CN220362921U

CN220362921U - Vacuum pumping structure in die

Info

Publication number: CN220362921U
Application number: CN202320745044.1U
Authority: CN
Inventors: 赵伟; 蒋朝阳; 严贵荣
Original assignee: Dongjiang Yagao Rubber Huizhou Co ltd
Current assignee: Dongjiang Yagao Rubber Huizhou Co ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2024-01-19
Anticipated expiration: 2033-04-04

Abstract

The utility model discloses a vacuum pumping structure in a mold, which comprises the following components: an upper die; a lower die arranged corresponding to the upper die; a cavity arranged on the lower die; the vacuum pumping mechanism is arranged on the lower die and comprises a sealing assembly and a vacuum pumping assembly, the sealing assembly is arranged outside the cavity, and one end of the vacuum pumping assembly is communicated with the cavity. This application is through seal assembly and evacuating assembly's setting, reduces the condition that the bubble phenomenon leads to the quality of shaping product to receive the influence appears in the shaping product effectively to, through the space that has reduced required evacuation, thereby reduced the power of aspiration pump, strengthened the effect of mould evacuation greatly.

Description

Vacuum pumping structure in die

Technical Field

The utility model relates to the technical field of liquid silica gel molds, in particular to a vacuum pumping structure in a mold.

Background

Liquid Silicone Rubber (LSR) is a liquid rubber as opposed to solid high temperature vulcanized silicone rubber. Because of the excellent tearing resistance, rebound resilience, thermal stability, heat resistance, ageing resistance and other characteristics, the liquid silica gel is widely applied to the fields of infant products, medical products, electronic products (keys) and the like.

In the related art, in the process of molding liquid silicone rubber, various liquid silicone rubber raw materials are fully mixed into rubber materials, then the rubber materials are conveyed into an injection molding machine, and then are injected or sprayed into a cavity of a mold by the injection molding machine, and the rubber materials are heated in the cavity and are rapidly vulcanized and molded. In order to reduce the occurrence of air bubbles in the molded product, which affects quality, the mold is evacuated after molding. The existing mode of vacuumizing the die generally adopts an external vacuumizing technology, namely, after the die is locked on a machine table, the die is integrally covered by a vacuum cover outside, and then air is pumped out by an air pump.

However, the existing vacuum-pumping mode of the mold is poor in vacuum-pumping effect due to the large space required for vacuum pumping, and a high-power air pump is required to be used, so that the operation speed is low.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a vacuum pumping structure in a die.

The utility model discloses a vacuum pumping structure in a mold, which comprises the following components:

an upper die;

a lower die arranged corresponding to the upper die;

a cavity arranged on the lower die;

the vacuum pumping mechanism is arranged on the lower die and comprises a sealing assembly and a vacuum pumping assembly, the sealing assembly is arranged outside the cavity, and one end of the vacuum pumping assembly is communicated with the cavity.

Preferably, the sealing assembly comprises a sealing groove and a sealing piece, the sealing groove is formed in the lower die, and the sealing piece is arranged in the sealing groove.

Preferably, the vacuum pumping assembly comprises a suction pipe, a suction runner and an air tap, wherein one end of the suction pipe is communicated with the cavity, the suction runner is communicated with the other end of the suction pipe, and the air tap is connected with one end of the suction runner.

Preferably, the plurality of suction pipes are arranged at intervals along the length direction of the suction flow channel.

Preferably, the seal is a sealing rubber ring.

An in-mold vacuum pumping structure of a mold, further comprising: the groove is formed in the lower die and is communicated with the cavity.

An in-mold vacuum pumping structure of a mold, further comprising: the alignment assemblies are uniformly distributed along the circumferential direction of the lower die.

Preferably, the alignment assembly comprises a positioning protrusion and a positioning recess, and one end of the positioning protrusion is inserted into the positioning recess.

Preferably, the alignment assembly further comprises two bolts, and the two bolts are respectively in threaded connection with one ends of the positioning protrusions and the positioning depressions, which are away from each other.

Preferably, the positioning recess has a slope at an end thereof adjacent to the positioning protrusion.

The beneficial effects of this application lie in: the upper die and the lower die are clamped by the sealing assembly to form a closed space, and then the vacuum-pumping assembly is used for vacuumizing the molded product in the cavity. Therefore, the condition that the quality of the molded product is affected due to the occurrence of the bubble phenomenon of the molded product is effectively reduced, and the required vacuumizing space is reduced, so that the power of the air pump is reduced, and the vacuumizing effect of the mold is greatly enhanced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a perspective view of an in-mold vacuum pumping structure of a mold in an embodiment;

FIG. 2 is an exploded view of an in-mold vacuum pumping arrangement for a mold in accordance with one embodiment;

FIG. 3 is a sectional view for showing the internal structures of the upper and lower molds in the embodiment;

fig. 4 is an enlarged view of a portion a in fig. 3.

In the drawing, 1, an upper die; 2. a lower die; 3. a cavity; 4. a vacuum pumping mechanism; 41. a seal assembly; 411. sealing grooves; 412. a seal; 42. a vacuum pumping assembly; 421. a suction tube; 422. a suction flow path; 423. an air tap; 5. a groove; 6. an alignment assembly; 61. positioning the bulge; 62. positioning the concave; 63. and (5) a bolt.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.

In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the utility model, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:

referring to fig. 1 and 2, fig. 1 is a perspective view of an in-mold vacuuming structure of a mold according to an embodiment, and fig. 2 is an exploded view of an in-mold vacuuming structure of a mold according to an embodiment. The in-mold vacuumizing structure in the embodiment comprises an upper mold 1, a lower mold 2, a cavity 3 and a vacuumizing mechanism 4, wherein the upper mold 1 is positioned above the lower mold 2, and the upper mold 1 and the lower mold 2 are correspondingly arranged. The cavity 3 is arranged on one side of the lower die 2 facing the upper die 1, and the vacuumizing mechanism 4 is arranged in the lower die 2. In practice, a plurality of liquid silicone rubber raw materials are fully mixed into sizing materials, the sizing materials are conveyed into an injection molding machine, the sizing materials sequentially pass through a runner and a cold nozzle and are then injected into a cavity 3 for molding, and then vacuum pumping is performed.

When the mold is vacuumized, the upper mold 1 and the lower mold 2 are closed, and then the sizing material is injected into the cavity 3 for molding, and at the moment, the mold is vacuumized through the vacuumizing mechanism 4.

The vacuumizing mechanism 4 comprises a sealing assembly 41 and a vacuumizing assembly 42, wherein the sealing assembly 41 is arranged outside the cavity 3, so that a closed space is formed between the upper die 1 and the lower die 2 after the upper die 1 and the lower die 2 are clamped. One end of the vacuumizing assembly 42 is communicated with the cavity 3 to vacuumize the molded product in the cavity 3, so that the condition that the quality of the molded product is affected due to the occurrence of a bubble phenomenon of the molded product is reduced.

Referring to fig. 3, fig. 3 is a sectional view for showing the internal structure of the upper die 1 and the lower die 2 in the embodiment. The seal assembly 41 includes a seal groove 411 and a seal 412, the seal groove 411 is opened at one side of the lower die 2 facing the upper die 1, and the seal 412 is disposed in the seal groove 411. In this embodiment, the seal groove 411 is annular, and the length and width of the seal groove 411 are both greater than the length and width of the cavity 3. Seal 412 is a seal ring, and the seal ring is in an interference fit with seal groove 411, and in other embodiments, seal 412 may be made of other elastic materials that can achieve an interference fit with seal groove 411. After the upper die 1 and the lower die 2 are clamped, a sealing space is formed between the upper die 1 and the lower die 2 through the arrangement of the sealing piece 412.

The vacuum suction unit 42 includes a suction pipe 421, a suction runner 422, and a nozzle 423, wherein the suction pipe 421 is vertically disposed along the thickness direction of the lower die 2, and one end of the suction pipe 421 is connected to the cavity 3. The suction runner 422 is connected to one end of the suction pipe 421 far away from the cavity 3, one end of the suction runner 422 penetrates out of the lower die 2, and the air tap 423 is connected to one end of the suction runner 422 penetrating out of the lower die 2. In the present embodiment, the number of the suction pipes 421 is four, and the four suction pipes 421 are disposed at intervals along the length direction of the suction flow channel 422. When the mold is evacuated, the air nozzle 423 is connected to an air extracting device such as an air pump, and the molded product in the cavity 3 is evacuated through the suction duct 422 and the suction pipe 421.

The in-mold vacuumizing structure in the embodiment further comprises a groove 5, wherein the groove 5 is arranged on one side of the lower mold 2, which faces the upper mold 1, and the groove 5 is communicated with the cavity 3. The grooves 5 are formed, so that the formed product can be taken out from the cavity 3 by pulling the formed part in the grooves 5 after the sizing material is formed in the cavity 3.

Referring to fig. 3 and 4, fig. 4 is an enlarged view of a portion a in fig. 3. The vacuum-pumping structure in the die in the embodiment further comprises four groups of alignment assemblies 6, the four groups of alignment assemblies 6 are uniformly distributed along the circumferential direction of the lower die 2, and the alignment assemblies 6 are used for enabling the upper die 1 and the lower die 2 to be aligned rapidly. The alignment assembly 6 includes a positioning protrusion 61, a positioning recess 62, and two bolts 63, the positioning protrusion 61 is disposed in the upper mold 1, and one end of the positioning protrusion 61 extends out of the upper mold 1. The positioning recess 62 is disposed in the lower die 2, and one end of the positioning protrusion 61 extending out of the upper die 1 is disposed in a truncated cone shape. One end of the positioning concave 62, which is close to the positioning convex 61, is provided with an inclined surface, the inclined surface is arranged in a downward inclined manner from the outer side of the positioning concave 62 to the inner side of the positioning concave 62, and one end of the positioning convex 61, which extends out of the upper die 1, is inserted into the positioning concave 62. Two bolts 63 are respectively provided in the upper die 1 and the lower die 2, and the two bolts 63 are respectively screwed to the ends of the positioning projections 61 and the positioning recesses 62 facing away from each other, thereby fixing the positioning projections 61 in the upper die 1 and the positioning recesses 62 in the lower die 2. When the upper die 1 and the lower die 2 are clamped, one end of the positioning protrusion 61 extending out of the upper die 1 gradually moves along the inclined plane of the positioning recess 62 until the upper die 1 and the lower die 2 are completely clamped, so that the upper die 1 and the lower die 2 are rapidly aligned.

In summary, in the in-mold vacuumizing structure of the present application, before vacuumizing the mold, one end of the locating protrusion 61 extending out of the upper mold 1 gradually moves along the inclined plane of the locating recess 62 until the upper mold 1 and the lower mold 2 are completely clamped. After the upper die 1 and the lower die 2 are assembled, a sealed space is formed between the upper die 1 and the lower die 2 through the arrangement of the sealing rubber ring, the air tap 423 is connected through the air extracting equipment, and then the molded product in the cavity 3 is vacuumized through the suction runner 422 and the suction pipe 421. Therefore, the condition that the quality of the molded product is affected due to the occurrence of the bubble phenomenon of the molded product is effectively reduced, and the required vacuumizing space is reduced, so that the power of the air pump is reduced, and the vacuumizing effect of the mold is greatly enhanced.

The foregoing description is only illustrative of the utility model and is not to be construed as limiting the utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims

1. An in-mold vacuum pumping structure of a mold, comprising:

an upper die (1);

a lower die (2) arranged corresponding to the upper die (1);

a cavity (3) arranged on the lower die (2);

the vacuumizing mechanism (4) is arranged on the lower die (2), the vacuumizing mechanism (4) comprises a sealing assembly (41) and a vacuumizing assembly (42), the sealing assembly (41) is arranged outside the die cavity (3), and one end of the vacuumizing assembly (42) is communicated with the die cavity (3).

2. The in-mold vacuumizing structure according to claim 1, wherein the sealing assembly (41) comprises a sealing groove (411) and a sealing element (412), the sealing groove (411) is formed in the lower mold (2), and the sealing element (412) is arranged in the sealing groove (411).

3. The in-mold vacuum-pumping structure according to claim 2, wherein the vacuum-pumping assembly (42) comprises a suction pipe (421), a suction runner (422) and an air tap (423), one end of the suction pipe (421) is communicated with the cavity (3), the suction runner (422) is communicated with the other end of the suction pipe (421), and the air tap (423) is connected with one end of the suction runner (422).

4. A structure for evacuating a mold according to claim 3, wherein said plurality of suction pipes (421) are provided, and said plurality of suction pipes (421) are arranged at intervals along the longitudinal direction of said suction runner (422).

5. The in-mold evacuation structure according to claim 2, wherein the sealing member (412) is a sealing rubber ring.

6. The in-mold vacuum-pumping structure of any of claims 1-5, further comprising: the groove (5) is formed in the lower die (2), and the groove (5) is communicated with the cavity (3).

7. The in-mold vacuum-pumping structure of any of claims 1-5, further comprising: the alignment assemblies (6) are uniformly distributed along the circumferential direction of the lower die (2).

8. The in-mold vacuumizing structure according to claim 7, wherein the alignment assembly (6) comprises a positioning protrusion (61) and a positioning recess (62), and one end of the positioning protrusion (61) is inserted into the positioning recess (62).

9. The in-mold vacuum pumping structure according to claim 8, wherein the alignment assembly (6) further comprises two bolts (63), and the two bolts (63) are respectively screwed to one ends of the positioning protrusion (61) and the positioning recess (62) facing away from each other.

10. The in-mold vacuum-pumping structure according to claim 8, wherein one end of the positioning recess (62) near the positioning projection (61) has a slope.