Double-color mold co-injection hot nozzle valve needle structure

Abstract

The utility model relates to the technical field of injection molding equipment, and discloses a double-color mold co-injection hot nozzle valve needle structure which comprises a hot runner plate, the upper surface of the hot runner plate is fixedly connected with a splitter plate, the upper surface of the splitter plate is fixedly connected with a panel, the upper surface of the panel is fixedly connected with a main nozzle, and the upper surface of the main nozzle is fixedly connected with a hot runner. A hot nozzle piece is arranged at the bottom of the hot runner plate, a threaded cylinder is in threaded connection with the bottom of the hot nozzle piece, a discharging nozzle is fixedly connected with the bottom of the threaded cylinder, an electric heating wire is fixedly connected into the inner wall of the discharging nozzle, a front filter disc is fixedly connected into the discharging nozzle, and a rear filter disc is arranged below the front filter disc. According to the hot nozzle piece, the threaded cylinder, the discharging nozzle, the electric heating wire, the front filter disc, the rear filter disc and the flow guide unit are matched, so that materials passing through the hot nozzle piece can be subjected to flow guide extrusion, the mixing uniformity of the materials is further improved, and the problem that the production quality of products is affected due to the fact that the plastic materials are mixed uniformly is solved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a dual-color mold co-injection hot nozzle valve needle structure. Background Technology

[0002] Hot runner injection molding is a material molding process that uses hot runner molds for injection molding. Hot runner injection molding can avoid excess material on the surface of the finished product and improve the efficiency of injection molding. When performing hot runner injection molding, it may be necessary to mix and blend two or more different colored plastics to produce products with composite colors.

[0003] A search revealed that Chinese Patent Publication No. CN211492588U discloses a hot runner injection nozzle that facilitates color mixing. The nozzle includes a flow divider inside the mixing cylinder. By setting the flow divider, the mixed material can be evenly dispersed into the discharge cylinder. The discharge cylinder then gathers the dispersed material and guides it into the injection mold. Through the above process, the material can be mixed a second time before entering the mold, thereby further improving the mixing effect of the material.

[0004] In practical use, the existing hot nozzle valve needle structure results in a small mixing amplitude for materials passing through it when mixing them with the flow divider core. The materials only flow outward along the upper surface of the flow divider core and then merge again after passing through it. This leads to low secondary mixing efficiency for the materials on the periphery that are not in direct contact with the flow divider core. To address this issue, a dual-color mold co-injection hot nozzle valve needle structure is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a dual-color mold co-injection hot nozzle valve needle structure, which aims to improve the problem that the mixing effect is poor when the material is mixed for the second time by setting a flow divider core.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a dual-color mold co-injection hot nozzle valve needle structure, including a hot runner plate, a flow divider plate fixedly connected to the upper surface of the hot runner plate, a panel fixedly connected to the upper surface of the flow divider plate, a main nozzle fixedly connected to the upper surface of the panel, a cylinder fixedly connected inside the panel, a hot nozzle component provided at the bottom of the hot runner plate, a threaded cylinder threadedly connected to the bottom of the hot nozzle component, a discharge nozzle fixedly connected to the bottom of the threaded cylinder, an electric heating wire fixedly connected to the inner wall of the discharge nozzle, a front filter plate fixedly connected inside the discharge nozzle, a rear filter plate provided below the front filter plate, and a flow guiding unit provided above the rear filter plate. The flow guiding unit is used to guide the material passing through the front filter plate.

[0007] As a further description of the above technical solution:

[0008] The hot nozzle component includes a hot nozzle body, which is fixedly connected to the bottom of the hot runner plate. A hot nozzle heating coil is fixedly connected to the inner wall of the hot nozzle body. A hot nozzle tip is fixedly connected inside the hot nozzle body. A hot nozzle core is fixedly connected inside the hot nozzle tip. A valve needle body is provided inside the hot nozzle body.

[0009] As a further description of the above technical solution:

[0010] The upper end of the valve needle body is fixedly connected to the bottom output end of the cylinder, and the valve needle body is sleeved inside the hot nozzle core.

[0011] As a further description of the above technical solution:

[0012] The rear filter disc is fixedly connected to the inside of the discharge nozzle, and shearing holes are provided on the upper surfaces of both the front and rear filter discs.

[0013] As a further description of the above technical solution:

[0014] The flow guiding unit includes a double-cone flow guide, which is disposed in the gap between the front filter plate and the rear filter plate. A fixing rod is fixedly connected to the outer side of the double-cone flow guide, and the end of the fixing rod away from the double-cone flow guide is fixedly connected to the inner wall of the discharge nozzle.

[0015] As a further description of the above technical solution:

[0016] An upper guide ring is fixedly connected to the upper side of the inside of the discharge nozzle, and a lower guide ring is provided below the front filter plate. The lower guide ring is fixedly connected to the inside of the discharge nozzle.

[0017] As a further description of the above technical solution:

[0018] The inner rings of the upper and lower guide rings, which are close to each other, are both chamfered.

[0019] As a further description of the above technical solution:

[0020] The lower guide ring is located directly above the double-cone guide.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the material after passing through the hot nozzle can be guided and squeezed by the combination of the threaded cylinder, the discharge nozzle, the electric heating wire, the front filter plate, the rear filter plate and the flow guiding unit, so that the material can be mixed with each other, thereby improving the mixing uniformity of the material and reducing the problem of uneven mixing of plastic materials affecting the production quality of the product. At the same time, the discharge nozzle can be quickly disassembled and installed, which is convenient for replacement and maintenance.

[0023] 2. In this utility model, the upper and lower guide rings work together to guide the flow of material entering the discharge nozzle, allowing the material to flow better to the front filter plate and the double cone guide, thereby further improving the uniformity of mixing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a dual-color mold co-injection hot nozzle valve needle proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of a partial planar cross-section of a dual-color mold co-injection hot nozzle valve needle structure proposed in this utility model;

[0026] Figure 3 This utility model proposes a dual-color mold co-injection hot nozzle valve needle structure. Figure 2 Partial diagram of the driving force at point A;

[0027] Figure 4 This is a schematic diagram of a hot nozzle and a discharge nozzle with a dual-color mold co-injection hot nozzle valve needle structure proposed in this utility model;

[0028] Figure 5 This is a schematic diagram showing a cross-sectional view of the front part of the hot nozzle and the discharge nozzle of a dual-color mold co-injection hot nozzle valve needle structure proposed in this utility model;

[0029] Figure 6 This utility model proposes a dual-color mold co-injection hot nozzle valve needle structure. Figure 5 A schematic diagram of part B;

[0030] Figure 7 This is a schematic cross-sectional view of the front filter disc, rear filter disc, flow guiding unit, upper flow guiding ring, and lower flow guiding ring of a dual-color mold co-injection hot nozzle valve needle structure proposed in this utility model.

[0031] Legend:

[0032] 1. Hot runner plate; 2. Diverter plate; 3. Panel; 4. Main nozzle; 5. Cylinder; 6. Hot nozzle component; 61. Hot nozzle body; 62. Hot nozzle heating coil; 63. Hot nozzle tip; 64. Hot nozzle core; 65. Valve needle body; 7. Threaded cylinder; 8. Discharge nozzle; 9. Electric heating wire; 10. Front filter plate; 11. Rear filter plate; 111. Double cone guide; 112. Fixing rod; 12. Upper guide ring; 13. Lower guide ring. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figures 1-2 This utility model provides an embodiment of a dual-color mold co-injection hot nozzle valve needle structure, including a hot runner plate 1, a manifold plate 2 fixedly connected to the upper surface of the hot runner plate 1, the diameter of the hot nozzle channel of the hot runner plate 1 being in the range of φ8-16, the diameter of the manifold plate 2 being in the range of φ8-22, a panel 3 fixedly connected to the upper surface of the manifold plate 2, a main nozzle 4 fixedly connected to the upper surface of the panel 3, the main nozzle 4 being actively heated, the inlet gate being 3-5MM, the bottom end of the main nozzle 4 being interconnected with the interior of the manifold plate 2, the material being able to enter the interior of the manifold plate 2 through the main nozzle 4, a cylinder 5 fixedly connected to the interior of the panel 3, the number of cavities of the product being 1-128, etc.

[0035] A hot runner plate 1 has a hot nozzle 6 at its bottom. The hot nozzle 6 and the manifold 2 are made of steel with a Cr content in the 3Cr-6Cr range. The hot nozzle 6 and manifold 2 are separate designs to reduce the probability of carbonization and facilitate maintenance. The manifold 2 and the hot nozzle 6 are internally interconnected. The material will ultimately be injected into the mold through the hot nozzle 6. The hot nozzle 6 includes a hot nozzle body 61, which is fixedly connected to the bottom of the hot runner plate 1. A hot nozzle holder is fitted to the outside of the hot nozzle body 61 to guide and limit its installation. A hot nozzle heating coil 62 is fixedly connected to the inner wall of the hot nozzle body 61. The heating coil 62 has denser coils at both ends and sparser coils in the middle (2-5 coils at the head, 2-6 coils at the tail) to reduce the probability of carbonization. The hot nozzle heating coil 62 heats the inside of the hot nozzle 6, preventing the material from cooling down when entering the hot nozzle 6, which could affect injection molding. A hot nozzle is fixedly connected inside the hot nozzle body 61. The nozzle 63 has a sealing diameter of φ12-φ30 and a gate diameter of φ15-φ35. A nozzle core 64 is fixedly connected inside the nozzle 63. The gate diameter of the nozzle core 64 is 1mm-5mm, and it is made of beryllium copper. A flow channel exists between the nozzle core 64 and the nozzle 63, allowing material to flow downwards through the flow channel out of the nozzle body 61 and into the mold. A valve needle body 65 is located inside the nozzle body 61. The upper end of the valve needle body 65 is fixedly connected to the bottom output end of the cylinder 5. The valve needle body 65 is sleeved inside the hot nozzle core 64. The valve needle body 65 has a sealing diameter of 1-5mm and is made of beryllium copper. When the cylinder 5 is started, it can drive the valve needle body 65 to move linearly up and down. When the valve needle body 65 moves down, it will seal the bottom of the hot nozzle 6, thereby achieving precise control of the molten plastic. The above structures are all existing technologies in this field and will not be described in detail here.

[0036] Reference Figures 4-6The bottom of the heating nozzle 6 is threadedly connected to a threaded cylinder 7, which is detachably connected to the bottom of the heating nozzle 6. A discharge nozzle 8 is fixedly connected to the bottom of the threaded cylinder 7. After passing through the heating nozzle 6, the material enters the discharge nozzle 8. The discharge nozzle 8 can be quickly installed and removed by simply turning the threaded cylinder 7, facilitating replacement. An electric heating wire 9 is fixedly connected to the inner wall of the discharge nozzle 8. When energized, the electric heating wire 9 generates heat to heat the inside of the discharge nozzle 8, preventing the material from solidifying at low temperatures when passing through it. A pre-filter disc is fixedly connected inside the discharge nozzle 8. 10. A rear filter plate 11 is provided below the front filter plate 10. The rear filter plate 11 is fixedly connected to the inside of the discharge nozzle 8. Shearing holes are opened on the upper surface of both the front filter plate 10 and the rear filter plate 11. When the material enters the discharge nozzle 8, it will pass through the front filter plate 10 and the rear filter plate 11 in sequence. When the material passes through the front filter plate 10 and the rear filter plate 11, it cannot pass through completely directly. It will be squeezed through the shearing holes to achieve diversion and shearing, so that the materials can be further mixed with each other, improving the mixing effect of the materials and reducing the situation where uneven material mixing causes product color problems.

[0037] A flow guiding unit is provided above the rear filter disc 11. The flow guiding unit is used to guide the material passing through the front filter disc 10. The flow guiding unit includes a double cone guide fluid 111. The double cone guide fluid 111 is set in the gap between the front filter disc 10 and the rear filter disc 11. A fixing rod 112 is fixedly connected to the outside of the double cone guide fluid 111. The end of the fixing rod 112 away from the double cone guide fluid 111 is fixedly connected to the inner wall of the discharge nozzle 8. The double cone guide fluid 111 is fixedly installed inside the discharge nozzle 8 by the fixing rod 112. When the material passes through the front filter disc 10 and reaches the double cone guide fluid 111, it will move along the inclined surface of the double cone guide fluid 111 to the inner wall of the discharge nozzle 8. During this process, the material will be turbulently mixed again.

[0038] Reference Figures 6-7 An upper guide ring 12 is fixedly connected to the upper side of the inside of the discharge nozzle 8, and a lower guide ring 13 is provided below the front filter plate 10. The lower guide ring 13 is fixedly connected to the inside of the discharge nozzle 8. The inner rings of the upper guide ring 12 and the lower guide ring 13 are both chamfered on the side closest to each other. The lower guide ring 13 is located directly above the double cone guide fluid 111. When the material enters the discharge nozzle 8 through the hot nozzle 6, it will flow evenly onto the front filter plate 10 along the inclined surface of the upper guide ring 12. This can reduce the material residue at the connection between the discharge nozzle 8 and the hot nozzle 6. At the same time, after the material passes through the front filter plate 10, it can flow completely onto the double cone guide fluid 111 along the inclined surface of the lower guide ring 13 for complete re-turbulence and improve the uniform mixing effect of the material.

[0039] Working principle: After the material enters the manifold 2 through the main nozzle 4, it enters the hot nozzle 6 and is then injected into the mold through the discharge nozzle 8. When the material enters the discharge nozzle 8, it passes through the front filter plate 10 and the rear filter plate 11 in sequence. At this time, the material is squeezed against each other and passes through the shear holes on the front filter plate 10 and the rear filter plate 11, which further turbulently mixes the material. At the same time, when the material passes through the front filter plate 10, it flows completely along the inclined surface of the lower guide ring 13 onto the double cone guide 111, and then is squeezed and moved along the inclined surface of the double cone guide 111 to the inner wall of the discharge nozzle 8, which further mixes the material, improves the mixing uniformity of the material, and reduces the situation where uneven mixing of the material affects the product quality. After the injection is completed, the cylinder 5 drives the valve needle body 65 to move down, which can close the hot nozzle 6 and achieve precise control of the molten plastic.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A two-color mold co-injection hot nozzle valve needle structure comprising a hot runner plate (1), characterized in that: The upper surface of the hot runner plate (1) is fixedly connected with a flow distribution plate (2), the upper surface of the flow distribution plate (2) is fixedly connected with a face plate (3), the upper surface of the face plate (3) is fixedly connected with a main nozzle (4), the inside of the face plate (3) is fixedly connected with a cylinder (5), the bottom of the hot runner plate (1) is provided with a hot nozzle piece (6), the bottom of the hot nozzle piece (6) is threadedly connected with a threaded cylinder (7), the bottom of the threaded cylinder (7) is fixedly connected with a discharge nozzle (8), the inner wall of the discharge nozzle (8) is fixedly connected with an electric heating wire (9), the inside of the discharge nozzle (8) is fixedly connected with a front filter disc (10), the lower portion of the front filter disc (10) is provided with a rear filter disc (11), the upper portion of the rear filter disc (11) is provided with a flow guiding unit, and the flow guiding unit is used for guiding the material passing through the front filter disc (10).

2. A dual color mold co-injection nozzle valve needle structure according to claim 1, characterized in that: The hot nozzle piece (6) comprises a hot nozzle body (61), the hot nozzle body (61) is fixedly connected to the bottom of the hot runner plate (1), the inner wall of the hot nozzle body (61) is fixedly connected with a hot nozzle heating ring (62), the inside of the hot nozzle body (61) is fixedly connected with a hot nozzle nozzle head (63), the inside of the hot nozzle nozzle head (63) is fixedly connected with a hot nozzle nozzle core (64), and the inside of the hot nozzle body (61) is provided with a valve needle body (65).

3. A dual color mold co-injection nozzle valve needle structure according to claim 2, characterized in that: The upper end of the valve needle body (65) is fixedly connected with the bottom output end of the cylinder (5), and the valve needle body (65) is sleeved in the inside of the hot nozzle nozzle core (64).

4. The dual color co-injection hot nozzle valve pin structure of claim 1, wherein: The rear filter disc (11) is fixedly connected with the inside of the discharge nozzle (8), and the upper surfaces of the front filter disc (10) and the rear filter disc (11) are both provided with shear holes.

5. The dual color mold co-injection nozzle valve needle structure of claim 1, wherein: The flow guiding unit comprises a double-cone flow guiding body (111), the double-cone flow guiding body (111) is arranged in the gap between the front filter disc (10) and the rear filter disc (11), the outer side of the double-cone flow guiding body (111) is fixedly connected with a fixing rod (112), and the end, away from the double-cone flow guiding body (111), of the fixing rod (112) is fixedly connected with the inner wall of the discharge nozzle (8).

6. A dual color mold co-injection nozzle valve needle structure according to claim 1, characterized in that: The inside of the discharge nozzle (8) is fixedly connected with an upper flow guiding ring (12), the lower portion of the front filter disc (10) is provided with a lower flow guiding ring (13), and the inside of the discharge nozzle (8) is fixedly connected with the lower flow guiding ring (13).

7. A dual color mold co-injection nozzle valve needle structure according to claim 6, characterized in that: The inner circles of the sides, close to each other, of the upper flow guiding ring (12) and the lower flow guiding ring (13) are both provided in an inverted angle structure.

8. A dual color mold co-injection nozzle valve needle structure according to claim 6, characterized in that: The lower flow guiding ring (13) is located directly above the double-cone flow guiding body (111).

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