SU1473852A1 - Method of automatic control of crushers operation duty - Google Patents

Abstract

This invention relates to crushing processes. It can be used in the automatic control systems of the operating mode of crushers used in various sectors of the national household. Allows you to improve the quality of management. To achieve this goal, a sample of the source material is taken, the volume of the intergranular space of the source material and the bulk mass are calculated, and the motion of the moving member is changed depending on the volume of the intergranular space or the bulk mass. 2 Il.

Description

take an interval of 10 mm and determine the bulk mass of rubble in FR. from 5 to 20, from 5 to 30, from 5 to 40, from 5 to 50, from 5 to 60 and from 5 to 70 mm. In the specified range, it changes its value from 1.35 to 1.45 t / m3. Then, the volumes of intergranular space, which are formed in the crushing chamber when crushed stones of various sizes enter it, are determined experimentally or by theoretical calculations. m3. By knowing the parameters of the crushing chamber formed by a moving and stationary body, the relationship between the size of the intergranular space and the mode of operation (stroke) of the moving body l fiJVMn) or bulk density 1 is determined.

 f (f).

For ease of use

build a graph of the bulk density, which characterizes the intergranular space of the crushed material, and the course of the rolling body, providing maximum crushing efficiency in a given range (figure 2).

The method is as follows.

The source material is fed from the hopper 1 to the crusher 2, and then conveyed by conveyor 3 to the screen at screen 4. The finished product is stored and the over-dimensional is conveyed by conveyor 5 for additional crushing. The sampler 6 periodically or continuously takes samples of the source material and serves them on the meter 7 of the intergranular space (bulk mass) of the source material. The current value of the bulk density (intergranular space) of the starting material is determined. The current value of the bulk mass (intergranular space) is compared with the found dependence, and the optimum mode of operation (movement of the moving member) of the crushing machine is determined.

The optimum stroke value is determined by comparing the current value (intergranular space) of the bulk mass according to a graph.

The adjustment of the operating mode of the crushers is carried out by known methods.

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Example. It is necessary to correct the stroke of the moving member of the crusher with the initial size of crushed stone from carbonate rocks FR. 5-40 mm. Gauge 7 determines the amount of intergranular space of rubble entering the crushing chamber, adds it to the found relationship, or compares it with the graph and obtains the optimal value of the stroke of the moving member.

When the volume of intergranular space is, for example, 0.21 m3, the optimal stroke (from the graph) corresponds to 28 mm.

It is necessary to correct the crushing mode of rubble from granite with a particle size of 5-40 mm.

Gauge 7 is used to determine the aggregate mass of rubble, add its values to the found relationship, or compare it with a graph and get the stroke value. Poured granite mass fr. 5-40 mm is equal to 1.4 t / m3. The optimal stroke (from the graph) corresponds to 32 mm.

The use of the value of the intergranular space of the initial mass to control and control the mode of operation of the crusher is due to the fact that it is inversely proportional to the power law depending on the bulk mass. This degree characterizes the relative compaction of bulk materials, since absolute compaction is almost impossible to achieve.

With a larger value of the bulk mass in the source material, the pieces, its components, are larger, and with a smaller one, smaller. The specific surface of large pieces is smaller than that of small pieces of the same mass of material. The intergranular space in the material of large pieces at the same time less, and in the material of small pieces more. In this case, the compaction of large pieces of crushed material is manifested to a greater extent than of small pieces.

The adjustment of the motion of the rolling organ until the material is pressed in the layer is due to the fact that absolute compaction (obtaining a dense body) on the one hand cannot be achieved, and on the other can lead to a negative effect, i.e. to the crushing of the crusher crushing zone. Therefore, the crushing should occur before the material is pressed. This moment is determined experimentally, taking into account specific physicomechanical and other factors when determining the dependence of the motion of a movable organ on the intergranular space or on the bulk mass.

The relative compaction of the intergranular space of bulk materials is possible when the material is crushed in a layer, and this is an increase in the efficiency of crushing.

The method makes it possible to improve the quality of control of the operating mode of the grinding machine, as well as to increase the efficiency of its use.

The economic efficiency of the method of controlling the mode of operation of the crusher is achieved by increasing the yield of product fractions g

14738526

Claims (1)

10-15% of material, as well as increasing the reliability of operation of the crushing machine and the prevention of emergency situations. Invention Formula A method of automatically controlling the operation mode of crushing machines, including sampling and analyzing a sample of the starting material and changing the stroke of a moving member, characterized in that, in order to improve the quality of control, the analysis of the sample of the starting material measures the volume of the intergranular space before it is pressed in a layer or bulk the mass, and the change in the stroke of the movable organ are made depending on the deviation of the measured parameter from the specified value. initial mmmmnshn material Fiel Finished product i t.50 W IW W UO 125 Uq 25 50 75 I, MM FIG. 2