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 an auxiliary movable contact spring, a first injection molding piece and a second injection molding piece, and at least part of the auxiliary movable contact spring is wrapped in the first injection molding piece; 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 push rod assembly can improve the injection molding precision of all structural parts in the push rod assembly so as to 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, in which various structural parts such as an auxiliary moving spring are assembled on an insulating seat. It is worth noting that when forming the push rod assembly, the assembly position of each structural part in the insulating seat is difficult to control, and it is difficult to ensure the accuracy of assembly.

[0004] For example, taking the auxiliary movable spring as an example, along the thickness direction of the auxiliary movable spring, the auxiliary movable spring is suspended in the insulating seat. During assembly, it is difficult to effectively locate the assembly position of the auxiliary movable spring and the insulating seat. If the auxiliary movable spring is positioned by extending the insulating seat, since the insulating seat is molded by one-time injection molding, the force applied to both sides of the auxiliary movable spring can easily bend the auxiliary movable spring, thereby affecting the auxiliary movable spring and even the structural performance of the relay. 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 to improve the structural performance of the push rod assembly.

[0006] An embodiment of the present invention provides a push rod assembly, comprising: an auxiliary movable spring, a first injection-molded part and a second injection-molded part, wherein at least a portion of the auxiliary movable spring is enclosed in the first injection-molded part; 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.

[0007] According to some embodiments of the present invention, along the thickness direction of the auxiliary movable spring, the second injection molded part covers at least a portion of each side of the first injection molded part.

[0008] According to some embodiments of the present invention, along the extension direction of the auxiliary movable spring, both side ends of the auxiliary movable spring extend out from the first injection molded part.

[0009] According to some embodiments of the present invention, a push rod is further included, and the first injection molded part includes a main body and a limiting portion, the limiting portion extends from one side of the main body, and the limiting portion abuts against an axial end face of one side of the push rod extending into the insulating seat.

[0010] According to some embodiments of the present invention, the auxiliary movable spring has a first through hole, the first injection-molded part has a second through hole, and the axis of the second through hole is colinear with the axis of the first through hole.

[0011] According to some embodiments of the present invention, the second through hole is provided in the main body; along the axial direction of the push rod, at least part of the projection of the auxiliary movable spring of the limiting portion is located in the first through hole, and the limiting portion abuts against the axial end face of one side of the push rod extending into the first through hole.

[0012] According to some embodiments of the present invention, the auxiliary movable spring is provided with a first positioning hole, and along the radial direction of the first through hole, the first positioning hole is provided on at least one side of the first through hole;

[0013] The first injection molded part is provided with a second positioning hole. Along the radial direction of the second positioning hole, the second positioning hole is provided on at least one side of the second through hole, and the axis of the second positioning hole is colinear with the axis of the first positioning hole.

[0014] According to some embodiments of the present invention, the diameter of the second through hole is greater than the diameter of the first through hole, and / or the diameter of the second positioning hole is greater than the diameter of the first positioning hole.

[0015] According to some embodiments of the present invention, the auxiliary movable spring is sleeved on the outside of the push rod through the first through hole, and 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 second through hole.

[0016] 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 first through hole.

[0017] According to some embodiments of the present invention, the limiting portion is connected to two opposite side hole walls of the second through hole.

[0018] According to some embodiments of the present invention, a protrusion is provided on at least one side of the first injection-molded part along the axial direction of the push rod; 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 on the surface of the second injection-molded part.

[0019] 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.

[0020] According to some embodiments of the present invention, the push rod is connected to the insulating seat and the auxiliary movable spring by integral injection molding.

[0021] 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.

[0022] According to some embodiments of the present invention, it 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.

[0023] According to some embodiments of the present invention, the metal bracket is connected to the insulating seat, the push rod and the auxiliary movable spring by integral injection molding.

[0024] An embodiment of the present invention further provides a relay, comprising a push rod assembly as provided by any of the above technical solutions.

[0025] An embodiment of the present invention further provides a method for preparing a push rod assembly, comprising:

[0026] By means of an injection molding process, a first injection molded part is formed on the surface of the auxiliary movable spring piece, so that the first injection molded part covers at least a portion of the auxiliary movable spring piece;

[0027] The second injection molded part is formed on the surface of the first injection molded part through the injection molding process again, 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.

[0028] According to some embodiments of the present invention, a method for preparing a second injection molded part by injection molding again on the surface of the first injection molded part includes:

[0029] Providing a push rod, and inserting the push rod axially into the first through hole of the auxiliary movable spring until one axial end surface of the push rod abuts against the limiting portion of the first injection molded part;

[0030] Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part after the push rod is assembled, so that at least a part of the second injection molded part is located between the peripheral side surface of the push rod and the first injection molded part.

[0031] According to some embodiments of the present invention, the preparation method of forming a second injection molded part on the surface of the first injection molded part by the injection molding process again further includes:

[0032] 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;

[0033] 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.

[0034] An embodiment of the above invention has at least the following advantages or beneficial effects:

[0035] 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 auxiliary movable spring respectively. Specifically, the first injection molded part can be integrated with the auxiliary movable spring first. In the process of forming a combined structure of the auxiliary movable spring and the first injection molded part, the size of the first injection molded part in the thickness direction of the auxiliary movable spring is smaller than the overall size of the insulating seat, which can reduce the pressure applied to the auxiliary movable spring, so as to weaken or even eliminate the possibility of deformation of the auxiliary movable spring, reduce the difficulty of injection molding, and improve the structural performance of the push rod assembly.

[0036] At the same time, 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

[0037] 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;

[0038] 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;

[0039] 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;

[0040] Figure 4 It shows Figure 2 A cross-sectional view of the structure;

[0041] 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;

[0042] Figure 6 It shows Figure 5 A cross-sectional view of the structure;

[0043] Figure 7 What is shown is a schematic structural diagram of a push rod assembly in an embodiment of the present invention;

[0044] Figure 8 It shows Figure 7 Exploded schematic diagram of the structure;

[0045] Fig. 9 It shows Figure 7 Schematic diagram of the structure at another angle

[0046] Fig.10 It shows Fig. 9 A cross-sectional view of the structure;

[0047] Fig.11 It shows Fig.10 Cross-sectional view of the structure when applied to a relay;

[0048] Fig.12 Shown is a flow chart of a method for preparing a push rod assembly provided by an embodiment of the present invention.

[0049] The following are the descriptions of the reference numerals:

[0050] 100, auxiliary moving spring; 110, first through hole; 120, first positioning hole; 200, first injection molded part; 210, main body; 211, second through hole; 212, second 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 member; 700, moving spring; 800, auxiliary contact lead-out terminal. DETAILED DESCRIPTION

[0051] 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.

[0052] In a first aspect, an embodiment of the present invention provides a push rod assembly. Figure 1 The structure of the push rod assembly provided by the embodiment of the present invention is shown in FIG. Figure 1As shown in the structure, the push rod assembly provided by the embodiment of the present invention includes: an auxiliary movable spring 100, a first injection molded part 200 and a second injection molded part 300, wherein at least a portion of the auxiliary movable spring 100 is enclosed in the first injection molded part 200; 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.

[0053] It should be understood that Figure 1 The structure of the auxiliary movable spring 100, 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.

[0054] 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 form an insulating seat, and 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 integrated with the auxiliary movable spring 100 first. In the process of forming a combined structure of 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.

[0055] 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.

[0056] 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. Figure 1 As shown, the push rod assembly provided in this embodiment further includes a push rod 400. 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.

[0057] In one embodiment, please continue to refer to Figure 1In 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.

[0058] 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.

[0059] 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 .

[0060] 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.

[0061] Figure 2 The figure shows a first structural schematic diagram of the auxiliary movable spring 100 and the first injection molded part 200 in the push rod assembly provided by the embodiment of the present invention after being assembled; Figure 3 The figure shows a schematic structural diagram of an auxiliary movable spring 100 in a push rod assembly provided by an embodiment of the present invention; Figure 4 It shows Figure 2 It should be understood that 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 4 As shown, the auxiliary spring 100 has a first through hole 110; Figure 1 For reference Figure 2 and Figure 4 The first injection molded part 200 has a second through hole 211, and the axis of the second through hole 211 is colinear with the axis of the first 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 .

[0062] It should be noted that the structural setting that the axis lines of the first through hole 110 and the second through hole 211 are colinear can facilitate the preparation operation of the second through hole 211. In addition, since the first through hole 110 and the second through hole 211 are used to penetrate the push rod 400 in the subsequent assembly operation, the structural setting can also facilitate the subsequent assembly operation of the push rod 400.

[0063] When setting the sizes of the first through hole 110 and the second through hole 211 , it is preferably set that the diameter of the second through hole 211 is larger than the diameter of the first through hole 110 .

[0064] It should be noted that, in this embodiment, the diameter of the second through hole 211 on the first injection molded part 200 is larger than the diameter of the first through hole 110 on the auxiliary movable spring 100 , that is, the edge portion of the auxiliary movable spring 100 forming the first through hole 110 is not covered by the first injection molded part 200 .

[0065] In one embodiment, Figure 3 As shown, the auxiliary movable spring 100 is provided with a first positioning hole 120, and along the radial direction of the first through hole 110, the first positioning hole 120 is provided on at least one side of the first 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.

[0066] like Figure 2 and Figure 4 As shown, the first injection molded part 200 is provided with a second positioning hole 212. Along the radial direction of the second positioning hole 212, the second positioning hole 212 is provided on at least one side of the second through hole 211, and the axis of the second positioning hole 212 is aligned with the axis of the second through hole 211. Figure 3 The axis center lines of the first positioning holes 120 are shown to be collinear.

[0067] It is worth noting that due to the existence of the first positioning hole 120 and the second positioning hole 212, when the first injection molded part 200 is injected onto the surface of the auxiliary dynamic 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.

[0068] In a specific embodiment, the diameter of the second positioning hole 212 on the first injection molded part 200 is larger than the diameter of the first positioning hole 120 on the auxiliary movable spring 100, that is, the edge of the auxiliary movable spring 100 forming the first positioning hole 120 is not covered by the first injection molded part 200. The second 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.

[0069] Please continue to refer to Figures 2 to 4 In the structure shown, the number of the first positioning holes 120 on the auxiliary movable spring 100 can be two, and the two first positioning holes 120 are arranged on opposite sides of the first 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 second positioning hole 212 at the position corresponding to the first positioning hole 120 of the auxiliary movable spring 100.

[0070] Of course, the number of the first positioning holes 120 on the auxiliary movable spring 100 and the second positioning holes 212 on the first injection molded part 200 can also be set to other numbers according to needs, and the specific number can be set according to needs, which will not be repeated here.

[0071] In one embodiment, please refer to Figure 5 and Figure 6 In the structure shown, the first injection molded part 200 includes a main body 210 and a limiting part 220. The limiting part 220 extends from one side of the main body 210, and the limiting part 220 abuts against the axial end face of the push rod 400 extending into the insulating seat. It should be understood that the limiting part 220 can extend from the main body 210 in any direction, as long as the limiting part 220 abuts against the axial end face of the push rod 400 extending into the insulating seat.

[0072] It should be noted that, in this embodiment, the limiting portion 220 is equivalent to a stop structure, which can limit the maximum displacement of the push rod 400 on one side along the axial direction. The limiting portion 220 is provided on one side of the main body 210, and there is no need for tooling to open a hole at the top of the push rod 400 to support the push rod 400 for positioning. The structural setting in this embodiment can avoid the second injection molded part 300 leaving a small hole at the tooling position corresponding to the top of the push rod 400, 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 400 to be reduced. Accordingly, the insulation level of the push rod assembly provided in the embodiment of the present invention can be improved, thereby improving the safety performance.

[0073] In general, in this embodiment, the structural setting of the limiter 220 can save the number of assembly tools, simplify the mold, reduce the difficulty of assembly, and improve the assembly efficiency. At the same time, the structural setting of the limiter 220 can extend the creepage distance from other metal structural parts in the prepared push rod assembly to the push rod 400, thereby improving the insulation level of the push rod assembly and improving the safety performance.

[0074] 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 first through hole 110 .

[0075] 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.

[0076] 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.

[0077] 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 6 As shown, one end is connected to the main body 210, and the other end extends to above the second through hole 211. That is, Figure 6 Only one end of the middle limiting portion 220 is connected to the main body 210, 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 second through hole 211 to limit the push rod 400 through the multiple cantilever structures.

[0078] In a specific embodiment, please continue to refer to Figure 5 and Figure 6 In the structure shown, the limiting portion 220 is connected to the hole walls on both sides of the second through hole 211. Exemplarily, along the Y direction, the limiting portion 220 is connected to the hole walls on both sides of the second through hole 211.

[0079] 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.

[0080] In one embodiment, please continue to combine Figure 5 and Figure 6 refer to Figure 1 In the structure shown, the auxiliary movable spring 100 is sleeved on the outside of the push rod 400 through the first through hole 110, and at least part 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 second through hole 211 formed by the first injection molded part 200.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 .

[0085] 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.

[0086] 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 .

[0087] 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.

[0088] 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 second through hole 211. It should be understood that the multiple protrusions 230 can be arranged at uniform intervals or at non-uniform intervals.

[0089] 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.

[0090] 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.

[0091] 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 Z direction, 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 7 As 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.

[0099] 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.

[0100] 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.

[0101] It should be noted that in the relay provided by the embodiment of the present invention, the first injection molded part 200 and the second injection molded part 300 in the push rod assembly form an insulating seat, and the first injection molded part 200 and the second injection molded part 300 can be assembled with the auxiliary moving spring 100 respectively. Specifically, the first injection molded part 200 can be integrated with the auxiliary moving spring 100 first. In the process of forming a combined structure between the auxiliary moving 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 moving spring 100 is smaller than the overall size of the insulating seat, which can reduce the pressure applied to the two side ends of the auxiliary moving 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 moving spring 100, reduce the difficulty of injection molding, and improve the push rod assembly and even the structural performance of the relay.

[0102] 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 and even the relay.

[0103] In one embodiment, please continue to refer to Fig.11 In 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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:

[0109] Step S1202: Form a first injection molded part 200 on the surface of the auxiliary movable spring 100 by injection molding, so that the first injection molded part 200 covers at least a portion of the auxiliary movable spring 100. For example, Figure 8 As shown;

[0110] Step S1204: Form a second injection molded part 300 on the surface of the first injection molded part 200 through the injection molding process again, 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 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.

[0111] Specifically, the method for preparing the push rod assembly provided by the embodiment of the present invention divides the preparation of the insulating seat into two processes, and performs two injection molding processes in total. First, when executing step S1202, a first injection molding part 200 is formed on the surface of the first auxiliary movable spring 100 by the injection molding process, and then step S1204 is performed to form a second injection molding part 300 on the surface of the first injection molding part 200.

[0112] It should be noted that in the preparation method of the push rod assembly provided by the embodiment of the present invention, the first injection molded part 200 can be first formed into an integral body with the auxiliary movable spring 100. During the process of the auxiliary movable spring 100 and the first injection molded part 200 forming a combined structure, 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 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 and improve the structural performance of the push rod assembly.

[0113] 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.

[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 to form the second injection molded part 300 on the surface of the first injection molded part 200 through the injection molding process again. The preparation method includes:

[0116] Provide a push rod 400, and insert the push rod 400 into the first through hole 110 of the auxiliary movable spring 100 along the axial direction until one axial end surface of the push rod 400 abuts against the limiting portion 220 of the first injection molded part 200;

[0117] 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 push rod 400 is assembled, so that 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 first injection molded part 200 .

[0118] It should be understood that the limiting portion 220 in this embodiment 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 on the body 210, there is no need for tooling to open a hole at the top of the push rod 400 to support the push rod 400 for positioning.

[0119] It should be noted that the structural setting in this embodiment can avoid leaving a small hole in the second injection molded part 300 at the tooling position corresponding to the top of the push rod 400, thereby eliminating the situation where the small hole causes a reduction in 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 in the embodiment of the present invention can be improved, thereby improving safety performance.

[0120] In addition, it should be noted that, in this embodiment, the assembly process of the push rod 400 is based on the combined structure after the auxiliary dynamic spring 100 and the first injection molded part 200 are prepared and formed, 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, and improve the structural performance of the push rod assembly.

[0121] 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:

[0122] 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;

[0123] 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.

[0124] 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 Z direction, 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.

[0125] Accordingly, the insulation level of the prepared push rod assembly can be improved, thereby improving the safety performance.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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: An auxiliary movable spring, a first injection molded part, and a second injection molded part, wherein at least a portion of the auxiliary movable spring is covered in the first injection molded part; 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.

2. The push rod assembly according to claim 1, characterized in that: Along the thickness direction of the auxiliary movable spring, the second injection molded part covers at least a portion of each side of the first injection molded part.

3. The push rod assembly according to claim 1, characterized in that: Along the extending direction of the auxiliary movable spring, both side ends of the auxiliary movable spring extend out from the first injection molded part.

4. The push rod assembly according to any one of claims 1 to 3, characterized in that: It also includes a push rod. The first injection molded part includes a main body and a limiting part. The limiting part extends from one side of the main body, and the limiting part abuts against an axial end face of the push rod extending into the insulating seat.

5. The push rod assembly according to claim 4, characterized in that: The auxiliary movable spring has a first through hole, the first injection molded part has a second through hole, and the axis of the second through hole is colinear with the axis of the first through hole.

6. The push rod assembly according to claim 5, characterized in that: The second through hole is arranged in the main body; along the axial direction of the push rod, at least part of the projection of the auxiliary movable spring of the limiting portion is located in the first through hole, and the limiting portion abuts against the axial end face of one side of the push rod extending into the first through hole.

7. The push rod assembly according to claim 5, characterized in that: The auxiliary movable spring is provided with a first positioning hole, and along the radial direction of the first through hole, the first positioning hole is provided on at least one side of the first through hole; The first injection molded part is provided with a second positioning hole. Along the radial direction of the second positioning hole, the second positioning hole is provided on at least one side of the second through hole, and the axis of the second positioning hole is colinear with the axis of the first positioning hole.

8. The push rod assembly according to claim 7, characterized in that: The diameter of the second through hole is greater than the diameter of the first through hole, and / or the diameter of the second positioning hole is greater than the diameter of the first positioning hole.

9. The push rod assembly according to claim 5, characterized in that: The auxiliary movable spring is sleeved on the outside of the push rod through the first through hole, and 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 second through hole.

10. The push rod assembly according to claim 5, characterized in that: The limiting portion is connected to 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 first through hole.

11. The push rod assembly according to claim 10, characterized in that: The limiting portion is connected to two opposite side hole walls of the second through hole.

12. The push rod assembly according to claim 4, characterized in that At least one side of the first injection molded part is provided with a protrusion along the axial direction of the push rod; 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 on the surface of the second injection molded part.

13. The push rod assembly according to claim 12, characterized in that There are multiple protrusions, and the multiple protrusions are arranged at intervals around the axis of the push rod.

14. The push rod assembly according to claim 4, characterized in that The push rod is connected to the insulating seat and the auxiliary moving spring piece by integral injection molding.

15. The push rod assembly according to claim 12, 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.

16. The push rod assembly according to claim 15, 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.

17. The push rod assembly according to claim 15, characterized in that The metal bracket is connected to the insulating seat, the pushing rod and the auxiliary moving spring by integral injection molding.

18. A relay, characterized in that: A push rod assembly comprising any one of claims 1-17.

19. A method for preparing a push rod assembly, characterized in that: include: By means of an injection molding process, a first injection molded part is formed on the surface of the auxiliary movable spring piece, so that the first injection molded part covers at least a portion of the auxiliary movable spring piece; The second injection molded part is formed on the surface of the first injection molded part through the injection molding process again, 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.

20. The method for preparing a push rod assembly according to claim 19, characterized in that: The preparation method of forming a second injection molded part on the surface of the first injection molded part by the injection molding process again includes: Providing a push rod, and inserting the push rod axially into the first through hole of the auxiliary movable spring until one axial end surface of the push rod abuts against the limiting portion of the first injection molded part; Through the injection molding process, a second injection molded part is formed on the surface of the first injection molded part after the push rod is assembled, so that at least a part of the second injection molded part is located between the peripheral side surface of the push rod and the first injection molded part.

21. The method for preparing a push rod assembly according to claim 20, characterized in that: The preparation method of forming a second injection molded part on the surface of the first injection molded part by the injection molding process again further 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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