Hot runner injection mold

Abstract

The utility model relates to a hot runner injection mold. The hot runner injection mold comprises an upper mold base, a lower mold base, an upper mold core assembly, a lower mold core, a hot nozzle pipe, a runner plate and a runner plate joint, the utility model aims at that an injection molding machine injects materials melted at high temperature from an injection molding hole, the materials are differentiated to each hot nozzle pipe through a runner plate, the materials are injected into each mold cavity through the hot nozzle pipes, the positioning seat forms the outer contour of an injection molding piece through the combination of the inner mold core piece and the outer mold core piece, and the lower mold core forms the inner contour of the injection molding piece. A closed mold cavity is formed, so that a one-to-many production mode is met; after an injection molded part is cooled and demolded, the runner plate is externally connected with a control box through the runner plate connector, precise temperature control is achieved, materials in the hot nozzle pipe are reheated to be in a liquefied state, then injection molding is conducted, waste-free production is achieved, the material cost is reduced, and the hot nozzle is suitable for producing medical devices with extremely high material requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of mold design, and particularly relates to a hot runner injection mold. Background Art

[0002] In the field of medical device manufacturing, injection molds are usually used to produce disposable medical consumables. Due to the special requirements of medical products such as biocompatibility and sterility, medical-grade plastics with high costs are usually used. However, in the production process of traditional cold runner injection molds, runner condensates will be generated. These wastes may be contaminated due to contact with the external environment and cannot be directly recycled for medical-grade products, resulting in waste of raw materials and increased production costs. Content of the Utility Model

[0003] In order to overcome the deficiencies of the background art, the technical solution adopted by the utility model is: a hot runner injection mold, which includes an upper mold base, a lower mold base, an upper mold core assembly, a lower mold core, a hot nozzle tube, a runner plate and a runner plate joint. The upper mold base and the lower mold base are respectively clamped with the upper mold core assembly and the lower mold core distributed in a rectangular array. The upper mold core assembly includes a positioning seat, and an inner core part and an outer core part installed on the inner and outer sides of the positioning seat. The lower mold core is arranged between the inner core part and the outer core part and combines to form a mold cavity for injection molding. The upper mold base is provided with an injection hole, and the injection hole is communicated with the hot nozzle tube through the runner plate. The output end of the hot nozzle tube passes through the positioning seat and extends to the mold cavity. The outer side of the upper mold base is connected with a runner plate joint for electrically connecting the runner plate.

[0004] By adopting the above technical solution, the injection molding machine injects the high-temperature molten material from the injection hole, divides the material into each hot nozzle tube through the runner plate, and injects the material into each mold cavity by the hot nozzle tube. Among them, the positioning seat forms the outer contour of the injection molded part through the combination of the inner core part and the outer core part, and the lower mold core forms the inner contour of the injection molded part and forms a closed mold cavity, meeting the production mode of one mold with multiple cavities; when the injection molded part is cooled and demolded, the runner plate is externally connected to a control box through the runner plate joint and realizes precise temperature control, reheats the material in the hot nozzle tube to the liquefied state and then injects it, realizing waste-free production, reducing material costs, and being suitable for producing medical devices with extremely high material requirements.

[0005] The utility model is further set as follows: the upper mold base includes a cover plate, a mounting plate, an upper fixed template and a lower fixed template connected in sequence from top to bottom. The injection hole is arranged at the center of the cover plate. The mounting plate is provided with mounting grooves for mounting the hot nozzle tube and the runner plate. The upper fixed template and the lower fixed template combine to form a first countersunk head groove for mounting the upper mold core assembly. The positioning seat is provided with a first step corresponding to the first countersunk head groove.

[0006] With the above technical solution, the upper die base adopts a layered assembly structure, and the cover plate, mounting plate, upper fixed template and lower fixed template are sequentially connected by pin shaft positioning and screw connection, which is convenient for replacing core components such as damaged upper die core components, hot nozzle pipes and runner plates, and reduces the maintenance cost.

[0007] The present utility model is further configured such that the first counterbore is provided with a first positioning surface for restricting the rotation direction of the positioning seat.

[0008] With the above technical solution, the rotation direction of the positioning seat is restricted through the first positioning surface, the assembly accuracy of the positioning seat is improved, and the upper die core assembly is effectively prevented from rotating and shifting due to vibration during mold closing or injection molding, ensuring the precise alignment of the mold cavity profile.

[0009] The present utility model is further configured such that wiring grooves are provided on both sides of the mounting groove of the mounting plate, and a wire pressing plate is provided at the connection between the wiring groove and the mounting groove.

[0010] With the above technical solution, the mounting plate separates the runner plate and the connecting wire, preventing the protective layer of the connecting wire from being damaged due to high temperature. The connecting wire is fixed by the wire pressing plate, preventing the connecting wire from getting stuck between the mounting plate and the cover plate, facilitating the assembly of the mold, and avoiding the phenomenon of exposed copper wire and short circuit.

[0011] The present utility model is further configured such that the positioning seat is provided with a protruding portion, a first threaded hole provided in the protruding portion, second threaded holes circumferentially distributed outside the protruding portion, and a shaping groove provided on one side of the protruding portion. The inner core member is snap-fitted to the positioning seat through the protruding portion and connected to the positioning seat through the first threaded hole. The outer core member is connected to the positioning seat through the second threaded hole. The shaping groove is provided with a feed hole. The output end of the hot nozzle pipe extends to the shaping groove, and the material is injected into the mold cavity through the feed hole.

[0012] Further, the upper fixed template is provided with an air inlet channel and an air outlet channel. The positioning seat is provided with a first cooling groove and a second cooling groove respectively communicating with the air inlet channel and the air outlet channel. The outer core member is provided with a transfer groove communicating the first cooling groove and the second cooling groove.

[0013] Further, the outer core member is provided with two groups of symmetrically distributed transfer grooves.

[0014] With the above technical solution, when rapid cooling is required after injection molding, the gas is passed through the air inlet channel, through the first cooling groove, the transfer groove and the second cooling groove in sequence and flows out from the air outlet channel, thereby realizing heat exchange. And the air flow surrounds between the positioning seat and the outer core member, ensuring uniform cooling of the mold cavity wall temperature, enabling the injection molded part to be quickly cooled and formed, and improving the production efficiency.

[0015] The utility model is further configured such that the lower die base includes an upper movable template, a lower movable template, and a bottom plate that are sequentially connected from top to bottom. The upper movable template is provided with a positioning plate for positioning the lower die core. The lower movable template and the bottom plate are combined to form a second counterbore for installing the lower die core, and the lower die core is provided with a second stepped portion corresponding to the second counterbore.

[0016] Furthermore, the bottom plate is provided with a cooling channel corresponding to the lower die core, and the lower die core is provided with a sealing groove for installing a sealing ring at the second stepped portion.

[0017] Furthermore, the second counterbore is provided with a second positioning surface for restricting the rotation direction of the lower die core.

[0018] Adopting the above technical solution, the lower die core is a rotary pipe fitting structure. Through the double positioning of the positioning groove and the positioning plate, the lower die core is prevented from shifting relative to the upper die core assembly during mold closing, which is suitable for the molding structure for producing thin-walled injection molded parts. The cooling efficiency of the lower die core is improved through the cooling channel, enabling the injection molded part to be quickly cooled and formed, thereby improving production efficiency.

[0019] The following further describes the embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0020] Figure 1 is a perspective view of the present utility model;

[0021] Figure 2 is a cross-sectional view of the present utility model;

[0022] Figure 3 is of the present utility model Figure 2 partial enlarged view at A in;

[0023] Figure 4 is a top view of the present utility model after removing the cover plate;

[0024] Figure 5 is a cross-sectional view of the upper fixed template of the present utility model;

[0025] Figure 6 is a bottom view of the positioning seat of the present utility model;

[0026] Figure 7 is a top view of the positioning seat of the present utility model;

[0027] Figure 8 is a perspective view of the inner core part of the present utility model;

[0028] Figure 9 is of the present utility model Figure 2 partial enlarged view at B in;

[0029] Wherein: 1 - upper die holder, 2 - lower die holder, 3 - upper die core assembly, 4 - lower die core, 5 - hot nozzle tube, 6

[0030] - runner plate, 7 - runner plate joint, 8 - mold cavity, 11 - injection hole, 12 - cover plate, 13 - mounting plate, 14

[0031] - upper fixed template, 15 - lower fixed template, 16 - wire pressing plate, 21 - upper movable template, 22 - lower movable template, 23 - bottom plate, 24 - positioning plate, 31 - positioning seat, 32 - inner core part, 33 - outer core part, 41 - second step part, 42 - sealing groove, 131 - mounting groove, 132 - wiring groove, 141 - air inlet channel, 142 - air outlet channel, 151 - first countersunk head groove, 152 - first positioning surface, 221 - second countersunk head groove, 222 - second positioning surface, 231 - cooling channel, 311 - first step part, 312 - convex part, 313 - first threaded hole, 314 - second threaded hole, 315 - shaping groove, 316 - feeding hole, 317 - first cooling groove, 318 - second cooling groove, 321 - transfer groove; Specific embodiments

[0032] As Figures 1-3 shown, the present utility model provides a hot runner injection mold, including an upper die holder 1, a lower die holder 2, an upper die core assembly 3, a lower die core 4, a hot nozzle tube 5, a runner plate 6 and a runner plate joint 7. The upper die holder 1 and the lower die holder 2 are respectively clamped with sixteen groups of upper die core assemblies 3 and lower die cores 4 distributed in a rectangular array. The upper die core assembly 3 includes a positioning seat 31, and an inner core part 32 and an outer core part 33 installed on the inner and outer sides of the positioning seat 31. The lower die core 4 is arranged between the inner core part 32 and the outer core part 33 and combines to form a mold cavity 8 for injection molding. The upper die holder 1 is provided with an injection hole 11, and the injection hole 11 is communicated with the hot nozzle tube 5 through the runner plate 6, and the output end of the hot nozzle tube 5 passes through the positioning seat 31 and extends to the mold cavity 8. The outer side of the upper die holder 1 is connected with a runner plate joint 7 for electrically connecting the runner plate 6.

[0033] Combined with Figure 4 、 6As shown, in this embodiment, the upper mold base 1 includes a cover plate 12, a mounting plate 13, an upper fixed template 14, and a lower fixed template 15 that are connected in sequence from top to bottom. The injection hole 11 is provided at the center of the cover plate 12. The mounting plate 13 is provided with a mounting groove 131 for mounting the hot nozzle tube 5 and the runner plate 6. The upper fixed template 14 and the lower fixed template 15 are combined to form a first countersunk head groove 151 for mounting the upper mold core assembly 3. The positioning seat 31 is provided with a first stepped portion 311 corresponding to the first countersunk head groove 151. The upper mold base 1 adopts a layered assembly structure, and the cover plate 12, the mounting plate 13, the upper fixed template 14, and the lower fixed template 15 are sequentially connected by pin shaft positioning and screw connection, which is convenient for replacing core components such as the damaged upper mold core assembly 3, the hot nozzle tube 5, and the runner plate 6. The first countersunk head groove 151 is provided with a first positioning surface 152 for restricting the rotation direction of the positioning seat 31. The rotation direction of the positioning seat 31 is restricted through the first positioning surface 152, improving the assembly accuracy of the positioning seat 31, effectively preventing the upper mold core assembly 3 from rotating and shifting due to vibration during mold closing or injection molding, and ensuring the precise alignment of the contour of the mold cavity 8.

[0034] Combined with Figure 6 As shown, in this embodiment, wiring grooves 132 are provided on both sides of the mounting groove 131 of the mounting plate 13. A wire pressing plate 16 is provided at the connection between the wiring groove 132 and the mounting groove 131. The mounting plate 13 separates the runner plate 6 and the connecting wire, avoiding damage to the protective layer of the connecting wire due to high temperature. The connecting wire is fixed by the wire pressing plate 16, preventing the connecting wire from getting stuck between the mounting plate 13 and the cover plate 12, facilitating the assembly of the mold, and avoiding the phenomenon of copper wire exposure and short circuit.

[0035] Combined with Figures 5-8 As shown, in this embodiment, the positioning seat 31 is provided with a protrusion 312, a first threaded hole 313 provided in the protrusion 312, a second threaded hole 314 circumferentially distributed outside the protrusion 312, and a shaping groove 315 provided on one side of the protrusion 312. The inner core member 32 is clamped to the positioning seat 31 through the protrusion 312 and connected to the positioning seat 31 through the first threaded hole 313. The outer core member 33 is connected to the positioning seat 31 through the second threaded hole 314. The shaping groove 315 is provided with a feed hole 316. The output end of the hot nozzle tube 5 extends to the shaping groove 315, and the material is injected into the mold cavity 8 through the feed hole 316. The upper fixed template 14 is provided with an air inlet channel 141 and an air outlet channel 142. The positioning seat 31 is provided with a first cooling groove 317 and a second cooling groove 318 respectively communicating with the air inlet channel 141 and the air outlet channel 142. The outer core member 33 is provided with a transfer groove 321 communicating the first cooling groove 317 and the second cooling groove 318, and the outer core member 33 is provided with two groups of symmetrically distributed transfer grooves 321.

[0036] Combined with Figure 9As shown, in this embodiment, the lower die base 2 includes an upper movable template 21, a lower movable template 22, and a bottom plate 23 that are connected in sequence from top to bottom. The upper movable template 21 is provided with a positioning plate 24 for positioning the lower die core 4. The lower movable template 22 and the bottom plate 23 are combined to form a second countersunk groove 221 for installing the lower die core 4. The lower die core 4 is provided with a second step portion 41 corresponding to the second countersunk groove 221. The bottom plate 23 is provided with a cooling channel 231 corresponding to the lower die core 4. The lower die core 4 is provided with a sealing groove 42 for installing a sealing ring at the second step portion 41. The second countersunk groove 221 is provided with a second positioning surface 222 for restricting the rotation direction of the lower die core.

[0037] The working principle of the present utility model is as follows: The injection molding machine injects the high-temperature molten material from the injection hole 11, divides the material into each hot nozzle tube 5 through the runner plate 6, and injects the material into each cavity 8 by the hot nozzle tube 5. Among them, the positioning seat 31 forms the outer contour of the injection molded part through the combination of the inner core part 32 and the outer core part 33. The lower die core 4 forms the inner contour of the injection molded part and forms a closed cavity 8. When the injection molded part is formed, cold air is respectively passed through the upper movable template 21 and the bottom plate 23 to cool the upper die core assembly 3 and the lower die core 4, so that the injection molded part is quickly cooled and formed; when the injection molded part is cooled and demolded, the runner plate 6 is externally connected to the control box through the runner plate joint 7 and realizes precise temperature control. After reheating the material in the hot nozzle tube 5 to the liquefied state, it is injected again to achieve waste-free production, reduce the material cost, and is suitable for producing medical devices with extremely high material requirements.

[0038] In addition to the above embodiments, the present utility model can also have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model.

Claims

1. A hot runner injection mold, characterized in that: The invention comprises an upper mold base (1), a lower mold base (2), an upper mold core assembly (3), a lower mold core (4), a hot nozzle tube (5), a flow channel plate (6) and a flow channel plate joint (7); the upper mold base (1) and the lower mold base (2) are respectively connected with an upper mold core assembly (3) and a lower mold core (4) distributed in a rectangular array; the upper mold core assembly (3) comprises a positioning base (31), and an inner mold core piece (32) and an outer mold core piece (33) installed on both sides of the positioning base (31); the lower mold core (4) is arranged between the inner mold core piece (32) and the outer mold core piece (33) and is combined to form a mold cavity (8) for injection molding; the upper mold base (1) is provided with an injection hole (11); the injection hole (11) is connected to the hot nozzle tube (5) through the flow channel plate (6); and the hot nozzle tube (5) has a delivery port (8) disposed between the inner mold core piece (32) and the outer mold core piece (33). The outlet end passes through the positioning seat (31) and extends to the mold cavity (8); the outer side of the upper mold seat (1) is connected to a flow channel plate connector (7) for electrically connecting to the flow channel plate (6); the upper mold seat (1) comprises a cover plate (12), a mounting plate (13), an upper fixed mold plate (14) and a lower fixed mold plate (15) which are connected in sequence from top to bottom; the injection hole (11) is arranged at the center of the cover plate (12); the mounting plate (13) is provided with a mounting groove (131) for mounting the hot nozzle tube (5) and the flow channel plate (6); the upper fixed mold plate (14) and the lower fixed mold plate (15) are combined to form a first countersunk groove (151) for mounting the upper mold core assembly (3); and the positioning seat (31) is provided with a first step portion (311) corresponding to the first countersunk groove (151).

2. A hot runner injection mold according to claim 1, characterized in that: The first countersunk groove (151) is provided with a first positioning surface (152) for limiting the rotation direction of the positioning seat (31).

3. A hot runner injection mold according to claim 1, characterized in that: The mounting plate (13) is provided with wiring grooves (132) on both sides of the mounting groove (131), and a wire pressing plate (16) is provided at the connection between the wiring groove (132) and the mounting groove (131).

4. A hot runner injection mold according to claim 1, characterized in that: The positioning seat (31) is provided with a protrusion (312), a first threaded hole (313) provided in the protrusion (312), a second threaded hole (314) circumferentially distributed on the outside of the protrusion (312), and a shaping groove (315) provided on one side of the protrusion (312); the inner core piece (32) is clamped to the positioning seat (31) through the protrusion (312) and connected to the positioning seat (31) through the first threaded hole (313); the outer core piece (33) is connected to the positioning seat (31) through the second threaded hole (314); the shaping groove (315) is provided with a feed hole (316); the output end of the hot nozzle pipe (5) extends to the shaping groove (315), and the material is injected into the mold cavity (8) through the feed hole (316).

5. A hot runner injection mold according to claim 4, characterized in that: The upper fixed mold plate (14) is provided with an air inlet (141) and an air outlet (142); the positioning seat (31) is provided with a first cooling groove (317) and a second cooling groove (318) respectively connected to the air inlet (141) and the air outlet (142); and the outer core member (33) is provided with a transition groove (321) connecting the first cooling groove (317) and the second cooling groove (318).

6. A hot runner injection mold according to claim 5, characterized in that: The outer core piece (33) is provided with two groups of symmetrically distributed transfer grooves (321).

7. The hot runner injection mold according to claim 1, characterized in that: The lower die base (2) comprises an upper movable die plate (21), a lower movable die plate (22) and a bottom plate (23) which are connected in sequence from top to bottom; the upper movable die plate (21) is provided with a positioning plate (24) for positioning the lower die core (4); the lower movable die plate (22) and the bottom plate (23) are combined to form a second countersunk groove (221) for mounting the lower die core (4); and the lower die core (4) is provided with a second step portion (41) corresponding to the second countersunk groove (221).

8. A hot runner injection mold according to claim 7, characterized in that: The bottom plate (23) is provided with a cooling channel (231) corresponding to the lower mold core (4), and the lower mold core (4) is provided with a sealing groove (42) for installing a sealing ring at the second step portion (41).

9. A hot runner injection mold according to claim 8, characterized in that: The second countersunk groove (221) is provided with a second positioning surface (222) for limiting the rotation direction of the lower mold core (4).

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