Pipe fitting needle valve side glue inlet hot runner structure

Abstract

The utility model relates to the technical field of hot runner structures, in particular to a pipe fitting needle valve side glue inlet hot runner structure. The structure comprises a splitter plate which is fixedly mounted on a panel and a fixed mold plate; the splitter plate is of a U-shaped structure with an opening facing the cavity and comprises a vertical section, and the upper end and the lower end of the vertical section are connected with a first horizontal section and a second horizontal section respectively. A runner is arranged in the splitter plate and comprises a first sub-runner formed in the first horizontal section, a second sub-runner formed in the vertical section and a third sub-runner formed in the second horizontal section; one end of the hot nozzle is mounted in the second horizontal section, and the other end of the hot nozzle extends to the cavity; and the valve needle is movably mounted in the third sub-runner and extends to the hot nozzle, and the valve needle is used for controlling flowing of the plastic. The utility model effectively solves the technical problem that in the prior art, serpentine patterns are easily formed on the surface of the pipe fitting due to end face glue feeding, so that the appearance quality of the pipe fitting is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runner structures, and in particular to a hot runner structure for side gating of a pipe fitting needle valve. Background Art

[0002] Injection molding technology, also known as injection moulding technology, is a processing method that injects molten plastic into a mold and obtains the required product after cooling and solidification. It has the advantages of high production efficiency, high product precision, and wide application range. However, in the process of injection molding of existing injection molds, there are still some cold runner gating sections in the hot runner system. After the product is injection molded, there is residual sprue material in the cold runner, and the product needs to be demolded by ejection pins. This not only causes waste of injection raw materials but also reduces work efficiency and product appearance quality.

[0003] In view of the above problems, the patent document with the authorization announcement number CN215320325U discloses an injection molding combined mold for hot runner gating at the end face of a pipe fitting. It includes a fixed mold part and a movable mold part. The fixed mold part includes a hot runner system and a fixed mold forming component, and the movable mold part includes a movable mold forming sliding component and a first rear mold core. The fixed mold forming component, the movable mold forming sliding component, and the first rear mold core are combined to form the inner cavity of the wall thickness of a right-angle pipe fitting. The needle valve nozzle is connected to the end face of the inner cavity of the wall thickness of the right-angle pipe fitting. The movable mold part moves away from the fixed mold part, and the slider in the movable mold forming sliding component slides along the inclined guide pillar in the fixed mold forming component, so that the right-angle pipe fitting is demolded in an automatic falling-off manner. This mold connects the hot runner needle valve nozzle to the top surface of the pipe fitting wall, greatly reducing cold glue residue, improving the appearance quality of the product, and eliminating the need for product ejection pins for demolding, thus accelerating work efficiency.

[0004] However, in actual use of the above mold, the gating method of end face gating causes the molten plastic to bend like a snake along the flow direction when it suddenly enters the open and relatively wide cavity after flowing through narrow areas such as the needle valve nozzle, runner, and gate at high speed. After contacting the mold surface, it quickly cools. As the subsequent higher-temperature molten plastic continuously enters the cavity, the cooled material is squeezed to a deeper position in the mold, thus forming snake lines on the surface of the pipe fitting and reducing the appearance quality of the pipe fitting. Summary of the Utility Model

[0005] The utility model provides a hot runner structure for side gating of a pipe fitting needle valve to solve the technical problem that end face gating in the prior art is prone to form snake lines on the surface of the pipe fitting, resulting in reduced appearance quality of the pipe fitting.

[0006] To solve the above problems, the hot runner structure for side gating of a pipe fitting needle valve provided by the utility model adopts the following technical solutions:

[0007] A pipe needle valve side glue hot runner structure, comprising:

[0008] A manifold, which is used to be fixedly mounted on the panel and the fixed plate;

[0009] The diverter plate is a U-shaped structure with its opening facing the cavity, and includes a vertical section, wherein the upper and lower ends of the vertical section are respectively connected to a first horizontal section and a second horizontal section;

[0010] The manifold is provided with flow channels, and the flow channels include a first manifold opened in the first horizontal section, a second manifold opened in the vertical section, and a third manifold opened in the second horizontal section;

[0011] a hot nozzle, one end of which is installed in the second horizontal section and the other end of which extends to the mold cavity;

[0012] A valve needle is movably installed in the third flow branch channel and extends to the hot nozzle, and the valve needle is used to control the flow of plastic.

[0013] The beneficial effect of the pipe needle valve side glue injection hot runner structure provided by the utility model is: by setting the diverter plate as a U-shaped structure with its opening facing the cavity, and installing one end of the hot nozzle in the second horizontal section below, and the other end thereof extending to the cavity, during injection molding, the plastic passes through the first diverter channel, the second diverter channel, the third diverter channel and the hot nozzle in sequence and enters the cavity, and after entering the cavity, it first rushes to the side wall of the cavity and is rebounded by the side wall of the cavity, and then changes the flow direction and gradually fills the cavity to complete the injection molding process. For pipe fittings, since the wall thickness value is much smaller than the length value, the stroke of this side glue injection method is much smaller than the stroke of the end glue injection method, thereby avoiding the situation where the plastic that enters the cavity first is squeezed to a deeper position in the cavity by the plastic that enters the cavity later, thereby avoiding the generation of serpentine on the surface of the pipe fitting and ensuring the appearance quality of the pipe fitting. Through the above arrangement, the utility model adopts the side-feeding glue injection method, shortens the flow distance of the plastic in the cavity, and effectively solves the technical problem in the prior art that end-face glue injection easily forms serpentine patterns on the surface of the pipe, resulting in reduced appearance quality of the pipe.

[0014] Furthermore, a diverter plate baffle is provided on a side of the vertical section away from the cavity, and the diverter plate baffle is fixedly connected to the panel.

[0015] Furthermore, a cylinder is installed on the baffle of the diverter plate, and an output end of the cylinder is connected to the valve needle so that the movement of the valve needle can be controlled by the cylinder.

[0016] Furthermore, a diverter plate insert is provided at the connection between the second diverter channel and the third diverter channel, and the diverter plate insert is provided with a through hole for inserting the valve needle.

[0017] Further, shim blocks are installed on the peripheral side of the flow splitter plate.

[0018] Further, the shim blocks of the flow splitter plate are arranged on the top surface of the first horizontal section, on the side of the vertical section facing the flow splitter baffle, on the side of the vertical section facing the cavity, and on the bottom surface of the second horizontal section.

[0019] Further, a front mold cylindrical insert is fixedly installed on the side of the fixed mold insert facing the hot nozzle, and the front mold cylindrical insert is used to fix the hot nozzle.

[0020] Further, a flange is installed on the top surface of the first horizontal section.

[0021] Further, a quick connector is arranged on the side of the flow splitter baffle away from the vertical section. Description of the Drawings

[0022] By referring to the accompanying drawings and reading the detailed description below, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0023] Figure 1 is a schematic structural diagram of the hot runner structure with needle valve side gating for pipe fittings provided by the present utility model;

[0024] Figure 2 is a cross-sectional view of the hot runner structure with needle valve side gating for pipe fittings provided by the present utility model;

[0025] Figure 3 is a schematic installation position diagram of the hot runner structure with needle valve side gating for pipe fittings provided by the present utility model.

[0026] Description of the Reference Numerals:

[0027] 1. Panel; 2. Fixed mold plate; 3. Vertical section; 4. First horizontal section; 5. Second horizontal section; 6. Cavity; 7. First runner; 8. Second runner; 9. Third runner; 10. Valve pin; 11. Flow splitter baffle; 12. Cylinder; 13. Flow splitter insert; 14. Shim block of flow splitter plate; 15. Fixed mold insert; 16. Front mold cylindrical insert; 17. Flange; 18. Quick connector; 19. Nozzle head; 20. Nozzle core; 21. Cylinder shim block; 22. Screw. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are a part of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0029] It should be noted that the main concept of the hot runner structure with side-gating needle valve for pipe fittings provided by the present utility model is as follows: by providing a U-shaped manifold plate with an opening facing the cavity, which includes a vertical section and two horizontal sections respectively located at the upper and lower ends of the vertical section, one end of the hot nozzle is installed in the lower horizontal section, and the other end extends to the cavity. During injection molding, the plastic sequentially passes through the upper horizontal section, the vertical section, the lower horizontal section, and the hot nozzle and enters the cavity, so that the gating method of the mold is changed from end gating to side gating. After the plastic enters the cavity, it is rebounded by the cavity side wall, then changes the flow direction and gradually fills the cavity, greatly shortening the travel of the plastic in the cavity and avoiding the situation where the plastic that enters the cavity first is squeezed by the plastic that enters the cavity later to a deeper position in the cavity, thereby avoiding the appearance of snake patterns on the surface of the pipe fittings caused thereby.

[0030] After introducing the basic principle of the present utility model, the various non-limiting embodiments of the present utility model will be specifically introduced below. The number of any element in the accompanying drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0031] Next, with reference to several representative embodiments of the present utility model, the principle and spirit of the present utility model will be elaborated in detail.

[0032] Embodiment 1 of the hot runner structure with side-gating needle valve for pipe fittings provided by the present utility model:

[0033] As Figures 1 to 3 shown, the hot runner structure with side-gating needle valve for pipe fittings includes a manifold plate, a hot nozzle, and a valve pin 10. Among them, the manifold plate is fixedly installed on the panel 1 and the fixed mold plate 2 by screws 22, and the hot nozzle is used to connect the manifold plate and the cavity 6.

[0034] Regarding the manifold plate. The manifold plate is of a U-shaped structure, which includes a vertical section 3. The upper and lower ends of the vertical section 3 are respectively connected with a first horizontal section 4 and a second horizontal section 5 extending towards the cavity 6. Among them, the length of the first horizontal section 4 is greater than the length of the second horizontal section 5; a flange 17 is installed on the top surface of the first horizontal section 4; a runner is provided in the manifold plate, and the runner includes a first sub-runner 7 opened in the first horizontal section 4, a second sub-runner 8 opened in the vertical section 3, and a third sub-runner 9 opened in the second horizontal section 5.

[0035] Regarding the hot nozzle. The hot nozzle is installed at one end of the second horizontal section 5 facing the cavity 6, and the other end thereof extends into the cavity 6. The hot nozzle includes a nozzle head 19 and a nozzle core 20; a front mold cylindrical insert 16 is fixedly installed on the side of the fixed mold insert 15 facing the hot nozzle through screws 22, and the front mold cylindrical insert 16 is used to position and fix the hot nozzle.

[0036] Regarding the valve pin 10. The valve pin 10 is movably installed in the third runner 9 and extends into the hot nozzle. The valve pin 10 is used to control the flow of plastic in the runner.

[0037] Specifically, a manifold insert 13 is provided at the connection of the second runner 8 and the third runner 9, and the manifold insert 13 is provided with a mounting hole for passing through the valve pin 10.

[0038] To facilitate the control of the movement of the valve pin 10, a manifold baffle 11 is provided on the side of the vertical section 3 facing away from the cavity 6. The manifold baffle 11 is fixedly connected to the panel 1. A cylinder 12 is installed on the manifold baffle 11, and the output end of the cylinder 12 is connected to the valve pin 10 so as to control the movement of the valve pin 10 through the cylinder 12.

[0039] In addition, a manifold spacer 14 is also installed on the periphery of the manifold; a quick connector 18 is provided on the side of the manifold baffle 11 facing away from the vertical section 3, and the quick connector 18 is used for air inlet and outlet and controlling the reciprocating movement of the cylinder piston; a cylinder spacer 21 is provided between the cylinder 12 and the vertical section 3.

[0040] Specifically, the manifold spacers 14 are arranged on the top surface of the first horizontal section 4, the side of the vertical section 3 facing the manifold baffle 11, the side of the vertical section 3 facing the cavity 6, and the bottom surface of the second horizontal section 5.

[0041] The working principle of the pipe fitting needle valve side-gating hot runner structure provided by the present utility model is as follows: The front mold cylindrical insert 16 is fixed on the fixed mold insert 15 through screws 22, the manifold is fixed on the panel 1 and the fixed mold 2 through screws 22, the hot nozzle is installed on the second horizontal section 5 and the front mold cylindrical insert 16, the manifold spacers 14 are installed on the periphery of the manifold, and a manifold baffle 11 is provided on the side of the vertical section 3 of the manifold facing away from the cavity 6. The manifold baffle 11 is fixedly installed on the panel 1 through screws 22, and the cylinder 12 is installed on the manifold baffle 11. During use, the movement of the valve pin 10 is controlled through the cylinder 11, so that the runner is opened, and the plastic can sequentially pass through the first runner 7, the second runner 8, the third runner 9 and the hot nozzle, and enter the cavity 6 from the side of the cavity 6. After entering the cavity 6, the plastic first hits the side wall of the cavity 6 and is rebounded by the side wall of the cavity 6, and then changes the flow direction and gradually fills the cavity 6, thereby completing the injection molding. After the injection molding is completed, the cylinder 12 controls the movement of the valve pin 10 to close the runner.

[0042] Example 2 of the hot runner structure with side gate injection for pipe fittings provided by the present utility model:

[0043] The main difference between this example and Example 1 lies in that:

[0044] In Example 1, the length of the first horizontal section is greater than the length of the second horizontal section.

[0045] In this example, the length of the first horizontal section is equal to or less than the length of the second horizontal section.

[0046] Based on the above description in this specification, those skilled in the art can also understand the following terms used, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. 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 description of the solution of the present 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 operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present utility model.

[0047] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

Claims

1. A hot runner structure with side gate injection for pipe fittings needle valve, characterized in that, include: A manifold, which is used to be fixedly mounted on the panel and the fixed plate; The diverter plate is a U-shaped structure with its opening facing the cavity, and includes a vertical section, wherein the upper and lower ends of the vertical section are respectively connected to a first horizontal section and a second horizontal section; The manifold is provided with flow channels, and the flow channels include a first manifold opened in the first horizontal section, a second manifold opened in the vertical section, and a third manifold opened in the second horizontal section; a hot nozzle, one end of which is installed in the second horizontal section and the other end of which extends to the mold cavity; A valve needle is movably installed in the third flow branch channel and extends to the hot nozzle, and the valve needle is used to control the flow of plastic.

2. The hot runner structure with side-gating of the pipe fitting needle valve according to claim 1, characterized in that, A diverter plate baffle is arranged on one side of the vertical section away from the cavity, and the diverter plate baffle is fixedly connected to the panel.

3. The hot runner structure with side-gating of the pipe fitting needle valve according to claim 2, characterized in that, A cylinder is installed on the baffle of the diverter plate, and the output end of the cylinder is connected to the valve needle so that the movement of the valve needle can be controlled by the cylinder.

4. The hot runner structure with side-gating of the pipe fitting needle valve according to any one of claims 1 to 3, characterized in that, A splitter plate insert is provided at the connection between the second splitter channel and the third splitter channel, and the splitter plate insert is provided with a mounting hole for mounting the valve needle.

5. The hot runner structure with side-gating of the pipe fitting needle valve according to any one of claims 1 to 3, characterized in that, A diverter plate pad is installed on the peripheral side of the diverter plate.

6. The hot runner structure with side gate injection for pipe fittings needle valve according to claim 5, characterized in that The manifold gasket is arranged on the top surface of the first horizontal section, the side of the vertical section facing the manifold baffle, the side of the vertical section facing the cavity, and the bottom surface of the second horizontal section.

7. The hot runner structure with side-gating of the pipe fitting needle valve according to any one of claims 1 to 3, characterized in that, A front mold column insert is fixedly mounted on one side of the fixed mold plate insert facing the hot nozzle, and the front mold column insert is used to fix the hot nozzle.

8. The hot runner structure with side gate injection for pipe fittings needle valve according to any one of claims 1 to 3, characterized in that, A flange is installed on the top surface of the first horizontal section.

9. The hot runner structure with side gate injection for pipe fittings needle valve according to claim 2 or 3, characterized in that, A quick connector is arranged on one side of the diverter plate baffle away from the vertical section.

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