A relay moving spring injection molding structure and a relay
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-07
- Publication Date
- 2026-08-14
AI Technical Summary
[0002]在继电器制造领域，需要将动簧与衔铁固定，动簧一般沿长度方向依次设有注塑部、连接部和动触部，动触部与动触点固接，现有技术中一般将注塑件与动簧的注塑部注塑成一体，注塑部和注塑件上均设有通孔用于与衔铁固接，注塑件的长度方向则为动簧的宽度方向，注塑部在动簧宽度方向的长度与注塑件的长度往往接近，尺寸相对较大，所需要的材料成本较高，此外，动簧与注塑件注塑时，除了需要在连接部和/或动触部处施以顶杆以对动簧的宽度方向和厚度方向进行固定之外，还需要在动簧的注塑部施加顶杆以进行动簧注塑部的固定，以防止动簧的注塑部发生移动或偏摆，但注塑部处顶杆的使用，使得注塑件在成型之后会留下工艺孔，工艺孔需要产线工人手动进行点胶填补，工序所需的产线人员多，且生产效率低，且顶杆的使用增加了模具复杂度
[0018]In technical solution one, the injection-molded part is configured to be enclosed by the injection-molded part between the two connecting holes. This means that the dimension of the injection-molded part in the width direction of the moving spring body (which can also be understood as the length direction of the injection-molded part) is reduced. Compared with the existing technology where "the dimension of the injection-molded part in the width direction of the moving spring body is close to the length of the injection-molded part," on the one hand, the dimension of the injection-molded part in the direction perpendicular to the thickness of the moving spring body is reduced, reducing the use of metal materials and lowering material costs; on the other hand, the force-bearing area of the injection-molded part impacted by the molten plastic is reduced, making the injection-molded part less prone to displacement or swaying due to impact, thereby providing... Eliminating the need for ejector pins provides the necessary conditions. Furthermore, this design allows the injection molding section to be subjected to the impact of the flowing molten plastic during injection molding at a position closer to the center of the spring body's width. In other words, it reduces the distance between the force-bearing position and the ejector pin used to abut against the center of the moving contact or other positions along the width of the spring body. This results in a smaller torque, making it less prone to movement or swaying. Ejector pins can be eliminated from the injection molding section, reducing module complexity and resolving the issue of process holes left after injection molding. This also eliminates the need for dispensing and improves production efficiency.
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Figure CN224637172U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of relay technology, specifically to a relay moving spring injection molding structure and a relay. Background Technology
[0002] In relay manufacturing, the moving spring needs to be fixed to the armature. The moving spring typically has a molded part, a connecting part, and a moving contact arranged sequentially along its length. The moving contact is fixedly connected to the moving contact point. In existing technology, the injection-molded part and the injection-molded part of the moving spring are generally injection-molded as a single unit. Both the injection-molded part and the injection-molded part have through holes for fixing to the armature. The length of the injection-molded part is the width of the moving spring. The length of the injection-molded part in the width direction of the moving spring is often close to the length of the injection-molded part, resulting in a relatively large size and higher material costs. Furthermore, the moving spring and the injection-molded part... When injection molding plastic parts, in addition to applying ejector pins at the connecting parts and / or moving contacts to fix the width and thickness of the moving spring, ejector pins are also needed at the injection part of the moving spring to fix the injection part of the moving spring and prevent the injection part of the moving spring from moving or swaying. However, the use of ejector pins at the injection part leaves process holes after the injection part is molded. The process holes need to be manually filled with glue by production line workers. The process requires more production line workers and has low production efficiency. Moreover, the use of ejector pins increases the complexity of the mold. Utility Model Content
[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and provide a relay moving spring injection molding structure and relay, which does not require top rod positioning, eliminates process holes, and maintains the pull-out resistance of the moving spring body and the injection molded part.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] Technical Solution 1: A relay moving spring injection molding structure includes a moving spring body and an injection molded part. The moving spring body has an injection molded part and a moving contact part along its length direction. The injection molded part is adapted to be fixedly connected to an armature, and the moving contact part is adapted to be fixedly connected to a moving contact. The injection molded part is injection molded integrally with the injection molded part and is used to be fixedly connected to the armature. The injection molded part has two connecting holes spaced apart along the width direction of the moving spring body for fixing to the armature. The injection molded part is configured to be wrapped by the injection molded part between the two connecting holes.
[0006] Technical Solution 2 based on Technical Solution 1: The moving spring body further includes a connecting portion that connects the injection molding part and the moving contact part along the length direction of the moving spring body; at least one protrusion is provided on at least one side of the injection molding part in the width direction; on the projection plane perpendicular to the length direction of the moving spring body, at least a portion of the projection of the protrusion is located outside the width direction of the connecting portion.
[0007] Technical solution three based on technical solution two: at least one of the protrusions has a pointed tip at one end on the opposite side away from the width direction of the injection part.
[0008] Technical solution four based on technical solution two: At least one protrusion is provided on both sides of the injection molding part in the width direction.
[0009] Technical solution five based on technical solution four: At least two protrusions are provided on both sides of the injection molding part in the width direction, which are spaced apart along the length direction of the moving spring body, and the protrusions on both sides of the injection molding part in the width direction are symmetrically arranged.
[0010] Technical solution six based on technical solution four: The injection molding part has protrusions on both sides in the width direction, and the protrusions on both sides in the width direction are symmetrically arranged. The protrusions have arc-shaped grooves with openings facing the axis of the corresponding connecting holes.
[0011] Technical solution seven based on technical solution two: at least one of the protrusions has a stop surface on the side facing the moving contact; the stop surface is parallel to the width direction of the moving spring body or inclined relative to the length direction of the moving spring body, and the outer end of the stop surface is closer to the moving contact than the inner end along the width direction of the moving spring body.
[0012] Technical solution eight, based on any one of technical solutions two to seven: The injection molding part is provided with at least one through hole that extends along the thickness direction of the moving spring body.
[0013] Technical solution nine based on technical solution eight: Along the width direction of the moving spring body, the through hole is arranged to avoid the protrusion and is located in the middle of the injection molding part.
[0014] Technical solution ten based on technical solution nine: the thickness of the injection molding part is greater than or equal to the thickness of the connecting part.
[0015] Technical Solution Eleven, based on Technical Solution One: The injection molding part is located in the middle of the injection molded part along the length and / or width direction of the moving spring body.
[0016] In addition, this utility model also provides technical solution twelve, which relates to a relay, including the relay moving spring injection molding structure described in any one of technical solutions one to eleven.
[0017] As can be seen from the above description of this utility model, compared with the prior art, this utility model has the following beneficial effects:
[0018] In technical solution one, the injection-molded part is configured to be enclosed by the injection-molded part between the two connecting holes. This means that the dimension of the injection-molded part in the width direction of the moving spring body (which can also be understood as the length direction of the injection-molded part) is reduced. Compared with the existing technology where "the dimension of the injection-molded part in the width direction of the moving spring body is close to the length of the injection-molded part," on the one hand, the dimension of the injection-molded part in the direction perpendicular to the thickness of the moving spring body is reduced, reducing the use of metal materials and lowering material costs; on the other hand, the force-bearing area of the injection-molded part impacted by the molten plastic is reduced, making the injection-molded part less prone to displacement or swaying due to impact, thereby providing... Eliminating the need for ejector pins provides the necessary conditions. Furthermore, this design allows the injection molding section to be subjected to the impact of the flowing molten plastic during injection molding at a position closer to the center of the spring body's width. In other words, it reduces the distance between the force-bearing position and the ejector pin used to abut against the center of the moving contact or other positions along the width of the spring body. This results in a smaller torque, making it less prone to movement or swaying. Ejector pins can be eliminated from the injection molding section, reducing module complexity and resolving the issue of process holes left after injection molding. This also eliminates the need for dispensing and improves production efficiency.
[0019] In technical solution two, the width direction of the injection molding part is also the width direction of the moving spring body. At least one side of the injection molding part in the width direction has at least one protrusion, which is embedded in the injection molded part to form a mechanical lock, enhancing the bonding strength between the injection molded part and the moving spring body, preventing dislodgement, resisting the pull-out force when the moving spring body swings, and compensating for the decrease in bonding force caused by the reduction in the size of the injection molding part, thus ensuring structural reliability. On the projection plane perpendicular to the length direction of the moving spring body, the projection of the protrusion is located outside the width direction of the connection part. The protrusion extends beyond the width boundary of the connection part, which is equivalent to shifting the point of action of the pull-out resistance outward, increasing the lever arm length. When the injection molded part is subjected to tension, the resisting torque (resistance torque = tension force × lever arm) generated by the protrusion is greater, significantly reducing the risk of disengagement and improving the overall resistance to deformation.
[0020] In technical solution three, at least one protrusion has a pointed tip at one end on the opposite side away from the width direction of the injection part. The pointed tip can form a "barb effect", which further increases the resistance to pull-out, further enhances the bonding strength between the injection molded part and the moving spring body, and can also optimize the flow path of the injection molding material and improve the filling density of the plastic melt.
[0021] In technical solution four, at least one protrusion is provided on both sides of the injection part in the width direction. The two protrusions are balanced to avoid warping caused by unbalanced forces on both sides.
[0022] In technical solution five, at least two protrusions are provided on both sides of the injection molding part in the width direction, which are spaced apart along the length direction of the moving spring body. The protrusions on both sides of the injection molding part in the width direction are symmetrically arranged, which can form multi-level locking in the length direction of the injection molding part to resist pull-out forces in different directions.
[0023] In technical solution six, the protrusion has an arc-shaped groove with its opening facing the axis of the corresponding connecting hole. The arc-shaped groove adapts to the shape of the connecting through hole, maximizing the area of the injection molding part within a limited space. The two ends of the arc-shaped groove naturally form two high-strength pull-out points, which can enhance the locking effect. In addition, the contour of the arc-shaped groove adopts rounded corners or a gradient curve to avoid sharp edges. When the moving spring body swings at high frequency, stress tends to concentrate at the point of structural change (such as right angle). The smooth transition of the arc-shaped groove makes the stress evenly distributed along the contour, avoiding excessive local stress that could lead to cracks.
[0024] In technical solution seven, the anti-reverse surface is parallel to the width direction of the moving spring body or inclined relative to the length direction of the moving spring body, and the outer end of the anti-reverse surface is closer to the moving contact than the inner end along the width direction of the moving spring body. The extension direction of the anti-reverse surface is more likely to form a reverse angle with the flow direction of the plastic melt in the mold. After solidification, it forms a physical interlock, which further enhances the resistance to the pull-out force of the moving spring body.
[0025] In technical solution eight, the injection molding section has at least one through hole extending along the thickness direction of the moving spring body. When the molten plastic fills the through hole, it forms a columnar rivet anchoring structure, enhancing the bonding strength between the injection molding section and the injection molded part. The through hole also guides the flow of the molten plastic, preventing localized insufficient filling. Furthermore, the through hole reduces the amount of metal used in the moving spring body, lowering material costs. When there are multiple through holes, the multi-hole anchoring forms a distributed locking mechanism, further improving the bonding strength between the injection molding section and the injection molded part. The spacing between the through holes optimizes the melt flow pressure distribution, promotes melt diversion and venting, and improves the uniformity of the injection molding material coating.
[0026] In technical solution nine, the through hole is positioned in the middle of the injection molding part, avoiding the protrusion, along the width direction of the moving spring body. This serves several purposes: First, it ensures the integrity of the protrusion's root structure, preventing the risk of breakage due to stress concentration. Second, it allows the injection molding material to form a "columnar rivet," establishing a high-strength anchor point in the central area, creating a double-layered anti-pull-out defense line with the edge protrusion. The edge protrusion provides lateral locking force, while the central through hole provides vertical anchoring force. Third, the central opening makes the wall thickness of the injection molded part more uniform, reducing shrinkage marks or warping caused by differences in cooling rates and improving product yield.
[0027] In technical solution ten, the thickness of the injection-molded part is greater than or equal to the thickness of the connecting part. The thickened injection-molded part can compensate for the strength loss caused by the reduction in the size of the injection-molded part, and the increased bonding area between the thickened injection-molded part and the injection-molded part improves the pull-out resistance. The greater thickness of the injection-molded part also ensures that it still has high strength even when multiple through holes are made in the injection-molded part.
[0028] In technical solution eleven, the central arrangement of the injection molding section ensures that the injection molded part is subjected to uniform force, avoiding stress concentration caused by eccentricity.
[0029] Technical solution twelve has the technical advantages of any one of technical solutions one through eleven. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the injection-molded relay moving spring structure of Embodiment 1 of this application after injection molding;
[0032] Figure 2 This is a three-dimensional exploded view of the injection-molded structure of the relay moving spring in Embodiment 1 of this application;
[0033] Figure 3 for Figure 1 Top view;
[0034] Figure 4 for Figure 3 Sectional view along the AA direction;
[0035] Figure 5 for Figure 1 Side view;
[0036] Figure 6 for Figure 5 Sectional view in the BB direction;
[0037] Figure 7 This is a schematic diagram of the moving spring body in Embodiment 2 of this application;
[0038] Figure 8 This is a three-dimensional exploded view of the injection-molded structure of the relay moving spring in Embodiment 3 of this application;
[0039] Figure 9 This is a cross-sectional view of the injection-molded structure of the relay moving spring in Embodiment 3 of this application. Figure 1 ;
[0040] Figure 10 This is a cross-sectional view of the injection-molded structure of the relay moving spring in Embodiment 3 of this application. Figure 2 ;
[0041] Figure 11 This is a side view of the moving spring body 10 of Embodiment 4 of this application.
[0042] Explanation of key figure labels:
[0043] The spring body 10; injection molding part 11; protrusion 111; tip 112; anti-reverse surface 113; through hole 114; connecting part 12; moving contact part 13; injection molded part 20; connecting hole 21. Detailed Implementation
[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0045] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.
[0046] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.
[0047] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.
[0048] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".
[0049] Example 1
[0050] This utility model relates to a relay moving spring injection molding structure, see [link to related information]. Figure 1 The relay moving spring injection molding structure is generally "I" shaped, including the moving spring body 10 and the injection molded part 20, see [reference]. Figure 2The moving spring body 10 is T-shaped, and the injection molded part 20 extends along the width direction of the moving spring body 10. The moving spring body 10 has an injection molded portion 11 and a moving contact portion 13 along its length direction. In this embodiment, the injection molded portion 11 and the moving contact portion 13 are spaced apart. The moving spring body 10 also includes a connecting portion 12 connecting the injection molded portion 11 and the moving contact portion 13 along its length direction. That is, the moving spring body 10 has an injection molded portion 11, a connecting portion 12, and a moving contact portion 13 sequentially along its length direction. The injection molded portion 11 and the connecting portion 12 are both located in the vertical section of the T-shape, while the moving contact portion 13 is located in the horizontal section of the T-shape. The injection molded portion 11 is adapted to be fixedly connected to the armature (not shown in the figure) via the injection molded part 20, and the moving contact portion 13 is adapted to be fixedly connected to the moving contact. The injection molded part 20 is injection molded integrally with the injection molded portion 11 and is used for fixed connection to the armature. See [reference needed]. Figure 1 The injection-molded part 20 has two connecting holes 21 spaced apart along the width direction of the moving spring body 10 for fixing to the armature. In this embodiment, see [reference needed]. Figure 3-6 The injection-molded portion 11 is configured to be enclosed by the injection-molded part 20 between the two connecting holes 21. In this embodiment, the injection-molded portion 11 is located at the middle of the injection-molded part 20 along the width direction of the moving spring body 10. In the following description, the width direction of the injection-molded portion 11 is the same as the width direction of the moving spring body 10.
[0051] See also Figure 2 At least one protrusion 111 is provided on at least one side of the injection molding portion 11 in the width direction; on the projection plane perpendicular to the length direction of the moving spring body 10, at least a portion of the projection of the protrusion 111 is located outside the width direction of the connecting portion 12. At least one protrusion 111 has a tip 112 at one end away from the width direction of the injection molding portion 11. In this embodiment, at least one protrusion 111 protrudes from both sides of the injection molding portion 11 in the width direction. At least two protrusions 111 are provided on each side of the injection molding portion 11 in the width direction, which are spaced apart along the length direction of the moving spring body 10, and the protrusions 111 on both sides of the injection molding portion 11 in the width direction are symmetrically arranged. Figure 2 Although only two protrusions 111 are shown symmetrically arranged on both sides of the injection-molded portion 11 in the width direction, spaced apart along the length direction of the moving spring body 10, it should be understood that the number of protrusions 111 can be set as needed, and in other embodiments, the protrusions 111 on both sides of the injection-molded portion 11 in the width direction can also be arranged asymmetrically. At least one protrusion 111 has a stop surface 113 on the side facing the moving contact portion 13; the stop surface 113 is parallel to the width direction of the moving spring body 10. Figure 2 Each of the protrusions 111 has a stop surface 113 that is parallel to the width direction of the moving spring body 10.
[0052] In this embodiment, the thickness of the injection-molded part 11 is equal to the thickness of the connecting part 12, and the injection-molded part 11 is provided with at least one through hole 114 extending along the thickness direction of the moving spring body 10. Figure 2In this embodiment, there is one through hole 114, which is located along the width direction of the spring body 10, avoiding the protrusion 111 and situated in the middle of the injection molding portion 11. In other embodiments, there may be more than two through holes 114, and preferably both of them are located avoiding the protrusion 111.
[0053] In this embodiment, the injection-molded part 11 is configured to be enclosed by the injection-molded part 20 between the two connecting holes 21. This also means that the size of the injection-molded part 11 in the width direction of the moving spring body 10 (which can also be understood as the length direction of the injection-molded part 20) is reduced. Compared with the prior art where "the size of the injection-molded part 11 in the width direction of the moving spring body 10 is close to the length of the injection-molded part 20", on the one hand, the size of the injection-molded part 11 in the direction perpendicular to the thickness of the moving spring body 10 is reduced, reducing the use of metal materials and lowering material costs; on the other hand, the force-bearing area of the injection-molded part 11 impacted by the plastic melt is reduced, making the injection-molded part 11 less prone to displacement due to impact. This design allows for the elimination of the use of ejector pins, as the injection molding part 11 is subjected to impact from the flowing molten plastic during injection more closely to the center of the width direction of the moving spring body 10. In other words, it reduces the distance between the force-bearing position and the ejector pin used to abut against the center of the moving contact part 13 or other positions of the moving spring body 10 along the width direction. This results in a smaller torque and makes it less prone to movement or swaying. Ejector pins can be eliminated from the injection molding part 11, reducing module complexity and solving the problem of process holes left after injection molding. This also eliminates the need for dispensing and improves production efficiency.
[0054] In this embodiment, at least one protrusion 111 protrudes from at least one side of the injection molding part 11 in the width direction. The protrusion 111 is embedded in the injection molded part 20 to form a mechanical lock, which enhances the bonding strength between the injection molded part 20 and the moving spring body 10, prevents it from coming off, resists the pull-out force when the moving spring body 10 swings, and also compensates for the decrease in bonding force caused by the reduction in the size of the injection molding part 11, ensuring structural reliability. On the projection plane perpendicular to the length direction of the moving spring body 10, the projection of the protrusion 111 is located outside the width direction of the connecting part 12. The protrusion 111 extends beyond the width boundary of the connecting part 12, which is equivalent to moving the point of action of the pull-out resistance outward, increasing the lever arm length. When the injection molded part 20 is subjected to tension, the resistance torque (resistance torque = tension force × lever arm) generated by the protrusion 111 is larger, which greatly reduces the risk of disengagement and improves the overall anti-deformation ability.
[0055] In this embodiment, at least one protrusion 111 has a tip 112 at one end on the other side away from the width direction of the injection part 11. The tip 112 can form a "barb effect", which further increases the resistance to pull-out, further enhances the bonding strength between the injection part 20 and the moving spring body 10, and can also optimize the flow path of the injection material and improve the filling density of the plastic melt.
[0056] In this embodiment, at least one protrusion 111 is provided on both sides of the injection part 11 in the width direction. The two protrusions 111 are balanced by the force, avoiding warping caused by the imbalance of the force on both sides.
[0057] In this embodiment, at least two protrusions 111 are provided on both sides of the injection molding part 11 in the width direction, and are spaced apart along the length direction of the moving spring body 10. The protrusions 111 on both sides of the injection molding part 11 in the width direction are symmetrically arranged, which can form multi-level locking in the length direction of the injection molding part 11 to resist pull-out forces in different directions.
[0058] In this embodiment, the anti-reverse surface 113 is parallel to the width direction of the moving spring body 10, and the extension direction of the anti-reverse surface 113 is more likely to form a reverse angle with the flow direction of the plastic melt in the mold. After solidification, it forms a physical interlock, which further enhances the resistance to the pull-out force of the moving spring body 10.
[0059] In this embodiment, the injection molding part 11 is provided with at least one through hole 114 extending along the thickness direction of the moving spring body 10. When the plastic melt fills the through hole 114, it forms a columnar rivet anchoring structure, which enhances the bonding strength between the injection molding part 11 and the injection molded part 20. The through hole 114 can also guide the flow of the plastic melt and avoid local insufficient filling. In addition, the through hole 114 can reduce the amount of metal used in the moving spring body 10 and reduce material costs.
[0060] In this embodiment, the through hole 114 is positioned in the middle of the injection molding part 11, avoiding the protrusion 111, along the width direction of the moving spring body 10. This serves several purposes: First, it ensures the integrity of the root structure of the protrusion 111, preventing the risk of breakage due to stress concentration. Second, it allows the injection molding material to form a "columnar rivet" after filling, establishing a high-strength anchor point in the middle region, forming a double anti-pull-out defense line with the edge protrusion 111. The edge protrusion 111 can generate a lateral locking force, while the through hole 114 in the middle can provide a vertical anchoring force. Third, the central opening makes the wall thickness of the injection molded part 20 more uniform, reducing shrinkage marks or warping caused by differences in cooling rates, and improving product yield.
[0061] Example 2
[0062] Example 2 has a structure that is basically the same as that of Example 1, except that, see [link to example]. Figure 7 Along the length direction of the moving spring body 10, the anti-retraction surface 113 near the moving contact 13 is inclined relative to the length direction of the moving spring body 10, and the outer end of the anti-retraction surface 113 along the width direction of the moving spring body 10 is closer to the moving contact 13 than the inner end, while the anti-retraction surface 113 away from the moving contact 13 is still parallel to the width direction of the moving spring body 10.
[0063] In this embodiment, the anti-retraction surface 113 near the moving contact 13 is inclined relative to the length direction of the moving spring body 10, and the outer end of the anti-retraction surface 113 along the width direction of the moving spring body 10 is closer to the moving contact 13 than the inner end. The extension direction of the anti-retraction surface 113 is more likely to form a reverse angle with the flow direction of the plastic melt in the mold. After solidification, a physical interlock is formed, which further enhances the resistance to the pull-out force of the moving spring.
[0064] Example 3
[0065] The structure of the connecting part 12 and the moving contact part 13 in Embodiment 3 is basically the same as that in Embodiment 1. The difference is that in Embodiment 3, see [link to Embodiment 1]. Figure 8-10 The injection molding part 11 is located in the middle of the injection molded part 20 along both the length and width directions of the moving spring body 10. In this embodiment, protrusions 111 are provided on both sides of the injection molding part 11 in the width direction, and the protrusions 111 on both sides of the injection molding part 11 in the width direction are symmetrically arranged. There is one protrusion 111 on each side of the injection molding part 11 in the width direction. The protrusion 111 has an arc-shaped groove with its opening facing the axis of the corresponding connecting hole 21, and two tips 112 are formed at both ends of the arc-shaped groove. In addition, in this embodiment, both protrusions 111 have a stop surface 113 parallel to the width direction of the moving spring body 10. There are multiple through holes 114. Figure 8 The example shown is a case where the number of through holes 114 is three.
[0066] In this embodiment, the central arrangement of the injection molding part 11 ensures that the injection molded part 20 is subjected to uniform force, avoiding stress concentration caused by eccentricity. When there are multiple through holes 114, the multi-hole anchoring forms a distributed locking mechanism, which further improves the bonding strength between the injection molding part 11 and the injection molded part 20. In addition, the hole spacing of the through holes 114 optimizes the melt flow pressure distribution, promotes melt diversion and venting, and improves the uniformity of the injection molding material coating.
[0067] In this embodiment, the protrusion 111 is provided with an arc-shaped groove with its opening facing the axis of the corresponding connecting hole 21. The arc-shaped groove is adapted to the shape of the connecting through hole, maximizing the area of the injection molding part 11 within a limited space. The two ends of the arc-shaped groove naturally form two high-strength pull-out points, which can enhance the locking effect. In addition, the contour of the arc-shaped groove adopts rounded corners or a gradient curve to avoid sharp edges. When the moving spring body 10 swings at high frequency, the stress is easily concentrated at the point of structural change (such as a right angle). The smooth transition of the arc-shaped groove makes the stress evenly distributed along the contour, avoiding excessive local stress that could lead to cracks.
[0068] Example 4
[0069] Example 4 has a structure that is basically the same as Example 3, except that, see [link to example]. Figure 11In this embodiment, the thickness of the injection-molded portion 11 is greater than the thickness of the connecting portion 12. The thickened injection-molded portion 11 can compensate for the strength loss caused by the reduction in the size of the injection-molded portion 11, and the increased bonding area between the thickened injection-molded portion 11 and the injection-molded part 20 improves the pull-out resistance. The greater thickness of the injection-molded portion 11 also ensures that the injection-molded portion 11 still has high strength even with multiple through holes 114.
[0070] Example 5
[0071] This embodiment also provides a relay, which includes the relay moving spring injection molding structure of any one of embodiments 1-4.
[0072] This embodiment inherits the technical advantages of any of embodiments 1-4.
[0073] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.
Claims
1. A relay spring injection molding structure, comprising a spring body (10) and an injection molded part (20), wherein the spring body (10) is provided with an injection molded portion (11) and a moving contact portion (13) along its length direction, the moving contact portion (13) being adapted to be fixedly connected to a moving contact, the injection molded part (20) being integrally injection molded with the injection molded portion (11) and used for fixedly connecting to an armature, the injection molded part (20) being provided with two connecting holes (21) spaced apart along the width direction of the spring body (10) for fixedly connecting to the armature, characterized in that, The injection molding portion (11) is configured to be enclosed by the injection molding part (20) between the two connecting holes (21).
2. The relay moving spring injection molding structure as described in claim 1, characterized in that, The moving spring body (10) further includes a connecting portion (12) that connects the injection molding portion (11) and the moving contact portion (13) along the length direction of the moving spring body (10); at least one protrusion (111) is provided on at least one side of the injection molding portion (11) in the width direction; on the projection plane perpendicular to the length direction of the moving spring body (10), at least a portion of the projection of the protrusion (111) is located outside the width direction of the connecting portion (12).
3. The relay moving spring injection molding structure as described in claim 2, characterized in that, At least one of the protrusions (111) has a tip (112) at one end on the opposite side away from the width direction of the injection part (11).
4. The injection-molded structure of a relay moving spring as described in claim 2, characterized in that, The injection molding part (11) has at least one protrusion (111) on both sides in the width direction.
5. The relay moving spring injection molding structure as described in claim 4, characterized in that, At least two protrusions (111) are provided on both sides of the injection molding part (11) in the width direction, and are arranged at intervals along the length direction of the moving spring body (10), and the protrusions (111) on both sides of the injection molding part (11) in the width direction are symmetrically arranged.
6. The injection-molded structure of a relay moving spring as described in claim 4, characterized in that, The injection molding part (11) has protrusions (111) on both sides in the width direction, and the protrusions (111) on both sides in the width direction are symmetrically arranged. The protrusions (111) have arc-shaped grooves with openings facing the axis of the corresponding connecting hole (21).
7. The injection-molded structure of a relay moving spring as described in claim 2, characterized in that, At least one of the protrusions (111) has a stop surface (113) on the side facing the moving contact (13); the stop surface (113) is parallel to the width direction of the moving spring body (10) or inclined relative to the length direction of the moving spring body (10), and the outer end of the stop surface (113) is closer to the moving contact (13) than the inner end along the width direction of the moving spring body (10).
8. A relay moving spring injection molding structure as described in any one of claims 2-7, characterized in that, The injection molding part (11) is provided with at least one through hole (114) that extends through the thickness direction of the moving spring body (10).
9. The injection-molded structure of a relay moving spring as described in claim 8, characterized in that, Along the width direction of the moving spring body (10), the through hole (114) is provided to avoid the protrusion (111) and is located in the middle of the injection part (11).
10. The injection-molded structure of a relay moving spring as described in claim 9, characterized in that, The thickness of the injection molding part (11) is greater than or equal to the thickness of the connecting part (12).
11. The injection-molded structure of a relay moving spring as described in claim 1, characterized in that, The injection molding part (11) is located in the middle of the injection molding part (20) along the length and / or width direction of the moving spring body (10).
12. A relay, characterized in that, The relay moving spring injection molding structure includes any one of claims 1-11.