SU1253670A1 - Method of regulating classification of loose material by size - Google Patents

Description

one

The invention relates to the regulation of the process of classifying bulk materials by size and can be used in concentrating plants and crushing and sorting plants for the production of rubble in the stages of preliminary and screening.

The aim of the invention is to improve the accuracy of the regulation of the particle size distribution of classification products.

The essence of the invention is as follows.

The number of regulated fractions of the material by size in screening products can be determined by the formula.

m p - 1

) where n - the number of screening surfaces with different sizes of holes.

For example, in a screening operation, the undersize product is the final product of crushing at a crushed stone screening plant and is a mixture of different crushed stone fractions by size.

The sub-net product is sent to the separation compartment, where it is divided into rubble of different fractions by size. The oversize product is usually sent for re-crushing.

The granulometric composition of the sublattice product is determined by the dimensions of the openings of the screening surface. The larger the size of the holes of the screening surface, the larger the fraction of the material transferred into the undersize product. If the screening process is carried out on two screening surfaces with different sizes of holes arranged in parallel (possibly on two screens), the KpyniiocTb of the undersize product depends on which scattering surface the classified material is fed to.

When classifying material on a screening surface with smaller apertures, the undersize product contains more fine fractions as compared with the undersize product obtained on a screening unit 536702

surfaces with large hole sizes, since the material is smaller than the size of the screening holes: surfaces with large sizes

5 holes, and the material is larger than the size of the holes of the screening surface with smaller hole sizes, passes into the oversize product.

 О If you apply all the classified material to the screening surface with large hole sizes, then the material of this size will go into the undersize product and

15 thereby reducing the content of fine fractions of the size of the material in the undersize product.

The amount of material of fineness is smaller than the size of the holes of the 20 knocking surface with larger sizes of holes, and larger than the size of the holes of the screening surface with smaller sizes of holes that move, respectively,

25 the undersize and oversize products of these sifting surfaces can be adjusted by distributing the classified material between the sifting surfaces with different hole sizes.

The amount of material with fractions is larger than the smaller opening, and smaller, than the larger opening that goes into the oversize and undersized product, is determined by the amount of starting material fed to each screening surface. If you increase the amount of material supplied to the screening surface with smaller apertures and reduce its supply to the screening surface with larger apertures, the proportion of fine fractions in the undersize product will increase proportionally and, conversely, with an increase in the amount of material fed to the –sowder surfaces larger holes, and a decrease in the amount of material fed to the screening surfaces with smaller holes, proportionally contents are large fractions of the material in the sieve

5 product, i.e. to adjust the particle size distribution of the products of material classification by size, an amount of 40

50

The material supplied to the screening surfaces with smaller orifice sizes, varies s inversely proportional to the symmetry, and the screening surfaces with larger aperture sizes are directly proportional to the content of small size fractions in the classification product.

Thus, smoothly changing the amount of the initial classification material supplied to each screening surface with different hole sizes, it is possible to control the particle size distribution of the classification products with high accuracy.

The control accuracy is higher, the more screening surfaces are used with different hole sizes. In this case, the number of adjustable fractions of material size in screening products can be determined by the formula

m

n - 1

where n is the number of screeners

surfaces with different hole sizes.

The drawing shows a block diagram of an apparatus for implementing a method for regulating the process of classifying bulk materials by size.

The device comprises a conveyor 1, a distribution device 2 with a material divider 3 installed therein, a screen 4 and a screen 5 on which sieves with different orifice sizes are installed, conveyors 6 and 7. Conveyor 6 is connected with a sensor 8 containing fine fractions in the undersize , classification products connected to one input of the regulator 9, the second input of which is connected with a signal setter 10 proportional to the required value of the particle size distribution.

The output of the regulator 9 is connected to the input of the actuator P connected with the divider 3 of the material flow.

The method of regulating the classification process of bulk materials by size is carried out as follows

The original classified material from the conveyor 1 enters the switchgear 2, where

the material flow divider 3 is distributed between two screens 4 and 5, on which screens are installed with different hole sizes: at screen 4, with larger hole sizes (eg, 70 mm), at screen 5, with smaller hole sizes (for example, 40 mm ).

The oversize product of screens 4 and

5 is combined on the conveyor 7 and is fed for re-crushing. The sub-product of screens 4 and 5 is fed to the conveyor 6 and the content of fines is measured by sensor 8.

The signal from sensor 8, proportional to the actual content of fine fractions of the material in the undersize product, is fed to the input of controller 9. At the same time, to the input of regulator 9, a signal is proportional to the required content of small fractions of material, from the setting device 10.

On the measuring block regul.

For torus 9, these signals are compared and, depending on the deviation of the actual value of the particle size distribution from the value specified in controller 9, a signal is generated. C signal

the regulator 9 is fed to the actuator 11, with which the material flow divider n is moved; the amount of material supplied to each screen 4 and 5 is redistributed. The redistribution of the amount of material between screens 4 and 5 will lead to a change in the particle size distribution of the undersize product and to obtain the required content of different fraction fractions in

undersize product

If, for example, there are fine fractions of material size in a classification product, the measured

By the sensor 8, less than the specified value, then when comparing the signals of the sensor 8 and the setting device 10 in the controller 9, a negative signal is generated, which is fed to the actuator

mechanism 11, which turns the divider 3 material flow and increases the amount of material supplied to the screen 5 with less. size of the holes, and accordingly reduces the amount of material supplied to the screen 4 with large hole sizes, resulting in the undersize product

The content of small fractions of the particle size increases.

If the content of fine fractions of material size in the undersize classification product, measured by sensor 8 on conveyor 6, is more than a specified value, then when comparing sensor 9 signals and setting unit 10 signals to controller 9, a positive signal is output to the actuator 11, which rotates the divider 3 material flow and increases the amount of material supplied to 1 rohot A with larger orifice sizes, and accordingly reduces the amount of material supplied to roar 5 with smaller openings s, whereby a classification undersize material content increases bs5lshey size and decreased content of fines of size material

Thus, due to the continuous measurement of the granulometric

Editor M, Kelemesh Order 4662/12

Compiler B, Persits

Tehred L, Serdyuk: ova Proofreader M. Sharoshi

1 irage 565 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-355, Raushsk nab., 4/5

(production and printing company, Uzhgorod, Proektna st., 4

53670,

the composition of the classification products by the sensor 8 on the conveyor 6, the comparison in the controller 9. the signals of the sensor 8 and the setting device 10 and the generation of a control signal to the actuator 11, changing the position of the divider 3 material flow, which simultaneously controls the amount of material supplied to the screen 10 D and 5, fine grading of bulk materials is carried out.

The use of the invention makes it possible by measuring the content of fine fractions of rubble in screening products, as well as by distributing the initial material of the size classification between screening surfaces 2Q with surfaces of different hole sizes, depending on the content of fine material fractions in screening products, significantly to increase the accuracy of the regulation of the granulometric composition of screening products.

Claims (1)

METHOD FOR REGULATING THE PROCESS OF CLASSIFICATION OF BULK MATERIAL BY LARGEITY, including the distribution of material between screenings and in order to increase the accuracy of regulation of the metric composition of the classification products by the granule, the content of fine fractions in the sublattice classification products is measured and the bulk material is distributed between the screening surfaces according to the measured value of the content of fine fractions, and the amount of material fed to the screening surfaces with smaller hole sizes, change inversely, and on screening surfaces with large hole sizes - directly proportional to the content fine fractions of fineness in padded product surfaces with different sizes G SU ... 1253670 A