SU1571413A1 - Batcher for loose materials - Google Patents

Abstract

This invention relates to a weighing technique, in particular to metering and weighing bulk materials in a stream. The aim of the invention is to improve the accuracy of dosing. The bulk material dispenser allows theoretically unmistakable determination of the instantaneous performance value at the inlet of the weighing conveyor 1 of the cantilever type with a fixed support from the discharge side of the material at any time. The dispenser contains a power converter 2, a power supply 3 with an electric drive 4, a magnetic amplifier 5, a differentiator 6, an integrator 7, an adder 8, an additional adder 9, an inverter 10, a delay element 11, a performance regulator 12, a capacity setpoint 13, a total mass metering unit 14 and the registrar 15. 1 Il.

Description

The invention relates to weighing equipment, in particular to the dosing of bulk materials, and can be used in the development of continuous dispensers for conveyor scales of increased accuracy.

The purpose of the invention is to improve the accuracy of dosing and to ensure high accuracy in determining the total mass of a material, regardless of the unevenness of its distribution in the belt of the weighing conveyor during movement,

The drawing shows a structural diagram of the proposed dispenser,

The dispenser consists of a weighing conveyor 1 of a cantilever type with a fixed support from the discharge side of the material, a power converter 2, a feeder 3 with electric drive 4, a magnetic amplifier 5, a differentiator 6, an integrator 7, a first 8 and a second 9 adders, an inverter 10, a delay element 11, controller 12, capacity control 13, unit 14 for taking into account the total mass of material in the secondary recording device (recorder) 15,

The dispenser works as follows.

The electrical signal F (t) from the power converter 2, proportional to the force generated by the material passing through the weight conveyor, is fed to the input of the 6 "differentiator

At the output of the differentiator 6, a signal is obtained representing

Al & l

first order derivative

cU

signal of force F (t), which is fed to the first input of the first adder 3 "

The second input of the first adder 8 is given a signal t

- (Q (0, t) - Q (0, t -Ј)) dt,

i «0

which is formed from the output signal Q (0, t) of the first adder 8 using feedback covering the delay element 11, the inverter 10, the second adder 9 and the integrator 7 "

The delay element 11 delays the analog signal Q (0st) for a time equal to the residence time of the material.

on the weight transport. Next, this signal (Q (0, t - Ј) is inverted by the inverter 10 and fed to

the second input of the second adder 9, the first input of which receives the signal Qft) from the output of the first adder 8; At the output of the second adder 9, the difference of two signals Q (0, t) Q (0, t - C) is formed, which is integrated with the help of the integrator 7 and is fed to the second input of the first adder 8,

As a result, the output of the first adder 8 is a signal

Q (0, t) d-JP n- 1 j (, t) 20

- Q (0, t -P) dt,

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which is a function of changing the instantaneous performance at the start of the weighing conveyor 1 over time,

5 From the output of the first adder 8, the instantaneous performance signal Q (0, t) is fed to the inputs of the secondary recorder 15 (for recording an analog signal) and block 14

0 taking into account the total mass of the material, where this signal is integrated over time, the voltage signal is converted into a frequency signal and the sum of successive incoming pulses in the counter, the reading of which corresponds to the total mass of material passed through the weight conveyor.

The instantaneous output signal Q (0, t) is also fed to the first input of the performance regulator 12, to the second input of which a reference signal is received from the setting unit 13 of the performance.

/ s The unbalance signal generated at the output of the regulator 12 after amplification by means of a magnetic amplifier 5 acts on the actuator 4 of the feeder 3, which, by increasing or decreasing the speed of its tape, t, e, increases or decreases the material flow, maintains the performance of the system at a given level.

Claims (1)

Invention Formula Bulk dispenser containing motorized feeder, cantilever conveyor, receiving box which is connected to a power converter, a magnetic amplifier, a performance controller, an adder, a differentiator, a performance setting unit, a total mass determination unit and a recorder, characterized in that, in order to improve accuracy, an integrator, an additional adder, an inverter are entered into it and a delay element, - the output of the power converter is connected through the differentiator to the first input of the adder, the output of which is connected To the first input of the performance controller, the inputs of the total mass metering unit and the recorder, the first input of the additional adder and through the delay element and the inverter are connected to the second input of the additional adder, the output of which is connected via the integrator to the second input of the adder. the second input of the performance controller, the output of which is connected through a magnetic amplifier to the electric drive of the feeder.