CN109454855B

CN109454855B - Axial bidirectional positioning stretching hollow blow molding mold

Info

Publication number: CN109454855B
Application number: CN201811648827.8A
Authority: CN
Inventors: 谢国基; 姜晓平; 胡青春; 卢佳; 梁炎均
Original assignee: GDXL Precise Machinery Co Ltd
Current assignee: GDXL Precise Machinery Co Ltd
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2024-04-02
Anticipated expiration: 2038-12-30
Also published as: CN109454855A

Abstract

The utility model provides an axial bidirectional positioning stretch cavity blow molding mould, is including surrounding into the preceding mould and the back mould of die cavity, the die block that is located the die cavity bottom, be used for installing the die block, be equipped with the through-hole on the die block, install the supporting rod that can do telescopic motion in the through-hole, the supporting rod can stretch into the middle part of die cavity under actuating mechanism's effect. The invention can fully stretch the material at the bottom of the bottle blank by the support of the support rod, and can be more uniformly distributed at the bottom of the bottle, thereby obtaining better cooling and shaping. The bottle bottom is fully stretched, so that the internal stress of the bottle bottom can be reduced, the bursting probability is reduced, the weight of the bottom material can be reduced, and the effect of reducing the gram weight is achieved.

Description

Axial bidirectional positioning stretching hollow blow molding mold

Technical Field

The invention relates to the technical field of blow molding container molding, in particular to an axial bidirectional positioning stretching hollow blow molding mold.

Background

In the prior art, in the process of forming a blow-molded container, particularly in the blow-molding method of an injection stretch blow-molding two-step method, the axial stretching of a bottle blank is basically to stretch the bottle blank to the bottom of a mold cavity at one time by contacting the inner bottom of the bottle blank through a stretching rod (round steel bar). And injecting compressed air in the stretching process of the stretching rod, blowing the bottle blank by the compressed air to enable the bottle blank to be clung to the cavity wall of the die, and cooling and shaping to obtain the hollow plastic product. When the bottle blank is stretched to be in contact with the metal at the bottom of the die cavity, the bottom of the bottle blank is cooled relatively fast, and the material with limited stretching space is difficult to stretch sufficiently, so that the material is wasted due to accumulation at the bottom of the container, and the generated stress is concentrated, so that the bottom of the container is easy to crack, and the container is more serious especially on a large-capacity container (more than 5L). In addition, when the vertical stretching size of the bottle blank is larger, the stretching rod is easy to generate unstable speed, insufficient rigidity and easy to generate eccentricity at the bottom of the bottle blank, so that the wall thickness of the blow-molded container is uneven, and the integral strength of the container is affected.

The invention provides an axial bidirectional positioning stretching hollow blow molding method which realizes uniform material distribution and can reduce the weight of bottom materials, the material at the bottom of a bottle blank is fully stretched by the bearing in the middle part, the material is more uniformly distributed at the bottom of the bottle, and better cooling and shaping can be obtained. The bottle bottom is fully stretched, so that the internal stress of the bottle bottom can be reduced, the bursting probability is reduced, the weight of the bottom material can be reduced, and the effect of reducing the gram weight is achieved. However, the existing molding dies on the market cannot realize the above functions, so that improvement is needed for the existing molding dies.

Disclosure of Invention

The invention provides an axial bidirectional positioning stretching hollow blow molding mold capable of realizing middle support and fully stretching bottle blank bottom materials.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides an axial bidirectional positioning stretch cavity blow molding mould, is including surrounding into the preceding mould and the back mould of die cavity, the die block that is located the die cavity bottom, be used for installing the die block, be equipped with the through-hole on the die block, install the supporting rod that can do telescopic motion in the through-hole, the supporting rod can stretch into the middle part of die cavity under actuating mechanism's effect.

In the invention, the through hole is positioned in the middle of the bottom die.

In the invention, the top of the bearing rod is a platform, and the diameter of the platform is larger than that of the through hole.

In the invention, the top of the platform is curved, and the middle of the curved surface is provided with a concave pit inwards.

In the invention, the driving mechanism is a pneumatic cylinder, a hydraulic cylinder or a motor.

In the invention, the driving mechanism is connected with the bottom die through a plurality of connecting rods.

In the invention, the top of the die cavity is provided with an upper clamping opening which is fixedly connected with the front die and the rear die through bolts.

In the invention, a sealing structure is arranged between the through hole and the bearing rod.

In the invention, the bearing rod is internally provided with a cooling structure.

In the present invention, the bottom template is shaped like a "U",

the invention has the advantages that: the bottom die is provided with the through hole, the through hole is internally provided with the supporting rod capable of performing telescopic movement, when the bottle blowing process is performed, the supporting rod extends out of the bottom of the die cavity and supports the center of the bottom of the bottle blank which is stretched and expanded gradually, the position of a supported point at the bottom of the bottle blank slows down the stretching speed or pauses stretching, and the periphery of the supported point is stretched continuously under the action of air pressure and self material inertia, so that the bottom of the bottle blank is preformed into a cone bottom with high supported point and low periphery; after the cone bottom is formed in advance, the bearing rod guides the bottle blank bottom to directly fall on the center of the mold cavity bottom, the bottle blank expands and clings to the inner wall of the mold cavity, and then the bottle blank is cooled to form the blow-molded container. The invention can fully stretch the material at the bottom of the bottle blank by the support of the support rod, and can be more uniformly distributed at the bottom of the bottle, thereby obtaining better cooling and shaping. The bottle bottom is fully stretched, so that the internal stress of the bottle bottom can be reduced, the bursting probability is reduced, the weight of the bottom material can be reduced, and the effect of reducing the gram weight is achieved. Furthermore, the guide of the support rod directly falls on the center position of the bottom of the die cavity, even if the stretching rod speed is unstable and the rigidity of the stretching rod is insufficient, the phenomena of eccentric bottom of the bottle blank and uneven distribution of radial circumferential materials of the bottle blank can not occur, the uniform wall thickness of the blow-molded container is ensured, and the integral strength of the container is enhanced.

Drawings

The invention is further described below with reference to the drawings and embodiments:

fig. 1 is a schematic structural view of the present embodiment;

FIG. 2 is a schematic view of the mounting structure of the drive mechanism;

fig. 3 is a schematic structural view of the bottom mold plate.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.

Referring to fig. 1 to 3, disclosed in this embodiment is an axial bidirectional positioning stretching hollow blow molding mold, comprising a front mold 2 and a rear mold 3 which are surrounded to form a mold cavity 1, a bottom mold 4 positioned at the bottom of the mold cavity 1, a bottom mold plate 5 for installing the bottom mold 4, a first back plate 11 and a second back plate 12 for respectively fixing the front mold 2 and the rear mold 3, wherein an upper clamping opening 14 is arranged at the top of the mold cavity 1, the upper clamping opening 14 is fixedly connected to the front mold 2 and the rear mold 3 through bolts, and a stretching rod stretches into the mold cavity 1 from the upper clamping opening. And cooling water channels which are criss-cross are arranged in the front die 2 and the rear die 3 and are connected with the quick connector.

The bottom die 4 is uniformly provided with a plurality of raised ribs, the raised ribs are converged in the middle of the bottom die 4 and form a raised boss shape, a through hole 6 penetrating through the bottom die 4 is formed in the middle of the boss, a supporting rod 7 capable of performing telescopic motion is arranged in the through hole 6, the supporting rod 7 and the stretching rod are on the same axis, the supporting rod 7 can extend into the middle of the die cavity 1 under the action of a driving mechanism 8, and the driving mechanism 8 is arranged outside the die cavity 1.

As a preferred embodiment, the top of the supporting rod 7 is a platform 9 which cannot puncture the bottom of the bottle blank, the diameter of the platform 9 is larger than that of the through hole 6, the top of the platform is in a curved surface shape, and a concave pit 13 which is concave inwards is arranged in the middle of the curved surface, so that the thickness of the top of the bottle is increased.

Further, the driving mechanism 8 may be a pneumatic cylinder, a hydraulic cylinder or a motor, and is preferably a cylinder when only single bearing is needed, the reaction is rapid, the cost is low, and when multiple reciprocating bearings are needed, a private clothes motor and a transmission mechanism thereof are preferably used, and the reciprocating times and the telescopic amplitude can be controlled through the private clothes motor. In this embodiment, actuating mechanism 8 is connected with die block 4 through many connecting rods 10, die block 5 is similar "U" shape, and connecting rod 10 passes die block 5's vacancy and actuating mechanism 8 connection, and many connecting rods 10 enclose into hollow actuating mechanism installing support, separate actuating mechanism 8 and die block 4 through the actuating mechanism installing support, both make things convenient for actuating mechanism 8's installation, also avoid each other producing the influence, increase of service life.

As a further preference, in order to extend the service life of the support rod 7, the side surface of the support rod 7 is provided with a wear-resistant coating, which is a smoother surface with a low coefficient of friction, due to the frequent high-speed movement of the support rod 7 within the through hole 6.

The foregoing is only a preferred embodiment of the present invention, and all technical solutions for achieving the object of the present invention by substantially the same means are within the scope of the present invention.

Claims

1. Adopt the bottle blowing technology of the stretch cavity blow molding mould of axial bidirectional location, its characterized in that includes a stretch cavity blow molding mould of axial bidirectional location, forming die is including enclosing preceding mould (2) and back mould (3) of becoming die cavity (1), being located die block (4) of die cavity (1) bottom, being used for installing die block (4) die block (5), be equipped with through-hole (6) on die block (4), install telescopic movement's supporting rod (7) in through-hole (6), supporting rod (7) can stretch into the middle part of die cavity (1) under actuating mechanism (8) effect, through-hole (6) are located the middle part of die block (4), its characterized in that: the top of the supporting rod (7) is a platform (9), the diameter of the platform (9) is larger than that of the through hole (6), the top of the platform (9) is in a curved surface shape, and a concave pit (13) which is inwards concave is formed in the middle of the curved surface;

when the bottle blowing process is carried out, the supporting rod (7) extends out from the bottom of the die cavity (1) and supports the center of the bottom of the bottle blank which is stretched and expanded gradually, the stretching of the position of a supported point of the bottom of the bottle blank is stopped, and the periphery of the supported point is continuously stretched under the action of air pressure and self material inertia, so that the bottom of the bottle blank is preformed into a cone bottom with high supported point and low periphery;

after the cone bottom is formed in advance, the bearing rod (7) guides the bottle blank bottom to directly fall on the center of the bottom of the die cavity (1), the bottle blank expands and clings to the inner wall of the die cavity (1), and then the bottle blank is cooled to form the blow-molded container.

2. The bottle blowing process using an axially bi-directional oriented stretch blow-molding die according to claim 1, wherein: the driving mechanism (8) is a pneumatic cylinder, a hydraulic cylinder or a motor.

3. The bottle blowing process using an axially bi-directional oriented stretch blow-molding die according to claim 2, wherein: the driving mechanism (8) is connected with the bottom die (4) through a plurality of connecting rods (10).

4. A bottle blowing process using an axially bi-directional oriented stretch blow-molding die as in claim 3 wherein: the connecting rods (10) enclose a hollow driving mechanism mounting bracket.

5. The bottle blowing process using an axially bi-directional oriented stretch blow-molding die according to claim 1, wherein: the top of the die cavity (1) is provided with an upper clamping opening (14), and the upper clamping opening (14) is fixedly connected to the front die (2) and the rear die (3) through bolts.

6. The bottle blowing process using an axially bi-directional oriented stretch blow-molding die according to claim 1, wherein: the side surface of the supporting rod (7) is provided with a wear-resistant coating.

7. The bottle blowing process using an axially bi-directional oriented stretch blow-molding die according to claim 1, wherein: the bottom template (5) is shaped like a U.