An outdoor high voltage AC vacuum circuit breaker

Abstract

The present invention relates to the field of circuit breakers, and in particular, to an outdoor high-voltage AC vacuum circuit breaker, which comprises an upper shell, the bottom of which is fixedly connected to a lower shell, the top inner wall of which is provided with a support frame, and the inner bottom of which is fixedly connected to a maintenance assembly for replacing a bellows. In the outdoor high-voltage AC vacuum circuit breaker, a No. 1 rotating rod is driven by a No. 1 motor to rotate together with a No. 1 connecting rod, and the No. 1 connecting rod pulls the No. 2 connecting rod, so that the sliding plate, the No. 1 sliding rod and the No. 2 sliding rod slide to the left in the sliding groove, and are restricted by the L-shaped hole and the arch hole, and slide to the lower end of the L-shaped rod. At this time, under the sliding of the No. 2 sliding rod, the No. 3 connecting rod is driven to pull the No. 4 connecting rod and the sliding plate downward, and the bellows in the vacuum arc chamber are taken out for replacement, so that the bellows can be replaced even without disassembling the vacuum arc chamber.

Description

Technical Field

[0001] The present invention relates to the field of circuit breakers, and more specifically, to an outdoor high-voltage AC vacuum circuit breaker. Background Art

[0002] High-voltage vacuum circuit breakers are one of the crucial devices in the power system. Their main functions are to connect, carry, and break the current in the power system, and to break the current under specified abnormal current conditions, such as short-circuit current. Such circuit breakers have been widely used in the power industry due to their unique vacuum arc extinguishing chamber structure;

[0003] Chinese Publication No.: CN104299839A discloses an outdoor high-voltage AC vacuum circuit breaker, including a housing and a lifting device installed on the top of the housing. The lifting device includes a lifting plate, a first mounting plate fixed to one end of the lifting plate and detachably and fixedly connected to the housing, and a second mounting plate slidably mounted on the other end of the lifting plate. A driving mechanism is provided on the lifting plate to drive the second mounting plate to approach the first mounting plate to clamp and fix the top of the housing or drive the second mounting plate away from the first mounting plate to release the fixing effect on the top of the housing. According to the circuit breaker housing of different width specifications, the distance between the first mounting plate and the second mounting plate is adjusted, and the first mounting plate and the second mounting plate clamp the housing, so that the lifting device is fixed on the top of the housing. The present invention can be applicable to the lifting of circuit breakers of different width specifications, has stronger applicability, and better meets the market demand;

[0004] Although the above patent uses the first mounting plate and the second mounting plate to clamp the housing to fix the lifting device on the top of the housing, with stronger applicability and better meeting the market demand, considering that the vacuum circuit breaker is an exposed device, under long-term exposure to wind, sun, rain, etc., the bellows used to provide the movement and sealing functions of the moving electrode during the opening and closing processes will age and be damaged, resulting in problems such as a decline in device performance, and it is more inconvenient to repair.

[0005] In view of this, we propose an outdoor high-voltage AC vacuum circuit breaker. Summary of the Invention

[0006] The purpose of the present invention is to provide an outdoor high-voltage AC vacuum circuit breaker to solve the problems raised in the above background art.

[0007] To achieve the above purpose, on the one hand, the present invention provides an outdoor high-voltage AC vacuum circuit breaker, including an upper housing. The bottom of the upper housing is fixedly connected to a lower housing. A support frame is provided on the inner top wall of the lower housing. A maintenance component for replacing the bellows is fixedly connected to the inner bottom of the lower housing. A second sliding rod for pulling the bellows is provided inside the maintenance component. A disassembly and assembly component for disassembling and assembling the upper housing and the lower housing is provided on one side of the support frame, where:

[0008] The maintenance component slides and the second sliding rod is used to complete the maintenance of the bellows, while the disassembly and assembly component is used to complete the disassembly and assembly of the upper shell and the lower shell.

[0009] As a preferred embodiment of the present invention, the inner wall of the upper shell is provided with a No. 1 protrusion block, the lower shell is fixedly connected to the inner wall on the same side of the upper shell with a No. 2 protrusion block, the top of the upper shell is fixedly connected to a vacuum arc extinguishing chamber, and the support frame is fixedly connected to the bottom of the inner wall of the lower shell.

[0010] As a preferred embodiment of the present invention, an L-shaped hole is provided on one side of the support frame, a sliding groove is provided on the side close to the L-shaped hole, a square hole is provided on the side away from the L-shaped hole, and a fixing column is fixedly connected to the top of the support frame.

[0011] As a preferred embodiment of the present invention, the maintenance component includes a No. 1 motor, the output end of the No. 1 motor is fixedly connected to a No. 1 rotating rod, the No. 1 rotating rod is rotatably connected to the upper outer wall of the fixed column, and the No. 1 rotating rod passes through the fixed column, the No. 1 rotating rod is rotatably connected to a No. 1 connecting rod at the end away from the No. 1 motor, the No. 1 connecting rod is rotatably connected to a No. 2 connecting rod at the end away from the No. 1 rotating rod, and the No. 2 connecting rod is rotatably connected to a sliding plate at the end away from the No. 1 rotating rod.

[0012] As a preferred embodiment of the present invention, the sliding plate is slidably connected in the sliding groove, and an arched hole is opened on the outer wall of the sliding plate, and the width of the arched hole matches the width of the L-shaped hole.

[0013] As a preferred embodiment of the present invention, the L-shaped hole and the lower end of the arched hole are slidably connected to a sliding rod No. 1, one end of the sliding rod No. 1 is fixedly connected to a sliding rod No. 2, the middle end of the sliding rod No. 2 is rotatably connected to a connecting rod No. 3, and the connecting rod No. 3 is rotatably connected to a connecting rod No. 4 at the end away from the sliding rod No. 2.

[0014] As a preferred embodiment of the present invention, a sliding disk is provided at one end of the fourth connecting rod away from the third connecting rod, the fourth connecting rod is rotatably connected to the bottom of the sliding disk, and the sliding disk is slidably connected to the vacuum arc chamber.

[0015] As a preferred embodiment of the present invention, the disassembly and assembly component includes a No. 2 motor, the output end of the No. 2 motor is fixedly connected to a No. 2 rotating rod, the middle end of the No. 2 rotating rod is fixedly connected to a turntable, the outer wall of the turntable is sleeved with a No. 5 connecting rod, the No. 2 rotating rod is provided with a telescopic column on the outer wall of the end away from the No. 2 motor, and the No. 2 rotating rod is provided with a T-shaped column on the outer wall of the end close to the No. 2 motor.

[0016] Preferably in the present invention, a snap rod is provided at one end of the second rotating rod away from the second motor. The second rotating rod is slidably connected to one side of the snap rod at the end away from the second motor. Snap grooves are formed at both ends of the snap rod, and the widths of the snap grooves match those of the first raised block and the second raised block.

[0017] Preferably in the present invention, a sixth connecting rod is rotatably connected to the outer wall of the second rotating rod between the turntable and the T-shaped column. The seventh connecting rod is rotatably connected to the end of the sixth connecting rod away from the second rotating rod. The eighth connecting rod is rotatably connected to the end of the seventh connecting rod away from the sixth connecting rod. The end of the eighth connecting rod away from the seventh connecting rod is rotatably connected to the end of the fifth connecting rod away from the turntable.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In this outdoor high-voltage AC vacuum circuit breaker, driven by the first motor, the first rotating rod and the first connecting rod rotate together. The first connecting rod pulls the second connecting rod, causing the sliding plate, the first sliding rod, and the second sliding rod to slide leftward in the sliding groove. Restricted by the L-shaped hole and the arched hole together, they will slide downward to the lower end of the L-shaped rod. At this time, driven by the sliding of the second sliding rod, it will drive the third connecting rod to pull the fourth connecting rod and the sliding disc downward, and take out the bellows in the vacuum interrupter for replacement. This makes it possible to replace the bellows without disassembling the vacuum interrupter.

[0020] 2. In this outdoor high-voltage AC vacuum circuit breaker, driven by the second motor, the second rotating rod and the turntable rotate together. During the rotation of the turntable, the distance between the two ends of the fifth connecting rod will change continuously. When the distance between the two ends of the fifth connecting rod becomes larger, it will drive the sixth connecting rod, the seventh connecting rod, and the eighth connecting rod to tilt to the right by a certain angle. This makes the seventh connecting rod drive the second sliding rod to abut against the rightmost end of the L-shaped rod and be fixed at the lower end end position of the L-shaped hole to prevent the second sliding rod from shaking.

[0021] 3. In this outdoor high-voltage AC vacuum circuit breaker, driven by the second rotating rod, the snap rod will also rotate by a certain angle. At this time, during the rotation of the snap rod, the first raised block and the second raised block will be misaligned in the snap groove, and the first raised block and the second raised block will be separated from the snap groove. Then, the staff separates the upper housing and the lower housing and replaces the bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an overall three-dimensional schematic diagram of the outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0023] Figure 2 is an overall sectional schematic diagram of the outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0024] Figure 3 It is a schematic diagram of the internal details of the outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0025] Figure 4 It is a schematic internal stereoscopic diagram of an outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0026] Figure 5 It is a three-dimensional schematic diagram of a maintenance component of an outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0027] Figure 6 It is a three-dimensional schematic diagram of the maintenance components of the outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0028] Figure 7 It is a three-dimensional schematic diagram of the disassembly and assembly components of the outdoor high-voltage AC vacuum circuit breaker of the present invention;

[0029] The meaning of each number in the figure is:

[0030] 1. Upper shell; 11. No. 1 raised block; 12. Lower shell; 121. No. 2 raised block; 13. Vacuum interrupter; 14. Support frame; 141. L-shaped hole; 142. Sliding groove; 143. Square hole; 144. Fixed column; 2. Maintenance assembly; 21. No. 1 motor; 22. No. 1 rotating rod; 23. No. 1 connecting rod; 24. No. 2 connecting rod; 25. Sliding plate; 251. Arched hole; 26. No. 1 sliding rod; 261. No. 2 sliding rod; 262. No. 3 connecting rod; 263. No. 4 connecting rod; 27. Sliding plate;

[0031] 3. Disassembly and assembly components; 31. Motor No. 2; 32. Rotating rod No. 2; 321. Buckle rod; 322. Buckle slot; 33. Connecting rod No. 5; 331. Turntable; 34. T-shaped column; 35. Telescopic column; 36. Connecting rod No. 6; 37. Connecting rod No. 7; 38. Connecting rod No. 8. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] Example 1: Please refer to Figure 1-Figure 7 As shown, this embodiment provides an outdoor high-voltage AC vacuum circuit breaker, including an upper shell 1, the bottom of the upper shell 1 is fixedly connected to a lower shell 12, the top inner wall of the lower shell 12 is provided with a support frame 14, the inner bottom of the lower shell 12 is fixedly connected to a maintenance component 2 for replacing the bellows, the maintenance component 2 is provided with a second sliding rod 261 for pulling the bellows, and one side of the support frame 14 is provided with a disassembly component 3 for disassembling and assembling the upper shell 1 and the lower shell 12, wherein: the maintenance component 2 is slid, the second sliding rod 261 is used to complete the maintenance of the bellows, and the disassembly component 3 is used to complete the disassembly and assembly of the upper shell 1 and the lower shell 12.

[0035] like Figure 2-Figure 3 As shown, the inner wall of the upper shell 1 is provided with a No. 1 protrusion block 11, the lower shell 12 is fixedly connected to a No. 2 protrusion block 121 on the inner wall on the same side of the upper shell 1, the top of the upper shell 1 is fixedly connected to a vacuum arc extinguishing chamber 13, the support frame 14 is fixedly connected to the bottom of the inner wall of the lower shell 12, an L-shaped hole 141 is opened on one side of the support frame 14, a sliding groove 142 is opened on the side of the support frame 14 close to the L-shaped hole 141, a square hole 143 is opened on the side of the support frame 14 away from the L-shaped hole 141, and a fixing column 144 is fixedly connected to the top of the support frame 14.

[0036] like Figure 4-Figure 6As shown, the maintenance component 2 includes a No. 1 motor 21, the output end of the No. 1 motor 21 is fixedly connected to a No. 1 rotating rod 22, the No. 1 rotating rod 22 is rotatably connected to the upper outer wall of the fixed column 144, and the No. 1 rotating rod 22 passes through the fixed column 144, the No. 1 rotating rod 22 is rotatably connected to a No. 1 connecting rod 23 at the end away from the No. 1 motor 21, the No. 1 connecting rod 23 is rotatably connected to a No. 2 connecting rod 24 at the end away from the No. 1 rotating rod 22, the No. 2 connecting rod 24 is rotatably connected to a sliding plate 25 at the end away from the No. 1 rotating rod 22, the sliding plate 25 is slidably connected in the sliding groove 142, and the outer wall of the sliding plate 25 is provided with an arched hole 251, and the width of the arched hole 251 is the same as the L-shaped hole 14 1, the L-shaped hole 141 and the lower end of the arch hole 251 are slidably connected with a No. 1 sliding rod 26, one end of the No. 1 sliding rod 26 is fixedly connected with a No. 2 sliding rod 261, the middle end of the No. 2 sliding rod 261 is rotatably connected with a No. 3 connecting rod 262, the No. 3 connecting rod 262 is rotatably connected with a No. 4 connecting rod 263 at one end away from the No. 2 sliding rod 261, the No. 4 connecting rod 263 is provided with a sliding disk 27 at one end away from the No. 3 connecting rod 262, the No. 4 connecting rod 263 is rotatably connected to the bottom of the sliding disk 27, the sliding disk 27 is slidably connected to the vacuum interrupter 13, a magnet is installed at the end of the No. 2 sliding rod 261, and the No. 7 connecting rod 37 is made of magnetic metal.

[0037] From this we can see that Figure 4-Figure 6 As shown, under the drive of the No. 1 motor 21, the No. 1 rotating rod 22 rotates together with the No. 1 connecting rod 23, and the No. 2 connecting rod 24 is pulled and pushed by the rotation of the No. 1 connecting rod 23, so that the sliding plate 25 slides left and right in the sliding groove 142. At this time, when the No. 1 connecting rod 23 pulls the No. 2 connecting rod 24, the sliding plate 25 slides to the left, and drives the No. 1 sliding rod 26 and the No. 2 sliding rod 261 to slide to the left together, and the No. 1 sliding rod 26 and the No. 2 sliding rod 261 slide to the left end of the L-shaped hole 141. At the end, under the joint restriction of the L-shaped hole 141 and the arch hole 251, the No. 1 sliding rod 26 and the No. 2 sliding rod 261 will slide downward together until they slide to the lower end position of the L-shaped hole 141. At this time, the sliding of the No. 2 sliding rod 261 will drive the No. 3 connecting rod 262 to pull the No. 4 connecting rod 263 and the sliding plate 27 downward, and bring the bellows in the vacuum arc chamber 13 out for replacement, which makes it possible to replace the bellows even without disassembling the vacuum arc chamber 13.

[0038] Embodiment 2: Different from Embodiment 1, in order to realize the disassembly and assembly between the upper shell 1 and the lower shell 12, as shown in FIG. Figure 7As shown, the disassembly assembly 3 includes a No. 2 motor 31, a No. 2 rotating rod 32 is fixedly connected to the output end of the No. 2 motor 31, a No. 2 rotating rod 32 is fixedly connected to the middle end of the No. 2 rotating rod 32, a No. 5 connecting rod 33 is sleeved on the outer wall of the rotating disk 331, a telescopic column 35 is arranged on the outer wall of the No. 2 rotating rod 32 at the end away from the No. 2 motor 31, a T-shaped column 34 is arranged on the outer wall of the No. 2 rotating rod 32 at the end close to the No. 2 motor 31, a buckle rod 321 is arranged at the end of the No. 2 rotating rod 32 at the end away from the No. 2 motor 31, and the No. 2 rotating rod 32 is slidably connected to the buckle rod 321 at the end away from the No. 2 motor 31 On one side of 321, both ends of the snap rod 321 are provided with a snap groove 322, and the snap groove 322 matches the width of the No. 1 protrusion block 11 and the No. 2 protrusion block 121. The No. 2 rotating rod 32 is rotatably connected to the No. 6 connecting rod 36 on the outer wall between the rotating disk 331 and the T-shaped column 34, the No. 6 connecting rod 36 is rotatably connected to the No. 7 connecting rod 37 at the end away from the No. 2 rotating rod 32, the No. 7 connecting rod 37 is rotatably connected to the No. 8 connecting rod 38 at the end away from the No. 6 connecting rod 36, and the No. 8 connecting rod 38 is rotatably connected to the end of the No. 5 connecting rod 33 away from the rotating disk 331 at the end away from the No. 7 connecting rod 37.

[0039] From this we can see that Figure 6-Figure 7 As shown, the No. 2 rotating rod 32 rotates under the drive of the No. 2 motor 31, and the No. 2 rotating rod 32 will drive the rotating disk 331 to rotate during the rotation process, and the distance between the two ends of the No. 5 connecting rod 33 will change continuously during the rotation of the rotating disk 331. When the distance between the two ends of the No. 5 connecting rod 33 becomes larger, the No. 6 connecting rod 36, the No. 7 connecting rod 37 and the No. 8 connecting rod 38 will be driven to tilt to the right by a certain angle, and vice versa, they will be tilted to the left by a certain angle, which makes the No. 7 connecting rod 37 drive the No. 2 sliding rod 261 to abut against the rightmost end of the L-shaped hole 141, and then when the No. 2 connecting rod 24 in the first embodiment pulls the sliding plate 25 to slide to the left, the entire disassembly assembly 3 will be driven to slide to the left together, and fixed at the lower end position of the L-shaped hole 141 to prevent the No. 2 sliding rod 261 from shaking;

[0040] At the same time, driven by the second rotating rod 32, the buckle rod 321 will also rotate a certain angle. At this time, the buckle rod 321 will cause the first protrusion block 11 and the second protrusion block 121 to be misaligned in the buckle groove 322 during the rotation process, and the first protrusion block 11 and the second protrusion block 121 will be separated from the buckle groove 322. Then the staff will separate the upper shell 1 and the lower shell 12 and replace the bellows.

[0041] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An outdoor high-voltage AC vacuum circuit breaker, comprising an upper housing (1), characterized in that: The bottom of the upper shell (1) is fixedly connected to the lower shell (12), the top inner wall of the lower shell (12) is provided with a support frame (14), the inner bottom of the lower shell (12) is fixedly connected to a maintenance component (2) for replacing the bellows, a second sliding rod (261) for pulling the bellows is provided in the maintenance component (2), and a disassembly component (3) for disassembling the upper shell (1) and the lower shell (12) is provided on one side of the support frame (14), wherein: The maintenance component (2) slides and the second sliding rod (261) is used to complete the maintenance of the bellows, while the disassembly component (3) is used to complete the disassembly and assembly of the upper shell (1) and the lower shell (12).

2. An outdoor high voltage AC vacuum circuit breaker according to claim 1, characterized in that: The inner wall of the upper shell (1) is provided with a No. 1 protrusion (11), the lower shell (12) is fixedly connected to a No. 2 protrusion (121) on the inner wall on the same side of the upper shell (1), the top of the upper shell (1) is fixedly connected to a vacuum arc extinguishing chamber (13), and the support frame (14) is fixedly connected to the bottom of the inner wall of the lower shell (12).

3. An outdoor high voltage AC vacuum circuit breaker according to claim 2, characterized in that: An L-shaped hole (141) is provided on one side of the support frame (14), a sliding groove (142) is provided on a side of the support frame (14) close to the L-shaped hole (141), a square hole (143) is provided on a side of the support frame (14) away from the L-shaped hole (141), and a fixing column (144) is fixedly connected to the top of the support frame (14).

4. An outdoor high-voltage AC vacuum circuit breaker according to claim 3, characterized in that: The maintenance component (2) includes a No. 1 motor (21), the output end of the No. 1 motor (21) is fixedly connected to a No. 1 rotating rod (22), the No. 1 rotating rod (22) is rotatably connected to the upper outer wall of the fixed column (144), and the No. 1 rotating rod (22) passes through the fixed column (144), the No. 1 rotating rod (22) is rotatably connected to a No. 1 connecting rod (23) at an end away from the No. 1 motor (21), the No. 1 connecting rod (23) is rotatably connected to a No. 2 connecting rod (24) at an end away from the No. 1 rotating rod (22), and the No. 2 connecting rod (24) is rotatably connected to a sliding plate (25) at an end away from the No. 1 rotating rod (22).

5. An outdoor high voltage AC vacuum circuit breaker according to claim 4, characterized in that: The sliding plate (25) is slidably connected in the sliding groove (142); an arched hole (251) is provided on the outer wall of the sliding plate (25); and the width of the arched hole (251) matches the width of the L-shaped hole (141).

6. An outdoor high voltage AC vacuum circuit breaker according to claim 5, characterized in that: The lower ends of the L-shaped hole (141) and the arched hole (251) are slidably connected to a first sliding rod (26); one end of the first sliding rod (26) is fixedly connected to a second sliding rod (261); the middle end of the second sliding rod (261) is rotatably connected to a third connecting rod (262); and the third connecting rod (262) is rotatably connected to a fourth connecting rod (263) at one end away from the second sliding rod (261).

7. An outdoor high voltage AC vacuum circuit breaker according to claim 6, characterized in that: The fourth connecting rod (263) is provided with a sliding disk (27) at one end away from the third connecting rod (262); the fourth connecting rod (263) is rotatably connected to the bottom of the sliding disk (27); and the sliding disk (27) is slidably connected to the vacuum interrupter (13).

8. An outdoor high-voltage AC vacuum circuit breaker according to claim 7, characterized in that: The disassembly assembly (3) includes a No. 2 motor (31), the output end of the No. 2 motor (31) is fixedly connected to a No. 2 rotating rod (32), the middle end of the No. 2 rotating rod (32) is fixedly connected to a rotating disk (331), the outer wall of the rotating disk (331) is sleeved with a No. 5 connecting rod (33), the outer wall of the No. 2 rotating rod (32) at an end away from the No. 2 motor (31) is provided with a telescopic column (35), and the outer wall of the No. 2 rotating rod (32) at an end close to the No. 2 motor (31) is provided with a T-shaped column (34).

9. An outdoor high-voltage AC vacuum circuit breaker according to claim 8, characterized in that: The second rotating rod (32) is provided with a buckle rod (321) at one end away from the second motor (31), and the second rotating rod (32) is slidably connected to one side of the buckle rod (321) at one end away from the second motor (31), and buckle grooves (322) are provided at both ends of the buckle rod (321), and the buckle grooves (322) match the widths of the first protruding block (11) and the second protruding block (121).

10. An outdoor high voltage AC vacuum circuit breaker according to claim 9, characterized in that: The second rotating rod (32) is rotatably connected to a sixth connecting rod (36) on the outer wall between the rotating disk (331) and the T-shaped column (34); the sixth connecting rod (36) is rotatably connected to a seventh connecting rod (37) at one end away from the second rotating rod (32); the seventh connecting rod (37) is rotatably connected to an eighth connecting rod (38) at one end away from the sixth connecting rod (36); and the eighth connecting rod (38) is rotatably connected to an end of the fifth connecting rod (33) away from the rotating disk (331) at one end away from the seventh connecting rod (37).

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