SU891548A1 - Method and apparatus for automatic monitoring of delivery of material from hopper - Google Patents

Description

(54) METHOD AND DEVICE FOR AUTOMATIC

CONTROL QUANTITY OF MATERIAL ENTRY

 one .

The invention relates to the automation of the control of the unloading of bunkers with materials prone to arching, and can be used in the automation of technological processes in the metallurgical, construction, coal and other sectors of the industry.

The amount of bulk materials coming from the bins through the dosing of the device is influenced by continuous disturbances due to the changing conditions of the outflow of materials from the bins. It is known that these disturbances. caused by a change in the height of the material in the bins, fluctuations in. The size and material size of the material, a change in the configuration of the outflow hole when it is clogged and cleaned, the material is suspended in bunkers, etc. When dispensing, such disturbances result in spontaneous. fluctuations in the supply of material.

A device is known for monitoring the hang-up of bulk electrically conductive materials, which contains pin sensors for the presence of material in a bunker located in the lower part of the bunker and near its side walls, as well as the silo of the bunker

the actuator provided by these sensors l.

The disadvantage of the device is its low reliability. Work, as it works in direct contact with the material.

The closest to the invention in its technical nature is a method for automatically controlling the supply of material for weight dosing, which consists in comparing the predetermined and actual capacity of the dispenser, as well as the device containing the master meter, the meter of the actual dispenser, 15 output delay unit and amplifier

However, the known method controls only the deviation of the material supply from the predetermined value, and the device, at a certain value of this deviation, gives out a discrete signal to turn on the induction apparatus, for example, an electrovibrator, for breaking the material. This solution does not take into account the value of the parameter, the change of which of the regul. The productivity of a drzato30 is determined, for example, the speed of its working

The change in the angle of inclination of the object’s static characteristics when the material is hung and its isico-mechanical properties change, therefore, it does not allow with sufficient accuracy to control the extent of material flow from the hopper during its placement and to ensure uniform output of the material to the metering unit.

The purpose of the invention is to improve the accuracy of controlling the degree of outflow of material from the bunker.

The goal is achieved by simultaneously measuring a signal proportional to the value of a parameter, changing which regulates the performance of the dispenser, for example, the speed of its working organ, and the static characteristic determines the calculated value of the dispenser's performance corresponding to the measured signal, and the magnitude of the signal proportional to the result calculating the ratio of the difference between the calculated and actual values of the performance of the dispenser to the calculated value, control the count The quality of the material from the bunker.

In addition, the device for carrying out the proposed method, comprising a meter of actual metering capacity, a calculating unit and a recording instrument, are connected in series a parameter meter, by varying which the metering capacity is controlled, the block for calculating the calculated capacity, and the delay block whose output is connected to one of the inputs computing unit, and its other input is connected to the meter of the actual capacity of the dispenser, and the output - to the recording device.

FIG. 1 is a block diagram of the device in FIG. 2 - static characteristic of the dispenser used.

; The device works as follows.

In the process of unloading material from the hopper to the metering unit, a signal proportional to the actual capacity of the metering unit, from meter 1, enters the input of the computing unit 2. At the same time, a signal proportional to the speed of the metering element, from meter 3, is fed to the unit 4 input, which, according to the static characteristic, the metering device calculates the calculated value of its capacity for the corresponding measured speed of the feeder. The output signal from the unit 4 for calculating the calculated capacity through the unit 5 delay enters the second input of the computing unit 2 with a time delay corresponding to the time of the material passing from the outlet of the bunker to the installation site of the meter 1 of the actual metering capacity.

J Block 2 calculates the ratio of the difference between the calculated Qp and the actual Q performance to the calculated one: Qj dp-

those. degree of expiry of material from

the hopper, which is then fixed by the recording device 6.

The latter can give a signal on the activation of the inducement apparatus for breaking the material in the bunker.

5 Example. When material is loaded from a bunker. On a belt feeder at the time of measuring its actual capacity, which was 36 t / h, the rotation speed of the electric drive of the metering device is 400 rpm, and the calculated value of its performance, calculated by the static characteristic and (Fig. 2) for such a speed is 40 ton / h.

5 In this case, the expiration rate of the material is reduced by 10%:

a.p. , 100% .1 °, 3b.

A decrease in the degree of outflow of material from the bunker indicates that the material hangs or its physical and mechanical properties change, with the result that the feeder switches to a characteristic with a smaller angle of inclination. To restore the normal outflow of material, an element of pneumatic or vibration damping is included.

Compared with the known method, the invention makes it possible to increase the accuracy of controlling the degree of outflow of material from the hopper when it is fed to the dispenser and, as a result, to ensure a uniform yield of material.

Claims (2)

1. Method for automatic control of the amount of receipt of material gg from the hopper when it is fed to the dispenser, based on measurement and comparison, of signals proportional to the target and actual capacity of the dispenser, characterized by  that, in order to increase the control accuracy, a signal is simultaneously measured proportional to the value of the parameter, by changing which the dispenser capacity is controlled, and the calculated value of its production is determined from the static characteristic of the dispenser. water content, corresponding to the magnitude of the measured signal, and the magnitude of the signal proportional to the result of the calculation of the ratio of the difference of the calculated and actual values dispenser performance to the calculated value, control the amount of material from the bunker. 2. A device for automatic control of material receipt from BunIfepa, containing a meter of the actual performance of the dispenser, a computing unit and a recording device, characterized in that, in order to improve the accuracy of control, a parameter meter connected in series is inserted into it; calculating the calculated performance, and the delay unit, the output of which is connected to one of the inputs of the computing unit, and the other its input is connected to the measurement Telem actual performance of the dispenser, and the output - with a recording device. Sources of information taken into account in the examination 1. USSR author's certificate Q No. 500151, cl. 65 65/68, 1976. 2. Mechanization and automation of production; 1976, 2, p. 40 - 41 (prototype).