DE8226068U1 - Loading device on injection molding machines - Google Patents

Description

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Ernst Sauerbruch
7702 Gottmadingen

Loading device on injection molding machines

The invention relates to a charging device on injection molding machines for non-free-flowing molding compounds, in particular Polyester masses, consisting of a piston-cylinder unit, into which the material to be processed through a filling opening introduced and fed to a plasticizing cylinder.

In such injection molding machines, the material to be processed consists of a viscous, doughy mass that is fed into the loading device. The further conveying and introduction of the mass into the plasticizing cylinder is forcibly carried out by a hydraulically driven stuffing piston which is guided in a cylinder. A filling opening in the cylinder casing or a funnel is arranged, through which the material in the retracted Stopfkol- _Ά ben ^ in the cylinder is input auffl * § The filling opening is capping by an externally arranged to the cylinder lid $ bar. I.

To avoid wasting time during the filling process

it is already known to arrange a slide in the filling opening, who can pick up the material to be filled at any time. To empty the slide, it is pulled back when the slide is pulled back The plunger is pulled out of the filling opening in a horizontal direction, whereby the on the slide Material can fall down into the cylinder space. Then the stuffing piston is moved forward again and pressed the material into the plasticizing cylinder.

This known design has the disadvantage that the pasty, sticky molding compound on the slide and in it Sets guideways. The consequence of this is blockages and disturbances in the movement of the slide. Also will also the filling opening or the filling chute is smeared by the molding compound and the molding compound itself has an increased risk of pre-soiling exposed. Especially with light masses, soiled particles can contaminate the finished part lead, which thereby becomes scrap. Frequent cleaning of the loading device, which also leads to time losses, is therefore absolutely necessary.

The invention is based on the object mentioned ax To avoid disadvantages and to create a charging device in which the molding compound with as few parts as possible

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the loading device comes into contact and one Trouble-free workflow guaranteed without loss of time.

According to the invention, this is achieved in that a receiving tray in the filling opening or in a filling shaft is arranged, which can be pivoted about a horizontal axis for emptying the filled material into the cylinder is stored.

According to a further advantageous feature of the invention, the receiving shell is approximately semi-cylindrical, wherein the pivot axis of the receiving shell is arranged approximately coaxially to the longitudinal axis of the half-cylinder.

For pivoting and locking the receiving shell, a hydraulic or is attached to it at a distance from the pivot axis Articulated pneumatic cylinder, the other end of which is rotatably mounted on a boom arm of the loading device is.

For the automatic operation of the loading device is; the hydraulic or pneumatic cylinder for swiveling the receiving tray from the stuffing piston via limit switches in such a way controlled that at the end of the return movement of the stuffing piston

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the receiving tray is swiveled into the emptying position.

For safety reasons, the feed chute and with it also the cradle covered by a flap that driven by a hydraulic or pneumatic cylinder and is controlled such that it is only opened in the rest position of the receiving tray.

The advantages achieved by the invention are in particular that by the semi-cylindrical shape and the Pivotability of the receiving shell encapsulates the filled material relative to the other parts of the loading device and smearing and sticking of moving parts is impossible. A leakage of the molding compound the receiving tray is only possible after swiveling in the emptying position.

In the following description and the drawing, which shows an embodiment, the invention is more detailed explained. Show it:

Pig * 1 shows a cross section through the loading device according to the invention and

Fig. 2 is a plan view of the feed ,. device according to FIG. 1

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The charging device 1 is attached to the side of an injection molding machine not shown in detail. A stuffing piston 2 is guided in a cylinder 3 and driven by a hydraulic cylinder, not shown. Via a connection channel 4 is the cylinder 3 with a plasticizing cylinder 5 connected to the injection molding machine.

A feed chute 6 is arranged above the cylinder 3, through which the mass to be processed is entered into the cylinder space. In the feed chute 6 is a receiving tray 7 pivoted. The receiving shell 7 is semi-cylindrical and has 8 each on its end faces a stub shaft 9, which are rotatably mounted in side walls 10 of the feed chute 6. The pivot axis 11 of the Receiving shell 7 coincides with the longitudinal axis of the half cylinder.

On one of the end faces 8 of the receiving shell 7, an outwardly sealed bolt 12 is fixedly arranged, which is a semicircular elongated hole 13 in the side wall 10 of the feed chute 6 interspersed with play. A pneumatic cylinder 14 is articulated at the free end of the bolt. The other end of the Pneumatic cylinder 14 is on a boom 15 of the loading device 1 rotatably mounted.

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The filling chute 6 is covered by a flap 16 at the top. The flap 16 is on the side walls 10 of the Filling chute 6 pivotably articulated in hinges 17. At the The front end of the flap 16 is engaged by a pneumatic cylinder 18 which, with its other end, is attached to a carrier 19 of the loading device 1 is hinged.

The operation of the invention is as follows. The flap 16 is controlled by the pneumatic cylinder via known program switches 18 pivoted about the hinges 17 and brought into the open position, not shown. The receiving tray 7 is in the position shown in FIG. The material to be processed can now be done manually or automatically through a feed device into the receiving tray 7 can be entered. The flap 16 is then closed again by actuating the pneumatic cylinder 18. in the In the retracted state of the stuffing piston 2, the pneumatic cylinder 14 is operated via limit switches (not shown) set. The receiving shell 7 is pivoted about the pivot axis 11 by about 130 ° into the emptying position, so that the Filled molding compound can fall down into the cylinder space of the cylinder 3 due to its own weight. Through the Subsequent forward movement of the stuffing piston 2 is the molding compound located in the cylinder 3 through the connecting channel 4-

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pressed into the plasticizing cylinder 5 * In the meantime the receiving tray 7 are reloaded because the stuffing piston works independently of the receiving tray 7. When the stuffing piston 2 has reached a minimum level to be determined, the charging process is repeated.

For safety reasons, the pneumatic cylinder for actuating the flap 16 is switched so that the flap can only be opened when the receiving shell is in its rest position according to FIG. 1 and the Pneumati.l «: cylinder 14 is out of order.

Claims (5)

• t t · Ct 82 26 068.0 April 7, 1986 Ernst Sauerbruch New protection claims 1. Feeding device on injection molding machines for non-free-flowing molding compounds, in particular thermosets and polyester compounds, consisting of a piston-cylinder unit into which the material to be processed is fed through a Filling opening is introduced and fed to a plasticizing cylinder, characterized in that in the filling opening or a receiving tray in a feed chute (6) 7. Is arranged to drain the tin filled material is pivotably mounted in the cylinder (3) about a horizontal axis (11). 2. Loading device according to claim 1, characterized in that that the receiving shell (7) is approximately semi-cylindrical and the pivot axis (11) of the The receiving shell (7) is arranged coaxially to the longitudinal axis of the half-cylinder. 3. Loading device according to claim 1 or 2, characterized in that on the receiving shell (7) at a distance a hydraulic or pneumatic cylinder (15) is articulated from the pivot axis (11), the a —2 ·· End on a carrier (19) of the loading device (1) is rotatably mounted. 4 ·. Loading device according to Claim 3i, characterized in that that at the end of the return path of the stuffing piston (2) a cooperating with this, Fixed limit switch is arranged, which is used to! pivot the receiving tray (7) into the emptying position the hydraulic or pneumatic cylinder (14) is connected. 5. Loading device according to one of claims 1 to 4, characterized in that at the upper end of the Filling chute (6) a flap (16) covering the filling chute (6) and the receiving tray (7) is on the sin hydraulic or pneumatic cylinder (18) to open the flap (16) during the rest position the receiving shell (7) is hinged.