SU1572958A1 - Method of automatic metering of charge components from hopper - Google Patents

Abstract

The invention relates to the dosing of materials in the chemical, metallurgical, construction and other industries of the industry and can be used, in particular, for the dosing of the sintering mixture. The purpose of the invention is to improve the quality of dosing. The method of automatic dosing of the charge components is implemented by a device that provides control of the disc feeder 3 in terms of flow rate and derivative of the flow rate, the latter being carried out only for the period of prompting the flow of charge components fed to the feeder 3. 1 sludge.

Description

(L

WITH

.

us

t-SL N1

CE

you ate

00

The invention relates to the dosing of materials in the chemical, metallurgical, construction and other industries of the industry and can be used, in particular, for the dosing of the sintering mixture.

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

The method of automatic dosing of the components of the charge from the bunker consists in changing the material consumption from the bunker and, if its current value mismatch with the given material, changes the material consumption, determines the derivative of the current value of the consumption value in time and with the derivative value less than its predetermined value, or the signal from the sensor, the absence of material induces consumption and, additionally, for the period of inducement, the consumption of material from the bunker is changed depending on the magnitude of the error of a given and the current grandeur of the derivative.

The drawing shows a scheme implementing the method.

The circuit contains a setting device 1, a controller 2, controlling a disk feeder 3 according to the signals received through the converter 4 from the component consumption sensor 5, a differentiator 6, a control unit 7 of a booster device 8 and a switch 9, switching the output signal of the differentiator b to one of the control inputs torus 2 for the duration of the operation of the trigger device 8, and for the rest of the time - at unit 7 of the control. The constant time of the differentiator is approximately equal to the rise time of the transition process of dosing. The specific value of the constant time depends on the dosing scheme adopted and can vary within a small range,

The method is carried out as follows.

For example, dosing of the components of the charge: limestone, ore, concentrate, scale and coke is carried out in a certain ratio. The components are metered using a plate feeder and fed through a belt weigher onto an assembly conveyor. Suppose that in a bunker with coke began to hang, its consumption began to decrease. The signal from the weighing gauge of the component consumption flow sensor 5 goes to the converter 4, and from it to one of the inputs of the coke consumption controller 2 and differentiator 6. The output signal of the controller output, obtained by comparing the signal of the actual flow rate and the signal of the setting device 1, through the intermediate element begins to act on the feeder 3, trying to maintain a given coke consumption. The speed of the plate feeder 3 is increased to

as long as the target flow is restored, those. while the hangup continues. At the same time, from the output of the differentiator 6, through the key 9, the signal on the rate of change of the decrease in the flow rate over time (derived flow rate) enters the control unit 7 of the booster device 8, In the control unit 7, the signal of the derived flow rate is compared with the specified one. If the actual derivative signal exceeds the specified one, then the control unit 7, via an intermediate relay, turns on the trigger device 8 in the coke hopper. Simultaneously with the activation of the trigger device 8, the key 9 commutes the circuit to

sending the signal of the derivative of the flow from the output of the differentiator 6 to another input of the regulator 2. The regulator 2, receiving a signal from the differentiator b (and at the moment of operation of the trigger device 8, the signal is sharp

will increase), reduces the speed of the plate feeder 3 in accordance with the derivative of the flow rate (rate of flow change) over time, which reduces the overshoot time after switching off the incentive

device 8 key 9 commutes the output circuit of the differentiator b again to the input of the control unit 7

Provision is made for the triggering device 8 through the control unit 7.

a signal from the sensor of the absence of material (representing, in particular, a limit switch installed at the output of the measuring unit). After switching on the motive device, the operation of the circuit occurs as follows: during the period of increasing component input to the feeder 3 from the differentiator b, through the key 9, the regulator 2 receives the correction signal of the flow derivative by

5 times, which makes it possible to dose more accurately, more precisely, to maintain a given ratio between the components being dosed. The operation time of the trigger devices is selected depending on

0 specific conditions (in the scheme that implements the method, the time selected 5-15 s).

Claims (1)

The method of automatic dosing of 5 components of the charge from the bunker, which consists in measuring the material consumption from the bunker and changing its current value to the specified value, changing the material consumption, determining the derivative of the current value of flow rate for time and with the amount of dosing, additionally for a period of derivative, less than its specified value, Judgments change the consumption of material from or, according to a signal from the sensor, the absence of a material-bunker, depending on the size of the rasagrial, is prompted by a flow that distinguishes-lacquering a given and current value, so that, in order to improve quality, 5 consumption.