Driving structure of auxiliary contact and switching electric appliance

Abstract

The driving structure of the auxiliary contact comprises an auxiliary contact mechanism and an electromagnetic system, the auxiliary contact mechanism comprises at least one auxiliary contact group and an auxiliary contact support, the auxiliary contact support can drive an auxiliary moving contact to enable the auxiliary contact group to switch an open state and a closed state, and the electromagnetic system comprises a static iron core and a moving iron core which are oppositely arranged. One end of the push rod is installed on the movable iron core, the other end is a driving part, and the push rod can drive the auxiliary contact support through the driving part when moving along with the movable iron core. And the switching device comprises a main contact mechanism, an operating mechanism and a driving structure of the auxiliary contact, and the electromagnetic system and / or the operating mechanism can drive the main contact mechanism to switch the opening and closing states. According to the driving structure of the auxiliary contact and the switching device, the push rod is installed on the movable iron core to realize the synchronous action of the push rod and the movable iron core, so that the movable iron core can push the auxiliary contact support through the push rod when moving so as to enable the auxiliary contact group to switch the opening and closing states, the structure is simple, the action relation is simple, and the driving is reliable.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a driving structure of auxiliary contacts and a switching electrical appliance. Background Art

[0002] Switching electrical appliances, especially control and protection switching electrical appliances with the ability to frequently turn on and off under load and protect circuits against overload, short circuit, locked rotor, etc., are equipped with auxiliary contacts to improve the performance of the switching electrical appliances. Their uses include monitoring the state of the switching electrical appliances and providing fault alarm signals, etc. In existing switching electrical appliances, the driving structures for driving the auxiliary contacts have problems such as many parts, complex structures, and unreliable operations.

[0003] In addition, arcs will be generated during the breaking process of the main contact mechanism. A large amount of high-temperature gas will be generated when the arcs pass through the arc extinguishing chamber. Due to the airtight shell of existing switching electrical appliances, when the switch breaks a large short-circuit current, the air pressure in the chamber where the contact mechanism is located is relatively large, which is likely to cause the shell to burst. Summary of the Invention

[0004] The purpose of the utility model is to overcome at least one defect of the prior art and provide a driving structure of auxiliary contacts and a switching electrical appliance.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The driving structure of the auxiliary contacts includes an auxiliary contact mechanism and an electromagnetic system. The auxiliary contact mechanism includes at least one auxiliary contact group and an auxiliary contact support. The auxiliary contact group includes a cooperating auxiliary moving contact and an auxiliary static contact. The auxiliary moving contact is installed on the auxiliary contact support. The auxiliary contact support can drive the auxiliary moving contact to switch the opening and closing state of the auxiliary contact group. The electromagnetic system includes a static iron core and a moving iron core arranged opposite to each other. The static iron core is fixed on the mounting base. The moving iron core is movably arranged. The moving iron core is drivingly cooperated with the auxiliary contact support through a push rod. One end of the push rod is installed on the moving iron core, and the other end of the push rod is a driving part for drivingly cooperating with the auxiliary contact support. When the push rod moves with the moving iron core, it can drive the auxiliary contact support through the driving part.

[0007] Optionally, the auxiliary contact support is located above the moving iron core and on the side close to the static iron core, and the driving part is located above the moving iron core and on the side far from the static iron core.

[0008] Optionally, two installation arms are respectively extended from both sides of the driving part and are located on both sides of the moving iron core. The two installation arms are respectively sleeved on both ends of the installation shaft passing through the moving iron core through the installation holes thereon.

[0009] Optionally, a positioning groove is provided at the connection between the driving part and the mounting arm, and a positioning boss cooperating with the positioning groove is provided on the moving iron core.

[0010] Optionally, the driving part and the two mounting arms form a U shape.

[0011] Optionally, the electromagnetic system includes a pressure plate for driving the main contact mechanism to switch between open and closed states and a reaction spring for providing an elastic reset force to the pressure plate, and the pressure plate is rotatably mounted on the moving iron core.

[0012] Optionally, one end of the pressure plate is rotatably mounted on the moving iron core, the other end of the pressure plate is a pressing part located above the main contact mechanism and used for driving the main contact mechanism, and one end of the reaction spring is connected to the mounting seat and the other end is connected to the connecting shaft in the middle of the pressure plate.

[0013] Optionally, the auxiliary contact mechanism includes four auxiliary contact groups and two auxiliary contact supports. Among them, two auxiliary contact groups are two normally open contacts sharing one auxiliary contact support, and the other two auxiliary contact groups are one normally open contact and one normally closed contact sharing the other auxiliary contact support. The driving part of the push rod drives the two auxiliary contact supports simultaneously.

[0014] A switching electrical appliance includes a main contact mechanism, an operating mechanism, and a driving structure of the auxiliary contact described in any one of the above, and the electromagnetic system and / or the operating mechanism can drive the main contact mechanism to switch between open and closed states.

[0015] Optionally, the main contact mechanism includes a main static contact, a main moving contact, a main contact support, and a main contact spring for providing a contact pressure to the main moving contact, which are installed in the housing. The two main static contacts are symmetrically arranged above the main moving contact. An installation through cavity is provided at one end of the main contact support, and a driven rod extending out of the housing is provided at the other end of the main contact support for driving and cooperating with the pressure plate of the electromagnetic system and / or the operating mechanism. The main moving contact is of a bridge type structure, the main moving contact is inserted into the installation through cavity, and both ends extend out of the installation through cavity. One moving contact is provided at each end of the main moving contact and is respectively matched with the static contacts of the two main static contacts.

[0016] The driving structure of the auxiliary contact and the switching electrical appliance of the present utility model realize the synchronous movement of the push rod and the moving iron core by installing the push rod on the moving iron core. Thus, when the moving iron core moves, it can push the auxiliary contact support through the push rod to switch the opening and closing states of the auxiliary contact group. The structure is simple, the action relationship is simple, and the driving is reliable.

[0017] In addition, the accommodating chamber where the contact mechanism is located is connected to the main exhaust channel through the gap between the arc extinguishing grids of the arc extinguishing chamber, and is also connected through the auxiliary exhaust channel. The movable part of the elastic insulating plate is movably blocked between the accommodating chamber and the auxiliary exhaust channel. When the pressure in the accommodating chamber is high, the elastic insulating plate is stretched open to release the pressure to avoid rupture of the shell maintaining the accommodating chamber. When the pressure in the accommodating chamber is normal, it remains sealed to improve the breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the electromagnetic system and the auxiliary contact mechanism of the utility model in the closed state;

[0019] Figure 2 It is a front view of the partial structure of the electromagnetic system and the auxiliary contact mechanism of the utility model in the closed state;

[0020] Figure 3 It is a top view of the electromagnetic system and the auxiliary contact mechanism of the utility model in the closed state;

[0021] Figure 4 It is a top view of the electromagnetic system of the utility model in a closed state;

[0022] Figure 5 It is a front view of the electromagnetic system and the auxiliary contact mechanism of the utility model in the disconnected state;

[0023] Figure 6 It is a front view of the partial structure of the electromagnetic system and the auxiliary contact mechanism of the utility model in the disconnected state;

[0024] Figure 7 It is a top view of the electromagnetic system and the auxiliary contact mechanism of the utility model in the disconnected state;

[0025] Figure 8 It is a side view of the movable iron core and the push rod of the utility model;

[0026] Figure 9 It is a front view of the movable iron core and the push rod of the utility model;

[0027] Figure 10 This is the other side view of the moving iron core and the push rod of the utility model;

[0028] Figure 11 It is a structural schematic diagram of the switch electrical appliance of the utility model when the electromagnetic system is in a closed state;

[0029] Figure 12 It is a structural schematic diagram of the switch electrical appliance of the utility model when the electromagnetic system is in the disconnected state;

[0030] Figure 13 It is a front view of the structure inside the shell of the utility model, showing the gas flow direction when the current is small;

[0031] Figure 14 is the front view of the internal structure of the present utility model, showing the gas flow direction under high current.

[0032] Auxiliary contact mechanism 1; auxiliary contact group 11; auxiliary moving contact; auxiliary static contact; auxiliary contact support 12; auxiliary contact spring 13; terminal 14; electromagnetic system 2; mounting base 21; static iron core 22; moving iron core 23; positioning boss 231; push rod 24; driving part 241; mounting arm 242; positioning groove 243; mounting shaft 25; pressing plate 26; pressing part 261; connecting shaft 262; reaction spring 27; operating mechanism 3; main contact mechanism 4; main static contact 41; static contact point 411; main moving contact 42; moving contact point 421; main contact support 43; driven rod 431; main contact spring 44; arc extinguishing chamber 5; housing 6; exhaust port 61; accommodation chamber 62; first channel 63; second channel 64; communication port 65; elastic insulating plate 7; fixing part 71; movable part 72. Specific embodiments

[0033] The following embodiments given in conjunction with the drawings further illustrate the driving structure of the auxiliary contact of the present utility model and the specific embodiments of the switching electrical appliance. The driving structure of the auxiliary contact of the present utility model and the switching electrical appliance are not limited to the descriptions of the following embodiments.

[0034] As Figure 1 、 Figure 11 and Figure 12 shown, the switching electrical appliance of this embodiment includes a main contact mechanism 4, an operating mechanism 3 and a driving structure of an auxiliary contact. The driving structure of the auxiliary contact of this embodiment is applicable to control and protection switching electrical appliances, such as contactors and circuit breakers. The driving structure of the auxiliary contact includes an auxiliary contact mechanism 1 and an electromagnetic system 2. The electromagnetic system 2 and / or the operating mechanism 3 of the driving structure can drive the main contact mechanism 4 to switch between open and closed states. The switching electrical appliance of this embodiment has both an electric mode in which the main contact mechanism 4 is driven by the electromagnetic system 2 and a manual mode in which the main contact mechanism 4 is driven by the operating mechanism 3. The action principle of the electromagnetic system 2 is prior art. The on-off state of the electromagnetic system 2 is electrically switched by the change of the coil current of the electromagnetic system 2, so that the electromagnetic system 2 drives the main contact mechanism 4 to switch between open and closed states; the structure and action principle of the operating mechanism 3 of this embodiment are prior art. By manually operating the handle outside the operating mechanism 3, the operating mechanism 3 drives the tripping structure to control the main contact mechanism 4 to switch between open and closed states, which will not be elaborated here.

[0035] As Figures 1-7As shown, the auxiliary contact mechanism 1 includes at least one auxiliary contact group 11 and an auxiliary contact support 12, and further includes an auxiliary contact spring 13 that provides an elastic reset force for the auxiliary contact support 12. The auxiliary contact group 11 includes a cooperating auxiliary moving contact and an auxiliary static contact. The auxiliary moving contact is installed on the auxiliary contact support 12. The auxiliary contact support 12 can drive the auxiliary moving contact to contact or separate from the auxiliary static contact, so that the auxiliary contact group 11 switches between open and closed states. The electromagnetic system 2 includes a static iron core 22 and a moving iron core 23 that are oppositely arranged. The static iron core 22 is fixed on the mounting base 21. The auxiliary static contacts of multiple groups of auxiliary contact groups 11 and their corresponding terminal blocks 14 are fixed on the PCB board as a whole, and this whole is fixed on the mounting base 21. The moving iron core 23 is movably arranged.

[0036] Specifically, the moving iron core 23 is drivingly cooperated with the auxiliary contact support 12 through a push rod 24. One end of the push rod 24 is installed on the moving iron core 23, and the other end of the push rod 24 is a driving portion 241 for drivingly cooperating with the auxiliary contact support 12. When the auxiliary contact spring 13 is in its original state, the auxiliary contact support 12 contacts the driving portion 241. When the push rod 24 moves with the moving iron core 23, it can drive the auxiliary contact support 12 through the driving portion 241. Of course, it can also be that when the auxiliary contact spring 13 is in its original state, the auxiliary contact support 12 and the driving portion 241 are arranged at an interval relative to each other.

[0037] As Figures 2-4 shown, when the moving iron core 23 moves leftward to be attracted to the static iron core 22, the push rod 24 moves leftward with the moving iron core 23, so that the driving portion 241 of the push rod 24 pushes the auxiliary contact support 12 to move leftward, so that the auxiliary moving contact moves leftward with the auxiliary contact support 12 to switch states with the auxiliary static contact (from the contact state to the separated state, or from the separated state to the contact state). At the same time, the movement of the auxiliary contact support 12 stores energy in the auxiliary contact spring 13; As Figure 6 and Figure 7 shown, when the moving iron core 23 moves rightward to be repelled from the static iron core 22, the push rod 24 moves rightward with the moving iron core 23, so that the driving portion 241 of the push rod 24 moves rightward, so that the auxiliary contact spring 13 releases energy to drive the auxiliary contact support 12 to move rightward, and the auxiliary moving contact moves rightward with the auxiliary contact support 12 to switch states with the auxiliary static contact (from the separated state to the contact state, or from the contact state to the separated state). The driving structure of the auxiliary contact and the switching electrical appliance in this embodiment realize the synchronous movement of the push rod 24 and the moving iron core 23 by installing the push rod 24 on the moving iron core 23. Thus, when the moving iron core 23 moves, it can push the auxiliary contact support 12 through the push rod 24 to switch the open and closed states of the auxiliary contact group 11. The structure is simple, the action relationship is simple, and the driving is reliable.

[0038] AsFigure 2 and Figure 6 As shown in Figure 6 , the auxiliary contact support 12 is located above the moving iron core 23 and close to one side of the static iron core 22, and the driving part 241 of the push rod 24 is located above the moving iron core 23 and far from one side of the static iron core 22. The structure is simple, and the layout between the moving iron core 23, the push rod 24 and the auxiliary contact support 12 is compact, saving occupied space.

[0039] As Figures 8-10 shown in Figures 8-10 , for the installation structure between the push rod 24 and the moving iron core 23 in this embodiment, two installation arms 242 located on both sides of the moving iron core 23 are respectively formed by downward extension on both sides of the driving part 241 of the push rod 24. The driving part 241 and the two installation arms 242 are preferably in a U shape, so that the structure of the push rod 24 and the moving iron core 23 is more compact and interference with other parts is avoided. The two installation arms 242 are respectively sleeved on both ends of the installation shaft 25 passing through the moving iron core 23 through the installation holes thereon. The push rod 24 and the moving iron core 23 in this embodiment are fixed by the installation shaft 25, with a simple structure, convenient installation and firm and reliable installation. Of course, the push rod 24 and the moving iron core 23 can also be fixedly connected by clamping or other methods.

[0040] Furthermore, a positioning groove 243 is provided at the connection between the driving part 241 and the installation arm 242, and a positioning boss 231 matched with the positioning groove 243 is provided on the moving iron core 23. The positioning groove 243 of the push rod 24 is matched with the positioning boss 231 of the moving iron core 23, playing a role in installation positioning and facilitating the rapid assembly of the push rod 24 and the moving iron core 23.

[0041] As Figure 3 and Figure 7 shown in Figure 3 and Figure 7 , the auxiliary contact mechanism 1 includes four auxiliary contact groups 11 and two auxiliary contact supports 12. Among them, two auxiliary contact groups 11 are two normally open contacts sharing one auxiliary contact support 12, and the other two auxiliary contact groups 11 are one normally open contact and one normally closed contact sharing the other auxiliary contact support 12, used to meet different signal requirements. The driving part 241 of the push rod 24 drives the two auxiliary contact supports 12 at the same time. The normally open contact means that it is in a closed state when the moving iron core 23 and the static iron core 22 are attracted, and in an open state when the moving iron core 23 and the static iron core 22 are repelled; the normally closed contact means that it is in an open state when the moving iron core 23 and the static iron core 22 are attracted, and in a closed state when the moving iron core 23 and the static iron core 22 are repelled.

[0042] As Figure 4 、 Figure 11 and Figure 12As shown in the figure, the driving structure between the electromagnetic system 2 and the main contact mechanism 4 in this embodiment. The electromagnetic system 2 includes a pressing plate 26 for driving the main contact mechanism 4 to switch between the open and closed states, and a reaction spring 27 for providing an elastic reset force for the pressing plate 26. The pressing plate 26 is rotatably mounted on the moving iron core 23. One end of the pressing plate 26 is rotatably mounted on the moving iron core 23, and the other end of the pressing plate 26 is a pressing portion 261 located above the main contact mechanism 4 and used to drive the main contact mechanism 4. One end of the reaction spring 27 is connected to the mounting base 21, and the other end is connected to the connecting shaft 262 in the middle of the pressing plate 26.

[0043] As Figure 13 and Figure 14 shown in the figure, the main contact mechanism 4 includes two main static contacts 41, a main moving contact 42, a main contact support 43 mounted in the housing 6, and a main contact spring 44 for providing a contact pressure for the main moving contact 42. The two main static contacts 41 are symmetrically arranged above the main moving contact 42. An installation through cavity is provided at one end of the main contact support 43, and a driven rod 431 extending out of the housing 6 is provided at the other end of the main contact support 43 for driving cooperation with the pressing plate 26 of the electromagnetic system 2 and / or the operating mechanism 3. The main moving contact 42 is of a bridge type structure. The main moving contact 42 is inserted into the installation through cavity, and both ends extend out of the installation through cavity. A moving contact 421 is provided at each end of the main moving contact 42, which respectively cooperates with the static contacts 411 of the two main static contacts 41.

[0044] As Figure 11 shown in the figure, when the moving iron core 23 moves leftward to be attracted to the static iron core 22, the reaction spring 27 releases energy to make the pressing plate 26 swing upward, so that the pressing portion 261 of the pressing plate 26 moves away from the driven rod 431 of the main contact support 43, enabling the main contact spring 44 to release energy to drive the main moving contact 42 to move upward to close with the main static contact 41 (i.e., the main contact mechanism 4 is in the closed state); as Figure 12 shown in the figure, when the moving iron core 23 moves rightward to be repelled from the static iron core 22, the pressing plate 26 swings downward, so that the pressing portion 261 of the pressing plate 26 presses against the driven rod 431 of the main contact support 43, causing the main contact support 43 to drive the main moving contact 42 to move downward to disconnect from the main static contact 41 (i.e., the main contact mechanism 4 is in the open state), and at the same time the reaction spring 27 stores energy.

[0045] As Figure 13 and Figure 14As shown in the figure, the switching device of this embodiment further includes an arc extinguishing chamber 5 installed in the housing 6. One side of the arc extinguishing chamber 5 close to the main contact mechanism 4 is the incoming arc side, and the other side far from the main contact mechanism 4 is the exhaust side. The housing 6 is provided with an exhaust port 61 and a receiving chamber 62 located on the incoming arc side of the arc extinguishing chamber 5 and used to accommodate the main contact mechanism 4. A first channel 63 serving as the main exhaust channel is formed between the exhaust side of the arc extinguishing chamber 5 and the exhaust port 61 of the housing 6. The receiving chamber 62 and the first channel 63 are in clearance communication through the arc extinguishing grid plate gap of the arc extinguishing chamber 5. The receiving chamber 62 and the first channel 63 are also communicated through a second channel 64 located below the arc extinguishing chamber 5. The second channel 64 and the receiving chamber 62 are communicated through a communication port 65, so that the second channel 64 serves as an auxiliary exhaust channel. An elastic insulating plate 7 is provided in the second channel 64. The elastic insulating plate 7 includes a fixed part 71 and a movable part 72. When the elastic insulating plate 7 is in its original state, the movable part 72 covers the communication port 65; when the elastic insulating plate 7 is deformed, the movable part 72 moves in a direction away from the communication port 65.

[0046] As Figure 13 shown, when breaking normal load current and small short-circuit current, the air pressure in the receiving chamber 62 is small and is not sufficient to push open the movable part 72 of the elastic insulating plate 7. The arc gas normally passes through the arc extinguishing grid plate gap of the arc extinguishing chamber 5, enters the first channel 63, and finally is discharged from the housing 6 through the exhaust port 61; As Figure 14 shown, when breaking a large short-circuit current, the air pressure in the receiving chamber 62 is large. The arc gas pushes open the movable part 72 of the elastic insulating plate 7, and part of the gas passes through the opening generated by the deformation of the elastic insulating plate 7, enters the first channel 63 through the second channel 64, and finally is discharged from the housing 6 through the exhaust port 61. The receiving chamber 62 where the contact mechanism is located is communicated with the main exhaust channel (the first channel 63) through the arc extinguishing grid plate gap of the arc extinguishing chamber 5 and is also communicated through the auxiliary exhaust channel (the second channel 64). Moreover, the movable part 72 of the elastic insulating plate 7 is movably blocked between the receiving chamber 62 and the auxiliary exhaust channel. When the pressure in the receiving chamber 62 is large, the elastic insulating plate 7 is pushed open to relieve pressure, so as to avoid the rupture of the housing 6 maintaining the receiving chamber 62, and when the pressure in the receiving chamber 62 is normal, it remains airtight to improve the breaking capacity.

[0047] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is habitually placed during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0048] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. Driving structure of auxiliary contact, comprising an auxiliary contact mechanism (1) and an electromagnetic system (2), wherein the auxiliary contact mechanism (1) includes at least one auxiliary contact group (11) and an auxiliary contact support (12), the auxiliary contact group (11) includes a cooperating auxiliary moving contact and an auxiliary static contact, the auxiliary moving contact is installed on the auxiliary contact support (12), the auxiliary contact support (12) can drive the auxiliary moving contact to switch the opening and closing state of the auxiliary contact group (11), the electromagnetic system (2) includes a static iron core (22) and a moving iron core (23) arranged opposite to each other, the static iron core (22) is fixed on a mounting seat (21), the moving iron core (23) is movably arranged, characterized in that: The moving iron core (23) is drivingly engaged with the auxiliary contact support (12) through a push rod (24). One end of the push rod (24) is mounted on the moving iron core (23), and the other end of the push rod (24) is a driving portion (241) for drivingly engaging with the auxiliary contact support (12). When the push rod (24) moves with the moving iron core (23), it can drive the auxiliary contact support (12) through the driving portion (241).

2. The driving structure of the auxiliary contact according to claim 1, wherein: The auxiliary contact support (12) is located above the moving iron core (23) and on the side close to the static iron core (22), and the driving portion (241) is located above the moving iron core (23) and on the side far from the static iron core (22).

3. The driving structure of the auxiliary contact according to claim 1, characterized in that: Two mounting arms (242) located on both sides of the moving iron core (23) are respectively formed by extending both sides of the driving portion (241), and the two mounting arms (242) are respectively sleeved on both ends of a mounting shaft (25) passing through the moving iron core (23) through the mounting holes thereon.

4. The driving structure of the auxiliary contact according to claim 3, characterized in that: A positioning groove (243) is provided at the connection between the driving portion (241) and the mounting arm (242), and a positioning boss (231) cooperating with the positioning groove (243) is provided on the moving iron core (23).

5. The driving structure of the auxiliary contact according to claim 3, characterized in that: The driving portion (241) and the two mounting arms (242) form a U shape.

6. The driving structure of the auxiliary contact according to claim 1, characterized in that: The electromagnetic system (2) includes a pressing plate (26) for driving the main contact mechanism (4) to switch between open and closed states and a reaction spring (27) for providing an elastic restoring force for the pressing plate (26), and the pressing plate (26) is rotatably mounted on the moving iron core (23).

7. The driving structure of the auxiliary contact according to claim 6, characterized in that: One end of the pressing plate (26) is rotatably mounted on the moving iron core (23), the other end of the pressing plate (26) is a pressing portion (261) located above the main contact mechanism (4) and for driving the main contact mechanism (4), and one end of the reaction spring (27) is connected to the mounting seat (21), and the other end is connected to a connecting shaft (262) in the middle of the pressing plate (26).

8. The driving structure of the auxiliary contact according to claim 1, characterized in that: The auxiliary contact mechanism (1) includes four auxiliary contact groups (11) and two auxiliary contact supports (12). Among them, two auxiliary contact groups (11) are two normally open contacts sharing one auxiliary contact support (12), and the other two auxiliary contact groups (11) are one normally open contact and one normally closed contact sharing the other auxiliary contact support (12), and the driving portion (241) of the push rod (24) drives the two auxiliary contact supports (12) simultaneously.

9. Switching device, characterized in that: It includes a main contact mechanism (4), an operating mechanism (3) and a driving structure of the auxiliary contact according to any one of claims 1-8, and the electromagnetic system (2) and / or the operating mechanism (3) can drive the main contact mechanism (4) to switch between open and closed states.

10. The switching device according to claim 9, characterized in that: The main contact mechanism (4) includes a main static contact (41), a main moving contact (42), a main contact support (43) installed in the housing (6), and a main contact spring (44) that provides contact pressure for the main moving contact (42). The two main static contacts (41) are symmetrically arranged above the main moving contact (42). One end of the main contact support (43) is provided with an installation through cavity, and the other end of the main contact support (43) is provided with a driven rod (431) extending out of the housing (6) for driving cooperation with the pressure plate (26) of the electromagnetic system (2) and / or the operating mechanism (3). The main moving contact (42) is of a bridge structure. The main moving contact (42) is inserted into the installation through cavity, with both ends extending out of the installation through cavity. Each end of the main moving contact (42) is provided with a moving contact (421), which respectively cooperates with the static contacts (411) of the two main static contacts (41).

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