sequence and extends out of the screw plug 12. The central axis of the screw plug 12 is provided with a sliding guide hole (not shown in the figure) that cooperates with the small-diameter end 112.

[0035] In detail, the adjusting rod 11 is configured as a T-shaped rod, including a large-diameter end 111 and a small-diameter end 112 arranged opposite to each other. The large-diameter end 111 extends into the spring sleeve 15, and the small-diameter end 112 passes through the compression spring 13 and the screw plug 12 in sequence and extends out of the screw plug 12. The second end of the compression spring 13 abuts against the side of the large-diameter end 111 near the small-diameter end 112. A sliding guide hole is provided on the central axis of the screw plug 12. The small-diameter end 112 of the adjusting rod 11 passes through the sliding guide hole and is slidably engaged with the sliding guide hole.

[0036] In a preferred embodiment of the present invention, a connector 151 protrudes from the second end of the spring sleeve 15, the connector 151 has a first internal thread hole, the first end of the fixing rod 14 is an external thread end, and the first end of the fixing rod 14 is threadedly connected to the connector 151.

[0037] It should be noted that a connector 151 is protruding at the second end of the spring sleeve 15. The connector 151 is integrally formed with the spring sleeve 15. A first internal threaded hole is provided on the central axis of the connector 151. An external thread that mates with the first internal threaded hole is provided at the first end of the fixed pull rod 14. The first end of the fixed pull rod 14 is fixedly connected to the spring sleeve 15 through the connector 151. The connector 151 facilitates the connection of the fixed pull rod 14, has a simple structure, and can generate a large axial force when the thread is tightened. It can also easily achieve self-locking and better connect the fixed pull rod 14.

[0038] Furthermore, the screw plug 12 is made of aluminum.

[0039] It should be understood that the material of the screw plug 12 can be selected according to the actual situation. In this embodiment, the screw plug 12 is made of aluminum, which is not easy to fall off, so that the tightening torque does not change. At the same time, aluminum is not easy to rust.

[0040] In a preferred embodiment of the present invention, the second end of the adjusting rod 11 is provided with a second internal threaded hole 113, and the end of the fixing rod 14 away from the spring sleeve 15 is provided with a third internal threaded hole 141.

[0041] In detail, a second internal threaded hole 113 is provided at the second end of the adjusting rod 11, i.e., the free end of the adjusting rod 11, and a third internal threaded hole 141 is provided at the end of the fixed rod 14 away from the spring sleeve 15, i.e., the free end of the fixed rod 14. This makes it easier for the elastic rod device 10 to be installed in the disconnecting switch and connected to other structures. The structure is simple and easy to use.

[0042] The present invention also provides a high-voltage AC disconnect switch 100, including a transmission mechanism 20, conductive arms 30, and conductive switches 40. Two conductive arms 30 are disposed opposite to each other on the transmission mechanism 20. The conductive switches 40 are arranged in a one-to-one correspondence with the conductive arms 30. The two conductive arms 30 are intersecting and hinged at the intersection. The transmission mechanism 20 includes a frame-shaped housing 21, a first rotating shaft 22, a second rotating shaft 23, a first linkage transmission mechanism 24, a second linkage transmission mechanism 25, a drive mechanism 26, and an elastic pull rod device 10 with adjustable disconnect switch tension as described above. The first rotating shaft 22 is rotatably supported on the frame-shaped housing 21, and the second rotating shaft 23 is rotatably supported on the frame-shaped housing 21. 1. The fixed pull rod 14 of the elastic pull rod device 10 with adjustable disconnector clamping force is connected to the first end of the first linkage transmission mechanism 24, and the second end of the first linkage transmission mechanism 24 is connected to the first rotating shaft 22. The adjusting pull rod 11 of the elastic pull rod device 10 with adjustable disconnector clamping force is connected to the drive mechanism 26. The first end of the second linkage transmission mechanism 25 is connected to the first rotating shaft 22, and the second end of the second linkage transmission mechanism 25 is connected to the second rotating shaft 23. One end of the first rotating shaft 22 extends out of the frame-shaped housing 21 and is connected to one of the conductive switches 40. One end of the second rotating shaft 23 extends out of the frame-shaped housing 21 and is connected to another conductive switch 40.

[0043] Specifically, the conductive arm 30 includes an upper conductive arm 30 and a lower conductive arm 30. The lower end of the upper conductive arm 30 is connected to the lower conductive arm 30. The two upper conductive arms 30 are hinged at the intersection to form a scissor-type structure. The conductive switch 40 is provided on the conductive arm 30. The transmission mechanism 20 provides drive for the opening and closing of the disconnecting switch 100 and makes the lower conductive arm 30 open and close relative to each other. The lower conductive arm 30 drives the upper conductive arm 30 to complete the opening and closing of the disconnecting switch 100.

[0044] The elastic pull rod device 10 is located in the transmission mechanism 20. The connection between the adjusting pull rod 11 and the fixed pull rod 14 and other structures is through threaded universal bearings. Inside the frame-shaped housing, the drive mechanism 26 provides drive, which drives the elastic pull rod device 10 to reciprocate, thereby driving the first linkage transmission mechanism 24 and the second linkage transmission mechanism 25 to rotate, so as to complete the opening and closing of the disconnecting switch 100.

[0045] In use, the clamping force is coarsely adjusted by adjusting the screw thread of the plug 12, and then the clamping force is finely adjusted by controlling the compression of the compression spring 13 using the plug 12, so that the compression spring 13 maintains the clamping state after the switch passes the dead point. By adjusting the screw thread of the plug 12 to adjust the clamping force of the compression spring 13, the clamping spring 13 can be further controlled to maintain the clamping state after the disconnecting switch 100 passes the dead point. The device has a simple structure and is easy to install, and has the advantage of maintaining the ideal clamping state of the conductive knife 40 of the disconnecting switch 100.

[0046] In a preferred embodiment of the present invention, the first linkage transmission mechanism 24 includes a first connecting block (not shown in the figure), an intermediate connecting block (not shown in the figure), and a first connecting shaft (not shown in the figure). The first connecting block and the intermediate connecting block are disposed opposite to each other at both ends of the first connecting shaft and are rotatably connected to the first connecting shaft. The other ends of the first connecting block and the intermediate connecting block are connected to the first rotating shaft 22. The adjusting rod 11 is connected to the first connecting shaft.

[0047] In a preferred embodiment of the present invention, the second linkage transmission mechanism 25 includes a second connecting block (not shown in the figure), a second connecting shaft (not shown in the figure), and a transmission rod (not shown in the figure). The second connecting block is located at the end of the intermediate connecting block away from the first connecting block. The second connecting block and the intermediate connecting block are connected to the second connecting shaft through the second internal threaded hole 113. The first end of the transmission rod is connected to the second connecting shaft, and the second end of the transmission rod is connected to the second rotating shaft 23.

[0048] It is worth noting that the specific structure of the linkage transmission device can be set according to actual needs. In this embodiment, the first linkage transmission mechanism 24 and the second linkage transmission mechanism 25 are both set as structures with two connecting blocks connected to the connecting shaft. The second end of the transmission rod is also provided with this structure. The adjusting rod 11 and the transmission rod are set on the connecting shaft. In use, the first rotating shaft 22 and the second rotating shaft 23 are driven to rotate by adjusting the adjusting rod 11 and the transmission rod. The structure is simple and highly practical.

[0049] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An elastic pull rod device for adjusting the clamping force of an isolating switch, characterized in that, The device includes an adjusting rod, a screw plug, a compression spring, a spring sleeve, and a fixed rod. The adjusting rod, the screw plug, the spring sleeve, and the fixed rod are coaxially arranged. The screw plug and the fixed rod are positioned opposite each other at both ends of the spring sleeve. The screw plug is threadedly connected to the first end of the spring sleeve, and the fixed rod is fixedly connected to the second end of the spring sleeve. The compression spring is disposed inside the spring sleeve, the screw plug abuts against the first end of the compression spring, the first end of the adjusting rod abuts against the second end of the compression spring, the second end of the adjusting rod passes through the compression spring and the screw plug and extends out of the screw plug, and the second end of the adjusting rod is axially movably disposed on the screw plug.

2. The elastic pull rod device for adjusting the clamping force of the disconnect switch according to claim 1, characterized in that, The adjusting rod is a T-shaped rod. The large-diameter end of the adjusting rod is located inside the spring sleeve. The second end of the compression spring abuts against the large-diameter end of the adjusting rod. The small-diameter end of the adjusting rod passes through the compression spring and the screw plug in sequence and extends out of the screw plug. The central axis of the screw plug is provided with a sliding guide hole that mates with the small-diameter end.

3. The elastic pull rod device for adjusting the clamping force of the disconnect switch according to claim 1, characterized in that, The second end of the spring sleeve is provided with a connector, the connector is provided with a first internal thread hole, the first end of the fixed pull rod is an external thread end, and the first end of the fixed pull rod is threadedly connected to the connector.

4. The elastic pull rod device for adjusting the clamping force of the disconnect switch according to claim 1, characterized in that, The screw plug is made of aluminum.

5. The elastic pull rod device for adjusting the clamping force of the disconnect switch according to claim 1, characterized in that, The second end of the adjusting rod has a second internal threaded hole, and the end of the fixed rod away from the spring sleeve has a third internal threaded hole.

6. A high-voltage AC disconnect switch, characterized in that, The device includes a transmission mechanism, conductive arms, and conductive switches. Two conductive arms are mounted opposite each other on the transmission mechanism. The conductive switches are arranged in a one-to-one correspondence with the conductive arms. The two conductive arms intersect and are hinged at the intersection. The transmission mechanism includes a frame-shaped housing, a first rotating shaft, a second rotating shaft, a first linkage transmission mechanism, a second linkage transmission mechanism, a drive mechanism, and an elastic pull rod device with an adjustable disconnector clamping force as described in any one of claims 1-5. The first rotating shaft is rotatably supported on the frame-shaped housing, and the second rotating shaft is rotatably supported on the frame-shaped housing. The fixed pull rod of the elastic pull rod device for adjusting the clamping force of the disconnect switch is connected to the first end of the first linkage transmission mechanism, and the second end of the first linkage transmission mechanism is connected to the first rotating shaft. The adjusting pull rod of the elastic pull rod device for adjusting the clamping force of the disconnect switch is connected to the drive mechanism. The first end of the second linkage transmission mechanism is connected to the first rotating shaft, and the second end of the second linkage transmission mechanism is connected to the second rotating shaft. One end of the first rotating shaft extends out of the frame-shaped box and is connected to one of the conductive switches, and one end of the second rotating shaft extends out of the frame-shaped box and is connected to another conductive switch.

7. The high-voltage AC disconnect switch according to claim 6, characterized in that, The first linkage transmission mechanism includes a first connecting block, an intermediate connecting block, and a first connecting shaft. The first connecting block and the intermediate connecting block are disposed opposite to each other at both ends of the first connecting shaft and are rotatably connected to the first connecting shaft. The other end of the first connecting block and the intermediate connecting block is connected to the first rotating shaft. The adjusting rod is connected to the first connecting shaft.

8. The high-voltage AC disconnect switch according to claim 7, characterized in that, The second linkage transmission mechanism includes a second connecting block, a second connecting shaft, and a transmission rod. The second connecting block is located at the end of the intermediate connecting block away from the first connecting block. The second connecting block and the intermediate connecting block are connected to the second connecting shaft through a second internal threaded hole. The first end of the transmission rod is connected to the second connecting shaft, and the second end of the transmission rod is connected to the second rotating shaft.

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