Air trapping and discharging mechanism of injection mold for double-color lens of automobile headlight

Abstract

The utility model belongs to the technical field of molds, and particularly relates to an air trapping and discharging mechanism of an injection mold for a double-color lens of an automobile headlight. The double-color lens injection mold comprises a double-color lens injection lower mold and a double-color lens injection upper mold. Before the step of double-color injection molding, due to the fact that the mold needs to be opened and the double-color lens injection molding lower mold needs to be rotated, gas is likely to appear in a cavity and a mold closing gap in the secondary mold closing process, and at the moment, trapped gas in the mold after secondary mold closing can be exhausted through the multi-directional trapped gas exhaust assembly; the injection molding device has the advantages that poor quality of plastic parts due to influence of gas is avoided, the quality of the plastic parts and the injection molding accuracy are improved, multidirectional exhaust is realized, the practicability is high, the molded plastic parts can be ejected and demolded through the ejection demolding part after injection molding is completed, and the ejection area is large.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to an air-trapped discharge mechanism of an injection mold for a two-color light distribution mirror of a car headlight. Background Art

[0002] When using injection molds to produce two-color mirror plastic products, after the first injection, the movable mold (lower mold) needs to be opened and rotated before the second color of the material is injected. At present, during the injection molding process of most two-color mirror injection molds, gas easily enters the cavity before and after the second mold closing and inside the mold, forming trapped air after the mold closing, which will affect the surface quality of the plastic parts and have poor accuracy. Therefore, it is urgent to design a trapped air discharge mechanism for the injection mold of the two-color mirror for automobile headlights that can overcome the above defects.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses a two-color headlight mirror injection mold [application number: 201910821619.1]. The injection mold includes a first fixed mold, a second fixed mold and two movable molds. Each movable mold includes a main body and a suspended core-pulling body. The suspended core-pulling body is connected to the main body through an elastic member, and the elastic member is in a pre-tightened state. The first fixed mold is molded with any movable mold to inject the first color injection molded part. At this time, the suspended core-pulling body is accommodated in the groove of the first fixed mold. After the injection molding is completed, the first color injection molded part remains on the movable mold. The second fixed mold is molded with the movable mold carrying the first color injection molded part to inject the second color injection molded part. The second fixed mold is provided with a push portion at a predetermined position. During the mold closing process, the push portion pushes the suspended core-pulling body to the injection position and performs injection molding to form a two-color headlight mirror. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a trapped air discharge mechanism for an injection mould of a two-colour light distribution mirror for a car headlight.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A trapped air discharge mechanism of a two-color mirror injection mold for a car headlight, comprising a two-color mirror injection lower mold and a two-color mirror injection upper mold, a two-color injection molded part is arranged above the two-color mirror injection upper mold, two first molding upper inserts and two second molding upper inserts are arranged at the bottom of the two-color mirror injection upper mold, two first molding lower inserts and a second molding lower insert are arranged in the two-color mirror injection lower mold, the first molding upper insert is arranged opposite to the first molding lower insert and has a matching shape, the second molding upper insert is arranged opposite to the second molding lower insert and has a matching shape, a multi-directional trapped air discharge component is arranged in the second molding upper insert, and an ejection demolding part is arranged below the two-color mirror injection lower mold.

[0007] In the above-mentioned trapped air exhaust mechanism of the automobile headlight two-color mirror injection mold, the multi-directional trapped air exhaust component includes a cavity exhaust part and a mold closing cavity exhaust part arranged in the second molding upper insert, and the cavity exhaust part and the mold closing cavity exhaust part respectively pass through the two-color mirror injection upper mold.

[0008] In the above-mentioned trapped air exhaust mechanism of the automobile headlight two-color lens injection mold, the cavity exhaust part includes a cavity exhaust pipe arranged in the second molding upper insert, the second molding upper insert has a second molding protrusion, and the inlet of the cavity exhaust pipe extends outside the second molding protrusion.

[0009] In the above-mentioned trapped air exhaust mechanism of the automobile headlight two-color mirror injection mold, the mold cavity exhaust part includes a mold cavity exhaust pipe arranged in the second molding upper insert.

[0010] In the above-mentioned trapped air discharge mechanism of the automobile headlight two-color mirror injection mold, an exhaust valve fixing plate is provided on the side of the two-color mirror injection upper mold, and the cavity exhaust pipe and the mold cavity exhaust pipe are respectively connected to the exhaust valve fixing plate through air pipes.

[0011] In the above-mentioned trapped air discharge mechanism of the injection mold for the two-color mirror of the automobile headlight, the second molding lower insert seat has a second molding recess, and the second molding recess is matched with the shape of the second molding protrusion.

[0012] In the above-mentioned trapped air discharge mechanism of the injection mold for the two-color mirror of the automobile headlight, the first upper molding seat has a first molding protrusion, and the first lower molding seat has a first molding recess, and the shapes of the first molding protrusion and the first molding recess are matched.

[0013] In the above-mentioned trapped air discharge mechanism of the automobile headlight two-color mirror injection mold, the two-color injection molded part includes an injection main board arranged above the two-color mirror injection upper mold, and the injection main board is provided with a first injection cylinder and a second injection cylinder.

[0014] In the above-mentioned trapped air discharge mechanism of the automobile headlight two-color lens injection mold, the ejection demolding part includes an ejection fixing plate arranged below the two-color lens injection lower mold, and a plurality of straight ejector rods are provided on the ejection fixing plate.

[0015] In the above-mentioned trapped air discharge mechanism of the injection mold for the two-color mirror of the automobile headlight, a plurality of inclined ejector rods are further provided on the ejection fixing plate, and the straight ejector rods and the inclined ejector rods are arranged alternately.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. In the two-color injection molding process of the utility model, the monochrome material is first injected into the first cavity formed by the first molding upper insert and the first molding lower insert through the two-color injection molding part. After the injection molding is completed, the mold is opened, and the two-color mirror injection molding lower mold is rotated so that the molded monochrome plastic part moves to the second cavity formed by the first molding lower insert and the second molding upper insert. Then, the material of another color is injected into the second cavity through the two-color injection molding part to complete the two-color injection molding. Before the two-color injection molding step, since it is necessary to open the mold and rotate the two-color mirror injection molding lower mold, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the trapped gas in the mold after the secondary mold closing can be discharged through the multi-directional trapped gas exhaust component, so as to avoid the poor quality of the plastic part due to the influence of gas, improve the quality of the plastic part and the injection molding accuracy, realize multi-directional exhaust, and have strong practicality. After the injection molding is completed, the molded plastic part can be ejected and demolded by the ejection demolding part, and the ejection area is large.

[0018] 2. The ejection fixing plate in the utility model is used to connect and fix the straight ejector rod and the inclined ejector rod. After the injection molding is completed, the mold is opened, and the straight ejector rod and the inclined ejector rod are moved to eject the molded plastic parts. The straight and inclined ejector combined ejection structure is adopted, and the ejection area is large and the ejection range is wide.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the upper mold for injection molding of a two-color light distribution mirror.

[0021] Figure 2 It is a schematic diagram of the partial structure of the upper mold for injection molding of a two-color light distribution mirror.

[0022] Figure 3 It is a structural schematic diagram of the other direction of the double-color light distribution mirror injection mold.

[0023] Figure 4 It is a structural schematic diagram of the lower mold for injection molding of a two-color light distribution mirror.

[0024] Figure 5 It is a schematic diagram of the structure of the ejector.

[0025] In the figure: two-color light distribution mirror injection lower mold 1, two-color light distribution mirror injection upper mold 2, two-color injection molded part 3, first molding upper insert 4, second molding upper insert 5, first molding lower insert 6, second molding lower insert 7, multi-directional trapped air exhaust component 8, ejection demolding part 9, cavity exhaust part 10, mold closing chamber exhaust part 11, cavity exhaust pipe 12, second molding protrusion 13, mold closing chamber exhaust pipe 14, exhaust valve fixing plate 15, second molding recess 16, first molding protrusion 17, first molding recess 18, injection main board 19, first injection molding cylinder 20, second injection molding cylinder 21, ejection fixing plate 22, straight ejector 23, inclined ejector 24. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1-5 As shown, a trapped air discharge mechanism of a two-color mirror injection mold for a vehicle headlight comprises a two-color mirror injection lower mold 1 and a two-color mirror injection upper mold 2, a two-color injection molded part 3 is arranged above the two-color mirror injection upper mold 2, two first molding upper inserts 4 and two second molding upper inserts 5 are arranged at the bottom of the two-color mirror injection upper mold 2, two first molding lower inserts 6 and second molding lower inserts 7 are arranged in the two-color mirror injection lower mold 1, the first molding upper insert 4 is arranged opposite to the first molding lower insert 6 and has a matching shape, the second molding upper insert 5 is arranged opposite to the second molding lower insert 7 and has a matching shape, a multi-directional trapped air discharge component 8 is arranged in the second molding upper insert 5, and a demolding part 9 is arranged below the two-color mirror injection lower mold 1.

[0028] In this embodiment, during the two-color injection molding process, the monochrome material is first injected into the first cavity formed by the first molding upper insert 4 and the first molding lower insert 6 through the two-color injection molding part 3. After the injection molding is completed, the mold is opened and the two-color mirror injection molding lower mold 1 is rotated so that the molded monochrome plastic part moves to the second cavity formed by the first molding lower insert 6 and the second molding upper insert 5, and then the material of another color is injected into the second cavity through the two-color injection molding part 3 to complete the two-color injection molding. Before performing the two-color injection molding step, since it is necessary to open the mold and rotate the two-color mirror injection molding lower mold 1, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the trapped gas in the mold after the secondary mold closing can be discharged through the multi-directional trapped gas exhaust component 8 to avoid poor quality of the plastic part due to the influence of gas, improve the quality of the plastic part and the injection molding accuracy, realize multi-directional exhaust, and have strong practicality. After the injection molding is completed, the molded plastic part can be ejected and demolded by the ejection demolding part 9, and the ejection area is large.

[0029] Combination Figure 1-5As shown, the multi-directional trapped air exhaust assembly 8 includes a cavity exhaust portion 10 and a mold closing cavity exhaust portion 11 arranged in the second molding upper insert 5, and the cavity exhaust portion 10 and the mold closing cavity exhaust portion 11 respectively penetrate through the two-color light distribution mirror injection upper mold 2.

[0030] Specifically, before the two-color injection molding step, since it is necessary to open the mold and rotate the two-color mirror injection lower mold 1, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the cavity exhaust part 10 is used to discharge the trapped gas in the plastic part after the secondary mold closing, and the mold closing chamber exhaust part 11 can discharge the trapped gas in the mold closing part after the secondary mold closing, thereby realizing multi-directional gas discharge, avoiding quality problems of two-color plastic parts due to trapped gas, improving the quality of plastic parts and injection molding accuracy, realizing multi-directional exhaust, and having strong practicality.

[0031] The cavity exhaust portion 10 includes a cavity exhaust pipe 12 disposed in the second molding upper insert 5 . The second molding upper insert 5 has a second molding protrusion 13 . The inlet of the cavity exhaust pipe 12 extends to the outside of the second molding protrusion 13 .

[0032] In this embodiment, before the two-color injection molding step, since it is necessary to open the mold and rotate the two-color mirror injection lower mold 1, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the cavity exhaust pipe 12 is used to discharge the trapped gas in the plastic part after the secondary mold closing.

[0033] Combination Figure 1 , Figure 2 As shown, the mold cavity exhaust portion 11 includes a mold cavity exhaust pipe 14 arranged in the second molding upper insert 5.

[0034] In the present embodiment, before the two-color injection molding step is performed, since it is necessary to open the mold and rotate the two-color mirror injection lower mold 1, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the mold closing chamber exhaust pipe 14 can discharge the trapped gas in the mold closing part after the secondary mold closing, thereby realizing multi-directional gas discharge and avoiding quality problems of the two-color plastic parts due to trapped gas.

[0035] An exhaust valve fixing plate 15 is provided on the side of the double-color light distribution mirror injection upper mold 2, and the cavity exhaust pipe 12 and the mold closing chamber exhaust pipe 14 are respectively connected to the exhaust valve fixing plate 15 through air pipes.

[0036] In this embodiment, an exhaust valve is installed in the exhaust valve fixing plate 15, and the exhaust valve is connected to a suction machine. The cavity exhaust pipe 12 and the mold chamber exhaust pipe 14 are respectively connected to the exhaust valve fixing plate 15 through air pipes. When exhaust is needed, the exhaust valve is opened and the trapped air is discharged through the suction machine.

[0037] Combination Figure 1-4 As shown, a second molding recess 16 is provided in the second molding lower insert seat 7 , and the second molding recess 16 is matched with the shape of the second molding protrusion 13 .

[0038] In this embodiment, the second molding concave portion 16 matches the shape of the second molding protrusion 13 to assist in molding the plastic part.

[0039] The first upper molding seat 4 has a first molding protrusion 17 therein, and the first lower molding seat 6 has a first molding recess 18 therein, and the shapes of the first molding protrusion 17 and the first molding recess 18 are matched.

[0040] In this embodiment, the first molding protrusion 17 and the first molding recess 18 are matched in shape to assist in molding the plastic part.

[0041] Combination Figure 1-3 As shown, the two-color injection molded part 3 includes an injection molding main board 19 arranged above the two-color lens injection molding upper mold 2, and a first injection molding cylinder 20 and a second injection molding cylinder 21 are arranged in the injection molding main board 19.

[0042] In this embodiment, during the injection molding process, two materials of different colors are injected through the first injection molding cylinder 20 and the second injection molding cylinder 21 to achieve two-color injection molding.

[0043] Combination Figure 1-5 As shown, the ejection demolding member 9 includes an ejection fixing plate 22 arranged below the two-color lens injection lower mold 1, and a plurality of straight ejector rods 23 are arranged on the ejection fixing plate 22, and a plurality of inclined ejector rods 24 are also arranged on the ejection fixing plate 22, and the straight ejector rods 23 and the inclined ejector rods 24 are arranged alternately.

[0044] In this embodiment, the ejection fixing plate 22 is used to connect and fix the straight ejector rod 23 and the inclined ejector rod 24. After the injection molding is completed, the mold is opened, and the straight ejector rod 23 and the inclined ejector rod 24 are moved to eject the molded plastic part. The straight and inclined ejector combined ejection structure is adopted, which has a large ejection area and a wide ejection range.

[0045] The working principle of the utility model is:

[0046] In the two-color injection molding process, the single-color material is first injected into the first cavity formed by the first molding upper insert 4 and the first molding lower insert 6 through the first injection molding cylinder 20. After the injection molding is completed, the mold is opened, and the two-color mirror injection molding lower mold 1 is rotated to make the molded single-color plastic part move to the second cavity formed by the first molding lower insert 6 and the second molding upper insert 5. Then, the second injection molding cylinder 21 is used to inject the material of another color into the second cavity to complete the two-color injection molding. Before the two-color injection molding step, since it is necessary to open the mold and rotate the two-color mirror injection molding lower mold 1, gas is likely to appear in the cavity and the mold gap during the secondary mold closing process. At this time, the cavity exhaust pipe 12 is used to discharge the trapped gas in the plastic part after the secondary mold closing, and the mold closing chamber exhaust pipe 14 can discharge the trapped gas in the mold closing part after the secondary mold closing, so as to realize multi-directional gas discharge, avoid the quality problems of the two-color plastic part due to trapped gas, improve the quality of the plastic part and the injection molding accuracy, realize multi-directional exhaust, and have strong practicality.

[0047] An exhaust valve is installed in the exhaust valve fixing plate 15, and the exhaust valve is connected to a suction machine. The cavity exhaust pipe 12 and the mold clamping chamber exhaust pipe 14 are respectively connected to the exhaust valve fixing plate 15 through air pipes. When exhaust is required, the exhaust valve is opened and the trapped air is discharged through the suction machine.

[0048] The second molding concave portion 16 is matched with the second molding protrusion 13 in shape to assist in molding the plastic part, and the first molding protrusion 17 is matched with the first molding concave portion 18 in shape to assist in molding the plastic part.

[0049] The ejection fixing plate 22 is used to connect and fix the straight ejector rod 23 and the inclined ejector rod 24. After the injection molding is completed, the mold is opened, and the straight ejector rod 23 and the inclined ejector rod 24 are moved to eject the molded plastic part. The straight and inclined ejector combined ejection structure is adopted, and the ejection area is large and the ejection range is wide.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0051] Although this article uses more terms such as double-color light-matching mirror injection mold 1, double-color light-matching mirror injection mold 2, double-color injection molded part 3, first molding upper insert 4, second molding upper insert 5, first molding lower insert 6, second molding lower insert 7, multi-directional trapped air exhaust assembly 8, ejection demoulding part 9, cavity exhaust part 10, mold clamping cavity exhaust part 11, cavity exhaust pipe 12, second molding protrusion 13, mold clamping cavity exhaust pipe 14, exhaust valve fixing plate 15, second molding concave part 16, first molding protrusion 17, first molding concave part 18, injection main board 19, first injection molding cylinder 20, second injection molding cylinder 21, ejection fixing plate 22, straight ejector 23, inclined ejector 24, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model, and interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A trapped air discharge mechanism for a two-color mirror injection mold for a car headlight, comprising a two-color mirror injection lower mold (1) and a two-color mirror injection upper mold (2), characterized in that: A two-color injection molded part (3) is arranged above the two-color lens injection upper mold (2), two first upper molding inserts (4) and two second upper molding inserts (5) are arranged at the bottom of the two-color lens injection upper mold (2), and two first lower molding inserts (6) and second lower molding inserts (7) are arranged inside the two-color lens injection lower mold (1), the first upper molding insert (4) and the first lower molding insert (6) are arranged opposite to each other and have matching shapes, the second upper molding insert (5) and the second lower molding insert (7) are arranged opposite to each other and have matching shapes, a multi-directional trapped air discharge component (8) is arranged inside the second upper molding insert (5), and an ejection demoulding part (9) is arranged below the two-color lens injection lower mold (1).

2. The trapped air discharge mechanism of the injection mold of the dual-color light distribution mirror for automobile headlights according to claim 1 is characterized in that: The multi-directional trapped air exhaust assembly (8) comprises a cavity exhaust portion (10) and a mold closing chamber exhaust portion (11) which are arranged in the second molding upper insert (5), and the cavity exhaust portion (10) and the mold closing chamber exhaust portion (11) respectively penetrate through the two-color light distribution mirror injection upper mold (2).

3. The trapped air discharge mechanism of the injection mold for the dual-color light distribution mirror of the automobile headlight according to claim 2 is characterized in that: The cavity exhaust portion (10) comprises a cavity exhaust pipe (12) arranged in a second molding upper insert (5), wherein the second molding upper insert (5) has a second molding protrusion (13), and an inlet of the cavity exhaust pipe (12) extends outside the second molding protrusion (13).

4. The trapped air discharge mechanism of the injection mold for the dual-color light distribution mirror of the automobile headlight according to claim 3 is characterized in that: The mold clamping chamber exhaust portion (11) comprises a mold clamping chamber exhaust pipe (14) arranged in the second molding upper insert (5).

5. The trapped air discharge mechanism of the injection mold of the dual-color light distribution mirror for automobile headlights according to claim 4 is characterized in that: An exhaust valve fixing plate (15) is provided on the side of the double-color light distribution mirror injection molding upper mold (2), and the mold cavity exhaust pipe (12) and the mold closing chamber exhaust pipe (14) are respectively connected to the exhaust valve fixing plate (15) through air pipes.

6. The trapped air discharge mechanism of the injection mold for the dual-color light distribution mirror of the automobile headlight according to claim 5, characterized in that: The second molding lower insert (7) has a second molding recess (16) therein, and the second molding recess (16) is matched in shape to the second molding protrusion (13).

7. The trapped air discharge mechanism of the injection mold for the dual-color light distribution mirror of the automobile headlight according to claim 6, characterized in that: The first upper molding seat (4) has a first molding protrusion (17) therein, and the first lower molding seat (6) has a first molding recess (18) therein, and the shapes of the first molding protrusion (17) and the first molding recess (18) are matched.

8. The trapped air discharge mechanism of the injection mold for the dual-color light distribution mirror of the automobile headlight according to claim 7, characterized in that: The two-color injection molded part (3) comprises an injection molding main board (19) arranged above the two-color light distribution mirror injection molding upper mold (2), and a first injection molding cylinder (20) and a second injection molding cylinder (21) are arranged in the injection molding main board (19).

9. The trapped air discharge mechanism of the injection mold of the dual-color light distribution mirror for automobile headlights according to claim 8, characterized in that: The ejection demoulding component (9) comprises an ejection fixing plate (22) arranged below the lower injection mold (1) of the two-color light distribution mirror, and a plurality of straight ejector rods (23) are arranged on the ejection fixing plate (22).

10. The trapped air discharge mechanism of the injection mold of the dual-color light distribution mirror of the automobile headlight according to claim 9, characterized in that: The ejection fixing plate (22) is also provided with a plurality of inclined ejector rods (24), and the straight ejector rods (23) and the inclined ejector rods (24) are arranged alternately.

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