SU1583751A1 - Weight-measuring device - Google Patents

Abstract

The invention relates to weighing technology and can be used in the weighing of goods transported by cranes with the possibility of power from the battery. The invention makes it possible to increase the service life of the balance without replacing the battery by ensuring the minimum consumption of electrical power by automatically turning on and off the power-consuming circuit elements from the power source at the appropriate steps of the balance. The automatic power-up to the analog-to-digital converter (A / D converter) 4 is carried out after the load has been lifted by the signal from the output of the comparator 6, and to the indicator 5 - after the end of the conversion cycle by the signal of the conversion end from the A / D converter 4, which also starts the driver 7 pulses. The indication of the weighing results is provided for the duration of the pulse duration (2-3 s) of the former 7, on the falling edge of which the power from these devices is turned off. 4 il.

Description

(21) 4475765 / 24-10

(22) 08.22.88

(46) 07.08.90. Bul Number 29

(71) Zaporizhia Branch of the All-Union Research and Development Institute Tsvetmetav-Tomato

(72) A.I. Shapiro, A.E.Lipman, A.S.Kukui and O.L. Dubinsky

(53) 681.34 (088.8)

(56) Patent of Germany No. 2923882,

cl. G 01 G 23/42, published 1978

(54) WEIGHT-MEASURING DEVICE

(57) The invention relates to a weighing equipment and can be used in the weighing of goods transported by cranes with the possibility of power supply from a battery. The invention allows to increase the service life of the scales without replacing the battery for

the expense of ensuring the minimum consumption of electric power by automatically turning on and off the energy-intensive elements of the circuit from the power source at the appropriate cycles of operation of the balance. The automatic power-up to the analog-to-digital converter (A / D converter) 4 is performed after the load has been lifted by the signal from the output of the comparator 6, and to the indicator 5 after the conversion cycle by the signal of the conversion end from the A / D converter 4, which also starts the Shaper 7 pulses. The indication of the weighing results is provided for the duration of the pulse duration (2-3 s) of the former 7, on the back front of which the power from these devices is turned off.

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The invention relates to weighing technology and can be used in the weighing of various loads transported by cranes. The purpose of the invention is to increase the reliability of operation by increasing the service life of the power source.

The power distribution of the device elements in time ensures the minimum consumption of electrical energy, which increases the life of the device without replacing the battery and, consequently, increases the reliability of the device.

Lig, 1- shows the block diagram of the mounted crane weighing device; on a cig 2 is a diagram of the operation of the device; in fig. 3 - schematic diagram of the electronic key; on gig 4 - time diagram of his work.

The device contains a measurement unit 1 with a serially connected measuring sensor 2, an amplifier 3 with an initial setup input and an analog-digital converter 4, an indicator 5, a comparator 6, a pulse shaper 7 and a power supply 8, a second electronic switch 9, switching the power to the analog-digital Converter 4 and driver 7, the first electronic switch 10, switching power to the indicator 5, the first output of the analog-digital converter 4 is connected to the indicator 5, and the second - to the input of the driver 7 and the control Key input 10. The driver 7 is connected to the second control inputs of keys 9 and 10. Driver 7 is a single-vibrator that provides for the formation of long pulses with a duration of 2-3 s, sufficient for a person to read the indicator. The power supply 8 at the output is also connected to the power input of the force sensor 2, amplifier 3 and comparator 6.

. An A / D converter (A / D converter) is an integrating A / D converter with intermediate conversion to the time interval and further memorization of the counter by a clock frequency for a given time interval. The output counter is reset and the ADC clock generator is started by the pulse shaping circuit upon power supply. The impulse of the conversion end is formed by the pulse shaping circuit along the trailing edge of the ADC time interval.

The minimum mass corresponding to the threshold of the comparator 6 is determined from the ratio

 rnpa rde rPo mass threshold; Ri „l - the most PPV

shi weighing limit. This ratio arises from the requirement for strain gauge sensors that provide an accuracy category under loads greater than 0.1 RPPs.

The initial loading of the sensors is provided by special devices of preloading and

d weight hooks, chains, etc. The threshold value of the mass RPR is selected experimentally on each weighing device separately when it is applied (manually).

Key 9 is a directly key element (relay), equipped with a control circuit, and consists (Fig. 3) of two Formers

Q pulses of the front and front edges, trigger, transistor amplifier and relay. Key 10 is built and operates similarly.

The device operates as follows C sample.

An electrical signal proportional to the applied force from the output of the sensor 2 is amplified by the amplifier 3 and fed to a 6 0 comparator and an analog-to-digital converter. four.

If no extra effort is applied to the sensor, i.e. there is no load, then the signal at the output of the amplification is 45 l 3 in amplitude less than the specified threshold arriving at the second input of the comparator 6, and at its output there is a zero potential.

In this case, the key 9 is in the off state and, accordingly, the power supply is disconnected from the power source 8 to the driver 7 and the ADC 4. The key 10 is in the initial off state. When the load is lifted, the signal at the input of the comparator 6 becomes greater than the wa-i of this threshold, while the comparator 6 goes into the opposite state, the positive front

55

impulse includes key 9 and supply voltage is applied to A / D converter 4 and driver 7, A / D converter 4 converts the input signal into a digital code and turns on key 10 with a positive front of conversion end. -5 s) Along the negative edge of the pulse from the driver 7, the keys 9 and 10 are turned off.

Claims (1)

Invention Formula A weighing device containing a serially connected force-measuring converter, an amplifier and an analog-digital converter, a first electronic key, an indicator and a power source, an output connected to the input of the first electronic key, power inputs of the load-measuring converter and This is because, in order to increase reliability by increasing the service life of the power source, a comparator is entered into it, one input of which is connected to the input, setting the threshold of the device, another - from the output of the amplifier, and the power input - to the output of the power supply, the second An electric key connected to the output of the power source, and the output to the power input of the analog-digital converter and a pulse shaper connected between the output of the analog-digital converter and one of the control inputs of the first and second e dongles whose other control inputs are connected respectively 20 with the input of the pulse former and the comparator output, the output of the analog-digital converter is connected to the input of the indicator, the power input of which is connected to the output of the first From power source "D1-1 1 C comparator 6 PP / L 1.2 Sforinirabel 7 7 Point 2 3 g