SU1486802A1 - Apparatus for weighing moving objects - Google Patents

Description

The invention allows to improve the accuracy of measurement under the influence of dynamic noise. For this, when the first axis of the object being weighed moves from the track sensors 1, 2, signals 4.5 are sent through elements AND 4.5, switching triggers 6, 7. These signals are fed through a control counter 8 and elements 10 to a five-digit counter 12

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measurement intervals, then through the decoder 13 with thirty-two outputs, the signals are sent to a block of 15 keys, the second inputs of which receive a signal from a ten resistor sensor 3. From the output of block 15, the signals are sent to a large-scale amplifier 16, then to an analog-to-digital converter (ADC) 17 which is switched on sequentially by each signal from the decoder 13. The signals from the output of the A / D converter 17 are fed to adder-divider 18, where they are summed and divided by the measurement time of the axis of the moving object. The resulting value is fed to the display unit 19. Thirty-second signal from the decoder 13 turns off the generator 14 clock pulses and. resets counter 12 to its original position. When passing through track sensors 1, 2 of the second axis of the object, the signal processing cycle of sensor 3 is repeated. 1 il.

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The invention relates to weighing technology and is intended for weighing railway cars in motion. five

The aim of the invention is "improving the accuracy of weighing when changing the speed of movement of the object to be weighed.

The drawing shows a block diagram of the proposed device.

The device consists of a load-receiving platform (GP), track sensors 1 and 2, a strain gauge weight sensor 3, And 4 and 5 elements, KZ-trigger 6 and 7, a control counter 8, a decoder 9, an And 10 element, OR elements 11 , a five-digit counter 12 measurement intervals, a decoder with 32 outputs 13, a generator 20 of 14 clock pulses, a block of 15 keys of signals, a large-scale amplifier 16 with a block of weight resistors at its input, an analog-digital converter 17, an adder-divider 18 25

and display devices 19.

The device works as follows.

KZ-triggers 6 and 7 and counters 8 and 12 are set in the initial state 30. When hitting the first axis of the trolley triggered track sensor 1, through. element I 4 to the 8-input of trigger 6 receives a signal, since the first input of element I 4 has a destructive signal from the inverse output K.8 of the trigger 7. Κ, δ-flip-flop 6 is set to one state. Through the element I 5, impulses 40 start to flow to the input of the control counter "8" until track sensor 2 is triggered. When track sensor 2 is triggered, trigger-type trigger 7 is set to "1" and turns the short-circuit trigger 6 into the zero state. Element I 5 closes at 45. For example, the speed is 3 km / h. The maximum number of pulses arriving at the input of counter 8 is 8, i.e. the measurement time is set to 1 s. equal to .0.125 s. If the speed is greater than 3 km / h, then at the input of the counter 8 fewer pulses will arrive, which means that the time for measuring the $$ weight will be less.

Let, for example, in the counter 8 the binary number 110 be fixed. This corresponds to a measurement time of 0.75 s.

In this case, the control signal will appear at the output 6 of the decoder 9. Therefore, after the trip sensor 2 has been triggered, the generator 14 of the clock pulses out the frequency at a rate of 32 intervals for the measurement time of 0.75 s, for which one of the inputs of the 1SG element connected to the output 6 of the decoder 9, 14 clock pulses are connected to the corresponding output of the generator. The pulses of this frequency through the specified element And 10 and then through the element OR 11 is fed to the input of a five-digit counter 12, which is filled with pulses starting from 1 to 32, since its maximum capacity is equal to 32.

A decoder with 32 outputs sequentially turns on the keys 15, through which the input of the scale amplifier 16 receives a signal from a strain gauge weight sensor 3 multiplied by a weight function with coefficients set using resistors K - K / according to the type of weight function specified.

From the output of the scale amplifier, the signal is fed to an analog-to-digital converter, which is connected in series to the samples by each signal from the decoder 13,;. Ranging from 1 to 32. ·

In the form of a binary code from the ADC output, the signal arrives at the processing in adder-divider 18. B-summatrix is the summation of binary codes obtained when converting an analog signal into a code at each measuring section. The resulting amount is divided by the measurement time of the axis of the moving object and multiplied by the conversion coefficient of the weight sensor. The resulting ’value in the form of a binary code is fed to the display unit 19, which in the decimal number system identifies the result of the weighting of a moving object.

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The thirty-second signal at the output of the decoder 13 turns off the generator 14 and resets the counter 12 on the K-input to its original state.

When passing through travel

sensors 1 and 2 of the second bogie axis,

reviewed signal processing cycle

Weight sensor repeats. At different speeds realized

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multiplication by a symmetric weight function.

After measuring the weight of all axes of the composition, the entire circuit returns to its original state.

Claims (2)

Claim Device for weighing moving objects, containing a load-receiving 'platform with a strain sensor, weight sensor, control counter, first AND element, OR element, decoder, large-scale amplifier, key unit, weight resistor unit, display unit, clock generator, connected to the first input of the first element AND , analog-to-digital converter, I deny, stating that, in order to improve the weighing accuracy, two short-circuits, nine elements AND, a five-digit binary counter of measurement intervals, five are entered into it, I-input decoder with thirty two outputs, an adder-divider, two track sensors, the output of the first track sensor connected to one of the inputs of the first element And, to the other input of which is connected IN-С the output of the first short-circuit trigger, the output of the second element And connected to 3-input of the second KZ-flip-flop, to which Kvodho is connected direct output, the course of the first KZ-flip-flop, direct output of the second KZ-flip-flop is connected to the first input of the second element And, the second input of which is connected to the clock generator, Connected to the input of the control counter, the output of the second _5- track sensor is connected to the 3rd input of the first short-circuit trigger and the trigger start input of the clock generator, the outputs of the control counter are connected to the input of the decoder, each of 10 eight inputs of which are connected respectively to the first input of one of the eight And elements, to the second inputs of which the corresponding outputs of the clock generator are connected ^ 15 outputs of these elements AND are connected to the inputs of the OR element, the output of which is connected to the counting input of a five-digit binary counter of measurement intervals, the outputs of which are connected 20 with the inputs of the five-input decoder, the outputs of which are connected to the corresponding inputs of the key block, to the second inputs of which the output of the strain gauge weight sensor is connected, The 2θ outputs of the key block are connected to the inputs of the weight resistors block, the outputs of which are connected to the input of a large-scale amplifier whose output is. connected to analog-digital input 30 of the converter, to the start control inputs of which the outputs of the five-input decoder are connected, the thirty-second output of which is connected to the control input of the sync pulse generator, the information and control outputs of the analog-digital converter through an adder-divider connected to the input of the display unit.