Push rod assembly, preparation method thereof and relay

Abstract

The invention relates to the technical field of electronic control devices, in particular to a push rod assembly, a preparation method thereof and a relay. The push rod assembly comprises a push rod, a first injection molding part and a second injection molding part, the second injection molding part covers at least part of the first injection molding part, and the second injection molding part and the first injection molding part are matched to form an insulating seat; the first injection molding piece comprises a limiting part, and the limiting part abuts against the axial end face of the side, stretching into the insulating base, of the push rod. The push rod assembly can improve the injection molding precision of all structural parts in the push rod assembly, reduce the injection molding difficulty, improve the preparation efficiency and further improve the structural performance of the push rod assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic control devices, and in particular to a push rod assembly and a preparation method thereof, and a relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. A relay is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] The existing relay is provided with a push rod assembly, and each structural member in the push rod assembly is assembled on an insulating seat. It is worth noting that when forming the push rod assembly, the assembly position of each structural member in the insulating seat is difficult to control, and it is difficult to ensure the accuracy of assembly.

[0004] For example, taking the push rod as an example, the push rod is fixed in the insulating seat along the axial direction of the push rod. During assembly, an assembly tool is required to limit the push rod and the insulating seat in the axial direction of the push rod, which is complicated and difficult to assemble. However, if the tool is not used, the push rod cannot be assembled to the preset position of the insulating seat along its axial direction. Summary of the invention

[0005] The embodiment of the present invention provides a push rod assembly and a preparation method thereof, and a relay. The push rod assembly can improve the injection molding accuracy of various structural parts in the push rod assembly, reduce the difficulty of injection molding, improve the preparation efficiency, and further improve the structural performance of the push rod assembly.

[0006] An embodiment of the present invention provides a push rod assembly, comprising: a push rod, a first injection-molded part and a second injection-molded part, wherein the second injection-molded part covers at least a portion of the first injection-molded part, and the second injection-molded part cooperates with the first injection-molded part to form an insulating seat; the first injection-molded part comprises a limiting portion, and the limiting portion abuts against an axial end face of one side of the push rod extending into the insulating seat.

[0007] According to some embodiments of the present invention, the first injection-molded part also includes a main body portion, the main body portion is provided with a through hole, and the first injection-molded part is sleeved on the outside of the push rod through the through hole; the limiting portion extends from one side of the main body portion and abuts against the axial end face of one side of the push rod extending into the insulating seat.

[0008] According to some embodiments of the present invention, along the axial direction of the push rod, at least a portion of the projection of the limiting portion on the main body is located in the through hole, and the limiting portion abuts against an axial end face of one side of the push rod extending into the through hole.

[0009] According to some embodiments of the present invention, the limiting portion connects two opposite sides of the main body; along the axial direction of the push rod, the projection of the limiting portion on the main body covers the axial center line of the through hole.

[0010] According to some embodiments of the present invention, the limiting portion connects hole walls on two opposite sides of the through hole.

[0011] According to some embodiments of the present invention, at least a portion of the second injection-molded part is located between a peripheral side surface of the push rod and a hole wall of the first injection-molded part forming the through hole.

[0012] According to some embodiments of the present invention, the first injection molded part is provided with a positioning hole, and along the radial direction of the positioning hole, the positioning hole is provided on at least one side of the through hole.

[0013] According to some embodiments of the present invention, the first injection-molded part further includes a protrusion, and along the axial direction of the push rod, at least one side of the main body is provided with the protrusion; the second injection-molded part is partially covered on the surface of the first injection-molded part, and along the axial direction of the push rod, the surface of the protrusion is exposed to the surface of the second injection-molded part.

[0014] According to some embodiments of the present invention, there are multiple protrusions, and the multiple protrusions are arranged at intervals around the axis of the push rod.

[0015] According to some embodiments of the present invention, a metal bracket is further included, which includes a base plate, at least part of which is wrapped in the second injection-molded part; along the axial direction of the push rod, the base plate abuts against the surface of the protrusion of the second injection-molded part exposed on the side away from the push rod.

[0016] According to some embodiments of the present invention, the metal bracket also includes a top plate and a side plate, the side plate is connected to the bottom plate, and the two side plates are located on the same side of the bottom plate; the top plate is installed on one end of the two side plates away from the insulating seat, and the top plate is connected to each of the side plates.

[0017] According to some embodiments of the present invention, the metal bracket is connected to the insulating seat and the pushing rod by integral injection molding.

[0018] According to some embodiments of the present invention, the push rod is connected to the insulating seat by integral injection molding.

[0019] An embodiment of the present invention further provides a relay, comprising a push rod assembly as provided by any of the above technical solutions.

[0020] An embodiment of the present invention further provides a method for preparing a push rod assembly, comprising:

[0021] Provide a push rod and a first injection molded part, and abut one side axial end surface of the push rod against the limiting portion of the first injection molded part so that the push rod and the first injection molded part are assembled in place;

[0022] Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part, so that the second injection molded part partially covers the surface of the first injection molded part and cooperates with the first injection molded part to form an insulating seat.

[0023] According to some embodiments of the present invention, after the second injection-molded part is formed on the surface of the first injection-molded part through the injection molding process, at least a portion of the second injection-molded part is located between the peripheral side surface of the push rod and the first injection-molded part.

[0024] According to some embodiments of the present invention, the preparation method of forming the second injection molded part on the surface of the first injection molded part through an injection molding process further includes:

[0025] Providing a metal bracket, and making the bottom plate of the metal bracket abut against the surface of one side of the protrusion of the first injection molded part facing away from the push rod;

[0026] Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part after assembling the metal bracket, so that the second injection molded part is partially covered on the surface of the first injection molded part, and at least a part of the base plate is controlled to be covered in the second injection molded part.

[0027] An embodiment of the above invention has at least the following advantages or beneficial effects:

[0028] In the push rod assembly provided by the present invention, the first injection molded part and the second injection molded part form an insulating seat, and the first injection molded part and the second injection molded part can be assembled with the push rod respectively. Specifically, the limiting part in the first injection molded part is equivalent to a stop structure, which can limit the maximum displacement of the push rod along one side of the axial direction. On the side where the limiting part is provided, there is no need for tooling to support the push rod from the top hole of the push rod for positioning, which is convenient for simplifying the preparation of tooling, reducing the difficulty of preparation and improving the efficiency of preparation. Accordingly, in this embodiment, the structural setting of the limiting part can save the number of assembly tooling, simplify the mold, and reduce the difficulty of assembly and improve the efficiency of assembly.

[0029] At the same time, when the limiting part is used to limit the axial end of the push rod, it can avoid that the second injection molded part has a small hole at the tooling position corresponding to the top of the push rod, thereby eliminating the situation where the small hole causes the creepage distance from other metal structural parts in the push rod assembly to the push rod to be reduced. Accordingly, the insulation level of the push rod assembly provided by the present invention can be improved, thereby improving the safety performance.

[0030] In addition, since the second injection molded part can be molded later than the first injection molded part, the other structural parts in the push rod assembly can be assembled based on the combined structure prepared by the previous injection molding process, so as to further reduce the injection molding difficulty of each structural part in the push rod assembly and improve the structural performance of the push rod assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 What is shown is a simplified schematic diagram of the structure of a push rod assembly provided by an embodiment of the present invention;

[0032] Figure 2 The figure shows a first structural schematic diagram of the auxiliary movable spring in the push rod assembly provided by the embodiment of the present invention after being assembled with the first injection molded part;

[0033] Figure 3 The figure shows a schematic diagram of the structure of an auxiliary movable spring in a push rod assembly provided by an embodiment of the present invention;

[0034] Figure 4 It is shown that Figure 2 A cross-sectional view of the structure;

[0035] Figure 5 The figure shows a second structural schematic diagram of the auxiliary movable spring in the push rod assembly provided by the embodiment of the present invention after being assembled with the first injection molded part;

[0036] Figure 6 It is shown that Figure 5 A cross-sectional view of the structure;

[0037] Figure 7 What is shown is a schematic structural diagram of a push rod assembly in an embodiment of the present invention;

[0038] Figure 8 It is shown that Figure 7 Exploded schematic diagram of the structure;

[0039] Fig. 9 It is shown that Figure 7 Schematic diagram of the structure at another angle

[0040] Fig.10 It is shown that Fig. 9 A cross-sectional view of the structure;

[0041] Fig.11 Shown Fig.10 Cross-sectional view of the structure in the middle when applied to a relay;

[0042] Fig.12 Shown is a flow chart of a method for preparing a push rod assembly provided by an embodiment of the present invention.

[0043] The following are the descriptions of the reference numerals:

[0044] 100, auxiliary moving spring; 110, through hole; 120, positioning hole; 200, first injection molded part; 210, main body; 211, through hole; 212, positioning hole; 220, limit part; 230, protrusion; 300, second injection molded part; 400, push rod; 500, metal bracket; 510, bottom plate; 520, side plate; 530, top plate; 600, elastic part; 700, moving spring; 800, auxiliary contact lead-out terminal. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0046] In a first aspect, an embodiment of the present invention provides a push rod assembly. Figure 1 and Figures 5 to 9 As shown, the push rod assembly provided by the embodiment of the present invention includes: a push rod 400, a first injection-molded part 200 and a second injection-molded part 300, the second injection-molded part 300 covers at least a portion of the first injection-molded part 200, and the second injection-molded part 300 cooperates with the first injection-molded part 200 to form an insulating seat; the first injection-molded part 200 includes a limiting portion 220, and the limiting portion 220 abuts against an axial end face of one side of the push rod 400 extending into the insulating seat.

[0047] It should be understood that Figure 1 The structure of the middle push rod 400, the first injection molded part 200 and the second injection molded part 300 is only an exemplary description, and the specific shape is not limited thereto; wherein the first injection molded part 200 and the second injection molded part 300 together form an insulating seat for assembling an elastic member. Exemplarily, the elastic member can be a contact spring or a leaf spring.

[0048] It should be noted that in the push rod assembly provided in the embodiment of the present invention, the first injection molded part 200 and the second injection molded part 300 form an insulating seat, and the first injection molded part 200 and the second injection molded part 300 can be assembled with the push rod 400 respectively. Specifically, in the implementation of the present invention, the limiting portion 220 is equivalent to a stop structure, which can limit the maximum displacement of the push rod 400 along one side of the axial direction. On the side where the limiting portion 220 is provided, there is no need for tooling to support the push rod 400 from the top opening of the push rod 400 for positioning, which is convenient for simplifying the preparation of tooling, reducing the difficulty of preparation and improving the efficiency of preparation. Accordingly, in this embodiment, the structural setting of the limiting portion 220 can save the number of assembly tooling, simplify the mold, and reduce the difficulty of assembly and improve the efficiency of assembly.

[0049] At the same time, when the limiting portion 220 is used to limit the axial end of the push rod 400, it is possible to avoid leaving a small hole in the second injection molded part 300 at the top tooling position corresponding to the push rod 400, thereby eliminating the situation where the small hole causes the reduction of the creepage distance from other metal structural parts in the push rod assembly to the push rod 400. Accordingly, the insulation level of the push rod assembly provided by the embodiment of the present invention can be improved, thereby improving the safety performance.

[0050] In addition, since the second injection-molded part 300 can be molded later than the first injection-molded part 200, the other structural parts in the push rod assembly can be assembled based on the combined structure prepared by the previous injection molding process, so as to further reduce the injection molding difficulty of each structural part in the push rod assembly and improve the structural performance of the push rod assembly.

[0051] In one embodiment, the first injection molded part 200 further includes a body portion 210. Figure 5 and Figure 6 The main body 210 is provided with a through hole 211 , and the first injection molded part 200 is sleeved on the outside of the push rod 400 through the through hole 211 , so that one axial end of the push rod 400 is sleeved into the inside of the first injection molded part 200 .

[0052] Please continue to refer to Figure 5 and Figure 6 In the structure shown, the limiting portion 220 extends from one side of the main body 210 and abuts against the axial end surface of one side of the push rod 400 extending into the insulating seat.

[0053] It should be understood that the limiting portion 220 can extend from the main body 210 in any direction, as long as the limiting portion 220 is in contact with the axial end surface of the push rod 400 extending into the insulating seat.

[0054] Please refer to Figures 1 to 6 The push rod assembly provided in the embodiment of the present invention further includes an auxiliary movable spring 100 . At least a portion of the auxiliary movable spring 100 is enclosed in the first injection molded part 200 .

[0055] It should be noted that in the push rod assembly provided by the embodiment of the present invention, the first injection molded part 200 and the second injection molded part 300 can be assembled with the auxiliary movable spring 100 respectively. Specifically, the first injection molded part 200 can be first formed into one piece with the auxiliary movable spring 100. In the process of forming a combined structure between the auxiliary movable spring 100 and the first injection molded part 200, the size of the first injection molded part 200 in the thickness direction of the auxiliary movable spring 100 is smaller than the overall size of the insulating seat, which can reduce the pressure applied to the auxiliary movable spring 100, so as to weaken or even eliminate the possibility of deformation of the auxiliary movable spring 100, reduce the difficulty of injection molding, and improve the structural performance of the push rod assembly.

[0056] At the same time, since the second injection-molded part 300 can be molded later than the first injection-molded part 200, other structural parts in the push rod assembly can be assembled based on the combined structure prepared by the previous injection molding process, so as to further reduce the injection molding difficulty of each structural part in the push rod assembly and improve the structural performance of the push rod assembly.

[0057] It is worth noting that when arranging the second injection molded part 300 in the push rod assembly, there are many possibilities for the arrangement position of the second injection molded part 300 relative to the combined structure. In order to more clearly understand the push rod assembly provided by the embodiment of the present invention, Figure 1 In the exemplary configuration, the axial direction of the push rod 400 is parallel to the Z direction, the extending direction of the auxiliary movable spring 100 is parallel to the X direction, the X direction is perpendicular to the Z direction, and the thickness direction of the auxiliary movable spring 100 is parallel to the Z direction.

[0058] In one embodiment, please continue to refer to Figure 1 In the structure shown, along the thickness direction of the auxiliary movable spring 100 (which can be understood as the Z direction), the second injection molded part 300 covers at least a portion of each side of the first injection molded part 200 to thicken the thickness of both sides of the first injection molded part 200 along the Z direction, thereby improving the structural strength of the insulating seat finally prepared.

[0059] Furthermore, in the direction perpendicular to the Z direction, the second injection molded part 300 covers at least part of the side surface of the first injection molded part 200 to effectively wrap the first injection molded part 200 and improve the structural strength of the insulating seat. Specific configurations can be made according to requirements and will not be described in detail here.

[0060] like Figure 1 As shown, Figure 1 An exemplary configuration is as follows: along the extension direction of the auxiliary movable spring 100 , both side ends of the auxiliary movable spring 100 extend out from the first injection molded part 200 .

[0061] In this embodiment, the dimension of the first injection-molded part 200 in the thickness direction of the auxiliary movable spring 100 is smaller than the overall dimension of the insulating seat, which can reduce the pressure applied to the two side ends of the auxiliary movable spring 100 extending out of the first injection-molded part 200, so as to weaken or even eliminate the possibility of deformation of the auxiliary movable spring 100, reduce the difficulty of injection molding, and improve the structural performance of the push rod assembly.

[0062] It is worth noting that in the subsequent solutions, the push rod 400 and the auxiliary moving spring 100 are both fixed to the insulating seat. Of course, for the push rod assembly without the auxiliary moving spring 100, the push rod 400 and the insulating seat can also be arranged in the same way. Figures 2 to 4 Also shown is the Y direction, which is perpendicular to the X direction and the Z direction. Figure 3 and Figure 4As shown, the auxiliary spring 100 has a through hole 110; Figure 1 For reference Figure 2 and Figure 4 , the axis of the through hole 211 of the first injection molded part 200 is colinear with the axis of the through hole 110. It should be understood that Figure 2 and Figure 4 The first injection molded part 200 can be understood as including only the main body 210. Figure 2 and Figure 4 The first injection molded part 200 is shown with the main body 210 .

[0063] It should be noted that the structural arrangement in which the axis lines of the through hole 110 and the through hole 211 are colinear can facilitate the preparation operation of the through hole 211. In addition, since the through hole 110 and the through hole 211 are used to penetrate the push rod 400 in the subsequent assembly operation, the structural arrangement can also facilitate the subsequent assembly operation of the push rod 400.

[0064] When setting the sizes of the through hole 110 and the through hole 211 , it is preferably set that the diameter of the through hole 211 is larger than the diameter of the through hole 110 .

[0065] It should be noted that, in this embodiment, the diameter of the through hole 211 on the first injection molded part 200 is larger than the diameter of the through hole 110 on the auxiliary movable spring 100 , that is, the edge portion of the auxiliary movable spring 100 forming the through hole 110 is not covered by the first injection molded part 200 .

[0066] In one embodiment, Figure 3 As shown, the auxiliary movable spring 100 is provided with a positioning hole 120, and the positioning hole 120 is provided on at least one side of the through hole 110 along the radial direction of the through hole 110. This structural setting can prevent the auxiliary movable spring 100 from rotating in a plane perpendicular to the Z direction, so as to exert an anti-twist effect, improve the injection molding accuracy of the auxiliary movable spring 100 and the first injection molded part 200, and further improve the assembly accuracy of each structural component in the prepared push rod assembly, and improve the structural performance of the push rod assembly.

[0067] like Figure 2 and Figure 4 As shown, the first injection molded part 200 is provided with a positioning hole 212. Along the radial direction of the positioning hole 212, the positioning hole 212 is provided on at least one side of the through hole 211, and the axis of the positioning hole 212 is aligned with the axis of the through hole 211. Figure 3 The axis center lines of the positioning holes 120 are shown to be collinear.

[0068] It is worth noting that due to the presence of the positioning holes 120 and 212, when the first injection molded part 200 is injected onto the surface of the auxiliary spring 100, the combined structure after the initial injection molding has a hole structure penetrating along the Z direction. During the subsequent secondary injection molding, the hole structure can also play a positioning effect according to the needs.

[0069] In a specific embodiment, the diameter of the positioning hole 212 on the first injection molded part 200 is larger than the diameter of the positioning hole 120 on the auxiliary movable spring 100, that is, the edge of the auxiliary movable spring 100 forming the positioning hole 120 is not covered by the first injection molded part 200. The positioning hole 212 plays a positioning function in the X direction and the Y direction, thereby improving the injection molding accuracy of the auxiliary movable spring 100 and the first injection molded part 200, improving the assembly accuracy of various structural parts in the prepared push rod assembly, and improving the structural performance of the push rod assembly.

[0070] Please continue to refer to Figures 2 to 4 In the structure shown, the number of the positioning holes 120 on the auxiliary movable spring 100 can be two, and the two positioning holes 120 are arranged on opposite sides of the through hole 110, so as to effectively position the auxiliary movable spring 100 in the X direction and the Y direction, and better play the role of anti-twist. Correspondingly, each first injection molded part 200 is provided with a positioning hole 212 at the position corresponding to the positioning hole 120 of the auxiliary movable spring 100.

[0071] Of course, the number of the positioning holes 120 on the auxiliary movable spring 100 and the number of the positioning holes 212 on the first injection molded part 200 can also be set to other numbers according to needs. The specific number can be set according to needs and will not be repeated here.

[0072] When the position limiting portion 220 in this embodiment is specifically set, there are many possibilities for the setting form and setting position of the position limiting portion 220. Figure 5 In the structure shown, the limiting portion 220 connects two opposite sides of the main body 210 ; along the axial direction of the push rod 400 , the projection of the limiting portion 220 on the main body 210 covers the axial center line of the through hole 211 .

[0073] It should be noted that, in this embodiment, the limit portion 220 is connected to both sides of the main body 210, which can improve the structural strength of the entire limit portion 220, and can increase the contact area between the limit portion 220 and the push rod 400, thereby improving the stopping effect of the limit portion 220 on the push rod 400.

[0074] When preparing the first injection molded part 200, the limiting part 220 can be injection molded together with the main body 210. It should be understood that since the limiting part 220 is injection molded together with the main body 210, the structural strength of the first injection molded part 200 can be improved, thereby improving the limiting effect of the limiting part 220 on the push rod 400.

[0075] Of course, in the plane formed by the X direction and the Y direction, the limiting portion 220 can also be connected to only one side edge of the main body 210. Exemplarily, the structure of the limiting portion 220 can be as follows: Figure 6As shown, one end is connected to the main body 210, and the other end extends to the top of the through hole 211. That is, Figure 6 The middle limiting portion 220 is connected to the main body 210 at only one end, and the other end is suspended to form a cantilever structure. Alternatively, the limiting portion 220 may include multiple cantilever structures, and the multiple cantilever structures are arranged at intervals along the circumference of the through hole 211 to limit the push rod 400 through the multiple cantilever structures.

[0076] In a specific embodiment, please continue to refer to Figure 5 and Figure 6 In the structure shown, the limiting portion 220 connects the hole walls on both sides of the through hole 211. Exemplarily, along the Y direction, the limiting portion 220 connects the hole walls on both sides of the through hole 211.

[0077] It should be noted that the structural arrangement in this embodiment can facilitate the injection molding operation of the limiting portion 220 and the main body portion 210, so as to reduce the difficulty of manufacturing, improve the manufacturing efficiency and reduce the manufacturing cost.

[0078] In one embodiment, please continue to combine Figure 5 and Figure 6 refer to Figure 1 In the structure shown, at least a portion of the second injection molded part 300 is located between the peripheral side surface of the push rod 400 and the hole wall of the through hole 211 formed in the first injection molded part 200 .

[0079] It is worth noting that the push rod 400 is prepared synchronously with the second injection molded part 300, that is, after the first injection molded part 200 and the auxiliary dynamic spring 100 are prepared to form a combined structure, the assembly position of the push rod 400 in the combined structure can be set by tooling, and then the material is injected into the mold to form the second injection molded part 300.

[0080] It should be understood that after the second injection molded part 300 is injection molded, the push rod 400, the first injection molded part 200, the auxiliary movable spring 100 and the second injection molded part 300 form a whole. Therefore, in this embodiment, the push rod 400 is connected to the insulating seat and the auxiliary movable spring 100 by integral injection molding.

[0081] It should be noted that the assembly process of the push rod 400 is based on the combined structure formed by the auxiliary dynamic spring 100 and the first injection molded part 200, which can improve the assembly accuracy of the push rod 400, and then improve the assembly accuracy of each structural component in the prepared push rod assembly, as well as improve the structural performance of the push rod assembly.

[0082] In one embodiment, please combine Figures 2 to 6 The structure shown refers to Figures 7 to 10 In the structure shown, along the axial direction of the push rod 400, at least one side of the first injection molded part 200 is provided with a protrusion 230; Fig.10 As shown, the second injection molded part 300 partially covers the surface of the first injection molded part 200 ; and along the axial direction (ie, Z direction) of the push rod 400 , the surface of the protrusion 230 of the first injection molded part 200 is exposed on the surface of the second injection molded part 300 .

[0083] It should be noted that the protrusion 230 can play a positioning effect when injecting the second injection-molded part 300 to measure the injection amount of the second injection-molded part 300 along the Z direction, which can improve the preparation accuracy of the second injection-molded part 300 and the first injection-molded part 200, thereby improving the structural performance of the push rod assembly, and even improving the structural performance of the relay using the push rod assembly.

[0084] In specific configuration, it can be configured that: along the Z direction, only one side of the main body 210 is provided with the protruding portion 230 , or both sides of the main body 210 are provided with the protruding portion 230 .

[0085] When protrusions 230 are provided on both sides of the main body 210, the protrusion 230 on one side of the main body 210 positions the top surface of the second injection molded part 300, and the protrusion 230 on the other side of the main body 210 positions the bottom surface of the second injection molded part 300. The injection amount of the second injection molded part 300 along the Z direction can be measured from two directions, which can further improve the preparation effect of the second injection molded part 300 and the first injection molded part 200.

[0086] In one embodiment, there are multiple protrusions 230 on each side of the body 210, and the multiple protrusions 230 are arranged at intervals around the through hole 211. It should be understood that the multiple protrusions 230 can be arranged at uniform intervals or non-uniform intervals.

[0087] It should be noted that when there are multiple protrusions 230 on each side of the main body 210, the stability of the first injection molded part 200 after being placed in the second mold can be improved to improve the secondary injection molding effect. At the same time, multiple protrusions 230 can also improve the morphology of the separation interface between the first injection molded part 200 and the second injection molded part 300, avoiding the first injection molded part 200 and the second injection molded part 300 being a purely horizontal separation surface at the injection position, thereby improving the connection effect between the second injection molded part 300 and the first injection molded part 200.

[0088] In one embodiment, please continue to refer to Figures 7 to 10 As shown in the structure, the push rod assembly provided in the embodiment of the present invention also includes a metal bracket 500, which includes a base plate 510. The base plate 510 is at least partially wrapped in the second injection molded part 300, and along the Z direction, the base plate 510 abuts against the surface of the protrusion 230 of the second injection molded part 300 exposed on the side away from the push rod 400.

[0089] It should be noted that when the first injection molded part 200 is provided with a protrusion 230, the protrusion 230 can limit the assembly position of the metal bracket 500 in the direction Z, so as to reduce the number of tools, simplify the mold design, and reduce the assembly difficulty and improve the assembly efficiency. At the same time, since the assembly position of the metal bracket 500 can be limited by the protrusion 230, the assembly accuracy of each structural member in the push rod assembly can be improved, so as to improve the structural performance of the push rod assembly.

[0090] Accordingly, the insulation level of the push rod assembly provided by the embodiment of the present invention can be improved, thereby improving the safety performance.

[0091] like Figure 8 As shown, the bottom plate 510 has a through hole, and the bottom plate 510 is sleeved on the outside of the push rod 400 through the through hole, so that the push rod 400 is arranged in the insulating seat.

[0092] In one embodiment, please combine Figures 7 to 10 refer to Fig.11 In the structure shown, the metal bracket 500 also includes a side plate 520 and a top plate 530, the side plate 520 is connected to the bottom plate 510, and the two side plates 520 are located on the same side of the bottom plate 510; the top plate 530 is installed on one end of the two side plates 520 away from the insulating seat, and the top plate 530 is connected to each side plate 520.

[0093] In a specific embodiment, please continue to combine Figures 7 to 10 refer to Fig.11 In the structure shown, each side plate 520 is provided with a through hole on the side away from the insulating seat. Along the Y direction, each side end of the top plate 530 is inserted into the through hole to achieve the connection and fixation between the top plate 530 and the metal bracket 500.

[0094] Of course, it can also be arranged that after the top plate 530 is installed with the metal bracket 500 through the through hole, the two are fixed by riveting to further enhance the structural stability.

[0095] In one embodiment, the metal bracket 500 is connected to the insulating seat, the push rod 400 and the auxiliary reed 100 by integral injection molding to improve the structural stability between the two. At the same time, this structural setting can also reduce the number of isolated structural parts in the relay, simplify the injection molding difficulty, and improve assembly efficiency.

[0096] In addition, please continue to refer to Figures 7 to 10 In the structure shown, the surface of the insulating seat may be provided with other grooves or retaining wall structures, which can be simultaneously injection molded with the second injection molded part 300 to play a corresponding role. Figure 7As shown, along the Z direction, the second injection molded part 300 is provided with an isolation groove on the side facing the push rod 400, and the isolation groove can be used to extend the creepage path from the metal bracket 500 or the elastic member 600 to the push rod 400; along the Z direction, the second injection molded part 300 is provided with a retaining wall or a groove on the side facing away from the push rod 400, and the groove can be used to extend the creepage path from the metal bracket 500 or the elastic member 600 to the auxiliary moving spring 100.

[0097] In addition, the surface of the insulating seat may be provided with an assembly groove to limit the elastic member 600, or the surface of the insulating seat may be provided with a protrusion structure to extend into the hollow area of ​​the contact spring to assist in limiting the elastic member 600, which will not be described in detail.

[0098] In a second aspect, an embodiment of the present invention further provides a relay. Figures 1 to 10 refer to Fig.11 In the structure shown, the relay provided by the embodiment of the present invention includes a push rod assembly provided by any technical solution in the above-mentioned first aspect.

[0099] It should be noted that, in the relay provided in the embodiment of the present invention, the first injection molded part 200 and the second injection molded part 300 form an insulating seat, and the first injection molded part 200 and the second injection molded part 300 can be assembled with the push rod 400 respectively. Specifically, the limiting portion 220 is equivalent to a stop structure, which can limit the maximum displacement of the push rod 400 along one side of the axial direction. On the side where the limiting portion 220 is provided, there is no need for tooling to support the push rod 400 from the top opening of the push rod 400 for positioning, which is convenient for simplifying the preparation of tooling, reducing the difficulty of preparation and improving the efficiency of preparation. Accordingly, in this embodiment, the structural setting of the limiting portion 220 can save the number of assembly tooling, simplify the mold, and reduce the difficulty of assembly and improve the efficiency of assembly.

[0100] At the same time, when the limiting portion 220 is used to limit the axial end of the push rod 400, it is possible to avoid leaving a small hole in the second injection molded part 300 at the top tooling position corresponding to the push rod 400, thereby eliminating the situation where the small hole causes the reduction of the creepage distance from other metal structural parts in the push rod assembly to the push rod 400. Accordingly, the insulation level of the push rod assembly provided by the embodiment of the present invention can be improved, thereby improving the safety performance.

[0101] In addition, since the second injection-molded part 300 can be molded later than the first injection-molded part 200, the other structural parts in the push rod assembly can be assembled based on the combined structure prepared by the previous injection molding process, so as to further reduce the difficulty of injection molding of the various structural parts in the push rod assembly and improve the structural performance of the push rod assembly and even the relay.

[0102] In one embodiment, please continue to refer to Fig.11In the structure shown, the relay provided by the embodiment of the present invention further includes a moving reed 700, which is placed in the space formed by the top plate 530 and the two side plates 520 in the push rod assembly, and the surface of the moving reed 700 facing the insulating seat is connected to the elastic member 600, and the surface of the moving reed 700 facing away from the insulating seat is connected to the magnetic conductor fixed on the inner surface of the top plate 530. It should be understood that the magnetic conductor can enhance the short-circuit resistance of the relay.

[0103] It should be noted that, in this embodiment, the movable spring 700 is used to contact the static contact in the static contact assembly, and the movable spring 700 is installed in the space formed by the metal bracket 500 in the push rod assembly. When the movable spring 700 moves along the Z direction, the auxiliary movable spring 100 moves synchronously with the movable spring 700.

[0104] It is worth noting that the relay provided in the embodiment of the present invention also includes a magnetic circuit assembly, which drives the spring 700 to contact and disengage with the static contact through the push rod assembly. Specifically, when the coil in the magnetic circuit assembly is connected to the current, when the moving iron core in the magnetic circuit assembly moves upward along the Z direction, the moving iron core drives the push rod assembly to move upward, so that the moving contacts at both ends of the moving spring 700 are in contact with the two static contacts respectively; when the coil disconnects the current, the moving iron core in the magnetic circuit assembly moves downward along the Z direction under the action of the reset spring, and the moving iron core drives the push rod assembly to move downward, so that the moving contacts at both ends of the moving spring 700 are separated from the two static contacts respectively. It should be understood that the above reset spring is a spring between the moving iron core and the static iron core.

[0105] Please continue to refer to Fig.11 In the structure shown, the relay provided by the embodiment of the present invention further includes an auxiliary contact lead-out terminal 800. When the moving spring 700 moves along the Z direction, the auxiliary moving spring 100 moves with the moving spring 700; when the moving contact on the moving spring 700 contacts the static contact, the auxiliary moving contact on the auxiliary moving spring 100 contacts the auxiliary contact lead-out terminal 800; conversely, when the moving contact on the moving spring 700 is separated from the static contact, the auxiliary moving contact on the auxiliary moving spring 100 is separated from the auxiliary contact lead-out terminal 800.

[0106] It is worth noting that the auxiliary moving spring 100 is used to monitor the contact and disengagement state between the moving contact and the static contact. The contact and disengagement between the auxiliary moving contact and the auxiliary contact lead-out terminal 800 are further explained. When the two ends of the auxiliary moving spring 100 move to the moment of combining with the auxiliary contact lead-out terminal 800, the auxiliary contact lead-out terminal 800 in the detection circuit is connected, so that the detection main contact (i.e., the moving contact and the static contact) is connected; on the contrary, when the high-voltage DC relay control coil stops being energized, the moving iron core moves in the opposite direction of the attraction under the elastic force of the reset spring, and the auxiliary moving spring 100 moves away from the auxiliary contact lead-out terminal 800 as the moving iron core is reset. When the two ends of the auxiliary moving spring 100 are separated from the auxiliary contact lead-out terminal 800, the high-voltage DC relay detection circuit is disconnected, and the detection of the separation of the main contact (i.e., the moving contact and the static contact) is realized.

[0107] In a third aspect, an embodiment of the present invention further provides a method for preparing a push rod assembly. Fig.12 The flowchart of the method for preparing the push rod assembly provided by the embodiment of the present invention is shown. Figures 1 to 11 For reference Fig.12 , the preparation method comprises:

[0108] Step S1202: Exemplarily, Figure 8 As shown, a push rod 400 and a first injection molded part 200 are provided, and an axial end surface of one side of the push rod 400 is abutted against the limiting portion 220 of the first injection molded part 200, so that the push rod 400 and the first injection molded part 200 are assembled in place;

[0109] Step S1204: Form a second injection molded part 300 on the surface of the first injection molded part 200 through an injection molding process, so that the second injection molded part 300 partially covers the surface of the first injection molded part 200 and cooperates with the first injection molded part 200 to form an insulating seat, so as to Figure 8 The first injection molded part 200 and the second injection molded part 300 are formed as shown in FIG. Fig. 9 The structure shown.

[0110] Specifically, the method for preparing the push rod assembly provided in the embodiment of the present invention divides the preparation of the insulating seat into two processes, and two injection molding processes can be performed. First, when executing step S1202, the first injection molded part 200 can be formed by the injection molding process, and the limiting part 220 on the first injection molded part 200 is used to limit the axial end face of the push rod 400. After that, step S1204 is performed to form the second injection molded part 300 on the surface of the first injection molded part 200, and the first injection molded part 200 and the push rod 400 are fixed by the second injection molded part 300.

[0111] It should be noted that in the preparation method of the push rod assembly provided in the embodiment of the present invention, the first injection molded part 200 and the second injection molded part 300 form an insulating seat, and the first injection molded part 200 and the second injection molded part 300 can be assembled with the push rod 400 respectively. Specifically, the limiting portion 220 is equivalent to a stop structure, which can limit the maximum displacement of the push rod 400 along one side of the axial direction. On the side where the limiting portion 220 is provided, there is no need for tooling to support the push rod 400 from the top opening of the push rod 400 for positioning, which is convenient for simplifying the preparation tooling, reducing the difficulty of preparation and improving the preparation efficiency. Accordingly, in this embodiment, the structural setting of the limiting portion 220 can save the number of assembly tooling, simplify the mold, and reduce the difficulty of assembly and improve the assembly efficiency.

[0112] At the same time, when the limiting portion 220 is used to limit the axial end of the push rod 400, it is possible to avoid leaving a small hole in the second injection molded part 300 at the top tooling position corresponding to the push rod 400, thereby eliminating the situation where the small hole causes the reduction of the creepage distance from other metal structural parts in the push rod assembly to the push rod 400. Accordingly, the insulation level of the push rod assembly provided by the embodiment of the present invention can be improved, thereby improving the safety performance.

[0113] In addition, since the second injection-molded part 300 can be molded later than the first injection-molded part 200, the other structural parts in the push rod assembly can be assembled based on the combined structure prepared by the previous injection molding process, so as to further reduce the difficulty of injection molding of the various structural parts in the push rod assembly and improve the structural performance of the push rod assembly and even the relay.

[0114] Of course, the preparation method of the push rod assembly can also be used to prepare a push rod assembly as provided by any technical solution in the first aspect, and the details will not be repeated here.

[0115] In one embodiment, step S1204 is performed, and after the second injection molded part 300 is formed on the surface of the first injection molded part 200 through the injection molding process, at least a portion of the second injection molded part 300 is located between the peripheral surface of the push rod 400 and the first injection molded part 200 to enhance the fixing strength between the push rod 400 and the insulating seat.

[0116] In one embodiment, step S1204 is performed, and the preparation method of forming the second injection molded part 300 on the surface of the first injection molded part 200 by the injection molding process again further includes:

[0117] A metal bracket 500 is provided, and a bottom plate 510 of the metal bracket 500 is brought into contact with a surface of a side of the protrusion 230 of the first injection molded part 200 that is away from the push rod 400;

[0118] Through the injection molding process, the second injection molded part 300 is formed on the surface of the first injection molded part 200 after the metal bracket 500 is assembled, so that the second injection molded part 300 is partially covered on the surface of the first injection molded part 200, and at least a part of the control base plate 510 is wrapped in the second injection molded part 300.

[0119] It should be noted that when the first injection molded part 200 is provided with a protrusion 230, the protrusion 230 can limit the assembly position of the metal bracket 500 in the direction Z, so as to reduce the number of tools, simplify the mold design, and reduce the assembly difficulty and improve the assembly efficiency. At the same time, since the assembly position of the metal bracket 500 can be limited by the protrusion 230, the assembly accuracy of each structural member in the push rod assembly can be improved, so as to improve the structural performance of the push rod assembly.

[0120] Accordingly, the insulation level of the prepared push rod assembly can be improved, thereby improving the safety performance.

[0121] Finally, it should be noted that: it is understandable that the various embodiments / implementations provided by the present invention can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0122] In the embodiments of the invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the invention can be understood according to the specific circumstances.

[0123] In the description of the embodiments of the invention, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the embodiments of the invention.

[0124] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the invention embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0125] The above are only preferred embodiments of the invention embodiments, and are not intended to limit the invention embodiments. For those skilled in the art, the invention embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the invention embodiments shall be included in the protection scope of the invention embodiments.

Claims

1. A push rod assembly, characterized in that: include: A push rod, a first injection-molded part and a second injection-molded part, wherein the second injection-molded part covers at least a portion of the first injection-molded part, and the second injection-molded part cooperates with the first injection-molded part to form an insulating seat; the first injection-molded part includes a limiting portion, and the limiting portion abuts against an axial end face of one side of the push rod extending into the insulating seat.

2. The push rod assembly according to claim 1, characterized in that: The first injection molded part also includes a main body, which is provided with a through hole, and the first injection molded part is sleeved on the outside of the push rod through the through hole; the limiting part extends from one side of the main body and abuts against the axial end face of the push rod extending into the insulating seat.

3. The push rod assembly according to claim 2, characterized in that: Along the axial direction of the push rod, at least a portion of the projection of the limiting portion on the main body is located in the through hole, and the limiting portion abuts against an axial end surface of one side of the push rod extending into the through hole.

4. The push rod assembly according to claim 3, characterized in that: The limiting portion connects two opposite sides of the main body; along the axial direction of the push rod, the projection of the limiting portion on the main body covers the axial center line of the through hole.

5. The push rod assembly according to claim 4, characterized in that: The limiting portion is connected to the hole walls on two opposite sides of the through hole.

6. The push rod assembly according to any one of claims 2 to 5, characterized in that: At least a portion of the second injection molded part is located between the peripheral side surface of the push rod and the hole wall of the first injection molded part forming the through hole.

7. The push rod assembly according to any one of claims 2 to 5, characterized in that: The first injection molded part is provided with a positioning hole, and along the radial direction of the positioning hole, the positioning hole is provided on at least one side of the through hole.

8. The push rod assembly according to any one of claims 2 to 5, characterized in that: The first injection molded part also includes a protrusion, and along the axial direction of the push rod, at least one side of the main body is provided with a protrusion; the second injection molded part is partially covered on the surface of the first injection molded part, and along the axial direction of the push rod, the surface of the protrusion is exposed to the surface of the second injection molded part.

9. The push rod assembly according to claim 8, characterized in that: There are multiple protrusions, and the multiple protrusions are arranged at intervals around the axis of the push rod.

10. The push rod assembly according to claim 8, characterized in that It also includes a metal bracket, which includes a bottom plate, at least part of which is wrapped in the second injection molded part; along the axial direction of the push rod, the bottom plate abuts against the surface of the protrusion of the second injection molded part exposed on the side away from the push rod.

11. The push rod assembly according to claim 10, characterized in that: The metal bracket also includes a top plate and a side plate, the side plate is connected to the bottom plate, and the two side plates are located on the same side of the bottom plate; the top plate is installed on one end of the two side plates away from the insulating seat, and the top plate is connected to each of the side plates.

12. The push rod assembly according to claim 10, characterized in that The metal bracket is connected to the insulating seat and the pushing rod by integral injection molding.

13. The push rod assembly according to any one of claims 1 to 5, characterized in that: The push rod is connected to the insulating seat by integral injection molding.

14. A relay, characterized in that: A push rod assembly comprising any one of claims 1-13.

15. A method for preparing a push rod assembly, characterized in that: include: Provide a push rod and a first injection molded part, and abut one side axial end surface of the push rod against the limiting portion of the first injection molded part so that the push rod and the first injection molded part are assembled in place; Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part, so that the second injection molded part partially covers the surface of the first injection molded part and cooperates with the first injection molded part to form an insulating seat.

16. The method for preparing a push rod assembly according to claim 15, characterized in that: After the second injection-molded part is formed on the surface of the first injection-molded part through the injection molding process, at least a portion of the second injection-molded part is located between the peripheral side surface of the push rod and the first injection-molded part.

17. The method for preparing a push rod assembly according to claim 15 or 16, characterized in that: The preparation method of forming the second injection molded part on the surface of the first injection molded part through the injection molding process also includes: Providing a metal bracket, and making the bottom plate of the metal bracket abut against the surface of one side of the protrusion of the first injection molded part facing away from the push rod; Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part after assembling the metal bracket, so that the second injection molded part is partially covered on the surface of the first injection molded part, and at least a part of the base plate is controlled to be covered in the second injection molded part.

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