JPS6212573Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an injection molding machine, and in particular to an injection molding machine in which an unused molded product to be molded into the resin introduction part of a mold is conveyed by air using an air nozzle. It is.

Conventionally, in a synthetic resin injection molding machine, when injecting resin into a plurality of mold engraving spaces formed in a mold, the resin injected from a heating cylinder at the tip of an injection unit is transferred to a sprue formed in the mold. Generally, the resin was introduced into the die-carving space through a resin introducing section consisting of a section and a runner section. Therefore,
When molding a molded article, unnecessary molded articles are necessarily molded by the resin introducing section, and when the mold is opened, it is necessary to remove the unnecessary molded articles at the same time as taking out the molded article.

Conventionally, it has been common to use a mechanical clamp to remove the above-mentioned unnecessary molded material, but the mechanical clamp has a complicated structure.
It has the disadvantage of low operational reliability and, in addition, the disadvantage of high cost.

The purpose of this invention was to take into account problems such as operational reliability due to structural limitations of the injection molding machine based on the above-mentioned conventional technology, and to create a mold that forms fins for conveying unnecessary molded products in the resin introduction part of the mold. By forming a carving space and arranging an air nozzle on the side of the dividing surface of the mold, the above-mentioned drawbacks are eliminated, and the undesired molded product can be removed with high operational reliability. The aim is to provide an excellent injection molding machine.

The structure of this invention, which meets the above objectives, is that when molding a molded product, air conveying fins are formed on the unnecessary molded material molded in the resin introducing section to expand the air pressure area, and when the mold is opened, the unnecessary molded material is removed. The gist of this method is to spray an air jet onto the fins to separate the unwanted molded product from the mold and transport it by air.

Next, an embodiment of this invention will be described below based on the drawings.

1 to 5, an upper intermediate plate 3 and a lower intermediate plate 4 are interposed between a movable upper mold 1 and a fixed lower mold 2. As shown in FIGS. A heating cylinder 5 of the injection unit passes through the upper mold 1 and the upper intermediate plate 3, and the nozzle portion 6 at the tip is in contact with the lower intermediate plate 4. A resin introduction section 9 consisting of a runner section 7 and a sprue section 8 is formed in the lower intermediate plate 4, and communicates with a die-scabbing space 10 formed in the lower mold 2. As is particularly clear in FIG. 2, the resin introducing portion 9 includes:
A die-carving space 11 for forming fins is formed so as to communicate the sprue parts 8 with each other.

In addition, 12 is a regulation rod, 13 is an air cylinder for driving the upper intermediate plate 3, and 14 is an ejector pin that can freely move in and out of the die-carving space 10.

During injection molding, an unnecessary molded article 15 is molded by the resin introduction part 9, and a fin 1 is formed in the unnecessary molded article 15 by the fin-forming molding space 11.
6 is formed. As shown in FIG. 4, the unnecessary molded article 15 consists of a runner 15a and a sprue 15b, and the fins 16 are formed in a thin flat plate shape from the runner 15a to the sprue 15b.

Incidentally, numeral 17 is a molded product to be molded within the die-carving space 10.

As shown in FIG. 5, on the side of the dividing plane between the upper intermediate plate 3 and the lower intermediate plate 4,
Air nozzles 18 for conveying the waste moldings are arranged facing in five directions, and on the opposite side of the air nozzles 18, a chute 19 and a receiver 20 are provided below the chute 19. be.

In the above configuration, the injection process is performed in the mold clamped state shown in FIG. 1 to mold the molded product 10, and at the same time, the unnecessary molded product 15 is molded in the resin introduction part 9. Then, the unnecessary molded article 1
5, the fins 16 are formed by the fin-forming die-carving space 11.

Next, as shown in FIG. 2, when opening the mold, first, the upper intermediate plate 3 and the lower intermediate plate 4 separate, and the upper mold 1 and the upper intermediate plate 3 rise as one. , the unnecessary molded product 15 is cut and separated from the molded product 17 in the molding space 10. Further, when the upper mold 1 and the upper intermediate plate 3 rise, the regulating rod 12 lifts the lower intermediate plate 4 upward and separates it from the lower mold 2.

Subsequently, as shown in FIG. 3, when the air cylinder 13 is driven to push down the upper intermediate plate 3, the unnecessary molded material 15 is separated from the tip of the heating cylinder 5 and remains locked on the upper intermediate plate 3. becomes.

After that, as shown in FIG.
When compressed air is ejected from 8 and sprayed onto the fins 16 of the waste molded product 15, the waste molded product 15 is separated from the upper intermediate plate 3 and is transported by the compressed air from the chute 19 to the receiver 20. It is housed within.

Note that the embodiment of this invention is not limited to the pin gate type mold shown in the above embodiment, but may be an ordinary mold shown in FIG. 6 and subsequent figures.

In FIGS. 6 and 7, the upper mold 22 attached to the upper mold plate 21 moves up and down as the upper mold plate 21 moves.
It opens and closes with respect to the lower mold 23. The upper mold 22 is formed with a resin introduction part 26 consisting of a sprue part 24 and a runner part 25, and the resin introduction part 26 is formed in the mold engraving space 2 of the lower mold 23.
It is connected to 7. And, in the upper mold 22,
A die-carving space 28 for forming fins is formed from the sprue section 24 to the runner section 25.

As shown in FIG.
9b, and a thin plate-like fin 30 is formed between these.

Note that 31 is a molded product formed by the die-carving space 27.

Other components are the same as those indicated by the same reference numerals in FIGS. 1 to 5.

In the above configuration, when the injection process is performed and the molded product 31 is molded in the clamped state shown in FIG. 6, at the same time, the unnecessary molded product 29 having fins 30 as shown in FIG. 8 is molded. be done.

Next, as shown in Fig. 7, the mold is opened,
When compressed air is ejected from the air nozzle 18 and sprayed onto the fins 30 of the unused molded article 29, the unused molded article 29 is torn off and separated from the molded article 31, and is transported as it is by the compressed air to the chute 19. It is then housed in the receiver 20.

Incidentally, in the above embodiment, the number of molding spaces 10 and 27 for molding the molded product is illustrated as two, but it goes without saying that the number is not limited to this number.

As described above, according to this invention, an injection molding machine comprising a pair of molds, a mold engraving space formed in the molds, and a resin introduction part formed in one of the molds is provided. , forming a fin-forming die-carving space in the resin introduction part of the mold for forming fins for air conveying the unneeded molded product, and disposing an air nozzle on the side of the dividing surface of the mold; With this configuration, when molding a molded product, air conveying fins are formed on the unnecessary molded product that is incidentally molded in the resin introduction part to increase the wind pressure area, and compressed air from the air nozzle is sprayed onto this fin. By attaching this clamp, it is possible to remove the unwanted molded material from the mold and transport it by air, making it extremely simple in structure compared to conventional mechanical clamps, and dramatically improving operational reliability. It has a positive effect.

Moreover, since the air is blown out from the side of the mold, the working time required to take out the unnecessary molded material is significantly shortened, and the working efficiency is improved.

Furthermore, since air nozzles are cheaper than mechanical clamps, they have the advantage of significantly reducing costs.

[Brief explanation of the drawing]

The figure shows an example of this invention.
The figure is a sectional view of one embodiment, Figures 2 and 3 are explanatory diagrams of operation, Figure 4A is an explanatory diagram of unnecessary molded products, Figure B is a sectional view taken along line 6 is a sectional view of another embodiment, FIG. 7 is an explanatory view of the operation from a different perspective, and FIG. 8 is a perspective view of an unnecessary molded product. 1,22...upper mold, 2,23...lower mold, 5...
Heating tube, 9, 26...Resin introduction part, 10, 27...
... Die engraving space, 11, 28... Die engraving space for fin formation, 15, 29... Unnecessary molding, 16, 30...
Fin, 17, 31... Molded product, 18... Air nozzle.

Claims (1)

[Scope of utility model registration request] A pair of molds 1, 2, 22, 23 that open and close each other
and mold engraving spaces 10 and 27 formed in the mold,
In the injection molding machine, the resin introduction part 9, 26 is formed in one of the molds 4, 22 and communicates between the heating cylinder 5, which comes into contact with the mold, and the mold engraving space. The resin introduction part includes a die-carving space 11 for forming fins 16 and 30 for unnecessary molded articles 15 and 29 that are molded into the resin introduction part during molding of the molded product.
28, and an air nozzle 18 for air conveying the unnecessary molded product is disposed on the side of the dividing surface of the pair of molds.