Connection structure of moving contact, and assembly method

Abstract

A connection structure of a moving contact, and an assembly method. A contact support is connected to a cantilever on a main shaft by means of a connecting rod; the main shaft drives, by means of the contact support, moving contacts to come into contact with or be separated from static contacts; the connecting rod is rotatably connected to the cantilever by means of a connecting member; the connecting member comprises a first mounting portion and a limiting portion; the connecting rod and the cantilever are respectively provided with first connecting holes and a second connecting hole allowing the first mounting portion to pass through; the first mounting portion is provided with a first boss and a second boss each protruding in the radial direction; a first recess allowing the first boss to pass through is formed on the hole wall of each first connecting hole; a second recess allowing the first boss to pass through is formed on the hole wall of the second connecting hole; the first boss passes through the first connecting holes and the second connecting hole and is then misaligned with the first recesses, so that the connecting rod and the cantilever are limited between the first boss and the limiting portion in the axial direction of the first mounting portion; the second recess of the cantilever is sleeved on the second boss and is in limiting fit with the connecting member in the circumferential direction. The structure has the feature of being easy to assemble.

Description

Connection structure and assembly method of moving contact

[0001] This application claims priority to Chinese Patent Application No. 202510083955.6, filed on January 20, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of low-voltage electrical appliances, and more specifically to a connection structure and assembly method for a moving contact. Background Technology

[0003] Disconnecting switches are commonly used in low-voltage power distribution systems to connect and disconnect circuits. A disconnecting switch mainly consists of an insulating housing, an operating mechanism, and a contact system inside the insulating housing. Its working principle involves the operating mechanism driving the contact system to connect and disconnect, thereby completing the closing and opening actions. Therefore, the connection between the operating mechanism and the contact system is crucial. However, existing systems have a large number of connecting parts between the operating mechanism and the contact system, making assembly difficult and prone to misassembly and omissions. Otherwise, reliability is poor, and damage or detachment during operation can occur, preventing the operating mechanism from driving the contact system to connect and disconnect. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and provide a connection structure and assembly method for a moving contact.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A connection structure for a moving contact includes a rotatably mounted contact support, a moving contact mounted on the contact support, and a main shaft connected to an operating mechanism. The main shaft has a cantilever that rotates synchronously with it. The contact support is connected to the cantilever via a connecting rod. The operating mechanism can drive the main shaft to rotate, causing the main shaft to drive the contact support to rotate. The contact support then drives the moving contact to contact and separate from the stationary contact.

[0007] One end of the connecting rod is rotatably connected to the contact support, and the end of the connecting rod away from the contact support is rotatably connected to the cantilever via a connector. When the cantilever rotates with the main shaft, it drives the contact support to rotate through the connecting rod.

[0008] The connector includes a first mounting portion arranged parallel to the main shaft, and a limiting portion disposed on one axial side of the first mounting portion. The connecting rod and the cantilever are respectively provided with a first connecting hole and a second connecting hole for passing through the first mounting portion. The first mounting portion is provided with a first boss and a second boss that are respectively radially protruding. The wall of the first connecting hole is provided with a first groove that allows the first boss to pass through, and the wall of the second connecting hole is provided with a second groove that allows the first boss to pass through.

[0009] When the first mounting part aligns the first boss with the first groove and the second groove, it can drive the first boss to pass through the first connecting hole and the second connecting hole. After passing through the first connecting hole and the second connecting hole, the first boss is misaligned with the first groove, so that the connecting rod and the cantilever are axially limited between the first boss and the limiting part along the first mounting part.

[0010] The second groove of the cantilever is fitted onto the second protrusion and engages with the connector in a circumferential limiting manner, so that the connector rotates with the cantilever.

[0011] Preferably, the main shaft is rotatable between the main shaft closed position and the main shaft open position. When the main shaft is in the main shaft closed position, or in the main shaft open and closed position, or rotating between the main shaft closed position and the main shaft open position, the first boss and the first groove are always misaligned.

[0012] Preferably, when the main shaft drives the moving contact and the stationary contact to separate to the maximum distance, that is, when the main shaft rotates to the main shaft open position, the included angle α between the line connecting the top center of the first boss to the center of the first connecting hole and the line connecting the bottom center of the first groove to the center of the first connecting hole is greater than or equal to 15 degrees. When the main shaft rotates from the main shaft open position to the main shaft closed position, the first boss rotates in the direction of increasing included angle α. When the main shaft rotates to the main shaft closed position, the included angle α is less than 180 degrees.

[0013] Preferably, the connecting rod includes a first connecting part and a second connecting part for supporting connection with the contact. The second connecting part includes two connecting plates that are respectively connected to the first connecting part. The two connecting plates are arranged opposite each other at a distance. The cantilever can be inserted between the two connecting plates. The two connecting plates are respectively provided with the first connecting hole. The second boss can pass through the connecting plate from the first groove and be inserted into the second groove of the cantilever located between the two connecting plates.

[0014] Preferably, the distance between the first boss and the second boss, and the distance between the second boss and the limiting part, are both greater than the thickness of the second connecting part.

[0015] Preferably, the connecting rod is integrally formed, and the two connecting plates are connected to the first connecting part through a bending part.

[0016] Preferably, the two connecting plates are connected by a reinforcing part on their sides.

[0017] Preferably, the angle between the line connecting the bottom center of the first groove to the center of the first connecting hole and the line connecting the center of the first connecting hole and the center of the third connecting hole is 47-87 degrees.

[0018] Preferably, the first connecting part is provided with a third connecting hole, and the second connecting member passes through the third connecting hole to rotatably connect the first connecting part with the contact support.

[0019] Preferably, the contact support is provided with a first connecting groove, and a second connecting groove and a third connecting groove are provided on the two opposite sides of the first connecting groove. The second connecting member is disposed in the second connecting groove, and one end of the connecting rod with a third connecting hole is inserted into the first connecting groove. The second connecting member can pass through the third connecting hole and then be inserted into the third connecting groove, so that the connecting rod is connected to the contact support through the second connecting member.

[0020] Preferably, the second connector includes a second mounting part and a positioning part. The positioning part is connected to a return spring. One end of the connecting rod with a third connecting hole can be inserted into the second connecting groove and the third connecting hole is aligned with the second connector. The return spring can drive the second connector to move, so that the second mounting part passes through the third connecting hole on the connecting rod located in the second connecting groove, and the connecting rod is rotatably connected to the contact support via the second connector.

[0021] Preferably, the cantilever is provided with a fourth connecting hole and a fifth connecting hole. The cantilever is sleeved on the main shaft through the fourth connecting hole and the cantilever is fixedly connected to the main shaft. The fifth connecting hole is located on one side between the second connecting hole and the fifth connecting hole. The fifth connecting hole is connected to the operating mechanism through the drive shaft. The operating mechanism drives the main shaft to rotate through the drive shaft. The second groove is located on the hole wall of the second connecting hole near the fifth connecting hole.

[0022] Preferably, the angle between the line connecting the bottom center of the second groove to the center of the second connecting hole and the line connecting the center of the second connecting hole to the center of the fourth connecting hole is 16-56 degrees.

[0023] Preferably, the first mounting part of the connector is cylindrical and the limiting part is disc-shaped. One end of the first mounting part is connected to the middle of the limiting part. A first boss and a second boss that protrude radially are respectively provided on the side of the first mounting part. The first boss is located at the end of the side of the first mounting part away from the limiting part. The second boss is located between the first boss and the limiting part. The second boss is spaced apart from the first boss and the limiting part. The line connecting the first boss and the second boss is parallel to the axis of the connector.

[0024] An assembly method for a connecting structure of a moving contact includes the following steps:

[0025] Step S1: Align the second connecting hole on the cantilever with the first connecting hole on the connecting rod;

[0026] Step S2: Drive the cantilever to rotate by the main shaft, so that the second groove on the cantilever is aligned with the first groove on the connecting rod.

[0027] Step S3: Align the connector with the first connecting hole, and align the first boss on the connector with the first groove;

[0028] Step S4: Pass the connector through the first connecting hole through the connecting rod, pass the first boss through the first groove and the second groove, and insert the second boss into the second groove of the cantilever;

[0029] Step S5: Drive the cantilever to rotate by the main shaft, so that the first boss on the connector is misaligned with the first groove.

[0030] The moving contact connection structure of the present invention allows the contact support to be connected to a cantilever via a connecting rod. A connecting member passes through the connecting rod and the cantilever to connect the connecting rod and the cantilever. The connecting member has a first boss and a second boss. The first boss and a limiting part limit the connecting rod and the cantilever from both ends, connecting the connecting rod and the cantilever. The second boss cooperates with the second groove of the cantilever, keeping the first boss in the limiting position of the first groove. This allows the connecting member to rotate with the cantilever, but the connecting member cannot rotate on its own relative to the cantilever, preventing the connecting member from rotating arbitrarily and causing the first mounting part to fall off from the first and second connecting holes. There is no need to use cotter pins or other parts to connect the connecting member and the cantilever. Because welding is not required, it not only has the advantage of fewer parts, but also reduces the difficulty of assembly and prevents the problem of incorrect or missing parts during assembly.

[0031] Furthermore, when the main shaft is in the main shaft closed position, or in the main shaft open and closed position, or rotating between the main shaft closed position and the main shaft open position, the first boss and the first groove are always misaligned. Under the drive of the cantilever, the connector can only rotate within the angle range between the main shaft closed position and the main shaft open position, ensuring that the connector cannot rotate to the angle where the first boss and the first groove are aligned, so that the connector cannot fall off.

[0032] In addition, the one-piece molded connecting rod is stronger and less prone to bending and breakage, and the reinforcement can further improve the strength of the connecting rod.

[0033] The assembly method of the present invention does not require the use of cotter pins or other parts, nor does it require complex processes such as welding. It not only has the advantages of fewer parts and lower assembly difficulty, but also facilitates automated assembly design. Attached Figure Description

[0034] Figure 1 is a schematic diagram of the connection structure of the moving contact of the present invention;

[0035] Figure 2 is an exploded view of the connection structure of the moving contact of the present invention;

[0036] Figure 3 is a schematic diagram of the contact support structure of the present invention;

[0037] Figure 4 is a structural schematic diagram of the connector of the present invention;

[0038] Figure 5 is a cross-sectional view of the connection between the connecting rod, the connecting member, and the cantilever of the present invention;

[0039] Figure 6 is a schematic diagram of the structure when the first boss and the first groove of the present invention are aligned;

[0040] Figure 7 is a schematic diagram of the contact system of the present invention in the open position;

[0041] Figure 8 is a partial enlarged view of Figure 5 of the present invention;

[0042] Figure 9 is a schematic diagram of the contact system of the present invention in the closed position;

[0043] Figure 10 is a schematic diagram of the connecting rod of the present invention;

[0044] Figure 11 is a side view of the connecting rod of the present invention;

[0045] Figure 12 is a schematic diagram of the cantilever structure of the present invention;

[0046] Figure 13 is a side view of the cantilever of the present invention;

[0047] Figure 14 is a structural schematic diagram of the contact support and the second connector of the present invention;

[0048] In the diagram: 1 Moving contact 50 First connecting hole 2 Contact support 51 First connecting part 3 Main shaft 52 Second connecting part 4 Cantilever 53 Connecting plate 5 Connecting rod 54 Bending part 6 Connector 55 Reinforcing part 7 Second connecting part 56 Third connecting hole 21 Support seat 61 Mounting part 22 Side plate 62 Limiting part 23 First connecting groove 63 First boss 24 Second connecting groove 64 Second boss 25 Third connecting groove 71 Second mounting part 41 Second connecting hole 72 Positioning part 42 Second groove 73 Return spring 43 Fourth connecting hole 501 First groove 44 Fifth connecting hole Detailed Implementation

[0049] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the connection structure of the moving contact of the present invention. The connection structure of the moving contact of the present invention is not limited to the descriptions in the following embodiments.

[0050] The disconnecting switch in this embodiment includes a protection mechanism, a drive mechanism, an operating mechanism, and multiple contact systems, as well as multiple arc-extinguishing mechanisms respectively provided for the multiple contact systems.

[0051] Multiple contact systems include a stationary contact, a moving contact 1, and a rotatably mounted contact support 2. The moving contact 1 is mounted on the contact support 2. The stationary contact and the moving contact 1 are respectively connected to the circuit. A main shaft 3 is provided between the operating mechanism and the multiple contact systems. The main shaft 3 is rotatably mounted. The main shaft 3 has a cantilever 4 for driving the contact support 2 to rotate. The cantilever 4 is fixedly connected to the main shaft 3 and rotates synchronously with the main shaft 3. The drive mechanism can drive the main shaft 3 to rotate through the operating mechanism, so that the main shaft 3 drives the contact support 2 to rotate. Through the contact support 2, the moving contact 1 is driven to contact and separate from the stationary contact to conduct and disconnect the connected circuit. The protection mechanism is used to trigger the operating mechanism to trip and release the opening spring when a circuit fault occurs. The opening spring drives the contact support 2 to separate the moving contact 1 from the stationary contact to disconnect the circuit and achieve the protection function. The arc extinguishing mechanism is used to extinguish the arc generated by the contact system. The drive mechanism can be a manually operated handle or an electric motor. The contact support 2 includes a support base 21 and two side plates 22 disposed opposite to each other on the support base 21. A support shaft and a contact spring (not shown in the figure) are provided between the two side plates 22. The moving contact 1 is rotatably mounted on the support shaft. The contact spring is disposed between the moving contact 1 and the contact support 2, pre-tightening and fixing the moving contact 1 to the contact support 2. When the moving contact 1 contacts the stationary contact, the contact spring is used to drive the moving contact 1 to press against the stationary contact. Of course, the main shaft 3 can be used to drive the contact support 2 of one contact system to rotate or the contact support 2 of multiple contact systems to rotate.

[0052] As shown in Figures 1-5, an improvement in this embodiment lies in the connection structure of the moving contact of the contact system. The contact support 2 is connected to the cantilever 4 via a connecting rod 5. One end of the connecting rod 5 is rotatably connected to the contact support 2, and the end of the connecting rod 5 away from the contact support 2 is rotatably connected to the cantilever 4 via a connector 6. When the cantilever 4 rotates with the main shaft 3, it drives the contact support 2 to rotate via the connecting rod 5. The connector 6 includes a first mounting part 61 arranged parallel to the main shaft 3, and a limiting part 62 provided on one axial side of the first mounting part 61. The connecting rod 5 and the cantilever 4 are respectively provided with a first connecting hole 50 and a second connecting hole 41 for passing through the first mounting part 61. The first mounting part 61 is provided with a first boss 63 and a second boss 64 that are respectively radially protruding. The wall of the first connecting hole 50 is provided with a first groove 501 that can pass through the first boss 63, and the wall of the second connecting hole 41 of the cantilever 4 is provided with a second groove 42 that can pass through the first boss 63.

[0053] When the first mounting part 61 aligns the first boss 63 with the first groove 501 and the second groove 42, it can drive the first boss 63 to pass through the first connecting hole 50 and the second connecting hole 41. After the first mounting part 61 drives the first boss 63 to pass through the first connecting hole 50 and the second connecting hole 41, it can drive the first boss 63 to be misaligned with the first groove 501, so that the connecting rod 5 and the cantilever 4 are limited along the axial direction of the first mounting part 61 between the first boss 63 and the limiting part 62, thus connecting the connecting rod 5 and the cantilever 4.

[0054] The second groove 42 of the cantilever 4 is fitted onto the second boss 64 and is circumferentially positioned with the connector 6, allowing the connector 6 to rotate with the cantilever 4. The cantilever 4 drives the connector 6 to rotate, but the connector 6 cannot rotate independently relative to the cantilever 4, or can only rotate very slightly. For example, due to manufacturing errors, there may be a very small gap between the second boss 64 and the second groove 42. This prevents the connector 6 from rotating freely, which could cause the first mounting part 61 to detach from the first connecting hole 50 and the second connecting hole 41. Preferably, the second groove 42 and the second boss 64 are perfectly matched or have an interference fit.

[0055] In this embodiment, the moving contact connection structure has a contact support 2 connected to a cantilever 4 via a connecting rod 5. A connector 6 passes through the connecting rod 5 and the cantilever 4 to connect the connecting rod 5 and the cantilever 4. The connector 6 has a first boss 63 and a second boss 64. The first boss 63 and a limiting part 62 limit the connecting rod 5 and the cantilever 4 from both ends, connecting the connecting rod 5 and the cantilever 4. The second boss 64 cooperates with the second groove 42 of the cantilever 4, keeping the first boss 63 in the first groove 501 for limiting, so that the connector 6 rotates with the cantilever 4, but the connector 6 cannot rotate on its own relative to the cantilever 4. This prevents the connector 6 from rotating arbitrarily, which would cause the first mounting part 61 to fall out of the first connecting hole 50 and the second connecting hole 41. There is no need to use cotter pins or other parts to connect the connector 6 and the cantilever 4, because no welding is required. This not only has the advantage of fewer parts, but also reduces the difficulty of assembly and prevents the problem of incorrect or missing parts during assembly.

[0056] Driven by the operating mechanism, the main shaft 3 can rotate between the main shaft closed position and the main shaft open position. When the main shaft 3 rotates to the main shaft closed position, the contact support 2 drives the moving contact 1 to contact the stationary contact, thus closing the circuit breaker. When the main shaft 3 rotates to the main shaft open position, the main shaft 3 drives the moving contact 1 to separate from the stationary contact to the maximum distance, and then the contact support 2 drives the moving contact 1 to separate from the stationary contact, thus opening the circuit breaker. Preferably, when the main shaft 3 is in the main shaft closed position, or in the open position, or rotating between the main shaft closed and main shaft open positions, the first boss 63 and the first groove 501 are always misaligned. The connecting piece 6, driven by the cantilever 4, can only rotate within the angle range between the main shaft closed and main shaft open positions, ensuring that the connecting piece 6 cannot rotate to the angle where the first boss 63 and the first groove 501 are aligned, preventing the connecting piece 6 from falling off by itself after the first boss 63 and the first groove 501 are aligned.

[0057] As shown in Figure 6, when the main shaft 3 drives the first boss 63 to align with the first groove 501, the line connecting the top center of the first boss 63 to the center of the first connecting hole 50 coincides with the line connecting the bottom center of the first groove 501 to the center of the first connecting hole 50.

[0058] As shown in Figures 7-8, when the main shaft 3 drives the moving contact 1 to separate from the stationary contact to the maximum distance, that is, when the main shaft 3 rotates to the main shaft open position, the angle α between the line connecting the top center of the first boss 63 to the center of the first connecting hole 50 and the line connecting the bottom center of the first groove 501 to the center of the first connecting hole 50 is greater than or equal to 15 degrees.

[0059] As shown in Figure 9, when the main shaft 3 rotates from the main shaft open position to the main shaft closed position, the first protrusion 63 rotates in the direction of increasing angle α. When the main shaft 3 rotates to the main shaft closed position, that is, when the main shaft 3 drives the moving contact 1 to contact the stationary contact, the included angle α is less than 180 degrees. In this embodiment, the included angle α is approximately 103 degrees. When rotating from the main shaft closed position in Figure 9 back to the main shaft open position, when the moving contact 1 and the stationary contact are separated to the maximum distance, the main shaft 3 cannot continue to rotate. The first protrusion 63 cannot cross the position with an included angle of 15 degrees with the first groove 501, thus avoiding the connector 6 from falling off after the first protrusion 63 aligns with the first groove 501.

[0060] After the circuit breaker is assembled, it is in the open state. The first boss 63 and the first groove 501 are misaligned and locked by the cantilever 4. When the main shaft 3 drives the moving contact 1 and the stationary contact to separate to the maximum distance, it will not rotate to the angle where the first boss 63 and the first groove 501 are aligned.

[0061] The assembly steps in this embodiment are as follows:

[0062] Step S1: Align the second connecting hole 41 on the cantilever 4 with the first connecting hole 50 on the connecting rod 5;

[0063] Step S2: The main shaft 3 drives the cantilever 4 to rotate, so that the main shaft 3 drives the second groove 42 on the cantilever 4 to align with the first groove 501 on the connecting rod 5;

[0064] Step S3: Align the connector 6 with the first connecting hole 50, and align the first boss 63 on the connector 6 with the first groove 501;

[0065] Step S4: Pass the connector 6 through the first connecting hole 50 through the connecting rod 5, pass the first boss 63 through the first groove 501 and the second groove 42, and insert the second boss 64 into the second groove 42 of the cantilever 4;

[0066] Step S5: The main shaft 3 drives the cantilever 4 to rotate, causing the first boss 63 on the connector 6 to be misaligned with the first groove 501. Normally, the main shaft 3 drives the cantilever 4 to rotate to the main shaft open position, causing the first boss 63 on the connector 6 to be misaligned with the first groove 501.

[0067] Of course, the assembly steps also include the assembly steps of the connecting rod 5 and the contact support 2, which will not be described in detail here.

[0068] The assembly method in this embodiment does not require the use of cotter pins or other parts, nor does it require complex processes such as welding. It not only has the characteristics of fewer parts and lower assembly difficulty, but also facilitates automated assembly design.

[0069] As shown in Figures 10-11, the connecting rod 5 includes a first connecting part 51 and a second connecting part 52. The first connecting part 51 is provided with a third connecting hole 56. The second connecting member 7 passes through the third connecting hole 56 to rotatably connect the first connecting part 51 to the contact support 2. The second connecting part 52 includes two connecting plates 53 respectively connected to the first connecting part 51. The two connecting plates 53 are arranged opposite each other at a distance. The cantilever 4 can be inserted between the two connecting plates 53. The two connecting plates 53 are respectively provided with the first connecting hole 50. The width and height of the second boss 64 are smaller than the width and depth of the first groove 501, respectively. The second boss 64 can pass through the connecting plate 53 from the first groove 501 and be inserted into the second groove 42 of the cantilever 4 located between the two connecting plates 53. The insertion of the cantilever 4 between the two connecting plates 53 not only keeps the two sides of the cantilever 4 balanced, but also limits the movement of the cantilever 4, preventing it from moving axially along the rotation axis.

[0070] Preferably, the connecting rod 5 is integrally formed, the two connecting plates 53 are connected to the first connecting part 51 by a bending part 54, and the sides of the two connecting plates 53 are connected by a reinforcing part 55. The integrally formed connecting rod 5 has higher strength and is not easy to bend or break. The reinforcing part 55 can further improve the strength of the connecting rod 5. Of course, as another inferior embodiment, the connecting rod 5 may also be provided with only one second connecting part 52, and the cantilever 4 is provided on one side of the second connecting part 52.

[0071] Preferably, the angle between the line connecting the bottom center of the first groove 501 to the center of the first connecting hole 50 and the line connecting the center of the first connecting hole 50 and the center of the third connecting hole 56 is 67 degrees. Of course, the angle can also be adjusted appropriately, for example, using 47-87 degrees.

[0072] As shown in Figure 14, the contact support 2 is provided with a first connecting groove 23, and a second connecting groove 24 and a third connecting groove 25 are respectively provided on the opposite sides of the first connecting groove 23. The second connecting member 7 is disposed in the second connecting groove 24. One end of the connecting rod 5 with a third connecting hole 56 is inserted into the first connecting groove 23. The second connecting member 7 can pass through the third connecting hole 56 and then be inserted into the third connecting groove 25, so that the connecting rod 5 is connected to the contact support 2 through the second connecting member 7.

[0073] Furthermore, the second connector 7 includes a second mounting part 71 and a positioning part 72. The positioning part 72 is connected to a return spring 73. The return spring 73 is used to drive the second mounting part 71 through the first connecting groove 23 and into the third connecting groove 25. External force can be used by tools such as screwdrivers to drive the second connector 7 to move against the force of the return spring 73, so that the second mounting part 71 is away from the second connecting groove 23. The end of the connecting rod 5 with the third connecting hole 56 can be inserted into the second connecting groove 23 and the third connecting hole 56 is aligned with the second connector 7. After the external force disappears, the return spring 73 drives the second connector 7 to move, so that the second mounting part 71 passes through the third connecting hole 56 on the connecting rod 5 located in the second connecting groove 23, so that the connecting rod 5 is rotatably connected to the contact support 2 through the second connector 7. The connection of the second connector 7 by the return spring 73 can further reduce the assembly difficulty.

[0074] As shown in Figures 12-13, the cantilever 4 is provided with a fourth connecting hole 43 and a fifth connecting hole 44. The cantilever 4 is sleeved on the main shaft 3 through the fourth connecting hole 43 and the cantilever 4 is welded and fixed to the main shaft 3. The fifth connecting hole 44 is located on one side between the second connecting hole 41 and the fifth connecting hole 44. The fifth connecting hole 44 is connected to the drive linkage of the operating mechanism through a drive shaft (not shown in the figure). The operating mechanism drives the main shaft 3 to rotate through the drive shaft. The second groove 42 is located on the hole wall of the second connecting hole 41 near the fifth connecting hole 44.

[0075] Preferably, the angle between the line connecting the bottom center of the second groove 42 to the center of the second connecting hole 41 and the line connecting the center of the second connecting hole 41 to the center of the fourth connecting hole 43 is 36 degrees. Of course, the angle can also be adjusted appropriately, for example, 16-56 degrees.

[0076] As shown in Figure 4, the first mounting part 61 of the connector 6 is cylindrical, and the limiting part 62 is disc-shaped. One end of the first mounting part 61 is connected to the middle of the limiting part 62. A first boss 63 and a second boss 64 are respectively provided on the side of the first mounting part 61, which are radially protruding. The first boss 63 is located on the side of the first mounting part 61 away from the limiting part 62. The second boss 64 is located between the first boss 63 and the limiting part 62. The second boss 64 is spaced apart from the first boss 63 and the limiting part 62. The line connecting the first boss 63 and the second boss 64 is parallel to the axis of the connector 6. The distance between the first boss 63 and the second boss 64, and the distance between the second boss 64 and the limiting part 62, are both greater than the thickness of the second connecting part 52.

[0077] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0078] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A connection structure for a moving contact, comprising a rotatably mounted contact support (2), a moving contact (1) mounted on the contact support (2), and a main shaft (3) connected to an operating mechanism. The main shaft (3) has a cantilever (4) that rotates synchronously with the main shaft (3). The contact support (2) is connected to the cantilever (4) via a connecting rod (5). The operating mechanism can drive the main shaft (3) to rotate, causing the main shaft (3) to drive the contact support (2) to rotate. The contact support (2) then drives the moving contact (1) to contact and separate from the stationary contact. Its features are: One end of the connecting rod (5) is rotatably connected to the contact support (2), and the other end of the connecting rod (5) away from the contact support (2) is rotatably connected to the cantilever (4) through the connector (6). When the cantilever (4) rotates with the main shaft (3), it drives the contact support (2) to rotate through the connecting rod (5). The connector (6) includes a first mounting part (61) arranged parallel to the main shaft (3) and a limiting part (62) provided on one axial side of the first mounting part (61). The connecting rod (5) and the cantilever (4) are respectively provided with a first connecting hole (50) and a second connecting hole (41) for passing through the first mounting part (61). The first mounting part (61) is provided with a first boss (63) and a second boss (64) that are respectively radially protruding. The hole wall of the first connecting hole (50) is provided with a first groove (501) that can pass through the first boss (63), and the hole wall of the second connecting hole (41) is provided with a second groove (42) that can pass through the first boss (63). When the first mounting part (61) aligns the first boss (63) with the first groove (501) and the second groove (42), it can drive the first boss (63) to pass through the first connecting hole (50) and the second connecting hole (41). After the first boss (63) passes through the first connecting hole (50) and the second connecting hole (41), it is misaligned with the first groove (501), so that the connecting rod (5) and the cantilever (4) are limited along the axial direction of the first mounting part (61) between the first boss (63) and the limiting part (62). The second groove (42) of the cantilever (4) is fitted onto the second boss (64) and is circumferentially limited to the connector (6), so that the connector (6) rotates with the cantilever (4).

2. The connection structure of the moving contact according to claim 1, characterized in that: The main shaft (3) can rotate between the main shaft closed position and the main shaft open position. When the main shaft (3) is in the main shaft closed position, or in the open and closed position, or rotating between the main shaft closed position and the main shaft open position, the first boss (63) and the first groove (501) are always misaligned.

3. The connection structure of the moving contact according to claim 2, characterized in that: When the main shaft (3) drives the moving contact (1) to separate from the stationary contact to the maximum distance, that is, when the main shaft (3) rotates to the main shaft open position, the included angle α between the line connecting the top center of the first boss (63) to the center of the first connecting hole (50) and the line connecting the bottom center of the first groove (501) to the center of the first connecting hole (50) is greater than or equal to 15 degrees. When the main shaft (3) rotates from the main shaft open position to the main shaft closed position, the first boss (63) rotates in the direction of increasing included angle α. When the main shaft (3) rotates to the main shaft closed position, the included angle α is less than 180 degrees.

4. The connection structure of the moving contact according to claim 1, characterized in that: The connecting rod (5) includes a first connecting part (51) and a second connecting part (52) for connecting to the contact support (2). The second connecting part (52) includes two connecting plates (53) that are respectively connected to the first connecting part (51). The two connecting plates (53) are arranged opposite each other at a distance. The cantilever (4) can be inserted between the two connecting plates (53). The two connecting plates (53) are respectively provided with the first connecting hole (50). The second boss (64) can pass through the connecting plate (53) from the first groove (501) and be inserted into the second groove (42) of the cantilever (4) located between the two connecting plates (53).

5. The connection structure of the moving contact according to claim 4, characterized in that: The distance between the first boss (63) and the second boss (64), and the distance between the second boss (64) and the limiting part (62), are both greater than the thickness of the second connecting part (52).

6. The connection structure of the moving contact according to claim 4, characterized in that: The connecting rod (5) is integrally formed, and the two connecting plates (53) are connected to the first connecting part (51) through a bending part (54).

7. The connection structure of the moving contact according to claim 4, characterized in that: The two connecting plates (53) are connected by a reinforcing part (55) on their sides.

8. The connection structure of the moving contact according to claim 4, characterized in that: The angle between the line connecting the bottom center of the first groove (501) to the center of the first connecting hole (50) and the line connecting the center of the first connecting hole (50) and the center of the third connecting hole (56) is 47-87 degrees.

9. The connection structure of the moving contact according to claim 4, characterized in that: The first connecting part (51) is provided with a third connecting hole (56), and the second connecting member (7) passes through the third connecting hole (56) to rotatably connect the first connecting part (51) and the contact support (2).

10. The connection structure of the moving contact according to claim 9, characterized in that: The contact support (2) is provided with a first connecting groove (23). On the opposite sides of the first connecting groove (23), there are a second connecting groove (24) and a third connecting groove (25). The second connector (7) is disposed in the second connecting groove (24). One end of the connecting rod (5) with a third connecting hole (56) is inserted into the first connecting groove (23). The second connector (7) can pass through the third connecting hole (56) and be inserted into the third connecting groove (25), so that the connecting rod (5) is connected to the contact support (2) through the second connector (7).

11. The connection structure of the moving contact according to claim 10, characterized in that: The second connector (7) includes a second mounting part (71) and a positioning part (72). The positioning part (72) is connected to the return spring (73). One end of the connecting rod (5) with a third connecting hole (56) can be inserted into the second connecting groove (23) and the third connecting hole (56) is aligned with the second connector (7). The return spring (73) can drive the second connector (7) to move, so that the second mounting part (71) passes through the third connecting hole (56) on the connecting rod (5) in the second connecting groove (23) and the connecting rod (5) is rotatably connected to the contact support (2) through the second connector (7).

12. The connection structure of the moving contact according to claim 1, characterized in that: The cantilever (4) is provided with a fourth connecting hole (43) and a fifth connecting hole (44). The cantilever (4) is sleeved on the main shaft (3) through the fourth connecting hole (43) and the cantilever (4) is fixedly connected to the main shaft (3). The fifth connecting hole (44) is located on one side between the second connecting hole (41) and the fifth connecting hole (44). The fifth connecting hole (44) is connected to the operating mechanism through the drive shaft. The operating mechanism drives the main shaft (3) to rotate through the drive shaft. The second groove (42) is located on the hole wall of the second connecting hole (41) near the fifth connecting hole (44).

13. The connection structure of the moving contact according to claim 12, characterized in that: The angle between the line connecting the bottom center of the second groove (42) to the center of the second connecting hole (41) and the line connecting the center of the second connecting hole (41) to the center of the fourth connecting hole (43) is 16-56 degrees.

14. The connection structure of the moving contact according to claim 1, characterized in that: The first mounting part (61) of the connector (6) is cylindrical and the limiting part (62) is disc-shaped. One end of the first mounting part (61) is connected to the middle of the limiting part (62). A first boss (63) and a second boss (64) that protrude radially are respectively provided on the side of the first mounting part (61). The first boss (63) is located on the side of the first mounting part (61) away from the limiting part (62). The second boss (64) is located between the first boss (63) and the limiting part (62). The second boss (64) is spaced apart from the first boss (63) and the limiting part (62). The line connecting the first boss (63) and the second boss (64) is parallel to the axis of the connector (6).

15. A method for assembling the connection structure of the moving contact according to any one of claims 1-14, characterized in that, Includes the following steps: Step S1: Align the second connecting hole (41) on the cantilever (4) with the first connecting hole (50) on the connecting rod (5); Step S2: Drive the cantilever (4) to rotate through the main shaft (3), so that the second groove (42) on the cantilever (4) driven by the main shaft (3) is aligned with the first groove (501) on the connecting rod (5); Step S3: Align the connector (6) with the first connecting hole (50), and align the first boss (63) on the connector (6) with the first groove (501); Step S4: Pass the connector (6) through the first connecting hole (50) through the connecting rod (5), pass the first boss (63) through the first groove (501) and the second groove (42), and insert the second boss (64) into the second groove (42) of the cantilever (4); Step S5: Drive the cantilever (4) to rotate through the main shaft (3) so that the first boss (63) on the connector (6) is misaligned with the first groove (501).

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