SU1119727A1 - Rotor mincer for plastic articles - Google Patents

Abstract

1. ROTARY CUTTER OF PLASTIC PRODUCTS, comprising a housing, a hopper, a knife rotor with knives, the working part of which is made saw-tooth with a tooth in the form of an isosceles triangle with an apex of 30 ° -90 °, characterized by in order to reduce the dimensions of the shredder and knife rotor during grinding of large-sized products, as well as to ensure the possibility of unification of knife rotors of shredders of various sizes, it is equipped with additional knife rotors, each rotor made of a cut mounted on a common horizontal shaft, and a frame is mounted above the knife rotors in the horizontal guides with the possibility of reciprocating in the direction perpendicular to the axis of rotation of the knife rotors. I 2. Grinder of 1. characterized in that (L that, in order to adjust the width of the frame, one of its walls is made movable.

Description

The invention relates to devices for the processing of thermoplastic materials, in particular for the grinding of discarded (technological waste) and used plastic products into secondary granular and powdered regenerate.

A rotary chopper of polymeric materials is known, comprising a chamber housing horizontally mounted on a bed, a material grinding unit, to the upper and lower parts of which are attached a bunker and a calibrating grid connected to the ventilation system, plate knives mounted on the walls inside the housing and a rotating prismatic rotor with plate knives mounted on the longitudinal edges of the lateral edges of the rotor 1.

Such a design embodiment of the shredder allows the recycling of waste plastics in the form of mono / 1 pieces, having the possibility of getting between the fixed and movable blades. If the pieces of plastic have large dimensions and do not fall between the fixed and movable knives, the grinding efficiency drops sharply, since the cutting of the cutting edge of the movable blade of the plate into the body of the material to be ground is difficult.

The closest to the invention to the technical essence is a rotary chopper, comprising a housing, a hopper, a knife rotor with knives, the working part of which is made saw-tooth with a tooth in the form of an isosceles triangle with an apex angle from 30 ° to 90 °. In a grinder, the incision of the working part of the movable knife, made saw-tooth with a tooth in the form of a triangle, into the body of the crushed material is much easier, and therefore its productivity increases 2.

However, both of these shredders have a common drawback, namely that their active working area of the shredding chamber is directly proportional to the diameter and working length of the knife rotor. Therefore, when processing large-sized plastic products, it is necessary to dramatically increase these rotor parameters.

If an increase in the length of the knife rotor to 1000 mm and more does not cause any particular difficulties, then an increase in the diameter of the rotor to such dimensions is associated with great technical difficulties and is economically a little justified, since the cost of both the knife rotor and the chopper itself increases dramatically. generally. In addition, difficulties are increasing when installing movable knives with respect to the fixed ones (exhibition of working gap).

and also at repair of the equipment. - It is impossible to unify knife rotors of different sizes, grinders and perform them, for example, from a set of identical

from the unified gear mills.

The purpose of the invention is to reduce the dimensions of the shredder and its knife rotor during grinding of large-sized plastic products, as well as to ensure the possibility of unification of the rotors of shredders of various sizes.

The goal is achieved by the fact that a rotary chopper of plastic products, comprising a housing, a feed hopper, a knife rotor with knives, a working part

5 of which is made sawtooth with a tooth in the form of an isosceles triangle with an apex angle of 30 ° -90 °, provided with additional knife rotors, each rotor made of cutters mounted on a common horizontal shaft, and

The frame is mounted above the knife rotors in horizontal guides with the possibility of reciprocating movement in the direction perpendicular to the axis of rotation of the knife rotors, and one of the frame walls is movable.

FIG. 1 shows the proposed shredder, longitudinal section; in fig. 2 - the same, cross section; in fig. 3 - the same, top view; in fig. 4 - knife rotor, cross section; in fig. 5 - sawtooth working part of movable knives, longitudinal section.

The rotary chopper of plastic products comprises a housing 1, knife rotors, 2 installed in a horizontal row, frame 3, a bunker 4, a headstock 5 of the rotor drive shafts, a tailstock 6, a crank group 7 with a drive 8, a connecting rod 9, a drive W of knife rotors . The housing 1 has DON 11 and a window 12. The knife rotor 2 is assembled from cutters 13 with knives 14 fitted onto the shaft 15. Frame 3 includes a movable wall 16, a finger 17 and guides 18. The headstock 5 of the rotors includes box 19, drive spindles 20 (by the number of rotors) with gear wheels 21, intermediate gear wheels 22, primary gear shaft 23, one of which is connected to pulley 24. Rear headstock 6 includes box 25 supporting shaft

50 26, fork fork 27 and screw 28, interacting with the threaded console fork fork. Crank group 7 includes a gearbox 29, on the end of the output shaft of which a faceplate 30 is fixed with a spike 31 installed on it with the possibility of adjusting its working position on the faceplate radius. The milled article 32 is mounted on the knife rotors from above.

Rotary chopper products made of plastic works as follows.

When the drive 10 is turned on, the knife rotors 2, installed in a horizontal row in an amount sufficient to cover one of the transverse dimensions of the comminuted product 32, receive a rotational motion. When the drive 8 is turned on, a frame 3 receives a reciprocating motion, the stroke of which slightly exceeds the sum of the gaps composed of the gap between two adjacent circumference of the knife rotors 2 and the gap between the workpiece and the adjustable internal gap of the frame 3.

Thereafter, the large-sized plastic article 32 is lowered through the hopper 4 with its lower side onto the rotating knife rotors 2 into the cavity of the frame 3, where

it is crushed at the points of contact with the rotors 2. As it is crushed under the action of its own weight and pressure drop between the cavity of the hopper 4 and the pan 11, from which air with grinding products is continuously sucked, the product

32 goes down. As a result of the reciprocating movement of the frame 3, the passage of the untreated portions of the crushed product through the inter-rotor gaps is prevented.

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Claims (2)

1. ROTARY GRINDER OF PLASTIC PRODUCTS, comprising a housing, a loading hopper, a knife rotor 'with knives, the working part of which is made on a sawtooth with a tooth in the form of an isosceles triangle with an angle at the apex of 30 ° -90 °, characterized in that, in order to reduce dimensions of the grinder and knife rotor when grinding large-sized products, as well as providing the possibility of unification of knife rotors of grinders of various sizes, it is equipped with additional knife rotors, each rotor made of mills ennyh the general horizontal shaft, and over the knife rotors is mounted in the horizontal guide frame with the possibility of reciprocating movement in a direction perpendicular to the axes of rotation of the knife rotors. 2. The chopper according to 1. characterized in that, in order to adjust the width of the frame, one of its walls is made mobile. FIG. 7