Auxiliary contact structure and contactor

Abstract

Auxiliary contact structure, including normally closed auxiliary contact, normally open auxiliary contact and auxiliary push rod, normally closed auxiliary contact, normally open auxiliary contact respectively including two auxiliary spring leaf, auxiliary push rod drives normally closed auxiliary contact and normally open auxiliary contact switch different state simultaneously.The auxiliary contact structure of the application, the support part of the auxiliary spring leaf is arranged to play a supporting role, and the first clamping arm and the second clamping arm are formed by extending through the support part, which is used for reliably clamping the wire.The contactor has a static contact and a moving contact as main contacts, a normally closed auxiliary contact for cutting off a starting coil, and a normally open auxiliary contact for monitoring the on-off state of the main contacts.The contactor also has a double-coil structure composed of a starting coil and a holding coil, which has high power starting, low power holding, low power consumption and low coil temperature rise;the auxiliary push rod is used to drive the normally closed auxiliary contact to realize mechanical switching of the starting coil and the holding coil, and the circuit board is saved, thereby reducing the product cost.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to an auxiliary contact structure and a contactor. Background Technology

[0002] Existing DC contactor auxiliary contact structures suffer from unreliable connections between the auxiliary spring and auxiliary lead wires, leading to frequent intermittent connections. This can cause auxiliary switching malfunctions after mechanical vibration or repeated opening and closing of the DC contactor. Furthermore, the auxiliary spring's positioning is unreliable, and it can easily detach from its mounting base, resulting in auxiliary switching failure. Additionally, the typical DC contactor auxiliary spring is led out of the product via a lead wire, then connected to the coil lead wire via a conductor, and finally connected to the first spring contact. This complex connection method results in high costs and low assembly efficiency.

[0003] Existing DC contactors have the following drawbacks: ① The starting power is used as the holding power, resulting in high power consumption and large coil temperature rise; ② Switching between the starting and holding coils using a circuit board increases the number of circuit boards and thus product costs, and the ICs and MOS on the circuit board are often damaged by external current (surges); ③ The auxiliary contacts are sacrificed to switch between the starting and holding coils. In the new energy field, DC contactors often need to have auxiliary contacts, which greatly reduces the application range of the product. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and to provide an auxiliary contact structure and a contactor.

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

[0006] The auxiliary contact structure includes a normally closed auxiliary contact, a normally open auxiliary contact, and an auxiliary push rod mounted on a shielding shell. The normally closed auxiliary contact includes two auxiliary springs that serve as a moving parting spring and a moving parting stationary spring, respectively. The normally open auxiliary contact includes two auxiliary springs that serve as a moving closing spring and a moving closing stationary spring, respectively. The auxiliary push rod drives and cooperates with the moving parting spring and the moving closing spring, enabling the moving parting spring to disconnect from the moving parting spring and simultaneously drive the moving closing spring to close from the moving closing stationary spring. The shielding shell has a mounting cavity for mounting the auxiliary springs. The auxiliary springs include a horizontally arranged contact portion and a support portion, which are connected in a straight line. The side of the support portion away from the contact portion extends downward to form a first clamping arm, and the other side of the support portion near the contact portion extends downward to form a second clamping arm. The second clamping arm is inclined and approaches the first clamping arm in a downward direction. There is a wiring space between the first clamping arm and the second clamping arm.

[0007] Optionally, the mounting cavity has a first sidewall and a second sidewall opposite to each other, the first clamping arm and the second clamping arm are placed between the first sidewall and the second sidewall, the first sidewall is provided with a limiting surface, the first clamping arm abuts against the second sidewall and is opposite to the first sidewall, the end of the first clamping arm is bent upward to form a bent arm, and the bent arm is inclined and close to the first sidewall in the upward direction, and the bent arm abuts against the limiting surface.

[0008] Optionally, a limiting protrusion is provided on the second sidewall, and a limiting hole is provided on the first clamping arm that communicates with the wiring space, and the limiting protrusion is inserted into the limiting hole.

[0009] Optionally, the first clamping arm includes a fixed section connected to the support portion and a contact section connected between the fixed section and the bending arm. The fixed section is attached to the second side wall, and a receiving gap is formed between the contact section and the second side wall. The side of the contact section facing the second side wall is the first contact surface.

[0010] Optionally, the first sidewall is provided with a stop surface opposite to the second clamping arm, the stop surface being inclined and approaching the second sidewall in a downward direction.

[0011] Optionally, the side wall of the mounting cavity is provided with guide ribs, and the side of the support is provided with guide grooves that slide with the guide ribs.

[0012] Optionally, one end of the auxiliary push rod extends outward to form an extension arm, and the extension arm is provided with a first driving part for driving the moving split spring. The contact part of the moving split spring is located above the contact part of the moving split stationary spring and the first driving part. The other end of the auxiliary push rod is provided with a notch, and the notch is provided with a second driving part for driving the moving closing spring. The contact part of the moving closing spring is located below the contact part of the moving closing stationary spring and above the second driving part.

[0013] Optionally, the contact portions of the moving split spring and the moving split stationary spring overlap to form a V-shape; the contact portions of the moving closing spring and the moving closing stationary spring overlap to form a V-shape.

[0014] Optionally, the mounting cavity includes a horizontal cavity disposed on the top surface of the shielding shell and a vertical cavity that communicates with the horizontal cavity in an L-shape and penetrates downward through the shielding shell. The contact portion and the support portion are placed in the horizontal cavity, and the first clamping arm and the second clamping arm are placed between the first sidewall and the second sidewall opposite to each other in the vertical cavity. The top surface of the shielding shell is provided with a mounting groove that communicates with the horizontal cavity and cooperates with the auxiliary push rod. The bottom wall of the mounting groove is provided with a guide hole that communicates with the inside of the shielding shell for sliding cooperation with the guide portion of the auxiliary push rod.

[0015] The auxiliary contact structure of the present invention has an auxiliary spring with a support portion that provides support, and the support portion extends to form opposing first and second clamping arms for clamping the wire. The wire clamping structure of the auxiliary spring is simple and achieves a reliable connection between the auxiliary spring and the wire.

[0016] Furthermore, the bending arm mates with the limiting surface to limit and support the movement of the auxiliary spring, preventing it from dislodging when the auxiliary push rod pushes the contact part. The limiting protrusion and the limiting hole engage to further secure the auxiliary spring and prevent it from dislodging.

[0017] Furthermore, the receiving gap between the contact section and the second sidewall provides a contact area with the first spring, enabling a reliable and low-cost connection with the first spring. The barbed connecting part of the first spring is interference-fitted with the receiving gap, and the contact pressure generated by the deformation of the hook part achieves a reliable connection between the auxiliary spring and the first spring.

[0018] A contactor includes an electromagnetic system, a shielding housing, two stationary contacts disposed within the shielding housing, a moving contact piece for forming two moving contacts, and a guide rod for driving the moving contact piece to move up and down to open and close with the stationary contacts. It also includes an auxiliary contact structure as described in any one of the above. Simultaneously, the guide rod drives the moving contact piece to close with the stationary contacts, and through an auxiliary push rod of the auxiliary contact structure, drives the normally open auxiliary contact's normally open moving spring to close with its normally open stationary spring. The electromagnetic system includes a starting coil and a holding coil connected in parallel. The starting coil is connected in series with the normally closed auxiliary contact of the auxiliary contact structure. The guide rod drives the normally closed auxiliary contact's normally open moving spring to disconnect from its normally open stationary spring through the auxiliary push rod.

[0019] Optionally, the moving contact is positioned in the middle of the shielding shell, the guide rod passes through the moving contact and is spaced apart from the auxiliary push rod located above the moving contact, the two stationary contacts are positioned opposite each other above the two moving contacts at both ends of the moving contact, and the normally open auxiliary contact and normally closed auxiliary contact are located on both sides of the moving contact.

[0020] Optionally, the electromagnetic system further includes a coil frame, two first spring contacts mounted on the coil frame, and a second spring contact. The starting coil is sleeved on the coil frame, and the holding coil is sleeved on the starting coil. The two first spring contacts are symmetrically arranged on both sides of the second spring contact. One end of one first spring contact is connected to one end of the holding coil, and the other end is connected to the moving-stable spring contact. One end of the other first spring contact is connected to one end of the starting coil, and the other end is connected to the moving-moving spring contact. One end of the second spring contact is connected to the other end of the starting coil and the other end of the holding coil. The wiring space of the other end of the second spring contact and the moving-stable spring contact is used for external connection.

[0021] Optionally, the first spring includes a connecting portion that extends into the shielding shell and is interference-fitted between the contact section of the auxiliary spring and the second sidewall of the mounting cavity.

[0022] Optionally, the connecting part is a barb structure with a hook, and the side of the connecting part facing away from the hook is a second contact surface. The second contact surface is in contact with the first contact surface of the contact segment, and the hook rests against the second side wall.

[0023] The contactor in this embodiment has a compact and rationally laid-out structure, featuring stationary contacts and moving contacts as main contacts, normally closed auxiliary contacts for cutting off the start-up coil, and normally open auxiliary contacts for monitoring the on / off state of the main contacts. It also features a dual-coil structure consisting of a start-up coil and a holding coil, enabling high-power start-up and low-power holding, resulting in low power consumption and minimal coil temperature rise. An auxiliary push rod drives the normally closed auxiliary contacts to mechanically switch between the start-up coil and the holding coil, eliminating the need for a circuit board and thus reducing product costs. It also eliminates the risk of contactor failure due to IC or MOS damage. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of one part of the contactor of the present invention;

[0025] Figure 2 This is a cross-sectional view of another part of the contactor of the present invention;

[0026] Figure 3 This is the present invention. Figure 2 Enlarged view of a local structure in the middle;

[0027] Figure 4 This is a view of the auxiliary reed of the present invention;

[0028] Figure 5 This is a perspective view of the auxiliary reed of the present invention;

[0029] Figure 6 This is a schematic diagram of the shielding shell portion of the present invention;

[0030] Figure 7 This is a schematic diagram of the shielding shell of the present invention;

[0031] Figure 8 This is a schematic diagram of the auxiliary push rod of the present invention;

[0032] Figure 9 This is an assembly drawing of the electromagnetic system of the present invention;

[0033] Figure 10 This is a partial exploded view of the electromagnetic system of the present invention;

[0034] Figure 11 This is a schematic diagram of the structure of the first spring of the present invention.

[0035] Shielding shell 1; Horizontal cavity 11; Vertical cavity 12; First sidewall 13; Limiting surface 131; Stop surface 132; Second sidewall 14; Limiting protrusion 141; Guide rib 15; First through hole 16; Slide groove 17; Guide hole 18; Normally closed auxiliary contact 2A; Normally open auxiliary contact 2B; Auxiliary spring 2; Contact part 21; Support part 22; Guide groove 222; Second clamping arm 23; First clamping arm 24; Fixed section 241; Limiting hole 241a; Contact Section 242; First contact surface 242a; Bending arm 25; Accommodation gap 26; Wiring space 27; Static contact 3; Moving contact piece 4; Guide rod 5; Auxiliary push rod 6; Extension arm 61; First drive part 62; Notch 63; Second drive part 64; Guide part 65; Coil frame 7; Starting coil 8A; Holding coil 8B; First spring piece 9; Connecting part 91; Hook part 911; Second contact surface 912; Mounting part 92; Wiring part 93; Second spring piece 10. Detailed Implementation

[0036] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the auxiliary contact structure and contactor of the present invention. The auxiliary contact structure and contactor of the present invention are not limited to the descriptions in the following embodiments.

[0037] like Figures 1-2 , Figure 4 As shown, the contactor in this embodiment includes an auxiliary contact structure, an electromagnetic system, a shielding shell 1, two stationary contacts 3 disposed within the shielding shell 1, a moving contact piece 4 forming two moving contacts, and a guide rod 5 for driving the moving contact piece 4 to move up and down to open and close with the stationary contacts 3. The electromagnetic system includes a moving iron core and a magnetic yoke disposed opposite to each other. The moving iron core is linked to the guide rod 5. The electromagnetic system also includes a starting coil 8A and a holding coil 8B disposed in parallel. The starting coil 8A is connected in series with the normally closed auxiliary contact 2A of the auxiliary contact structure. The auxiliary contact structure includes a normally closed auxiliary contact 2A, a normally open auxiliary contact 2B, and an auxiliary push rod 6 mounted on the shielding shell 1. The normally closed auxiliary contact 2A includes two auxiliary springs 2 that serve as a moving spring for moving and a stationary spring for moving, respectively. The normally open auxiliary contact 2B includes two auxiliary springs 2 that serve as a moving spring for moving and a stationary spring for moving, respectively.

[0038] When the starting coil 8A and the holding coil 8B are energized, the moving iron core moves upward and is attracted to the magnetic yoke. The moving iron core drives the guide rod 5, which drives the moving contact 4 to close with the stationary contact 3. At the same time, the guide rod 5 drives the normally open auxiliary contact 2B to close with the normally open stationary contact through the auxiliary push rod 6 of the auxiliary contact structure. That is, the on / off state of the normally open auxiliary contact 2B is consistent with the on / off state between the moving contact 4 and the stationary contact 3. At the same time, the guide rod 5 drives the normally closed auxiliary contact 2A to open with the normally closed stationary contact through the auxiliary push rod 6, thereby cutting off the starting coil 8A. That is, the starting coil 8A stops working, while the holding coil 8B continues to work.

[0039] like Figures 1-2 , Figure 6 As shown, the moving contact 4 is positioned in the middle within the shielding shell 1. The guide rod 5 passes through the moving contact 4 and is spaced apart from the auxiliary push rod 6 located above the moving contact 4. The two stationary contacts 3 are positioned opposite each other above the two moving contacts at both ends of the moving contact 4. The normally open auxiliary contact 2B and normally closed auxiliary contact 2A are located on both sides of the moving contact 4. The contactor of this embodiment has a compact and reasonable layout, with stationary contacts 3 and moving contact 4 as main contacts, normally closed auxiliary contact 2A for cutting off the start coil 8A, and normally open auxiliary contact 2B for monitoring the on / off state of the main contacts. It also has a dual-coil structure consisting of a start coil 8A and a holding coil 8B, which enables high-power start-up, low-power holding, low power consumption, and low coil temperature rise. The auxiliary push rod 6 drives the normally closed auxiliary contact 2A to achieve mechanical switching between the start coil 8A and the holding coil 8B, eliminating the need for a circuit board and thus reducing product costs. There is no risk of contactor failure due to IC or MOS damage.

[0040] like Figures 6-7 As shown, the shielding shell 1 includes a shielding cover and a shielding base plate. The shielding cover and the shielding cover plate are fitted together to form a closed space for extinguishing the arc. The shielding shell 1 is provided with a first through hole 16 for the stationary contact 3 to pass through, a mounting groove 17 for cooperating with the auxiliary push rod 6, and a mounting cavity for mounting the auxiliary spring 2. The first through hole 16 and the mounting groove 17 are provided on the top surface of the shielding shell 1. The bottom wall of the mounting groove 17 is provided with a guide hole 18 communicating with the inside of the shielding shell 1.

[0041] like Figures 3-5As shown, the auxiliary spring 2 of this embodiment has a specific structure. The auxiliary spring 2 includes a horizontally arranged contact portion 21 and a support portion 22, which are connected in a straight line. The side of the support portion 22 away from the contact portion 21 extends downward to form a first clamping arm 24, and the other side of the support portion 22 near the contact portion 21 extends downward to form a second clamping arm 23. The second clamping arm 23 is in the shape of a "reed tongue" and is inclined, approaching the first clamping arm 24 in a downward direction. A wiring space 27 is provided between the first clamping arm 24 and the second clamping arm 23 for clamping wires. The wiring space 27 is elastic; during wiring, the end of the second clamping arm 23 is pushed apart by the wire, increasing the distance between it and the first clamping arm 24, thus achieving elastic wire clamping between the first clamping arm 24 and the second clamping arm 23. In practical applications, depending on the size of the wire, the distance between the end of the second clamping arm 23 and the second clamping arm 23 can be set to be greater than or equal to zero (that is, the end of the second clamping arm 23 abuts against or is spaced apart from the second clamping arm 23). In the auxiliary contact structure of this embodiment, the auxiliary spring 2 is provided with a support portion 22 that provides support, and the support portion 22 extends to form opposing first clamping arms 24 and second clamping arms 23 for clamping the wire. The wire clamping structure of the auxiliary spring 2 is simple, and a reliable connection between the auxiliary spring 2 and the wire is achieved.

[0042] like Figures 3-7 As shown, in this embodiment, the mounting structure of the auxiliary spring 2 includes a mounting cavity of the shielding shell 1 with opposing first sidewalls 13 and 14. A first clamping arm 24 and a second clamping arm 23 are positioned between the first sidewalls 13 and 14. A limiting surface 131 is provided on the first sidewall 13. The first clamping arm 24 abuts against the second sidewall 14 and is opposite to the first sidewall 13. The end of the first clamping arm 24 is bent upwards to form a bent arm 25, which is inclined and moves towards the first sidewall 13 in an upward direction. The bent arm 25 abuts against the limiting surface 131. The bent arm 25 cooperates with the limiting surface 131 to limit and support the movement of the auxiliary spring 2, preventing it from dislodging when the auxiliary push rod 6 pushes the contact part 21. A guide rib 15 is provided on the sidewall of the mounting cavity, and a guide groove 222 that slides with the guide rib 15 is provided on the side of the support part 22 to guide the movement of the auxiliary spring 2.

[0043] Furthermore, the second sidewall 14 is provided with a limiting protrusion 141, and the first clamping arm 24 is provided with a limiting hole 241a communicating with the wiring space 27. The limiting protrusion 141 is engaged with the limiting hole 241a. The limiting protrusion 141 and the limiting hole 241a engage to further fix the auxiliary spring 2 and prevent the auxiliary spring 2 from falling out.

[0044] like Figure 3As shown, the first sidewall 13 is provided with a stop surface 132 opposite to the second clamping arm 23. The stop surface 132 is inclined and close to the second sidewall 14 in a downward direction. Specifically, the first sidewall 13 is provided with a triangular protrusion, the upper side of which is the stop surface 132, and the lower side of which is the limiting surface 131.

[0045] like Figures 3-5 As shown, the first clamping arm 24 includes a fixed section 241 connected to the support portion 22 and a contact section 242 connecting the fixed section 241 and the bending arm 25. The fixed section 241 is attached to the second sidewall 14, and a receiving gap 26 is formed between the contact section 242 and the second sidewall 14. The side of the contact section 242 facing the second sidewall 14 is a first contact surface 242a for connecting with the first spring 9. The receiving gap 26 between the contact section 242 and the second sidewall 14 provides a contact portion with the first spring 9, achieving a reliable and low-cost connection with the first spring 9.

[0046] like Figure 1 , Figure 6-8 As shown, the bottom surface of the auxiliary push rod 6 is provided with a protruding guide portion 65, which slides in conjunction with the guide hole 18 of the shielding shell 1. One end of the auxiliary push rod 6 extends outward to form an extension arm 61, and the extension arm 61 is provided with a first driving portion 62 for driving the moving split spring. The contact portion 21 of the moving split spring is located above the contact portion 21 of the moving split stationary spring and the first driving portion 62. The other end of the auxiliary push rod 6 is provided with a notch 63, and the notch 63 is provided with a second driving portion 64 for driving the moving closing spring. The contact portion 21 of the moving closing spring is located below the contact portion 21 of the moving closing stationary spring and above the second driving portion 64. The contact portions 21 of the moving split spring and the moving split stationary spring overlap to form a V-shape arrangement between the moving split spring and the moving split stationary spring; the contact portions 21 of the moving closing spring and the moving closing stationary spring overlap to form a V-shape arrangement between the moving closing spring and the moving closing stationary spring.

[0047] like Figures 6-7As shown, the mounting cavity of the shielding shell 1 includes a horizontal cavity 11 disposed on the top surface of the shielding shell 1 and a vertical cavity 12 that communicates with the horizontal cavity 11 in an L-shape and penetrates downward through the shielding shell 1. The horizontal cavity 11 is connected to the mounting groove 17. The contact part 21 and the support part 22 are placed inside the horizontal cavity 11. The first clamping arm 24 and the second clamping arm 23 are placed between the first sidewall 13 and the second sidewall 14 opposite to each other in the vertical cavity 12. Specifically, the shielding shell 1 has two sets of mounting cavities corresponding to the normally closed auxiliary contact 2A and the normally open auxiliary contact 2B, respectively. Each set of mounting cavities includes two mounting cavities corresponding to the two auxiliary springs 2. The horizontal cavities 11 of the two mounting cavities are connected in a V-shape. The two mounting cavities extend from the periphery of the shielding shell 1 to the mounting groove 17 and converge on one side of the mounting groove 17. The apex of the V-shape is the connection point of the two mounting cavities.

[0048] like Figures 9-10 As shown, the connection structure between the starting coil 8A and the holding coil 8B and the normally closed auxiliary contact 2A in this embodiment is as follows: The electromagnetic system also includes a coil frame 7, two first spring pieces 9 and a second spring piece 10 mounted on the coil frame 7. The starting coil 8A is sleeved on the coil frame 7, and the holding coil 8B is sleeved on the starting coil 8A. The two first spring pieces 9 are symmetrically arranged on both sides of the second spring piece 10. One end of one first spring piece 9 is connected to one end of the holding coil 8B and the other end is connected to the moving-stable spring. One end of the other first spring piece 9 is connected to one end of the starting coil 8A and the other end is connected to the moving-moving spring. One end of the second spring piece 10 is connected to the other end of the starting coil 8A and the other end of the holding coil 8B. The wiring space 27 of the other end of the second spring piece 10 and the moving-stable spring is used for external connection.

[0049] like Figure 3 and Figure 11As shown, the first spring 9 in this embodiment includes a wiring portion 93, a connecting portion 91 for connecting with the auxiliary spring 2 (moving spring or moving-stationary spring), and a mounting portion 92 for fixing to the coil frame 7. The mounting portion 92 and the wiring portion 93 are arranged side by side. One end of the wiring portion 93 extends to connect with the side of the mounting portion 92, and the other end of the wiring portion 93 has an I-shaped structure for winding around the lead end of the starting coil 8A or holding coil 8B. The connecting portion 91 extends into the shielding shell 1 and is interference-fitted between the contact section 242 of the auxiliary spring 2 and the second sidewall 14 of the mounting cavity (i.e., within the receiving gap 26). The connecting portion 91 has a barbed structure with a hook portion 911. The side of the connecting portion 91 facing away from the hook portion 911 is a second contact surface 912. The second contact surface 912 is in contact with the first contact surface 242a of the contact section 242, and the hook portion 911 abuts against the second sidewall 14. The barbed connecting part 91 of the first spring 9 is interference-fitted with the receiving gap 26, and the contact pressure generated by the deformation of the hook part 911 realizes a reliable connection between the auxiliary spring 2 and the first spring 9.

[0050] like Figures 9-10 As shown, one end of the second spring 10 in this embodiment is an I-shaped structure, used to start the coil 8A or keep the lead of the coil 8B wound around. The other end of the second spring 10 includes two clamping pieces that are symmetrically arranged and spaced apart. There is a wiring gap between the two clamping pieces for external connection. The middle of the two clamping pieces are relatively close and the two ends are relatively far apart, so that the wiring gap first becomes narrower and then wider along the wiring direction (downward direction in the figure).

[0051] 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.

[0052] 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. An auxiliary contact structure, comprising a normally closed auxiliary contact (2A), a normally open auxiliary contact (2B), and an auxiliary push rod (6) mounted on a shielding shell (1), wherein the normally closed auxiliary contact (2A) comprises two auxiliary springs (2) serving as a moving parting spring and a moving parting stationary spring, respectively, and the normally open auxiliary contact (2B) comprises two auxiliary springs (2) serving as a moving closing spring and a moving closing stationary spring, respectively, wherein the auxiliary push rod (6) drives the moving parting spring and the moving closing spring to disconnect from the moving parting stationary spring, and simultaneously drives the moving closing spring and the moving closing stationary spring to close, wherein the shielding shell (1) is provided with a mounting cavity for mounting the auxiliary springs (2), wherein the auxiliary springs (2) comprise a contact portion (21) and a support portion (22), the contact portion (21) and the support portion (22) being connected in a straight line, characterized in that: The support (22) extends downward on the side away from the contact (21) to form a first clamping arm (24), and the support (22) extends downward on the other side near the contact (21) to form a second clamping arm (23). The second clamping arm (23) is inclined and close to the first clamping arm (24) in the downward direction. There is a wiring space (27) between the first clamping arm (24) and the second clamping arm (23). The mounting cavity has a first sidewall (13) and a second sidewall (14) opposite to each other. The first clamping arm (24) and the second clamping arm (23) are placed between the first sidewall (13) and the second sidewall (14). The first sidewall (13) is provided with a limiting surface (131). The first clamping arm (24) abuts against the second sidewall (14) and is opposite to the first sidewall (13). The end of the first clamping arm (24) is bent upward to form a bent arm (25). The bent arm (25) is inclined and close to the first sidewall (13) in the upward direction. The bent arm (25) abuts against the limiting surface (131).

2. The auxiliary contact structure according to claim 1, characterized in that: The second sidewall (14) is provided with a limiting protrusion (141), and the first clamping arm (24) is provided with a limiting hole (241a) that communicates with the wiring space (27). The limiting protrusion (141) is inserted into the limiting hole (241a).

3. The auxiliary contact structure according to claim 1, characterized in that: The first clamping arm (24) includes a fixed section (241) connected to the support (22) and a contact section (242) connected between the fixed section (241) and the bending arm (25). The fixed section (241) is attached to the second side wall (14). The contact section (242) and the second side wall (14) are spaced apart to form a receiving gap (26). The side of the contact section (242) facing the second side wall (14) is the first contact surface (242a).

4. The auxiliary contact structure according to claim 1, characterized in that: The first sidewall (13) is provided with a stop surface (132) opposite to the second clamping arm (23). The stop surface (132) is inclined and close to the second sidewall (14) in the downward direction.

5. The auxiliary contact structure according to claim 1, characterized in that: The mounting cavity has a guide rib (15) on its side wall, and the support part (22) has a guide groove (222) that slides with the guide rib (15) on its side.

6. The auxiliary contact structure according to claim 1, characterized in that: One end of the auxiliary push rod (6) extends outward to form an extension arm (61). The extension arm (61) is provided with a first driving part (62) for driving the moving split spring. The contact part (21) of the moving split spring is located above the contact part (21) of the moving split stationary spring and the first driving part (62). The other end of the auxiliary push rod (6) is provided with a notch (63). The notch (63) is provided with a second driving part (64) for driving the moving closing spring. The contact part (21) of the moving closing spring is located below the contact part (21) of the moving closing stationary spring and above the second driving part (64).

7. The auxiliary contact structure according to claim 6, characterized in that: The contact portions (21) of the moving split spring and the moving split stationary spring overlap to form a V-shape arrangement of the moving split spring and the moving split stationary spring; the contact portions (21) of the moving closing spring and the moving closing stationary spring overlap to form a V-shape arrangement of the moving closing spring and the moving closing stationary spring.

8. The auxiliary contact structure according to any one of claims 1-7, characterized in that: The mounting cavity includes a horizontal cavity (11) disposed on the top surface of the shielding shell (1) and a vertical cavity (12) that is L-shaped and communicates with the horizontal cavity (11) and extends downward through the shielding shell (1). The contact part (21) and the support part (22) are placed in the horizontal cavity (11). The first clamping arm (24) and the second clamping arm (23) are placed between the first side wall (13) and the second side wall (14) opposite to the vertical cavity (12). The top surface of the shielding shell (1) is provided with a mounting groove (17) that communicates with the horizontal cavity (11) and cooperates with the auxiliary push rod (6). The bottom wall of the mounting groove (17) is provided with a guide hole (18) that communicates with the shielding shell (1). The guide hole (18) is used to slide with the guide part (65) of the auxiliary push rod (6).

9. A contactor, comprising an electromagnetic system, a shielding housing (1), two stationary contacts (3) disposed within the shielding housing (1), a movable contact piece (4) for forming two moving contacts, and a guide rod (5) for driving the movable contact piece (4) to move up and down to open and close with the stationary contacts (3), characterized in that: It also includes the auxiliary contact structure as described in any one of claims 1-8, wherein the guide rod (5) drives the moving contact (4) to close with the stationary contact (3) and simultaneously drives the normally open auxiliary contact (2B) to close with the normally open stationary contact via the auxiliary push rod (6) of the auxiliary contact structure; the electromagnetic system includes a starting coil (8A) and a holding coil (8B) arranged in parallel, the starting coil (8A) and the normally closed auxiliary contact (2A) of the auxiliary contact structure are arranged in series, and the guide rod (5) drives the normally closed auxiliary contact (2A) to disconnect with the normally open stationary contact via the auxiliary push rod (6).

10. The contactor according to claim 9, characterized in that: The moving contact (4) is located in the middle of the shielding shell (1). The guide rod (5) passes through the moving contact (4) and is spaced apart from the auxiliary push rod (6) located above the moving contact (4). The two stationary contacts (3) are positioned above the two moving contacts at both ends of the moving contact (4). The normally open auxiliary contact (2B) and normally closed auxiliary contact (2A) are located on both sides of the moving contact (4).

11. The contactor according to claim 9, characterized in that: The electromagnetic system also includes a coil frame (7), two first springs (9) mounted on the coil frame (7) and a second spring (10). The starting coil (8A) is sleeved on the coil frame (7) and the holding coil (8B) is sleeved on the starting coil (8A). The two first springs (9) are symmetrically arranged on both sides of the second spring (10). One end of one first spring (9) is connected to one end of the holding coil (8B) and the other end is connected to the moving and stationary spring. One end of the other first spring (9) is connected to one end of the starting coil (8A) and the other end is connected to the moving and moving spring. One end of the second spring (10) is connected to the other end of the starting coil (8A) and the other end of the holding coil (8B). The other end of the second spring (10) and the wiring space (27) are respectively used for external connection.

12. The contactor according to claim 11, characterized in that: The first spring (9) includes a connecting part (91), which extends into the shielding shell (1) and is interlocked between the contact section (242) of the auxiliary spring (2) and the second side wall (14) of the mounting cavity.

13. The contactor according to claim 12, characterized in that: The connecting part (91) is a barb structure. The connecting part (91) has a hook (911). The side of the connecting part (91) facing away from the hook (911) is a second contact surface (912). The second contact surface (912) is in contact with the first contact surface (242a) of the contact segment (242). The hook (911) abuts against the second side wall (14).

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