SU959895A1 - Apparatus for regeneration of moulding and core mixtures - Google Patents

Description

(54) DEVICE FOR THE REGENERATION OF FORMING AND STEM MIXTURES

The invention relates to foundry production, specifically to installations for. regeneration of sands from waste molding and core sands.

A known method of cleaning granular materials and a device for its implementation, made in the form of a polygonal drum, inside which a pipe with holes for fixing the compressed air 1 is fixedly fixed.

As the drum rotates, the deaths rise in portions upwards and fall onto a stream of compressed air, which throws it onto the walls of the drum and, due to collisions, knocks the binder's binder from the grains of sand.

The disadvantage of such a device is the low productivity during batch feeding of the material and the poor quality of cleaning, which is carried out only at the moment of the impact of the portion of the mixture on the drum walls.

It is also known a device for dry regeneration, comprising a housing inside which a rotor with concave-shaped disks is fixed, and annular screens, regeneration in

which is carried out due to the impact of the particles of the mixture on the obstacle - screens 2.

However, the disadvantage of this device is its low efficiency, since the cleaning process is carried out only at collision, and the free flight time of the particles is much longer than the collision time.

A device for the regeneration of molds and core mixtures is known, consisting of a cylindrical working chamber, inside of which there is a shaft with abrasive disks, a loading device and a drive (3).

Claims (2)

The sand is regenerated by rubbing the mixture between the abrasive disks and the bottom of the working chamber. The cleaning efficiency in this device is quite high, as there is a grinding of the mixtures, which means intensive separation of films from sand particles. However, the productivity of the device is insufficient, since the processing is carried out mainly by periphery of the circle and on a limited circle with the bottom of the working chamber. 3.95 The most essential to the invention by the technical essence and the achieved result is a device containing a base with fixed couples with adjustable compressing force fixed and movable plates with parallel surfaces, a woofer and shock absorbers 4. The lack of a lime device consists in the low quality of regeneration of the molding and core mixtures and low productivity. The purpose of the invention is to improve the quality of the regeneration of molding and core sands and production. The goal is achieved by the fact that the device provides for the regeneration of molding and core mixtures, which contains a base with fixed and compressive forces fixed and movable plates with working surfaces, a vibration drive and shock absorbers, working surfaces of the plates are filled in cross section in aida of projections and cavities , the protrusions of the movable plate are located in the depressions of the fixed plate, and the surface of the movable plate is made of elastic wear-resistant material. In addition, the working surfaces of the plates can be made of polyurethane. FIG. 1 shows the proposed device, a general view; in fig. 2 is a section A-A in FIG. I. Such an embodiment of the device makes it possible to impart the most effective abrasive action on the particles between the plates. Making the working surfaces of the plates in the form of protrusions and valleys increases the relative movement of a part of the material during each oscillation period, which contributes to the intensive rubbing of the grains of sand from the films covering them, hence the quality of the regenerated sand is improved. The optimal shape of the protrusions (depressions) is triangular with an angle when they are between 60 and 120 °, since there is no jamming of the projections, which can be observed at an angle of less than 60 °. In addition, the working length of the slit is increased by 1.5-2 times compared to the rectilinear one, which allows for increased productivity. The use of an elastic material layer, such as polyurethane, as working surfaces helps to reduce wear of the plates due to abrasive abrasion. Initially, when the plates approach each other, a layer of particles is blown into the lining due to the elastic deformation of the latter. With further approaching, the particle plates move already relative to the layer held by the lining. The movable plate 1 is attached in parallel to the fixed plate 2, which is integral with the base 3, via shock absorbers 4. The vibrodrive 5 is fixed to the movable plate 1. The working surfaces of the plates 1 and 2 are filled in the form of projections and depressions, in cross section, for example, triangular in shape, and cover with polyurethane 6. Nut 7 is installed on the axis of the shock absorbers 4 to change their rigidity. In the upper parts of plates 1 and 2 of Bbmoi: gieHbi, chamfers from the side of the working surface, which form an inlet funnel during assembly. The device operates as follows. Pre-crushed, sifted: and cleaned from metallic inclusions, the spent mixture is fed in a continuous stream from above into the hopper over the entire width of the plates 1 and 2. The vibrodrive 5, fixed on the movable plate 1, causes the latter to perform circular or elliptical oscillations in a vertical plane, for each period changing the gap between the plates 1 and 2 from maximum to minimum. With an increase in the gap, when plate 1, moves away from plate 2, the material is transported down under the force of gravity. When the gap is reduced, when plate 1 approaches plate 2, the particles of the mixture force themselves together, thereby cleaning the sand grains from inert films. The pressing force and the gap between them are regulated by changing the stiffness of the shock absorber 4 by moving the nut 7. The industrial application of the proposed device will ensure high-quality sand during the regeneration of sand from spent molding and core mixtures, as it provides the most effective abrasive effect on the particles of relative and relative moving them between elastic surfaces. The technical and economic effect is achieved due to a 2-3 times increase in productivity and wear resistance compared to existing yctaHOBKaivnf. Claims. A device for the regeneration of molding and core mixtures, comprising a base with fixed and movable plates fixed to it with adjustable compression force with working surfaces, an inlet drive shock absorbers, characterized in that, in order to improve the quality of regeneration of the molding and core