SU1654672A1 - Method for dynamic calibration and checking of conveyer balance and device for effecting this method - Google Patents

Abstract

The invention relates to a measurement technique and can be used for dynamic calibration and calibration of continuous weighing devices. The use of dynamic calibration method and device for its implementation allows to increase the accuracy of determining the transient characteristics of the weighing device due to the fact that the load receiving section of the weighing device is loaded with a variable turning load, and the signal of the weighing device is fed to the input of the first adder 1, the output of which is connected to the summing input the second adder 2 directly, and with the subtractor through a delay element 3, the output of the adder 2 is connected through the forming unit 4 and the block 5 of the functional circuit forming a second input of the first adder 1, the unit 6 detects the transient response of the weighting device. 2 sec. f-ly, 1 ill.

Description

The invention relates to measuring technique and can be used. For calibration and calibration of continuous weighing devices.

The purpose of the invention is improving the accuracy of calibration.

The drawing shows a structural diagram of a device for implementing the method.

The device consists of the first block 1 of algebraic summation, which by its output is connected directly to the first input of the second block 2 of algebraic summation and through the delay element 3 with its second input. The output of the second algebraic summation block is connected through the forming block 4 and the functional converter 5 to the first input of the first algebraic summation block, the second input of which is directly connected to the output of the weighing device, while the output of the forming block is directly connected to the input of the recording device 6.

The method is as follows.

The load-receiving section of the weighing device is loaded with a test load G (t) by moving it. Tape / The signal from the output of the weighing device is fed to the summing input of the first block 1 of algebraic summation, p. the output of which goes directly to the summing input of the second block 2 of the algebraic summation and shifted by the delay element 3 for a time T goes to the subtracting block 2 of the algebraic summation.

From the output of block 2 of the algebraic summation, the signal through the forming block 4 is supplied to the device 6, which registers the transition characteristic of the weighing device.

The forming unit has a transfer function of the form

the coefficients of which are determined by the verification load in accordance with the relation a _t = j G ( _t ) dt о. *!

The functional transformation block calculates the convolution of two functions, the first of which is the output signal of the forming block ω (τ), and the second · is the moving difference of the verification load G (t):

φ (?) J ^ω ( ^g ) [θ (7 4-Т-4 /)] d ν.

•about

The parameter T is selected from the condition of ensuring the required accuracy of determining the impulse response characteristic.

The functional transformation unit can be performed, for example, in the form of a computing device that computes the verification integral of the reconciliation of two functions.

Claims (2)

Claim 1. A method for dynamically calibrating and calibrating a conveyor scale, including loading the load receiving portion of the scale with a test load, registering the output signal and determining the impulse response characteristic, distinguishing it by the fact that, in order to improve accuracy, the output signal of the conveyor scale is delayed for a time interval T, then it is subtracted from the current output signal and the transient response is determined by the solution of the integral equation [G (τ-v) - G (τ + Ύ - ν,)] d ν = Ζ (τ) where ω (τ) is the pulse transfer characteristic of conveyor scales; Z (r) is the difference value of the current output signal of the balance and the signal delayed by the time interval T; ai are the coefficients determined by the formula al 4 G (t) d t. where G (t) is the value of the test load; i summation variable; v, t- integration variables; τ is the time. 2. A device for dynamically calibrating and calibrating conveyor weights, containing a delay element, a first algebraic adder forming a block and a recording device casting so that, in order to improve accuracy, a functional transformation unit and a second algebraic adder are additionally introduced into it, while the first the input of the first algebraic adder is connected to the output of the conveyor scales, and the second input, through the function conversion unit and the forming unit connected in series, to the WTO output th algebraic adder, the first input of which is connected with * output of the first algebraic adder directly and through a second input-delay element, the output of the shaping unit is connected to the recording device.