SU1142214A1 - Device for regeneration of mould and core sand mixtures - Google Patents

Abstract

A DEVICE FOR REGENER1 FORMING AND ROD MIXTURES, containing a hopper, a working body with an elastic shell and a chute for unloading the material, characterized in that, in order to improve the quality of regeneration by combining the operations of rubbing and dedusting, the device is provided with a drawing layer. The working case is installed in the chamber above this lattice: the lower end of the working case is equipped with a telescopic pipe with the possibility of adjusting the gap relative to the air distribution grille, and the air distribution grille openings are made outside the working body. (L

Description

four

yu yu

The invention relates to foundry, in particular to the regeneration of spent molding and core sands, and can be applied to enrich the molding sands.

A device for the regeneration of molding and core mixtures is known, consisting of a cylindrical working chamber, inside which a horizontal shaft with abrasive discs is mounted. The sand is regenerated by grinding the mixture between the abrasive discs and the bottom of the ClX chamber.

However, the performance of the device is insufficient, since the processing is carried out mainly by the periphery of the disk at a limited contact length with the bottom of the working chamber.

Closest to the proposed technical essence and the achieved result is a device comprising a hopper, a working body with an elastic shell and a chute for unloading material.

Regeneration of the mixture is carried out as a result of rubbing an inert film from the grains of sand during transverse compression of an elastic patch under the influence of the working medium.

During the compression of the shell, fixed in the working body, there occurs a relative movement of the grains of sand, which rub against each other with considerable force, and the abrasion of the surface films occurs in the entire volume of the mixture.

However, the regenerated sand leaves the device along with a pulverized fraction consisting of broken films and particles of sand. This reduces the quality of the regenerated sand.

The purpose of the invention is to improve the quality of regeneration by combining the operations of rubbing and securing.

The goal is achieved by the fact that the device containing the loading bunker, the working body with an elastic shell and the chute for unloading the regenerate is equipped with a fluidized bed chamber with an air distribution grille, the lower end of the working body equipped with a telescopic nipple with the possibility of adjusting the gap relative to the air distribution grille and the hole air distribution

the grids are outside the perimeter of the working case.

The drawing shows a device for the regeneration of molding and core mixtures, a general view.

The device consists of a loading hopper 1, under which the working body 2 with elastic sheath 3 is fixed. The body 2 is installed in the chamber

4 boiling layers with adjustable clearance relative to the air distribution grill 5. The clearance is controlled by a telescopic nipple 6.

The discharge is used to unload the material. 7. Dusty air is sucked through the nozzle 8.

Air distribution grille

5 has holes 9 in which caps 10 are inserted to prevent material from entering the holes, with holes 9 in the grill 5 located outside the perimeter of the working body 2.

The device works as follows.

The pre-crushed, sifted and cleaned from metallic inclusions mixture is continuously fed into the hopper 1. When the working medium, such as compressed air, is supplied between the body 2 and the elastic sheath 3, the mixture is compressed, and as a result, inert films are rubbed off from the sand surface. Compression deformation is transmitted through the entire volume of the material particles, as a result of which a good quality rubbing of the sand particles from the inert films in the entire volume is achieved. After rubbing, the treated mixture containing sand and a dust-like fraction enters the fluidized bed chamber 4 on the air distribution grill 5. Moreover, if no air is supplied under the grill 5, the mixture spreads at an angle of repose and spontaneously flows out of the casing 2 and stops. Cone mixture, located at an angle of repose, locks the mixture in the housing 2.

When air is supplied under the grill 5, a fluidized bed is formed above it. Horizontal jets of air flowing out of the caps 10 destroy the natural slope and the material spontaneously begins to flow out of housing 2. In chamber 4, J11422 is dedusted, the regenerated sand is discharged continuously into the chute 7, and the dusty air is removed through pipe 8. The capacity of the device is 5- depends on the gap between the housing 2 and the grate 5, which is regulated by a telescopic nozzle 6. The degree of dedusting of the regenerate depends on the average length of stay of sand particles in the fluidized bed, the trace This is determined by performance. Adjusting the size of the gap using a telescopic nozzle 6, 14. 4 but to get a regenerate of the required quality. It is advisable to adjust the gap when changing the composition of the waste mixture, production or quality requirements of the regenerate. The proposed device may have several working buildings located in one chamber of the fluidized bed. The high quality of the obtained regenerate ensures its use in the mixture up to 75%, the rest is fresh sand.

Claims (1)

DEVICE FOR REGENERATION OF FORMING AND ROD MIXTURES, containing a loading hopper, a working case with an elastic shell and a estrus for unloading material, characterized in that, in order to improve the quality of regeneration by combining operations of rubbing and dust removal, the device is equipped with a fluidized-bed chamber with an air distribution grill, working the housing is mounted in a chamber above this grating; the lower end of the working housing is equipped with a telescopic nozzle with the possibility of adjusting the clearance relative to the air discharge elitelnoy grille and grille openings formed outside the working body. SU, 1142214