Reverse prevention device for injection molding extrusion head

Abstract

The utility model discloses a kind of anti-reverse devices of injection molding extrusion head, including the injection molding cylinder for injection molding material extrusion, the injection molding head is installed on the extrusion port of injection molding cylinder, the inside of injection molding head is provided with the anti-backflow component for placing injection molding material backflow, anti-backflow component includes the sealing ring fixedly connected on the inner wall of injection molding head, the side of sealing ring movably is provided with sealing plate.The utility model controls the working condition of anti-backflow component by the pressure of injection molding material.When passing into injection molding material by injection molding cylinder, injection molding material generates extrusion to the sealing plate inside injection molding head, under the pressure effect of injection molding material, sealing plate is sealed from sealing ring, and compression is carried out to sleeve spring, so that injection molding material can be extruded from the center of sealing ring.The whole process does not need complicated rotation operation, just needs to rely on the pressure of injection molding material to realize extrusion function, operation is extremely simple, greatly reduces operation difficulty, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an anti-reverse device for an injection molding extruder. Background Technology

[0002] In injection molding, preventing backflow in the injection head is a critical factor affecting injection molding quality and efficiency. Backflow during extrusion can lead to defects in the molded product, such as uneven surfaces and internal air bubbles, severely impacting product quality and performance. Furthermore, backflow can cause malfunctions in the injection molding equipment, increasing maintenance costs and downtime, and reducing production efficiency.

[0003] Currently, there are some anti-reverse flow devices for injection molding heads on the market, such as the rotary anti-reverse flow device for injection molding heads disclosed in authorization (announcement) number: CN107553843B. This device includes a barrel, a guide, a pusher screw, and an anti-reverse flow ring. By rotating the pusher screw, the adjusting extrusion hole on the anti-reverse flow ring is misaligned or aligned with the extrusion port on the guide, thus preventing reverse flow of the injection molding material. When the pusher screw rotates, the adjusting extrusion hole is aligned with the extrusion port, allowing normal extrusion of the molding material; when the pusher screw stops rotating, the adjusting extrusion hole is misaligned with the extrusion port, preventing the molding material from flowing back into the barrel.

[0004] However, this rotary anti-reverse device has significant shortcomings in actual operation. Because it requires precise control of the screw's rotation angle to achieve accurate misalignment between the extrusion orifice and the extrusion nozzle, the operation is quite difficult. In actual production, it is difficult to guarantee that the extrusion orifice and extrusion nozzle are accurately misaligned every time. Inaccurate operation can lead to backflow of the injection molding material, failing to effectively achieve the anti-reverse function, thus affecting the quality of the injection molded products and the stability of production. Utility Model Content

[0005] The purpose of this invention is to provide an anti-reverse device for injection molding extrusion heads, which can achieve extrusion solely based on the injection pressure, without the need for complex rotation operations; the anti-reverse effect is reliable, and when the injection stops, the sleeve spring drives the sealing plate to quickly reset and block the hole, unaffected by the operating precision.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include: An anti-reverse device for an injection molding extruder head includes: An injection molding barrel for injection molding extrusion, wherein an injection head is installed on the extrusion port of the injection molding barrel, and the injection head is provided with an anti-backflow component for preventing the injection molding backflow.

[0007] The anti-backflow device for the above-mentioned injection molding extrusion head includes a sealing ring fixedly connected to the inner wall of the injection molding head, and a sealing plate that cooperates with the sealing ring is movably provided on the side of the sealing ring.

[0008] In the above-mentioned anti-reverse device for injection molding extrusion head, a sealing gasket matching the sealing ring is provided on the side of the sealing plate near the sealing ring.

[0009] The anti-backflow device for the above-mentioned injection molding extruder head further includes two limiting slide rods fixedly connected to the side of the sealing ring. Each of the two limiting slide rods is slidably connected to a limiting sleeve. The two limiting sleeves are fixedly connected to each other by a connecting rod. A connecting post is fixedly connected to the side of the connecting rod, and the other end of the connecting post is fixedly connected to the side of the sealing ring.

[0010] In the above-mentioned anti-reverse device for injection molding extrusion head, a connecting block is fixedly connected to the end of the limiting slide rod, and a sleeve spring is sleeved on the limiting slide rod located between the connecting block and the limiting slide sleeve.

[0011] In the above-mentioned anti-reverse device for injection molding extrusion head, an elastic sleeve is provided between the connecting block and the limiting sleeve and at the position corresponding to the sleeve spring, and one end of the elastic sleeve is fixedly connected to the side of the connecting block, and the other end of the elastic sleeve is fixedly connected to the side of the limiting sleeve.

[0012] In the aforementioned anti-reverse device for the injection molding extrusion head, a sealing sleeve matching the limiting slide rod is provided on the side of the limiting slide sleeve and at the position corresponding to the limiting slide rod.

[0013] This utility model has at least the following beneficial effects: 1. This utility model realizes an anti-reverse device for injection molding extrusion heads, which can achieve extrusion by relying solely on the injection pressure, without the need for complex rotation operations; the anti-reverse effect is reliable, and when the injection stops, the sleeve spring drives the sealing plate to quickly reset and block the hole, which is not affected by the operation precision.

[0014] 2. In this invention, the working state of the anti-backflow component is controlled by the pressure of the injection molding material. When the injection molding material is introduced through the injection cylinder, it squeezes the sealing plate inside the injection head. Under the pressure of the injection molding material, the sealing plate disengages from the sealing ring and compresses the spring, thereby extruding the injection molding material from the center of the sealing ring. The entire process requires no complex rotation operation; the extrusion function can be achieved solely by the pressure of the injection molding material. Operation is extremely simple, greatly reducing operational difficulty and improving production efficiency.

[0015] 3. In this invention, when the injection of plastic stops, the pressure of the injection plastic disappears. Under the elastic force of the sleeve spring, the sealing plate can quickly return to its original position and block the central hole of the sealing ring through the limiting slide rod on the side of the sealing plate, thereby effectively preventing the backflow of the injection plastic. This anti-reverse method is not affected by the precision of operation. As long as the injection of plastic stops, the sleeve spring will automatically drive the sealing plate to reset, realizing a reliable anti-reverse function and ensuring the quality of injection molded products and the stability of production.

[0016] 4. In this utility model, a sealing gasket matching the sealing ring is provided on the side of the sealing plate near the sealing ring. When the sealing plate blocks the central hole of the sealing ring under the elastic force of the sleeve spring, the sealing gasket can further enhance the sealing effect, effectively prevent leakage and backflow of the injection molding material, and improve the sealing performance and reliability of the injection molding process.

[0017] 5. In this utility model, a spring is sleeved on the limiting slide rod between the connecting block and the limiting slide sleeve, and an elastic sleeve is provided between the connecting block and the limiting slide sleeve at the position corresponding to the spring. The elastic sleeve can protect the spring, prevent the spring from being contaminated and damaged by the external environment during long-term use, extend the service life of the spring, and ensure the long-term stable operation of the anti-reverse device. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the anti-reverse device for the injection molding extrusion head of this utility model; Figure 2 This is a cross-sectional structural diagram of the anti-reverse device for the injection molding extrusion head of this utility model; Figure 3 This is a schematic diagram of the anti-backflow component in the anti-backflow device of the injection molding extruder head of this utility model; Figure 4 This is an exploded structural diagram of the anti-backflow component in the anti-backflow device of the injection molding extruder head of this utility model.

[0019] Explanation of icon numbers: 1. Injection molding cylinder; 2. Injection head; 3. Anti-backflow assembly; 301, sealing ring; 3011, sealing plate; 3012, sealing gasket; 302. Limiting slide bar; 3021. Limiting slide sleeve; 3022, connecting rod; 3023, connecting post; 3024, Sealing Sleeve; 303, connecting block; 3031, spring sleeve; 3032, elastic sleeve. Detailed Implementation

[0020] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0021] Please refer to Figures 1 to 4 As shown in the figure, an anti-backflow device for an injection molding extrusion head provided by an embodiment of the present invention includes: an injection molding cylinder 1 for injection molding extrusion, an injection molding head 2 installed on the extrusion port of the injection molding cylinder 1, and an anti-backflow component 3 for preventing the injection molding backflow is provided inside the injection molding head 2.

[0022] To achieve sealing and backflow prevention functions, in this embodiment, the backflow prevention component 3 includes a sealing ring 301 fixedly connected to the inner wall of the injection head 2, and a sealing plate 3011 movably disposed on the side of the sealing ring 301 to cooperate with it. The cooperation structure between the sealing ring 301 and the sealing plate 3011 is simple and effective. Under normal conditions, the sealing plate 3011 can tightly fit the sealing ring 301, forming a barrier to prevent the backflow of the injection molding material, effectively avoiding the backflow problem of the injection molding material in the non-extrusion state, and improving the stability of the injection molding process and product quality.

[0023] To enhance the sealing effect, in this embodiment, a sealing gasket 3012 matching the sealing ring 301 is provided on the side of the sealing plate 3011 near the sealing ring 301. The sealing gasket 3012 further improves the sealing performance. When the sealing plate 3011 and the sealing ring 301 are in contact, the sealing gasket 3012 can fill the tiny gap between them, forming a tighter seal, effectively preventing the injection molding material from leaking back from the gap, and further ensuring the reliability of the injection molding process.

[0024] To limit and guide the movement of the sealing plate 3011, in this embodiment, the anti-backflow assembly 3 further includes two limiting slide rods 302 fixedly connected to the side of the sealing ring 301. Each limiting slide rod 302 has a limiting sleeve 3021 slidably connected to it. The two limiting sleeves 3021 are fixedly connected by a connecting rod 3022. A connecting post 3023 is fixedly connected to the side of the connecting rod 3022, and the other end of the connecting post 3023 is fixedly connected to the side of the sealing ring 301. The cooperation of the limiting slide rods 302 and the limiting sleeves 3021 provides a precise track for the movement of the sealing plate 3011, ensuring that the sealing plate 3011 can only move within a specified range, guaranteeing accurate alignment between the sealing plate 3011 and the sealing ring 301, thereby improving the working accuracy and stability of the anti-backflow device. Simultaneously, the connecting rod 3022 and the connecting post 3023 enhance the strength and stability of the entire limiting structure.

[0025] To achieve automatic reset of the sealing plate 3011, in this embodiment: a connecting block 303 is fixedly connected to the end of the limiting slide rod 302, and a sleeve spring 3031 is sleeved on the limiting slide rod 302 located between the connecting block 303 and the limiting slide sleeve 3021. The sleeve spring 3031 enables the sealing plate 3011 to automatically reset after the injection pressure disappears, re-blocking the central hole of the sealing ring 301 and achieving the backflow prevention function. This automatic reset mechanism requires no additional power source, has a simple and reliable structure, reduces the complexity and cost of the equipment, and improves the working efficiency of the backflow prevention device.

[0026] To protect the spring 3031 and extend its service life, in this embodiment, an elastic sleeve 3032 is provided between the connecting block 303 and the limiting slide sleeve 3021, corresponding to the position of the spring 3031. One end of the elastic sleeve 3032 is fixedly connected to the side of the connecting block 303, and the other end of the elastic sleeve 3032 is fixedly connected to the side of the limiting slide sleeve 3021. The elastic sleeve 3032 can effectively prevent external dust, impurities, etc. from entering the interior of the spring 3031, avoiding corrosion and wear of the spring 3031, thereby extending the service life of the spring 3031 and ensuring the long-term stable operation of the anti-backflow device.

[0027] To improve the sealing performance and smooth sliding between the limiting sleeve 3021 and the limiting rod 302, in this embodiment: to enhance the sliding sealing performance, a sealing sleeve 3024 matching the limiting rod 302 is provided on the side of the limiting sleeve 3021 at a position corresponding to the limiting rod 302. The sealing sleeve 3024 not only reduces friction between the limiting sleeve 3021 and the limiting rod 302, improving the smoothness of sliding, but also prevents injection plastic from entering the gap between them, avoiding interference with the normal sliding of the limiting sleeve 3021 due to injection plastic residue, further improving the reliability and stability of the anti-backflow device.

[0028] The working principle of this invention is as follows: When injection plastic is introduced through the injection cylinder 1, the injection plastic exerts a squeezing effect on the sealing plate 3011 inside the injection head 2. Under the pressure of the injection plastic, the sealing plate 3011 moves along the limiting slide bar 302, disengaging from the sealing state of the sealing ring 301, and simultaneously compressing the sleeve spring 3031. At this time, the injection plastic can be smoothly extruded from the center of the sealing ring 301, completing the injection extrusion process. When the injection plastic stops, the pressure applied to the sealing plate 3011 disappears. Under the elastic force of the sleeve spring 3031, the sealing plate 3011 quickly returns to its original position and, through its side structure, tightly fits against the sealing ring 301, blocking the central hole of the sealing ring 301, thereby effectively preventing the injection plastic from flowing back and achieving a reliable anti-backflow function for the injection plastic.

[0029] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. An anti-reverse device for an injection molding extrusion head, comprising an injection molding cylinder (1) for injection molding material extrusion, characterized in that, An injection head (2) is installed on the extrusion port of the injection molding cylinder (1), and an anti-backflow component (3) for preventing the injection molding plastic from flowing back is provided inside the injection head (2).

2. The anti-reverse device for an injection molding extrusion head according to claim 1, characterized in that: The anti-backflow component (3) includes a sealing ring (301) fixedly connected to the inner wall of the injection head (2), and a sealing plate (3011) is movably provided on the side of the sealing ring (301) to cooperate with the sealing ring (301).

3. The anti-reverse device for an injection molding extruder head according to claim 2, characterized in that: The sealing plate (3011) has a sealing gasket (3012) that matches the sealing ring (301) on the side near the sealing ring (301).

4. The anti-reverse device for an injection molding extruder head according to claim 3, characterized in that: The anti-backflow assembly (3) further includes two limiting slide rods (302) fixedly connected to the side of the sealing ring (301). Each of the two limiting slide rods (302) is slidably connected to a limiting sleeve (3021). The two limiting sleeves (3021) are fixedly connected to each other by a connecting rod (3022). A connecting post (3023) is fixedly connected to the side of the connecting rod (3022), and the other end of the connecting post (3023) is fixedly connected to the side of the sealing ring (301).

5. The anti-reverse device for an injection molding extruder head according to claim 4, characterized in that: A connecting block (303) is fixedly connected to the end of the limiting slide rod (302), and a sleeve spring (3031) is sleeved on the limiting slide rod (302) located between the connecting block (303) and the limiting slide sleeve (3021).

6. The anti-reverse device for an injection molding extruder head according to claim 5, characterized in that: An elastic sleeve (3032) is provided between the connecting block (303) and the limiting sleeve (3021) and at the position corresponding to the sleeve spring (3031). One end of the elastic sleeve (3032) is fixedly connected to the side of the connecting block (303), and the other end of the elastic sleeve (3032) is fixedly connected to the side of the limiting sleeve (3021).

7. The anti-reverse device for an injection molding extruder head according to claim 6, characterized in that: A sealing sleeve (3024) matching the limiting slide rod (3022) is provided on the side of the limiting slide sleeve (3021) and at the position corresponding to the limiting slide rod (302).

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