Three-phase linkage transmission mechanism and grounding switch

Abstract

The present application relates to three-phase linkage transmission mechanism and grounding switch. In the three-phase linkage transmission mechanism of the present application, a boss is arranged on the first transmission connecting rod hinged with the B-phase crank arm, the connecting rod hinge hole penetrates the boss, the length of the connecting rod hinge hole is increased, and then the contact area of the first transmission connecting rod and the connecting pin is increased. The second transmission connecting rod is hinged with the first transmission connecting rod through the boss, and the outer diameter of the boss is larger than the outer diameter of the connecting pin. Compared with the second transmission connecting rod being directly hinged on the connecting pin, the second transmission connecting rod is hinged on the boss, and the contact area of the second transmission connecting rod and the boss is larger. By increasing the matching surface area of the first transmission connecting rod and the second transmission connecting rod, the wear speed of the first transmission connecting rod, the second transmission connecting rod and the hinge position of the B-phase crank arm is slowed down, the stability of the three-phase linkage transmission mechanism is improved, and the technical problem that the gap between the B-phase crank arm and the transmission connecting rod connection position in the current grounding switch is easily increased, causing the grounding switch to be easily invalid is solved.

Description

Technical Field

[0001] This invention relates to a three-phase linkage transmission mechanism and a grounding switch. Background Technology

[0002] As a special type of grounding switch capable of switching current, fast grounding switches in power systems have the function of switching electromagnetic electrostatic induced current and forcibly closing fault current. Therefore, fast grounding switches require high opening and closing speeds. In fast mechanical switches with three-phase mechanical linkage, the transmission system needs to withstand greater operating power, placing even higher demands on the entire transmission structure.

[0003] In current three-phase mechanically linked fast grounding switches, the three-phase switches achieve synchronous operation through crank arms and transmission links. The crank arms of phase A and phase B, as well as phase B and phase C, are all connected by transmission links. The crank arm of phase B connects two transmission links through a connecting pin, resulting in a relatively complex force situation. The fast opening and closing speed of the three-phase mechanically linked fast grounding switch generates strong impact forces. The transmission gap at the connection position between the crank arm of phase B and the transmission link is prone to increase, which can lead to the grounding switch failure and reduce the stability of the power system. Summary of the Invention

[0004] The purpose of this invention is to provide a three-phase linkage transmission mechanism to solve the technical problem that the gap between the B-phase crank arm and the transmission link in the current grounding switch is easy to increase, which leads to the failure of the grounding switch. In addition, the purpose of this invention is also to provide a grounding switch using the above-mentioned three-phase linkage transmission mechanism.

[0005] The three-phase linkage transmission mechanism of the present invention adopts the following technical solution:

[0006] The three-phase linkage transmission mechanism includes:

[0007] The A-phase crank arm is used to drive the A-phase switch.

[0008] The B-phase crank arm is used to drive the B-phase switch.

[0009] The C-phase crank arm is used to drive the C-phase switch.

[0010] The first transmission link is hinged at both ends to the A-phase crank arm and the B-phase crank arm, respectively.

[0011] The second transmission link is hinged at both ends to the B-phase crank arm and the C-phase crank arm, respectively.

[0012] A connecting pin is installed on the B-phase crank arm;

[0013] The first transmission link is provided with a link hinge hole for the connecting pin to pass through. The first transmission link is provided with a boss that protrudes along the axial direction of the connecting pin. The link hinge hole passes through the boss. The first transmission link is hinged to the B-phase crank arm through the connecting pin.

[0014] The second transmission link is provided with a boss hinge hole. The boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link. The boss hinge hole and the link hinge hole are coaxial.

[0015] Beneficial effects: In the three-phase linkage transmission mechanism of the present invention, a boss is provided on the first transmission link hinged to the B-phase crank arm. The link hinge hole passes through the boss, increasing the length of the link hinge hole and thus increasing the contact area between the first transmission link and the connecting pin. The second transmission link is hinged to the first transmission link through the boss, and the outer diameter of the boss is larger than the outer diameter of the connecting pin. Compared with the second transmission link being directly hinged to the connecting pin, the second transmission link is hinged to the boss, and the contact area between the second transmission link and the boss is larger. By increasing the mating surface area on the first and second transmission links, the wear rate at the hinge point between the first and second transmission links and the B-phase crank arm is reduced, improving the stability of the three-phase linkage transmission mechanism. This solves the technical problem that the gap between the B-phase crank arm and the transmission link in the current grounding switch is prone to increase, leading to the failure of the grounding switch.

[0016] Furthermore, the connecting pin is provided with a positioning shoulder that engages with the first transmission link. The positioning shoulder positions the first transmission link, further improving the stability of the transmission mechanism.

[0017] Furthermore, the end of the first transmission link that is hinged to the B-phase crank arm is provided with a thinned portion, and the boss is provided on the thinned portion. This makes the transmission mechanism more compact.

[0018] Furthermore, the end of the second transmission link that is hinged to the first transmission link is provided with a thinned portion, and the boss hinge hole is provided on the thinned portion. This makes the transmission mechanism more compact.

[0019] Furthermore, the connecting pin is fixed to the B-phase crank arm. This fixed connection method provides a more stable structure.

[0020] The technical solution of the grounding switch of this invention:

[0021] The grounding switch includes an A-phase switch, a B-phase switch, a C-phase switch, a three-phase linkage transmission mechanism, and a drive mechanism; the three-phase linkage transmission mechanism is driven by the drive mechanism, which drives the A-phase switch, B-phase switch, and C-phase switch to operate.

[0022] The three-phase linkage transmission mechanism includes:

[0023] The A-phase crank arm is used to drive the A-phase switch.

[0024] The B-phase crank arm is used to drive the B-phase switch.

[0025] The C-phase crank arm is used to drive the C-phase switch.

[0026] The first transmission link is hinged at both ends to the A-phase crank arm and the B-phase crank arm, respectively.

[0027] The second transmission link is hinged at both ends to the B-phase crank arm and the C-phase crank arm, respectively.

[0028] A connecting pin is installed on the B-phase crank arm;

[0029] The first transmission link is provided with a link hinge hole for the connecting pin to pass through. The first transmission link is provided with a boss that protrudes along the axial direction of the connecting pin. The link hinge hole passes through the boss. The first transmission link is hinged to the B-phase crank arm through the connecting pin.

[0030] The second transmission link is provided with a boss hinge hole. The boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link. The boss hinge hole and the link hinge hole are coaxial.

[0031] Beneficial effects: In the three-phase linkage transmission mechanism, a boss is provided on the first transmission link hinged to the B-phase crank arm. The link hinge hole passes through the boss, increasing the length of the link hinge hole and thus increasing the contact area between the first transmission link and the connecting pin. The second transmission link is hinged to the first transmission link through the boss, and the outer diameter of the boss is larger than the outer diameter of the connecting pin. Compared with the second transmission link being directly hinged to the connecting pin, the second transmission link is hinged to the boss, resulting in a larger contact area with the boss. By increasing the mating surface area on the first and second transmission links, the wear rate at the hinge points of the first and second transmission links and the B-phase crank arm is reduced, improving the stability of the three-phase linkage transmission mechanism. This solves the technical problem that the gap between the B-phase crank arm and the transmission link in the current grounding switch is prone to increase, leading to the failure of the grounding switch.

[0032] Furthermore, the connecting pin is provided with a positioning shoulder that engages with the first transmission link. The positioning shoulder positions the first transmission link, further improving the stability of the transmission mechanism.

[0033] Furthermore, the end of the first transmission link that is hinged to the B-phase crank arm is provided with a thinned portion, and the boss is provided on the thinned portion. This makes the transmission mechanism more compact.

[0034] Furthermore, the end of the second transmission link that is hinged to the first transmission link is provided with a thinned portion, and the boss hinge hole is provided on the thinned portion. This makes the transmission mechanism more compact.

[0035] Furthermore, the connecting pin is fixed to the B-phase crank arm. This fixed connection method provides a more stable structure. Attached Figure Description

[0036] Figure 1 This is a partial structural schematic diagram of a specific embodiment 1 of the grounding switch of the present invention;

[0037] Figure 2 This is another partial view of a specific embodiment 1 of the grounding switch of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of the first transmission link of the three-phase linkage transmission mechanism in a specific embodiment 1 of the grounding switch of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the second transmission link of the three-phase linkage transmission mechanism in a specific embodiment 1 of the grounding switch of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of the B-phase crank arm of the three-phase linkage transmission mechanism in a specific embodiment 1 of the grounding switch of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the first transmission link, the second transmission link, and the B-phase crank arm in a specific embodiment 1 of the grounding switch of the present invention;

[0042] In the diagram: 1. Phase A switch; 2. Phase B switch; 3. Phase C switch; 4. Drive mechanism; 5. Phase A crank arm; 6. Phase B crank arm; 7. Phase C crank arm; 8. Switch transmission rod; 9. Moving contact; 10. Contact seat; 11. First transmission link; 111. Link hinge hole; 112. Boss; 113. Thinned part of the first transmission link; 12. Second transmission link; 121. Boss hinge hole; 122. Thinned part of the second transmission link; 13. Connecting pin; 131. Positioning shoulder; 14. Cotter pin; 15. Copper sleeve; 16. Fixed shaft; 17. Baffle. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0045] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] The terms “up,” “down,” “front,” “back,” “left,” “right,” etc., indicate assumed orientations or positional relationships and are used only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0047] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0048] Specific embodiment 1 of the grounding switch of the present invention:

[0049] like Figure 1 and Figure 2 As shown, the grounding switch includes phase A switch 1, phase B switch 2, phase C switch 3, a three-phase linkage transmission mechanism, and a drive mechanism 4. The three-phase linkage transmission mechanism is mounted on the grounding switch frame and is driven by the drive mechanism 4 to synchronously operate phase A switch 1, phase B switch 2, and phase C switch 3.

[0050] The three-phase linkage transmission mechanism includes an A-phase crank arm 5, a B-phase crank arm 6, and a C-phase crank arm 7. All three crank arms are rotatably mounted on the frame. Each crank arm includes two supporting arms, one of which is connected to the corresponding switch transmission rod 8, driving the moving contact 9 of the corresponding switch to move relative to the contact seat 10, thus realizing the opening and closing operation of the switch. The A-phase crank arm 5 drives the A-phase switch 1, the B-phase crank arm 6 drives the B-phase switch 2, and the C-phase crank arm 7 drives the C-phase switch 3. In this embodiment, the drive shaft of the drive mechanism 4 engages with the A-phase crank arm 5 to prevent rotation, driving the A-phase crank arm 5 to rotate. In other embodiments, the drive shaft may engage with either the C-phase crank arm or the B-phase crank arm to prevent rotation.

[0051] The three-phase linkage transmission mechanism includes a first transmission link 11 and a second transmission link 12. The two ends of the first transmission link 11 are respectively hinged to the support arm of the A-phase crank arm 5 and the support arm of the B-phase crank arm 6 to form a parallelogram linkage mechanism. The two ends of the second transmission link 12 are respectively hinged to the support arm of the B-phase crank arm 6 and the support arm of the C-phase crank arm 7 to form a parallelogram linkage mechanism.

[0052] Because one arm of the B-phase crank arm 6 needs to be hinged to the first transmission link 11 and the second transmission link 12, the connection structure at this point is relatively complex, and the mating surfaces between the parts are small, making them prone to wear. To improve the stability of the transmission mechanism, this embodiment features an innovative design for this connection structure, increasing the mating surface area of ​​the parts. For example... Figures 3 to 6 As shown, a connecting pin 13 is fixed on the support arm of the B-phase crank arm 6. The first transmission connecting rod 11 is provided with a connecting rod hinge hole 111 and a boss 112 protruding along the axial direction of the connecting pin 13. The connecting rod hinge hole 111 passes through the boss 112. The connecting pin 13 passes through the connecting rod hinge hole 111 to realize the hinge connection between the first transmission connecting rod 11 and the support arm of the B-phase crank arm 6.

[0053] The second transmission link 12 is provided with a boss hinge hole 121. The boss 112 is inserted into the boss hinge hole 121 to realize the hinge between the first transmission link 11 and the second transmission link 12. The boss hinge hole 121 and the link hinge hole 111 are coaxial.

[0054] By providing the boss 112, the length of the connecting rod hinge hole 111 is extended, increasing the mating area between the first transmission connecting rod 11 and the connecting pin 13. Compared to the second transmission connecting rod 12 being hinged to the connecting pin 13, the second transmission connecting rod 12 being hinged to the boss 112 results in a larger inner wall area of ​​the hinge hole on the second transmission connecting rod 12, and it does not need to directly contact the connecting pin 13, thus avoiding changes to the structure of the connecting pin 13. By increasing the mating area between the first transmission connecting rod 11 and the connecting pin 13, and simultaneously increasing the mating area between the second transmission connecting rod 12 and the first transmission connecting rod 11, the wear rate is reduced, and the stability of the transmission mechanism is improved.

[0055] To further improve the stability of the transmission mechanism, in this embodiment, the connecting pin 13 is provided with a positioning shoulder 131 that is positioned and engaged with the first transmission link 11. One end of the connecting pin 13 is provided with a cotter pin hole. The connecting pin 13 is provided with a stop plate 17 that is engaged with the second transmission link 12. The stop plate restricts the separation of the second transmission link 12 from the connecting pin 13. A cotter pin 14 is provided in the cotter pin hole to stop the stop plate. The cotter pin 14 restricts the separation of the stop plate from the connecting pin 13.

[0056] In this embodiment, both the first transmission link 11 and the second transmission link 12 are elongated plate structures. The end of the first transmission link 11 that is hinged to the B-phase crank arm 6 is provided with a thinned portion 113, and a boss 112 is provided on the thinned portion 113. The end of the second transmission link 12 that is hinged to the first transmission link 11 is provided with a thinned portion 122, and a boss hinge hole 121 is provided on the thinned portion 122. By providing the thinned portion, the structure can be made more compact.

[0057] In the grounding switch of the present invention, the driving mechanism drives the A-phase crank arm to move in a circular motion, and then the A-phase crank arm drives the B-phase crank arm and the C-phase crank arm to move in a circular motion through the first transmission link and the second transmission link.

[0058] The B-phase crank arm and the C-phase crank arm rotate around the fixed shaft 16. The inner hole of the B-phase crank arm and the C-phase crank arm is fitted with a copper sleeve 15 through an interference fit. The copper sleeve is pressed into the inner hole of the B-phase crank arm and the C-phase crank arm by a press. The wear resistance of the copper sleeve improves the problem of excessive clearance caused by friction.

[0059] In a specific embodiment 2 of the grounding switch of the present invention, one arm of the crank arm in the above embodiment is hinged to the transmission link, and the other arm is hinged to the transmission rod of the corresponding switch. In this embodiment, both arms of the crank arm are connected to the transmission link. At this time, two first transmission links and two second transmission links are provided. The two first transmission links are parallel, and the two second transmission links are parallel. The crank arm needs to be coaxially fixedly connected to a switch crank arm, and the corresponding switch is driven to move through the switch crank arm.

[0060] In a specific embodiment 3 of the grounding switch of the present invention, the first transmission link in the above embodiment is provided with a thinned portion. In this embodiment, the thickness of the first transmission link is the same at all points. In other embodiments, the second transmission link can also be a connecting plate of equal thickness without the thinned portion. In other embodiments, the first and second transmission links can also be round rods. In this case, flat heads need to be provided at both ends of the round rod to facilitate the provision of hinge holes.

[0061] In a specific embodiment 4 of the grounding switch of the present invention, the B-phase crank arm is fixed to the connecting pin in the above embodiments. In this embodiment, the B-phase crank arm and the connecting pin are anti-rotationally engaged. Of course, in other embodiments, the B-phase crank arm can also be hinged to the connecting pin.

[0062] In a specific embodiment 5 of the grounding switch of the present invention, in the above embodiment, the connecting pin is provided with a positioning shoulder that cooperates with the first transmission link. In this embodiment, a positioning sleeve is sleeved on the connecting pin, and the positioning sleeve is located between the crank arm and the first transmission link.

[0063] The specific embodiment of the three-phase linkage transmission mechanism of the present invention is the same as the structure of the three-phase linkage transmission mechanism described in any of the above-mentioned specific embodiments of the grounding switch, and will not be repeated here.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A three-phase linkage transmission mechanism, including: A-phase crank arm (5) is used to drive the A-phase switch (1) to operate; B-phase crank arm (6) is used to drive the B-phase switch (2) to operate; C-phase crank arm (7) is used to drive the C-phase switch (3) to operate; a first transmission link (11) is hinged at both ends to the A-phase crank arm and the B-phase crank arm respectively; a second transmission link (12) is hinged at both ends to the B-phase crank arm and the C-phase crank arm respectively; characterized in that a connecting pin (13) is provided on the B-phase crank arm; a connecting rod hinge hole (111) is provided on the first transmission link for the connecting pin to pass through, and a boss (112) protruding along the axial direction of the connecting pin is provided on the first transmission link, the connecting rod hinge hole is provided through the boss, and the first transmission link is hinged to the B-phase crank arm through the connecting pin; a boss hinge hole (121) is provided on the second transmission link, the boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link, and the boss hinge hole is coaxial with the connecting rod hinge hole; a positioning shoulder (131) is provided on the connecting pin to position and cooperate with the first transmission link.

2. The three-phase linkage transmission mechanism according to claim 1, characterized in that, The end of the first transmission link (11) that is hinged to the B-phase crank arm (6) is provided with a first transmission link thinning part (113), and the boss (112) is provided on the first transmission link thinning part (113).

3. The three-phase linkage transmission mechanism according to claim 1, characterized in that, The end of the second transmission link (12) that is hinged to the first transmission link (11) is provided with a second transmission link thinning part (122), and the boss hinge hole (121) is provided on the second transmission link thinning part (122).

4. The three-phase linkage transmission mechanism according to claim 1, characterized in that, The connecting pin (13) is fixed to the B-phase crank arm (6).

5. A three-phase linkage transmission mechanism, including: A-phase crank arm (5) is used to drive the A-phase switch (1) to operate; B-phase crank arm (6) is used to drive the B-phase switch (2) to operate; C-phase crank arm (7) is used to drive the C-phase switch (3) to operate; a first transmission link (11) is hinged at both ends to the A-phase crank arm and the B-phase crank arm respectively; a second transmission link (12) is hinged at both ends to the B-phase crank arm and the C-phase crank arm respectively; characterized in that a connecting pin (13) is provided on the B-phase crank arm; a connecting rod hinge hole (111) for the connecting pin to pass through is provided on the first transmission link, and a boss (111) protruding along the axial direction of the connecting pin is provided on the first transmission link. 12) The connecting rod hinge hole is provided through the boss. The first transmission connecting rod is hinged to the B-phase crank arm through the connecting pin. The second transmission connecting rod is provided with a boss hinge hole (121). The boss is inserted into the boss hinge hole to realize the hinge between the first transmission connecting rod and the second transmission connecting rod. The boss hinge hole and the connecting rod hinge hole are coaxial. The end of the first transmission connecting rod (11) that is hinged to the B-phase crank arm (6) is provided with a first transmission connecting rod thinning part (113). The boss (112) is provided on the first transmission connecting rod thinning part (113).

6. A three-phase linkage transmission mechanism, including: Phase A crank arm (5) is used to drive the phase A switch (1) to operate; Phase B crank arm (6) is used to drive the phase B switch (2) to operate; Phase C crank arm (7) is used to drive the phase C switch (3) to operate; a first transmission link (11) is hinged at both ends to the phase A crank arm and the phase B crank arm respectively; a second transmission link (12) is hinged at both ends to the phase B crank arm and the phase C crank arm respectively; characterized in that a connecting pin (13) is provided on the phase B crank arm; a connecting rod hinge hole (111) for the connecting pin to pass through is provided on the first transmission link, and a connecting pin is provided on the first transmission link along the axial direction of the connecting pin. A protruding boss (112) is provided, through which the connecting rod hinge hole is provided. The first transmission connecting rod is hinged to the B-phase crank arm by a connecting pin. The second transmission connecting rod is provided with a boss hinge hole (121). The boss is inserted into the boss hinge hole to realize the hinge between the first transmission connecting rod and the second transmission connecting rod. The boss hinge hole and the connecting rod hinge hole are coaxial. The end of the second transmission connecting rod (12) that is hinged to the first transmission connecting rod (11) is provided with a second transmission connecting rod thinning part (122). The boss hinge hole (121) is provided on the second transmission connecting rod thinning part (122).

7. A grounding switch, comprising an A-phase switch (1), a B-phase switch (2), a C-phase switch (3), a three-phase linkage transmission mechanism, and a drive mechanism (4); the three-phase linkage transmission mechanism is driven by the drive mechanism to move the A-phase switch, the B-phase switch, and the C-phase switch; the three-phase linkage transmission mechanism includes: Phase A crank arm (5) is used to drive the Phase A switch to operate; Phase B crank arm (6) is used to drive the Phase B switch to operate. C-phase crank arm (7) is used to drive the C-phase switch to operate; the first transmission link (11) is hinged at both ends to the A-phase crank arm and the B-phase crank arm respectively; the second transmission link (12) is hinged at both ends to the B-phase crank arm and the C-phase crank arm respectively; characterized in that the B-phase crank arm is provided with a connecting pin (13); the first transmission link is provided with a connecting rod hinge hole (111) for the connecting pin to pass through, and the first transmission link is provided with a boss (112) protruding along the axial direction of the connecting pin, the connecting rod hinge hole is provided through the boss, and the first transmission link is hinged to the B-phase crank arm through the connecting pin; the second transmission link is provided with a boss hinge hole (121), the boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link, the boss hinge hole is coaxial with the connecting rod hinge hole; the connecting pin is provided with a positioning shoulder (131) that is positioned and cooperates with the first transmission link.

8. The grounding switch according to claim 7, characterized in that, The end of the first transmission link (11) that is hinged to the B-phase crank arm (6) is provided with a first transmission link thinning part (113), and the boss (112) is provided on the first transmission link thinning part (113).

9. The grounding switch according to claim 7, characterized in that, The end of the second transmission link (12) that is hinged to the first transmission link (11) is provided with a second transmission link thinning part (122), and the boss hinge hole (121) is provided on the second transmission link thinning part (122).

10. The grounding switch according to claim 7, characterized in that, The connecting pin (13) is fixed to the B-phase crank arm (6).

11. A grounding switch, comprising an A-phase switch (1), a B-phase switch (2), a C-phase switch (3), a three-phase linkage transmission mechanism, and a drive mechanism (4); the three-phase linkage transmission mechanism is driven by the drive mechanism to drive the A-phase switch, the B-phase switch, and the C-phase switch to operate; the three-phase linkage transmission mechanism includes: Phase A crank arm (5) is used to drive the Phase A switch to operate; Phase B crank arm (6) is used to drive the Phase B switch to operate. C-phase crank arm (7) is used to drive the C-phase switch; the first transmission link (11) is hinged at both ends to the A-phase crank arm and the B-phase crank arm respectively; the second transmission link (12) is hinged at both ends to the B-phase crank arm and the C-phase crank arm respectively; characterized in that the B-phase crank arm is provided with a connecting pin (13); the first transmission link is provided with a link hinge hole (111) for the connecting pin to pass through, and the first transmission link is provided with a boss (112) protruding along the axial direction of the connecting pin, the link hinge hole being through. The first transmission link is hinged to the B-phase crank arm via a connecting pin; the second transmission link is provided with a boss hinge hole (121), and the boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link. The boss hinge hole and the link hinge hole are coaxial; the end of the first transmission link (11) that is hinged to the B-phase crank arm (6) is provided with a first transmission link thinning part (113), and the boss (112) is provided on the first transmission link thinning part (113).

12. A grounding switch, comprising an A-phase switch (1), a B-phase switch (2), a C-phase switch (3), a three-phase linkage transmission mechanism, and a drive mechanism (4); the three-phase linkage transmission mechanism is driven by the drive mechanism to drive the A-phase switch, the B-phase switch, and the C-phase switch to operate; the three-phase linkage transmission mechanism includes: Phase A crank arm (5) is used to drive the Phase A switch to operate; Phase B crank arm (6) is used to drive the Phase B switch to operate. C-phase crank arm (7) is used to drive the C-phase switch; the first transmission link (11) is hinged at both ends to the A-phase crank arm and the B-phase crank arm respectively; the second transmission link (12) is hinged at both ends to the B-phase crank arm and the C-phase crank arm respectively; characterized in that the B-phase crank arm is provided with a connecting pin (13); the first transmission link is provided with a connecting rod hinge hole (111) for the connecting pin to pass through, and the first transmission link is provided with a boss (112) protruding along the axial direction of the connecting pin, the connecting rod hinge hole passing through the boss is provided with The first transmission link is hinged to the B-phase crank arm via a connecting pin; the second transmission link is provided with a boss hinge hole (121), the boss is inserted into the boss hinge hole to realize the hinge between the first transmission link and the second transmission link, the boss hinge hole and the link hinge hole are coaxial; the end of the second transmission link (12) that is hinged to the first transmission link (11) is provided with a second transmission link thinning part (122), and the boss hinge hole (121) is provided on the second transmission link thinning part (122).

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