Anti-overflow UPVC (Unplasticized Polyvinyl Chloride) needle valve hot runner structure

Abstract

The utility model relates to the technical field of hot runner structures, in particular to an anti-overflow UPVC (Unplasticized Polyvinyl Chloride) needle valve hot runner structure. The structure comprises a hot runner splitter plate provided with a valve needle via hole and a runner hole which are separated from each other; the hot nozzle is connected with the hot runner splitter plate, a glue outlet is formed in the bottom of the hot nozzle, and the valve needle via hole and the runner hole penetrate through the hot nozzle and intersect at the glue outlet; the valve needle is used for being installed in the valve needle via hole so as to control flowing of the plastic melt in the hot runner structure; and the high-temperature sealing element is mounted in the valve needle via hole and is close to the glue outlet, so that volatile gas is prevented from entering the valve needle via hole, the valve needle is tightly held, and the valve needle is secondarily positioned. According to the utility model, the improvement and upgrading of the existing hot runner structure are completed, and the technical problems that the valve needle hole is blocked and the valve needle is blackened due to the volatilization of an additive in UPVC (Unplasticized Polyvinyl Chloride) in the prior art and the production schedule is influenced are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner structures, in particular to an overflow-proof UPVC needle valve hot runner structure. Background Art

[0002] The needle valve hot runner system primarily consists of a needle valve, nozzle, runner plate, and heater. Its operating principle is to precisely control the flow of molten plastic during the injection molding process by controlling the opening and closing of the needle valve, thereby ensuring product precision and consistency. However, during injection molding, the cylinder needle valve often becomes stuck due to thermal expansion and contraction of the hot runner plate. Alternatively, when the cylinder needle valve is retracted, the retracted cylinder needle valve still partially blocks the runner hole, resulting in poor flow and preventing the injection molding process from proceeding properly.

[0003] In response to the above-mentioned problems, the utility model patent document with authorization announcement number CN201728802U discloses an inclined hole inlet needle valve, which is used in the hot runner of an injection mold and includes a hot runner plate, a hot nozzle and a cylinder valve needle. The hot runner plate is provided with a valve needle hole and a hot runner hole that are separated from each other. The hot nozzle is fixed to the hot runner plate and is provided with an inclined hole that communicates with the hot runner hole. The valve needle hole and the nozzle hole are coaxially connected, and the cylinder valve needle extends into the valve needle hole and the nozzle hole. The above-mentioned inclined hole inlet needle valve is separated from the valve needle hole by making the hot runner hole at the corner of the diverter plate separate from the valve needle hole. This not only prevents the cylinder valve needle from being stuck by the hot runner plate due to thermal expansion and contraction of the hot runner plate, but also facilitates the flow of plastic in the runner hole, ensuring the normal progress of the injection molding process.

[0004] However, when the above-mentioned inclined hole injection needle valve is used for injection molding, the valve needle and the flow channel in the hot nozzle are still in the same hole. The plastic will adhere to the valve needle to form a wrapping layer, which will hinder the flow of plastic and generate a large shear force, causing the plastic parts to turn yellow. In addition, for UPVC (unplasticized polyvinyl chloride), the additives such as paraffin and vegetable oil it contains will generate volatile gases after heating. When the inclined hole injection needle valve is used for injection molding, these volatile gases will condense and accumulate in the valve needle hole and turn black, causing the valve needle hole to be blocked and the valve needle to be stained black. Black lines on the glue mouth and the valve needle to get stuck are likely to occur. The valve needle and the valve needle hole need to be cleaned after each cycle of plastic, which seriously affects the production progress. Utility Model Content

[0005] The utility model provides an overflow-proof UPVC needle valve hot runner structure to solve the technical problem in the prior art that volatilization of additives in UPVC leads to blockage of valve needle holes and blackening of valve needles, thus affecting production progress.

[0006] In order to solve the above problems, the anti-overflow UPVC needle valve hot runner structure provided by the present invention adopts the following technical solutions:

[0007] An anti-overflow UPVC needle valve hot runner structure, comprising:

[0008] A hot runner manifold having separate valve needle holes and runner holes;

[0009] A hot nozzle is connected to the hot runner manifold, and a glue outlet is provided at the bottom of the hot nozzle. The valve needle through hole and the runner hole pass through the hot nozzle and meet at the glue outlet;

[0010] A valve needle, which is used to be installed in the valve needle through hole to control the flow of plastic melt in the hot runner structure;

[0011] A high-temperature seal is installed in the valve needle through hole and close to the glue outlet to prevent volatile gas from entering the valve needle through hole, and to hold the valve needle tightly to perform secondary positioning of the valve needle.

[0012] The beneficial effects of the anti-overflow UPVC needle valve hot runner structure provided by the present invention are: by arranging a high-temperature seal in the valve needle through-hole, the excellent sealing performance of the high-temperature seal component is used to prevent the volatile gas in the plastic melt from entering the valve needle through-hole, thereby preventing the volatile gas from entering the valve needle through-hole and causing the valve needle surface to turn black, and the volatile gas from solidifying in the valve needle through-hole and clogging the valve needle through-hole, resulting in the generation of black lines at the glue port and valve needle jamming; at the same time, the high-temperature seal can also hold the valve needle tightly, playing a secondary positioning role for the valve needle; the valve needle through-hole is completely separated from the runner hole, and only intersects at the glue outlet. During injection molding, the valve needle exits the glue outlet to keep the runner unobstructed. In summary, the present invention itself completes the improvement and upgrade of the existing hot runner structure, and effectively solves the technical problem in the prior art that the volatilization of additives in UPVC causes the valve needle hole to be blocked, the valve needle is stained black, and affects the production progress.

[0013] Furthermore, the high-temperature seal is a flood seal assembly.

[0014] Furthermore, the pan-seal assembly includes a pan-seal carrier installed in the valve needle through-hole, and a pan-seal installed on the pan-seal carrier.

[0015] Beneficial effects: The pan-seal has the following advantages: 1) The sealing performance of the pan-seal is not affected by insufficient lubrication during startup, and can effectively reduce the wear and friction resistance of the valve needle when passing through; 2) The pan-seal has a wide range of applications, and it can exhibit different sealing forces to meet various application requirements; 3) The pan-seal is dimensionally stable, and its chemical corrosion resistance and heat resistance are better than those of commonly used sealing rubbers; 4) The pan-seal does not experience volume expansion, thereby avoiding the problem of deterioration of sealing performance due to volume expansion; 5) The sealing material of the pan-seal is polytetrafluoroethylene, which will not cause pollution to the medium; 6) The friction coefficient of the pan-seal is extremely low, and it is very smooth even in extremely low-speed applications, and there will be no stick-slip effect; 7) The starting friction resistance of the pan-seal is small, and it can maintain low starting force performance even in the case of long downtime or intermittent operation.

[0016] Furthermore, the material of the pan-seal carrier is 2316 steel, and it has a valve needle channel for the valve needle to pass through.

[0017] Furthermore, a valve sleeve is installed in the valve needle through hole to protect the valve needle and improve the sealing performance of the hot runner structure.

[0018] Furthermore, the valve needle through hole is a vertical hole, which includes a large diameter section and a small diameter section. The large diameter section is sequentially installed with the valve sleeve and the high-temperature seal from top to bottom, and the end of the small diameter section away from the large diameter section is connected to the glue outlet.

[0019] Furthermore, a support column is installed in the valve needle through hole, and the support column is located between the valve sleeve and the high-temperature sealing component to provide support for the valve sleeve. The middle part of the support column has a through hole for the valve needle to pass through.

[0020] Furthermore, the runner hole is obliquely arranged in the hot runner manifold and the hot nozzle, and includes a large diameter section and a small diameter section, and one end of the small diameter section away from the large diameter section is connected to the glue outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the anti-overflow UPVC needle valve hot runner structure provided by the utility model;

[0023] Figure 2 A schematic diagram of the internal structure of the hot nozzle of the anti-overflow UPVC needle valve hot runner structure provided by the present invention;

[0024] Figure 3 This is an exploded view of the hot nozzle of the anti-overflow UPVC needle valve hot runner structure provided by the utility model.

[0025] Description of reference numerals:

[0026] 1. Hot runner manifold; 2. Valve needle through hole; 3. Runner hole; 4. Hot nozzle; 5. Glue outlet; 6. Valve needle; 7. Pan seal carrier; 8. Pan seal; 9. Valve sleeve; 10. Support column. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be noted that the main idea of ​​the anti-overflow UPVC needle valve hot runner structure provided by the present invention is: installing a high-temperature seal in the valve needle through-hole can prevent volatile gases formed by heated substances such as oil and fillers in the plastic melt from entering the valve needle through-hole, thereby avoiding volatile gases entering the valve needle through-hole and causing the valve needle surface to turn black, and clogging the valve needle through-hole after solidification, resulting in black lines on the glue mouth and valve needle jamming.

[0029] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0030] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0031] Example 1 of the anti-overflow UPVC needle valve hot runner structure provided by the utility model:

[0032] like Figures 1 to 3 As shown, the anti-overflow UPVC needle valve hot runner structure includes a hot runner manifold 1, a hot nozzle 4, a valve needle 6 and a high-temperature seal.

[0033] Among them, the hot runner diverter plate 1 is connected to two hot nozzles 4. Two groups of holes corresponding to the two hot nozzles 4 are opened on the hot runner diverter plate 1. Each group of holes includes a valve needle through hole 2 and a flow channel hole 3. The valve needle through hole 2 and the flow channel hole 3 are separately arranged. The bottom of the hot nozzle 4 has a glue outlet 5. The valve needle through hole 2 and the hot runner hole 3 pass through the hot nozzle 4 and intersect at the glue outlet 5.

[0034] Specifically, the valve needle through hole 2 is a vertical hole, which includes a large diameter section and a small diameter section arranged from top to bottom. The large diameter section is installed with a valve sleeve 9 and a high-temperature seal in sequence from top to bottom, and the lower end of the small diameter section is connected to the glue outlet 5.

[0035] Specifically, the valve sleeve 9 is used to be installed at the top end of the hot nozzle 4 to protect the valve needle 6 and improve the sealing performance of the hot runner structure.

[0036] Specifically, the high-temperature seal is a flood seal assembly, comprising a flood seal carrier 7 mounted within the valve needle through-hole 2, and a flood seal 8 mounted on flood seal carrier 7. The flood seal carrier 7 is made of 2316 steel and defines a valve needle passage for the valve needle 6. The flood seal 8 prevents volatile gases from entering the valve needle through-hole 2 and also serves to position the valve needle 6 when it is inserted into the valve needle through-hole 2.

[0037] Specifically, a support column 10 is installed in the valve needle through hole 2. The support column 10 is located between the valve sleeve 9 and the pan-seal carrier 7 to provide support for the valve sleeve 9. The middle part of the support column 10 has a through hole for the valve needle 6 to pass through.

[0038] Specifically, the runner hole 3 is obliquely arranged in the hot runner manifold 1 and the hot nozzle 4 , and includes a large diameter section and a small diameter section arranged from top to bottom, and the lower end of the small diameter section is connected to the glue outlet 5 .

[0039] Specifically, the valve needle 6 is used to be installed in the valve needle through hole 2, and the flow of the plastic melt in the hot runner structure is adjusted by changing the length of the valve needle 6 that is installed downwardly through the glue inlet and outlet 5.

[0040] The working principle of the anti-overflow UPVC needle valve hot runner structure provided by the utility model is: when the valve needle 6 moves downward to completely isolate the flow channel hole 3 and the glue outlet 5, the injection molding stops; when the valve needle 6 rises upward, the plastic melt can enter the glue outlet from the flow channel hole 3, so that the injection molding work can be carried out; during injection molding, the bottom end of the valve needle 6 is located in the flood seal 8, and the flood seal 8 can effectively prevent the volatile gas in the plastic melt from entering the valve needle through hole 2, thereby preventing the surface of the valve needle 6 from becoming black, and the volatile gas from solidifying in the valve needle through hole 2, resulting in the occurrence of blockage of the valve needle through hole 2, black lines at the glue outlet, and valve needle jamming.

[0041] Example 2 of the anti-overflow UPVC needle valve hot runner structure provided by the utility model:

[0042] The main difference between it and Example 1 is:

[0043] In Example 1, the hot runner manifold is connected to two hot nozzles.

[0044] In this embodiment, the hot runner manifold is connected to one or more hot nozzles to meet usage requirements.

[0045] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "top", "bottom", "inner" and other terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0046] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. An anti-overflow UPVC needle valve hot runner structure, characterized in that: include: A hot runner manifold having separate valve needle holes and runner holes; A hot nozzle is connected to the hot runner manifold, and a glue outlet is provided at the bottom of the hot nozzle. The valve needle through hole and the runner hole pass through the hot nozzle and meet at the glue outlet; A valve needle, which is used to be installed in the valve needle through hole to control the flow of plastic melt in the hot runner structure; A high-temperature seal is installed in the valve needle through hole and close to the glue outlet to prevent volatile gas from entering the valve needle through hole, and to hold the valve needle tightly to perform secondary positioning of the valve needle.

2. The anti-overflow UPVC needle valve hot runner structure according to claim 1 is characterized in that: The high temperature seal is a flood seal assembly.

3. The anti-overflow UPVC needle valve hot runner structure according to claim 2 is characterized in that: The pan-seal assembly includes a pan-seal carrier installed in the valve needle through-hole, and a pan-seal installed on the pan-seal carrier.

4. The anti-overflow UPVC needle valve hot runner structure according to claim 3 is characterized in that: The pan-seal carrier is made of 2316 steel and has a valve needle channel for the valve needle to pass through.

5. The anti-overflow UPVC needle valve hot runner structure according to any one of claims 1 to 4, characterized in that: A valve sleeve is also installed in the valve needle through hole to protect the valve needle and improve the sealing performance of the hot runner structure.

6. The anti-overflow UPVC needle valve hot runner structure according to claim 5, characterized in that: The valve needle through hole is a vertical hole, which includes a large diameter section and a small diameter section. The large diameter section is sequentially installed with the valve sleeve and the high-temperature seal from top to bottom, and the end of the small diameter section away from the large diameter section is connected to the glue outlet.

7. The anti-overflow UPVC needle valve hot runner structure according to claim 6, characterized in that: A support column is also installed in the valve needle through hole. The support column is located between the valve sleeve and the high-temperature sealing component to provide support for the valve sleeve. The middle part of the support column has a through hole for the valve needle to pass through.

8. The anti-overflow UPVC needle valve hot runner structure according to any one of claims 1 to 4, characterized in that: The runner hole is obliquely arranged in the hot runner manifold and the hot nozzle, and includes a large diameter section and a small diameter section. One end of the small diameter section away from the large diameter section is connected to the glue outlet.

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