SU407360A1 - DEVICE FOR ACCOUNTING THE PERFORMANCE OF A SINGLE BUCKET EXCAVATOR - Google Patents

Description

one

The invention relates to the means of automatically controlling, recording and controlling production processes in open pit mining and can be used on all single-bucket excavators, both draglines and mechanical shovels.

A device for recording the performance of a single-bucket excavator is known, which contains analog-discrete transducers, AND diagrams, a scaling circuit, triggers, a logic unit, a reversible counter, and a pulse counter.

In order to improve the reliability of the device, in it the outputs of analog-discrete converters are connected to one of the inputs of the circuits "And, the other inputs of which are connected to the outputs of the flip-flops, and the outputs of all circuits" And are connected respectively to the scaling circuit, reversible counter and pulse counter the output of the scaling circuit is connected to one of the inputs of the first trigger, the second input of which is connected to a logic unit connected directly and through the second trigger to a reversible counter.

The drawing shows a block diagram of the proposed device to account for the performance of single-bucket excavator.

It consists of two analog-discrete converters 1 and 2, circuits “And 3, 4, 5, scaling circuit 6, reversible counter 7, two triggers 8, 9, pulse counter 10 and logical block I.

Logic unit 11, which is a device controlling the sequence of operations of the excavation cycle, rotates the loaded bucket to the unloading site and sends a command for weighing the first trigger 8, which, by going to state "1, with its output, opens the" And 3 and 4 circuits. discrete converter 1, having a voltage t / i at the input, sends pulses with a frequency fi ki L / idt to the countable through the circuit "And 3"

the input of the scaling circuit 6, which, when filled with its output, puts the first trigger 8, the closing circuit “AND 3 and 4, into the state“ O ”. At the same time, the analog-to-digital converter 2, which has a voltage Uz, has an input circuit frequency / 2 2 I to the counting input

about

reversible counter 7. The time conversion of both converters is the same and equal to:

N / 1

(one)

t

30 where yVg is the capacity of the scaling circuit

The number of AV pulses received by the lively counter is equal to;

L

.

/,

or

Ucp, o

N ,. wed o

In other words, the weight of the bucket ladle is directly proportional to the average value over the conversion period (integral evaluation) of the input voltage Usp, the second converter, and inversely proportional to the average value of the input voltage f / cpi of the first converter.

At the moment when the bucket is unloaded, the logic unit 11 generates a signal "reverse to the reversible counter 7, in which the number (yVy-N) is fixed, where N is the capacity of the reversible counter.

When the empty bucket is rotated to the place of digging, the logic unit 11 again commands the weighing to the first trigger 8. The conversion cycle repeats again, as a result of which N pulses go to the reversing counter 7:

 f / cp,

where the number is fixed (N - N + N).

At the end of the second weighing, the logic unit 11 issues a transfer command to the second trigger 9. The trigger 9 opens the AND 4 and 5 circuits, and from converter 2 the reversible counter 7 through the AND 4 circuit is filled with pulses to the full capacity Nj, with its output the drive of the second trigger 9 to the state "O." Schemes "And 4 and 5 are closed. At the same time through the scheme "And 5 in the pulse counter 10 receives the number of pulses:

(/ V,) - (/, - + Л) - - L. (5)

If a measuring signal (f / i const) is applied to the measuring input of the transducer 1.

And on the measuring input of the converter 2, to give sigpal, proportional to the weight of the bucket (), then the pulse counter 10 for each excavation cycle will record the weight

the load in the bucket, and the accuracy of measurement will be very high, firstly, because the integral assessment of the bucket weight is used, which allows to reduce the component yup1, its error due to changes in the entry time Uz,

and, secondly, because the errors of the transducers themselves from temperature changes and the voltage of their power supply are compensated for by the device circuit (Expression 2). For example, an increase in temperature causes an increase in

frequency of both converters.

If the measuring input of the converter 1 to give a signal inversely proportional to the magnetic flux of the lifting engine

fT, k

excavator (1, and on the measuring

the input of the converter 2 to give a signal proportional to the current of its core chain, then the number of pulses fixed in the device will be with high accuracy equal to the weight of the load in the bucket.

Subject invention

A device for measuring the performance of a single-bucket excavator containing analog-to-digital converters, AND diagrams, scaling circuit, triggers, logic block, reversible counter and pulse counter,

characterized in that, in order to increase the reliability of the device, in it the outputs of analog-discrete converters are connected to one of the inputs of the AND circuits, the other inputs of which are connected to the outputs and triggers, and the outputs of all AND circuits are connected respectively to the scaling circuit, reversible counter and pulse counter, the output of the scaling circuit is connected to one of the inputs of the first trigger, the second input of which is connected to a logic unit connected directly and through a second trigger with a reversible counter.