Insert sealing integrated injection molding auxiliary device, molding mold and molding method

Abstract

The application discloses an insert sealing integrated injection molding auxiliary device, a molding mold and a molding method, relates to the technical field of injection molding, and comprises a fixed molding end cover and a centering guide module. The centering guide module is coaxially arranged with the fixed molding end cover. The fixed molding end cover is arranged in combination with an insert metal valve seat cover, and the inner wall of the fixed molding end cover can be abutted with the outer wall of the insert metal valve seat. The centering guide module is used for being threadedly connected with the inner wall of the center hole of the insert metal valve seat. The fixed molding end cover is located in the first cavity of a fixed mold, and the centering guide module can pass through the center hole of the insert metal valve seat and be used for being adaptively inserted and positioned with a guide hole of a movable mold. The application can position the insert metal valve seat during injection molding, ensure the centering of the overall molding of a plastic inner container, and limit the flow position of injection molding material to assist in the molding of the insert sealing injection inner container.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an auxiliary device, molding die, and molding method for integrated injection molding of insert seals. Background Technology

[0002] Hydrogen, as a clean energy source, is considered an important component of the future energy system. In recent years, with the development of hydrogen fuel cell vehicles, hydrogen storage cylinders have played a crucial role as the core power supply unit for these vehicles. Type IV compressed hydrogen cylinders, with their high hydrogen storage density and volumetric weight ratio, have become an important type of hydrogen storage cylinder under research and development. Type IV cylinders use a plastic inner liner as the hydrogen storage space, combined with an externally wound carbon fiber layer to achieve high-pressure hydrogen storage and transportation. The plastic inner liner consists of a metal valve seat and a plastic container, and its sealing structure plays a decisive role in the cylinder's storage and transportation process. Currently, the most common sealing structure for plastic inner liners is the combination of O-rings and retaining rings to form a seal between the metal valve seat and the inner plastic liner. However, this sealing structure is prone to retaining ring overflow during actual installation, causing seal failure. To solve this sealing failure problem, plastic inner liners can adopt an integrated insert sealing structure. This structure utilizes the metal valve seat and plastic to form a U-shaped seal, fundamentally avoiding the use of O-rings and retaining rings, effectively preventing seal failure, and also reducing processing steps, labor, and production costs. However, the integrated sealing structure of the insert has the problem of difficulty in positioning and centering the metal valve seat of the insert during the inner liner molding process, which seriously affects the injection molding of the plastic inner liner and has a huge impact on the production of the plastic inner liner.

[0003] In view of the problems existing in the prior art, those skilled in the art urgently need an auxiliary device, a molding die, and a molding method for integrated injection molding of insert seals. Summary of the Invention

[0004] The purpose of this invention is to provide an insert sealing integrated injection molding auxiliary device, molding die, and molding method to solve the problems existing in the prior art. It can play a positioning role for the insert metal valve seat during the injection molding process, ensure the centering of the plastic inner liner integral molding, and restrict the flow position of the injection molding material to assist in the molding of the insert sealing injection molding inner liner.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides an insert sealing integrated injection molding auxiliary device, including a fixed molding end cap and a centering guide module; the centering guide module is coaxially arranged with the fixed molding end cap; the fixed molding end cap has an inner cavity and one end is an open end, the fixed molding end cap is used to cover the insert metal valve seat, and the inner wall of the fixed molding end cap can be adapted to abut against the outer wall of the insert metal valve seat; one end of the centering guide module is correspondingly connected to the middle of the bottom wall of the fixed molding end cap, and the other end extends outward from the inner cavity; the centering guide module is used to be threadedly connected to the inner wall of the center hole of the insert metal valve seat; the fixed molding end cap is located in the first cavity of the fixed mold, and the centering guide module can pass through the center hole of the insert metal valve seat for fitting and positioning with the guide hole of the moving mold.

[0007] In some embodiments, the centering guide module includes a first threaded segment, a second threaded segment, and a guide rod segment; both ends of the first threaded segment are integrally connected to the second threaded segment and the guide rod segment, respectively; a positioning groove is recessed in the center of the inner bottom surface of the fixed molded end cap, and a through threaded hole is provided between the bottom surface of the positioning groove and the outer bottom surface of the fixed molded end cap; one end of the first threaded segment is positioned and connected to the positioning groove, and the second threaded segment is threadedly connected to the threaded hole; the first threaded segment is used to be threadedly connected to the inner wall of the center hole of the insert metal valve seat, and the guide rod segment is used to pass through the center hole of the insert metal valve seat and be fitted and positioned with the guide hole; the end face of the second threaded segment away from the first threaded segment is recessed and has a groove for rotating it.

[0008] In some embodiments, the inner wall of the fixed molded end cap includes a constant-diameter inner wall and a flared inner wall; the constant-diameter inner wall is used to abut against the outer wall of the bottle mouth of the insert metal valve seat at its maximum diameter; one end of the flared inner wall is smoothly connected to one end of the constant-diameter inner wall, and the other end extends to the outer edge of the opening end of the fixed molded end cap; and the inner diameter of the flared inner wall gradually increases from the end connected to the constant-diameter inner wall to the other end; at least a portion of the flared inner wall is adapted to fit against the outer wall of the shoulder of the insert metal valve seat.

[0009] In some embodiments, a sealing groove is provided on the shoulder edge of the insert metal valve seat; a gap is provided between one end of the inner wall of the flared section and the sealing groove located on the shoulder edge of the insert metal valve seat, the gap being used to allow molten resin to pass through and flow into the sealing groove during the molding of the plastic inner liner body.

[0010] In some embodiments, the outer wall cross-section of the fixed molded end cap has a trapezoidal structure and includes an outer bottom surface and an outer conical surface; the small diameter end of the outer conical surface is smoothly connected to the outer bottom surface, and the large diameter end extends to the edge of the opening end of the fixed molded end cap; the outer bottom surface is used to abut and limit the positioning step of the fixed mold.

[0011] In some embodiments, the diameter of the guide rod segment is smaller than the outer diameter of the first threaded segment; and / or the outer diameter of the second threaded segment is smaller than the outer diameter of the first threaded segment.

[0012] In some embodiments, the guide rod segment includes a straight rod portion and a guide portion; one end of the straight rod portion is integrally connected to the first threaded segment, and the other end is integrally connected to the guide portion, and the diameter of the guide portion gradually decreases from the end connected to the straight rod portion to the other end.

[0013] The present invention also provides an insert sealing integrated injection molding die, including a moving mold, a fixed mold, and the above-mentioned insert sealing integrated injection molding auxiliary device; the fixed mold includes a first cavity, a positioning step, and a resin flow channel; the moving mold includes a guide hole, and a second cavity for molding a plastic inner liner body is formed between the fixed mold and the moving mold; the two ends of the first cavity are connected to the second cavity and the resin flow channel, respectively; the positioning step is formed by protruding sidewalls of the first cavity; a fixed molding end cap is located in the first cavity, and the positioning step abuts and limits the outer wall of the fixed molding end cap; a centering guide module is adapted to be inserted into the guide hole, and the centering guide module can abut and limit the end of the guide hole.

[0014] In some embodiments, a stepped portion is formed at the connection between the first threaded section and the guide rod section of the centering guide module, the stepped portion being used to abut and limit the end of the guide hole; the distance between the sidewall of the first cavity and the outer conical surface of the fixed molded end cap gradually decreases from the direction away from the second cavity to the direction closer to the second cavity.

[0015] This invention also provides a method for integral injection molding of insert seals, using the aforementioned integral injection molding mold for insert seals, comprising the following steps: before injection molding, a fixed molding end cap is fitted onto the insert metal valve seat; a centering guide module is threadedly connected to the inner wall of the center hole of the insert metal valve seat, and the centering guide module is fitted and positioned with the guide hole of the moving mold; the fixed mold and the moving mold are closed, and the positioning step of the fixed mold abuts against the outer wall of the fixed molding end cap; injection molding is started, and molten resin is injected into the first cavity through the resin flow channel and into the second cavity through the first cavity, filling the second cavity with the molten resin to form the plastic inner liner body; after the plastic inner liner body has completely cooled, the fixed mold and the moving mold are opened, the plastic inner liner is removed and the sprue is removed; the fixed molding end cap and the centering guide module are separated from the insert metal valve seat, completing the integral injection molding of the insert seal.

[0016] The present invention achieves the following technical effects compared to the prior art:

[0017] The insert sealing integrated injection molding auxiliary device, molding die, and molding method of the present invention involve fitting a fixed molding end cap onto an insert metal valve seat, and a centering guide module coaxially arranged with the fixed molding end cap. During the injection molding process, the insert metal valve seat is first fixed to the centering guide module through a threaded structure to form a positioning and centering structure. Then, the centering guide module is fitted and inserted into the guide hole of the moving mold for positioning. During the injection molding process, this auxiliary device plays a role in positioning and centering the insert metal valve seat, ensuring the centering of the overall molding of the plastic liner. Furthermore, during injection molding, the fixed molding end cap of the present invention, located in the first cavity of the fixed mold, can restrict the flow position of the injection molding material, assisting in the molding of the insert sealing injection molding liner, while ensuring the designed shape of the plastic liner. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional view of an insert sealing integrated injection molding die in some embodiments of the present invention;

[0020] Figure 2 This is a cross-sectional view showing the connection between the insert sealing integrated injection molding auxiliary device and the insert metal valve seat and plastic inner liner body in some embodiments of the present invention.

[0021] Figure 3 for Figure 2 Exploded view;

[0022] Figure 4 This is a schematic diagram of the structure of the insert sealing integrated injection molding auxiliary device, the insert metal valve seat, and the plastic inner liner body before connection in some embodiments of the present invention;

[0023] Figure 5 This is a flowchart of the main steps of the insert sealing integrated injection molding method in some embodiments of the present invention.

[0024] In the diagram: 1-Fixed molded end cap; 2-Centering guide module; 3-Resin flow channel; 4-Positioning step; 5-Insert metal valve seat; 6-Fixed mold; 7-Moving mold; 8-Guide hole; 9-Plastic inner liner body; 10-First cavity; 11-Bottom wall; 12-Positioning groove; 13-Threaded hole; 14-Inner wall of equal diameter section; 15-Inner wall of flared section; 21-First threaded section; 22-Second threaded section; 23-Guide rod section; 24-Groove; 25-Step section; 51-Center hole; 52-Bottle mouth section; 53-Shoulder section; 54-Sealing groove; 231-Straight rod section; 232-Guide section. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The purpose of this invention is to provide an insert sealing integrated injection molding auxiliary device, molding die, and molding method to solve the problems existing in the prior art. It can play a positioning role for the insert metal valve seat during the injection molding process, ensure the centering of the plastic inner liner integral molding, and restrict the flow position of the injection molding material to assist in the molding of the insert sealing injection molding inner liner.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] This invention provides an auxiliary device for integrated injection molding of insert seals, such as... Figures 1 to 4 As shown, it includes a fixed molded end cap 1 and a centering guide module 2; wherein, the fixed molded end cap 1 has an inner cavity and one end is an open end, the fixed molded end cap 1 and the centering guide module 2 are coaxially arranged, one end of the centering guide module 2 is correspondingly connected to the middle of the bottom wall 11 of the fixed molded end cap 1, and the other end extends out of the inner cavity and extends outward.

[0029] The molding auxiliary device of the present invention is used to form a positioning and centering structure with the insert metal valve seat 5; wherein, the fixed molding end cap 1 is used to cover the insert metal valve seat 5, and the inner wall of the fixed molding end cap 1 can be adapted to abut against the outer wall of the insert metal valve seat 5; the insert metal valve seat 5 has a through central hole 51, the inner wall of the central hole 51 is provided with an internal thread, the centering guide module 2 is provided with an external thread and is used to be threadedly connected to the inner wall of the central hole 51 of the insert metal valve seat 5; and, the fixed molding end cap 1 is located in the first cavity 10 of the fixed mold 6, and the centering guide module 2 can pass through the central hole 51 of the insert metal valve seat 5 and is used to be adapted to be inserted and positioned with the guide hole 8 of the moving mold 7 of the injection molding machine.

[0030] In some embodiments, such as Figure 3 As shown, the centering guide module 2 includes a first threaded section 21, a second threaded section 22, and a guide rod section 23; the two ends of the first threaded section 21 are integrally connected to the second threaded section 22 and the guide rod section 23, respectively.

[0031] A positioning groove 12 is recessed in the middle of the inner bottom surface of the fixed molded end cap 1. A through threaded hole 13 is provided between the bottom surface of the positioning groove 12 and the outer bottom surface of the fixed molded end cap 1. One end of the first threaded section 21 is positioned and connected to the positioning groove 12, and the second threaded section 22 is threadedly connected to the threaded hole 13. The first threaded section 21 is used to be threadedly connected to the inner wall of the center hole 51 of the insert metal valve seat 5, and the guide rod section 23 is used to pass through the center hole 51 of the insert metal valve seat 5 and be fitted and positioned with the guide hole 8.

[0032] The end face of the second threaded segment 22 away from the first threaded segment 21 is recessed to form a groove 24 for rotating it. This groove 24 can be an internal hexagonal groove.

[0033] It should be noted that the embodiment of the present invention is illustrated by taking the threaded connection and fixing of the centering guide module 2 and the fixed molding end cap 1 as an example. Those skilled in the art can also use other connection methods to position and connect the centering guide module 2 and the fixed molding end cap 1, such as using fasteners for connection and fixing. The present invention does not make specific limitations on this, as long as it can ensure that the fixed molding end cap 1 and the centering guide module 2 are coaxially aligned.

[0034] In some embodiments, such as Figure 2 and Figure 3As shown, the inner wall of the fixed molded end cap 1 includes a constant diameter section inner wall 14 and a flared section inner wall 15; wherein, the constant diameter section inner wall 14 is used to abut against the maximum diameter of the outer wall of the bottle mouth portion 52 of the insert metal valve seat 5, one end of the flared section inner wall 15 is smoothly connected to one end of the constant diameter section inner wall 14, and the other end extends to the outer edge of the opening end of the fixed molded end cap 1, and the inner diameter of the flared section inner wall 15 gradually increases from the end connected to the constant diameter section inner wall 14 to the other end; at least a portion of the flared section inner wall 15 is adapted to fit against the outer wall of the shoulder portion 53 of the insert metal valve seat 5.

[0035] It should be noted that the inner diameter of the equal-diameter section inner wall 14 of the present invention is equal at all points along the axial direction, and the flared section inner wall 15 has a trumpet-shaped structure; the end face of the insert metal valve seat 5 abuts against the inner bottom surface of the fixed molded end cap 1, the outer periphery of the insert metal valve seat 5 includes a bottle mouth portion 52 and a shoulder portion 53, and the junction of the bottle mouth portion 52 and the shoulder portion 53 is smoothly connected by an arc, the bottle mouth portion 52 corresponds to the equal-diameter section inner wall 14, and the maximum diameter of the bottle mouth portion 52 abuts against the equal-diameter section inner wall 14 to ensure that the fixed molded end cap 1 can cover the insert metal valve seat 5; and a part of the flared section inner wall 15 is adapted to fit and fit against the shoulder portion 53, so that the fixed molded end cap 1 and the insert metal valve seat 5 of the present invention are in a positioning and centering position.

[0036] In some embodiments, such as Figure 3 As shown, a sealing groove 54 is provided on the edge of the shoulder 53 of the insert metal valve seat 5; a gap is provided between one end of the inner wall 15 of the flared section and the sealing groove 54 located on the edge of the shoulder 53 of the insert metal valve seat 5, which is used to allow molten resin to pass through and flow into the sealing groove 54 during the molding of the plastic inner liner body 9.

[0037] It should be noted that the insert metal valve seat 5 of the present invention is provided with a groove structure on the side away from the fixed molded end cap 1 and on the inner wall of the center hole 51 of the insert metal valve seat 5. The insert metal valve seat 5 forms a loop-shaped sealing structure with the plastic inner liner body 9 through the sealing groove 54 and multiple groove structures.

[0038] In some embodiments, the outer wall cross-section of the fixed molded end cap 1 is trapezoidal and includes an outer bottom surface and an outer conical surface; wherein, the outer bottom surface is a planar structure, one end of the outer conical surface is a small diameter end and is smoothly connected to the outer bottom surface, and the other end is a large diameter end and extends to the edge of the opening end of the fixed molded end cap 1; the outer bottom surface is used to abut and limit the positioning step 4 of the fixed mold 6.

[0039] In some embodiments, the diameter of the guide rod segment 23 is smaller than the outer diameter of the first threaded segment 21; and / or the outer diameter of the second threaded segment 22 is smaller than the outer diameter of the first threaded segment 21.

[0040] In some embodiments, such as Figure 2As shown, the guide rod segment 23 includes a straight rod portion 231 and a guide portion 232; wherein, one end of the straight rod portion 231 is integrally connected to the first threaded segment 21, and the other end is integrally connected to the guide portion 232, and the diameter of the guide portion 232 gradually decreases from the end connected to the straight rod portion 231 to the other end. The present invention facilitates insertion and connection with the guide hole 8 by providing the guide portion 232.

[0041] This invention also provides an insert sealing integrated injection molding mold, such as Figure 1 As shown, it includes a moving mold 7, a fixed mold 6, and the aforementioned insert sealing integrated injection molding auxiliary device; wherein, the fixed mold 6 includes a first cavity 10, a positioning step 4, and a resin flow channel 3, the moving mold 7 includes a guide hole 8, and a second cavity for molding the plastic inner liner body 9 is formed between the fixed mold 6 and the moving mold 7; the resin flow channel 3 is connected to the first cavity 10, and the first cavity 10 is connected to the second cavity.

[0042] The inner wall of the first cavity 10 protrudes to form a positioning step 4, and the fixed molding end cap 1 is located inside the first cavity 10, with the positioning step 4 abutting and limiting the outer wall of the fixed molding end cap 1; such as Figure 1 As shown, the outlet end of the resin flow channel 3 of the present invention is located in the middle of the positioning step 4, and the outlet end is connected to the first cavity 10.

[0043] The centering guide module 2 is adapted to be inserted into the guide hole 8, and the centering guide module 2 can be abutted and limited at the end of the guide hole 8.

[0044] In some embodiments, such as Figure 1 and Figure 3 As shown, a stepped portion 25 is formed at the connection between the first threaded section 21 of the centering guide module 2 and the guide rod section 23. The stepped portion 25 is used to abut and limit the end of the guide hole 8.

[0045] In some embodiments, such as Figure 1 As shown, the distance between the first cavity 10 and the outer conical surface of the fixed molding end cap 1 gradually decreases in the direction from away from the second cavity to closer to the second cavity. This invention, through the fixed molding end cap 1, can restrict the flow position of the injection molding material, assisting in the sealing and molding of the injection-molded inner liner while ensuring the designed shape of the plastic inner liner.

[0046] This invention also provides an integral injection molding method for insert sealing, such as... Figure 5 As shown, it includes the following steps:

[0047] Step S1: Before injection molding, the fixed molding end cap 1 is placed on the insert metal valve seat 5, the centering guide module 2 is threaded to the inner wall of the center hole 51 of the insert metal valve seat 5, and the centering guide module 2 is fitted and inserted into the guide hole 8 of the moving mold 7 for positioning.

[0048] Step S2: Control the fixed mold 6 and the moving mold 7 to close, and make the positioning step 4 of the fixed mold 6 abut against the outer wall of the fixed molding end cap 1;

[0049] Step S3: Start injection molding, inject molten resin into the first cavity 10 through the resin flow channel 3 and into the second cavity through the first cavity 10, and fill the second cavity with molten resin to injection mold the plastic inner liner body 9;

[0050] Step S4: After the plastic inner liner body 9 has completely cooled down, control the fixed mold 6 and the moving mold 7 to open the mold, remove the plastic inner liner and remove the sprue;

[0051] Step S5: Separate the fixed molded end cap 1 and the centering guide module 2 from the insert metal valve seat 5 to complete the integrated injection molding of the insert seal.

[0052] The plastic inner liner of the present invention includes an insert metal valve seat 5 and a plastic inner liner body 9. During the injection molding process of the plastic inner liner, the fixed molding end cap 1 is connected to the top thread of the centering guide module 2 and then connected to the insert metal valve seat 5. The tooling formed by the combination is installed in the front mold of the injection mold, and then injection molding is performed to form the insert sealing injection molding inner liner. Finally, the insert sealing integrated injection molding auxiliary molding structure is separated from the insert metal valve seat 5 by the internal hexagonal structure at the top of the centering guide module 2 to complete the injection molding production.

[0053] The working process of the insert sealing integrated injection molding mold of the present invention is as follows:

[0054] Before injection molding, the fixed molding end cap 1 is covered with the insert metal valve seat 5, and the external thread of the centering guide module 2 is tightened clockwise to connect and fix the internal thread of the insert metal valve seat 5.

[0055] Insert the guide rod segment 23 of the centering guide module 2 into the guide hole 8 of the moving mold 7 of the injection mold;

[0056] Start the injection molding machine mold closing button, and the injection molding machine begins to close the mold. After the mold is closed, the positioning step 4 of the fixed mold 6 contacts the fixed molding end cap 1, and the fixed molding end cap 1 together with the insert metal valve seat 5 is tightly fixed between the fixed mold 6 and the moving mold 7.

[0057] The injection molding machine starts injection molding, injecting molten resin into the mold cavity. The resin flows along the resin flow channel 3 to the outer surface of the fixed molding end cap 1, and fills the entire inner liner along the arch of the plastic inner liner body 9.

[0058] After the inner liner has cooled down, the injection molding machine opens the mold, ejects the product, and removes it.

[0059] Cut off and remove the material head along the arched junction of the fixed molded end cap 1 and the plastic inner liner body 9;

[0060] Using an Allen wrench connected to the Allen groove 24 on the centering guide module 2, the fixed molded end cap 1 and the centering guide module 2 are unscrewed counterclockwise as a whole, leaving the insert metal valve seat 5 at the opening of the plastic inner liner body 9, thus completing the insert sealing integrated injection molding auxiliary molding.

[0061] It should be noted that the material head in this invention refers to the portion formed between the molten resin filling the first cavity 10 and the fixed molded end cap 1.

[0062] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An insert sealing integrated injection molding auxiliary device, characterized in that, Includes a fixed molded end cap and a centering guide module; The centering guide module is coaxially arranged with the fixed molded end cap; The fixed molded end cap has an inner cavity and one end is an open end. The fixed molded end cap is used to cover the insert metal valve seat, and the inner wall of the fixed molded end cap can be adapted to abut against the outer wall of the insert metal valve seat. One end of the centering guide module is connected to the middle of the bottom wall of the fixed molded end cap, and the other end extends outward from the inner cavity. The centering guide module is used to be threadedly connected to the inner wall of the center hole of the insert metal valve seat; the fixed molding end cap is located in the first cavity of the fixed mold, and the centering guide module can pass through the center hole of the insert metal valve seat for fitting and positioning with the guide hole of the moving mold. The inner wall of the fixed molded end cap includes an inner wall with a constant diameter section and an inner wall with a flared section. The inner wall of the equal diameter section is used to abut against the outer wall of the bottle mouth of the insert metal valve seat at the maximum diameter. One end of the inner wall of the flared section is smoothly connected to one end of the inner wall of the equal diameter section, and the other end extends to the outer edge of the opening end of the fixed molded end cap. The inner diameter of the inner wall of the flared section gradually increases from the end connected to the inner wall of the equal diameter section to the other end. At least a portion of the inner wall of the flared section is adapted to fit against the outer wall of the shoulder of the insert metal valve seat; The outer wall cross-section of the fixed molded end cap has a trapezoidal structure and includes an outer bottom surface and an outer conical surface; The small-diameter end of the outer conical surface is smoothly connected to the outer bottom surface, and the large-diameter end extends to the edge of the opening end of the fixed molded end cap; the outer bottom surface is used to abut and limit the positioning step of the fixed mold.

2. The insert sealing integrated injection molding auxiliary device according to claim 1, characterized in that, The centering guide module includes a first threaded section, a second threaded section, and a guide rod section; The two ends of the first threaded segment are integrally connected to the second threaded segment and the guide rod segment, respectively; A positioning groove is recessed in the middle of the inner bottom surface of the fixed molded end cap. A through threaded hole is provided between the bottom surface of the positioning groove and the outer bottom surface of the fixed molded end cap. One end of the first threaded segment is positioned and connected to the positioning groove, and the second threaded segment is threadedly connected to the threaded hole. The first threaded section is used to be threaded to the inner wall of the center hole of the insert metal valve seat, and the guide rod section is used to pass through the center hole of the insert metal valve seat and be fitted and positioned with the guide hole; The end face of the second threaded segment away from the first threaded segment is recessed to form a groove for rotating it.

3. The insert sealing integrated injection molding auxiliary device according to claim 1, characterized in that, The shoulder edge of the insert metal valve seat is provided with a sealing groove; A gap is provided between one end of the inner wall of the flared section and the sealing groove located at the edge of the shoulder of the insert metal valve seat. The gap is used to allow molten resin to pass through and flow into the sealing groove during the molding of the plastic inner liner body.

4. The insert sealing integrated injection molding auxiliary device according to claim 2, characterized in that, The diameter of the guide rod segment is smaller than the outer diameter of the first threaded segment; and / or The outer diameter of the second threaded section is smaller than that of the first threaded section.

5. The insert sealing integrated injection molding auxiliary device according to claim 2, characterized in that, The guide rod segment includes a straight rod section and a guide section; One end of the straight rod is integrally connected to the first threaded section, and the other end is integrally connected to the guide portion, wherein the diameter of the guide portion gradually decreases from the end connected to the straight rod to the other end.

6. An insert sealing integrated injection molding mold, characterized in that, Includes a moving mold, a fixed mold, and an insert sealing integrated injection molding auxiliary device as described in any one of claims 1-5; The fixed mold includes a first cavity, a positioning step, and a resin flow channel. The moving mold includes a guide hole, and a second cavity for molding a plastic inner liner body is formed between the fixed mold and the moving mold. The two ends of the first cavity are connected to the second cavity and the resin flow channel, respectively. The first cavity has a protruding positioning step on its side wall, the fixed molding end cap is located in the first cavity, and the positioning step abuts against and limits the outer wall of the fixed molding end cap. The centering guide module is adapted to be inserted into the guide hole, and the centering guide module can abut and limit the end of the guide hole.

7. The insert sealing integrated injection molding mold according to claim 6, characterized in that, A stepped portion is formed at the connection between the first threaded section and the guide rod section of the centering guide module, and the stepped portion is used to abut and limit the end of the guide hole; The distance between the sidewall of the first cavity and the outer conical surface of the fixed molded end cap gradually decreases from the direction away from the second cavity to the direction closer to the second cavity.

8. A method for integral injection molding of an insert seal, characterized in that, The method of using the insert sealing integrated injection molding mold as described in claim 6 includes the following steps: Before injection molding, the fixed molding end cap is placed on the insert metal valve seat, the centering guide module is threaded to the inner wall of the center hole of the insert metal valve seat, and the centering guide module is fitted and positioned with the guide hole of the moving mold. Control the closing of the fixed mold and the moving mold, and place the positioning step of the fixed mold against the outer wall of the fixed molded end cap; Injection molding is started, and molten resin is injected into the first cavity through the resin channel and then into the second cavity through the first cavity. The molten resin fills the second cavity and is injection molded to form the plastic inner liner body. After the plastic inner liner body has completely cooled down, control the fixed mold and the moving mold to open, remove the plastic inner liner and remove the sprue; Separate the fixed end cap and the centering guide module from the insert metal valve seat to complete the integrated injection molding of the insert seal.

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