Direct current contactor with contact plate rotation restrained

Abstract

The utility model discloses a DC contactor can restrain the rotation of contact piece, including contact piece, magnetic pole board and be used for driving contact piece to make axial movement's push rod subassembly, the limit support of fixed limit on magnetic pole board is established, and limit support is equipped with restraint space, and push rod subassembly is provided with the deflection baffle of preventing, and the one end of deflection baffle stretches into restraint space, and limit support is cooperated with the deflection baffle of preventing, is used for the restraint push rod subassembly and contact piece can only be rotated in the allowable range. The utility model through fixed limit support with restraint space on magnetic pole board, and let the deflection baffle of preventing on push rod subassembly one end stretches into restraint space cooperation, can effectively restrain push rod subassembly and contact piece only rotate in the allowable range, both reduce the friction debris to maintain the clean surface of contact piece, guarantee the conductivity performance stability of contactor, can also avoid the situation that contact piece appears with static contact point alignment deviation because of the unexpected rotation, and the reliability of on-off is improved.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and in particular to a DC contactor that can constrain the rotation of contact pieces. Background Technology

[0002] DC contactors, as core power components for controlling the switching on and off of DC circuits, are widely used in new energy vehicles, energy storage systems, industrial automation control, and other fields. Their reliability directly affects the stable operation of the entire power system. Existing DC contactors typically include contact plates, stationary contacts, push rod assemblies, and a drive mechanism. The core function of the push rod assembly is to drive the contact plates axially under the driving force of the drive mechanism, thereby achieving contact or separation between the contact plates and the corresponding stationary contacts, thus completing the circuit switching control.

[0003] However, current DC contactors generally suffer from the following technical defects in actual operation: due to the limitations of the driving force transmission path or structural design of the drive mechanism, when the push rod assembly drives the contact piece to move axially, it is prone to unexpected rotation around its own central axis (such as clockwise or counterclockwise rotation). The abnormal offset of the push rod assembly will indirectly cause the contact piece to rotate unexpectedly, which will destroy the alignment accuracy between the contact piece and the stationary contact, resulting in a reduction in the contact area and uneven contact pressure, further reducing the reliability of switching. Especially under high voltage and high current conditions, it is easy to cause safety hazards such as arc erosion.

[0004] To address this, existing DC contactors typically incorporate limiting ribs within a shielding enclosure above the magnetic pole plate to constrain the rotation of the contact pieces. However, over long-term use, the contact pieces experience direct friction with the limiting ribs of the shielding enclosure. The resulting debris gradually adheres to the contact piece surface, increasing contact resistance and significantly reducing conductivity. In severe cases, this can even lead to poor contact, localized overheating, and other malfunctions, shortening the contactor's lifespan. Therefore, it is necessary to improve the existing technology to overcome these shortcomings. Utility Model Content

[0005] The problem to be solved by this utility model is to provide a DC contactor that can constrain the rotation of the contact piece, so as to overcome the defect of existing DC contactors that are prone to generating debris adhering to the surface of the contact piece, resulting in a shortened life.

[0006] The technical solution adopted by the present utility model to solve its technical problem is: A DC contactor capable of restricting rotation of a contact piece, comprising a contact piece, a pole plate, and a push rod assembly configured to drive the contact piece to move axially, wherein a limit bracket is fixed on the pole plate, the limit bracket is provided with a restriction space, the push rod assembly is provided with an anti-deflection guide plate, one end of the anti-deflection guide plate extends into the restriction space, and the limit bracket cooperates with the anti-deflection guide plate to restrict the push rod assembly and the contact piece from rotating only within an allowable range.

[0007] As a further improvement of the present utility model, the limit bracket is in a "几" shape, which comprises an inverted U-shaped limit part and fixing parts formed by horizontally bending two ends of the limit part outwards, the restriction space is formed in the limit part, and the fixing parts are used for fixedly connecting with the pole plate.

[0008] As a further improvement of the present utility model, the limit part has two opposite blocking walls distributed along the vertical direction, and the blocking walls are used for stopping the anti-deflection guide plate when the push rod assembly rotates clockwise or counterclockwise around its own central axis.

[0009] As a further improvement of the present utility model, mounting holes are respectively formed on the two fixing parts, the pole plate is provided with protruding columns which are in one-to-one correspondence with the mounting holes and have the same quantity as the mounting holes, and the protruding columns are fitted into the mounting holes and fixed by riveting.

[0010] As a further improvement of the present utility model, the two fixing parts are fixedly welded to the pole plate.

[0011] As a further improvement of the present utility model, the push rod assembly comprises an insulating block injection-molded from a plastic material, and the anti-deflection guide plate is integrally formed with the insulating block by means of insert injection molding.

[0012] As a further improvement of the present utility model, the anti-deflection guide plate comprises a plastic-coated part and two guide plate parts integrally connected to two sides of the plastic-coated part, the insulating block covers the plastic-coated part, and both the two guide plate parts protrude out of the insulating block; two of the limit brackets are fixed on the pole plate, and the two guide plate parts extend into the respective restriction spaces of the two limit brackets in one-to-one correspondence.

[0013] As a further improvement of this utility model, the push rod assembly further includes an upper bracket, a lower bracket, a spring, and a push rod. The middle part of the lower bracket and the upper end of the push rod are integrally formed with the insulating block by insert injection molding, and both ends of the lower bracket protrude from the insulating block. The upper bracket is U-shaped, and its two ends are fixedly snapped onto the two ends of the lower bracket. The contact piece passes through the upper bracket, and the spring is disposed between the contact piece and the insulating block. The lower end of the push rod passes through the magnetic pole plate and is fixedly connected to the drive mechanism of the DC contactor. The limiting bracket, the lower bracket, and the push rod are all mutually insulated.

[0014] As a further improvement of this utility model, a gap is left between the anti-deviation guide plate and the two baffles. When the anti-deviation guide plate is in the middle position between the two baffles, the distance between the anti-deviation guide plate and the baffles is 0.1 to 0.5 times the width of the anti-deviation guide plate.

[0015] As a further improvement of this utility model, both the limiting bracket and the anti-deviation guide plate are made of metal.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a DC contactor that can constrain the rotation of the contact piece. By fixing a limiting bracket with a constraint space on the magnetic pole plate and allowing one end of the anti-deviation guide plate on the push rod assembly to extend into the constraint space, the push rod assembly and the contact piece can be effectively constrained to rotate only within the allowable range. This effectively solves the problem of powder accumulation on the contact piece due to friction between the push rod assembly and the shielding shell, which reduces the conductivity of traditional DC contactors. It reduces friction loss to maintain the cleanliness of the contact piece surface and ensures the stability of the contactor's conductivity. It also avoids misalignment between the contact piece and the stationary contact due to unexpected rotation, improving the reliability of circuit switching and extending the mechanical life of the overall DC contactor structure. Furthermore, by designing the limiting bracket in a Z-shape, this utility model provides a precise constraint path for the push rod assembly and the contact piece and achieves low-resistance sliding contact, greatly reducing frictional resistance and energy loss during movement and improving the driving efficiency of the drive mechanism. At the same time, this design has more relaxed requirements for the precision of component processing and overall assembly, enabling automated assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a perspective view of the DC contactor of the present invention, which can constrain the rotation of the contact pieces; Figure 2 This is an exploded view of the contact piece, anti-deviation guide plate, and push rod assembly in the DC contactor that can constrain the rotation of the contact piece according to this utility model. Figure 3 This is an exploded view of the magnetic pole plate and limiting bracket in the DC contactor that can constrain the rotation of the contact piece according to this utility model. Figure 4 This is a right view of the limiting bracket and anti-deviation guide plate in the DC contactor that can constrain the rotation of the contact piece according to this utility model.

[0019] Referring to the accompanying drawings, the following explanations are provided: 1. Contact piece; 2. Magnetic pole plate; 201. Protruding post; 3. Limiting bracket; 301. Constraint space; 302. Limiting part; 3021. Baffle; 303. Fixing part; 3031. Mounting hole; 4. Anti-deviation guide plate; 401. Plastic coating part; 402. Guide plate part; 5. Insulating block; 6. Upper bracket; 7. Lower bracket; 8. Spring; 9. Push rod; 10. Moving iron core. Detailed Implementation

[0020] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0025] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0026] See Figures 1 to 4 This utility model provides a DC contactor that can constrain the rotation of a contact piece, including a contact piece 1, a magnetic pole plate 2, and a push rod assembly for driving the contact piece 1 to move axially. The contact piece 1 is mounted on the push rod assembly, which is connected to the drive mechanism of the DC contactor. Under the driving force of the drive mechanism, the push rod assembly can drive the contact piece 1 to move axially, thereby achieving contact or separation between the contact piece 1 and the stationary contact of the DC contactor, and thus completing the on / off control.

[0027] It is understood that the "axial direction" mentioned in this article specifically refers to the direction of the central axis of the push rod 9 in the push rod assembly.

[0028] As one of the important improvements of this utility model, a limiting bracket 3 is fixed on the top surface of the magnetic pole plate 2, and the limiting bracket 3 is provided with a constraint space 301. The push rod assembly is provided with an anti-deviation guide plate 4, and one end of the anti-deviation guide plate 4 extends into the constraint space 301. The limiting bracket 3 cooperates with the anti-deviation guide plate 4 to constrain the push rod assembly and the contact piece 1 to rotate only within the allowable range, and will not interfere with the axial movement of the push rod assembly. This invention, by fixing a limiting bracket 3 with a constraint space 301 on the magnetic pole plate 2 and having one end of the anti-deviation guide plate 4 on the push rod assembly extend into the constraint space 301, can effectively constrain the push rod assembly and contact piece 1 to rotate only within the allowable range. This effectively solves the problem of powder accumulation on the contact piece 1 due to friction between the push rod assembly and the shielding shell, which reduces the conductivity of traditional DC contactors. It reduces friction loss to maintain the cleanliness of the contact piece 1 surface, ensuring stable conductivity of the contactor, and also avoids misalignment between the contact piece 1 and the stationary contact due to unexpected rotation. This improves the reliability of circuit switching and extends the mechanical life of the overall structure of the DC contactor.

[0029] It should be noted that the expression "the limiting bracket 3 cooperates with the deviation-preventing guide plate 4 to restrict the push rod assembly and the contact piece 1 to rotate only within the allowable range" described herein means that this structure allows the push rod assembly and the contact piece 1 to rotate within a small range, and after rotation, it can still ensure that the contact piece 1 and the static contact have a large contact area and uniform contact pressure, so that the reliability of on-off control can also be ensured within this rotation range.

[0030] With reference to Figure 3 and Figure 4 , the limiting bracket 3 is in a shape of a Chinese character "ji", which includes an inverted U-shaped limiting portion 302 and fixing portions 303 formed by horizontally bending two ends of the limiting portion 302 outward in opposite directions. A restriction space 301 is formed inside the limiting portion 302, and the fixing portions 303 are used for fixedly connecting with the pole plate 2. In the utility model, the limiting bracket 3 is designed into the shape of the Chinese character "ji", the inverted U-shaped limiting portion 302 can form a stable and closed restriction space 301, providing a reliable limiting boundary for the deviation-preventing guide plate 4, and avoiding the problem that the deviation-preventing guide plate 4 is prone to derailment due to unstable restriction of the guide structure; while the horizontally bent fixing portions 303 increase the contact area with the pole plate 2, which facilitates the stable connection between the limiting bracket 3 and the pole plate 2.

[0031] Wherein, the limiting portion 302 has two opposite blocking walls 3021 distributed along the vertical direction. The blocking walls 3021 are used to stop the deviation-preventing guide plate 4 when the push rod assembly rotates clockwise or counterclockwise around its own central axis, so as to provide an accurate restriction path for the push rod assembly and the contact piece 1, and realize low-resistance sliding fit, which greatly reduces the frictional resistance and energy loss during the moving process, improves the driving efficiency of the driving mechanism. Meanwhile, this design has looser precision requirements for component processing and complete machine assembly, and can realize automatic assembly.

[0032] As shown in Figure 3 , in this embodiment, mounting holes 3031 are provided on both of the two fixing portions 303 of the limiting bracket 3, and the pole plate 2 is provided with protruding columns 201 which are in one-to-one correspondence with the mounting holes 3031 and have the same quantity, and the protruding columns 201 are fitted into the mounting holes 3031 and fixed by riveting.

[0033] In this utility model, the limiting bracket 3 can be integrally stamped from sheet metal. By adopting a structural design in which the protruding post 201 is fitted into the mounting hole 3031 and riveted, the limiting bracket 3 and the magnetic pole plate 2 can be quickly pre-positioned, avoiding the alignment deviation problem that occurs in the traditional assembly process, improving assembly efficiency, and meeting the needs of automated mass production, thereby improving production efficiency and helping to control manufacturing costs. At the same time, the riveting method can form a tight and non-removable connection, avoiding structural loosening caused by vibration during long-term use, ensuring that the limiting bracket 3 always maintains a fixed posture during the operation of the DC contactor, and continuously and stably constrains the push rod assembly and contact piece 1.

[0034] Of course, in some other embodiments of this utility model, the two fixing parts 303 of the limiting bracket 3 can also be fixed to the magnetic pole plate 2 by welding.

[0035] Furthermore, the push rod assembly includes an insulating block 5 injection molded from plastic material, which is positioned above the magnetic pole plate 2, and when the DC contactor is in the disconnected state, the insulating block 5 stops against the top surface of the magnetic pole plate 2.

[0036] Among them, the anti-deflection guide plate 4 can also be integrally stamped from sheet metal. The anti-deflection guide plate 4 and the insulating block 5 are integrally formed by insert injection molding. This molding method can make the anti-deflection guide plate 4 and the insulating block 5 form an inseparable whole, reducing loosening and abnormal noise during the operation of the push rod assembly and improving structural stability. At the same time, the plastic insulating block 5 can effectively isolate the anti-deflection guide plate 4 from other metal parts of the push rod assembly, ensuring the insulation between high and low voltage and improving the safety of DC contactor use. In addition, the integral molding also eliminates the process of assembling the anti-deflection guide plate 4 and the insulating block 5 separately, simplifying the assembly process and further reducing costs.

[0037] See Figure 2 The anti-deviation guide plate 4 is a plate-shaped plate distributed in the horizontal direction. It includes a plastic coating part 401 located in the middle and two guide plate parts 402 integrally connected to both sides of the plastic coating part 401. The width of the plastic coating part 401 is greater than that of the guide plate parts 402 on both sides. The plastic coating part 401 is provided with a clearance hole in the middle for the push rod 9 to pass through. The insulating block 5 is covered on the plastic coating part 401, and the insulating block 5 protrudes outward from both guide plate parts 402.

[0038] Preferably, two limiting brackets 3 are fixed on the magnetic pole plate 2, and the two guide plate parts 402 extend one-to-one into the constraint space 301 of the two limiting brackets 3 respectively. This symmetrical cooperation structure can make the push rod assembly bear the force evenly, avoid the offset and tilting problem caused by the force on one side, ensure that the push rod assembly moves smoothly along the axial direction, improve the guiding accuracy, and the plastic covering part 401 of the insulating block 5 increases the bonding area between the anti-deviation guide plate 4 and the insulating block 5, making the connection between the two more firm.

[0039] See Figure 4 A gap is left between the anti-deviation guide plate 4 and the two baffles 3021. When the anti-deviation guide plate 4 is in the middle position between the two baffles 3021, the distance between the anti-deviation guide plate 4 and the baffles 3021 is 0.1 to 0.5 times the width of the anti-deviation guide plate 4. This gap design can accommodate small errors in the operation of the push rod assembly, avoid the axial movement jamming problem caused by direct rigid contact between the anti-deviation guide plate 4 and the baffles 3021, achieve low-resistance sliding fit, greatly reduce frictional resistance and energy loss during movement, and ensure that the push rod assembly can smoothly drive the contact piece to complete the on and off action. At the same time, the gap of 0.1 to 0.5 times the width can strictly limit the rotation range of the anti-deviation guide plate 4, avoid constraint failure and push rod over-range rotation caused by excessive gap, and take into account the flexibility of the push rod assembly movement and the effectiveness of rotation constraint, ensuring the stable operation of the drive device.

[0040] In this invention, both the limiting bracket 3 and the anti-deviation guide plate 4 are made of metal, such as stainless steel. Metal materials have far greater hardness and wear resistance than traditional plastic guide components, can withstand the impact and friction of the push rod assembly during long-term operation, and are not prone to wear and debris generation, thus ensuring the stable operation of the push rod assembly and contact piece 1, thereby improving the overall service life of the DC contactor.

[0041] like Figure 1 and Figure 2 As shown, the push rod assembly also includes an upper bracket 6, a lower bracket 7, a spring 8, and a push rod 9. The middle part of the lower bracket 7 and the upper end of the push rod 9 are integrally formed with the insulating block 5 by insert injection molding, and the limiting bracket 3, the lower bracket 7, and the push rod 9 are all mutually insulated. Both ends of the lower bracket 7 protrude outward from the insulating block 5. In this embodiment, the extension directions of the two ends of the lower bracket 7 are perpendicular to the extension directions of the two ends of the anti-deflection guide plate 4.

[0042] Furthermore, the upper bracket 6 is U-shaped with its opening facing downwards, and its two ends are respectively fixedly snapped onto the two ends of the lower bracket 7 to form a fixed assembly. The contact piece 1 is transversely inserted into the upper bracket 6, and the spring 8 is disposed between the contact piece 1 and the insulating block 5 to apply an upward elastic force to the contact piece 1, so that the contact piece 1 is pressed against the inner top wall of the upper bracket 6.

[0043] Furthermore, the lower end of the push rod 9 passes through the magnetic pole plate 2 and is fixedly connected to the drive mechanism of the DC contactor.

[0044] The driving mechanism is a conventional technology, including a coil, a moving iron core 10 and a magnetic circuit. The coil and magnetic circuit are not shown in the figure. The moving iron core 10 is fixed to the lower end of the push rod 9. The coil is fitted on the outside of the moving iron core 10. The magnetic circuit (including the magnetic pole plate 2) is used to enhance the magnetic attraction force on the moving iron core 10 when the coil is energized.

[0045] In addition, the DC contactor that can constrain the rotation of the contact piece also includes a shield and two stationary contacts fixed on the shield. The lower ends of the two stationary contacts extend into the interior of the shield and are distributed vertically opposite to the contact piece 1.

[0046] When the coil is energized, the moving iron core 10 is magnetized and moves upward under the action of magnetic attraction, attracting it to the magnetic pole plate 2 (or the stationary iron core). At the same time, the moving iron core 10 pushes the contact piece 1 upward through the push rod assembly, abutting against the two stationary contacts, thus achieving connection. When the coil is de-energized, the magnetic attraction of the moving iron core 10 disappears. Under the elastic force of the spring 8 and the iron core spring, the moving iron core 10 drives the contact piece 1 downward through the push rod assembly to reset, causing the contact piece 1 to disconnect from the two stationary contacts.

[0047] During the aforementioned upward and downward movements, the limit bracket 3, in conjunction with the anti-deviation guide plate 4, effectively constrains the push rod assembly and contact piece 1 to rotate only within the allowable range. This prevents the contact piece 1 from deviating from the stationary contact due to unexpected rotation, thereby improving the reliability of circuit switching and extending the mechanical life of the overall DC contactor structure.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A DC contactor capable of constraining the rotation of a contact piece, comprising a contact piece (1), a magnetic pole plate (2), and a push rod assembly for driving the contact piece (1) to move axially, characterized in that, A limit bracket (3) is fixed on the pole plate (2), the limit bracket (3) is provided with a restraining space (301), the push rod assembly is provided with an anti-deviation guide plate (4), one end of the anti-deviation guide plate (4) extends into the restraining space (301), and the limit bracket (3) cooperates with the anti-deviation guide plate (4) to restrict the push rod assembly and the contact piece (1) to rotate only within an allowable range.

2. The DC contactor capable of constraining the rotation of contact pieces according to claim 1, characterized in that, The limit bracket (3) is in a shape of a Chinese character "几", which comprises an inverted U-shaped limit portion (302) and fixing portions (303) formed by horizontally bending two ends of the limit portion (302) outwards, the restraining space (301) is formed in the limit portion (302), and the fixing portions (303) are used for being fixedly connected with the pole plate (2).

3. The DC contactor capable of constraining the rotation of contact pieces according to claim 2, characterized in that, The limit portion (302) has two opposite blocking walls (3021) distributed along the vertical direction, and the blocking walls (3021) are used for stopping the anti-deviation guide plate (4) when the push rod assembly rotates clockwise or counterclockwise around its own central axis.

4. The DC contactor capable of constraining the rotation of contact pieces according to claim 2, characterized in that, Mounting holes (3031) are formed in both of the two fixing portions (303), convex columns (201) which are in one-to-one correspondence with the mounting holes (3031) and have the same quantity as the mounting holes (3031) are arranged on the pole plate (2), and the convex columns (201) are fitted into the mounting holes (3031) and fixed by riveting.

5. The DC contactor capable of constraining the rotation of contact pieces according to claim 2, characterized in that, The two fixing portions (303) are fixedly welded to the pole plate (2).

6. The DC contactor capable of constraining the rotation of contact pieces according to claim 1, characterized in that, The push rod assembly comprises an insulating block (5) formed by injection molding of a plastic material, and the anti-deviation guide plate (4) and the insulating block (5) are integrally formed in an insert injection molding mode.

7. The DC contactor capable of constraining the rotation of contact pieces according to claim 6, characterized in that, The anti-deviation guide plate (4) comprises a plastic-coated portion (401) and two guide plate portions (402) integrally connected to two sides of the plastic-coated portion (401), the insulating block (5) coats the plastic-coated portion (401), and both the two guide plate portions (402) protrude out of the insulating block (5); two said limit brackets (3) are fixed on the pole plate (2), and the two guide plate portions (402) correspondingly extend into the respective restraining spaces (301) of the two limit brackets (3) in one-to-one correspondence.

8. The DC contactor capable of constraining the rotation of contact pieces according to claim 7, characterized in that, The push rod assembly further comprises an upper bracket (6), a lower bracket (7), a spring (8) and a push rod (9), the middle part of the lower bracket (7) and the upper end of the push rod (9) are both integrally formed with the insulating block (5) in an insert injection molding mode, and both ends of the lower bracket (7) protrude out of the insulating block (5); the upper bracket (6) is U-shaped, two ends of the upper bracket are fixedly clamped at two ends of the lower bracket (7), the contact piece (1) penetrates through the upper bracket (6), and the spring (8) is arranged between the contact piece (1) and the insulating block (5); the lower end of the push rod (9) penetrates through the pole plate (2) and is fixedly connected with the driving mechanism of the DC contactor; wherein the limit bracket (3), the lower bracket (7) and the push rod (9) are insulated from each other.

9. The DC contactor capable of constraining the rotation of contact pieces according to claim 3, characterized in that, There is a gap between the anti-deviation guide plate (4) and the two baffles (3021). When the anti-deviation guide plate (4) is in the middle position of the two baffles (3021), the distance between the anti-deviation guide plate (4) and the baffles (3021) is 0.1 to 0.5 times the width of the anti-deviation guide plate (4).

10. The DC contactor capable of constraining the rotation of contact pieces according to claim 1, characterized in that, Both the limiting bracket (3) and the anti-deviation guide plate (4) are made of metal.

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