SU1474474A1 - Continuous-action metering apparatus - Google Patents

Abstract

This invention relates to a weight measuring technique. The invention makes it possible to increase the metering accuracy due to the fact that the signal F (T) from the power converter 2 is fed to the input of differentiator 4, the output of which is a signal that is a derivative of the first order of the DF (T) / DT function F (T) The second term, which is fed to the input of the adder 5, is formed by feedback through a delay element 6, which delays the output signal QT of the adder 5 by a time Τ equal to the residence time of the material on the conveyor belt movingconstant speed V = CONST. 1 il.

Description

4i

h

4 4 4 1 4

The invention relates to weighing technology, in particular to the dosing of bulk material in a stream using a weighing conveyor.

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

The drawing shows a structural diagram of the dispenser.

The dispenser consists of a weighing conveyor 1, a power converter 2, a differentiator 3, an adder 4, a delay element 5, a registering device 6, an integrator 7, a controller 8, a setting unit 10 for performance, an amplifier 10, an electric drive 11 and a feeder 12.

The dispenser works as follows.

The electrical signal F (t) from the transducer 2 is proportional to the force generated by the weight of the material passing through the weighing conveyor 1 and is fed to the input of the differentiator 3, the output of which is a signal that represents

dF (t)

first derivative

at

function F (t), which is fed to

the first input of the adder 4. i

The second term, which is fed to the input of adder 4, is obtained using feedback covering the delay element 5, which delays the output signal Q (t) of adder 4 by a time equal to the time spent on the conveyor belt moving with a constant V const.

As a result, the output of the adder is a signal equal to

Q (t) + q (t -),

de Q (t) is the value of the instantaneous performance directly at the input of the weighing conveyor at the moment of time t (capacity of 50 feeder);

Q (t-Ј) - the value of the instantaneous performance at the exit of the weighing conveyor at the moment t (manufacturer- 55

-

five

0

five

0

50

five

0

five

dF (t) dt

the nosity of the dispenser itself) or the value of productivity directly at the input of the weighing conveyor at the moment of time (t-Ј);

- the rate of change of load on the weighing conveyor.

From the output of the adder 4, the instantaneous performance signal Q (t) is fed to the inputs of the registering device 6 for continuous recording of the analog signal and integrator 7 for determining the total (integral) mass of material passed through the weighing conveyor of the metering device, according to the formula

i G J Q (t) dt.

ti

The instantaneous performance signal Q (t) is also fed to the first input of the controller 8, to the second input of which a reference signal is supplied from the setpoint controller 9.

The unbalance signal generated by the regulator after amplification with the help of the negative actuator 10 acts on the actuator 11 in the direction of increasing or decreasing the performance of the feeder 12.

Claims (1)

Invention Formula A continuous dispenser containing a weight conveyor with a power converter and an electric drive, a performance adjuster associated with the first input of the regulator, the second input of which is connected to an adder, characterized in that, in order to improve the metering accuracy, a recording device, an integrator, an amplifier, a differentiator and a delay element, the output of the power converter being connected through a differentiator to the first input of an adder, the output of which is connected to the second input of a sum through a delay element and as well as the recording device and the integrator, the output of the regulator via an amplifier coupled electrically.