CN100467252C - Molds for direct injection and blown plastic hollow container molding products - Google Patents

Abstract

The invention belongs to the technical field of plastic processing, in particular to a mold for directly injecting and blowing plastic hollow container molding products. It includes an injection mold assembly and a blow mold assembly; the injection mold assembly includes a movable mold and a fixed mold arranged in the upper and lower directions, and the opening and closing of the movable mold in the vertical direction with the fixed mold is controlled by a group of driving mechanisms; There is at least one row of injection ports on the movable mold, and at least one row of mandrels with blow ports are fixed on the movable mold, corresponding to the injection ports on the fixed mold; On both sides of the mandrel, at least one row of finished die openings is provided on the inner side of each template, corresponding to each mandrel one by one, and the opening and closing of the two templates in the horizontal direction is controlled by another group of driving mechanisms. By adopting the mold of the invention, it is really realized that both the injection molding parison and the blow molding of the hollow container are completed on the same mold.

Description

Molds for direct injection and blown plastic hollow container molding products

technical field

The invention belongs to the technical field of plastic processing, and specifically relates to a special mold for one-time injection-blow-molding plastic hollow container molding products with a set of molds on an injection molding machine, which is mainly used on ordinary injection molding machines.

Background technique

In the molding process of plastic blow molding products, the traditional process adopts extrusion-blow molding method. The product produced by this method has irremovable protruding cracks on the surface of the product, making the surface of the product unattractive and smooth. And there will inevitably be redundant scraps, resulting in a waste of raw materials and increasing the cost of product molding.

For the above reasons, a two-step injection-blowing method for blow molding blow molded products has been developed. The method is to inject the blow-molded parison first, and then transfer it to the blow molding machine to heat and inflate it into a hollow container product. In this processing method, there are many production links, large equipment investment, complex molding process, and low degree of automation. Recently, in order to overcome the above defects, a new plastic hollow container molding method has been invented, see the Chinese invention patent whose publication number is CN1562610A. It is mainly suitable for two-station horizontal translation molds. This method is that the injection mold is separated from the blow mold, and the injection molded blow parison is transferred to the blow mold outside the injection mold after the injection mold is injection-molded to form a product. This method requires an injection molding machine with a special structure, the production process is difficult to control, the one-time investment is large, and the mold structure is not compact, the neutrality is not good, and the product quality is not easy to guarantee.

Contents of the invention

The object of the present invention is to provide a mold that can complete injection molding and blow molding of plastic products on a common injection molding machine in order to address the shortcomings of the above-mentioned prior art.

In order to achieve the above object, the technical scheme of the present invention is as follows: the mold for directly injecting and blowing plastic hollow container molding products includes an injection mold assembly and a blow mold assembly; the injection mold assembly includes a movable mold and a fixed mold arranged in the up and down direction , the movable mold is controlled by a group of driving mechanisms to open and close in the vertical direction with the fixed mold; the fixed mold is provided with at least one row of injection ports, and the movable mold is fixed with at least one row of mandrels with blow molding ports. The injection openings on the fixed mold correspond one by one; the blow mold assembly includes two templates, which are respectively located on both sides of the above-mentioned mandrel, and the inner side of each template is provided with at least one row of finished die openings, which are aligned with each mandrel. One-to-one correspondence, and the opening and closing of the two templates in the horizontal direction are controlled by another group of driving mechanisms. The mold described in the present invention can be directly installed on an ordinary injection molding machine. After the injection mold completes the injection molding of the blow molding parison, the injection mold is opened, and then the blow molding mold is closed to carry out blow molding.

A vertically movable push plate is arranged above the movable mold, the mandrel runs through the push plate, and the blow mold is supported on the push plate.

An injection-blow molding boss is provided on the above-mentioned push plate corresponding to the penetrating position of the mandrel.

The lower side of the above-mentioned movable mold is connected with the gas plate assembly.

By adopting the mold of the present invention, one set of molds can be used to complete the injection molding of plastic products—blow molding on an ordinary injection molding machine, without adding additional equipment, with small investment, simple operation, high degree of automation and production efficiency, The quality is more guaranteed. Realize that both the injection parison and the blow molding of the hollow container are completed on the same mold. Compared with the prior art, the present invention has the following advantages: 1. The ordinary injection molding machine is directly used, which overcomes the disadvantages of two-step method and two-station method that there are many production process links and large investment in equipment; 2. The degree of production automation and production efficiency are high; 3. The mold structure is compact, easy to install, easy to operate and maintain; 4. It is completed from the parison to the finished product in one step, with good neutrality, no gaps on the product surface, and easier guarantee of product quality.

Description of drawings

Fig. 1 is the flow chart that adopts mold of the present invention to carry out one-step method production;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is a schematic structural view of the positional relationship between the blow mold and the fixed mold mandrel of the present invention;

Fig. 4 is the structural representation of the mold of the present invention after the mold clamping for the first time;

Fig. 5 is the structure schematic diagram after the mold opening of the mold for the first time of the present invention;

Fig. 6 is the structural representation of the mold of the present invention after the second clamping;

Fig. 7 is a schematic structural view of blow molding;

Fig. 8 is a schematic structural view of the first mold opening of the mold of the present invention;

Fig. 9 is a structural schematic diagram reflecting the action state of the push plate in the present invention.

Now in conjunction with accompanying drawing and embodiment the present invention will be further described:

Detailed ways

As shown in Figures 2 and 3, the present invention includes an injection mold assembly and a blow mold assembly. The injection mold assembly includes a movable mold 4 and a fixed mold 5 arranged up and down. The movable mold 4 is controlled by a group of driving mechanisms to open and close vertically with the fixed mold 5 . A row of injection ports 9 is arranged on the fixed mold 5 , and the injection ports communicate with the nozzles 51 on the fixed mold 5 . A row of mandrels 1 with blow molding ports are fixed on the movable mold 4 , corresponding to the injection molding ports 9 on the above-mentioned fixed mold 5 . A vertically movable push plate 8 is arranged above the movable mold 4 for pushing out the finished product. The mandrel 1 runs through the push plate 8 and supports the blow mold assembly 2 on the push plate 8 . The blow mold assembly 2 is composed of two templates 10, which are respectively located on the left and right sides of the mandrel 1 on the movable mold 4, and a group of hydraulic drive mechanisms 3 control the opening and closing of the two in the horizontal direction. A row of finished die openings 101 is provided on the inner side of each template 10 , corresponding to each mandrel 1 one by one. The lower side of the movable mold 4 is connected with the gas plate assembly 41 . An injection-blow molding boss 81 is provided on the upper surface of the push plate 8 corresponding to the penetrating position of the mandrel 1 .

As shown in Figure 1, the processing method includes injection molding and blow molding processing stages. The injection molding stage consists of the following processes: injection molding machine mold closing 11, parison injection molding 12 and mold opening 13; the blow molding stage consists of the following processes: blow mold closing 21, blow molding 22, blow mold opening 24, and premolding Chemicalization 23 and product ejection 25. The specific process is as follows:

As shown in Figure 2, Figure 4 and Figure 5, the injection molding stage includes: the injection mold is closed: the movable mold 4 is pushed from bottom to top to the fixed mold 5, the mandrel 1 is inserted into the injection port 9, and the injection port faces the outer surface of the mandrel Injection molding blank7. After the injection molding is completed, the mold is opened: the movable mold descends and separates from the fixed mold to complete the injection molding.

As shown in Figures 6 to 8, the blow molding stage includes: driven by the hydraulic structure 3, the two templates 10 of the blow molding mold are closed, the finished die openings 101 of the left and right templates are closed, and each mandrel 1 is closed together. Surrounded in the center, air is blown into the mandrel 1 by the air plate assembly, and the blank on its outer surface expands to fill the space surrounded by the left and right die openings 101 to form a molded product 6 . As shown in Fig. 9, after the blow molding is completed, the two templates 10 are separated, and the push plate 8 moves vertically upwards to eject the molded product 6, and then the injection molding machine starts the next injection-blow molding cycle.

If a multi-row multi-cavity mold is used to produce hollow containers, 16 to 32 hollow containers can be produced in one processing cycle, greatly improving production efficiency and greatly reducing production costs.

Adopting the mold of the present invention can overcome the disadvantages of two-step method and two-station method that there are many production process links and large equipment investment. The mold structure is compact, easy to install, easy to operate and maintain, and can be completed in one step from the parison to the product. Well, there is no gap on the surface of the product, the product quality is easier to guarantee, and the degree of automation and production efficiency are greatly improved.

Claims (4)

1, the mould of direct notes, blowing material hollow container shaped article comprises injection mould assembly and blow molding die assembly, it is characterized in that:

The injection mould assembly comprises dynamic model and the cover half that above-below direction is provided with, and dynamic model is by one group of driving mechanisms control itself and cover half folding in vertical direction;

Cover half is provided with at least one row's injection hole, is fixed with the plug that at least one row has the blowing mouth on the dynamic model, and is corresponding one by one with injection hole on the cover half;

The blow molding die assembly comprises two templates, lays respectively at the both sides of above-mentioned plug, and the medial surface of each template is provided with at least one product die orifice of lining up, and is corresponding one by one with each plug, and the folding of two template horizontal directions is organized driving mechanisms control by another;

But be provided with the push pedal that a vertical direction moves above the described dynamic model, plug runs through this push pedal, and supporting blow molding die assembly on the push pedal;

Dynamic model is arranged on the below, and cover half is arranged on the top, and plug up.

2, mould according to claim 1 is characterized in that: the position of running through of corresponding plug is provided with notes-blowing boss above the described push pedal.

3, mould according to claim 1 is characterized in that: the following and gas board component of described dynamic model is connected.

4, mould according to claim 1 is characterized in that: described driving mechanism is a hydraulic drive mechanism.

Images