Direct-current double-phase contactor

Abstract

The invention provides a direct-current double-phase contactor, and belongs to the technical field of contactors. The direct-current double-phase contactor comprises a base, a plurality of coil assemblies, a contact assembly, an arc extinguishing assembly and a reset assembly, the coil assemblies are arranged on the base at intervals, the contact plate with the movable contacts is installed on the rotating arm of each coil assembly, and the static contacts matched with the movable contacts are arranged on the base, so that each coil assembly can operate independently, on-off control over different circuits is achieved, the influence of unified control is avoided, and the reliability of the circuit breaker is improved. And meanwhile, the static contacts corresponding to the movable contacts at the same positions on the contact plates corresponding to the different coil assemblies are grouped and connected in series, so that different circuits can be connected into the same circuit through the corresponding coil assemblies, and the control of different branch circuits is realized. And when one coil assembly is damaged, the other coil assembly can be used for controlling, so that the structural adaptability and reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of contactors, in particular to a direct current dual-phase contactor. BACKGROUND

[0002] As a kind of on-off control element of large current circuit, contactor can control the on-off of large current circuit through small current control circuit, thereby improving control safety.

[0003] At present, the existing contactor on the market includes coil assembly, contact assembly, arc extinguishing assembly and reset assembly, the coil of coil assembly is electrically connected to small current control circuit, contact assembly includes static contact and moving contact, at this time, moving contact and static contact are electrically connected to large current circuit, and moving contact is installed on a movable plate which can cooperate with coil assembly, and under the condition of coil on-off, the attraction or separation of movable plate can be realized, in addition, reset assembly is also arranged between movable plate and coil assembly, which can ensure that movable plate can automatically reset after coil power off, so as to realize the contact and separation of moving contact and static contact, thereby meeting the use requirement of small current control circuit controlling large current circuit and improving the safety of circuit control. In addition, arc extinguishing assembly is also arranged in the area where moving contact and static contact are located, which can realize the arc extinction generated in the on-off process of moving contact and static contact, reduce the influence on the connected circuit, prevent the arc from damaging the contact and prolong the service life. Therefore, contactor is widely used in switching control scene of circuit with high control safety requirement. However, the existing contactor usually controls the action of multiple contact assemblies by one coil assembly, that is, multiple contact assemblies act synchronously when the coil assembly acts, the control is relatively single, and the collapse of the whole control circuit system will be caused in the case of coil assembly damage and failure, so the adaptability is poor. SUMMARY

[0004] In view of the above problems existing in the prior art, the present application provides a direct current dual-phase contactor, which is provided with a plurality of coil assemblies on the base, each coil assembly corresponds to an independent contact plate, and a plurality of contacts are arranged on each contact plate, thereby realizing the on-off control of a plurality of lines, so that each coil assembly can independently control a plurality of corresponding lines, the control is more diversified, and in addition, the static contacts at the same position in a plurality of contacts corresponding to different coil assemblies are grouped and connected in series, so that the on-off control of the same line can also be realized by different coil assemblies, and the adaptability is improved in the case of damage of one coil assembly.

[0005] The specific technical scheme is as follows: A direct current dual-phase contactor has the following characteristics, comprising: a base; Several coil assemblies are arranged on a base and spaced apart from each other. Each coil assembly includes a coil base, an electromagnetic coil and a rotating arm. The coil base is fixed on the base, the electromagnetic coil is installed on the coil base, and the rotating arm is deflected and installed on the coil base and cooperates with the electromagnetic coil. Contact assembly: Each coil assembly corresponds to a contact assembly. Each contact assembly includes a contact plate, a stationary contact, and a moving contact. The contact plate is mounted on the rotating arm of the corresponding coil assembly, the moving contact is mounted on the contact plate, and the stationary contact is mounted on the base. The arc extinguishing assembly has one corresponding arc extinguishing assembly for each contact plate. The arc extinguishing assembly includes a mounting frame, an arc extinguishing chamber, and a permanent magnet. The mounting frame is mounted on the base, and the arc extinguishing chamber is detached and mounted on the mounting frame. The arc extinguishing chamber has an arc extinguishing cavity. One end of the contact plate with the moving contact extends to the opening of the arc extinguishing cavity or into the arc extinguishing cavity. A permanent magnet is installed inside the arc extinguishing cavity and on the side of the arc extinguishing cavity. The arc extinguishing chamber is covered by a protective shell. A reset assembly is located between the rotating arm and the electromagnetic coil.

[0006] The aforementioned DC two-phase contactor further includes an auxiliary switch. Each coil assembly corresponds to an auxiliary switch, each auxiliary switch has a normally closed circuit, and the corresponding electromagnetic coil is electrically connected to the normally closed circuit.

[0007] In the aforementioned DC two-phase contactor, each auxiliary switch has two telescopic contacts, and the two telescopic contacts are connected to a normally open circuit. After the two telescopic contacts retract, the normally open circuit closes and conducts electricity. The end of the rotating arm away from the connecting contact plate extends to the two telescopic contacts of the corresponding auxiliary switch.

[0008] In the aforementioned DC two-phase contactor, a common terminal is provided on the base, and the electromagnetic coil is connected to the normally closed circuit of the corresponding auxiliary switch and the common terminal.

[0009] In the aforementioned DC two-phase contactor, a number of rectifier bridges are also provided on the base, and each coil assembly corresponds to one rectifier bridge, with the electromagnetic coil selectively connected to the corresponding rectifier bridge.

[0010] In the aforementioned DC two-phase contactor, the number of moving contacts on the same contact plate is set to a certain number, and the moving contacts are arranged at intervals on the contact plate. The base is provided with a certain number of stationary contacts that cooperate with each moving contact.

[0011] In the aforementioned DC two-phase contactor, the stationary contacts corresponding to the moving contacts at the same position on different contact plates are connected to the same conductive plate.

[0012] The aforementioned DC two-phase contactor includes an auxiliary opening mounting plate on the coil base, an auxiliary switch mounted on the corresponding auxiliary opening mounting plate, a U-shaped notch on the auxiliary opening mounting plate, a middle part of the rotating arm located within the U-shaped notch, an extending limiting block located within the U-shaped notch and above the rotating arm, and a clamping member, the middle part of the clamping member pressing against the rotating arm, and both ends of the clamping member abutting against the limiting block.

[0013] The aforementioned DC two-phase contactor further includes an overtravel protection component. The overtravel protection component includes a mounting rod, an adapting spring, and a pin. One end of the mounting rod is fixed to the rotating arm and extends toward the side away from the electromagnetic coil. A through hole is opened in the middle of the contact plate and is sleeved on the mounting rod. The other end of the mounting rod is sleeved with an adapting spring. At the same time, a pin is provided on the mounting rod on the side of the adapting spring away from the contact plate. The two ends of the adapting spring abut against the contact plate and the pin, respectively.

[0014] In the aforementioned DC two-phase contactor, each mounting bracket includes two clamps, a plurality of limit seats are provided on the base, each coil assembly has a corresponding limit seat, the stationary contact is mounted on the limit seat, the two clamps of the mounting bracket are respectively provided on both sides of the limit seat, and the two clamps are bent toward the opposite side to form an anti-disengagement part, and the bottom of each arc-extinguishing chamber has clamping grooves on both sides, and the anti-disengagement parts of the two clamps are inserted into the two clamping grooves of the corresponding arc-extinguishing chamber.

[0015] The positive effects of the above technical solution are: The aforementioned DC two-phase contactor, by having several independently arranged coil assemblies spaced at intervals on the base, and each coil assembly having a contact plate with several moving contacts mounted on its rotating arm, along with stationary contacts on the base that cooperate with the moving contacts, and each coil assembly having a corresponding arc-extinguishing component located at the corresponding moving and stationary contacts, allows for the independent operation of each coil assembly to control the corresponding contact assembly, thus achieving control of multiple circuits and providing greater control versatility. Furthermore, the stationary contacts located in the same position are grouped and connected in series, allowing different circuits to be connected to the same circuit through different coil assemblies, ensuring that different coil assemblies can also achieve on / off control of the same circuit. Even if one coil assembly fails, control can still be achieved through another coil assembly, resulting in better adaptability and higher reliability. Attached Figure Description

[0016] Figure 1 This is a structural diagram from one perspective of an embodiment of a DC two-phase contactor according to the present invention; Figure 2 This is a structural diagram from another perspective of an embodiment of a DC two-phase contactor of the present invention; Figure 3This is a structural diagram of a DC two-phase contactor after the arc-extinguishing assembly has been removed, according to the present invention. Figure 4 This is a schematic diagram showing the installation of the reset assembly, clamping component, and overtravel protection assembly of a DC two-phase contactor according to the present invention.

[0017] In the attached diagram: 1. Base; 11. Common terminal; 12. Rectifier bridge; 13. Limiting seat; 2. Coil assembly; 21. Coil holder; 22. Electromagnetic coil; 23. Rotating arm; 24. Auxiliary mounting plate; 231. Positioning groove; 241. U-shaped notch; 242. Limiting block; 3. Contact assembly; 31. Contact plate; 32. Stationary contact; 33. Moving contact; 34. Conductive plate; 4. Arc extinguishing assembly; 41. Mounting bracket; 42. Arc extinguishing chamber; 421. Arc extinguishing cavity; 422. Protective shell; 423. Clamping groove; 5. Reset assembly; 6. Auxiliary switch; 61. Telescopic contact; 7. Clamping component; 8. Overtravel protection assembly; 81. Mounting rod; 82. Adaptive spring; 83. Pin. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 4 The technical solutions provided by this invention are described in detail, but the following content is not intended to limit this invention.

[0019] Figure 1 This is a structural diagram from one perspective of an embodiment of a DC two-phase contactor according to the present invention; Figure 2 This is a structural diagram from another perspective of an embodiment of a DC two-phase contactor of the present invention; Figure 3 This is a structural diagram of a DC two-phase contactor after the arc-extinguishing assembly has been removed, according to the present invention. Figure 1 , Figure 2 as well as Figure 3 As shown, the DC two-phase contactor provided in this embodiment includes: a base 1, several coil assemblies 2, contact assemblies 3, arc extinguishing assemblies 4, and a reset assembly 5. Each coil assembly 2 corresponds to the contact assembly 3, the arc extinguishing assembly 4, and the reset assembly 5, ensuring that each control channel can operate independently and meet the usage requirements of diverse control circuits.

[0020] Specifically, base 1 is used to support the overall structure and also provides the conditions for the contactor to be installed on other bases in the future.

[0021] Specifically, several coil assemblies 2 are arranged on the base 1 at intervals, allowing multiple independently arranged coil assemblies 2 on the same contactor. This provides the conditions for the independent operation of each coil assembly 2 to achieve different circuit controls. Each coil assembly 2 includes a coil base 21, an electromagnetic coil 22, and a rotating arm 23. During installation, the coil base 21 is fixed to the base 1, achieving stable installation of the coil assembly 2 on the base 1. Simultaneously, the electromagnetic coil 22 is installed on the coil base 21, containing an iron core. The rotating arm 23 is deflected and installed on the coil base 21, cooperating with the electromagnetic coil 22. When the electromagnetic coil 22 is energized or de-energized, it can attract or release the rotating arm 23, allowing it to deflect on the coil base 21, providing conditions for subsequent contact contact or separation. Furthermore, each coil assembly 2 can operate independently, achieving control of multiple circuits and meeting diverse control needs. It also provides the condition for continued circuit control even if one coil assembly 2 fails.

[0022] Specifically, each coil assembly 2 corresponds to a contact assembly 3. Each contact assembly 3 includes a contact plate 31, a stationary contact 32, and a moving contact 33. The contact plate 31 is mounted on the rotating arm 23 of the corresponding coil assembly 2, so that the rotating arm 23 can synchronously drive the contact plate 31 to deflect when it deflects, providing conditions for the subsequent contact or separation of the stationary contact 32 and the moving contact 33. At this time, the moving contact 33 is mounted on the contact plate 31, so that the moving contact 33 can move with the contact plate 31, while the stationary contact 32 is mounted on the base 1, so that the moving contact 33 can move relative to the stationary contact 32. Thus, when the rotating arm 23 deflects, the moving contact 33 and the corresponding stationary contact 32 can be contacted or separated, meeting the usage requirements of the control circuit.

[0023] Specifically, each contact plate 31 corresponds to an arc-extinguishing assembly 4, and the arc-extinguishing assembly 4 includes a mounting frame 41, an arc-extinguishing chamber 42, and a permanent magnet. The mounting frame 41 is mounted on the base 1, and the arc-extinguishing chamber 42 is detached and mounted on the mounting frame 41, achieving stable installation of the arc-extinguishing chamber 42 on the base 1. At the same time, it also makes the arc-extinguishing chamber 42 detachable, providing convenience for subsequent maintenance, repair, and replacement. In addition, the arc-extinguishing chamber 42 has an arc-extinguishing cavity 421. One end of the contact plate 31 with the moving contact 33 extends to the opening of the arc-extinguishing cavity 421 or into the arc-extinguishing cavity 421. Similarly, the stationary contact 32 corresponding to the moving contact 33 is also arranged at the opening of the arc-extinguishing cavity 421 or into the arc-extinguishing cavity 421, so that the arc generated when the moving contact 33 and the stationary contact 32 move relative to each other can be introduced into the arc-extinguishing chamber 42 for arc extinguishing operation. In addition, a permanent magnet is installed inside the arc-extinguishing chamber 42 and on the side of the arc-extinguishing cavity 421. The arc is ignited by the permanent magnet, which improves the arc-extinguishing effect. Furthermore, a protective shell 422 covers the arc-extinguishing chamber 42. Preferably, the protective shell 422 is made of metal. The protective shell 422 can not only protect the outside of the arc-extinguishing chamber 42, but also provide better heat dissipation performance, resulting in a more reasonable structural design.

[0024] Specifically, the reset component 5 is disposed between the rotating arm 23 and the electromagnetic coil 22. Preferably, the reset component 5 is a spring, so that after the electromagnetic coil 22 is energized and attracts the rotating arm 23, if the electromagnetic coil 22 is de-energized, the rotating arm 23 will move in the opposite direction under the action of the reset component 5 to achieve the reset of the rotating arm 23, thereby realizing the contact or separation of the relevant contacts.

[0025] More specifically, each coil assembly 2 also has a corresponding auxiliary switch 6, providing the condition for each coil assembly 2 to be independently controlled subsequently. At this time, each auxiliary switch 6 has a normally closed circuit, and the corresponding electromagnetic coil 22 is electrically connected to the normally closed circuit, so that the external control circuit can control the corresponding electromagnetic coil 22 through the auxiliary switch 6, thereby meeting the usage requirements for independently controlling the operation of the coil assembly 2.

[0026] More specifically, each auxiliary switch 6 has two telescopic contacts 61, and these two contacts 61 are connected to a normally open circuit. When the two telescopic contacts 61 retract, the normally open circuit closes and conducts, enabling the auxiliary switch 6 to also function as a control circuit. This provides the conditions for subsequent integration into the feedback circuit to achieve control status feedback. At this time, the end of the rotating arm 23 away from the connecting contact plate 31 extends to the two telescopic contacts 61 of the corresponding auxiliary switch 6. This allows the end of the rotating arm 23 to simultaneously act on the two telescopic contacts 61 of the corresponding auxiliary switch 6 when the arm deflects, thus pressing down on the two telescopic contacts 61. This allows the energization and de-energization of the coil assembly 2 to synchronously control the feedback circuit of the corresponding auxiliary switch 6, further increasing the diversity of the control circuit. It is worth noting that since the auxiliary switch 6 with two telescopic contacts 61 and internal circuitry is a commercially available product, it can be purchased and used directly according to usage requirements; therefore, its specific structure will not be described in detail here.

[0027] More specifically, a common terminal 11 is also provided on the base 1 for connecting to an external control circuit, providing conditions for the external control circuit to control the on / off state of the corresponding coil. At this time, connecting the electromagnetic coil 22 to the normally closed circuit of the corresponding auxiliary switch 6 and the common terminal 11 achieves the purpose of connecting the electromagnetic coil 22 to the external control circuit.

[0028] More specifically, several rectifier bridges 12 are also provided on the base 1, and one coil assembly 2 corresponds to one rectifier bridge 12. The electromagnetic coil 22 is selectively connected to the corresponding rectifier bridge 12. That is, when the external control circuit is AC, it can be connected to the rectifier bridge 12 and then connected to the corresponding electromagnetic coil 22 through the rectifier bridge 12, thereby adapting to AC scenarios. Combined with the above-mentioned common terminal 11, it can directly adapt to DC scenarios. When different parts are selected for connection, it can adapt to both DC and AC occasions, realizing AC and DC universal compatibility.

[0029] More specifically, the number of moving contacts 33 on the same contact plate 31 is set to a certain number, and the moving contacts 33 are arranged at intervals on the contact plate 31, so that the contact plate 31 can realize the synchronous movement of multiple moving contacts 33 at the same time when it is activated. Correspondingly, the base 1 is provided with a certain number of stationary contacts 32 that cooperate with each moving contact 33, so that each moving contact 33 and its corresponding stationary contact 32 can realize the control of one line, thereby realizing the simultaneous control of multiple lines. This allows the same coil assembly 2 to control multiple lines at the same time, meeting diverse control needs.

[0030] More specifically, the stationary contacts 32 corresponding to the moving contacts 33 at the same position on different contact plates 31 are connected to the same conductive plate 34. That is, the stationary contacts 32 at the same position are electrically connected together through the conductive plate 34. When the conductive plate 34 is connected to the circuit, different coil assemblies 2 can realize the on / off control of the circuit. At this time, since different contact plates 31 are connected to different circuits, the contactor can meet the control requirements of multiple circuits and better meet the diversified control requirements.

[0031] Figure 4 This is a schematic diagram illustrating the installation of the reset assembly, clamping member, and overtravel protection assembly of a DC two-phase contactor according to the present invention. Figure 1 As shown in Figure 4, an auxiliary mounting plate 24 is also provided on the coil base 1 of the coil assembly 2, and the auxiliary switch 6 is installed on the corresponding auxiliary mounting plate 24, realizing the stable installation of the auxiliary switch 6 next to the corresponding coil assembly 2. Furthermore, a U-shaped notch 241 is provided on the auxiliary mounting plate 24, and the middle part of the rotating arm 23 is located within the U-shaped notch 241, providing space for the installation and deflection of the rotating arm 23. Simultaneously, an extending limiting block 242 is provided within the U-shaped notch 241 and above the rotating arm 23. Preferably, the limiting block 242 is formed by bending the inner wall of the U-shaped notch 241 to one side, realizing the integrated arrangement of the limiting block 242 and the auxiliary mounting plate, resulting in higher structural strength. In addition, a clamping member 7 is included. The middle part of the clamping member 7 presses against the rotating arm 23, and both ends of the clamping member 7 abut against the limiting block 242. The clamping member 7 restricts the middle part of the rotating arm 23 within the U-shaped notch 241 on the auxiliary mounting plate 24, which not only prevents the rotating arm 23 from falling off the auxiliary mounting plate 24, but also accommodates the deflection movement of the rotating arm 23, making the structural design more reasonable. Preferably, the clamping member 7 is a U-shaped elastic steel wire, which gives the clamping member 7 a certain degree of elasticity, making installation convenient and better accommodating the deflection of the rotating arm 23. In addition, a positioning groove 231 is provided in the middle of the rotating arm 23, and the middle part of the clamping member 7 presses against the positioning groove 231, preventing the clamping member 7 from shifting position after installation on the rotating arm 23, which would lead to installation failure. The structural design is more reasonable.

[0032] More specifically, an overtravel protection component 8 is also provided between the rotating arm 23 and the contact plate 31. The overtravel protection component 8 includes a mounting rod 81, an adaptation spring 82, and a pin 83. One end of the mounting rod 81 is fixed to the rotating arm 23 and extends toward the side away from the electromagnetic coil 22. A through hole is opened in the middle of the contact plate 31 and it is sleeved on the mounting rod 81, so that the contact plate 31 can be restricted by the mounting rod 81, which provides the conditions for the contact plate 31 to be restricted to the rotating arm 23 by the mounting rod 81. In addition, an adaptation spring 82 is sleeved on the other end of the mounting rod 81. At the same time, a pin 83 is provided on the mounting rod 81 on the side of the adaptation spring 82 away from the contact plate 31. The two ends of the adaptation spring 82 are respectively abutted against the contact plate 31 and the pin 83, realizing the elastic connection between the contact plate 31 and the rotating arm 23. When the rotating arm 23 moves towards the electromagnetic coil 22 and drives the contact plate 31 to move towards the electromagnetic coil 22, if the deflection force of the rotating arm 23 is too large, it can be adapted by compressing the adaptation spring 82 to prevent the contact plate 31 from bending or breaking. It also prevents the contact assembly 3 from being crushed, thus improving safety.

[0033] More specifically, each mounting bracket 41 used to install the arc-extinguishing chamber 42 includes two clamping pieces. The base 1 is provided with several limiting seats 13, and each coil assembly 2 corresponds to one limiting seat 13. The stationary contact 32 of the contact assembly 3 is installed on the limiting seat 13. The limiting seat 13 is made of insulating material, which provides both support for the contact assembly 3 and electrical isolation. Furthermore, the two clamping pieces of the mounting bracket 41 are respectively located on both sides of the limiting seat 13, and the two clamping pieces are bent towards the opposite side to form an anti-detachment part. Each arc-extinguishing chamber 42 has clamping grooves 423 on both sides of its bottom. The anti-detachment parts of the two clamping pieces are inserted into the corresponding clamping grooves 423 of the arc-extinguishing chamber 42, enabling the arc-extinguishing chamber 42 to be disassembled and connected on the limiting seat 13, making disassembly and assembly more convenient.

[0034] The DC two-phase contactor provided in this embodiment includes a base 1, several coil assemblies 2, contact assemblies 3, arc extinguishing assemblies 4, and a reset assembly 5. By arranging several coil assemblies 2 at intervals on the base 1, and installing a contact plate 31 with several moving contacts 33 on the rotating arm 23 of each coil assembly 2, and setting stationary contacts 32 on the base 1 to cooperate with the moving contacts 33, each coil assembly 2 can operate independently, thus realizing the on / off control of different lines without being affected by unified control, achieving diversified control. At the same time, the stationary contacts 32 corresponding to the moving contacts 33 at the same position on the contact plate 31 of different coil assemblies 2 are grouped and connected in series, so that different lines can be connected to the same line through the corresponding coil assembly 2 to realize the control of different branch lines. When one coil assembly 2 is damaged, it can be controlled by another coil assembly 2, improving the structural adaptability and reliability.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A direct current double-phase contactor, characterized by, It includes: a base; a plurality of coil assemblies, each of which is arranged on the base and spaced apart from each other, each of which includes a coil seat, an electromagnetic coil and a rotating arm, the coil seat is fixed on the base, the electromagnetic coil is installed on the coil seat, and the rotating arm is installed on the coil seat and cooperates with the electromagnetic coil; a contact assembly, each of which corresponds to a contact assembly, each of which includes a contact plate, a static contact and a dynamic contact, the contact plate is installed on the rotating arm of the corresponding coil assembly, the dynamic contact is installed on the contact plate, and the static contact is installed on the base; an arc extinguishing assembly, each of which corresponds to an arc extinguishing assembly, and the arc extinguishing assembly includes a mounting frame, an arc extinguishing chamber and a permanent magnet, the mounting frame is installed on the base, the arc extinguishing chamber is detachably installed on the mounting frame, the arc extinguishing chamber has an arc extinguishing cavity, one end of the contact plate with the dynamic contact extends to the cavity of the arc extinguishing cavity or inside the arc extinguishing cavity, and the permanent magnet is arranged in the arc extinguishing chamber and located on the side of the arc extinguishing chamber, and the arc extinguishing chamber is covered with a protective shell; a reset assembly arranged between the rotating arm and the electromagnetic coil.

2. The direct current dual-phase contactor of claim 1, wherein, It also includes an auxiliary switch, each of which corresponds to an auxiliary switch, each of which has a normally closed circuit, and the corresponding electromagnetic coil is electrically connected with the normally closed circuit.

3. The DC bipolar contactor according to claim 2, characterized in that Each of the auxiliary switches has two telescopic contacts, and the two telescopic contacts are connected with a normally open circuit, and the normally open circuit is closed and conducted after the two telescopic contacts are retracted.

4. The DC bipolar contactor according to claim 3, characterized in that The end of the rotating arm away from the contact plate extends to the two telescopic contacts of the corresponding auxiliary switch.

5. The DC bipolar contactor according to claim 4, characterized in that The base is also provided with a common wiring terminal, and the electromagnetic coil is connected with the normally closed circuit of the corresponding auxiliary switch and the common wiring terminal.

6. The direct current dual-phase contactor of claim 1, wherein, The base is also provided with a plurality of rectifier bridges, and each coil assembly corresponds to a rectifier bridge, and the electromagnetic coil is selectively connected to the corresponding rectifier bridge.

7. The direct current dual-phase contactor of claim 6, wherein, The number of dynamic contacts on the same contact plate is set to several, and the several dynamic contacts are arranged on the same contact plate, and the base is provided with a plurality of static contacts matched with each dynamic contact.

8. The DC bipolar contactor of claim 2, wherein, The static contacts corresponding to the dynamic contacts at the same position on different contact plates are connected on the same conductive plate. The coil base is also provided with an auxiliary opening installation plate, the auxiliary switch is installed on the corresponding auxiliary opening installation plate, the auxiliary opening installation plate is provided with a U-shaped notch, the middle part of the rotating arm is arranged in the U-shaped notch, the U-shaped notch is provided with an extending limiting block above the rotating arm, and a pressing piece is also included, the middle part of the pressing piece is pressed on the rotating arm, and the two ends of the pressing piece are abutted on the limiting block.

9. The direct current dual-phase contactor of claim 1, wherein, The over-travel protection assembly comprises a mounting rod, an accommodating spring and a latch, one end of the mounting rod is fixed to the rotating arm and extends towards a side away from the electromagnetic coil, a middle part of the contact plate is provided with a through hole and is sleeved on the mounting rod, the other end of the mounting rod is sleeved with the accommodating spring, and the mounting rod is provided with the latch on a side of the accommodating spring away from the contact plate.

10. The direct current dual-phase contactor of claim 1, wherein, Each of the mounting frames comprises two clamping pieces, the base is provided with a plurality of limiting seats, each of the coil assemblies corresponds to one of the limiting seats, the stationary contact is mounted on the limiting seat, the two clamping pieces of the mounting frame are respectively arranged on the two sides of the limiting seat, and the opposite sides of the two clamping pieces are bent to form anti-disengagement parts, the two sides of the bottom of each arc-extinguishing chamber are provided with clamping grooves, and the anti-disengagement parts of the two clamping pieces are clamped into the clamping grooves of the corresponding arc-extinguishing chambers.

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