SU1126355A1 - Device for preparing used moulding sand - Google Patents

Abstract

INSTALLATION FOR PREPARING spent sand containing a vertically vibrating helical conveyor, vnl1ochayuschy support tube, antivibration mountings, vibrovoz .buditel upper screw channel with sieving holes and openings for blowing cooling air, the lower screw tray promezhuggochnuyu and unloading terminal estrus, boot The upper and lower screw chutes are characterized in that, in order to improve the quality of the mixture and the performance of the installation, it is equipped with a mechanism for crushing the lumps of the mixture, The screw tray is provided with an additional discharge chute located in the upper part of the conveyor and a partition installed behind the g intermediate chute, and the bottom screw tray of the partition wall has a screening hole located above the working surface of the upper screw chute, and the intermediate chute is connected to the loading chute bottom screw tray using the funnels, and the crushing mechanism of lumps of the mixture is installed between them. about 9d 9: n U1

Description

one

The invention relates to foundry, in particular, to the design of devices for processing the spent mixture before re-using it as a component of a molding mixture.

A vertical-helical vibrating conveyor is known, in which, simultaneously with the removal of material, it is sieved, divided into fractions, cooled, dried, and some other operations. Such a conveyor consists of a carrier pipe, vibration dampers, a vibration exciter and two screw trays arranged one above the other with loading and unloading chutes. The conveyor can be used to transport, screen and cool the spent mixture lj.

However, in the case of use for the preparation of waste mixture, the two-way vibration-screw conveyor has a significant drawback, which consists in large output into the dump product, since the material in it is divided only into two fractions and in the design from. There are devices for crushing large clods of processed material. material.

The closest technical

The essence of the invention is an installation for processing ectuchi-, materials, made in the form of a vertical-screw vibration conveyor, including a supporting pipe, vibrating supports, a vibration exciter, an upper screw tray with screening holes and openings for blowing cooling air, a lower screw tray, intermediate and end discharge chutes, boot chutes of the upper and lower trays. This setup permits the screening operation to separate the material into coarse, medium and fine fractions, of which only the small fraction is used in the foundry industry. On the conveyor, the mixture 2 is also cooled.

The disadvantages of this installation are: a large output to the dump product, since the construction does not have a device for crushing large clods of waste mixture, which, especially when forming on machines with high specific pressure, 26355 .J

by pressing, they contain a large amount of suitable waste mixture or completely consist of it; large overall dimensions in the plan, due to the fact that the angle of inclination of the turns of the vertical-screw vibrating conveyor is limited and cannot exceed 8 °, in connection with which the placement of three turns 10 one above the other leads to an increase in the diameter of the conveyor.

The purpose of the invention is to improve the quality of the mixture and performance; installation.

15 I

This goal is achieved by

that the installation for the preparation of spent sand, containing a vertical screw conveyor conveyor comprising a supporting pipe, vibration supports, a vibration exciter, an upper screw tray with screening holes and openings for blowing cooling air, the lower

J screw tray, intermediate and end loading chutes, loading tags of the upper and lower screw chutes, are equipped with a crushing mechanism for lumps of the mixture, the upper screw tray is equipped with an additional discharge chute located in the upper part of the conveyor, and a partition installed behind the intermediate chute, and the bottom the screw tray of the above baffle has screening holes,

5 located above the working surface of the upper screw tray, with the intermediate chute connected to the loading chute of the lower screw tray using funnels, and a mechanism for crushing the clods of the mixture is installed between them.

FIG. 1 shows the installation, section; in fig. 2 shows section A-A in FIG. one; in fig. 3 - section BB

 in fig. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a section of YY in FIG. one.

The plant for the preparation of spent sand contains

0 the following units and elements of a vertical-screw vibrating conveyor, consisting of a carrier tube 1, with openings 2 for supplying air to the high pressure chamber 3, vibro5 supports 4, vibration exciter 5, upper screw tray 6 with openings 7 for rough sifting of material by a partition 8 and holes 9 for i blowing air through the mixture. In order to cool the lower screw tray 10 with holes 11 for thin material sieving and the partition 12, the loading chute 13 of the lower screw tray 6, the loading chute 14 of the upper screw tray 6, n intermediate discharge chute 15, end of chute discharging chute 16 of the lower screw tray 10, condo dumping chute 17 of the upper screw tray 6, a device 18 for moistening the hot mixture before: air blowing; mechanism 19 crushing to: omeev waste mixture, for example roll crusher with a boot 20 and. unloading 21 funnels. The installation is enclosed in a casing 22 with a flange 23 for connecting an injection duct and a flange 24 for connecting a ventilation system. The partition 3 of the upper screw chute is installed behind the intermediate discharge chute 15 and can serve as the wall of the discharge chute 15. The partition 12 of the lower screw chute 10 is installed behind the terminal discharge chute 16 of the lower screw chute 10 and can serve as the wall of the discharge chute 16. Openings 7 for coarse sifting of the spent mixture are made in the upper screw tray 6 from the loading chute 14 to the intermediate discharge chute 15. The holes 11 for sifting finely worked-out mixture are performed in the bottom Tov tray 10 above the working surface of the upper tray 6 vshe helical baffle 8. The holes 9 for purging the waste air CME B are performed in the upper tray 6 vshe helical baffle 12 above the high-pressure chamber 3. The installation works as follows. . The spent mixture enters the loading chute 14 of the upper screw chute 6 and under the action of vibration is transported along the upper screw chute 6 to the intermediate discharge chute 15. At the same time, the spent mixture falls 554 through the holes 7 to the lower screw chute 10, and the large inclusions that have not passed through holes 7, for about interstitial discharge chute 15 fall into the feed hopper 20, and through it into the crushing mechanism 19. The crushed mixture through the discharge funnel 21 enters the loading chute 13 of the lower screw tray 10. The spent mixture, sifted through the openings 7 for rough sieving, and the mixture passing through the crushing mechanism 19, is transported upwardly into the zone, where there are holes 11 for fine sieving. The particles of the material, having 1e sizes smaller than the sizes of the holes 11, fall through them and fall on the continuation of the upper screw tray 6 above the partition 8. The waste particles that have not passed through the holes 11 are removed from the installation through the discharge chute 16 of the lower screw tray 10. The spent mixture, after fine sieving, rising along the upper screw tray 6, passes through a humidification zone, where, using a humidifier 18, a certain amount of water is introduced into the mixture, depending on the temperature of the mixture. Then, the moistened waste mixture is transported through the upper screw tray 6 and is blown through the holes 9. Air is blown by a fan through an air duct connecting the casing 22 through the flange 23. Air is supplied through the flexible section of the air duct to the pipe 1 and then through the holes 2 to the high-pressure chamber 3. The cooled and sieved waste mixture through the end discharge chute 17 is discharged from the installation. Casing 22 serves to prevent dusting during plant operation. Air is drawn out from under the casing through an air duct attached to the flange 24. In comparison with the known one, the proposed installation allows a significant increase in the yield.

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Claims (1)

INSTALLATION FOR PREPARATION OF • WORKED FORMING MIXTURE, 'containing a vertically screw vibrating conveyor including a supporting tube, vibration mounts, vibration exciter, top screw tray with sifting holes and holes for cooling air blowing, lower screw tray, intermediate and end discharge upper and lower screw trays, characterized in that, in order to improve the quality of the mixture and the performance of the installation, it is equipped with a mechanism for crushing clods of the mixture, the upper the inut tray is equipped with an additional discharge chute located in the upper part of the conveyor and a partition installed behind the intermediate chute, and the lower screw chute above the partition has sieving holes located above the working surface of the upper screw chute: moreover, the intermediate chute is connected to the loading q chute of the lower screw tray with funnels, and a mechanism for crushing clods of the mixture is installed between them. I 1 126355