Base and pushing card connecting structure of relay and electromagnetic relay

Abstract

The utility model discloses a base and push card connection structure of a relay and an electromagnetic relay, the connection structure comprises a base and a push card, the base comprises a bottom plate and two enclosure walls protruding upwards from the edge of the bottom plate, and the two enclosure walls are arranged oppositely; the pushing card is arranged in the base from top to bottom and is positioned between the two enclosure walls; at least one surrounding wall is provided with a guide limiting piece, and the guide limiting piece conducts upper limiting on the pushing card and provides guide for movement of the pushing card. According to the utility model, the pushing card can be arranged in the base adopting the enclosure frame type structure from top to bottom, an opening is not required to be arranged on the bottom plate of the base for mounting the pushing card, and a side mounting mode is also not required to be adopted for mounting the pushing card, so that a cover plate part is not required to be added, the glue leakage risk can be reduced, and the base part is small in deformation, stable in size and structure, and convenient to assemble and disassemble. And the stability of product performance parameters can be ensured. The guide limiting piece is used for providing upper limiting and movement guiding for the pushing card, and it can be guaranteed that the pushing card moves smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a relay base and a push card connection structure and an electromagnetic relay. Background Art

[0002] In applications such as power systems, short-circuit failures are unavoidable. If the relay does not have the ability to withstand short-circuit currents, once a short circuit occurs, the fault range of the entire circuit will expand, affecting the stability and reliability of the system. Good short-circuit current resistance helps ensure that the relay operates stably and is not interfered with in a complex electromagnetic environment. At present, the anti-short-circuit structure of the contact part of the relay is designed to connect the movable spring piece to one end of the movable spring lead-out piece, and the other end of the movable spring piece and the movable spring lead-out piece are in the same direction, that is, the movable spring piece and the movable spring lead-out piece are arranged side by side. When one end of the movable spring lead-out piece partially penetrates the base from top to bottom, the exposed part serves as a terminal connected to the external circuit. At this time, the free end of the movable spring piece is at the bottom of the base, and the push card, as a linkage part, is usually also placed at the bottom of the base, which is more conducive to the action of the movable spring piece. When the base is a frame structure, the existing technology usually sets an opening on the bottom plate of the base, and the push card is installed into the base from the opening of the bottom plate. After the push card is assembled, the opening is sealed by the cover part. The problem with this solution is that the base has an irregular shape, injection molding is difficult, and the parts have large warping and deformation, which will cause the cover to be unable to fit tightly with the base. The sliding groove formed by the base and the cover has poor dimensional accuracy, which will cause the push block to move unsmoothly. At the same time, due to the poor fit between the cover and the base, glue can easily flow into the interior of the relay, gluing the push card to the base, causing the relay to fail to operate.

[0003] The existing technology also uses a side-insertion structure for the movable spring. This structure means that the base has no front side plate. This structure requires the movable spring to be pre-assembled with the push card, magnetic circuit, and armature before being installed into the base. The rear side plate of the base has a slide groove to accommodate the push card. Since there is no front side plate, a cover plate is required. The slide groove formed by the cover plate and the base accommodates the push card. Due to the poor fit of the cover plate, the height of the slide grooves on the front and back sides of the base that accommodate the push card is difficult to align, which also affects the movement of the push card. Utility Model Content

[0004] The utility model addresses the technical problems existing in the prior art and provides a connection structure between a relay base and a push card and an electromagnetic relay. Through structural improvement, the push card can be installed from top to bottom into a base with a frame structure without providing an opening on the bottom plate of the base, while ensuring that the push card moves stably and smoothly.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a base and push card connection structure of a relay, including a base and a push card, the base including a bottom plate and two surrounding walls protruding upward from the edges of the bottom plate, the two surrounding walls being arranged opposite to each other; the push card is installed in the base from top to bottom and is located between the two surrounding walls; at least one surrounding wall is installed with a guide limiter, the guide limiter upper-limits the push card and provides guidance for the movement of the push card.

[0006] Furthermore, the bottom of the surrounding wall on which the guide limiter is installed is respectively provided with installation grooves passing through its inner and outer wall surfaces, the guide limiter is inserted into the installation groove from the outside of the surrounding wall, and the guide limiter partially passes through the installation groove and protrudes from the inner wall surface of the surrounding wall.

[0007] Furthermore, the guide limiter includes a horizontal guide plate and a mounting block arranged at the bottom end of the guide plate, so that the guide limiter is T-shaped; the shape of the mounting groove is adapted to the shape of the guide limiter; the guide plate partially passes through the mounting groove and protrudes from the inner wall surface of the surrounding wall.

[0008] Furthermore, the guide limit member is provided with a limit protrusion at one end facing the outer side of the surrounding wall, and the inner wall surface of the installation groove is provided with a limit step corresponding to the limit protrusion. The limit protrusion cooperates with the limit step to limit the depth of the guide limit member installed in the installation groove.

[0009] Furthermore, the guide limiter is interference fit with the mounting groove.

[0010] Furthermore, a guide boss is provided on the upper surface of the base plate, and the guide boss provides support and movement guidance for the push card.

[0011] Furthermore, the guide bosses are respectively provided at the positions where the upper surface of the base plate meets the two surrounding walls. The guide bosses are in the shape of long strips and extend along the movement direction of the push card. The guide limiter and the guide bosses on the same side cooperate with each other to form the guide groove of the push card.

[0012] Furthermore, the two surrounding walls are respectively equipped with the guide limiters.

[0013] The present invention further provides an electromagnetic relay, comprising the base and push-card connection structure of the relay as described above in the present invention.

[0014] Furthermore, it also includes a dynamic spring part, which includes a dynamic spring lead-out piece and a dynamic spring piece that can be elastically deformed. The upper end of the dynamic spring piece is fixedly connected to the upper end of the dynamic spring lead-out piece, and the dynamic contact is arranged on the dynamic spring piece and faces away from the dynamic spring lead-out piece; the lower end of the dynamic spring piece is clamped in the corresponding card slot of the push card, and the lower end of the dynamic spring lead-out piece passes through the corresponding make-shift slot of the push card and is inserted into the corresponding slot of the base.

[0015] Furthermore, it also includes an armature part, which is rotatably connected between the two surrounding walls using a rotating shaft, and the bottom of the armature part is inserted into the connecting groove corresponding to the push card.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Because the push card is installed from top to bottom into the base and is located between the two surrounding walls, at least one of the surrounding walls is equipped with a guide limiter. This guide limiter provides an upper limit for the push card and provides guidance for the movement of the push card. This allows the push card of the present invention to be installed from top to bottom into the base with a frame structure, eliminating the need for an opening on the bottom plate of the base to install the push card and eliminating the need for side-mounting the push card. Therefore, there is no need for additional cover parts, which can reduce the risk of glue leakage. Furthermore, the base parts have minimal deformation, and the size and structure are stable, which can better ensure the stability of product performance parameters. Furthermore, the present invention uses a guide limiter to provide an upper limit and movement guide for the push card. The fixed position and size of the guide limiter ensure smooth movement of the push card, reduce the degree of twisting during the push card's operation, ensure that the contact point between the push card and the movable spring remains essentially unchanged, and the movable spring's reaction force is consistent, thereby improving the consistency of the relay's operation time. At the same time, due to the consistent pressure on the contacts, the relay's electrical life and reliability are higher.

[0018] 2. Because the two surrounding walls are each provided with a mounting slot extending through their inner and outer surfaces, the guide stopper is inserted into the mounting slot from the outer side of the surrounding wall. The guide stopper partially extends through the mounting slot and protrudes from the inner surface of the surrounding wall. This facilitates installation of the guide stopper of the present invention and reduces the internal space occupied by the base. In particular, the interference fit between the guide stopper and the mounting slot further enhances the stability of the guide stopper's position, thereby further improving its guiding effect on the push card.

[0019] 3. The guide and position-limiting member preferably includes the guide plate and the mounting block, which can satisfy the guiding and position-limiting functions of the guide and position-limiting member while improving the installation reliability of the guide and position-limiting member.

[0020] 4. A guide boss is further provided on the upper surface of the bottom plate, which can reduce the contact area between the push card and the upper surface of the bottom plate, thereby reducing the sliding friction of the push card and further improving the smoothness of the push card movement.

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments; however, the base and push-card connection structure of a relay and the electromagnetic relay of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the base of the utility model;

[0023] Figure 2 It is a cross-sectional view of the base of the utility model;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the guide and limiting member of the utility model;

[0025] Figure 4 This is a front view of the guide limiter of the utility model;

[0026] Figure 5 This is a top view of the guide limiter of the present utility model;

[0027] Figure 6 It is a side view of the guide limiter of the utility model;

[0028] Figure 7 This is a schematic diagram of the three-dimensional structure of the base and the guide limiter of the utility model in the assembled state;

[0029] Figure 8 This is a cross-sectional view of the base and the guide limiter of the utility model in the assembled state;

[0030] Figure 9 This is a schematic diagram of the three-dimensional structure of the push card of the utility model Figure 1 ;

[0031] Figure 10 This is a top view of the push card of the utility model;

[0032] Figure 11 This is a schematic diagram of the three-dimensional structure of the push card of the utility model Figure 2 ;

[0033] Figure 12 It is a cross-sectional view of the push card of the utility model;

[0034] Figure 13 This is a schematic diagram of the three-dimensional structure of the dynamic spring part of the utility model;

[0035] Figure 14It is a three-dimensional structural diagram of the movable spring part and the push card in the combined state of the utility model;

[0036] Figure 15 This is a cross-sectional view of the movable spring portion and the push card of the utility model in the assembled state;

[0037] Figure 16 This is a schematic diagram of the three-dimensional structure of the push card, base and guide limiter of the utility model in the assembled state;

[0038] Figure 17 This is a cross-sectional view of the push card, base, and guide limiter of the utility model in an assembled state;

[0039] Figure 18 This is a schematic diagram of the three-dimensional structure of the electromagnetic relay of the present invention (excluding the housing);

[0040] Figure 19 It is a cross-sectional view of the electromagnetic relay of the present utility model (excluding the housing);

[0041] In the figure, 1. the movable spring part, 11. the movable spring lead-out piece, 111. the support platform, 112. the notch, 12. the movable spring piece, 121. the sub-spring piece, 122. the U-shaped bend, 123. the hook, 13. the movable contact, 2. the push card, 21. the card slot, 211. the limit slot, 22. the clearance slot, 221. the protrusion, 23. the connecting slot, 3. the base, 31. the bottom plate, 311. the guide boss, 312. the slot, 32 , surrounding wall, 321, mounting groove, 33, guide slide, 4, armature part, 41, driving body, 42, armature, 43, permanent magnet, 5, rotating shaft, 6, winding unit, 61, coil frame, 62, enameled wire, 63, iron core, 64, yoke, 7, static spring part, 71, static spring sheet, 72, static contact, 8, guide limiter, 81, guide plate, 82, mounting block, 811 / 821, limiting protrusion. DETAILED DESCRIPTION

[0042] In the description of this utility model, the use of terms such as "upper," "lower," "left," and "right" to indicate directions or positional relationships is based on the directions or positional relationships shown in the accompanying drawings and is intended solely to facilitate the description of this utility model. They are not intended to indicate or imply that the device referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the scope of protection of this utility model. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, unless otherwise specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0044] See Figures 1-17 As shown, the base and push card connection structure of a relay of the present invention includes a base 3 and a push card 2. The base 3 includes a bottom plate 31 and two surrounding walls 32 protruding upward from the edges of the bottom plate 31, and the two surrounding walls 32 are arranged opposite to each other. The push card 2 is installed into the base 3 from top to bottom and is located between the two surrounding walls 32; at least one surrounding wall 32 is installed with a guide limiter 8, which upper-limits the push card 2 and provides guidance for the movement of the push card 2. Specifically, in this embodiment, the two surrounding walls 32 are respectively installed with guide limiters 8, but this is not limited to this. The movement of the push card 2 refers to the movement of the push card 2 when the relay is in normal working condition.

[0045] As a preferred method, the bottom of the two surrounding walls 32 of the base 3 are respectively provided with installation grooves 321 that pass through the inner and outer wall surfaces thereof. The guide limit member 8 is inserted into the installation groove 321 from the outer side of the surrounding wall 32, and the guide limit member 8 partially passes through the installation groove 321 and protrudes from the inner wall surface of the surrounding wall 32 to provide an upper limit and movement guide for the push card 2.

[0046] In this embodiment, if Figure 3-Figure 6 As shown, the guide limiter 8 includes a horizontal guide plate 81 and a mounting block 82 provided at the bottom end of the guide plate 81, so that the guide limiter 8 is T-shaped in the front view and rear view. The shape of the mounting groove 321 on each surrounding wall 32 is adapted to the shape of the guide limiter 8. In this way, while satisfying the guiding and limiting functions of the guide limiter 8, it is also beneficial to improve the installation reliability of the guide limiter 8. In particular, the guide limiter 8 and the mounting groove 321 are in an interference fit, which can further improve the fixation and reliability of the position of the guide limiter 8 after installation. After the guide limiter 8 is installed in the mounting groove 321, the guide plate 81 partially passes through the mounting groove 321 and protrudes from the inner wall surface of the surrounding wall 32, as shown in FIG. Figure 8 As shown, the upper limit and movement guidance of the push card 2 are achieved.

[0047] The guide limiter 8 is provided with a limit convex portion at one end facing the outer side of the surrounding wall 32. Figure 3 、 Figure 5 、 Figure 6 As shown, the guide plate 81 of the guide limit member 8 is provided with limiting protrusions 811 on the left and right sides of one end facing the outside of the surrounding wall 32, and the bottom of the end of the mounting block 82 facing the outside of the surrounding wall 32 is provided with a limiting protrusion 821, and the inner wall surface of the mounting groove 321 is provided with limiting steps (not shown in the figure) corresponding to each limiting protrusion. Each limiting protrusion cooperates with the corresponding limiting step to limit the depth of the guide limit member 8 inserted into the mounting groove 321, thereby further improving the installation reliability of the guide limit member 8.

[0048] like Figure 1 、 Figure 2 As shown, the upper surface of the base plate 31 is provided with a guide boss 311, which provides support and movement guidance for the push card 2. Specifically, the guide boss 311 is provided at the position where the upper surface of the base plate 31 meets the two surrounding walls 32. The guide boss 311 is long and extends along the movement direction of the push card 2. The guide limiter 8 on the same side cooperates with the guide boss 311 to form a guide slot 33 for the push card 2, as shown in FIG. Figure 8 shown.

[0049] The present invention provides a base and push card connection structure for a relay. Before installing the push card 2, the push card 2 and the dynamic spring part of the relay are first assembled into an assembly, and then the assembly is installed into the base 3 from top to bottom. However, the present invention is not limited to this. In other embodiments, the push card 2 is installed into the base 3 from top to bottom alone.

[0050] In this embodiment, if Figures 9-12 As shown, the push card 2 is provided with a card slot 21, a clearance slot 22 and a connecting slot 23 for connecting the armature part of the relay from left to right. The clearance slot 22 is located between the card slot 21 and the connecting slot 23. The card slot 21, the clearance slot 22 and the connecting slot 23 are respectively through-slot structures that are through-through and closed on all sides.

[0051] like Figure 13 As shown, the movable spring portion 1 includes a movable spring piece 12, a movable spring lead-out piece 11 and a movable contact 13. The upper end of the movable spring piece 12 is fixedly connected to the upper end of the movable spring lead-out piece 11 by riveting. The movable contact 13 is provided on the movable spring piece 12 and faces away from the movable spring lead-out piece 11. Specifically, the movable contact 13 is riveted roughly in the middle position of the movable spring piece 12. The movable spring piece 12 includes a plurality of sub-spring pieces 121, which are stacked together, and the upper end of each sub-spring piece 121 is respectively provided with a U-shaped bend 122 protruding toward the side away from the movable spring lead-out piece 11.

[0052] The lower end of the movable spring 12 is engaged with the retaining groove 21, limiting the position of the push card 2. The lower end of the movable spring lead-out piece 11 passes downward through the clearance groove 22. A support and retaining structure is provided between the movable spring lead-out piece 11 and the push card 2 to prevent the push card 2 from separating from the movable spring lead-out piece 11. Therefore, the movable spring portion 1 and the push card 2 form a stable assembly structure after assembly.

[0053] In this embodiment, the support and limiting structure comprises a support platform 111 provided on the dynamic spring lead-out piece 11 and a protrusion 221 provided on the wall of the clearance slot 22, with the protrusion 221 resting on the support platform 111. This makes the support and limiting structure relatively simple, and the present invention eliminates the need for additional components, helping to reduce costs and simplify the assembly process. In other embodiments, the support and limiting structure is a limiting member that fits over the dynamic spring lead-out piece and is located below the push card, thereby supporting the push card.

[0054] There are two support platforms 111, located on either side of the dynamic spring lead-out piece 11 in the width direction. There are also two protrusions 221, each located on the side of the clearance slot 22 away from the latch slot 21. The two protrusions 221 mate with the two support platforms 111. Specifically, the dynamic spring lead-out piece 11 has notches 112 on either side of the width direction. The lower walls of the two notches 112 constitute the two support platforms 111, and the upper walls of the two notches 112 are located above the push card 2. The notches 112 are preferably square notches that accommodate the push card 2, which can move within the notches 112.

[0055] In this embodiment, after the movable spring 12 is connected to the movable spring lead-out piece 11, the movable spring 12 tilts toward the side away from the movable spring lead-out piece 11. Before the movable spring portion 1 connects to the push card 2, the horizontal distance A between the lower end of the movable spring 12 and the opposite outer side of the lower end of the movable spring lead-out piece 11 is greater than the horizontal distance B between the side of the slot 21 away from the clearance slot 22 and the protrusion 221. The lower end of the movable spring 12 is engaged with the slot 21 while the movable spring 12 is deformed toward the movable spring lead-out piece 11. The movable spring 12 elastically recovers toward the side away from the movable spring lead-out piece 11, thereby driving the push card 2 to move, causing the protrusion 221 to move above the support platform 111, thereby achieving the support function of the support platform 111 for the protrusion 221. Therefore, the utility model realizes a special cooperation mode between the dynamic spring piece 12 and the push card 2, ensuring that the lower end of the dynamic spring lead-out piece 11 can freely pass through the clearance groove 22 of the push card 2, and at the same time utilizes the elastic effect of the dynamic spring piece 12 itself to realize that the dynamic spring lead-out piece 11 provides stable support for the push card 2, so that the structure of the push card 2 and the dynamic spring part 1 is more stable after being assembled into an assembly.

[0056] In this embodiment, a retaining groove 211 is provided on the side of the retaining groove 21 facing away from the clearance groove 22. A retaining protrusion is provided at the lower end of the movable spring 12, corresponding to the retaining groove 211. This retaining protrusion engages within the retaining groove 211. Specifically, the lower end of the movable spring 12's multiple sub-springs, the one furthest from the movable spring lead-out piece, is at least partially bent upward from the side facing away from the movable spring lead-out piece 11 to form a hook 123. This hook 123 constitutes the retaining protrusion. The retaining groove 211 is a blind groove structure with an opening at the lower end, allowing the hook 123 to more easily enter the retaining groove 211.

[0057] After the push card 2 and the spring assembly 1 are assembled into the base 3 from top to bottom, the push card 2 rests on the guide bosses 311 on either side of the base 3, and the lower end of the spring lead-out piece 11 is inserted into the corresponding slot 312 on the base 3. Next, the two guide stoppers 8 are installed in the mounting grooves 321 of the two surrounding walls 32, respectively, so that the two guide stoppers 8 provide upper positioning and guide movement for the push card 2.

[0058] Therefore, the present invention allows the push card 2 to be installed from top to bottom into the base 3 with a frame structure, and eliminates the need to provide an opening on the bottom plate 31 of the base 3 to install the push card 2. It also eliminates the need to install the push card 2 in a side-mounted manner, thereby eliminating the need for additional cover parts, reducing the risk of glue leakage, and minimizing deformation of the base parts. The size and structure are stable, which can better ensure the stability of product performance parameters. In addition, the present invention uses a guide limiter 8 to provide an upper limit and motion guide for the push card 2. The position and size of the guide limiter 8 are fixed, which can ensure smooth movement of the push card 2, reduce the degree of twisting during the movement of the push card 2, ensure that the contact point between the push card 2 and the movable spring is basically unchanged, and the reaction force of the movable spring is consistent, thereby improving the consistency of the relay action time. At the same time, due to the consistent pressure on the contacts, the electrical life and reliability of the relay are higher.

[0059] Please attend Figures 1-19 As shown, an electromagnetic relay of the present invention includes the base and push card connection structure of the relay of the present invention as described above.

[0060] The present invention further comprises a dynamic spring part 1 , the structure of which is as described above and will not be described again here.

[0061] The present invention also includes an armature portion 4, which is rotatably connected between the two surrounding walls 32 of the base 3 via a rotating shaft 5. The bottom of the armature portion 4 is inserted into the corresponding connecting groove 23 of the push card 2. The armature portion 4 specifically comprises an insulated driving body 41 and an armature assembly mounted within the driving body 41. The armature assembly is I-shaped, with its four ends extending outside the driving body 41. The driving body 41 is rotatably connected to the surrounding frame 31 of the base 3 via a rotating shaft 5, and the bottom end of the driving body 41 is connected to the push card 2. The armature assembly specifically consists of two parallel armature pieces 42 and a permanent magnet 43 sandwiched between the two armature pieces 41. The present invention also includes a winding unit 6, which includes a coil frame 61, an enameled wire 62 wound around the coil frame 61, two yokes 64 and an iron core 63. The iron core 63 is inserted into the through hole of the coil frame. The two yokes 64 are L-shaped, and one side of the two yokes 64 is riveted to the two ends of the iron core 63. The other side of one yoke 64 is fitted between the upper ends of the two armatures 42, and the other side of the other yoke 64 is fitted between the lower ends of the two armatures 42. Figure 16 Therefore, the present invention constitutes a magnetic latching relay, but is not limited thereto.

[0062] The present invention also includes a static spring portion 7, which comprises a static spring piece 71 inserted into the base 3 and a static contact 72 disposed on the static spring piece 71. The static contact 72 engages with the dynamic contact 13 on the dynamic spring portion 1. When the present invention is closed, the static spring portion 7 pushes against the dynamic spring piece 12, causing it to deform toward the dynamic spring lead-out piece 11. Therefore, the size of the aforementioned protrusion 221 is designed to be small, so that after the dynamic spring portion 1 is assembled with the push card 2, the dynamic spring lead-out piece 11 substantially contacts the side of the clearance slot 22 where the protrusion 221 is located. In other embodiments, by increasing the size of the protrusion 221 in the direction of movement of the push card 2, an appropriate spacing can be achieved between the dynamic spring lead-out piece 11 and the side of the clearance slot 22 where the protrusion 221 is located after the dynamic spring portion 1 is assembled with the push card 2, allowing for the push card 2 to drive the dynamic spring piece 12 away from the dynamic spring lead-out piece 11.

[0063] The present invention further comprises a shell (not shown in the figure), the bottom end of which is connected to the base 3 and contains the static spring part 7, the dynamic spring part 1, the push card 2, the armature part 4, the winding unit 6 and the like in its shell cavity.

[0064] The utility model provides a relay base and push card connection structure and an electromagnetic relay, and the unrelated parts are the same as those in the prior art or can be implemented by using the prior art.

[0065] The above embodiments are only used to further illustrate a base and push-card connection structure of a relay and an electromagnetic relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the scope of protection of the technical solution of the present invention.

Claims

1. A relay base and push card connection structure, comprising a base and a push card, wherein the base comprises a bottom plate and two surrounding walls extending upward from the edges of the bottom plate, the two surrounding walls being arranged opposite each other; characterized in that: The push card is installed into the base from top to bottom and is located between the two surrounding walls; at least one surrounding wall is installed with a guide limiter, which limits the position of the push card and provides guidance for the movement of the push card.

2. The relay base and push-card connection structure according to claim 1, characterized in that: The bottom of the surrounding wall on which the guide limiter is installed is provided with an installation groove running through the inner and outer wall surfaces thereof. The guide limiter is inserted into the installation groove from the outer side of the surrounding wall, and the guide limiter partially passes through the installation groove and protrudes from the inner wall surface of the surrounding wall.

3. The relay base and push-card connection structure according to claim 2, characterized in that: The guide limiter includes a horizontal guide plate and a mounting block arranged at the bottom end of the guide plate, so that the guide limiter is T-shaped; the shape of the mounting groove is adapted to the shape of the guide limiter; the guide plate partially passes through the mounting groove and protrudes from the inner wall surface of the surrounding wall.

4. The relay base and push-card connection structure according to claim 2, characterized in that: The guide limit piece is provided with a limit protrusion at one end facing the outer side of the surrounding wall, and the inner wall surface of the installation groove is provided with a limit step corresponding to the limit protrusion. The limit protrusion cooperates with the limit step to limit the depth of the guide limit piece installed in the installation groove.

5. The relay base and push card connection structure according to claim 2, characterized in that: The guide limiting member is interference fit with the installation groove.

6. The base and push card connection structure of a relay according to any one of claims 1 to 5, characterized in that: A guide boss is provided on the upper surface of the base plate, and the guide boss provides support and movement guidance for the push card.

7. The relay base and push-card connection structure according to claim 6, characterized in that: The guide bosses are respectively provided at the positions where the upper surface of the base plate meets the two surrounding walls. The guide bosses are long strips and extend along the movement direction of the push card. The guide limiter and the guide bosses on the same side cooperate with each other to form the guide slots of the push card.

8. The relay base and push-card connection structure according to claim 1, characterized in that: The two surrounding walls are respectively equipped with the guide limiting parts.

9. An electromagnetic relay, characterized in that: The invention comprises a base and a push card connection structure of a relay according to any one of claims 1 to 8.

10. The electromagnetic relay according to claim 9, wherein: The movable spring also includes a movable spring portion, which includes a movable spring lead-out piece and an elastically deformable movable spring piece. The upper end of the movable spring piece is fixedly connected to the upper end of the movable spring lead-out piece. The movable contact is provided on the movable spring piece and faces away from the movable spring lead-out piece. The lower end of the movable spring piece is clamped in a corresponding clamping slot of the push card. The lower end of the movable spring lead-out piece passes through a corresponding clearance slot of the push card and is inserted into a corresponding slot of the base. It also includes an armature part, which is rotatably connected between the two surrounding walls using a rotating shaft, and the bottom of the armature part is inserted into a connecting groove corresponding to the push card.

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