SU1585002A1 - Method of automatic controlling of a group of crushers operating in parallel - Google Patents

Abstract

The invention relates to the automation of crushing processes in crushers, can be used in crushing and screening plants, mainly for the processing of rubble, and allows you to improve the quality of control. To achieve this goal, the power consumed by each of the crushers and the size of the combined product are measured, the integrated energy consumption for crushing for each of the crushers is calculated and the size of the discharge gap is reduced in the direction of decrease of the crusher with the highest integrated energy consumption when the combined product size is greater than values, and when the crushers are temporarily disconnected without changing the size of the gap, the integral energy consumption for each crusher is memorized, and the appearance of the crusher with the highest and integral power inputs, taking into account the previously achieved level. 1 hp f-ly, 1 ill.

Description

The invention relates to the automation of the crushing process in crushers and can be used in automatic systems for monitoring and controlling technological processes at crushing and screening plants, mainly for the processing of rubble,

The purpose of the invention is to improve the quality of control.

The drawing shows an interconnection diagram of the process equipment and units for implementing the proposed control method.

The essence of the method is as follows.

After measuring the size of the crushing product combined on a common discharge conveyor, the integrated crushing energy costs for each of the parallel crushers are additionally calculated for the time elapsed since the adjustment of the discharge gap of each individual crusher.

The integral energy consumption for crushing is obtained by integrating the useful power over time minus the idling losses from the total energy consumption.

In order to control the group of parallel

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crushers when increasing the size of the combined product of crushing, the size of the discharge gap is reduced at the crusher with the largest (among the crushers) integral energy consumption. Conversely, if for some reason grinding of the combined product occurs (for example, a decrease in the strength of the original product), then the size of the discharge gap is increased at the crusher with the least integral energy consumption.

When temporarily turning off the shot-ducks, not accompanied by an adjustment of the slit, the integral energy consumption of Ybi for crushing is memorized, and when it is switched on again, their counting is continued until the level reached.

The technological equipment is represented by an intermediate bunker 1 and a group of crushers 2 installed above the common discharge conveyor 3. The measurements are carried out by a rupture sensor C} with a comparison element 5 (unit 6 and power sensors 7 with threshold elements 8 and integrators 9, and controllers) the impact of the selector 10 pulses and devices 11 adjust the size of the unloading & slits cracks 2.

The method is carried out as follows.

Crushed stone from the intermediate hopper is loaded into the crushers 2, after which it enters the common conveyor 3. The crushing products of all the crushers 2 on the conveyor 3 are mixed and averaged. The technological procedure of the enterprise provides for crushing the product to a certain size that is optimal for this technological process. due to the gradual increase in the size of the discharge gap of the crusher due to wear of the linings, which depends on the amount of crushed material fusion in a separate crusher is also proportional to the amount of crushed material

Thus, integrating in time the value of power consumed by an individual crusher for crushing, i.e. capacity minus losses of idle, you can judge the amount of wear of the linings of this crusher. There is no need to control the wear of linings from the moment they are installed,

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how the size of the discharge gap is periodically restored by adjustments.

 If it is conditionally accepted that after adjusting the energy consumption for crushing by this crusher is zero and to sum it up from the moment of installation of the required size of the discharge gap, then the achievement of a certain integral level of energy consumption will reliably indicate the wear of the linings and the need to reduce the size of the crusher gap. However, since the ultimate goal of the crushing process is not to maintain the specified slit size, but to obtain a product of the required size, the need for adjustment is determined by the signal from the large size sensor.

In the general case, several crushers work on a single discharge conveyor and the particle size sensor measures the composition of the combined crushing product. The adjustment of the discharge gaps at crushers is not performed simultaneously. Therefore, at the time of measuring the particle size, they have different cracks. The largest product produces a crusher with a larger gap, i.e. one that has worked more and has a correspondingly higher integral energy consumption indicator since the previous adjustment. Therefore, it is for this crusher that the slit must be changed using the adjustment device.

PRI me R 1. There are six crushers installed above the common conveyor in the DCS process line, all of which are in operation. If the particle size sensor k does not indicate a deviation of the particle size of the combined crushed product from the norm, the crushers operate as before. When the particle size is increased to the level determined by the setting device 6, the comparison element 5 receives a signal to the selector 10, which transfers it from the standby mode to the measurement and adjustment mode. If the selector 10 notes that of the six integrators, the third has the greatest readings, for example, one-third of the crusher worked the most without the other, and most likely it had an insufficient degree of crushing and produced a large product. To restore the required size (gap size)

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The selector 10 processes the control signal to the device 11 for adjusting the size of the discharge gap of the third crusher via the third channel. After reducing the size of the slit to a predetermined value, the readings of the integrator 9 of the energy consumption associated with the adjustable third crusher are reset, its counting begins anew, with zero. In the general case, the power sensor-integrator unit can be replaced with an electricity meter, clouded with D ° idle loss level.

Further two options are possible.

The size of the crushing product does not exceed the norm - no additional control actions are needed.

The size of the crushing product is still more than normal - then the selector will work out the control signal to the adjustment device of the crusher, in which the integrator (electricity meter) will be small by the current time. With a strong deviation of the size from the nominal value of such steps there can be several.

Example 2: Suppose that only a fraction of the group of parallel-installed crushers is in operation, for example, four out of six. In this case, the selector receives signals only from four crushers and the size adjustment of the discharge gap is made (if necessary, also with these crushers. The system must be adjusted so that when any crusher is turned off and on again, the energy counter of this crusher is memorized. Then, the inclusion of the power integrator after stopping the fifth crusher will reliably characterize the degree of wear of its armor.

To control the operation of cone crushers under production conditions, control of the size of the discharge, spruce with the help of lead cylinders, passed on the wire through the cavity of the crusher, is used. According to the results of such control (thickness of the flattened cylinder), it is not possible to predict the results of crushing accurately enough, since they are also affected by the physicomechanical properties of the rock mass.

The use of particle size sensors for each of the parallel crushers is practically impracticable, and the proposed method makes it possible to dispense with a single grain size sensor.

The application of the proposed method makes it possible to reduce the downtime at the DSS, since, according to a known method, the discharge gap is measured while the material is being fed for crushing.

Claims (2)

1. A method for automatically controlling a group of parallel crushers, including measuring the power consumed by each of the crushers, the size of the combined product, and changing the size of the discharge gap, characterized in that, in order to improve the quality of control, the integrated energy costs for crushing are calculated for each of the crushers, since the previous measurement of the discharge gap, and the change of the size of the discharge gap is carried out in the direction of decreasing for the crusher with the highest integrated energy consumption when the combined product size is exceeded by a given value. 2. A method according to claim 1, characterized in that when the crushers are temporarily disconnected, the integral energy consumption for each crusher is memorized, and the revelation of the crusher with the largest integral energy consumption is carried out taking into account the previously achieved level.