SU1694407A1 - Meter-feeding masticator for thermoreactive materials - Google Patents

Abstract

The invention relates to the processing of plastics, in particular to devices for pre-kneading and accurate dosing of thermosetting materials. The purpose of the invention is to increase reliability in operation by increasing the effort to cut doses and ensure accurate selection of the position of the metering cylinders. For this, the plasticizer-dispenser is equipped with a material cylinder 1 with a hopper 3, a two-position swivel bracket 7 with metering cylinders 8 placed in it and plungers 9, an auxiliary mechanism for cutting doses, made in the form of a lever connected to the stem of the auxiliary cylinder, as well as adjusting stops installed in the zone of interaction between the lever and the swivel bracket 7.1 g. item f-ly, 2 ill.

Description

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The invention relates to the processing of plastics, and in particular to devices for pre-kneading and accurate dosing of thermosetting materials.

The purpose of the invention is to increase the reliability of operation by increasing the effort of cutting doses and ensuring accurate selection of the position of the metering cylinders.

FIG. 1 shows a plasticizer-dispenser; in fig. 2 is a section A-A in FIG. one.

The plasticizer-dispenser contains a material cylinder 1 with a stationary axially fixed screw 2, a hopper 3, a coolant 4 circulating through the channels of the material cylinder 1, a screw rotation drive containing engine 5 and gearbox 6, a two-position rotatable bracket 7 with dispensing cylinders 8 and plungers 9 disposed therein, a mechanism for rotating the dispensing cylinders, made in the form of a gear 10 rigidly connected with a swivel bracket 7, connected by a rack and pinion with a cylinder 11, rotated one auxiliary mechanism for dose cutting, made in the form of a lever 12 connected to the rod of the auxiliary cylinder 13, adjusting stops 14 installed in the interaction zone of the lever 12 and the swing arm 7, counter-pressure cylinders 15 and 16 extrusion,

The operation of the plasticizer-dispenser is carried out as follows.

The powdered or granular reactoplast is poured into the hopper 3, then, entrained by the turns of the rotating auger 2, is transported to the output of the material cylinder 1, heated by the internal friction in the material and the heat transferred to the material cylinder by heat carrier 4,

The heated material is injected into the receiving chamber of the metering cylinder 8 and, overcoming the force of the backpressure cylinder 15, moves the plunger 9 to a predetermined position, for example, until a limit switch (not shown) operates.

At the command of this switch, the rotation of the screw 2 is stopped and the pressure in the cylinder 15 of the counterpressure decreases. The joint efforts of the auxiliary cylinders 13 and 11 and turning, respectively, cut the dose, and further movement of the swing arm

7 is produced only by a turning cylinder 11 until the receiving chamber of the second dosing cylinder 8 is aligned with the loading cavity of the material cylinder 1,

Then the screw 2 is turned on and the material of the receiving chamber of the second metering cylinder 8 is filled with material. At the same time, the already dented dose is removed by the stroke of the ejection cylinder 16.

At the end of the dose set and turning off the screw 2 cylinders 13 and 11 auxiliary and turning, respectively

reverse movement of the swivel bracket 7 in the opposite direction until the receiving chamber of the first metering cylinder 8 coincides with the loading cavity of the material cylinder 1 and the cycle

repeats again.

The combined use of an auxiliary mechanism for dose cutting and a rotation mechanism makes it possible, while maintaining the overall energy balance, to apply more

powerful drive to cut the dose, and further movement of the swivel bracket to produce a slight effort, thereby achieving greater reliability of the plasticizer.

Claims (1)

1. Plastic dosing for thermosetting materials containing material cylinder with feed hopper, a rotary screw, a two-position swivel bracket with metering cylinders and plungers, a backpressure cylinder and a swivel cylinder with a rotary cylinder, the fact that, in order to increase reliability in operation by increasing the effort to cut doses, the kneader-kneader is equipped with an auxiliary mechanism for cutting doses, installed with the possibility of interaction with swivel arm at dose registration. 2, the plasticizer-dispenser according to claim 1, 1, which is different from the fact that, in order to ensure precise selection of the position of the metering cylinders, the plasticizer dosing unit is equipped with adjusting stops located in the zone of interaction of the swing arm with the auxiliary mechanism for cut doses. 2