Needle valve nozzle for precise color mixing injection molding

Abstract

The utility model relates to a needle valve nozzle for precise color mixing injection molding, and belongs to the technical field of injection molding hot runners. Comprising an outer nozzle head and an inner nozzle head, the inner nozzle head is fixedly arranged at the inner center of the outer nozzle head, a glue inlet is formed in the bottom of the outer nozzle head, a vertical first color runner is arranged at a shaft core of the inner nozzle head, the bottom of the first color runner is connected with the glue inlet, a second color runner is arranged in the outer nozzle head, and an annular groove is formed in the outer side wall of the inner nozzle head. The second color runner is connected with the annular groove, the inner nozzle head is provided with a plurality of vertical strip-shaped grooves, the strip-shaped grooves are uniformly distributed on the outer side wall of the inner nozzle head, the top ends of the strip-shaped grooves are connected with the annular groove, and the bottom ends of the strip-shaped grooves are connected with the glue inlet; according to the scheme, the internal structure of the nozzle head is optimized, the second-color melt can pass through the strip-shaped grooves in all directions, the first-color melt is wrapped on the inner side during mixing, and the melts of the two colors are mixed more sufficiently.

Description

TECHNICAL FIELD

[0001] The utility model belongs to injection hot runner technical field relates to a kind of needle valve nozzle head of accurate colour mixing injection molding. BACKGROUND

[0002] With the continuous development of injection mold structure, in order to improve the production efficiency of injection mold, the structure design of hot runner exists in the mold structure of prior art, plastic melt is injected into the forming cavity of mold by the nozzle head connected to the bottom after the shunt effect of shunt plate, hot runner can keep the plastic sent to the sprue by injection machine nozzle always in molten state, without solidification as waste material in each time mold opening, the melt retained in the gating system can be injected into the cavity when injected again.

[0003] In order to make the color of plastic products become numerous, different raw materials need to be mixed in the injection process, and the working process is as follows: melt two different colors of plastics in two pipes in the same barrel, then flow through the same nozzle and inject into a mold, and the product injected out is mixed color. The internal structure of the nozzle in the prior art is usually provided with two separate injection runners, and the two injection runners converge inside the nozzle, and then are sprayed from the end of the nozzle, but the injection nozzle structure in the prior art still has some deficiencies, the flow rate inside the two injection runners is easy to differ, and after the flow of the two colors of plastics is mixed, the two colors of plastics are not mixed sufficiently, which can cause the problem of uneven mixing of plastic parts. SUMMARY

[0004] The utility model discloses a kind of needle valve nozzle head of accurate colour mixing injection molding for the problems existing in prior art, and the technical problems to be solved by the utility model are: how to avoid the insufficient mixing of two color pigments inside nozzle.

[0005] The utility model discloses a kind of needle valve nozzle head of accurate colour mixing injection molding, which can be realized by the following technical solutions: including outer nozzle and inner nozzle, the inner nozzle is fixedly arranged at the inner center of outer nozzle, the bottom of outer nozzle is equipped with glue inlet, the shaft core of inner nozzle is equipped with vertical first color flow channel, the bottom of first color flow channel is connected with glue inlet, the second color flow channel is equipped in outer nozzle, the outer side wall of inner nozzle is equipped with annular groove, the second color flow channel is connected with annular groove, a plurality of vertical strip grooves are equipped on the inner nozzle, the strip grooves are evenly arranged on the outer side wall of inner nozzle, the top end of strip groove is connected with annular groove, and the bottom end of strip groove is connected with glue inlet.

[0006] In the scheme, two colors of plastic raw materials are heated to a molten state respectively, and are injected into the first color flow channel and the second color flow channel respectively. The molten liquid in the first color flow channel can directly flow to the glue inlet at the bottom. The molten liquid in the second color flow channel fills the annular groove first, and then flows vertically into each strip-shaped groove after being divided by the annular groove. The second color molten liquid collects at the bottom of the strip-shaped groove and mixes with the first color molten liquid. The mixed molten liquid is sprayed from the glue inlet and injected into the molding cavity arranged in the mold. After the molding cavity is filled, the mold is rapidly cooled. The molten plastic raw material is cooled and shaped to form the required plastic part. Through the above-mentioned manner, the structure inside the nozzle head is optimized. The second color molten liquid can pass through the strip-shaped grooves in each direction and wrap the first color molten liquid inside during mixing, so that the mixing of the molten liquids of two colors is more sufficient.

[0007] In the above-mentioned precision color mixing injection needle valve nozzle, the inside of the inner nozzle is provided with a reciprocating needle valve. The downward movement of the needle valve can block the glue inlet at the bottom. The needle valve is controlled by a device such as a gas cylinder or a hydraulic cylinder and reciprocates vertically inside the nozzle to control the flow and closing of the molten liquid inside the glue inlet.

[0008] In the above-mentioned precision color mixing injection needle valve nozzle, the top of the outer nozzle is provided with a placement groove with an upward opening, and the top of the inner nozzle is provided with a ring edge. The bottom of the ring edge abuts against the bottom of the placement groove. The placement groove and the ring edge structure are used to fix the position of the inner nozzle in the outer nozzle, so that the structure of the nozzle is more stable.

[0009] In the above-mentioned precision color mixing injection needle valve nozzle, the inner nozzle has a structure of thickening upwards and thinning downwards. A gap is formed between the outer wall of the inner nozzle and the inner wall of the outer nozzle. The gap gradually narrows from top to bottom, and the strip-shaped groove is connected to the gap. When the strip-shaped groove is filled with the second color molten liquid, the second color molten liquid also flows into the gap to increase the flow rate of the second color molten liquid inside the nozzle.

[0010] In the above-mentioned precision color mixing injection needle valve nozzle, a junction is arranged at the connection between the bottom of the inner nozzle and the glue inlet, and the gap is wrapped around the junction. The junction is the mixing position of the first color molten liquid and the second color molten liquid. After the gap is filled, the second color molten liquid can flow into the junction in a ring shape and mix with the first color molten liquid, so that the mixing of the molten liquids of two colors is more sufficient.

[0011] In the above-mentioned precision color mixing injection needle valve nozzle, the top of the second color flow channel is provided with a connected flow regulating hole. An adjusting mechanism is arranged inside the flow regulating hole. The adjusting mechanism can block the second color flow channel. The adjusting mechanism can reciprocate longitudinally in the flow regulating hole to block the second color flow channel, thereby controlling the flow rate of the molten liquid inside the second color flow channel.

[0012] Compared with the prior art, the utility model has the advantages of the following:

[0013] In the scheme, the structure inside the mouth head is optimized, the second color melt can pass through the strip-shaped groove in each direction, and the first color melt is wrapped inside during mixing, so that the two kinds of color melts are mixed more fully. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0015] Fig. 2 It is the front view half cut structure schematic diagram of the utility model;

[0016] Fig. 3 It is the open state structure schematic diagram of the utility model.

[0017] In the drawing, 1, outer mouth head, 1a, glue inlet, 1b, placing groove, 2, inner mouth head, 2a, annular groove, 2b, strip-shaped groove, 2c, ring edge, 3, first color runner, 4, second color runner, 4a, flow regulating hole, 5, needle valve, 6, gap, 7, intersection. DETAILED DESCRIPTION

[0018] The following is the specific embodiment of the utility model and is further described the technical scheme of the utility model in combination with the drawings, but the utility model is not limited to these embodiments. EMBODIMENT

[0019] As Fig. 1 Shown, the needle valve mouth head of precision color mixing injection molding, including outer mouth head 1 and inner mouth head 2, the inner mouth head 2 is located at the inside shaft core of outer mouth head 1, the outer mouth head 1 is "gyroscope" as a whole, the shaft core of inner mouth head 2 is equipped with vertical first color runner 3, the side wall of outer mouth head 1 is equipped with second color runner 4, the top of outer mouth head 1 is equipped with flow regulating hole 4a, the bottom of flow regulating hole 4a is connected with second color runner 4, the inside of flow regulating hole 4a is equipped with adjusting mechanism, the adjusting mechanism adopts needle valve and other structure that can block second color runner 4.

[0020] As Fig. 2 Combined Fig. 3As shown, the inner nozzle head 2 outer side wall is provided with annular groove 2a, the second color flow channel 4 is connected with annular groove 2a, the inner nozzle head 2 outer side wall is provided with several vertical strip groove 2b, the top of strip groove 2b is connected with annular groove 2a, the inner nozzle head 2 is thick in the upper and thin in the lower structure, the outer wall of the inner nozzle head 2 and the inner wall of the outer nozzle head 1 are provided with gap 6, the gap 6 is gradually narrowed from top to bottom, the strip groove 2b is connected with the gap 6, the bottom of the outer nozzle head 1 is provided with glue inlet 1a, the bottom of the inner nozzle head 2 and the connecting part of glue inlet 1a are provided with intersection 7, the gap 6 is wrapped in the circumferential side of intersection 7 and connected with intersection 7, the bottom of the first color flow channel 3 is connected with intersection 7, the inside of the inner nozzle head 2 is provided with reciprocating needle valve 5, the needle valve 5 can block the bottom glue inlet 1a, the top of the outer nozzle head 1 is provided with placing groove 1b with opening upward, the top of the inner nozzle head 2 is provided with ring edge 2c, the bottom of the ring edge 2c abuts against the bottom of the placing groove 1b.

[0021] The working principle of the scheme is as follows, as shown in the figure, Figs. 1-3 The two colors of plastic raw materials are heated to a molten state respectively, and are injected into the first color flow channel 3 and the second color flow channel 4 respectively. The first color melt flows vertically downward in the first color flow channel 3 to the intersection 7. The melt in the second color flow channel 4 fills the annular groove 2a first, and then flows vertically downward into each strip groove 2b after being divided by the annular groove 2a. The gap 6 between the inner nozzle head 2 and the outer nozzle head 1 is then filled. The second color melt wraps the first color melt on the inside at the intersection 7, mixes with the first color melt, and makes the two colors of melt mix more fully, and finally is sprayed out from the glue inlet 1a.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0023] Although the terms 1, outer nozzle head; 1a, glue inlet; 1b, placing groove; 2, inner nozzle head; 2a, annular groove; 2b, strip groove; 2c, ring edge; 3, first color flow channel; 4, second color flow channel; 4a, flow regulating hole; 5, needle valve; 6, gap; 7, intersection are used more frequently in this paper, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the present application; any interpretation of them as additional limitations is contrary to the spirit of the present application.

Claims

1. A precision color mixing injection needle valve nozzle head, comprising an outer nozzle head (1) and an inner nozzle head (2), the inner nozzle head (2) is fixedly arranged at the inner center of the outer nozzle head (1), the bottom of the outer nozzle head (1) is provided with a glue inlet (1a), characterized in that, The shaft core of the inner nozzle head (2) is provided with a vertical first color flow channel (3), the bottom of the first color flow channel (3) is connected with the glue inlet (1a), the inner nozzle head (2) is internally provided with a second color flow channel (4), the outer side wall of the inner nozzle head (2) is provided with an annular groove (2a), the second color flow channel (4) is connected with the annular groove (2a), the inner nozzle head (2) is provided with a plurality of vertical strip grooves (2b), the strip grooves (2b) are uniformly arranged on the outer side wall of the inner nozzle head (2), the top end of the strip groove (2b) is connected with the annular groove (2a), and the bottom end of the strip groove (2b) is connected with the glue inlet (1a).

2. A precision color-mixing injection molded needle valve tip according to claim 1, wherein, The inner nozzle head (2) is internally provided with a reciprocating needle valve (5), and the needle valve (5) can block the glue inlet (1a) at the bottom when moving downward.

3. A precision color-mixing injection molded needle valve tip according to claim 1, wherein, The top of the outer nozzle head (1) is provided with a placing groove (1b) with an upward opening, the top of the inner nozzle head (2) is provided with a ring edge (2c), and the bottom of the ring edge (2c) abuts against the bottom of the placing groove (1b).

4. A precision color-mixing injection molded needle valve tip according to claim 3, wherein, The inner nozzle head (2) has a structure of thickening upwards and thinning downwards, a gap (6) is formed between the outer wall of the inner nozzle head (2) and the inner wall of the outer nozzle head (1), the gap (6) gradually narrows from top to bottom, and the strip groove (2b) is connected with the gap (6).

5. A precision color-mixing injection molded needle valve tip according to claim 4, wherein, The bottom of the inner nozzle head (2) is provided with a junction (7) at the connection with the glue inlet (1a), and the gap (6) is wrapped around the side of the junction (7).

6. A precision color-mixing injection molded needle valve tip according to claim 1, wherein, The top of the second color flow channel (4) is provided with a connected flow adjusting hole (4a), the inside of the flow adjusting hole (4a) is provided with an adjusting mechanism, and the adjusting mechanism can block the second color flow channel (4).

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