A mechanical in-mold foaming and degassing device
Patent Information
- Application Number
- CN202621087938.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-17
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2036-07-17
AI Technical Summary
若气体无法顺利排出，会导致发泡产品内部产生暗泡、空洞、分层，表面出现缩坑、缺料等缺陷，严重影响产品质量和合格率
[0010]与现有技术相比，本实用新型的有益效果是：该装置采用纯机械结构，无需电、气能源，依托发泡料自身压力与复位弹簧实现自动排气及密封，结构简洁、故障率低、维护便捷；具备自适应压力感应与可调参数设计，适配PU、EVA、PE等多种材料及工艺需求；微型模块化设计体积小巧，安装便捷，无需大幅改造模具，适配各类模内发泡成型场景，可从源头消除暗泡、空洞等缺陷，提升产品合格率与质量稳定性。
Smart Images
Figure CN224702399U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold venting technology, specifically to a mechanical in-mold foaming venting device. Background Technology
[0002] During in-mold foaming, the foaming material expands within the mold cavity, generating a large amount of gas. Simultaneously, any residual air within the cavity must be expelled promptly. If the gas cannot be expelled smoothly, it can lead to defects such as hidden bubbles, voids, and delamination inside the foamed product, as well as shrinkage pits and material shortages on the surface, severely impacting product quality and yield.
[0003] Currently, in-mold foaming venting mainly employs the following methods: First, fixed venting grooves are opened on the mold parting surface. This method has a fixed venting gap, which is prone to incomplete venting, overflow, or groove blockage. Moreover, the venting effect is inconsistent and cannot adapt to different foaming pressures and rhythms. Second, manually operated venting needles are used, requiring manual opening or closing of the venting channel according to the foaming progress. This is not only labor-intensive but also difficult to control precisely, easily resulting in dark bubbles or overflow. Third, electrically controlled or pneumatically driven venting devices are used. These devices have complex structures, high costs, require external air and electrical circuits, have a high failure rate, and are inconvenient to maintain, making them difficult to adapt to the modification needs of most existing ordinary foaming molds. Utility Model Content
[0004] The purpose of this invention is to provide a mechanical in-mold foaming and venting device to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a mechanical in-mold foaming venting device, comprising a mounting base, an venting needle penetrating through the middle of the interior of the mounting base, an upper end of the venting needle having a sensing pressure bearing end, an venting channel opening at the middle of the lower end of the venting needle, an venting section at the upper end of the outer surface of the venting needle and at the lower end of the sensing pressure bearing end, an venting hole communicating with the venting channel on the outer surface of the venting needle, a limiting ring on the outer surface of the venting needle, an adjusting nut being threadedly connected to the lower interior of the mounting base, a return spring being provided on the outer surface of the venting needle between the limiting ring and the adjusting nut, and a mounting fixing seat being provided at the lower end of the outer surface of the mounting base.
[0006] Preferably, the mounting base has an exhaust port section in the middle of its interior, the exhaust pin is slidably connected to the exhaust port section, a sealing ring is provided between the outer surface of the exhaust pin and the exhaust port section, a sealing section is connected to the upper end of the mounting base and the exhaust port section, the pressure-bearing end cooperates with the sealing section, and a limit hole section is connected to the lower end of the mounting base and the exhaust port section, the limit ring is slidably connected to the limit hole section.
[0007] Preferably, the adjusting nut has a through hole at the middle position, the lower end of the venting needle is slidably connected to the through hole, and the adjusting nut has a rotating slot at the middle position and the connection to the through hole.
[0008] Preferably, the lower end of the limiting hole section is provided with a threaded section, and the adjusting nut is threadedly connected to the threaded section.
[0009] Preferably, a retaining ring is engaged between the outer surface of the exhaust needle and the inner surface of the limiting ring.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: The device adopts a purely mechanical structure, requiring no electric or pneumatic energy. It achieves automatic venting and sealing by relying on the pressure of the foaming material itself and the return spring. The structure is simple, the failure rate is low, and maintenance is convenient. It has adaptive pressure sensing and adjustable parameter design, adapting to various materials and process requirements such as PU, EVA, and PE. The micro-modular design is compact and easy to install, requiring no major modification to the mold. It is suitable for various in-mold foaming molding scenarios and can eliminate defects such as dark bubbles and voids from the source, improving product qualification rate and quality stability. Attached Figure Description
[0011] Figure 1 This is an isometric view of the main structure of this utility model; Figure 2 This is an isometric sectional view of the main structure of this utility model; Figure 3 This is an isometric sectional view of the exhaust structure of this utility model; Figure 4 This is a front sectional view of the main structure of this utility model; Figure 5 This is a front view sectional view of the main structure of this utility model in its installation state.
[0012] In the diagram: 1-Mounting base, 2-Exhaust pin, 3-Induction pressure bearing end, 4-Exhaust channel, 5-Exhaust section, 6-Exhaust hole, 7-Limit ring, 8-Adjusting nut, 9-Reset spring, 10-Mounting fixing seat, 11-Exhaust hole section, 12-Sealing ring, 13-Sealing section, 14-Limit hole section, 15-Through hole, 16-Rotating interlocking slot, 17-Threaded section, 18-Snap-fit ring, 19-Template, 20-Forming cavity, 21-Template support, 22-Exhaust opening. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Please see Figure 1-5 This utility model provides a mechanical in-mold foaming venting device, including a mounting base 1. A venting needle 2 is provided through the middle of the interior of the mounting base 1. The upper end of the venting needle 2 is provided with a pressure-bearing end 3. A venting channel 4 is provided at the middle of the lower end of the venting needle 2. A venting section 5 is provided at the upper end of the outer surface of the venting needle 2 and at the lower end of the pressure-bearing end 3. A venting hole 6 is connected to the venting channel 4 on the outer surface of the venting needle 2. A limiting ring 7 is provided on the outer surface of the venting needle 2. An adjusting nut 8 is threadedly connected to the lower end of the interior of the mounting base 1. A return spring 9 is provided on the outer surface of the venting needle 2 and between the limiting ring 7 and the adjusting nut 8. A mounting base 10 is provided at the lower end of the outer surface of the mounting base 1.
[0015] In use, the mounting base 1 is connected to the lower end of the template 19 via a splicing connection. The upper surface of the mounting base 1 corresponds to or slightly protrudes from the surface of the molding cavity 20. A mounting fixing seat 10 is set at the lower end of the outer surface of the mounting base 1. The mounting fixing seat 10 is spliced to the lower end of the template 19 via the template 21, thus fixing the mounting base 1 to the inside of the template 19. The venting pin 2 is slidably spliced inside the mounting base 1. A sensing pressure bearing end 3 is set at the upper end of the venting pin 2. A limiting ring 7 is set on the outer surface of the venting pin 2. A return spring 9 is set on the outer surface of the venting pin 2 via an adjusting nut 8. The adjusting nut 8 is threaded to the mounting base 1. The upper end of the return spring 9 abuts against the lower end of the limiting ring 7. The return spring 9 drives the venting pin 2 and the sensing pressure bearing end 3 to maintain an upward state. Before the foaming material comes into contact with the sensing pressure bearing end 3, the air inside the molding cavity 20 is vented through the venting pin 2. The material is discharged externally through the gap between the pressure-bearing end 3 and the mounting base 1, the exhaust section 5, the exhaust hole 6, and the exhaust channel 4. When the foam material comes into contact with the pressure-bearing end 3, the pressure on the exhaust needle 2 and the pressure-bearing end 3 increases, causing the exhaust needle 2 to move downward against the elastic force of the return spring 9. At this time, the pressure-bearing end 3 presses against the mounting base 1, closing the exhaust section 5 to prevent air and foam material from entering the interior of the exhaust hole 6 and the exhaust channel 4. An exhaust opening 22 is opened on the support template 21 at the position corresponding to the mounting base 1. The discharged gas is discharged externally through the exhaust opening 22. Tools such as screwdrivers can be inserted into the interior of the mounting base 1 through the exhaust opening 22 and connected to the adjusting nut 8. The adjusting nut 8 is rotated by the tool, thereby adjusting the force applied to the exhaust needle 2 by the return spring 9, thereby adjusting the pressure of the pressure-bearing end 3 and adapting to different foam materials.
[0016] An exhaust port section 11 is provided in the middle of the interior of the mounting base 1. The exhaust pin 2 is slidably connected to the exhaust port section 11. Through the connection between the exhaust pin 2 and the exhaust port section 11, the exhaust pin 2 is slidably connected to the interior of the mounting base 1. A sealing ring 12 is provided between the outer surface of the exhaust pin 2 and the exhaust port section 11 to improve the sealing performance between the exhaust pin 2 and the exhaust port section 11. A sealing section 13 is connected to the upper end of the mounting base 1 and the exhaust port section 11. The pressure-bearing end 3 cooperates with the sealing section 13. During exhaust, gas can be output to the outside through the gap between the pressure-bearing end 3 and the sealing section 13. After the foam contacts the inductive pressure bearing end 3, the inductive pressure bearing end 3 moves downward into the interior of the sealing section 13. The vent section 11 can be sealed by the close cooperation between the inductive pressure bearing end 3 and the sealing section 13. The lower end of the mounting base 1 is connected to the vent section 11 and the limiting hole section 14. The limiting ring 7 is slidably spliced with the limiting hole section 14. The limiting ring 7, the adjusting nut 8 and the return spring 9 are set inside the limiting hole section 14. When the upper end of the limiting ring 7 abuts against the upper end of the interior of the limiting hole section 14, it limits the upward movement of the inductive pressure bearing end 3, ensuring that the upper end of the inductive pressure bearing end 3 does not extend above the mounting base 1.
[0017] The adjusting nut 8 has a through hole 15 in the middle. The lower end of the venting needle 2 is slidably connected to the through hole 15. When the adjusting nut 8 is rotated, the lower end of the venting needle 2 extends into the interior of the adjusting nut 8 through the through hole 15. The position of the adjusting nut 8 will not interfere with the smooth up-and-down movement of the venting needle 2. The adjusting nut 8 has a rotating slot 16 in the middle and connected to the through hole 15. By connecting the tool to the rotating slot 16, the adjusting nut 8 can be rotated.
[0018] The lower end of the limiting hole section 14 is provided with a threaded section 17, and the adjusting nut 8 is threadedly connected to the threaded section 17. The adjusting nut 8 is threadedly connected to the limiting hole section 14 through the threaded section 17.
[0019] A retaining ring 18 is engaged between the outer surface of the exhaust needle 2 and the inner surface of the limiting ring 7. The limiting ring 7 is connected to the exhaust needle 2 through the retaining ring 18. While ensuring the connection between the limiting ring 7 and the exhaust needle 2, the limiting ring 7 can be set inside the limiting hole section 14 through the retaining ring 18 and engaged with the exhaust needle 2.
[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A mechanical in-mold foaming and degassing device, characterized in that: The device includes a mounting base (1), an exhaust needle (2) is provided through the middle of the interior of the mounting base (1), an inductive pressure bearing end (3) is provided at the upper end of the exhaust needle (2), an exhaust channel (4) is provided at the middle of the lower end of the exhaust needle (2), an exhaust section (5) is provided at the upper end of the outer surface of the exhaust needle (2) and at the lower end of the inductive pressure bearing end (3), an exhaust hole (6) is connected to the exhaust channel (4) on the outer surface of the exhaust needle (2), a limiting ring (7) is provided on the outer surface of the exhaust needle (2), an adjusting nut (8) is connected to the lower end of the interior of the mounting base (1) by a thread, a return spring (9) is provided on the outer surface of the exhaust needle (2) and between the limiting ring (7) and the adjusting nut (8), and a mounting fixing seat (10) is provided at the lower end of the outer surface of the mounting base (1).
2. The mechanical in-mold foaming and degassing device according to claim 1, characterized in that: The mounting base (1) has an exhaust hole section (11) in the middle of its interior. The exhaust needle (2) is slidably connected to the exhaust hole section (11). A sealing ring (12) is provided between the outer surface of the exhaust needle (2) and the exhaust hole section (11). The upper end of the mounting base (1) is connected to the exhaust hole section (11) by a sealing section (13). The pressure-bearing end (3) cooperates with the sealing section (13). The lower end of the mounting base (1) is connected to the exhaust hole section (11) by a limiting hole section (14). The limiting ring (7) is slidably connected to the limiting hole section (14).
3. The mechanical in-mold foaming and degassing device according to claim 1, characterized in that: The adjusting nut (8) has a through hole (15) in the middle position. The lower end of the exhaust needle (2) is slidably connected to the through hole (15). The adjusting nut (8) has a rotating slot (16) in the middle position and connected to the through hole (15).
4. The mechanical in-mold foaming and degassing device according to claim 2, characterized in that: The lower end of the limiting hole section (14) is provided with a threaded section (17), and the adjusting nut (8) is threadedly connected to the threaded section (17).
5. The mechanical in-mold foaming and degassing device according to claim 1, characterized in that: A retaining ring (18) is engaged between the outer surface of the exhaust needle (2) and the inner surface of the limiting ring (7).