SU1585687A1 - Method and apparatus for determining dynamic graduation and checking belt-conveyer weighers - Google Patents

Abstract

The invention relates to a weight measuring technique and allows to improve the accuracy of calibration and calibration of belt scales. Belt scales are subjected to a periodic load, the output signal of the scales is delayed by a time multiple of or equal to the loading period of the load load, and then subtracted from the current value, the transient response of the scales is calculated from the difference signal. The signal from the output of the belt scales 3 through the delay line 1 is fed to the subtracting input of the algebraic adder 2, to the summing input of which the signal goes directly from the output of the balance 3. From the output of the adder 2, the signal through the forming unit 4 is fed to the recording device 5. 1 Il.

Description

O1 CO

JV with: oo h

This invention relates to a weight measuring technique.

The purpose of the invention is to improve accuracy.

Dynamic calibration and calibration of belt scales are carried out using a calibration load, which is periodically loaded with the load receiving section of the scales.

The output signal of the balance is delayed by a time equal to or a multiple of the period of loading with the reference load, and the delayed signal is subtracted from the current value of the output signal of the balance, the transition characteristic of the balance is calculated using the resulting difference signal from the expression:

aj со, (С) - Z. (i :).

de cOjCt) - Z (0) a. - i

impulse transient response of the balance, the difference value of the current output of the balance and the signal delayed by time T; coefficient determined from the formula:

ll; -ti: GCtTdt,.

where t

t G (t)

the delay time of the output signal of the scale; current time; value of verification load; Oh, 1,

2 - the number of loads. The drawing shows a block diagram of a device for dynamic calibration and calibration of belt scales. . ,

The device contains a line 1 - delay, algebraic adder 2, belt scales 3, forming block 4 and recording device 5.

The device works as follows.

On conveyor scales 3 act simulating periodic load with a period T ,. The signal from the output of conveyor scales 3, shifted by the line 1 delay time T, is fed to the subtractive input of the algebraic adder 2, the summing input of which receives the current signal from the output of conveyor weights 3.

From the output of the algebraic adder 2, the signal through the forming unit 4 enters the registering instrument 5, which registers the impulse transient response of the belt scales 3.

The frequency of the simulating load T and the delay time T are related by: T -, (k 1, 2, ...).

Forming unit 4 exact function of the form:

has pereda (p)

R

whose coefficients are determined by simulating the load from the relation:

T

J (T - t)

but .

i i

G (t) dt.

Claims (2)

1. The method of dynamic calibration and calibration of conveyor scales, which consists in periodically loading the weigh-in portion of the scales with a verification load, measuring the output signal of the scales and calculating the transient characteristic of the scales, characterized in that, in order to improve the accuracy, the output signal of the scales is delayed by time equal to or a multiple of the period of the load with the reference load, and subtract it from the current value of the output signal, and the transient response of the balance is determined from the expression 45 g -f tu. (() Z (t). 0 five Where but. lilt) i i W-CC) z (C) t G (t) dt - COEFI0 scyent;  pulse transition characteristic of scales; the value of the difference between the current output signal of the scale and the signal delayed by time T; output delay time;  158568G. 6 . - current time; so that, in order to improve accuracy, the lines are entered into it / - the number of loads; delays and algebraic adder, G and; - the value of the verification load-. with one input algebraic sum-. the mator is connected to the exit of the conveyor ,, „Weights, and the other - to the same exit 2. A device for dynamic through delay lines, and the output of algebra calibration and verification of a conveyor belt accumulator through a generator, containing a forming unit and a block, are connected to a registering device that differs from a registering device.