SU838396A2 - Weight measuring device - Google Patents

Description

(54) WEIGHT-MEASURING DEVICE

no packaging. To determine the presence of containers, additional devices are needed, the reliability of which is lower than the reliability of the elements used in the weighing device, or they are rather complicated.

 The purpose of the invention is to expand the scope of the weighing device, increasing its accuracy and reliability.

This goal is achieved by introducing a counter, two two-input circuits AND and a former into the weighing device, one of the inputs of the former and one input of the first AND circuit connected to the output of the comparison node, the second input of the first AND circuit, the counter input and one of the second inputs The connectors AND are connected to the output of the reversible counter, the second input of the second circuit AND is connected to. the first input of the counter, the second output of which is connected with the second input of the driver, and the output of the first circuit AND of the driver and connected to the input of the control unit, while the output of the second circuit And connected to the input of the first n-bit pulse counter. ,

The additionally entered counter is designed to determine the moment of loading of strain gauges with a mass whose evening exceeds a specified value, and the resolution setting of this value corresponds to half of the volume of the reversible counter, and the minimum value of this value is equal to the volume of the reversible counter, as well as to form the exposure after loading the devices. be any and determined by the volume of the counter. Discreteness of the exposure time corresponds to the filling time of half the volume of the reversing one from 1 detector. The shaper determines the moment from which the measurement result is reliable and generates a signal to turn on the measurement mode. At the same time, the following analog-to-digital converter processes the change in the signal of the strain gauges caused by the loading of the device, and the oscillations do not exceed a predetermined value.

The cervical circuit also generates a signal. The measurement mode is switched off at a load, during additional loading or unloading of the device, if the following analog-digital converter leaves the monitoring mode of the signal change from the load cells.

The second And scheme performs the key role and, together with the counter, participates in the formation of the length of time of the buckle.

The drawing shows the block diagram of the weighing device.

The weighing device contains load cells 1, analog-digital converter 2, consisting of comparison node 3, code-voltage converter 4, pulse generator 5 and reversible counter b, code correspondence 7, control block 8, adder 9, registering device 10, additional n-bit converters 11 code-voltage, n-bit counters 12 pulses, a driver 13, two AND circuits for two inputs — 14 (second) and 15 (first), and counter 16.

The device works as follows.

In the initial state, the strain gauges 1 are not loaded and the weighing device is prepared for operation with a signal Turning off the measurement mode. In this case, the next analog-digital converter 2 performs the signal from the output of strain gauges 1, but. scheme. 7, the census is turned off and the signals from the output of the adder 9 are not fed to the input of the registering device 10. The recording signal from the first output of counter 16 is fed to the input of the second circuit 14 and the inhibiting signal from the first output of counter 16 is fed to the second input of the imager 13.

When loading strain gages of 1 m. Mass, the value of which exceeds the specified value (lower limit of measurement), the next analog-to-digital converter performs the signal change caused by the change in mass. At the output of the reversing counter 6, the addition pulses are formed, which, through the circuit 14, arrive at the inputs of the registering device 10, n-bit counters 12 pulses and the input of the counter 16, which ensures compensation of the signal from the strain gauges 1. When the counter 16 arrives at a certain number pulses at the first output of its prohibitory signal, which closes the circuit And 14. Subsequent pulses from the output of the reversible counter 6 do not pass through the circuit 14, but arrive at the input of the counter 16.

Claims (1)

At the time of receipt of a given number of pulses at the first and second outputs of the counter 16, the enabling signals are formed, which are fed to the input of the circuit 14 and the former 13. By this time, the transient at the output of the sensors 1, caused by a change in mass, fades to a predetermined level. At the moment when the analog-to-digital converter compresses the QPeT signal from the strain gauges 1, the addition and subtraction pulses begin to come from the comparison node 3 (until this moment only the addition pulses were received from its output. The imaging unit 13 detects this link 2 and generates a Turn on measurement mode signal that is fed to the input of control unit 8. The control block 8 includes a search message 7 and the average measurement result from the adder 9 delivers from to the input of the recording device In case the loading mass is less than the specified value, then the counter 16 does not issue a permit signal to the second input of the driver and therefore no signal will be generated Switching on the measurement mode With a measured mass from the strain gauges 1 from the output of the comparison node 3 and from the output reversible counter 6, the subtraction pulses arrive at the input of the circuit AND 15. In this case, the circuit 15 generates a signal Turning off the measurement mode, sets the device to its initial state through control unit 8. The “Off” signal of the measurement mode is also formed in those cases when the amplitude of oscillations exceeds the permissible value. In these cases, the measurement result enters the recording device 10 after a time delay, which increases the reliability of the measurement results. The device allows to expand its area of application, since it can operate in automatic and semi-automatic modes, it can control the presence of the container when used in metering devices. This increases the reliability of the device compared to known devices. In addition, the reliability of the measurement results is improved, i.e. Accuracy, since measurement is performed only if the conditions are met that allow to obtain the correct measurement result. The invention of the weighing device according to ed.St. No. 608061, characterized in that, in order to expand its field of application, to increase accuracy and reliability, a counter, two two-input circuits AND, and a former are entered into it, one of the inputs of the former and one input of the first AND circuit connected to the output of the comparison node, the second input of the first circuit And, the counter input and one of the inputs of the second circuit And connected to the output of the reversible counter, the second input of the circuit And connected to the first input of the counter, the second output of which is connected to the second input of the imaging device, and the output of the first circuit I. and the output form L inputs are connected to the control unit, the output of the second AND gate is coupled to the input of the first n-bit pulse counter. Sources of information taken into account during experimentation 1. USSR author's certificate .608061, cl. G 01 G 23/36, 1976.