CN212979094U

CN212979094U - Precision injection mold for optical lens

Info

Publication number: CN212979094U
Application number: CN202021585791.6U
Authority: CN
Inventors: 李荣洲; 谭沿河; 姚雅兰
Original assignee: Dongguan Jingcai Optics Co ltd
Current assignee: Dongguan Jingcai Optics Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-04-16
Anticipated expiration: 2030-08-03

Abstract

The utility model provides a precision injection mold of optical lenses, which comprises a panel, an upper template, a lower die holder and a bottom plate which are arranged from top to bottom in sequence, wherein the bottom of the panel is fixed with a column, an injection main runner is arranged in the column, a prepressing lifting cavity is arranged below the upper template, a prepressing plate is connected in the prepressing lifting cavity in a sliding way, a lifting abdicating hole is arranged in the prepressing plate, n upper mold lugs are arranged at the bottom of the prepressing plate, and a first spring is connected between the prepressing plate and the prepressing lifting cavity; be equipped with n lower die cavitys on the lower bolster, be connected with the subchannel of moulding plastics between each lower die cavity, the bottom of the subchannel of moulding plastics is connected with first taking off the material hole, and lower die cavity one side is connected with first exhaust groove, overflows and glues chamber and second exhaust groove, and the bottom of second exhaust groove is connected with vertical passageway, cross-channel, and cross-channel one end is connected with vacuum joint. The utility model discloses can effectively clear away the gas in the die cavity of moulding plastics, can extrude the inside gas of discharge melting plastic after moulding plastics.

Description

Precision injection mold for optical lens

Technical Field

The utility model relates to an injection mold specifically discloses an optical lens's accurate injection mold.

Background

The injection mold is a tool for producing plastic products and also a tool for endowing the plastic products with complete structures and accurate sizes, and particularly relates to a method for injecting heated and melted plastics into a mold cavity from an injection molding machine at high pressure and obtaining a molded plastic part after cooling and solidification.

Injection mold has a large amount of air in the die cavity of moulding plastics in the compound die back, between last bed die, and the molten plastic gets into the die cavity of moulding plastics fast after, and the air in the die cavity of moulding plastics can be melted into in the molten plastic, and after cooling shaping, the air can lead to the inside defects such as gas pocket that form of plastic spare, and in addition, the air in the die cavity of moulding plastics still can hinder the molten plastic to get into, finally leads to the surface of plastic spare to form defects such as recess.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need to provide a precision injection mold for optical lenses, which can effectively remove the gas in the injection mold cavity before injection molding, and can extrude and discharge the gas inside the molten plastic in the injection mold cavity during injection molding, so as to ensure the quality of the finally obtained injection molded part.

In order to solve the prior art problem, the utility model discloses a precision injection mold of optical lens piece, including panel, cope match-plate pattern, lower bolster and the bottom plate that sets gradually from top to bottom, be equipped with the stripper chamber in the lower bolster, the bottom of panel is fixed with the stand that runs through the cope match-plate pattern, be equipped with the main runner of moulding plastics in the stand, the cope match-plate pattern has pre-compaction lift chamber, sliding connection has the preformplate in the pre-compaction lift chamber, be equipped with the lift hole of stepping down in the preformplate, the stand sliding connection is in the lift hole of stepping down, the bottom of preformplate is equipped with n and goes up the die lug, n is the integer that is greater than 1, be connected with first spring;

the lower die plate is provided with n lower die cavities respectively positioned under the upper die bumps, an injection molding sub-runner is connected between the lower die cavities and positioned under an injection molding main runner, the bottom of the injection molding sub-runner is connected with a first stripping hole, one side of each lower die cavity, which is far away from the injection molding sub-runner, is sequentially connected with a first exhaust groove, a glue overflow cavity and a second exhaust groove, the bottom of each second exhaust groove is connected with a longitudinal channel, the bottom of each longitudinal channel is connected with a transverse channel, and one end of each transverse channel, which is far away from the lower die cavity, is connected with a vacuum joint;

the stripping cavity is connected with a material ejecting plate in a sliding mode, a first ejector pin is fixed on the material ejecting plate, and the first ejector pin is connected in the first stripping hole in a sliding mode.

Furthermore, a guide hole connected to the top of the prepressing lifting cavity is further formed in the upper die plate, a guide pillar is fixed to the top of the prepressing plate, and the guide pillar is connected to the guide hole in a sliding mode.

Furthermore, a stripping groove is connected between the injection sub-runner and the first stripping hole.

Furthermore, the longitudinal channel and the transverse channel are connected to form a V-shaped channel structure.

Furthermore, the bottom of each first exhaust groove is connected with a second stripping hole, n second thimbles are fixed on the ejector plate, and each second thimble is respectively connected in each second stripping hole in a sliding manner.

Furthermore, a second spring is connected between the top of the ejector plate and the lower template.

Furthermore, an ejection yielding hole is formed in the bottom plate, a pushing block is fixed at the bottom of the ejector plate, and the pushing block is connected to the ejection yielding hole in a sliding mode.

The utility model has the advantages that: the utility model discloses an accurate injection mold of optical lens piece is provided with special exhaust structure, can effectively clear away the gas in the die cavity of moulding plastics before moulding plastics behind the compound die, and the air discharge duct of excessive gluey chamber cooperation both sides can effectively avoid melting plastic to block up exhaust passage, and exhaust effect is reliable and stable, and can extrude the inside gas of discharge in the die cavity of moulding plastics after moulding plastics, further avoids defects such as the inside gas pocket that forms of injection molding, can effectively ensure that the final injection molding that obtains is accurate reliable.

Drawings

Fig. 1 is the structure schematic diagram of the utility model during prepressing die assembly.

Fig. 2 is a schematic structural diagram of the present invention when the mold is completely closed.

Fig. 3 is a schematic structural view of the mold opening and discharging of the present invention.

The reference signs are: the injection molding device comprises a panel 10, an upper template 11, a column 12, an injection molding main runner 121, a prepressing lifting cavity 13, a guide hole 131, a prepressing plate 14, a lifting abdicating hole 141, an upper mold bump 15, a first spring 16, a guide post 17, a bottom plate 20, an ejection abdicating hole 201, a lower mold base 21, a stripping cavity 211, a lower mold plate 22, a lower mold cavity 23, an injection molding sub-runner 24, a first stripping hole 241, a stripping groove 242, a first exhaust groove 25, a second stripping hole 251, a glue overflow cavity 26, a second exhaust groove 27, a longitudinal channel 28, a transverse channel 29, a vacuum joint 291, an ejector plate 30, a first ejector pin 31, a second ejector pin 32, a second spring 33 and a push block 34.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 1 to 3.

The embodiment of the utility model discloses precision injection mold of optical lens piece, include from last panel 10 that sets gradually down, cope match-plate pattern 11, lower bolster 22, lower die holder 21 and bottom plate 20, be equipped with stripper chamber 211 in the lower die holder 21, the bottom of panel 10 is fixed with the stand 12 that runs through cope match-plate pattern 11, be equipped with injection molding sprue 121 in the stand 12, cope match-plate pattern 11 has pre-compaction lift chamber 13, sliding connection has pre-pressure plate 14 in pre-compaction lift chamber 13, be equipped with lift abdicating hole 141 in pre-pressure plate 14, stand 12 sliding connection is in lift abdicating hole 141, the bottom of pre-pressure plate 14 is equipped with n upper die lug 15, n is the integer that is greater than 1, be connected with first spring 16 between pre-pressure plate 14 and the pre-compaction lift chamber 13, can effectively control the position of pre-pressure plate 14 through first spring 16, ensure to realize that the pre-;

the lower die plate 22 is provided with n lower die cavities 23 respectively positioned under the upper die bumps 15, an injection molding sub-runner 24 is connected between the lower die cavities 23, the injection molding sub-runner 24 is positioned under the injection molding main runner 121, during die assembly, the injection molding main runner 121 is connected with the injection molding sub-runner 24, the injection molding sub-runner 24 is positioned at the top of the upper die plate 11, the bottom of the injection molding sub-runner 24 is connected with a first stripping hole 241 penetrating to a stripping cavity 211, one side of each lower die cavity 23, which is far away from the injection molding sub-runner 24, is sequentially connected with a first exhaust groove 25, a glue overflow cavity 26 and a second exhaust groove 27 which are positioned at the top of the lower die plate 22, namely the first exhaust groove 25 and the second exhaust groove 27 are respectively connected to two sides of the glue overflow cavity 26, the second exhaust groove 27 is positioned in the lower die plate 22, the second exhaust groove 27 does not penetrate through the side wall of the lower die plate 22, and the bottom, the bottom of each longitudinal channel 28 is connected with a transverse channel 29, the transverse channel 29 penetrates through the side wall of the lower die plate 22, one end, away from the lower die cavity 23, of each transverse channel 29 is connected with a vacuum joint 291, the vacuum joint 291 is connected with a vacuum generator, preferably, the first exhaust groove 25 is of an inverted V-shaped structure with an upward-protruding center, even if molten plastic reaches the first exhaust groove 25, the molten plastic can flow to the lower die cavity 23 and the glue overflow cavity 26 on two sides, and the situation that the molten plastic blocks the first exhaust groove 25 to affect exhaust can be effectively avoided;

an ejector plate 30 is connected in the stripping cavity 211 in a sliding manner, a first ejector pin 31 is fixed on the ejector plate 30, and the first ejector pin 31 is connected in the first stripping hole 241 in a sliding manner.

When the device is applied, under the condition of no other external force, the prepressing plate 14 protrudes out of the lower part of the upper template 11 under the action of the first spring 16, and then, the pre-mold is firstly performed, as shown in fig. 1, the prepressing plate 14 is attached to the upper surface of the lower template 22, the lower mold cavity 23 and the upper mold bump 15 form an injection mold cavity, the lower mold cavity 23, the prepressing plate 14, the injection molding sub-runner 24, the first exhaust groove 25, the flash cavity 26, the second exhaust groove 27, the longitudinal channel 28 and the transverse channel 29 form a closed space, at the moment, the vacuum generator performs vacuum pumping on the closed space through the vacuum joint 291, so that the gas in the closed space can be effectively removed, and the defects that the injection molding body forms a gas hole and the like due to the gas in the injection mold cavity; during injection molding, molten plastic enters the injection molding cavity from the injection molding main runner 121 through the injection molding sub-runner 24; after sufficient molten plastic is injected, complete mold assembly is carried out, as shown in fig. 2, the upper mold plate 11 continuously descends, the distance between the prepressing plate 14 and the top of the prepressing lifting cavity 13 is continuously reduced, the first spring 16 is continuously compressed, the upright post 12 is abutted against the upper surface of the upper mold plate 11, redundant molten plastic protruding in the injection molding sub-runner 24 can be effectively extruded, and the gas of the molten plastic in the injection molding cavity can be effectively extruded by matching with the vacuum pumping work of a vacuum generator, so that the precision and the defect-free inside of the finally obtained injection molding body are ensured. After moulding plastics, vacuum generator continues the in-process of evacuation, because overflow gluey chamber 26 and can effectively hold the unnecessary plastic that overflows from first exhaust groove 25, can effectively avoid melting plastic to get into second exhaust groove 27, indulge passageway 28 and cross channel 29 and take place to block up, can effectively ensure evacuation exhaust effect, can effectively avoid vacuum generator to be damaged simultaneously. When the mold is opened and the material is taken off, as shown in fig. 3, the ejector plate 30 drives the first ejector pin 31 to ascend to eject the injection molding piece, and the first ejector pin 31 is not in contact with the product piece in the injection molding cavity, so that the surface of the product piece can be effectively ensured to be smooth and complete, and the method is suitable for molding and manufacturing of optical lenses.

In this embodiment, a guide hole 131 connected to the top of the pre-pressing lifting chamber 13 is further provided in the upper plate 11, a guide post 17 is fixed to the top of the pre-pressing plate 14, the guide post 17 is slidably connected to the guide hole 131, and the stability of the lifting movement of the pre-pressing plate 14 can be effectively improved by the guide post 17 matching with the guide hole 131.

In this embodiment, a material-removing groove 242 is connected between the injection molding runner 24 and the first material-removing hole 241, when injection molding is performed, the top surface of the first ejector pin 31 is flush with the bottom surface of the material-removing groove 242, molten plastic can be contained in the material-removing groove 242, a material-removing plastic block can be formed after cooling, and the first ejector pin 31 acts on the bottom of the material-removing plastic block, so that the stability of the ejection action formed on the whole plastic part can be effectively improved.

In this embodiment, the vertical channel 28 and the horizontal channel 29 are connected to form a V-shaped channel structure, that is, the horizontal channel 29 is disposed obliquely, and the vacuum joint 291 is connected to the top end of the horizontal channel 29, so that even if the glue overflow cavity 26 overflows in a failure condition, the molten plastic can be effectively prevented from flowing from the horizontal channel 29 to the vacuum joint 291, and the vacuum generator can be effectively prevented from being damaged.

In this embodiment, the bottom of each first exhaust groove 25 is connected with a second stripping hole 251, n second ejector pins 32 are fixed on the ejector plate 30, preferably, the top structure of the second ejector pins 32 matches with the groove bottom structure of the first exhaust groove 25, that is, the second ejector pins 32 can form an inverted V-shaped structure with the groove bottom of the first exhaust groove 25 during mold closing, each second ejector pin 32 is respectively and slidably connected to each second stripping hole 251, the first ejector pins 31 are matched with the second ejector pins 32 to effectively ensure stress balance of a plastic part, and abrasion of a product in an injection mold cavity due to inclination is avoided.

In this embodiment, a second spring 33 is connected between the top of the ejector plate 30 and the lower die plate 22, and the stability of the ejection and stripping actions can be effectively improved through the second spring 33.

In this embodiment, the bottom plate 20 is provided with the ejecting abdicating hole 201, the bottom of the ejector plate 30 is fixed with the pushing block 34, and the pushing block 34 is slidably connected to the ejecting abdicating hole 201, so that the ejector plate 30 can be effectively prevented from deviating in the lifting process.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A precision injection mold for an optical lens, comprising a panel (10), an upper template (11), a lower template (22), a lower mold base (21) and a bottom plate (20) arranged in sequence from top to bottom, the A stripping cavity (211) is arranged in the lower die base (21), characterized in that a column (12) passing through the upper template (11) is fixed at the bottom of the panel (10), and the column (12) There is an injection main channel (121) in the middle, a pre-pressing lifting cavity (13) is arranged under the upper template (11), and a pre-pressing plate (14) is slidably connected in the pre-pressing lifting cavity (13). A lift-off hole (141) is provided in the pressing plate (14), the upright column (12) is slidably connected to the lift-off hole (141), and n upper molds are arranged on the bottom of the pre-pressing plate (14) a bump (15), where n is an integer greater than 1, and a first spring (16) is connected between the pre-pressing plate (14) and the pre-pressing lifting cavity (13);

The lower mold plate (22) is provided with n lower mold cavities (23) which are respectively located directly under each of the upper mold bumps (15), and injection runners are connected between each of the lower mold cavities (23). (24), the injection runner (24) is located directly below the injection main runner (121), and the bottom of the injection runner (24) is connected with a first stripping hole (241). The side of the lower mold cavity (23) away from the injection runner (24) is sequentially connected with a first exhaust slot (25), a glue overflow cavity (26) and a second exhaust slot (27). The bottom of the second exhaust groove (27) is connected with a longitudinal channel (28), the bottom of each longitudinal channel (28) is connected with a transverse channel (29), and each transverse channel (29) is far away from One end of the lower mold cavity (23) is connected with a vacuum joint (291);

A ejector plate (30) is slidably connected in the stripping chamber (211), a first ejector pin (31) is fixed on the ejector plate (30), and the first ejector pin (31) is slidably connected to the ejector plate (30). in the first stripping hole (241).

2 . The precision injection mold for optical lenses according to claim 1 , wherein the upper template ( 11 ) is further provided with a guide hole ( 131 ) connected to the top of the pre-pressing lifting cavity ( 13 ). 3 . ), a guide post (17) is fixed on the top of the pre-pressing plate (14), and the guide post (17) is slidably connected in the guide hole (131).

3. The precision injection mold for an optical lens according to claim 1, wherein a stripping groove (242) is connected between the injection runner (24) and the first stripping hole (241). ).

4. The precision injection mold for an optical lens according to claim 1, wherein the longitudinal channel (28) and the transverse channel (29) are connected to form a V-shaped channel structure.

5 . The precision injection mold for optical lenses according to claim 1 , wherein the bottom of each of the first exhaust grooves ( 25 ) is connected with a second stripping hole ( 251 ). N second ejector pins (32) are fixed on the ejector plate (30), and each of the second ejector pins (32) is slidably connected to each of the second ejection holes (251).

6 . The precision injection mold for optical lenses according to claim 1 , wherein a second spring ( 33 ) is connected between the top of the ejector plate ( 30 ) and the lower template ( 22 ). 7 . .

7 . The precision injection mold for optical lenses according to claim 1 , wherein the bottom plate ( 20 ) is provided with a top material escape hole ( 201 ), and the bottom of the top material plate ( 30 ) is provided with a hole ( 201 ). A push block (34) is fixed, and the push block (34) is slidably connected in the ejection material leaving hole (201).