CN214926996U

CN214926996U - Anti-trapping blow mold

Info

Publication number: CN214926996U
Application number: CN202121071668.7U
Authority: CN
Inventors: 谢文忠
Original assignee: Shanghai Zhenjian Mould Technology Development Co ltd
Current assignee: Shanghai Zhenjian Mould Technology Development Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-11-30
Anticipated expiration: 2031-05-19

Abstract

The utility model relates to a prevent stranded gas blowing mould, it includes the movable mould board that two intervals set up, all fixedly on arbitrary movable mould board is provided with the side mould, and two side moulds are the setting of running from opposite directions, and the blowing mouth has been seted up to the top of two side moulds, and the below of two side moulds is provided with the die block, is formed with the die cavity after the compound die between die block and two side moulds, and the gas vent has been seted up to edge adaptation department in the die cavity. This application can pass through the gas vent discharge with the air between die cavity and the parison in the blow molding process through the gas vent that sets up, prevents that the condition of stranded qi appears in the middle-sized intracavity portion of blow molding process, and this application has the characteristics that prevent stranded qi, improvement shaping quality.

Description

Anti-trapping blow mold

Technical Field

The application relates to the field of blow molding, in particular to an anti-trapping blow mold.

Background

Blow molding is a rapidly developing plastic processing method, wherein one mode is to connect a molded tubular plastic parison to a blow rod, heat the parison and place the parison in a cavity formed by a mold set, immediately extend the parison and the blow rod into a blow port formed on the mold after mold closing, and introduce compressed air into the parison through a blowing device, so that the uncooled parison begins to swell from the axis center of the tubular plastic parison and spreads to the periphery of the cavity, finally clings to the inner wall of the cavity, and is cooled and demolded, thereby obtaining a secondary processing method of a hollow product.

FIG. 1 provides a schematic diagram of a product of a ribbed bottle, wherein a plurality of ribs 10 are arranged in the circumferential direction of the ribbed bottle, and a dog-ear 20 is formed on each of two sides of any rib close to a bottle opening and a bottle bottom, because the exhaust function of an injection mold for molding the product is poor after mold closing, in the blow molding process of the product, air which cannot be exhausted from the inside of a cavity is accumulated at the edge adaptation position of the cavity and causes the process defect of air trapping, the surface of the product with the air trapping defect is uneven after cooling molding, the molding quality is poor, and a part to be improved exists.

SUMMERY OF THE UTILITY MODEL

In order to prevent that the gas trapping defect from influencing the surface quality of products in the forming process of the convex edge bottle, the application provides a gas trapping prevention blow molding die.

The application provides a prevent sleepy gas blow mold adopts following technical scheme:

the utility model provides a prevent stranded gas blowing mould, includes the movable mould board that two intervals set up, arbitrary all fixed side mould that is provided with on the movable mould board, two the side mould is run from opposite directions the setting, two the blowing mouth has been seted up to the top of side mould, two the below of side mould is provided with the die block, behind the compound die the die block with two be formed with the die cavity between the side mould, the gas vent has been seted up to edge adaptation department in the die cavity.

By adopting the technical scheme, the exhaust port arranged at the edge adaptation position of the cavity is utilized, so that gas in the cavity can be favorably exhausted from the exhaust port smoothly, the gas trapping defect of the parison in the forming process is prevented, and the surface quality of a product is improved.

Preferably, two air outlets are arranged on any side die and are respectively positioned at two corners of the edge.

Through adopting above-mentioned technical scheme, when carrying out the blow molding operation, because parison is in the inside bloated order of die cavity for from the center to all around, so lie in two places of dog-ear about the edge and change the defect of trapping gas more and more appear in the forming process, set up the gas vent and can further make the inside gas of die cavity discharge in the gas vent smoothly in two dog-ear of die cavity edge, further prevent that the parison from appearing the defect of trapping gas in the forming process, help improving the surface quality of product.

Preferably, the caliber of any one of the exhaust ports gradually increases along the direction far away from the side die.

Through adopting above-mentioned technical scheme, set up the bore of gas vent for along keeping away from the direction crescent of side mould, can accelerate the exhaust velocity of intracavity gas, be favorable to preventing the emergence of trapping the gas defect.

Preferably, the inner wall of the cavity for forming the side wall of the rib bottle is concave.

Through adopting above-mentioned technical scheme, because in the cooling process after the injection mould of preforming accomplishes the blow molding work, mould the thickness that a expend with heat and contract with cold and can lead to the product lateral wall and reduce, the inner wall design that is used for shaping bead bottle lateral wall in the die cavity can make the product shaping be outside bellied shape in the blow molding process for concave shape, carry out refrigerated in-process material shrink, make the product lateral wall resume level and smooth, be favorable to guaranteeing the pleasing to the eye of product on the one hand, on the other hand is favorable to keeping the shaping thickness of product lateral wall, strengthen the intensity of product lateral wall.

Preferably, one side of the bottom die, which is close to the two side dies, is provided with a clamping block, and two sides of the clamping block are respectively in clamping fit with the two side dies during die assembly.

Through adopting above-mentioned technical scheme, in the blowing mould, the die block is fixed connection usually on the workstation, when carrying out the compound die operation, and two side moulds all can form the joint cooperation with the joint piece, can guarantee on the one hand that the mould leakproofness is good, and on the other hand can play the effect of location to two side moulds that are close to each other, prevents because the condition that appears the body dislocation behind the unable alignment of two side moulds leads to the product shaping.

Preferably, the clamping block is provided with a clamping surface, one side of each side mold close to the bottom mold is provided with an embedded groove corresponding to the shape of the clamping surface, and the clamping surface and the inner walls of the two embedded grooves form clamping fit when the molds are closed.

Through adopting above-mentioned technical scheme, inlay and establish groove and joint face shape and correspond, can guarantee that the two joint is inseparabler when the compound die, specifically realized the joint mode of die block and two side moulds, because the joint face is located the die block and the die block rigidity, can improve whole blow molding die's stability at the blow molding shaping in-process after the compound die simultaneously.

Preferably, any side die is provided with a positioning block along the direction close to or far away from the blowing rod in an elastic sliding manner.

Through adopting above-mentioned technical scheme, the pole of blowing receives gas blowing device's air current impact can take place vibrations and take place slight displacement at the blow molding in-process, leads to the product not good with the coupling part surface quality of the pole of blowing, uses the locating piece to carry out the butt with the pole of blowing spacing to be favorable to improving the stability of the pole of blowing among the blow molding process, prevents that the product from taking place with the not good condition of coupling part surface quality of the pole of blowing.

Preferably, any side die is provided with a limiting groove, the limiting grooves are located on two sides of the blowing rod, the positioning blocks are arranged in the two limiting grooves in a sliding mode respectively, one side, away from the blowing opening, of each positioning block is provided with a spring, and one side, away from the blowing rod, of each spring abuts against the movable die plate on the same side.

Through adopting above-mentioned technical scheme, set up the locating piece in the groove that slides and use the spring as the buffering, can prevent to press from both sides suddenly and lead to the condition emergence of blowing the pole deformation, and the spring can assist the locating piece to support tightly the pole of blowing when the compound die, further strengthens the stability of the pole of blowing in the blow molding process, has also specifically realized the slip mode of locating piece and the butt mode of the pole of blowing and locating piece simultaneously.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the exhaust port penetrating through the edge is beneficial to exhausting gas in the cavity from the exhaust port, so that the process defect of gas trapping in the forming process of the parison is prevented, and the surface quality of a product is improved;

2. by means of the inner wall of the side die with the concave design and the exhaust port with the gradually-opened design, on one hand, the uniformity of the wall thickness of a product can be ensured, on the other hand, the exhaust speed of gas in a cavity can be increased, large bulges are not formed on the surface of the product as much as possible, and the two are both beneficial to improving the attractiveness of the product;

3. bottom die and two side moulds that set up through the joint and be used for two locating pieces of joint gas blow pole help strengthening the stability of product in the blow molding forming process, prevent that the not good condition of product surface quality from taking place.

Drawings

FIG. 1 is a schematic diagram of a prior art ribbed bottle structure;

FIG. 2 is an exploded view of the blow mold according to the embodiment of the present application, which mainly shows the complete structure of the air-tight blow mold;

FIG. 3 is a schematic cross-sectional view of a mold cavity of an air-tight blow mold according to an embodiment of the present invention;

fig. 4 is a partially enlarged view of a portion a in fig. 3, mainly showing the structure of the exhaust port.

Reference numerals: 1. moving the template; 2. a die set; 21. a blow molding port; 22. side molds; 221. embedding a groove; 23. bottom die; 231. a clamping block; 232. a clamping surface; 24. a cavity; 25. an edge; 251. abutting the edge; 252. an exhaust edge; 26. bending the corner; 27. an exhaust port; 28. a limiting groove; 281. a sliding groove; 3. positioning blocks; 31. a sliding block; 32. a spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses prevent trapping gas blow mold.

Referring to fig. 2 and 3, the anti-trapping blow mold comprises two movable mold plates 1 arranged at intervals, wherein both movable mold plates 1 are arranged vertically, and a mould group 2 is arranged between the two movable mould plates 1, a blow molding opening 21 is arranged above the mould group 2, the mould group 2 comprises a bottom mould 23 and two split side moulds 22, any side mould 22 forms a fixed connection with the movable mould plate 1 close to the side mould 22, the bottom mould 23 and the two side moulds 22 are combined to form a forming cavity 24, the forming cavity 24 is arranged in a similar rectangular shape and is provided with four edges 25, two of the edges 25 are abutting edges 251 formed by abutting two side dies 22 after die assembly, the other two edges 25 are exhaust edges 252 existing before die assembly, the four edges 25 are provided with folded angles 26 close to the two sides of the injection molding opening and the bottom die 23, and two folded angles 26 of any exhaust edge 252 penetrate through the side die 22 to be provided with exhaust openings 27.

In practical use, before the blow molding operation, the tubular parison is connected to the blowing rod and heated and softened and then placed into the cavity 24, after the mold is closed, the blowing device injects air into the parison through the blowing rod and makes the parison bulge to finally fill the whole cavity 24, and as the bulging sequence of the parison in the blow molding process is from the center of the axis of the tubular parison to the periphery of the cavity 24, the gas trapping situation is more likely to occur in the internal bevel 26 of the cavity 24 in the molding process, and the gas exhaust port 27 is arranged at the bevel 26 to enable the gas in the cavity 24 to be smoothly exhausted from the gas exhaust port 27, the gas trapping defect of the parison in the molding process is favorably prevented, and the surface quality of a product is favorably improved.

Referring to fig. 2 and 3, the inner wall that arbitrary die cavity 24 is used for shaping bead bottle side is the indent design, and one side that arbitrary side mould 22 is close to die block 23 has all been seted up and has been inlayed and establish groove 221, and one side that die block 23 is close to two side moulds 22 is provided with joint piece 231, is provided with joint face 232 on the joint piece 231, and arbitrary inner wall that inlays and establish groove 221 all corresponds with joint face 232 shape, and when the compound die, joint piece 231 inlays and establishes two in the groove 221 is inlayed and established, joint face 232 and two the inner wall that inlays and establish groove 221 forms the joint cooperation.

Referring to fig. 2 and 3, any side mold 22 above the blow molding opening 21 is provided with two limiting grooves 28, two limiting grooves 28 are oppositely arranged, any limiting groove 28 is provided with a sliding groove 281 along the width direction thereof, any limiting groove 28 is provided with a positioning block 3 in a sliding manner, two sides of any positioning block 3 in the width direction are provided with sliding blocks 31, the two sliding blocks 31 on the positioning block 3 are respectively in an inserting and sliding fit with the two sliding grooves 281 on the side wall of the corresponding limiting groove 28, one side of any positioning block 3 far away from the blowing rod is provided with a spring 32, the number of springs 32 on any positioning block 3 is multiple, in the embodiment of the invention, two springs are provided, one side of any spring 32 near the positioning block 3 is inserted into the positioning block 3 and is not communicated with the positioning block and is in an abutting fit with the positioning block, the other side abuts against the movable mold plate 1 at the same side with the positioning block 3, when the die is closed, the two positioning blocks 3 are in butt fit with the side wall of the blowing rod.

In-service use, side mould 22 forms the leakproofness that the joint cooperation can guarantee the mould with joint piece 231 and is good, blow the pole and the cooperation of locating piece 3 formation butt can increase the stability of blowing the pole in the blow molding in-process, the two all can improve whole blow molding die's stability, be favorable to improving the surface quality after the product shaping, and because the product expend with heat and contract with cold and can lead to the wall thickness of product lateral wall to reduce in the cooling process after the blow molding is accomplished, set up the inner wall that is used for shaping bead bottle lateral wall inside die cavity 24 into the indent and can make the product earlier the shaping be outside bellied shape in the blow molding in-process, carrying out refrigerated in-process material shrink, make the product lateral wall resume level, be favorable to guaranteeing the pleasing to the eye of product on the one hand, on the other hand is favorable to keeping the shaping thickness of product lateral wall, strengthen the intensity of product lateral wall.

Referring to fig. 3 and 4, since the four exhaust ports 27 are different only in installation position and the structure and size parameters of any one of the exhaust ports 27 are the same, one of the exhaust ports 27 will be described as an example.

Referring to fig. 3 and 4, the width of the exhaust port 27 on the side close to the inner wall of the side die 22 is preferably set to 0.01mm to 0.1mm, the length is preferably set to 0.5mm to 2mm, the width is set to 0.04mm and the length is set to 1mm in this embodiment, and the exhaust port 27 is of an involute design, that is, the caliber of the exhaust port 27 gradually increases in the direction away from the side die 22.

By adopting the technical scheme, if the specification of the exhaust port 27 is too small, the exhaust speed is too low, the forming speed is influenced, if the specification of the exhaust port 27 is too large, a product can form a large bulge on the surface after forming, the surface quality and the aesthetic degree of the product can be influenced under the two conditions, so that one side of the exhaust port 27 close to the side die 22 is designed to be 0.04mm multiplied by 1mm, the exhaust speed of gas in the cavity 24 can be accelerated through the exhaust port 27 which is designed to be gradually opened, and the defect of gas trapping caused by unsmooth exhaust can be favorably prevented.

The implementation principle of the anti-trapping blow mold in the embodiment of the application is as follows: before the blow molding operation, the tubular parison is connected to the blowing rod and is heated and softened, the softened tubular parison is placed into the cavity 24 and is combined with the mold, at the moment, compressed air is introduced into the parison through the blowing rod by the blowing device, the parison is expanded and gradually expands to fill the whole cavity 24, along with the expansion of the parison, air between the cavity 24 and the parison is gradually discharged from the exhaust port 27, after the blow molding is finished, because the inner wall of the side mold 22 is in the concave design, the side wall of the product is in the outward convex shape before cooling, then the side wall of the product can gradually recover to be flat along with cooling, and at the moment, the mold is opened to take the part, so that the product with higher surface quality can be obtained.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an air trapping prevention blow mold which characterized in that: including movable mould board (1) that two intervals set up, arbitrary all fixed side mould (22) that are provided with on movable mould board (1), two side mould (22) are to opening the setting, two blow molding mouth (21), two have been seted up to the top of side mould (22) the below of side mould (22) is provided with die block (23), behind the compound die block (23) and two be formed with die cavity (24) between side mould (22), gas vent (27) have been seted up to edge adaptation department in die cavity (24).

2. The air entrapping preventing blow mold according to claim 1, wherein: and two air outlets (27) on any side die (22) are arranged, and the two air outlets (27) are respectively positioned at two break angles (26) of the edge (25).

3. The air entrapping preventing blow mold according to claim 1, wherein: the caliber of any exhaust port (27) is gradually increased along the direction far away from the side die (22).

4. The air entrapping preventing blow mold according to claim 1, wherein: the inner wall of the cavity (24) for forming the side wall of the convex rib bottle is arranged in a concave manner.

5. The air entrapping preventing blow mold according to claim 1, wherein: one side of the bottom die (23) close to the two side dies (22) is provided with a clamping block (231), and two sides of the clamping block (231) are respectively matched with the two side dies (22) in a clamping manner during die assembly.

6. The air entrapping preventing blow mold according to claim 5, wherein: be provided with joint face (232) on joint piece (231), arbitrary side form (22) are close to one side of die block (23) and all seted up with inlay groove (221) that joint face (232) shape corresponds, during the compound die joint face (232) and the inner wall formation joint cooperation of two inlay grooves (221).

7. The air entrapping preventing blow mold according to claim 1, wherein: and a positioning block (3) is arranged on any side die (22) in an elastic sliding manner along the direction close to or far away from the air blowing rod.

8. The air entrapping preventing blow mold of claim 7, wherein: limiting grooves (28) are formed in any side die (22), the limiting grooves (28) are located on two sides of the blowing rod, the positioning blocks (3) are arranged in the two limiting grooves (28) in a sliding mode respectively, a spring (32) is arranged on one side, away from the blowing opening (21), of each positioning block (3), and one side, away from the blowing rod, of each spring (32) is abutted to the movable die plate (1) on the same side.