Vacuumizing mechanism for automobile silica gel lens injection mold

Abstract

The utility model provides a vacuumizing mechanism for an automobile silica gel lens injection mold, and belongs to the technical field of molds. The mold comprises a lower mold insert and a first color lens shell formed at the top end of the lower mold insert, a silica gel lens forming cavity is formed between the first color lens shell and the lower mold insert, and an exhaust hole is formed in the connecting position of the top end of the lower mold insert and the silica gel lens forming cavity. And a vacuumizing mechanism capable of exhausting air from the silica gel lens forming cavity through the exhaust hole is also arranged in the lower mold insert. After the first color lens shell is subjected to injection molding, silica gel liquid is injected into the silica gel lens forming cavity between the first color lens shell and the lower mold insert, so that the silica gel lens can be subjected to injection molding; and air in the silica gel lens forming cavity can be pumped out through the vacuumizing mechanism, so that air trapping at the bottom of the cavity during silica gel liquid injection molding is prevented, and the injection molding efficiency of a product can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds and relates to a vacuum pumping mechanism for an automobile silicone lens injection mold. Background Art

[0002] During the injection molding of silicone lenses, the mold is made of thin steel according to optical requirements. The thickest area of ​​the material is currently 0.7mm and the thinnest is 0.1mm. The insert is made of SKD-11 material. This material has good polishing performance and is quenched to a hardness of HRC56 or above before processing. Only in this way can the 0.1mm not be deformed during the processing. However, since the insert is already thin steel, it is impossible to design a venting insert on the mold. Mold flow analysis shows that there is trapped air on the optical surface of the product. After the trapped air is generated, there will be defects such as air marks, material shortage, and fogging during the silicone liquid filling process.

[0003] For example, a Chinese patent discloses an injection mold exhaust mechanism [application number: 202020455372.4], including an exhaust mechanism, an upper mold core and a lower mold core, the exhaust mechanism is installed on the upper surface of the lower mold core, the exhaust mechanism includes an insert seat, a through hole is opened on the left side of the insert seat, and two sockets are opened on the right side of the insert seat. A decomposition block 1 is provided on the top of the insert seat, and a decomposition block 2 is provided on the top of the decomposition block 1. The thickness of the decomposition block 2 is twice the thickness of the decomposition block 1, and two sockets are opened in the middle of the decomposition block 2. Utility Model Content

[0004] The utility model aims to solve the above problems and provides a vacuum pumping mechanism for an automobile silicone lens injection mold.

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

[0006] A vacuum pumping mechanism for an automotive silicone lens injection mold comprises a lower mold insert and a color lens shell formed at the top of the lower mold insert, a silicone lens molding cavity is formed between the color lens shell and the lower mold insert, an exhaust hole is provided at the connection between the top of the lower mold insert and the silicone lens molding cavity, and a vacuum pumping mechanism capable of extracting air from the silicone lens molding cavity through the exhaust hole is also provided in the lower mold insert.

[0007] In the above-mentioned vacuum pumping mechanism for the automotive silicone lens injection mold, the vacuum pumping mechanism includes a main exhaust channel vertically arranged in the lower mold insert, the exhaust hole is connected to the top of the main exhaust channel, a needle-rod exhaust valve structure is arranged in the main exhaust channel, and the side of the lower mold insert is also provided with an exhaust structure connected to the main exhaust channel.

[0008] In the above-mentioned vacuum extraction mechanism for the automotive silicone lens injection mold, the needle rod type exhaust valve structure includes a needle rod vertically arranged in the main exhaust channel, the inner diameter of the main exhaust channel is larger than the diameter of the needle rod, the inner diameter of the exhaust hole is equal to the diameter of the needle rod, and the circumferential surface of the upper section of the needle rod is also provided with an exhaust groove structure that can connect the silicone lens molding cavity and the main exhaust channel, and the lower side of the lower mold insert is also provided with a needle rod driving assembly that can drive the needle rod to vertically rise and fall.

[0009] In the above-mentioned vacuum pumping mechanism for the automotive silicone lens injection mold, the exhaust groove structure includes a plurality of exhaust grooves circumferentially arranged on the upper section of the needle rod, and the length of the exhaust groove in the axial direction of the needle rod is greater than the length of the exhaust hole.

[0010] In the above-mentioned vacuum pumping mechanism for the automotive silicone lens injection mold, the bottom of the main exhaust flow channel passes through the lower mold insert.

[0011] In the above-mentioned vacuum extraction mechanism for the automotive silicone lens injection mold, the needle bar driving assembly includes a needle bar mounting seat fixed to the bottom of the lower mold insert, the bottom of the needle bar is slidably matched with the needle bar mounting seat, the top of the needle bar is inserted from the bottom of the main exhaust flow channel into the main exhaust flow channel, and the bottom end of the needle bar vertically passes through the needle bar mounting seat. The lower side of the needle bar mounting seat is also provided with a needle bar lifting assembly that can drive the needle bar to move vertically upward, and the needle bar mounting seat is also provided with a needle bar pulling back structure that can drive the needle bar to move vertically downward.

[0012] In the above-mentioned vacuum extraction mechanism for the automotive silicone lens injection mold, the needle rod lifting assembly includes a slider seat, a lifting cylinder is horizontally arranged on one side of the slider seat, a lifting slider is slidably connected to the slider seat, the lifting slider is connected to the output shaft of the lifting cylinder, the upper end surface of the lifting slider is provided with a lower lifting inclined surface, and the bottom of the needle rod is provided with an upper lifting inclined surface.

[0013] In the above-mentioned vacuum pumping mechanism for the automotive silicone lens injection mold, the needle bar pull-back structure includes an annular baffle plate arranged on the needle bar, and a pull-back spring is arranged on the upper side of the annular baffle plate.

[0014] In the above-mentioned vacuum pumping mechanism for the automotive silicone lens injection mold, a sealing ring is further provided at the connection between the needle rod mounting seat and the main exhaust flow channel, and the sealing ring is sleeved on the needle rod.

[0015] In the above-mentioned vacuum extraction mechanism for the automotive silicone lens injection mold, the exhaust structure includes a horizontally arranged auxiliary exhaust channel, the inner end of the auxiliary exhaust channel is connected to the main exhaust channel, and the outer end of the auxiliary exhaust channel is connected to a horizontally arranged vacuum pump connection joint.

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

[0017] 1. After the No. 1 color lens shell is injection molded, silicone liquid is injected into the silicone lens molding cavity between the No. 1 color lens shell and the lower mold insert to injection mold the silicone lens. Before the silicone liquid is injected, the air in the silicone lens molding cavity can be extracted through a vacuum mechanism to prevent air entrapment at the bottom of the cavity during the silicone liquid injection, which can effectively improve the injection molding efficiency of the product.

[0018] 2. The needle bar driving assembly drives the needle bar to rise so that the needle bar can protrude from the upper end surface of the lower mold insert. At this time, the upper end of the exhaust groove structure is connected to the silicone lens molding cavity, and the lower end of the exhaust groove structure is connected to the main exhaust flow channel. At this time, the air in the silicone lens molding cavity can be extracted through the main exhaust flow channel. After the silicone lens molding cavity is vacuumed, the needle bar driving assembly drives the needle bar down again to return the needle bar to the exhaust hole. The needle bar and the exhaust hole form a sealing fit, and the silicone liquid can be injected at this time.

[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 schematic diagram of the overall structure of the utility model;

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

[0022] Figure 3 It is a partial structural schematic diagram of the utility model;

[0023] Figure 4 yes Figure 3 A magnified schematic diagram of center A.

[0024] In the figure, the lower mold insert 1, the No. 1 color lens shell 2, the silicone lens molding cavity 3, the exhaust hole 4, the main exhaust flow channel 5, the needle rod type exhaust valve structure 6, the needle rod 7, the exhaust groove 8, the needle rod mounting seat 9, the slider seat 10, the lifting cylinder 11, the lifting slider 12, the lower lifting slope 13, the upper lifting slope 14, the annular baffle 15, the pull-back spring 16, the sealing ring 17, the auxiliary exhaust flow channel 18, and the vacuum pump connecting joint 19. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 4As shown, a vacuum extraction mechanism for an automotive silicone lens injection mold comprises a lower mold insert 1 and a number-one color lens shell 2 formed at the top end of the lower mold insert 1, a silicone lens molding cavity 3 is formed between the number-one color lens shell 2 and the lower mold insert 1, an exhaust hole 4 is provided at the connection between the top end of the lower mold insert 1 and the silicone lens molding cavity 3, and a vacuum extraction mechanism capable of extracting air from the silicone lens molding cavity 3 through the exhaust hole 4 is also provided in the lower mold insert 1.

[0026] In the utility model, after the No. 1 color lens shell is injection molded, silicone liquid is injected into the silicone lens molding cavity 3 between the No. 1 color lens shell 2 and the lower mold insert 1 to injection mold the silicone lens. Before the silicone liquid is injected, the air in the silicone lens molding cavity 3 can be extracted by a vacuum pumping mechanism to prevent air entrapment at the bottom of the cavity during the silicone liquid injection, which can effectively improve the injection molding efficiency of the product.

[0027] Specifically, the vacuum mechanism includes a main exhaust channel 5 vertically arranged in the lower mold insert 1, the exhaust hole 4 is connected to the top of the main exhaust channel 5, a needle-bar exhaust valve structure 6 is arranged in the main exhaust channel 5, and the side of the lower mold insert 1 is also provided with an exhaust structure connected to the main exhaust channel 5. When the needle-bar exhaust valve structure 6 is opened, the exhaust hole 4 is connected to the exhaust structure, and the air in the silicone lens molding cavity 3 can be discharged from the exhaust structure.

[0028] Specifically, the needle rod exhaust valve structure 6 includes a needle rod 7 vertically arranged in the main exhaust flow channel 5, the inner diameter of the main exhaust flow channel 5 is larger than the diameter of the needle rod 7, the inner diameter of the exhaust hole 4 is equal to the diameter of the needle rod 7, and the circumferential surface of the upper section of the needle rod 7 is also provided with an exhaust groove structure that can connect the silicone lens molding cavity 3 and the main exhaust flow channel 5, and the lower side of the lower mold insert 1 is also provided with a needle rod driving assembly that can drive the needle rod 7 to vertically rise and fall. The needle rod driving assembly drives the needle rod 7 to rise so that the needle rod protrudes from the upper end surface of the lower mold insert. At this time, the upper end of the exhaust groove structure is connected to the silicone lens molding cavity 3, and the lower end of the exhaust groove structure is connected to the main exhaust flow channel 5. At this time, the air in the silicone lens molding cavity 3 can be extracted through the main exhaust flow channel. After the silicone lens molding cavity 3 is vacuumed, the needle rod driving assembly drives the needle rod 7 to descend again to return the needle rod to the exhaust hole. The needle rod and the exhaust hole form a sealed fit, and the silicone liquid can be injected at this time.

[0029] Specifically, the exhaust groove structure includes a plurality of exhaust grooves 8 circumferentially arranged on the upper section of the needle rod 7, and the length of the exhaust groove 8 in the axial direction of the needle rod 7 is greater than the length of the exhaust hole 4. After the needle rod moves upward, the upper end of the exhaust groove 8 can be connected to the silicone lens molding cavity 3. When air is exhausted, the air enters the main exhaust flow channel through the channel formed by the exhaust hole and the exhaust groove, and then is discharged outward through the exhaust structure.

[0030] Specifically, the bottom of the main exhaust channel 5 passes through the lower mold insert 1, and the needle bar drive assembly includes a needle bar mounting seat 9 fixed to the bottom of the lower mold insert 1. The bottom of the needle bar 7 is slidably matched with the needle bar mounting seat 9, and the top of the needle bar 7 is inserted from the bottom of the main exhaust channel 5 into the main exhaust channel 5. The bottom end of the needle bar 7 vertically passes through the needle bar mounting seat 9. The lower side of the needle bar mounting seat 9 is also provided with a needle bar lifting assembly that can drive the needle bar 7 to move vertically upward, and the needle bar mounting seat 9 is also provided with a needle bar pull-back structure that can drive the needle bar 7 to move vertically downward. The needle bar lifting assembly can drive the needle bar 7 to move vertically upward, and the needle bar pull-back structure can drive the needle bar to move vertically downward.

[0031] Specifically, the needle bar lifting assembly includes a slider seat 10, a lifting cylinder 11 is horizontally arranged on one side of the slider seat 10, a lifting slider 12 is slidably connected to the slider seat 10, the lifting slider 12 is connected to the output shaft of the lifting cylinder 11, the upper end surface of the lifting slider 12 is provided with a lower lifting slope 13, the bottom of the needle bar 7 is provided with an upper lifting slope 14, and the needle bar pull-back structure includes an annular baffle 15 arranged on the needle bar 7, and a pull-back spring 16 is arranged on the upper side of the annular baffle 15.

[0032] The lifting cylinder 11 can drive the lifting slider 12 to move horizontally. The lifting slider moves toward the needle rod and can drive the needle rod to move vertically upward through the cooperation of the lower lifting slope 13 and the upper lifting slope. When the lifting cylinder 11 drives the lifting slider 12 to move away from the needle rod, the return spring 16 can apply a downward thrust to the annular baffle 15, thereby driving the needle rod to move downward.

[0033] Preferably, a sealing ring 17 is further provided at the connection between the needle rod mounting seat 9 and the main exhaust flow channel 5, and the sealing ring 17 is sleeved on the needle rod 7. The sealing ring can prevent air leakage at the lower end of the main exhaust flow channel.

[0034] Specifically, the exhaust structure includes a horizontally arranged auxiliary exhaust channel 18, the inner end of the auxiliary exhaust channel 18 is connected to the main exhaust channel 5, and the outer end of the auxiliary exhaust channel 18 is connected to a horizontally arranged vacuum pump connection joint 19. The vacuum pump connection joint 19 can be externally connected to a vacuum pump, and the vacuum pump can extract the air in the silicone lens molding cavity 3 through the auxiliary exhaust channel 18, the main exhaust channel 5 and the exhaust hole.

[0035] The working principle of the utility model is as follows: after the first color lens shell is injection molded, silicone liquid is injected into the silicone lens molding cavity 3 between the first color lens shell 2 and the lower mold insert 1 to injection mold the silicone lens. Before the silicone liquid is injected, the air in the silicone lens molding cavity 3 can be extracted by a vacuum pumping mechanism to prevent air from being trapped at the bottom of the cavity during the silicone liquid injection, which can effectively improve the injection molding efficiency of the product.

[0036] When the needle-bar exhaust valve structure 6 is opened, the exhaust hole 4 is connected to the exhaust structure, and the air in the silicone lens molding cavity 3 can be discharged from the exhaust structure. The needle bar driving assembly drives the needle bar 7 to rise so that the needle bar protrudes from the upper end surface of the lower mold insert. At this time, the upper end of the exhaust groove structure is connected to the silicone lens molding cavity 3, and the lower end of the exhaust groove structure is connected to the main exhaust flow channel 5. At this time, the air in the silicone lens molding cavity 3 can be extracted through the main exhaust flow channel. After the silicone lens molding cavity 3 is evacuated, the needle bar driving assembly drives the needle bar 7 to descend again to return the needle bar to the exhaust hole. The needle bar and the exhaust hole form a sealing fit. At this time, the silicone liquid can be injected. After the needle bar moves upward, The upper end of the exhaust groove 8 is connected to the silicone lens molding cavity 3. When the air is exhausted, the air enters the main exhaust flow channel through the channel formed by the exhaust hole and the exhaust groove, and is then discharged outward through the exhaust structure. The needle rod lifting assembly can drive the needle rod 7 to move vertically upward, and the needle rod pull-back structure can drive the needle rod to move vertically downward. The lifting cylinder 11 can drive the lifting slider 12 to move horizontally. The lifting slider moves toward the needle rod and can drive the needle rod to move vertically upward through the cooperation of the lower lifting slope 13 and the upper lifting slope. When the lifting cylinder 11 drives the lifting slider 12 to move away from the needle rod, the pull-back spring 16 can apply a downward thrust to the annular baffle 15, thereby driving the needle rod to move downward.

[0037] The sealing ring can prevent air leakage at the lower end of the main exhaust flow channel. The vacuum pump connection joint 19 can be connected to an external vacuum pump. The vacuum pump can extract the air in the silicone lens molding cavity 3 through the auxiliary exhaust flow channel 18, the main exhaust flow channel 5 and the exhaust hole.

[0038] 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, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0039] Although this article makes more frequent use of the lower mold insert 1, the No. 1 color lens housing 2, the silicone lens molding cavity 3, the exhaust hole 4, the main exhaust channel 5, the needle rod type exhaust valve structure 6, the needle rod 7, the exhaust groove 8, the needle rod mounting seat 9, the slider seat 10, the lifting cylinder 11, the lifting slider 12, the lower lifting slope 13, the upper lifting slope 14, the annular baffle 15, the return spring 16, the sealing ring 17, the auxiliary exhaust channel 18, the vacuum pump connecting joint 19, etc., these terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A vacuum pumping mechanism for an automotive silicone lens injection mold, comprising a lower mold insert (1) and a first color lens housing (2) formed on the top of the lower mold insert (1), characterized in that: A silicone lens molding cavity (3) is formed between the No. 1 color lens housing (2) and the lower mold insert (1), an exhaust hole (4) is provided at the connection between the top end of the lower mold insert (1) and the silicone lens molding cavity (3), and a vacuum extraction mechanism capable of extracting air from the silicone lens molding cavity (3) through the exhaust hole (4) is also provided in the lower mold insert (1).

2. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 1, characterized in that: The vacuum extraction mechanism comprises a main exhaust channel (5) vertically arranged in the lower mold insert (1), the exhaust hole (4) is connected to the top of the main exhaust channel (5), a needle-type exhaust valve structure (6) is arranged in the main exhaust channel (5), and the side of the lower mold insert (1) is also provided with an exhaust structure connected to the main exhaust channel (5).

3. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 2, characterized in that: The needle rod type exhaust valve structure (6) comprises a needle rod (7) vertically arranged in the main exhaust channel (5), the inner diameter of the main exhaust channel (5) is larger than the diameter of the needle rod (7), the inner diameter of the exhaust hole (4) is equal to the diameter of the needle rod (7), and the circumferential surface of the upper section of the needle rod (7) is also provided with an exhaust groove structure capable of connecting the silicone lens molding cavity (3) and the main exhaust channel (5), and the lower side of the lower mold insert (1) is also provided with a needle rod driving component capable of driving the needle rod (7) to vertically rise and fall.

4. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 3, characterized in that: The exhaust groove structure comprises a plurality of exhaust grooves (8) arranged circumferentially on the upper section of the needle rod (7), and the length of the exhaust groove (8) in the axial direction of the needle rod (7) is greater than the length of the exhaust hole (4).

5. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 3, characterized in that: The bottom of the main exhaust flow channel (5) passes through the lower mold insert (1).

6. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 5, characterized in that: The needle bar driving assembly comprises a needle bar mounting seat (9) fixed at the bottom of the lower mold insert (1); the bottom of the needle bar (7) is slidably matched with the needle bar mounting seat (9); the top of the needle bar (7) is inserted from the bottom of the main exhaust channel (5) into the main exhaust channel (5); the bottom end of the needle bar (7) vertically passes through the needle bar mounting seat (9); the lower side of the needle bar mounting seat (9) is also provided with a needle bar lifting assembly capable of driving the needle bar (7) to move vertically upward; and the needle bar mounting seat (9) is also provided with a needle bar pulling back structure capable of driving the needle bar (7) to move vertically downward.

7. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 6, characterized in that: The needle bar lifting assembly comprises a slider seat (10), a lifting cylinder (11) is horizontally arranged on one side of the slider seat (10), a lifting slider (12) is slidably connected to the slider seat (10), the lifting slider (12) is connected to the output shaft of the lifting cylinder (11), the upper end surface of the lifting slider (12) is provided with a lower lifting inclined surface (13), and the bottom of the needle bar (7) is provided with an upper lifting inclined surface (14).

8. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 6, characterized in that: The needle bar pull-back structure comprises an annular baffle (15) arranged on the needle bar (7), and a pull-back spring (16) is arranged on the upper side of the annular baffle (15).

9. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 6, characterized in that: A sealing ring (17) is also provided at the connection between the needle rod mounting seat (9) and the main exhaust flow channel (5), and the sealing ring (17) is sleeved on the needle rod (7).

10. The vacuum pumping mechanism for the automotive silicone lens injection mold according to claim 2, characterized in that: The exhaust structure comprises a horizontally arranged secondary exhaust flow channel (18), the inner end of the secondary exhaust flow channel (18) is connected to the main exhaust flow channel (5), and the outer end of the secondary exhaust flow channel (18) is connected to a horizontally arranged vacuum pump connection joint (19).

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