SU1726993A1 - Conveyor-belt weigher - Google Patents

Abstract

The invention relates to weighing technology and allows for improved accuracy. The signal of load sensor 4 after correction in block 9 of the transfer function, taking into account the type of load receptor 3 in multiplier 13, is multiplied with the signal of speed sensor 5. This signal in block 15 is corrected depending on the magnitude of the dynamic error. For this, the signal from position sensor 6 is fed to an amplitude detector 7, where it is detected, which determines the amplitude of movement of the load-receiving mechanism 3. At the same time, the sensor signal is detected in the frequency detector 8, the output of which oscillates the frequency of the load-receiving mechanism 3. The signals from the outputs detectors 7 and 8 are multiplied in multiplier 10, the output signal of which in turn is multiplied in multiplier 11 with the output signal of detector 8. The output signal of multiplier 10 in multiplier 12 is multiplied with output nym signal unit 9 and summed in adder 14. 1 il.SO

Description

This invention relates to a weight measuring technique.

The purpose of the invention is to increase precisely. STI,

The drawing shows a structural diagram of the scales.

Conveyor scales contain belt conveyor 1 with drive 2, load receiving mechanism 3 with load sensor 4, speed sensor 5, position sensor 6, amplitude detector 7, frequency detector 8, transfer function block 9, first 10, second 11, third 12, fourth 13 multipliers, adder 14, correction block 15 and integrator 16.

la and produces a signal proportional to this load, which is fed to the input of block 9 of the transfer function.

Block 9 generates a signal based on the type of specifically used load-carrying mechanism 3 (built-in roller carrier or platform). The output signal of block 9 and the signal of sensor 5 are multiplied by multiplier 13, at the output of which f i ipcc a signal of instantaneous weight performance, fed to one of the inputs of block 15, which performs correction depending on the value of dynamic error.

accurate conveyor 1 of a rotary excavator (not shown),

The correction of the indications of the conveyor scales depending on the values of the dynamic error is carried out as follows. The calculated formula for the dynamic error of the belt scales when installed on a rotary excavator of a known type, due to oscillations of the conveyor, can generally be expressed as

(Q (W (Q)) + bQ, where (Zdin is the dynamic error;

b is the magnitude of displacement (amplitude); W-transfer function of the weighing device of the belt scales;

Q is the frequency of oscillation of the load receptor.

The electrical signal from sensor 6 is fed to the input of the amplitude detector 7, where it is detected, i.e. the magnitude of the displacement (amplitude) of the load-carrying mechanism 3 is allocated, and the input of the frequency detector 8, where it is also detected, but the oscillation frequency of the load-receiving device is allocated. The electrical signals from the frequency detector 8 and block 9 are fed to the input of multiplier 10, where their values are multiplied. The output electrical signal from the multiplier 10 (b Q) simultaneously with the electrical signal of the frequency detector 8 is fed to the input of the multiplier 11,

the output of which (b fl) corresponds to the acceleration of the loading boom (b fir). At the same time, the output electrical signal from the multiplier 10 (b Q) is fed to the input of the multiplier 12, the second input of which receives the electrical signal from the block 9 of the transfer function. After

multiplying the received signal at the same time the signal from multiplier 1 is fed to the input of the adder 14, where they are summed and the output value corresponding to the magnitude of the dynamic error is fed to the input of the correction unit 15. In accordance with the values of this incoming signal, in block 15, the main signal received from multiplier 13 is corrected.

Claims (1)

Claim scales for a rotor excavator containing a load-receiving mechanism with a load cell, a speed sensor, a first multiplier and an integrator, characterized in that, in order to improve accuracy, a position sensor, amplitude and frequency detectors, second, third and fourth multipliers are introduced , the transfer function block, the adder and the correction block, the position sensor is connected to the amplitude and frequency detector inputs, the output of the amplitude detector is connected to one input of the first multiply l, and the output of the frequency detector to another input of the first multiplier and one input of the second multiplier, the output of the first multiplier is connected to another input of the second multiplier and one input of the third multiplier, the load cell is connected to another input of the third multiplier and one input of the fourth multiplier, The speed sensor is connected to another input, the outputs of the second and third factors are connected to the inputs of the adder, the output of which is connected to one, and the output of the fourth multiplier is connected to another at the input of the correction unit, the output of which is connected to the input of the integrator.