Electric car coupler pushing device

Abstract

The invention relates to an electric car coupler pushing device which comprises a supporting frame, a driving mechanism and a pushing mechanism. Wherein the driving mechanism is fixed on the support frame and comprises a mounting end and a power output end; the pushing mechanism comprises a first connecting rod, a second connecting rod and a force transmission piece; the first connecting rod and the second connecting rod are coupled with one end of the force transmission piece; the other end of the first connecting rod is coupled with the support frame; the other end of the second connecting rod is coupled with the power output end; the other end of the force transmission piece is coupled with the electric car coupler; when the power output end extends to the maximum stroke position, the first connecting rod, the second connecting rod and the force transmission piece form a self-locking structure. According to the electric coupler pushing device, the acting force on the electric coupler is in the horizontal direction, the problem that the electric coupler is blocked due to the fact that upward or downward component force is generated is avoided, meanwhile, after the electric coupler is pushed out, mechanical self-locking of the connecting rod mechanism can be conducted, and the situation that the electric coupler is stressed to return is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rail vehicles, and particularly relates to an electric coupler pushing device. BACKGROUND

[0002] With the development of rail transit technology, the control function of rail vehicles is increasingly complex, and the number of electrical components integrated at the front end of the vehicle body has significantly increased, resulting in a significant compression of the installation space of the coupler buffer device. Especially in the middle section area of the vehicle, the installation of the coupler buffer device is limited by factors such as the overhead vehicle through passage or the lower height limit, so when installing the electric coupler in the middle section area of the vehicle, the requirement for the compactness of the pushing device structure is also more stringent.

[0003] The existing electric coupler pushing device mainly has two typical structures of self-locking cylinder straight pushing type structure and self-locking inclined pushing type mechanism. Among them, the cylinder straight pushing type structure principle is relatively simple, has fewer parts and higher reliability, but its self-locking function depends on the lock pin inside the cylinder to realize, which has the risk of unlocking failure, and is not suitable for electric couplers with large coupling force values. The self-locking inclined pushing mechanism realizes rigid self-locking through a mechanical lever, has strong bearing capacity, and can adapt to high coupling force value scenes, but during the pushing process of the electric coupler, it will cause the electric coupler to bear upward or downward component force, thereby causing the electric coupler to bear a larger friction force, which is easy to cause pushing jamming failure. SUMMARY

[0004] The purpose of the present application is to solve one of the above technical problems, and to provide an electric coupler pushing device which will perform a connecting rod mechanism self-locking after the electric coupler is pushed into place, has no risk of unlocking failure, and the electric coupler bears a horizontal force during the pushing process, without upward and downward component force, so that the electric coupler is more reliable in coupling and can bear a larger force.

[0005] To achieve the above purpose, the technical solution adopted by the present application is: An electric coupler pushing device, comprising: a support frame; a driving mechanism comprising a mounting end and a power output end; the mounting end is fixed on the support frame; the power output end is telescopically arranged relative to the mounting end; a pushing mechanism comprising a first connecting rod, a second connecting rod and a force transmission member; one end of the first connecting rod, one end of the second connecting rod and one end of the force transmission member are shaft-connected; the other end of the first connecting rod is shaft-connected with the support frame; the other end of the second connecting rod is shaft-connected with the power output end; the other end of the force transmission member is shaft-connected with the electric coupler; During the extension of the power output end, the first connecting rod, the second connecting rod and the force transmission member are relatively rotated; when the power output end is extended to the maximum stroke position, the first connecting rod, the second connecting rod and the force transmission member form a self-locking structure.

[0006] In some embodiments of the present application, when the power output end is extended to the maximum stroke position, the electric car hook is driven to extend to the position by the pushing mechanism, and is connected with the electric car hook on the opposite side to receive the force from the electric car hook on the opposite side, the force is transmitted to the force transmission member, the first connecting rod and the second connecting rod have a tendency to move away from the longitudinal center line of the electric car hook, and are kept in the original position under the limitation of the power output end, so as to form a self-locking structure.

[0007] In some embodiments of the present application, when the power output end is extended to the maximum stroke position, the first connecting rod and the force transmission member form a predetermined angle on one side of the longitudinal center line of the electric car hook, and the predetermined angle is less than 180°.

[0008] In some embodiments of the present application, during the extension of the power output end, the second connecting rod is driven to rotate around the connecting point of the first connecting rod, the second connecting rod and the force transmission member, at the same time, the first connecting rod is driven to rotate away from the longitudinal center line of the electric car hook around the connecting point of the first connecting rod and the support frame, and the force transmission member is driven to rotate away from the longitudinal center line of the electric car hook around the connecting point of the force transmission member and the electric car hook.

[0009] In some embodiments of the present application, during the extension of the power output end, the second connecting rod is driven to rotate around the connecting point of the first connecting rod, the second connecting rod and the force transmission member, at the same time, the first connecting rod is driven to rotate away from the longitudinal center line of the electric car hook around the connecting point of the first connecting rod and the support frame, and the force transmission member is driven to rotate away from the longitudinal center line of the electric car hook around the connecting point of the force transmission member and the electric car hook.

[0010] In some embodiments of the present application, a guide part is arranged on the electric car hook. The pushing mechanism further comprises a guide rod, the guide rod is arranged in parallel to the longitudinal center line of the electric car hook, one end of the guide rod is fixed to the support frame, and the other end of the guide rod penetrates through the guide part, so that the electric car hook moves along the guide rod during the extension and retraction of the electric car hook.

[0011] In some embodiments of the present application, the pushing mechanism further comprises an elastic member, the elastic member is sleeved on the outside of the force transmission member or the first connecting rod.

[0012] In some embodiments of the present application, the support frame comprises a pushing support and a driving installation support. The pushing mechanism is installed on the pushing support, the driving mechanism is installed on the driving installation support, and the pushing support and the driving installation support are movably connected through the elastic member.

[0013] In some embodiments of the present application, the pushing mechanism comprises two groups, and the two groups of pushing mechanisms are symmetrically arranged relative to the longitudinal center line of the electric car hook.

[0014] In some embodiments of the present application, the auxiliary driving mechanism is connected with the power output end, and the auxiliary driving mechanism drives the power output end to extend or retract when rotating.

[0015] In some embodiments of the present application, the auxiliary driving mechanism comprises a third connecting rod and a rotating arm, the third connecting rod and the rotating arm are connected, one end of the third connecting rod away from the rotating arm is connected with the power output end, and the other end of the rotating arm away from the third connecting rod is connected with the support frame.

[0016] The present application has the following beneficial effects: 1. The pushing mechanism provided by the present application can effectively avoid the problem of the electric car hook being stuck, because the force acting on the electric car hook during the process of pushing out and retracting the electric car hook is in the front-back direction of the horizontal plane, and no upward or downward component force is generated. 2. After the electric car hook is pushed out by the pushing mechanism provided by the present application, the mechanical self-locking of the connecting rod mechanism can ensure that the electric car hook will not retreat when bearing a large force.

[0017] Other features and advantages of the present application will be described in the following specification, and some will become apparent from the specification, or will be understood from the practice of the present application. The purposes and other advantages of the present application can be achieved and obtained by the structures indicated in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described in detail below with reference to the drawings, and other drawings can also be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0019] Figure 1 FIG. 1 is a structural schematic view of an electric car hook pushing device according to the present application; Figure 2 FIG. 2 is a structural schematic view of the electric car hook pushing device from another angle according to the present application; Figure 3 FIG. 3 is a side view of the electric car hook pushing device according to the present application; Figure 4 FIG. 4 is a top view of the electric car hook pushing device according to the present application; Figure 5 FIG. 5 is a structural schematic view of the electric car hook pushing device in an extended state according to the present application; Figure 6 FIG. 6 is a top view of the electric car hook pushing device in an extended state according to the present application; Figure 7 FIG. 7 is a force diagram of the electric car hook pushing device in an extended state according to the present application; Figure 8 FIG. 8 is a structural schematic view of the electric car hook pushing device in a retracted state according to the present application; Figure 9 Fig. 6 is a plan view of the electric car coupler pusher device in the retracted state; Figure 10 Fig. 7 is a force diagram of the electric car coupler pusher device in the retracted state; Figure 11 Fig. 8 is a schematic view of one installation position of the elastic member; Figure 12 Fig. 9 is a schematic view of another installation position of the elastic member; Wherein, the reference signs are: 1. Electric car coupler; 11. Guide part; 2. Support frame; 21. Pushing support; 22. Rear panel; 23. Driving installation support; 24. Stop block; 25. Trunnion seat; 3. Driving mechanism; 31. Installation end; 32. Power output end; 4. Pushing mechanism; 41. First connecting rod; 42. Second connecting rod; 43. Connecting block; 44. First pin; 45. Force transmission member; 46. Elastic member; 5. Guide rod; 6. Auxiliary driving mechanism; 61. Third connecting rod; 62. Swivel arm; 7. Car coupler longitudinal center line. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is described and explained below in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0021] It should be noted that the terms used here are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0022] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0023] The technical solutions of the present application will be described in detail below in combination with specific embodiments and the accompanying drawings. Unless otherwise specified, "inner" and "outer" in the following refer to the car coupler longitudinal center line 7, and "inner" means close to the car coupler longitudinal center line 7, and "outer" means away from the car coupler longitudinal center line 7.

[0024] As shown in the accompanying drawings, in one illustrative embodiment of the electric car coupler 1 pushing device of the present application, the pushing device comprises a support frame 2, a driving mechanism 3 and a pushing mechanism 4. Figure 1 - The accompanying Figure 12 As shown in the accompanying drawings, in one illustrative embodiment of the electric car coupler 1 pushing device of the present application, the pushing device comprises a support frame 2, a driving mechanism 3 and a pushing mechanism 4.

[0025] The support frame 2 is the basic support component of the pushing device, which provides a platform for the installation and fixation of other mechanisms. The support frame 2 comprises a pushing bracket 21 and a driving installation bracket 23. The pushing bracket 21 is fixed above the electric car coupler 1, and the end close to the driving mechanism 3 is provided with a rear panel 22. The driving installation bracket 23 is fixedly connected with the pushing bracket 21 through the rear panel 22. The driving mechanism 3 and the pushing mechanism 4 are respectively located on the two sides of the rear panel 22. The rear panel 22 is provided with a through hole, and the size of the through hole is greater than the diameter of the power output end 32 of the driving mechanism 3, so that the power output end 32 can pass through the through hole to provide driving force for the pushing mechanism 4. The shape and size of the support frame 2 can be designed according to the actual installation space and use requirements, and a high-strength metal material is used to manufacture the support frame 2, so that the strength and stability of the support frame 2 can withstand the force during the pushing process.

[0026] The driving mechanism 3 comprises an installation end 31 and a power output end 32. The installation end 31 is fixed on the support frame 2, and the power output end 32 can perform telescopic movement relative to the installation end 31.

[0027] The driving mechanism 3 can adopt mechanisms with telescopic power output ends 32, such as air cylinders, hydraulic cylinders or electric push rods. In this embodiment, the driving mechanism 3 is selected as an air cylinder, wherein the cylinder body is the installation end 31, and the piston rod is the power output end 32. The rear end of the cylinder body is installed on the driving installation bracket 23 through the trunnion seat 25 and the stop block 24.

[0028] The pushing mechanism 4 comprises a first connecting rod 41, a second connecting rod 42 and a force transmission member 45.

[0029] One end of the first connecting rod 41, one end of the second connecting rod 42 and one end of the force transmission member 45 are connected through a first pin shaft 44. The first connecting rod 41, the second connecting rod 42 and the force transmission member 45 can all rotate horizontally around the first pin shaft 44.

[0030] The other end of the first connecting rod 41 is connected with the rear panel 22 of the pushing bracket 21 through a second pin shaft, and the first connecting rod 41 can rotate horizontally around the connection point with the rear panel 22.

[0031] The other end of the second connecting rod 42 is provided with a connecting block 43, which is connected with the second connecting rod 42 through a third pin shaft and is fixedly connected with the power output end 32. The second connecting rod 42 can rotate horizontally around the connecting point of the second connecting rod 42 and the connecting block 43.

[0032] The other end of the force transmission member 45 is connected with the electric car hook 1 through a fourth pin shaft, and the force transmission member 45 can rotate horizontally around the connecting point of the force transmission member 45 and the electric car hook 1. It should be noted that the second pin shaft, the third pin shaft and the fourth pin shaft are all hidden inside the connecting points, and therefore are not shown in the figure.

[0033] During the extension and retraction of the power output end 32, the second connecting rod 42 is driven to rotate around the connecting point of the first connecting rod 41 and the force transmission member 45. At the same time, the rotation of the second connecting rod 42 drives the first connecting rod 41 to rotate horizontally around the connecting point of the first connecting rod 41 and the support frame 2, and drives the force transmission member 45 to rotate horizontally around the connecting point of the force transmission member 45 and the electric car hook 1. It can be understood that during the horizontal outward rotation of the force transmission member and the second connecting rod, the pushing mechanism as a whole presents an outward expansion trend.

[0034] When the power output end 32 extends to the maximum position of the stroke, the connecting point of the first connecting rod 41 and the support frame 2, the connecting point of the first connecting rod 41, the second connecting rod 42 and the force transmission member 45, and the connecting point of the force transmission member 45 and the electric car hook 1 are in a "dead point" or near "dead point" state, and the first connecting rod 41, the second connecting rod 42 and the force transmission member 45 form a self-locking structure, which ensures that the electric car hook 1 will not be accidentally retracted due to external force after being coupled.

[0035] In the above-mentioned illustrative embodiment, during the extension and retraction of the electric car hook 1 by the pushing mechanism 4, the electric car hook 1 is subjected to a force in the front-back direction of the horizontal plane, without a vertical component force generated by the oblique pushing mechanism, so as to ensure that the electric car hook 1 will not be stuck, and after the pushing mechanism 4 extends the electric car hook 1, the connecting rod mechanism can be self-locked, so as to ensure that the electric car hook 1 will not be retracted when subjected to a large force.

[0036] In order to realize mechanical self-locking, in some embodiments of the present application, as shown in Figure 7As shown, when the power output end 32 extends to the maximum stroke position, the electric car coupler 1 is driven by the pushing mechanism 4 to extend to the position and be connected with the electric car coupler 1 on the opposite side. The electric car coupler 1 is subjected to the force from the electric car coupler 1 on the opposite side, and the force is transmitted to the force transmission member 45, so that the first connecting rod 41 and the second connecting rod 42 have a tendency to move away from the longitudinal center line 7 of the electric car coupler 1. Since the second connecting rod 42 is connected with the power output end 32 at this time, and the power output end 32 has extended to the maximum stroke position and is limited by the cylinder cover and the piston and other cylinder internal mechanisms, the force transmission member 45, the first connecting rod 41 and the second connecting rod 42 cannot continue to rotate outward, and are kept in place under the limitation of the power output end 32 to form a self-locking structure.

[0037] In order to further realize mechanical self-locking, in some embodiments of the present application, when the power output end 32 extends to the maximum stroke position, the first connecting rod 41 and the force transmission member 45 form a predetermined angle towards one side of the longitudinal center line 7 of the electric car coupler 1, and the predetermined angle is less than 180°, so that the pushing mechanism can form a self-locking structure.

[0038] In some embodiments of the present application, during the extension of the power output end 32, the second connecting rod 42 is driven to rotate around the connecting point of the first connecting rod 41, the second connecting rod 42 and the force transmission member 45, and at the same time, the first connecting rod 41 is driven to rotate away from the longitudinal center line 7 of the electric car coupler 1 around the connecting point of the first connecting rod 41 and the support frame 2, and the force transmission member 45 is driven to rotate away from the longitudinal center line 7 of the electric car coupler 1 around the connecting point of the force transmission member 45 and the electric car coupler 1.

[0039] In some embodiments of the present application, during the extension of the power output end 32, the second connecting rod 42 is driven to rotate around the connecting point of the first connecting rod 41, the second connecting rod 42 and the force transmission member 45, and at the same time, the first connecting rod 41 is driven to rotate towards the longitudinal center line 7 of the electric car coupler 1 around the connecting point of the first connecting rod 41 and the support frame 2, and the force transmission member 45 is driven to rotate towards the longitudinal center line 7 of the electric car coupler 1 around the connecting point of the force transmission member 45 and the electric car coupler 1.

[0040] In some embodiments of the present application, a guide portion 11 is arranged on the electric car coupler 1.

[0041] The pushing mechanism 4 further comprises a guide rod 5 arranged in parallel to the longitudinal center line 7 of the electric car coupler 1, and the guide rod 5 is fixed to the support frame 2 and penetrates through the guide portion 11 at the other end, so that the electric car coupler 1 moves along the guide rod 5 during the extension and retraction of the electric car coupler 1.

[0042] In some embodiments of the present application, the pushing mechanism 4 further comprises an elastic member 46.

[0043] As an embodiment of the present application, as shown in Figures 6-7As shown, the force transmission member 45 is an elastic rod, and the elastic member 46 is a spring, which is sleeved outside the force transmission member 45. When the electric car coupler 1 is subjected to the force from the opposite electric car coupler 1, the force is transmitted to the force transmission member 45, and the elastic member 46 is compressed, and the elastic member 46 plays a buffering role. After the elastic member 46 is compressed, the force will be transmitted along the force transmission member 45 to the rear, so that the first connecting rod 41 and the second connecting rod 42 have a tendency to move outward.

[0044] As another embodiment of the present application, as shown in Figure 11 As shown, the force transmission member 45 is an elastic rod, and the elastic member 46 is a spring, which is sleeved outside the first connecting rod 41. When the electric car coupler 1 is subjected to the force from the opposite electric car coupler 1, the force is transmitted to the force transmission member 45, and then transmitted to the first connecting rod 41 by the force transmission member 45, so that the first connecting rod 41 has a tendency to move outward, and the elastic member 46 is compressed, and the elastic member 46 plays a buffering role.

[0045] As another embodiment of the present application, as shown in Figure 12 As shown, the force transmission member 45 is a rigid connecting rod, and the elastic member 46 is a spring. The spring is installed at the rear end of the driving mounting bracket 23 by penetrating the rear panel 22 and the driving mounting bracket 23 through a bolt, so that the driving mounting bracket 23 and the pushing bracket 21 can move relatively. When the electric car coupler 1 is connected, the connecting force is transmitted to the driving mechanism 3, and then transmitted to the driving mounting bracket 23, so that the spring is compressed, and the driving mechanism 3 and the driving mounting bracket 23 can move backward as a whole, so as to realize the buffering function of the spring.

[0046] In some embodiments of the present application, the pushing mechanism 4 and the guide rod 5 include two groups, and the two groups of pushing mechanisms 4 and the two groups of guide rods 5 are symmetrically arranged relative to the longitudinal center line 7 of the coupler, so that the forces on both sides of the electric car coupler 1 are balanced.

[0047] In some embodiments of the present application, an auxiliary driving mechanism 6 is further included, which is connected with the power output end 32 in a shaft manner. When the auxiliary driving mechanism 6 rotates, the power output end 32 is driven to extend or retract.

[0048] Specifically, the auxiliary driving mechanism 6 includes a third connecting rod 61 and a rotating arm 62. The third connecting rod 61 and the rotating arm 62 are connected in a shaft manner. The third connecting rod 61 is connected with the power output end 32 in a shaft manner at an end away from the rotating arm 62. The rotating arm 62 is connected with the support frame 2 in a shaft manner at an end away from the third connecting rod 61.

[0049] When the driving mechanism 3 is invalid, the rotating arm 62 of the auxiliary driving mechanism 6 is manually operated to rotate, so as to drive the power output end 32 of the driving mechanism 3 to extend or retract, thereby realizing emergency operation.

[0050] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to preferred embodiments, persons skilled in the art should understand that the specific implementation methods of the present invention may still be modified or some technical features may be replaced by equivalents without departing from the spirit of the technical solutions of the present invention, and all of these should fall within the scope of the technical solutions claimed for protection by the present invention.

Claims

1. An electric coupler pushing device, characterized in that: include: Support frame; A driving mechanism, including a mounting end and a power output end; The mounting end is fixed on the support frame; The power output end is retractably arranged relative to the mounting end; A pushing mechanism, comprising a first connecting rod, a second connecting rod and a force transmission member; One end of the first connecting rod, one end of the second connecting rod and one end of the force transmission member are axially connected by a same pin; The other end of the first connecting rod is axially connected to the support frame; The other end of the second connecting rod is axially connected to the power output end; the other end of the force transmission member is axially connected to the electric coupler; During the extension and retraction process of the power output end, the first connecting rod, the second connecting rod and the force transmission member rotate relative to each other, and a self-locking structure is formed when the power output end is extended to the maximum stroke position.

2. The electric coupler pushing device according to claim 1, characterized in that: When the power output end is extended to the maximum stroke position, the electric coupler is driven to extend into position by the pushing mechanism and connected to the electric coupler on the opposite side. The force applied from the electric coupler on the opposite side is transmitted to the force transmission member, causing the first connecting rod and the second connecting rod to have a tendency to move away from the longitudinal center line of the coupler, and remain in place under the restriction of the power output end to form a self-locking structure.

3. The electric coupler pushing device according to claim 1 or 2, characterized in that: When the power output end is extended to the maximum stroke position, the first connecting rod and the force transmission member form a predetermined angle toward one side of the longitudinal center line of the coupler, and the predetermined angle is less than 180°.

4. The electric coupler pushing device according to claim 1, characterized in that: During the extension of the power output end, the second connecting rod is driven to rotate around the connection point between the first connecting rod, the second connecting rod and the force transmission component. At the same time, the first connecting rod is driven to rotate around the connection point between it and the support frame, and the force transmission component is driven to rotate around the connection point between it and the electric coupler, in a direction away from the longitudinal center line of the coupler.

5. The electric coupler pushing device according to claim 1 or 4, characterized in that: During the extension of the power output end, the second connecting rod is driven to rotate around the connection point between the first connecting rod, the second connecting rod and the force transmission component. At the same time, the first connecting rod is driven to rotate around the connection point between it and the support frame, and the force transmission component is driven to rotate around the connection point between it and the electric coupler, toward the longitudinal center line of the coupler.

6. The electric coupler pushing device according to claim 1, characterized in that: The electric coupler is provided with a guide portion; The pushing mechanism further includes a guide rod, which is arranged parallel to the longitudinal center line of the coupler, one end of which is fixed to the support frame, and the other end passes through the guide part, so that the electric coupler moves along the guide rod during extension and retraction.

7. The electric coupler pushing device according to claim 1, characterized in that: The pushing mechanism further includes an elastic member, and the elastic member is sleeved on the outside of the force transmission member or the first connecting rod.

8. The electric coupler pushing device according to claim 1, characterized in that: The support frame includes a pushing bracket and a driving mounting bracket; The pushing mechanism is installed on the pushing bracket, and the driving mechanism is installed on the driving mounting bracket; the pushing bracket and the driving mounting bracket are movably connected via an elastic member.

9. The electric coupler pushing device according to claim 1, characterized in that: It further includes an auxiliary driving mechanism, which is axially connected to the power output end, and drives the power output end to extend and retract when the auxiliary driving mechanism rotates.

10. The electric coupler pushing device according to claim 9, characterized in that: The auxiliary drive mechanism includes a third connecting rod and a rotating arm; the third connecting rod and the rotating arm are axially connected; one end of the third connecting rod away from the rotating arm is axially connected to the power output end; one end of the rotating arm away from the third connecting rod is axially connected to the support frame.

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