SU1594378A1 - Apparatus for determining plastometric indices of coals - Google Patents

Abstract

The invention can be applied in the coke and coal industry. The purpose of the invention is to improve the accuracy and reliability due to auto-zero memory block. The zero-drift correction of the memory block storing the previous measurement information is performed by a circuit having a quantization step at a level less than the quantization step of the measuring circuit. Correction can be carried out at any point in the operating range, either downward or downward, a signal corresponding to zero. As a result of periodic correction, the drift of zero decreases, which allows to reduce the level of quantization in the measurement process and to improve the measurement accuracy and reliability of the device in operation. 1 il.

Description

The invention relates to devices that determine the plastometric parameters of coal, and can be applied in the coke and coal industry.

The purpose of the invention is to increase accuracy and reliability by auto-correcting the zero of the memory block.

The drawing shows a diagram of the device.

The device contains a plastometric cup 1 with a stamp 2, a room in an electric furnace 3, a lever 4 with a load 5, which interacts with a stamp 2, a knot 6 punctures with a plastometric needle 7 and a drive 8, a recording device 9, which interacts with a lever 4 , block 10 of memory.

The first electronic switch 11 connecting the input of the memory unit 10 and the output of the registering device 9, the control unit 12, the output of which is connected to the puncture assembly 6, four adders 13-16, the first inputs of which are connected to the output of memory 10, four comparators 17-20, the first inputs of which are connected to the outputs of the adders, the source circuit 21-24, the reference voltages connected to the second inputs of the comparators, the trigger 25, the first input of which is connected to the output of the first comparator 21, and the second through the first inverter 26 with the output the second comparator 22, first NAND gate NAND 27, the two inputs are connected to the inputs .kotorogo triggeSP

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25, and the third with the second output — control unit 12 — three one-shot 28-30, the first one-shot 2B on which connects the output of an AND-NE logic element 27 to the control input of the first electronic key 11, and the second T-retium connects direct and inverse trigger triggers 25 with inputs of control unit 12, successively connected pulse generator 31, second electric key 32, reversible pulse counter 33 and digital-analog converter 34, the output of which is connected to the control of the auxiliary input of the memory unit ti and second logical element -NOT 35, the first input of which soedinen- inertia through insulating member 36 to the control input of the first electronic key, the second - with output of the third comparator 19, a third gate, - through the second

 inverter 37 with the output of the fourth comparator 20, and the output with the control input of the second electronic key js

32.

The device works as follows.

The recording device 9 records the vertical movements of the lever 4 (the plastometric curve). With a horizontal flow of the plastometric curve, the current value of the signals at the output of the recording device is equal to the memorized value at the output of the memory block 10, and the difference between the signals at the outputs of the adders 13 and 14 is zero. The first 21 and second 22 sources of the reference voltage are configured in such a way that the output of the first comparator 17 is logical 1, and the output of the second comparator 18 is logical O, which is inverted. the first inverter 26, and on both - the inputs of the trigger 25, as well as on both inputs of the first logic element

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 AND-NOT 27 there are logical G, trigger 25 is in the initial state, and at the outputs of the second 29 and the third 30 one-shot are logical O.

When changing the horizontal section by lifting, the current value of the signal at the inputs of the first 13 and second 14 maters becomes more memorized, and at their outputs appears; signal difference. When this difference exceeds the value of the reference voltage 50

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Neither the second source 22, the second comparator 18 is triggered, and at its output a logical 1 appears, which is inverted by the first inverter 26, and a logical O causes the trigger 25 to a different steady state. A positive voltage drop at the input of the third one-shot 30 triggers it, a pulse is generated at the output, which is fed to the input of the control unit 12 as a command to permit plastic puncture; lay Logic O from the output of the inverter 26 is also fed to the input of the first logic element AND-HE 27, the output of which appears as logical 1, the positive voltage drop triggers the first one-oscillator 28, a pulse is generated at its output, which opens the first electronic key 11 and a new signal value is supplied to the input of the memory unit 10, which is stored. The current and memorized values of the signals at the inputs of the adders 13 and 14 become equal, the signal at the outputs of the strokes of the adders 13 and 14 disappears, the comparator 18 returns to its original state, and the trigger 25 remains in the same state. This completes the level quantization cycle.

Upon further elevation of the plastometric curve, comparator 18 is triggered again, but trigger 2 remains in the previous state. When the plastometric curve declines, the first comparator 17 is triggered, the trigger 25 switches to the opposite state, and a pulse is generated at the output of the second one-shot 29, which arrives at the control unit 12 as a command to perform the search for the upper boundary of the plastic layer.

Thus, the device performs the signal quantization by level, and at the moments of extremes it forms single pulses. The quantization step when lifting is equal to the value of the reference voltage of the second source 22, and when falling down - the value of the reference voltage of the first source 21. Adders 15 and 16, sources 23 and 24 of the reference voltage, comparators 19 and 20, inverter 37 are interconnected similarly to adders 13 and 14, sources 21 and 22, comparators 17 and 18 and inverter 26 and

intended for drift zero correction. The reference voltages of sources .23 and 24 are somewhat less than the voltages of sources 21 and 22. Comparators 19 and 20 react to lower values. deviations of the current signal from the memorized, i.e. their dead zone is smaller than that of comparators 17 and 18.

The second electronic key 32 closes if at least one of the control inputs of the second logic element IS-NOT 35 has a logical O, i.e. one of the comparators 19 or 20 worked, and at the gate input - the enabling signal from the inertial link 36.

Due to the inertial link, the signal to the gate input of the second logical element AND-NOT 35 arrives with a delay, i.e. at the moment when the memory unit 10 has already memorized the new signal value. The difference between the current and memorized signals at this moment is the actual zero drift of the memory device. If the drift value exceeds the sensitivity threshold of the comparators 19 and 20, then one of the comparators is triggered, and the second electronic switch 32 is closed. The counter 33 starts to receive pulses from the generator 31. The direction of the counting is determined by which of the control inputs have a logical forward counting (+) or a counting down counting (-). Let, for example, the voltage of the memory device decrease as a result of the drift. Then the comparator works.

19, a logical O appears at its output, which switches the counter 33 to a forward count. The counter 33 sums the generator pulses, as a result, its content is increased. The voltage of the digital-to-analog converter 34 is directly proportional to the contents of the counter. The zero of the memory unit is shifted upwards. The voltage difference at the outputs of the adders becomes zero, and the comparator 19 is turned off. The key 32 is opened, the pulse counting stops, the counter 33 stores its contents — without changes until the next key closure.

If at the next key closure 11, the drift zero does not exceed the sensitivity threshold of the comparators 19 or

20, the key 32 does not close, and the counter 33 does not change its state.

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If the voltage of the memory unit 10 as a result of the drift increases, then the comparator 20 is triggered and a logical 1 occurs at its output, which after the inventory controller 37 arrives at the countdown input. (-) counter 33 already as a logical O. switches to the reverse account. The pulses of the generator 31 are subtracted from the contents of the counter, and the voltage of the digital-analog converter 34 is reduced. The zero of memory unit 10 is shifted downward. The voltage difference at the outputs of the totalizers becomes zero, and the comparator-20 turns off.

Thus, the device determines the sign of the zero drift and, by changing the contents of the reversible counter, shifts the zero in the opposite direction until full compensation. This process is combined with the process of quantizing the input signal.

Sintering coals, for the analysis of which the device is intended, change these plastometric indicators within fairly wide limits. In particular, some of the coals give a plastic shrinkage close to zero. The plastometric curve of such coals is an almost horizontal line, and the speed of lowering the lever becomes comparable with the speed of the drift zero. Between punctures, the signal does not have time to change so much that comparators 19 and 20 feel it. At the same time, drift zero can trigger the comparators 17 and 18, which is perceived as changing the sign of the derivative, and control unit 12 performs a false puncture. In order to avoid this, the key 11 must be closed before the zero goes out of the working area. To this end, the second output of the control unit 12 is connected to the third input of the first AND-NE logic element 27. At the same time as the drive of the needle drive 7 is forced, the key 11 closes and block 10 stores the new signal value.

For normal operation of the proposed device, the reference voltage of the sources 23 and 24 is less than the quantization step, and the delay time of the link 36 is longer than the duration of the transient process in the memory block .10. Masking the correction signal and pre-setting the zero is performed in block 10 of the memory;

Formula of the invention

A device for determining plastometric indicators of coal containing a plastometric cup with a stamp placed in an electric furnace, a puncture assembly with a plastometric needle and a drive, a puncture assembly drive control unit, a registering device, a memory block, the first electronic key connecting the memory block input and the output of the registering device, two adders, the first inputs of which are connected to the output of the memory unit, and the second with the output of the registering device, two comparators, the first inputs of which are connected to the outputs of the sums two sources of the reference voltage connected to the second inputs of the comparators, the trigger, the first input of which is connected to the output of the first comparator, and the second through the inverter to the output of the second comparator, the first logical element AND-NOT, the two inputs of which are connected to the trigger inputs , and the third with the second output of the control unit, three one-shot, the first of which

connects the output of the NAND logic element to the control input of the electronic key, and the second and third outputs of the trigger - to the inputs of the control unit - characterized in that, in order to improve accuracy and reliability, it is equipped with the third and fourth adders, the first inputs of which are

connected to the output of the memory unit, and the second to the output of the registering device, the third and fourth comparators, the first inputs of which are connected to the outputs of the corresponding summers, the third and fourth sources of the reference voltage, connected to the second inputs of the corresponding comparators, successively connected by a pulse generator, a second electronic key, a reversible pulse counter and a digital-to-analog converter, the output of which is connected to the control input of the memory unit, and a second logic element volume

5 I-NOT, the first input of which is connected via an inertial link with the control input of the first electronic key, the second with the output of the third comparator, the third through the second inverter with the output of the fourth comparator, and the output with the control input of the second electronic key .

Claims (1)

Claim An apparatus for determining plastometricheskih 'indicators coals containing plastometrichesky glass with a stamp placed in an electric furnace,, θ punctures node plastometer _Iche tion needle and the actuator drive control unit assembly punctures the recording device, a memory, a first electronic switch connecting the input of the storage unit ¹ and the output of the recording device, two adder, first inputs of which are connected to the output of the storage unit, and the latter - with output recording device, two comparators, the first inputs 20 which are connected to outputs sous mators, two sources of reference voltage connected to the second inputs of the comparators, trigger ger, the first input of which is connected 25 to the output of the first comparator, and the second through the Inverter - with the output of the second comparator, the first logic element Y-NOT, whose two inputs are connected to the trigger inputs , and the third with the second output of the control unit, three one-shot, the first of which connects the output of the logical element N-NOT to the control input of the electronic key, and the second and third outputs of the trigger - to the inputs of the control unit · characterized in that, in order to improve accuracy and reliability, it is equipped with the third and fourth adders, the first inputs of which are connected to the output memory block, and the second - with the output of the registering device, the third and fourth kompa'ratory, the first inputs of which are connected to the outputs of the corresponding adders, the third and fourth sources of reference voltage connected to the second input I will give the corresponding 'comparators connected in series by a pulse generator, a second electronic key, a reversible pulse counter and a digital-to-analog converter, the output of which is connected to the control input of the memory unit, and the second logic element J-NOT, the first input of which is connected via an inertial link to the control input of the first electronic key, the second - with the output of the third comparator, the third through the second inverter - with the output of the fourth comparator, and the output - with the control input of the second electronic lucha 1594378