An injection molding mold

Abstract

The application discloses an injection molding mold for molding a composite insulator, the composite insulator comprising an insulating core, a sheath and a shed, the injection molding mold comprising a mold frame, a plurality of inserts and a runner system; a mold cavity comprising a molding cavity and at least two limiting cavities, a limiting assembly being arranged in the limiting cavities; the limiting assembly comprising a top rod, a pull rod and a connecting piece, the connecting piece being arranged between the top rod and the pull rod, the pull rod driving the top rod to move through the connecting piece; a mutual connecting surface of the pull rod and the connecting piece being a non-smooth plane structure, the mutual connecting surface comprising an inclined surface and a plane which are mutually connected. Through the inclined surface cooperation, the connecting piece can continuously convert the pushing force transmitted by the pull rod into a pressing force, so that the top rod gradually approaches the surface of the insulating core; during injection, the top rod is tightly attached to the surface of the insulating core, through the plane cooperation, the limiting assembly can effectively resist the injection pressure without retreating or loosening, so as to ensure that the positioning of the insulating core is accurate and stable during the whole injection process.

Description

Technical Field

[0001] This application relates to the field of insulator injection molding technology, and in particular to an injection molding die. Background Technology

[0002] In the molding process of insulators, silicone rubber skirts and sheaths are typically encapsulated on the outside of the core using a bulk vacuum injection molding process. However, in insulators with large-diameter cores, the core deforms due to the pressure of the silicone rubber within the mold cavity caused by long injection time, high injection pressure, high injection temperature, and its own weight. This results in uneven sheath thickness, with some areas even exposing the core, failing to meet design requirements and leading to a low product yield. Current technology typically incorporates feed ports on both sides of the mold to counteract the deformation caused by injection pressure, and adds a positioning structure in the middle of the mold cavity to fix the core vertically. However, this positioning structure results in areas where the core is pressed against being partially encapsulated by silicone rubber, requiring manual repair after the overall injection process. This is costly, inefficient, and the quality of manual repairs is inconsistent, potentially affecting the overall appearance of the product. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the main purpose of this application is to provide an injection molding mold to solve the problems of high cost, low efficiency and poor appearance consistency caused by the inability to cover parts of the core due to the current limiting method and the need for subsequent manual repair.

[0004] To solve the above-mentioned technical problems, the technical solution adopted in this application is: an injection molding die for molding composite insulators, the composite insulator including an insulating core and a sheath and skirts covering the insulating core, the injection molding die including a mold frame, several inserts and a runner system, the mold frame including an upper mold and a lower mold, the several inserts being assembled in the upper mold and the lower mold, after the upper mold and the lower mold are closed, the several inserts are joined together to form a mold cavity, the runner system being connected to the mold cavity for guiding the injection of rubber into the mold cavity; the mold cavity including a molding cavity and at least two limiting cavities, the at least two limiting cavities being symmetrically arranged on both sides of the molding cavity, the limiting cavities being provided with limiting components, the limiting cavities including interconnected through holes and sliding grooves, the shaft of the through holes... The direction of extension of the sliding groove is perpendicular to the direction of extension of the sliding groove. The limiting component includes a push rod, a pull rod, and a connector. The push rod is slidably disposed in the through hole, the pull rod is slidably disposed in the sliding groove, and the connector is disposed between the push rod and the pull rod, and the connector is located in the through hole, so that the pull rod drives the push rod to move axially along the through hole through the connector. The mating surface between the pull rod and the connector is a non-smooth planar structure. The mating surface includes a connected inclined surface and a plane. The axial direction of the through hole and the extension direction of the sliding groove are located in the same vertical plane. The inclination direction of the inclined surface between the pull rod and the connector is located between the axial direction of the through hole and the extension direction of the sliding groove. The extension direction of the plane between the pull rod and the connector is parallel to the extension direction of the sliding groove.

[0005] In one embodiment, the two ends of the push rod are an ejection end and a first transmission end, respectively. The insulating core is placed in the molded cavity. The ejection end passes through the through hole and abuts against the insulating core. The end face of the ejection end is set as an arc-shaped surface that is concave inward toward the first transmission end to match the insulating core.

[0006] In one embodiment, the first end of the through hole is connected to the forming cavity, and the second end of the through hole is connected to the sliding groove. The through hole includes a first through hole portion, a second through hole portion, and a third through hole portion that are connected to each other. The first through hole portion is close to the first end of the through hole, the third through hole portion is close to the second end of the through hole, and the second through hole portion is located between the first through hole portion and the third through hole portion. The cross-sectional dimension of the first through hole portion is smaller than the cross-sectional dimension of the second through hole portion, so that a first step surface is formed between the first through hole portion and the second through hole portion. The cross-sectional dimension of the second through hole portion is smaller than the cross-sectional dimension of the third through hole portion, so that a second step surface is formed between the second through hole portion and the third through hole portion.

[0007] In one embodiment, the outer periphery of the push rod near the first transmission end is provided with a protrusion that protrudes outward along the length direction perpendicular to the push rod. The protrusion is integrally formed with the push rod. After the push rod is installed in the through hole, the end face of the protrusion near the ejection end can approach and abut against the first step surface.

[0008] In one embodiment, the two ends of the pull rod are a second transmission end and a moving end, respectively. The connecting member includes an assembly end and a third transmission end disposed opposite to each other. The first transmission end of the push rod is fixedly connected to the assembly end of the connecting member, and the second transmission end of the pull rod is slidably connected to the third transmission end of the connecting member.

[0009] In one embodiment, the first transmission end is provided with a first connecting part, and the connecting member includes a connecting body and a second connecting part that are connected to each other. The assembly end is located on one end face of the connecting body, and the assembly end is provided with a first connecting groove. The first connecting part is inserted into the first connecting groove so that the push rod is fixedly connected to the connecting member.

[0010] In one embodiment, the second connecting part is connected to the end face of the connecting body that is opposite to the assembly end. The second transmission end of the pull rod is provided with a second connecting groove and a third connecting groove that are connected to each other. The second connecting part is slidably engaged in the second connecting groove and the third connecting groove, so that the connecting part is slidably connected to the pull rod.

[0011] In one embodiment, the end face of the second connecting part includes a first inclined surface and a first plane that are connected to each other. The bottom of the second connecting groove includes a second inclined surface, and the bottom of the third connecting groove includes a second plane and a third inclined surface that are connected to each other. The two ends of the second plane are respectively connected to the second inclined surface and the third inclined surface. The second inclined surface extends from the second transmission end of the pull rod to one end of the second plane, and the third inclined surface extends from the other end of the second plane to the upper surface of the pull rod. The first inclined surface and the second inclined surface are closely connected, so that the second connecting part is engaged in the second connecting groove. Alternatively, the first plane and the second plane are closely connected, so that the second connecting part is engaged in the third connecting groove. The inclination angles of the first inclined surface, the second inclined surface, and the third inclined surface are equal.

[0012] In one embodiment, the limiting component includes a connecting rod and a driving component. The driving component is connected to the moving end of the pull rod via the connecting rod. The driving component includes a driving device, a mounting plate, and a heat insulation plate. The heat insulation plate is fixedly mounted on the outer side of the mold frame, and the mounting plate is fixedly connected to the outer side of the heat insulation plate away from the mold frame. The driving device is fixedly mounted on the mounting plate. The upper edge of the mounting plate protrudes from the upper edge of the heat insulation plate to form a protrusion. The pull rod has an integrally formed lug with at least one positioning hole. A positioning screw is installed in the positioning hole and can approach and abut against the protrusion to limit the maximum retraction distance of the pull rod.

[0013] In one embodiment, the injection molding die further includes a mold frame pressure plate and at least one tie rod limiting block. A first mounting groove is provided on one side of the mold frame pressure plate, which penetrates the surface of the mold frame pressure plate, making the mold frame pressure plate as a whole U-shaped structure for accommodating the tie rod. A limiting groove is provided on the side of the tie rod away from the mold frame, and the tie rod limiting block is engaged in the limiting groove and fixedly connected to the mold frame pressure plate.

[0014] In one embodiment, the injection molding die further includes a tie rod platen, which is fixedly installed on the mold frame platen of the upper mold and partially covers the surface of the tie rod away from the mold frame.

[0015] In one embodiment, a fourth mounting groove is provided on the mold frame pressure plate. The fourth mounting groove is located next to and communicates with the first mounting groove. The fourth mounting groove penetrates the surface of the mold frame pressure plate, and the cross-section of the fourth mounting groove matches the cross-section of the connector.

[0016] The beneficial effects of this application are as follows: The injection molding mold of this application is equipped with a limiting component, which includes a pull rod, a connector, and an ejector rod. The connector can continuously convert the thrust transmitted by the pull rod into a clamping force. The first inclined surface of the connector and the second inclined surface of the pull rod are closely fitted and slide relative to each other, forcing the connector to drive the ejector rod to slide towards the insulating core, thereby gradually bringing the ejector rod closer to the surface of the insulating core. During injection, the ejector rod is in close contact with the surface of the insulating core, and the first plane of the connector is in close contact with the second plane of the pull rod, which can effectively resist the injection pressure without retreating or loosening, thus ensuring that the insulating core is accurately and stably positioned throughout the injection process. After injection, the pull rod retracts, creating a specific gap between the ejector rod and the surface of the insulating core. The adhesive fills this gap, completely covering the area of ​​the insulating core that was originally covered, thereby achieving complete coverage of the insulating core without the need for subsequent manual repair. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the following will explain the terms used in the description of the embodiments:

[0018] Figure 1 This is a cross-sectional view of an injection molding die 100 in one embodiment of this application;

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the connector 430 in one embodiment of this application;

[0021] Figure 4 This is a three-dimensional structural schematic diagram of the connector 430 in one embodiment of this application from another perspective;

[0022] Figure 5 This is a three-dimensional structural schematic diagram of the pull rod 420 in one embodiment of this application;

[0023] Figure 6 This is a three-dimensional structural diagram of the pull rod 420 in one embodiment of this application from another perspective;

[0024] Figure 7 yes Figure 1Enlarged view of point B in the middle;

[0025] Figure 8 This is a partial top view of an injection molding die 100 in one embodiment of this application;

[0026] Figure 9 This is a partial top view of the mold frame pressure plate 101 installed in the upper mold 200 in one embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] See Figure 1 This application provides an injection molding die 100 for injection molding machines, used to mold composite insulators. The composite insulator includes a columnar insulating core and a sheath and skirts covering the insulating core. The injection molding die 100 is specifically used for the integral vacuum injection molding of the sheath and skirts of the composite insulator. The injection molding die 100 includes a mold frame, a plurality of inserts 110, and a runner system. The mold frame includes an upper mold 200 and a lower mold 300, both of which are hollow frame structures. The upper mold 200 and the lower mold 300 are closed to form the mold frame. The plurality of inserts 110 are assembled in the inner frames of the upper mold 200 and the lower mold 300. When the upper mold 200 and the lower mold 300 are closed, the plurality of inserts 110 are assembled together to form a complete mold cavity. The inner contour shape of the mold cavity is consistent with the outer contour shape of the skirts to be molded on the composite insulator. The runner system is connected to the mold cavity and is used to guide the injection of the rubber material into the mold cavity. The injection molding die 100 is set horizontally. The length direction of the injection molding die 100 in the horizontal direction is defined as the X-axis, the width direction of the injection molding die 100 in the horizontal direction is defined as the Y-axis, and the height direction of the injection molding die 100 in the vertical direction is defined as the Z-axis. The axial direction of the composite insulator is parallel to the X-axis, the X-axis is perpendicular to the Y-axis, and the Z-axis is perpendicular to the plane containing the X and Y axes.

[0029] In other embodiments, the injection molding die is not limited to the molding of composite insulators, but can also be used to mold other products with similar structural features. Specifically, the aforementioned product may include a workpiece and a molding material covering the outer periphery of the workpiece. It is understood that when the injection molding die is applied to the molding of the aforementioned product, the inner contour shape of the injection molding die cavity is consistent with the outer contour shape of the molded product, and the limiting component is used to position the workpiece to be molded and prevent movement. Therefore, any technical solution that uses the injection molding die provided in this application to cover and mold a workpiece is an extension of the technical concept of this application and should be included within the protection scope of this application.

[0030] After the injection molding mold 100 is fully closed, the upper mold 200 and the lower mold 300 are arranged along the Z-axis, with the upper mold 200 located above the injection molding mold 100 and the lower mold 300 located below the injection molding mold 100. The directional terms "upper" and "lower" used in this application are based on the orientation shown in the accompanying drawings or the actual positional relationship, and are used only for ease of description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0031] The insulating core is placed in the mold cavity along the X-axis, meaning the axial direction of the insulating core is parallel to the X-axis. The runner system includes injection holes and runners. The injection holes penetrate the upper mold 200, and the runners are located in the lower mold 300. The inlet of the injection hole connects to the feed port on the injection molding machine, and the outlet of the injection hole connects to the inlet of the runner. The outlet of the runner connects to the mold cavity. After the upper mold 200 and the lower mold 300 are closed, the rubber compound is injected from the feed port on the injection molding machine, and then sequentially enters the runners and mold cavity through the injection holes, subsequently filling the mold cavity. After high-temperature vulcanization, the rubber compound coats the outer periphery of the insulating core to form a sheath and skirt.

[0032] The mold cavity includes a molding cavity 120 and at least two limiting cavities 130, which are symmetrically arranged on both sides of the molding cavity 120 and are connected to the molding cavity 120. The molding cavity 120 includes a receiving cavity extending along the X-axis and an umbrella-shaped cavity surrounding the receiving cavity. The receiving cavity has a columnar hollow structure, and its outer diameter is larger than that of the insulating core, so as to form a sheath with a certain thickness outside the insulating core. The inner contour shape of the umbrella-shaped cavity is consistent with the outer contour of the required umbrella skirt, and the umbrella-shaped cavity is connected to the receiving cavity, allowing the umbrella skirt and sheath to be integrally injection molded. A limiting component 400 is provided within the limiting cavity 130. The limiting component 400 is slidably disposed within the limiting cavity 130 and positions the insulating core during injection molding by abutting against it. Specifically, after the insulating core is placed in the accommodating cavity along the X-axis, the limiting component 400 makes the axis of the insulating core coincide with the axis of the accommodating cavity. The rubber material enters and fills the accommodating cavity and umbrella cavity along the flow channel system. Through high-temperature vulcanization, a sheath and umbrella skirt can be formed on the outside of the insulating core. Coinciding the axis of the insulating core with the axis of the accommodating cavity can ensure that the thickness of the sheath is uniform.

[0033] In this embodiment, two limiting cavities 130 are provided, located on the upper mold 200 and the lower mold 300 respectively, and are symmetrically arranged with respect to the planes in the X-axis and Y-axis directions. Two limiting components 400 are also provided, and are slidably disposed in the two limiting cavities 130 respectively. The two limiting components 400 are symmetrically arranged with respect to the axial direction of the insulating core, and are used to position the two sides of the insulating core in the Z-axis direction.

[0034] Combination Figure 2 As shown, the limiting cavity 130 and limiting component 400 on the lower mold 300 are used as examples for specific explanation. The limiting cavity 130 includes a through hole 131 and a sliding groove 132 that are interconnected. The axial direction of the through hole 131 is parallel to the Z-axis direction, and the extension direction of the sliding groove 132 is parallel to the Y-axis direction. That is, the axial direction of the through hole 131 and the extension direction of the sliding groove 132 are perpendicular to each other, making the limiting cavity 130 L-shaped as a whole. The through hole 131 passes through several inserts 110 on the lower mold 300. The two ends of the through hole 131 are the first end 1311 and the second end 1312, respectively. The first end 1311 is connected to the forming cavity 120, and the second end 1312 is connected to the sliding groove 132. The sliding groove 132 is provided on the lower surface of the lower mold 300. The sliding groove 132 extends from the second end 1312 of the through hole 131 along the Y-axis direction to the outer edge of the lower mold 300.

[0035] The limiting assembly 400 includes a push rod 410, a pull rod 420, and a connector 430. The push rod 410 is slidably disposed in the through hole 131, the pull rod 420 is slidably disposed in the sliding groove 132, and the connector 430 is disposed between the push rod 410 and the pull rod 420, and the connector 430 is located in the through hole 131, so that the pull rod 420 drives the push rod 410 to move axially along the through hole 131, that is, along the Z-axis direction, through the connector 430. The mating surfaces of the pull rod 420 and the connector 430 are non-smooth planar structures. The mating surfaces include interconnected inclined surfaces and planes. The axial direction of the through hole 131 and the extension direction of the sliding groove 132 are located in the same vertical plane. The inclination direction of the inclined surface between the pull rod 420 and the connector 430 is located between the axial direction of the through hole 131 and the extension direction of the sliding groove 132. The extension direction of the plane between the pull rod 420 and the connector 430 is parallel to the extension direction of the sliding groove 132.

[0036] Both the push rod 410 and the pull rod 420 are long rod structures. The two ends of the push rod 410 are the ejection end 411 and the first transmission end 412, respectively. The two ends of the pull rod 420 are the second transmission end 421 and the moving end 422, respectively. The connecting member 430 includes an assembly end 431 and a third transmission end 432 arranged opposite to each other. The first transmission end 412 of the push rod 410 is fixedly connected to the assembly end 431 of the connecting member 430. The second transmission end 421 of the pull rod 420 is slidably connected to the third transmission end 432 of the connecting member 430. The pull rod 420 moves toward the connecting member 430 along the Y-axis direction to drive the connecting member 430 to move along the Z-axis direction. Then, the connecting member 430 drives the push rod 410 to move along the Z-axis direction. The insulating core is placed in the molding cavity 120. After the ejection end 411 passes through the through hole 131, it can be released and abut against the insulating core, thereby limiting the assembly 400 to form an L-shaped transmission structure.

[0037] The outer surface of the insulating core is a circumferential surface, meaning its cross-section is circular. The end face of the ejector end 411 is configured as an inwardly concave arc-shaped surface facing the first transmission end 412 to match the insulating core. The arc-shaped surface tightly fits the outer surface of the insulating core. Compared to a planar structure, this avoids stress concentration on the insulating core, preventing damage to its outer surface. In other embodiments, when the injection molding mold is used to mold other products with similar structural features, the ejector end of the ejector rod abuts against the workpiece. The end face shape of the ejector end is configured to match the outer surface shape of the workpiece to ensure a tight fit. Specifically, when the cross-sectional shape of the workpiece is rectangular, the end face of the ejector end is set as a plane; when the cross-sectional shape of the workpiece is elliptical, the end face of the ejector end is set as an arc-shaped concave surface matching the outer diameter of the workpiece; when the cross-sectional shape of the workpiece is other shapes, the end face of the ejector end is correspondingly machined as a mating surface complementary to that shape. Regardless of the specific cross-sectional shape of the workpiece, the end face of the ejector end can fit tightly against the outer surface of the workpiece and form a stable surface contact, thus providing reliable positioning in different applications.

[0038] The push rod 410 has a protrusion 413 on its outer periphery near the first transmission end 412, which protrudes outward along the length direction perpendicular to the push rod 410. The protrusion 413 is integrally formed with the push rod 410 and has a ring structure, that is, the cross-section of the protrusion 413 is circular. In other words, the push rod 410 is a rod with a cross-shaped longitudinal section.

[0039] The through hole 131 is a stepped hole 131, comprising three interconnected through hole portions along the Z-axis direction, namely a first through hole portion, a second through hole portion, and a third through hole portion. The first through hole portion is located near the first end 1311 of the through hole 131 to connect to the molded cavity 120. The third through hole portion is located near the second end 1312 of the through hole 131 to connect to the sliding groove 132. The second through hole portion is located between the first through hole portion and the third through hole portion, and the second through hole portion connects the first through hole portion and the third through hole portion. The cross-sectional dimension of the first through hole portion is smaller than the cross-sectional dimension of the second through hole portion, forming a first stepped surface 1313 between the first through hole portion and the second through hole portion. The cross-sectional dimension of the second through hole portion is smaller than the cross-sectional dimension of the third through hole portion, forming a second stepped surface 1314 between the second through hole portion and the third through hole portion. The ejector end 411 of the push rod 410 passes through the third through hole, then through the second through hole, and finally into the first through hole, so that the push rod 410 is installed in the through hole 131. The end face of the protrusion 413 near the ejector end 411 can approach and abut against the first step surface 1313, so that the protrusion 413 is located in the second through hole. The first transmission end 412 is fixedly connected to the assembly end 431 of the connector 430, and the connector 430 is located in the third through hole. After the first transmission end 412 and the assembly end 431 of the connector 430 are fixedly connected, their relative positions no longer change. At this time, the distance between the end face of the assembly end 431 of the connector 430 near the push rod 410 and the end face of the protrusion 413 near the first end 1311 is defined as D1, and the length of the second through hole along its axial direction is defined as D2, where D1 ≥ D2. When the connector 430 pushes the push rod 410 toward the forming cavity 120 along the Z-axis, the protrusion 413 moves toward the first step surface 1313 along with the push rod 410. Since D1≥D2, before the protrusion 413 abuts against the first step surface 1313, a sufficient gap is always maintained between the assembly end 431 of the connector 430 and the second step surface 1314, that is, the assembly end 431 of the connector 430 will never interfere with the second step surface 1314; only when the protrusion 413 continues to advance and finally abuts against the first step surface 1313 will the assembly end 431 of the connector 430 contact the second step surface 1314 or still maintain a gap, ensuring the smooth advance of the push rod 410 and avoiding movement jamming or inaccurate positioning caused by the assembly end 431 abutting against the second step surface 1314 too early.

[0040] In this embodiment, the cross-section of the area on the push rod 410 other than the protrusion 413 is square. The cross-sectional dimension of the push rod 410 is the side length of its cross-section. The cross-section of the first through hole also corresponds to a square, and its cross-sectional dimension is the side length of its cross-section. By setting the side length of the push rod 410's cross-section to be equal to the side length of the first through hole's cross-section, there is no gap between the push rod 410 and the first through hole after the push rod 410 is inserted. This allows the push rod 410 to move stably along the Z-axis within the through hole 131, preventing it from shifting. Furthermore, the square cross-section of the push rod 410 and the first through hole prevents circumferential rotation of the push rod 410.

[0041] To match the annular protrusion 413, the cross-section of the second through hole is circular, and the outer diameter of the protrusion 413 is equal to the diameter of the second through hole. This prevents the rubber material from flowing from the molding cavity 120 into the limiting cavity 130 or even out of the lower mold 300 during injection. Furthermore, the diameter of the second through hole is larger than the side length of the cross-section of the first through hole, allowing the protrusion 413 to approach and abut against the first stepped surface 1313. A sealing plate 401 is provided between the protrusion 413 and the first stepped surface 1313. The sealing plate 401 has an opening at its center, allowing it to be directly fitted onto the outer periphery of the ejector pin 410. The sealing plate 401 is made of a high-temperature resistant rubber material, such as fluororubber. When the ejector rod 410 moves along the Z-axis toward the insulating core and the ejector end 411 presses against the insulating core, the protrusion 413 squeezes the sealing plate 401, causing the sealing plate 401 to fit tightly against the first step surface 1313. This forms a seal between the protrusion 413 and the through hole 131, effectively isolating the high-pressure adhesive during injection and forming a reliable end-face seal to meet the sealing requirements during the injection process. This ensures stable pressure within the molding cavity 120 and prevents adhesive leakage from the limiting cavity 130. Simultaneously, a sealing groove is formed on the outer circumferential surface of the protrusion 413, and a sealing ring is installed within the sealing groove. The sealing ring maintains contact and interference fit with the inner wall of the second through hole at all times. Throughout the entire stroke of the ejector rod 410, the sealing ring continues to provide a seal, further ensuring the sealing within the molding cavity 120 and greatly improving the reliability and process stability of the injection molding mold 100.

[0042] The cross-section of the connector 430 is also square, and the cross-sectional dimension of the connector 430 is the side length of the cross-section of the connector 430. The cross-section of the third through hole is also matched accordingly, being square, and the cross-sectional dimension of the third through hole is the side length of the cross-section of the third through hole. By setting the side length of the cross-section of the third through hole to be equal to the side length of the cross-section of the connector 430, there is no gap between the connector 430 and the third through hole after the connector 430 is inserted into the third through hole. This allows the connector 430 to move stably along the Z-axis direction within the through hole 131, preventing the connector 430 from shifting. Furthermore, the square cross-section of the connector 430 and the third through hole prevents the connector 430 from rotating circumferentially. Meanwhile, the side length of the cross-section of the third through hole is greater than the diameter of the second through hole. When the push rod 410 and the sealing plate 401 and sealing ring pre-installed on the outer periphery of the push rod 410 need to be installed together into the limiting cavity 130, the assembly direction is to push from the third through hole to the second through hole. Since the side length of the cross-section of the third through hole is greater than the diameter of the second through hole, the outer peripheral surface of the protrusion 413 and the outer peripheral surface of the sealing ring maintain a gap with the inner wall of the third through hole during the process of passing through the third through hole, and do not come into contact, which facilitates assembly.

[0043] In other embodiments, the protrusion may also be a structure with a square cross-section. In this case, the second through hole is also configured to have a square cross-section, and the side length of the cross-section of the second through hole is equal to the side length of the cross-section of the protrusion, so as to ensure that the protrusion can move stably along the Z-axis within the second through hole.

[0044] In other embodiments, the cross-sections of the first through-hole and the push rod can both be rectangles of the same size, and the cross-sectional size of the second through-hole is ensured to be larger than that of the first through-hole to ensure the formation of the first stepped surface, preventing the protrusion from penetrating the first through-hole. Furthermore, the cross-sections of the third through-hole and the connector can also be rectangles of the same size, without limitation.

[0045] In the above embodiments, the top rod 410 and the connector 430 are rectangular in cross-section to prevent circumferential deflection of the top rod 410 and the connector 430 during movement. The size of their cross-sections can be set according to specific circumstances and is not limited here.

[0046] The portion of the push rod 410 located between the protrusion 413 and the first transmission end 412 is the first connecting portion 414 of the push rod 410. The first connecting portion 414 is provided with a first connecting hole 415. The first connecting hole 415 passes through the first connecting portion 414 along the length direction perpendicular to the push rod 410 and is used to fix it to the connector 430.

[0047] Combination Figure 3 and Figure 4 As shown, the connector 430 has a block structure and includes a connecting body 433 and a second connecting portion 434 that are connected to each other. The assembly end 431 of the connector 430 is located on one end face of the connecting body 433, and the second connecting portion 434 is connected to the end face of the connecting body 433 that is opposite to the assembly end 431. The second connecting portion 434 serves as the third transmission end 432 of the connector 430 and is used to slidably connect with the pull rod 420. The connecting body 433 and the second connecting portion 434 are integrally formed.

[0048] The assembly end 431 is provided with a first connecting groove 4311. Two through second connecting holes 4312 are provided on the two side walls of the first connecting groove 4311. The size of the first connecting part 414 matches the size of the first connecting groove 4311, so that the first connecting part 414 can be inserted into the first connecting groove 4311. After the first connecting part 414 is inserted into the first connecting groove 4311, the first connecting hole 415 and the two second connecting holes 4132 are axially matched. The fastener passes through one of the second connecting holes 4132, the first connecting hole 415 and the other second connecting hole 4132 in sequence, so that the push rod 410 and the connector 430 are fixedly connected, ensuring the directness and reliability of the force transmission between the push rod 410 and the connector 430, effectively preventing the push rod 410 from rotating or moving during operation. Then the push rod 410 can drive the connector 430 to move along the Z-axis. The first connecting groove 4311 can extend in any direction on the plane where the X-axis and Y-axis are located. Correspondingly, the first connecting hole 415 can also penetrate the first connecting part 414 in any direction on the plane where the X-axis and Y-axis are located, as long as the axial direction of the first connecting hole 415 is consistent with the axial direction of the second connecting hole 4312.

[0049] The end face of the second connecting part 434 is the mating surface on the connector 430 that connects to the pull rod 420. The end face of the second connecting part 434 is a non-smooth planar structure, including a first inclined surface 4341 and a first plane 4342 that are connected to each other. That is, the inclined surface included in the mating surface on the connector 430 is the first inclined surface 4341, and the plane included in the mating surface on the connector 430 is the first plane 4342. The included angle between the first inclined surface 4341 and the first plane 4342 is less than 180°. When the connector 430 is disposed between the top rod 410 and the pull rod 420, the first plane 4342 is parallel to the horizontal plane, and the first inclined surface 4341 is set at a certain angle to the horizontal plane. The axial direction of the through hole 131 and the extending direction of the sliding groove 132 are located in the same vertical plane. The inclination direction of the first inclined surface 4341 is located between the axial direction of the through hole 131 and the extending direction of the sliding groove 132, and the extending direction of the first plane 4342 is parallel to the extending direction of the sliding groove 132. The cross-section of the second connecting part 434 can be any shape such as rectangular, T-shaped, or trapezoidal. Preferably, the cross-section of the second connecting part 434 is T-shaped to facilitate the second connecting part 434 being engaged with the pull rod 420.

[0050] Combination Figure 5 and Figure 6 As shown, the pull rod 420 can slide along the Y-axis direction within the sliding groove 132. The second transmission end 421 of the pull rod 420 is slidably connected to the third transmission end 432 of the connector 430, and the moving end 422 is located outside the injection molding mold 100. When the pull rod 420 slides along the Y-axis towards the direction closer to the ejector rod 410, the pull rod 420 pushes the connector 430, causing the connector 430 and the pull rod 420 to slide relative to each other along the inclined direction of their mating surfaces. Since the connector 430 is engaged in the third through hole, the connector 430 can only slide along the Z-axis towards the direction closer to the ejector rod 410. Subsequently, the connector 430 drives the ejector rod 410 to slide along the Z-axis towards the direction closer to the insulating core within the through hole 131. To ensure that the pull rod 420 can still slide smoothly under high-temperature conditions, a high-temperature resistant lubricating oil is coated on the sliding surface where the pull rod 420 mates with the sliding groove 132, which can effectively reduce the coefficient of friction and motion resistance.

[0051] Specifically, the second transmission end 421 of the pull rod 420 is provided with a second connecting groove 426 and a third connecting groove 427 that are connected to each other. The surface of the pull rod 420 away from the mold frame is defined as the upper surface 424 of the pull rod 420. The second connecting groove 426 extends from the end face of the second transmission end 421 of the pull rod to communicate with one end of the third connecting groove 427, and the other end of the third connecting groove 427 extends to the upper surface 424 of the pull rod, thereby forming a slidably connected area at the second transmission end 421 of the pull rod 420. The second connecting portion 434 of the connector 430 is slidably engaged in the second connecting groove 426 and the third connecting groove 427, and the second connecting portion 434 can slide along the extension direction of the second connecting groove 426 until it slides into the third connecting groove 427. Conversely, the second connecting portion 434 can slide along the extension direction of the third connecting groove 427 until it slides into the second connecting groove 426, so that the connector 430 and the pull rod 420 are slidably connected.

[0052] The bottoms of the second connecting groove 426 and the third connecting groove 427 are connected to each other to form a mating surface on the pull rod 420 that connects to the connector 430. The mating surface formed by the second connecting groove 426 and the third connecting groove 427 is a non-smooth planar structure. The bottom of the second connecting groove 426 includes a second inclined surface 4261, and the bottom of the third connecting groove 427 includes a second plane 4271 and a third inclined surface 4272 that are connected to each other. That is, the inclined surfaces included in the mating surface on the pull rod 420 are the second inclined surface 4261 and the third inclined surface 4272, and the plane included in the mating surface on the pull rod 420 is the second plane 4271. In the same vertical plane where the axial direction of the through hole 131 and the extending direction of the sliding groove 132 lie, the inclination direction of the second inclined surface 4261 is located between the axial direction of the through hole 131 and the extending direction of the sliding groove 132, and the extending direction of the second plane 4271 is parallel to the extending direction of the sliding groove. That is, the second inclined surface 4261 forms a certain angle with the horizontal plane and is inclined in a direction that forms a certain angle with the length direction of the tie rod 420. At the same time, the inclination direction of the third inclined surface 4272 is the same as the inclination direction of the second inclined surface 4261.

[0053] The two ends of the second plane 4271 are respectively connected to the second inclined plane 4261 and the third inclined plane 4272. Specifically, the second inclined plane 4261 of the second connecting groove 426 extends from the end face of the second transmission end 421 of the pull rod 420 to the third connecting groove 427 until it reaches one end of the second plane 4271. The third inclined plane 4272 extends from the other end of the second plane 4271 toward the upper surface 424 of the pull rod 420 at a certain inclination angle until it reaches the upper surface 424 of the pull rod 420. That is, the second inclined plane 4261, the second plane 4271, and the third inclined plane 4272 are sequentially connected to each other from the end face of the second transmission end 421 of the pull rod 420 to the upper surface of the pull rod 420, thereby forming a slidably connected area at the second transmission end 421 of the pull rod 420. The inclination direction of the second inclined plane 4261 is consistent with the inclination direction of the first inclined plane 4341, so that the second connecting part 434 can slide and connect in the second connecting groove 426 and move according to a preset guide path. The angle between the second inclined plane 4261 and the horizontal plane is defined as the inclination angle of the second inclined plane 4261, and the angle between the first inclined plane 4341 and the horizontal plane is defined as the inclination angle of the first inclined plane 4341. The inclination angle of the second inclined plane 4261 is equal to the inclination angle of the first inclined plane 4341. When the second connecting part 434 is engaged in the second connecting groove 426, the first inclined plane 4341 of the second connecting part 434 is in close contact with the second inclined plane 4261, so that the pull rod 420 and the connecting member 430 are slidably connected. Similarly, the inclination angle of the third inclined plane 4272 is also equal to the inclination angle of the first inclined plane 4341.

[0054] To ensure the second connecting part 434 mates with the second connecting groove 426, the cross-section of the second connecting groove 426 is designed to have the same shape and size as the cross-section of the second connecting part 434. When the pull rod 420 is installed in the sliding groove 132, the vector of the inclination direction of the second connecting groove 426 can be decomposed into a Y-axis component and a Z-axis component in the vertical plane. When the pull rod 420 and the connector 430 slide along the second connecting groove 426, their force can be decomposed into two orthogonal components on the Y-axis and Z-axis, ensuring that the force transmitted through the second connecting groove 426 can be converted into a pushing force in the Y-axis direction and a locking force in the Z-axis direction. By setting the inclination angle of the second connecting groove 426 to a smaller value, the ratio of the displacement of the connector 430 along the Z-axis to the displacement of the pull rod 420 along the Y-axis is smaller. This means the pull rod 420 needs to move a larger Y-axis distance to produce a relatively small Z-axis displacement in the connector 430 and the push rod 410. This allows for more precise motion control of the push rod 410, enabling accurate control of the insulating core's clamping position. Preferably, the inclination angle of the second connecting groove 426 is 20°~45°, for example, 20°, 25°, 35°, and 45°, meaning the inclination angles of the first inclined surface 4341, the second inclined surface 4261, and the third inclined surface 4272 are all 20°~45°.

[0055] Specifically, when the second transmission end 421 of the pull rod 420 contacts and connects with the third transmission end of the connector 430, the first inclined surface 4341 and the second inclined surface 4261 are tightly connected, so that the second connecting part 434 is locked in the second connecting groove 426. As the pull rod 420 moves, the first inclined surface 4341 and the second inclined surface 4261 slide relative to each other until the first inclined surface 4341 and the second inclined surface 4261 separate from each other. At this time, the first plane 4342 and the second plane 4271 are tightly connected, so that the second connecting part 434 is locked in the third connecting groove 427. As the pull rod 420 moves, the first plane 4342 and the second plane 4271 slide relative to each other until the first inclined surface 4341 contacts the third inclined surface 4272, and the pull rod 420 can no longer move. The first plane 4342 and the second plane 4271 serve as the positioning and load-bearing surfaces of the connector 430 and the pull rod 420, respectively. Compared to the inclined sliding contact surface, the planar fit provides stronger stability and more reliable load-bearing capacity. The third inclined plane 4272 helps to provide additional lateral support, ensuring that the limiting assembly 400 maintains overall rigidity and stability when subjected to complex loads. Furthermore, the inclination angle of the third inclined plane 4272 is equal to that of the first inclined plane 4341, ensuring that the second transmission end 421 of the pull rod 420 is tightly connected to the third transmission end of the connector 430, preventing the sharp corners of the edges from colliding and damaging the pull rod 420 or the connector 430.

[0056] Combination Figure 7As shown, the limiting component 400 also includes a connecting rod 440 and a driving component 450. The driving component 450 is connected to the moving end 422 of the pull rod 420 via the connecting rod 440. The moving end 422 is provided with a fourth connecting groove 423. One end of the connecting rod 440 is connected to the fourth connecting groove 423, and the other end is connected to the driving component 450. When the pull rod 420 is installed in the sliding groove 132, the extension direction of the fourth connecting groove 423 is parallel to the Z-axis direction and passes through the moving end 422 of the pull rod 420. One end of the connecting rod 440 forms a third connecting portion (not shown in the figure) that cooperates with the fourth connecting groove 423. Preferably, the cross-sectional shape of the fourth connecting groove 423 is T-shaped, and correspondingly, the cross-sectional shape of the third connecting portion is also T-shaped. During assembly, the third connecting portion of the connecting rod 440 is slid into the fourth connecting groove 423 of the moving end 422, thereby connecting one end of the connecting rod 440 and the pull rod 420.

[0057] The drive assembly 450 includes a drive unit 451, a mounting plate 452, and a heat insulation plate 453. The drive unit 451 includes a piston rod, which is coaxially and fixedly connected to the other end of a connecting rod 440, allowing the drive unit 451 to precisely control the sliding of the pull rod 420 along the Y-axis. Both the mounting plate 452 and the heat insulation plate 453 are plate structures. The heat insulation plate 453 is fixedly mounted to the outer side of the mold frame by fasteners, and the mounting plate 452 is fixedly connected to the outer side of the heat insulation plate 453 away from the mold frame by fasteners. The drive unit 451 is fixedly mounted on the mounting plate 452 by fasteners, thereby fixing the drive unit 451 to the injection molding mold 100. The heat insulation plate 453 effectively blocks heat transfer from the injection molding mold 100 to the drive unit 451 during the injection molding process, protecting the drive unit 451 from high temperatures and ensuring its operational reliability and service life. Furthermore, in the Z-axis direction, the height of the mounting plate 452 is greater than the height of the heat insulation plate 453, meaning the upper edge of the mounting plate 452 protrudes beyond the upper edge of the heat insulation plate 453, forming a protrusion. Correspondingly, a lug is integrally formed on the upper surface 424 of the pull rod 420 near the moving end 422. The lug has at least one positioning hole 425, the axis of which is in the Y-axis direction and passes through the lug. The positioning screw is installed in the positioning hole 425, with its head away from the mold frame and its end screwed in or out to adjust its length extending beyond the lug. When the drive device 451 drives the pull rod 420 to retract in the sliding groove 132 along the Y-axis direction, the pull rod 420 moves outward from the mold frame as a whole, and the lug and its positioning screw retract synchronously. When the head of the positioning screw abuts against the protrusion of the mounting plate 452, the protrusion prevents the pull rod 420 from retracting further, thereby precisely limiting the maximum retraction distance of the pull rod 420 in the sliding groove 132. By adjusting the screw depth of the positioning screw, the retraction distance of the pull rod 420 can be continuously and precisely changed, thereby controlling the retraction distance of the push rod 410.

[0058] In this embodiment, the drive device 451 is a hydraulic cylinder. In other embodiments, the drive device can also be a pneumatic cylinder or a servo electric push rod, as long as it can enable the rod to move along the Y-axis direction. No restrictions are imposed here.

[0059] In this embodiment, the upper mold 200 and the lower mold 300 are each provided with a limiting cavity 130. The limiting cavities 130 of the upper mold 200 and the lower mold 300 have the same structure and size, and each limiting cavity 130 is provided with a limiting component 400. In other embodiments, the upper mold 200 may also be provided with two or more limiting cavities 130. Correspondingly, the lower mold 300 may also be provided with the same number of two or more limiting cavities 130. The limiting cavities 130 on the upper mold 200 and the limiting cavities 130 on the lower mold 300 are symmetrically arranged to achieve symmetrical support of the insulating core, which will not be elaborated further here.

[0060] Combination Figures 8 to 9 The injection molding die 100 also includes two die frame plates 101. Each die frame plate 101 is a flat plate, and the two die frame plates 101 are respectively fixedly connected to the upper surface of the upper die 200 and the lower surface of the lower die 300 by fasteners. A first mounting groove 102 is provided on one side of the die frame plate 101. The first mounting groove 102 penetrates the plate surface of the die frame plate 101. When the die frame plate 101 is installed on the die frame, the extension direction of the first mounting groove 102 is parallel to the Y-axis direction, so that the die frame plate 101 has an overall U-shaped structure, which is used to house the tie rod 420 and facilitates the installation and removal of the limiting component 400. The shape and size of the first mounting groove 102 match the outer contour of the pull rod 420. Specifically, the dimension of the pull rod 420 along the X-axis is defined as the width of the pull rod 420, and the dimension of the first mounting groove 102 along the X-axis is defined as the width of the first mounting groove 102. The width of the first mounting groove 102 is slightly larger than the width of the pull rod 420, allowing the pull rod 420 to be smoothly inserted into or removed from the first mounting groove 102 without disassembling the mold frame pressure plate 101, reducing operational difficulty and greatly simplifying the maintenance and assembly process. At the same time, the surface of the mold frame pressure plate 101 away from the mold frame is set to be flush with the surface of the pull rod 420 away from the mold frame, making the outer contour of the injection molding mold 100 flat and facilitating tight installation with the injection molding machine.

[0061] Continue reading Figure 5The pull rod 420 has at least one limiting groove 429 on the side away from the mold frame. When the pull rod 420 is installed in the sliding groove 132, the limiting groove 429 extends along the X-axis and penetrates both sides of the width direction of the pull rod 420. In order to achieve the limiting and guiding of the pull rod 420, the injection molding mold 100 also includes at least one pull rod limiting block 103. The pull rod limiting block 103 is engaged in the limiting groove 429 and is fixedly connected to the mold frame pressure plate 101 by fasteners. Specifically, the mold frame pressure plate 101 has a second mounting groove 104 corresponding to the mounting position of the pull rod limiting block 103. The second mounting groove 104 does not penetrate the mold frame pressure plate 101, that is, its bottom is located inside the mold frame pressure plate 101 and does not penetrate the mold frame pressure plate 101. The shape and size of the second mounting groove 104 match the outer contour of the pull rod limiting block 103 so that the pull rod limiting block 103 can be accurately engaged in it and the surfaces of both are flush with the surfaces away from the mold frame. The bottom of the second mounting groove 104 is provided with several first mounting holes, and the pull rod limiting block 103 is provided with several corresponding second mounting holes. The number of second mounting holes is the same as that of the first mounting holes, and they are used for fasteners to pass through. During assembly, the pull rod limiting block 103 is placed into the second mounting groove 104, and then the fasteners are passed through the second mounting holes and the first mounting holes in sequence, thereby fixing the pull rod limiting block 103 to the mold frame pressure plate 101. The dimension of the limiting groove 429 along the Y-axis is defined as the width of the limiting groove 429, and the dimension of the pull rod limiting block 103 along the Y-axis is defined as the width of the pull rod limiting block 103. The width of the pull rod limiting block 103 is less than the width of the limiting groove 429. The difference in width between the two constitutes the effective sliding stroke of the pull rod 420 in the Y-axis direction. The pull rod limiting block 103 further limits the maximum sliding range of the pull rod 420 in the Y-axis direction by alternating contact with the two end faces of the limiting groove 429. In this embodiment, two limit grooves 429 and two pull rod limit blocks 103 are provided. The two limit grooves 429 are spaced apart on the pull rod 420 along the Y-axis direction. In other embodiments, the limit grooves and pull rod limit blocks can also be one, three or more, as long as they can be matched and limit the pull rod. No restrictions are imposed here.

[0062] In this embodiment, the injection molding machine includes a positioning block. The upper mold 200 needs to align with the positioning block on the injection molding machine to ensure that the relative position of the injection molding die 100 and the injection molding machine remains unchanged. Therefore, a positioning groove (not shown in the figure) needs to be formed on the mold frame plate 101 of the upper mold 200 to align with the positioning block on the injection molding machine. To prevent the positioning groove from penetrating the mold frame plate 101 due to excessive depth, the mold frame plate 101 of the upper mold 200 is designed to have a large thickness. In this case, the surface of the mold frame plate 101 away from the mold frame of the upper mold 200 may protrude beyond the surface of the tie rod 420 away from the mold frame, i.e., the mold frame plate 101 protrudes outward relative to the tie rod 420. If the injection molding machine is then mounted against the surface of the mold frame plate 101 away from the mold frame, a gap will appear between the tie rod 420 and the mounting surface of the injection molding machine. When the injection molding machine starts injecting the rubber compound, the injection pressure is transmitted to the ejector rod 410 and the pull rod 420 through the mold cavity. Due to the gap between the pull rod 420 and the mounting surface of the injection molding machine, the second transmission end 421 lacks effective support in the Z-axis direction, which easily leads to deformation and seriously affects the reliability of the positioning of the insulating core. To address this, the injection molding mold 100 also includes a pull rod pressure plate 105. The pull rod pressure plate 105 is fixedly installed on the mold frame pressure plate 101 of the upper mold 200 by fasteners and partially covers the surface of the pull rod 420 away from the mold frame. Specifically, the mold frame pressure plate 101 has a third mounting groove 106 corresponding to the mounting position of the pull rod pressure plate 105. The third mounting groove 106 does not penetrate the mold frame pressure plate 101, that is, its bottom is located inside the mold frame pressure plate 101 and does not penetrate the mold frame pressure plate 101. The shape of the third mounting groove 106 matches that of the tie rod pressure plate 105, so that the tie rod pressure plate 105 can be precisely engaged therein and the surface of the mold frame pressure plate 101 away from the mold frame is flush with the surface of the tie rod pressure plate 105 away from the mold frame. The bottom of the third mounting groove 106 has several third mounting holes, and the tie rod pressure plate 105 has correspondingly several fourth mounting holes, the number of which is the same as the number of third mounting holes, for fasteners to pass through. During assembly, the tie rod pressure plate 105 is placed into the third mounting groove 106, and then the fasteners are passed through the fourth mounting holes and then the third mounting holes in sequence, thereby fixing the tie rod pressure plate 105 and the mold frame pressure plate 101 together.

[0063] The tie rod pressure plate 105 partially covers the side of the tie rod 420 away from the mold frame. Specifically, when the tie rod 420 is pushed into the sliding groove 132 along the Y-axis to the maximum stroke position, the position of the second transmission end 421 is the starting point of the covered area. When the tie rod 420 is pulled out of the sliding groove 132 along the Y-axis to the maximum stroke position, the position of the second transmission end 421 is the ending point of the covered area. This interval is the covered area of ​​the tie rod pressure plate 105. The dimension of the third mounting groove 106 along the X-axis is defined as the width of the third mounting groove 106. The width of the third mounting groove 106 is greater than the width of the pull rod 420, so that the pull rod pressure plate 105 installed in the third mounting groove 106 can completely cover the second transmission end 421 of the pull rod 420 in the X-axis direction. This allows the injection pressure to be transmitted to the pull rod pressure plate 105 through the pull rod 420 during the injection process. The pull rod pressure plate 105 can provide reliable support for the pull rod 420, thereby effectively suppressing the swaying of the pull rod 420 in the Z-axis direction and ensuring the stability and reliability of the limiting component 400. The pull rod pressure plate 105 does not interfere with the limiting groove 429, thus not affecting the sliding of the pull rod limiting block 103 in the limiting groove 429. In other embodiments, if the thickness of the mold frame pressure plate will not be penetrated by the excessive depth of the positioning groove, the pull rod pressure plate may not be provided, as long as the stability of the limiting component meets the requirements. This is not a limitation.

[0064] In this embodiment, the cross-section of the connector 430 is square. The dimension of the sliding groove 132 along the X-axis is defined as the width of the sliding groove 132. The side length of the cross-section of the connector 430 is set to be greater than the width of the sliding groove 132. When the connector 430 slides toward the sliding groove 132 along the Z-axis with the pull rod 420, the connector 430 cannot enter the sliding groove 132 because the side length of the cross-section of the connector 430 is greater than the width of the sliding groove 132. The sliding direction of the connector 430 is restricted to the Z-axis direction and will not deviate from entering the sliding groove 132, thereby ensuring the sliding trajectory of the connector 430. Meanwhile, since the side length of the cross-section of the connector 430 is greater than the width of the sliding groove 132, and the size of the first mounting groove 102 matches the outer contour of the tie rod 420, that is, the side length of the cross-section of the connector 430 is greater than the width of the first mounting groove 102, when the connector 430 slides towards the sliding groove 132 along the Z-axis, the connector 430 cannot pass through the first mounting groove 102. If only the first mounting groove 102 is opened on the mold frame pressure plate 101, the sliding path of the connector 430 will be blocked by the mold frame pressure plate 101, resulting in motion interference. Therefore, in this embodiment, a fourth mounting groove 107 is further opened on the mold frame pressure plate 101. The position of the fourth mounting groove 107 corresponds to the sliding trajectory of the connector 430. Specifically, the fourth mounting groove 107 is opened on the side of and communicates with the first mounting groove 102, and the fourth mounting groove 107 penetrates the surface of the mold frame pressure plate 101 along the Z-axis. The cross-sectional shape of the fourth mounting groove 107 matches the square cross-section of the connector 430, and its side length is slightly larger than that of the connector 430, so that the connector 430 will not interfere when sliding along the Z-axis. Furthermore, it allows the connector 430 to be smoothly inserted into or removed from the through hole 131, solving the interference problem caused by the connector 430 being larger than the width of the first mounting groove 102. Moreover, it eliminates the need to disassemble the mold frame pressure plate 101, reducing the difficulty of operation and greatly simplifying the maintenance and assembly process.

[0065] In this application, taking the upper mold 200 as an example, when assembling the limiting component 400, the ejector rod 410 and the connector 430 are assembled first. The first connecting part 414 is inserted into the first connecting groove 4311. Fasteners pass through one of the second connecting holes 4132, the first connecting hole 415, and the other second connecting hole 4132 in sequence, so that the ejector rod 410 and the connector 430 are fixedly connected. A sealing plate 401 is installed on the end face of the protrusion 413 facing the ejector end 411, and a sealing ring is installed in the sealing groove. Then, the ejector rod 410 is inserted into the first through hole and the connector 430 is inserted into the third through hole. Then, the pull rod 420 and the connector 430 are assembled. The pull rod 420 is inserted into the sliding groove 132, and the second connecting part 434 of the connector 430 is slid into the second connecting groove 426 of the pull rod 420, so that the second connecting part 434 can slide smoothly along the second connecting groove 426. At this point, the ejector rod 410 and the pull rod 420 are perpendicular to each other and together with the connecting piece 430 form an L-shaped transmission structure. The mold frame pressure plate 101 is fixed to the upper surface of the upper mold 200 and the lower surface of the lower mold 300, respectively. The pull rod limiting block 103 is disposed in the limiting groove 429 and fixedly connected to the mold frame pressure plate 101 by fasteners. The pull rod pressure plate 105 is disposed in the third mounting groove 106 on the mold frame pressure plate 101 in the upper mold 200 and fixedly mounted on the mold frame pressure plate 101 by fasteners. Finally, the drive assembly 450 is connected to the moving end 422 of the pull rod 420 via the connecting rod 440. The installation of the limiting assembly 400 in the lower mold 300 is then completed in the same manner. Thus, the assembly of the limiting assembly 400 on the injection molding die is complete.

[0066] After the injection molding mold 100 starts working, the drive device 451 pushes the pull rod 420 to slide along the Y-axis towards the direction of the ejector rod 410 through the connecting rod 440. As the pull rod 420 slides, the second connecting part 434 of the connector 430 slides along the second connecting groove 426 of the pull rod 420. The connector 430 continuously converts the thrust in the Y-axis direction transmitted by the pull rod 420 into the clamping force in the Z-axis direction, forcing the connector 430 to drive the ejector rod 410 to slide along the Z-axis towards the direction of the insulating core. As a result, the ejector end 411 of the ejector rod 410 gradually approaches the surface of the insulating core along the Z-axis direction. At this time, the first inclined surface 4341 and the second inclined surface 4261 are in close contact with each other and slide relative to each other. When the connector 430 continues to slide on the pull rod 420 until the second connecting part 434 leaves the second connecting groove 426, the first plane 4342 and the second plane 427 gradually approach and stick together. The pull rod 420 can continue to move along the Y-axis towards the direction closer to the connector 430. At this time, the first plane 4342 and the second plane 427 slide relative to each other until the first inclined surface 4341 contacts the third inclined surface 4272. The first plane 4342 and the second plane 427 completely overlap, and the pull rod 420 stops sliding. At this time, the ejector end 411 of the push rod 410 is tightly attached to the surface of the insulating core, and the push rod 410 enters the first predetermined position.

[0067] When the pull rod 420 can no longer move, the injection molding machine begins to inject the rubber compound. After the rubber compound fills the mold cavity, it exerts pressure on the ejector rod 410, attempting to push the ejector rod 410 away from the insulating core along the Z-axis. However, since the pull rod 420 stops sliding and the first plane 4342 and the second plane 427 are completely overlapped, the ejector rod 410 can effectively resist the injection pressure without retreating or loosening, thus ensuring that the insulating core is accurately and stably positioned during the injection stage. After injection, the injection molding mold 100 is in a holding pressure state. The drive device 451 drives the pull rod 420 to slide away from the ejector rod 410 along the Y-axis. The first plane 4342 and the second plane 427 gradually move away from each other until they separate. At this time, the second connecting part 434 retracts into the second connecting groove 426 until the positioning bolt in the positioning hole 425 abuts against the mounting plate 452. Furthermore, the pull rod limiting block 103 abuts against the end face of the limiting groove 429, causing the pull rod 420 to stop sliding. At this point, the ejector end 411 of the ejector rod 410 separates from the surface of the insulating core, and the ejector rod 410 enters the second predetermined position. In the second predetermined position, a specific gap is created between the ejector end 411 of the ejector rod 410 and the surface of the insulating core. The distance of this gap is equal to or slightly greater than the design required sheath thickness, so that the surface of the insulating core, which was originally covered by the ejector end 411 of the ejector rod 410, is exposed in the molding cavity 120. Since the injection molding mold 100 is in a pressure-holding state, the adhesive gradually flows and fills the gap between the ejector end 411 and the surface of the insulating core, completely covering the area of ​​the insulating core that was originally covered, thereby achieving complete coverage of the insulating core without the need for subsequent manual repair.

[0068] Through the above working process, this application sets that when the push rod 410 is tightly attached to the surface of the insulating core, the push rod 410 enters the first predetermined position. At this time, the first plane 43432 and the second plane 427 coincide, which can effectively resist the injection pressure and resist the backward tendency of the push rod 410, ensuring that the insulating core is always in the precise predetermined position during the injection stage. When a specific gap is opened between the push rod 410's ejection end 411 and the surface of the insulating core, the push rod 410 enters the second predetermined position. At this time, the positioning bolt in the positioning hole 425 abuts against the mounting plate 452. Furthermore, the pull rod limiting block 103 abuts against the end face of the limiting groove 429. Through the mechanical limiting of the mounting plate 452 and the limiting groove 429, the gap between the push rod 410's ejection end 411 and the surface of the insulating core can be precisely designed, ensuring that the adhesive can evenly and completely cover the previously blocked area during secondary filling. The entire limiting component 400 can automatically complete the entire process of "advancing and tightening - retracting and releasing - filling the gap" without relying on manual intervention. This completely solves the technical problem that conventional limiting devices cannot withstand large injection pressure and require subsequent manual repairs, significantly improving the molding quality and production efficiency of composite insulators.

[0069] In other embodiments, the two limiting components may also press against the insulating core along the Y-axis or other directions, or the limiting cavities and limiting components may be set to four or more, as long as the insulating core can be symmetrically positioned, and there is no limitation here. Understandably, in order to ensure the force balance on the insulating core and avoid the insulating core tilting due to unilateral force, the limiting cavities and limiting components are preferably set to an even number; when the number of limiting cavities and limiting components exceeds two, the limiting cavities and limiting components are spaced apart along the X-axis to form multiple sets of positioning points distributed along the X-axis, ensuring the positional accuracy and stability of the insulating core.

[0070] The beneficial effects of this application are as follows: The injection molding mold of this application is equipped with a limiting component, which includes a pull rod, a connector, and an ejector rod. The connector can continuously convert the thrust transmitted by the pull rod into a clamping force. The first inclined surface of the connector and the second inclined surface of the pull rod are closely fitted and slide relative to each other, forcing the connector to drive the ejector rod to slide towards the insulating core, thereby gradually bringing the ejector rod closer to the surface of the insulating core. During injection, the ejector rod is in close contact with the surface of the insulating core, and the first plane of the connector is in close contact with the second plane of the pull rod, which can effectively resist the injection pressure without retreating or loosening, thus ensuring that the insulating core is accurately and stably positioned throughout the injection process. After injection, the pull rod retracts, creating a specific gap between the ejector rod and the surface of the insulating core. The adhesive fills this gap, completely covering the area of ​​the insulating core that was originally covered, thereby achieving complete coverage of the insulating core without the need for subsequent manual repair.

[0071] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An injection molding die for molding a composite insulator, the composite insulator comprising an insulating core and a sheath and skirts covering the insulating core, characterized in that, The injection molding die includes a mold frame, several inserts, and a runner system. The mold frame includes an upper mold and a lower mold. The several inserts are assembled in the upper mold and the lower mold. After the upper mold and the lower mold are closed, the several inserts are joined together to form a mold cavity. The runner system is connected to the mold cavity and is used to guide the injection of the rubber material into the mold cavity. The mold cavity includes a molding cavity and at least two limiting cavities. The at least two limiting cavities are symmetrically arranged on both sides of the molding cavity. A limiting component is provided in the limiting cavity. The limiting cavity includes a through hole and a sliding groove that are connected to each other. The axial direction of the through hole is perpendicular to the extension direction of the sliding groove. The limiting component includes a top rod, a pull rod, and a connector. The top rod is slidably disposed in the through hole, the pull rod is slidably disposed in the sliding groove, and the connector is disposed between the top rod and the pull rod, and the connector is located in the through hole, so that the pull rod drives the top rod to move axially along the through hole through the connector. The mating surface between the pull rod and the connector is a non-smooth planar structure. The mating surface includes an interconnected inclined surface and a plane. The axial direction of the through hole and the extension direction of the sliding groove are located in the same vertical plane. The inclination direction of the inclined surface between the pull rod and the connector is located between the axial direction of the through hole and the extension direction of the sliding groove. The extension direction of the plane between the pull rod and the connector is parallel to the extension direction of the sliding groove.

2. The injection molding die as described in claim 1, characterized in that, The two ends of the push rod are the ejection end and the first transmission end, respectively. The insulating core is placed in the molded cavity. The ejection end passes through the through hole and abuts against the insulating core. The end face of the ejection end is set as an arc-shaped surface that is concave inward toward the first transmission end to match the insulating core.

3. The injection molding die as described in claim 2, characterized in that, The first end of the through hole is connected to the molded cavity, and the second end of the through hole is connected to the sliding groove. The through hole includes a first through hole portion, a second through hole portion, and a third through hole portion that are connected to each other. The first through hole portion is close to the first end of the through hole, and the third through hole portion is close to the second end of the through hole. The second through hole portion is located between the first through hole portion and the third through hole portion. The cross-sectional dimension of the first through hole portion is smaller than the cross-sectional dimension of the second through hole portion, so that a first step surface is formed between the first through hole portion and the second through hole portion. The cross-sectional dimension of the second through hole portion is smaller than the cross-sectional dimension of the third through hole portion, so that a second step surface is formed between the second through hole portion and the third through hole portion.

4. The injection molding die as described in claim 3, characterized in that, The top rod has a protrusion on its outer periphery near the first transmission end that protrudes outward along the length direction perpendicular to the top rod. The protrusion is integrally formed with the top rod. After the top rod is installed in the through hole, the end face of the protrusion near the ejector end can approach and abut against the first step surface.

5. The injection molding die as described in claim 2, characterized in that, The two ends of the pull rod are a second transmission end and a moving end, respectively. The connecting member includes an assembly end and a third transmission end arranged opposite to each other. The first transmission end of the top rod is fixedly connected to the assembly end of the connecting member, and the second transmission end of the pull rod is slidably connected to the third transmission end of the connecting member.

6. The injection molding die as described in claim 5, characterized in that, The first transmission end is provided with a first connecting part, and the connecting member includes a connecting body and a second connecting part that are connected to each other. The assembly end is located on one end face of the connecting body, and the assembly end is provided with a first connecting groove. The first connecting part is inserted into the first connecting groove, so that the push rod is fixedly connected to the connecting member.

7. The injection molding die as described in claim 6, characterized in that, The second connecting part is connected to the end face of the connecting body that is opposite to the assembly end. The second transmission end of the pull rod is provided with a second connecting groove and a third connecting groove that are connected to each other. The second connecting part is slidably engaged in the second connecting groove and the third connecting groove, so that the connecting part is slidably connected to the pull rod.

8. The injection molding die as described in claim 7, characterized in that, The end face of the second connecting part includes a first inclined surface and a first flat surface that are connected to each other. The bottom of the second connecting groove includes a second inclined surface. The bottom of the third connecting groove includes a second flat surface and a third inclined surface that are connected to each other. The two ends of the second flat surface are respectively connected to the second inclined surface and the third inclined surface. The second inclined surface extends from the second transmission end of the pull rod to one end of the second flat surface. The third inclined surface extends from the other end of the second flat surface to the upper surface of the pull rod. The first inclined surface and the second inclined surface are closely connected, so that the second connecting part is engaged in the second connecting groove. Alternatively, the first flat surface and the second flat surface are closely connected, so that the second connecting part is engaged in the third connecting groove. The inclination angles of the first inclined surface, the second inclined surface, and the third inclined surface are equal.

9. The injection molding die as described in claim 5, characterized in that, The limiting assembly includes a connecting rod and a driving assembly. The driving assembly is connected to the moving end of the pull rod via the connecting rod. The driving assembly includes a driving device, a mounting plate, and a heat insulation plate. The heat insulation plate is fixedly installed on the outer side of the mold frame. The mounting plate is fixedly connected to the outer side of the heat insulation plate away from the mold frame. The driving device is fixedly installed on the mounting plate. The upper edge of the mounting plate protrudes from the upper edge of the heat insulation plate to form a protrusion. The pull rod has an integrally formed lug. The lug has at least one positioning hole. A positioning screw is installed in the positioning hole. The positioning screw can approach and abut against the protrusion to limit the maximum retraction distance of the pull rod.

10. The injection molding die as described in claim 1, characterized in that, The injection molding die further includes a mold frame pressure plate and at least one tie rod limiting block. A first mounting groove is provided on one side of the mold frame pressure plate, which penetrates the surface of the mold frame pressure plate, making the mold frame pressure plate as a whole U-shaped structure for accommodating the tie rod. A limiting groove is provided on the side of the tie rod away from the mold frame, and the tie rod limiting block is engaged in the limiting groove and fixedly connected to the mold frame pressure plate.

11. The injection molding die as described in claim 10, characterized in that, The injection molding die also includes a tie rod platen, which is fixedly installed on the mold frame platen of the upper mold and partially covers the surface of the tie rod away from the mold frame.

12. The injection molding die as described in claim 10, characterized in that, The mold frame pressure plate has a fourth mounting groove, which is located beside and communicates with the first mounting groove. The fourth mounting groove passes through the surface of the mold frame pressure plate, and the cross-section of the fourth mounting groove matches the cross-section of the connector.

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