SU1704028A2 - Grain granulation grading control device - Google Patents

Abstract

The invention is intended to determine the uniformity parameter of ground grain. The aim of the invention is to increase the information content of determining the parameters of the crushed grain by controlling the uniformity of the obtained product and using these parameters to control the grinding process. Grain particles affect the measuring device, which has sensitive elements, log amplifiers, divider, multipliers, exponentiation unit, anti-log converter, control unit, memory blocks, multipliers, adders, subtractors, quad squaring block, squaring unit, quad multipliers, square-root extraction unit, indicators. 1 il.

Description

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WITH

The invention relates to the field of measurement technology, is intended to measure the particle size distribution of bulk materials, such as grain, can be used in the feed, milling and other industries and is an improvement of the known device according to the author. St. No. 1536271.

The purpose of the invention is to increase the information content of determining the parameters of the crushed grain by controlling the uniformity of the obtained product and using these parameters to control the grinding process.

The drawing shows a functional diagram of the device.

The device contains a measuring device 1, having sensitive elements 2 and 3, logarithmic amplifiers 4-6, divider 7. multipliers 8 and 9. raising unit 10, anti-log converter 11. block 12 of control, blocks 13-16 PRMKTI. multipliers 17-20, adders 21-23, inhabitants 24-28. quad block erection unit 29, block erection block 30 square, quad multipliers 31 and 32. square root extraction box 32, indicators 34-35.

Measuring device 1 connected to sensing elements 2 and 3 is electrically connected to logarithmic amplifiers 4 and 5. They are connected to divider 7, the output of which is connected to the input of logarithmic amplifier b. Its output through multiplier 8 is connected to the first input of the raising unit 10, and its output is connected to the first input of multiplier 9. The second input of multiplier is connected to logarithmic amplifiers 5, and the output of multiplier 9 is connected to anti-logarithmic converter 11, the output of which is connected to the first inputs of blocks 13-16

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memory, the second inputs of which are connected to the control unit 12. Its second output is connected to power exponent 10. The outputs of memory blocks 13-15 are connected to the inputs of multipliers 17-20, the outputs of which are connected to the outputs of the adder 21. The output of the adder 21 is connected to the inputs of the subtractors 24-27, and their outputs to the inputs of the quadruple block 29 of the squaring, the outputs of which are connected with the first inputs of the quad multiplier 31, the second inputs of which receive signals from the outputs of the 13-16 memory blocks. The inputs of the adder 22 are connected to the outputs of the quad multiplier 31. The outputs of memory blocks 13-16 are fed to the first inputs of the quad multiplier 32, the second inputs of which are connected to the outputs of the subtractors 24-27. The outputs of the quad multiplier 32 are connected to the inputs of the adder 23, the output of which is connected to the second input of the subtractor 28, the first input of which is connected to the output of the adder 22. The output of the subtractor 28 is connected to the input of the square root extraction unit 33. The results of the operations are displayed on the indicator 34 from the block 33 and on the indicator 35 from the adder 21.

The device works as follows.

The flow of crushed grain on the sensing elements 2 and 3 of the measuring device is divided into gatherings and passages. Particles from the surfaces of sensitive elements 2 and 3 produce signals in measuring device 1, the signals from which are fed to logarithmic amplifiers A and 5, where they are amplified and logarithmized: the output signals of amplifiers 4 and 5 are fed to divider 7, where one signal is -t: - and the other. The signal from the divider 7 in the logarithmic amplifier 6 is logarithmed and enters the multiplier P, and then to erg LV °:,., Unit 10 is built into the power to the second input of which a signal is supplied from the unit 12 / board. In block 10, an elevation operation E is effected, the degree of the signal removed from control block 12. The second input of the multiplier .9 is supplied with a signal from the logarithmic amplifier 5; the product of the signals is fed from the multiplier 9 to the actilogic converter 11, the advantageous signal of which is the number of particles in the stream with a size equivalent to the signal

control unit 12, for example:

- t d

R e

where R is the number of particles with sizes greater than d:

d - diameter of controlled particles;

m, n are the distribution parameters (determined by blocks 4-8).

Then, the signal from the anti-log converter 11 is supplied to the memory blocks 1316, to the second inputs of which signals are received to turn on one or another memory block from the control block 12. The algorithm works.

The control unit 12 supplies a signal equivalent to a particle diameter of 0.5 mm; According to the pre-calculated parameters m, n, in the exponentiation unit 10, the multiplier 9 and the anti-log converter, the RO.S is determined. those.

the number of particles with a size greater than 0.5 mm (or as they are called - the residue is greater than 0.5 mm). Then, according to the signal of the control unit 12, this RO.S value is stored in the memory block 13. Similarly, the calculation and storage of the values of the residuals RI.S,

R2.5. R3.5 The signals from the outputs of memory blocks 13–16 are fed to multipliers 17–20, where the operation is performed by multiplying by constant coefficients: in multiplier 17, by an amount proportional to the particle diameter of 0.5 mm; in the multiplier 18 - 1.5 mm, in the multiplier 19 - 2.5 mm, in the multiplier 20 - 3.5 mm.

In the adder 21, the previously received sig-. The bales are summed up and as a result, the value obtained characterizes the grain grinding module:

d Ro, 5-0.5 + Ri.5 1.5 + R2.5J2.5 + Pz.5 3.5. Then the signal value d is applied to the inputs of the subtractors 24-27, in the coders there is a subtraction from the value d of the constant coefficients proportional to the particle sizes: d 0.5 mm in the subtractor 24: d 1.5 mm in the subtractor 25; d 2.5 mm in the subtractor 26, d 3,5 in the subtractor 27; thereafter, in quad squaring block 29, a squaring operation occurs, e.g.

(d-do.sf.

The output signal from block 29 is sent to a quad multiplier 31, the other inputs of which receive signals from the outputs of memory blocks 13-16, for example

Ro, 5 (.5j2.

and the sum of the signals comes from the output of the adder 22 to the input of the subtractor 28. From the blocks 13-16 of memory and from the subtractors 24-27, the signals are fed to the inputs of the quad multiplier 32. and then the products of the signals are summed in the adder 23, the output of which is block 30 is squared into

Rj.5 (d-dn.5) + Ri.5 (.5) R2.5 (d-d2.s) + R3.5 (d-d3.5) f

and enters subtractor 28, where the operation of subtracting the signal of block 30 of squaring from the signal of adder 22 occurs. The result obtained in block 33 is subjected to square root extraction. The output of block 33 is the value of the standard deviation or uniformity parameter, the result of which is displayed on the indicator

34. The value of the grinding module (average particle diameter) is displayed on the indicator

35

Claims (1)

Based on indications of indicators 34 and 35, the grain grinding process is simplified, since indications of indicator 35 characterize the average particle size, the value of which is kept constant during the grinding process, and according to indications of indicator 34, they try to choose a grinding mode so that kinship remained constant, since the smaller its size, the smaller the particle size dispersion, i.e. the more uniform is the mixture of ground grain in particle size. On the contrary, a larger value of the uniformity parameter corresponds to uneven grinding of the product, i.e. overgrinding in the fines fraction and non-crushing in the coarse, which leads to unnecessary costs for separation, removal and re-grinding. The invention The device for controlling the particle size distribution of the crushed grain according to ed. St. No. 1536271, characterized in that, in order to increase the informativity of determining the parameters of the crushed grain by controlling the homogeneity of the obtained product and using these parameters to control the grinding process, it additionally contains memory blocks, a multiplier, adders, square meters, a square root extraction unit, with the inputs of the memory blocks connected to the input of an anti-log converter, and the outputs of the memory blocks connected to the inputs of the multipliers whose outputs are connected to the accumulator moves, the output of the adder is connected to the inputs of the subtractors, and their outputs to the inputs of the quad squaring block, whose outputs are connected to the first inputs of the quad multiplier, the second inputs of which receive signals from the outputs of the memory blocks, the inputs of the adder are connected to the outputs of the quad multiplier, the outputs of the memory blocks arrive at the first inputs of the quad multiplier, the second inputs of which are connected to the outputs of the subtractors, the outputs of the counted-true multiplier are connected to the inputs of the adder, the output of which It is connected to a squaring unit, the output of which is connected to the second input of the subtractor, the first input of which is connected to the output of the adder, the output of the subtractor is connected to the input of the square root extraction unit.