DE3126520A1 - Process for sorting injection moulded parts - Google Patents

Abstract

The present invention relates to the sorting of injection moulded parts and can be used in plastics injection moulding machines. Mouldings (5) and sprue (11) are ejected separately from one another and fall through a shaft (6) into a collection vessel. A pivotable flap (7) is provided in the shaft and directs the moulded parts and sprue to different collection vessels (8, 13) corresponding to their position. <IMAGE>

Description

Procedure for sorting injection molded parts

So far, injection molded parts have been sorted by hand or on a conveyor belt with the help of combing devices. Other elaborate l / experienced see the use of vibrators or when the differences in size of molded parts and specifications allow this, from seven before. It is also known to use a gripper to make the sprue in the form and elsewhere than the ejected To put down farm parts.

It is also known (DE-OS 27 28 403), the ejection of the injection molded parts to be carried out with a two-stage ejector. The successive ejection of the sprue and the molded parts serves to separate the molded parts from the sprue.

The invention specified in claim 1 is based on the object in the case of injection molding processes, the ejected parts automatically as required to separate from each other.

With the solution indicated, it is possible that the time interval for the ejection of the different parts taking place in stages is used to make different tracks for the skin movement of the parts. In this way, as in the subclaims characterized, sprue and molded parts are reliably separated from one another; In addition, however, moldings of different Color or different material can be separated from each other, since the number of ejection stages corresponds to the number of each other separate lanes with different collection containers can be enlarged as required.

For this purpose, for example, in the device for performing of the method according to the invention, several flaps can be arranged one behind the other, possibly at right angles to one another. Instead of

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a flap movement can have a different path for the ejected parts can also be reached by a cross-flow of air or by a collecting basket that moves horizontally catches the parts of an Ausuiurf stage.

The invention is explained in more detail with reference to schematic drawings. Show it

1 shows the ejection of the molded parts and FIG. 2 shows the ejection of the sprue.

The two-part injection molding tool 1, 2 is moved apart after the injection molding process. After this cooling phase, the ejector plate 3, which is operated hydraulically, is moved. In the first step, the longer ejector pins k attached to the ejector plate hit the molded parts 5 and push them out of their shape. The molded parts fall down into a shaft 6 and collide with a flap 7, whereby the molded parts are directed into a collecting container 8 (FIG. 1). This falling movement can be accelerated by a brief air flow from a blower nozzle 9.

In a second step of the ejector movement, the shorter ejector pin hits 10 on the sprue 11, whereby this is also ejected. Since at the same time with the second ejector movement, the flap 7, which is on Shaft 6 is fixed pivotably, is brought into another position by a hydraulically operated lever system 12 (Fig. 2), falls the sprue in another collecting container 13. It is also possible to control the movement of the flap by a failure balance or by a Light barrier, with which the complete ejection of the molded parts or the sprue is determined. By a such control or an adjustable time relay, the time interval between the ejection stages can be determined.

With the return movement of the ejector plate or the closing movement of the injection molding tool, the flap is flipped over again, like this that the ejection process described stops again in the next step can be.

It is of course possible to have more than two different parts sorted to collect, for example, different molded parts in one tool can be sprayed at the same time or in different colors Materials are used. By connecting several in series With flaps, the number of lanes for the ejected parts into the collecting container can be increased. One particularly favorable solution results when a second flap is placed across the first. The controlled folding of these flaps results in a defined one Train to four different collection containers. According to the desired sorting, the movement of the ejector plate 3 in Steps are divided and a corresponding number of groups of ejector pins of different lengths are arranged on the ejector plate. Instead of the movement of the ejector plate in successive steps to subdivide, several ejector plates can be provided, each of which is moved to eject a subgroup of parts.

The device is suitable for retrofitting on any injection molding machine to be installed, as well as the control of the movement of the ejector and the flaps.

The principle of sorting parts can also be used with metal die-casting machines can be applied.

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Claims (1)

Ü ^: t "Ü I Ό I 312652Q Friedrich Legrom Hauenstrasse 8 7157 Murrhardt-Fornsbach, June 30, 1981 Claims V / experienced for sorting injection molded parts, in which the Moldings are ejected separately from the sprue, thereby characterized in that the successively ejected parts on separate lanes in different collecting containers be steered and that the time interval between the ejection stages is adjustable. 2. The method according to claim 1, characterized in that molded parts and sprue (5, 11) are collected separately from one another. 3. The method according to claim 2, characterized in that different Molded parts (5) are collected separately from each other « if method according to one of claims 1 to 3, characterized in that that different colored moldings (5) and sprues • (11) are collected separately from each other. 5. Device 2 for carrying out the method according to one of the Claims 1 to k, characterized in that one or more flaps (7) connected in series are provided in the path of the ejected parts, which through their position release the path to the various collecting containers (Θ, 13). 6. Apparatus according to claim 5, characterized in that of two flaps (7) connected in series, the second being arranged at right angles to the first. 7. Apparatus according to claim 5, characterized in that the Movement of the flaps. (7) is controlled by the movement of the ejector plate (3). «Β« W 0 tf θ. Device according to claim 6, characterized in that the Movement of the ejector plate (3) interrupted udrd. 9. Device according to one of claims 5 to 7, characterized in that that the free fall of the ejected parts through a Air flow is accelerated.