SU1266641A1 - Arrangement for regeneration of waste moulding sand - Google Patents

Abstract

The invention relates to a foundry industry and is intended to produce regenerated sand mainly from sand and tar sand mixtures. The core of the invention is to increase the yield and improve the quality of regenerated sand. In the chamber I of the device through the loading opening 4 serves the spent mixture. Under the action of vibration, the mixture is transferred from the shelf 7 to the lattice 8, and during the movement along it, the large pieces of the mixture are destroyed under the combined action of heat and vibration, while the undisturbed pieces are removed through the hole 5 and the screen part falls on the partition 9. At the descent from the partition 9, the mixture is blown by a stream of suction air, and under it (L by the action of the fraction of the mixture are captured and deposited on the inclined shelves 12, the dust is sucked through the nozzle 6. The inclined shelves are filled with slots and are characterized by the fact that elations distance between the slits in the slits width sostavlyet

Description

The invention relates to foundry production and is intended to produce regenerated sand mainly from sandy-resin waste mixtures.

The aim of the invention is to increase the yield and improve the quality of regenerated sand,

Fig, 1 shows the proposed device, a general view; Fig, 2 is the same, a longitudinal section.

The device comprises a chamber 1 mounted on shock absorbers 2 and equipped with vibrators 3, with a loading opening 4 in the upper part of the chamber 1, a discharge opening 5 for taking out coarse material and a branch pipe, 6 for removing dust-laden gases.

Inside the chamber 1, under the loading opening 4, a receiving shelf 7 is installed, below is an inclined metal grill 8 with a hole size of 2.5-5.0 mm, under which the partition wall 9 is located.

Above the free area of the grid 8, not covered by the receiving shelf 7, the heating element 10 is installed

The discharge opening 5 for the withdrawal of coarse material is located at the lower edge of the grill 8.

Between the bottom 11, installed in the lower part of the chamber 1, and the partition 9, there are several rows of shelf 12 in which slots are made. The ratio of the distance between the slits to their width b is (3050) :.

Partition 9, shelves 12 and the bottom 11 are parallel to each other and at an angle of 10-30 to the horizontal plane.

The discharge opening 3 is filled over the entire height of the chamber 1 between the partition 9 and the bottom 11 and is located opposite to the nozzle 6.

The device works as follows.

The spent mixture through the charging opening 4 enters the receiving shelf 7, the purpose of which is to protect the grid 8 from shock loads. Under the action of the vibration and, connected by the chamber 1 by the vibrators 3, the mixture is removed from the shelf 7 to the grid 8 and advances along it to the opening 5. At the same time, large pieces of the mixture under the action of heat emitted by the heating element 10

destroyed by loss of moisture and burnout of organic binders. Unbroken pieces larger than the lattice cells 8, i.e. 2.55.0 mm is removed from chamber 1 through aperture 5a and the mixture, sifted through four-i cut grating 8, falls onto the partition 9, which is poured under the action of vibration to the discharge

hole 13. When the end of the partition 9 is reached, the mixture begins to fall downward and at this time is blown by a stream of air sucked through the pipe 6. Fine-dispersed fractions

the mixtures are captured by the air flow and carried to the nozzle 6, and particles close in size to the boundary grain are deposited on the shelves 12, the further the smaller the particle. Settled

on the shelves 12, the particles move to the discharge opening 13 under the action of vibration.

The optimal size of the holes of the grid 8 is 2.5-5.0 mm. The lower-NII limit is chosen based on GOST 2138-79 Molding sands, according to which the upper limit for sand is 2.5 mm. The upper limit is taken to be equal to 5 mm, since more large inclusions contained in regenerated sand can negatively affect the surface quality of the castings.

Optimal distance ratio

between the transverse slits L to their width L is (30-50) :. When this ratio is reduced, the slots are positioned very often, which will lead to a mechanical weakening of the shelves 12 operating under alternating loads. Increasing this ratio of the number of slots will not be enough for high-quality cleaning of the material and for

ensuring the required performance of the device, or the length of the shelves 12 and, consequently, the dimensions of the device, will increase. In this case, the width of the slots should be in the range of 5-10 mm. When the width of the slot is reduced, it is possible for the slots to become blocked, since material 12 mm in size is fed to the shelves 12 from under the grill 8, and as the width of the slot increases, the cleaning process deteriorates as the material moves with a dense mass.

The limits of the angle of inclination of the partition 9, shelves 12 and bottom P, installed

Claims (1)

Claim A device for the regeneration of spent molding mixtures, comprising a chamber with vibrators, a bottom, loading and unloading openings and a pipe for removing dusty air, a metal grill and inclined shelves with slots fixed inside the chamber, characterized in that, in order to improve the quality of the regenerated sand , the chamber is equipped with a partition located between the metal grill and the inclined shelves, the discharge hole in the side wall of the chamber is made over the entire height ortsov metal lattice and inclined shelves, wherein the ratio of the distance between the slits inclined shelves to the width of the slots (30-50): 1. • Compiled by Y. Yakovlev