FR2532195A1 - Crushing device: double, pneumatic with stripping blades; shearing blades; which are reversible by a direct drive motor in order to crush and granulate plastic and half-finished product. - Google Patents

Abstract

The invention concerns instruments of the crushing or granulating type for plastic material; in view of using or reusing it for extrusion or thermoforming. The invention is characterised by a device, double, pneumatic, stripping, shearing, reversible by a direct drive motor. It comprises six rotor blades 1, four stator blades 2, a rotor 3, two stator uprights 4, two blade supports 5, two support reinforcements 6, a feed hopper 7, an evacuation hopper 10, four pivoting spindles 8 and 12, four locking screws 9 and 13, a calibration grating 11, four pneumatic tubes 14, two blade reinforcements 15.

Description

 Title of invention; grinding device: double, pneumatic with devastating blades; shearing; reversible by direct drive for plastic crusher and granulator and half pro @ uit.

 Description: this in @ ention relates to a device of blades which grind or granulate toua the plastics and half produced for use or reuse in extrusion; in thermoforming of raw materials, waste and scrap.

 In crushers or granulators known for plastics; the blades and counter blades are straight or oblique, but have a tangenoielle cut over their entire length which causes: violent shocks to the assembly and to the driving part; frequent jams (the material accumulates and wraps around the burp) which causes production to stop.

 The blade device according to the invention is equipped with teeth on the blades of the rotor and of the stator in an eliooidal pitch of ten mm alternating with each other which causes devastation of the material. The blades are inolinated by respective dws slopes but arranged in opposition from the stator to the rotor which causes the shear @ - a soul point tongenciel. The lamos profile is executed on both sides of the stator which gives it reversibility. The same line of stator blades is symmetrically fixed on 10 stater which gives it a double action.

 The direct drive of the rotor by a coupling in straight line gives it resistance and no loss of power.

 The pneumatic part allows a retension in the feed hopper, a rapid ejection of the material in the evacuation hopper and a cooling in the grinding chamber.

 All this device makes it possible to grind or granulate the plastic materials from the most compact to the finest with ease and increased production incomparably without violent shock of the whole and by a lower motive force.

 The rotor blades (1); are made of XC 38 steel; six in number; 25mm wide, 62.5cm high on the top of the.

bare. The length is 200 mm; threaded by 3M12 at 18 mm from the edge for fixing to the rotor; they have an angular section of 33 4 '; an asymmetrical shear slope of 4, in opposition to the stator blades; e taper of the 20 'in the direction of the slope.

 Teeth are formed on an elicoidal pitch of 10 mm, by concave wise milling, with a depth of 0.9 mm, for a milling cutter BI of 30 mm.

 They receive; a heat treatment of carbo nitriding to a depth of 1 mm on all their surfaces, (except the taps); which provides a breaking strength of more than 230KG.

 Resharpening by grinding is provided on the sides of the cutting angle.

 The stator blades (2) are made of four XC38 steel, 200 mm long, 30 mm wide and 100 mm high. They are crossed by three oblons with a width of 13 wm and a length of 20 mm which allow adjustment after sharpening, and fixing by CHC n 12 screws on the stator. Teeth are made identical to the rotor laces with an angular section of 33 40 'and a symmetrical slope of 4 in opposition to the rotor blades.

 The profile is executed on both sides which provides the reversibility of the blade; they receive the same heat treatment as roters blades and are resharpened.

 The stator blade reinforcements (15) are used to consolidate the supply hopper and to maintain the blades on all their lengths, made of XC 38 steel of 15X30X400; they have a slope of 2 on one side.

 The reter (3) is made of XC 38 of 185mm #, 572mm long, arranged in three supports of soft blades at 120; supported at each end by two 90X40X23 bearings; coupled by a spacer; we line the metering part it is driven by a sleeve.

The stator is formed by two symmetrical uprights (4); where the rolling bearings are fixed; two lace supports (5). two support bezels (6) which with their CHC M6 screws allow the adjustment of the stator blades. All stator material is steel
XC 38.

 The two blade supports allow the tabs to be anchored at their ends.

 The feed hopper (7) on the upper part consists of four uprights; it is movable and articulated by two axes (8) and fixed by two screws (9); the uprights are in semi-hard drawn steel.

 The discharge hopper (10) on the lower part consists of four uprights, the two central ones of which serve as support for the calibration grid (1); it is movable and articulated by two axes (12) and fixed by two screws (15); the uprights are drawn 120X20, semi hard steel.

 The calibrating grid (11) is made of 2 mm thick perforated sheet metal, the holes have a point of 8. It is movable and can be replaced by another grid, the holes of which are higher or lower depending on use; its radius is 165 mm inside. it is embedded in the evacuation hopper.

 The pneumatic part (14) consists of four tubes with a length of 410 mm and one of 20 mm outside; drilled by a line of eight holes # 4 they are embedded; two in the feed hopper, two in the stator uprights. The four support tubes connected to an air supply valve.

 This device is designed for the granulation and grinding of plastics and semi-finished products, but it can be applied to other industrial sectors: shredding household waste, shredding of paper, rags, empty packaging, shredding of vegetable waste, shredding of rubber. and derivatives; larger or smaller devices can be created after increasing or decreasing the device proportionally.

Claims (8)

@EVENDICATIONS  1. Device of blades, double, pneumatic, devastating, shearing, reversible, by direct drive taken up associated with a grinder comprising if rotor blades (1), four stator blades (2), of a supply hopper (7), a discharge hopper (10) provided with a calibration grid (ii), a rotor (3), a stator; consisting of two blade supports (5), two blade support reinforcements (6), two blade reinforcements (15), two bearings (16), two stator uprights (4) characterized by a symmetrical arrangement four stator blades (2) which gives it a double action.  2. The blade device according to claim 1, characterized by a pneumatic assistance (14) comprising four tubes 20 drilled with eight holes 4; located two on the feed hopper, and two on the stator uprights. They are connected to an air supply valve. The air propelled in the upper tubes retains the material in the feed hopper and directs it into the grinding chamber while cooling it. The air propelled into the lower tubes ejects the crushed or granulated material through the calibration grid.  3. The blade device according to claim 1, is characterized by teeth located on the rotor blades (1) and the stator blades (2) formed by concave millings with a depth of O, 9mm fig.3, on one step elicoïdal of 10 mm, they alternate between the rotor and the stator, they provide the devastation of the material.  4 * The blade device according to claim d, is characterized by symmetrical slopes of 40 in opposition from the stator to the rotor which intersect at a single tangential point, which provides the shearing.  5. The blade device according to claims 3 and 4, is characterized by the same slope and toothing profile executed on both sides of the stator blades, which provides reversibility.  6. The blade device according to claim 1, is characterized by a direct drive which adapts by a drive sleeve which adapts at the end of the rotor.  7. The blade device according to claims 3, 4, and 5 is characterized by an angular section of 33 4 'on the stator blades and the rotor blades to allow a clean cut of the dobby.  8. The blade device according to claims 3, 4, 5 and 7, is characterized by a draft of 1 20 'on the rotor blades in the scns of the slope of 4- to allow the intersection of the lines on a cutting line .