Needle valve type side glue inlet hot runner structure

Abstract

The utility model provides a needle valve type side glue inlet hot runner structure which comprises an upper template, a groove is formed in the upper template, a limiting plate and a movable plate are sequentially arranged in the groove from bottom to top, a splitter plate and a nozzle core are arranged in the middle of the upper template, the nozzle core is communicated with a runner of the splitter plate, the nozzle core is provided with a sprue located on the side of the splitter plate, and the sprue is communicated with the runner of the splitter plate. The valve needle is fixedly connected with the movable plate, a valve sleeve is fixed to the upper die plate, located over the nozzle core and vertically right opposite to the sprue, and the valve needle is sleeved with the valve sleeve so as to guide the valve needle to vertically move over the sprue. According to the needle valve type side glue inlet hot runner structure, the valve sleeve is positioned on the side of the splitter plate and is positioned right above the nozzle core, so that the influence on the movement precision of the needle valve due to deformation of the valve sleeve caused by over-high temperature can be reduced, the injection molding defects such as flash, short injection and flow marks of a product are avoided, the quality of an injection molding product is improved, and the production efficiency is improved. Meanwhile, the service lives of the valve needle and the valve sleeve are prolonged.

Description

Technical Field

[0001] The utility model relates to the field of hot runner for plastic moulds, in particular to a needle valve type side-gating hot runner structure. Background Art

[0002] A hot runner is a channel used to convey plastic in an injection mould. The hot runner system is divided into an open hot runner system and a needle valve type hot runner system. The valve sleeves in the needle valve type hot runner system are usually installed in two positions. The first is installed on the manifold, and the second is installed above the nozzle.

[0003] However, since the valve sleeves in the above two positions are very close to the plastic in the high-temperature state, the thermal expansion size becomes larger, the position of the valve sleeve shifts, the valve sleeve and the nozzle are not concentric. At the same time, the inner hole of the valve sleeve will become larger or non-circular and deformed at high temperature. The spray fit between the valve pin and the inner hole of the valve sleeve is not good, which will cause the movement direction of the valve pin to shift, resulting in serious wear of the valve pin and the nozzle gate. Content of the Utility Model

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the utility model is to design a needle valve type side-gating hot runner structure, in which the valve sleeve is arranged at a position far from the hot runner to avoid deformation of the valve sleeve and ensure the accuracy of the guiding function of the valve sleeve.

[0005] To achieve the above purpose and reach the above technical effect, a needle valve type side-gating hot runner structure includes an upper template. In the groove of the upper template, a limiting plate and a movable plate are successively arranged from the groove upwards. A manifold and a nozzle core are arranged in the middle of the upper template. The nozzle core is communicated with the flow channel of the manifold. The nozzle core is provided with a gate on the side of the manifold. The valve pin is fixedly connected with the movable plate. The upper template is fixed with a valve sleeve. The valve sleeve is located directly above the nozzle core and is vertically aligned with the gate. The valve sleeve is sleeved on the valve pin to guide the valve pin to move up and down directly above the gate.

[0006] Further, the movable plate includes a push plate and a push plate bottom plate. The push plate is provided with a through hole. A step is arranged in the through hole. The valve pin passes through the through hole and the step supports the needle head of the valve pin. The push plate bottom plate is detachably fixedly connected with the push plate.

[0007] Further, the limiting plate is provided with a limiting hole, and the valve pin passes through the limiting hole.

[0008] Further, the valve sleeve is embedded in the bottom surface of the groove, and the lower surface of the limiting plate is in contact with the upper surface of the valve sleeve.

[0009] Further, the flow channels of the flow splitter plate include a main flow channel and a plurality of sub-flow channels, and the plurality of sub-flow channels are all communicated with the main flow channel; there are a plurality of valve needles, valve sleeves and nozzle cores, each nozzle core is communicated with a sub-flow channel, and each valve sleeve is sleeved on a valve needle.

[0010] Further, a positioning member fixedly connected to the flow splitter plate is provided directly below the flow splitter plate, and the flow splitter plate and the positioning member clamp the nozzle core.

[0011] After adopting the above technical solution, the beneficial effects are as follows: in the present utility model, since the valve sleeve is located on the side of the flow splitter plate and directly above the nozzle core, the possibility of the valve sleeve deforming due to excessive temperature can be reduced, thereby ensuring the fitting accuracy of the valve needle and the valve sleeve, avoiding injection molding defects such as flash, short shot, and flow marks in the product, improving the quality of the injection molded product, and at the same time increasing the service life of the valve needle and the valve sleeve. Description of the Drawings

[0012] Figure 1 It is a cross-sectional view of the present utility model.

[0013] The reference numerals are: 1, upper template; 2, limit plate; 20, limit hole; 3, push plate; 31, through hole; 32, step; 4, push plate bottom plate; 5, valve needle; 6, valve sleeve; 7, flow splitter plate; 8, nozzle core; 81, gate; 9, positioning member. Detailed Embodiment

[0014] The technical solution of the present utility model will be further described below through embodiments:

[0015] Please refer to Figure 1 , a needle valve type side-gating hot runner structure of the present utility model includes an upper template 1, the upper template 1 is provided with a groove, a limit plate 2 and a movable plate, a push plate 3 and a push plate bottom plate 4 are sequentially arranged from bottom to top in the groove, a flow splitter plate 7 and a nozzle core 8 are arranged in the middle of the upper template 1, the nozzle core 8 is communicated with the flow channels of the flow splitter plate 7, the nozzle core 8 is provided with a gate 81 located on the side of the flow splitter plate 7, the valve needle 5 passes through the push plate 3 and is fixedly connected to the push plate bottom plate 4 and the movable plate, the upper template 1 is fixed with a valve sleeve 6, the valve sleeve 6 is located directly above the nozzle core 8 and is vertically aligned with the gate 81, and the valve sleeve 6 is sleeved on the valve needle 5 to guide the valve needle 5 to move up and down directly above the gate 81.

[0016] During operation, the liquid plastic flows into from the flow channels of the flow splitter plate 7 and is output to the cavity of the mold through the gate 81 of the nozzle core 8 to form a plastic product; when injecting the plastic, the push plate 3 and the push plate bottom plate 4 are moved upward to drive the valve needle 5 to move upward, thereby opening the gate 81; the limit plate 2 is used to limit the lowest position of the movable plate, thereby limiting the lowest position of the valve needle 5 to prevent damage to the gate 81.

[0017] In the present utility model, since the valve sleeve 6 is located on the side of the flow dividing plate and directly above the nozzle core 8, the possibility of deformation of the valve sleeve 6 caused by excessive temperature can be reduced, thereby ensuring the fitting accuracy of the valve needle 5 and the valve sleeve 6, avoiding injection molding defects such as flash, short shot, and flow marks in the product, and at the same time increasing the service life of the valve needle 5 and the valve sleeve 6.

[0018] Specifically, the movable plate includes a push plate 3 and a push plate bottom plate 4. The push plate 3 is provided with a through hole 31, and a step 32 is provided in the through hole 31. The valve needle 5 passes through the through hole 31 and the step 32 supports the tip of the valve needle 5. The push plate bottom plate 4 is detachably fixedly connected to the push plate 3. When installing the valve needle, first pass the valve needle 5 through the push plate 3, with the tip of the valve needle 5 located on the step 32, and then install and fix the push plate bottom plate 4 on the push plate 3, so that the movable plate is fixedly connected to the valve needle 5. In one embodiment, the push plate 3 and the push plate bottom plate 4 can be fixedly connected by screwing.

[0019] Specifically, the limiting plate 2 is provided with a limiting hole 20, and the valve needle 5 passes through the limiting hole 20. Among them, when installing the valve needle 5, the limiting hole 20 can play a role in initially positioning the valve needle 5.

[0020] Specifically, the valve sleeve 6 is embedded in the bottom surface of the groove, and the lower surface of the limiting plate 2 contacts the upper surface of the valve sleeve 6. Among them, through the cooperation of the groove and the limiting plate 2, the positioning of the valve sleeve 6 can be realized.

[0021] Specifically, the flow channels of the flow dividing plate 7 include a main flow channel and a plurality of sub-flow channels, and the plurality of sub-flow channels are all communicated with the main flow channel; there are a plurality of valve needles 5, valve sleeves 6, and nozzle cores 8, each nozzle core 8 is communicated with one sub-flow channel, and each valve sleeve 6 is sleeved on one valve needle 5. The needle valve type side-gating hot runner structure of this embodiment can inject mold a plurality of products at the same time. In this embodiment, there are four sub-flow channels, valve needles 5, valve sleeves 6, and nozzle cores 8, while in other embodiments, the above components can also have other quantities.

[0022] Specifically, a positioning member 9 fixedly connected to the flow dividing plate 7 is provided directly below the flow dividing plate 7, and the flow dividing plate 7 and the positioning member 9 clamp the nozzle core 8. In this embodiment, the flow dividing plate 7 and the positioning member 9 are fixedly connected by screwing, while in other embodiments, the flow dividing plate 7 and the positioning member 9 can also be fixedly connected by other means, such as snap connection.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. A needle valve type side-gating hot runner structure, comprising an upper template and a valve pin. Inside the groove of the upper template, a limit plate and a movable plate are sequentially arranged from the groove upwards. In the middle of the upper template, a manifold plate and a nozzle core are provided. The flow channels of the nozzle core and the manifold plate are connected. The nozzle core is provided with a gate located on the side of the manifold plate, and the characteristics are as follows: The valve needle is fixedly connected to the movable plate. The upper template is fixed with a valve sleeve, which is located directly above the nozzle core and is vertically aligned with the gate. The valve sleeve is sleeved on the valve needle to guide the valve needle to move up and down directly above the gate.

2. The needle valve type side-gating hot runner structure according to claim 1, characterized in that, The movable plate includes a push plate and a push plate bottom plate. The push plate is provided with a through hole, and a step is provided in the through hole. The valve needle passes through the through hole and the step supports the needle tip of the valve needle. The push plate bottom plate is detachably fixedly connected to the push plate.

3. The needle valve type side gate hot runner structure according to claim 2, characterized in that The limiting plate is provided with a limiting hole, and the valve needle passes through the limiting hole.

4. The needle valve type side-gating hot runner structure according to claim 1 or 2 or 3, characterized in that, The valve sleeve is embedded in the bottom surface of the groove, and the lower surface of the limiting plate contacts the upper surface of the valve sleeve.

5. The needle valve type side gate hot runner structure according to claim 1, characterized in that, The runner of the manifold plate includes a main runner and a plurality of sub-runners, and the plurality of sub-runners are all communicated with the main runner; there are a plurality of valve needles, valve sleeves and nozzle cores, each nozzle core is communicated with a sub-runner, and each valve sleeve is sleeved on a valve needle.

6. The needle valve type side gating hot runner structure according to claim 1, characterized in that, A positioning member fixedly connected to the manifold plate is provided directly below the manifold plate, and the manifold plate and the positioning member clamp the nozzle core.

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