SU1399717A1 - Apparatus for controlling humidity of loose material - Google Patents

Abstract

The invention relates to a technique for automating technological processes for the production and processing of bulk materials and can be used in the process of automating the preparation of grain for grinding. The purpose of the invention is to improve the accuracy of the device. The device contains a sensor for water flow, bulk material and humidity, respectively, a water flow controller 7, a humidity control unit 13, an operating mechanism 8. Filters 4, 5, 6 are additionally introduced into the device in order to increase the control accuracy, blocks of diagnostics 9-11, 14 sensors for water flow, bulk material, humidity and water flow regulator, respectively, as well as computing unit 12. 1 sludge. Sipichsh twmfpuaa with (6 (L with

Description

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The invention relates to the automation of technological processes of production and processing of bulk materials and can be used to automate the process of preparing grain for grinding.

The aim of the invention is to increase the accuracy of the device.

The drawing shows the scheme of the Proposed device.

The device consists of a sensor 1 1 water flow, sensor 2 flow of raw material, sensor 3 humid Chi, filters A-6, water flow regulator 7, actuator (regulator) 8, blocks 9-1 Diagnostics of water flow sensors , 4 of the bulk material and humidity, respectively, of the computing unit 12, the humidity adatist 13 and the diagnostics control unit 14 of the water flow controller. In addition, the diagram shows the technological apparatus 15, in which the material is humidified.

The proposed device is implemented on the basis of domestic mass-produced technical means. Narymer, water flow sensor 1, device type I IP.T, grain flow sensor 2 - device RVD-71, flag sensor 3 - device PVZ-20D. Filters D-6, diagnostics blocks 9-11 and 14, computing unit 12, preset-4ik 13 and controller 7 are implemented on the basis of the microcomputer Electronics-60.

The device works as follows: jba3OM.

I All signals Q ,. and Q, j from sensors 1-3 are received at discrete points in time (i 0,1,2,3. ,,) at the inputs of their filters 4-6 for suppressing EHF noise (increasing the accuracy of flow and humidity measurement) implementing the following algorithms

 Q ,, 4, +. (QI; -Q,; -,); five.; Q2 -, - i + oi. (-Q,;.,); WITH; C ;., + ni, (Ci –C;.,).

Here, oij (j 1,2,3) is the filter setting parameter, which, depending on the interference level, can be changed in the Limits 05 odj 6 1, with large interference within 0, 1; Q ;; Q , WITH; - filtered parameter values at time; Q ;; , , WITH; - measured by sensors 1-3 parameter values in the L-th time point,

5 0 5

0 5

0

five

0

five

Such filters are called exponential. These are discrete aperiodic links. They are technically simple. When implemented on a computer, a small amount of memory is required. Filtered QI signal values; Qii C, - go to the inputs of blocks 9-11 diagnostics of the operation of sensors 1-3, respectively. They are designed to assess the correct operation of the sensors and signaling their failure. In these blocks, the filtered values of the signals are compared with the predetermined limit values. If a

a, q ,; &but;

 Qz;

a,: C; but ,

It is believed that the sensors are working normally and the Q signals are formed at the output of blocks 9-11. and C; respectively.

If, for example, signal Q; went beyond the lower limit (Q ,; a,) or the upper limit (0 ,; a), then the output of block 9 produces two signals: one equal to the corresponding limit (lower a, or upper a), another type of closed contact to close the circuit For example, a warning light.

For an object assessment of the operation of chicks 1–3, the limiting values of aj and a should be chosen for each specific object so that all possible variations of the technological regime do not go beyond these limits.

Computing unit 12 determines the amount of moisture in the material according to the formula

fi, - Q ,; WITH,

3

and Q task; a water flow controller 7 to obtain a predetermined humidity S; master 13

about . , 1 - S, This formula is derived from the material balance equation

(Q; + Q.i) S; with, - ,

Q output; computational unit 12 is fed to the input of the controller 7 and to one input of the diagnostic unit 14, to the second input it receives the output signal of the diagnostic unit 9.

 3

In block 14, the real-time algorithm has the following algorithm: at each i-th instant of time, the difference between the specified and measured water flow (Q ,,,;) which is usually called an error of control is determined; this error is regulated and compared with a valid value of 6 (6 const 0); - Ee: (Q, - Qi;) b, in this case, the value is chosen in advance in each specific case, depending on the required adjustment accuracy, the smaller the greater the adjustment accuracy should be; At the output of block 1, a discrete signal is generated (such as contact closure) to turn on, for example, a signal light, if the regulation error is out of allowable limits, i.e.

(Qt; - Q .;) f or (- Q „) -.

Claims (1)

in this case, the operator analyzes the operation of the system. If the time regulation error does not decrease, and the sensor 14, according to the information from block 9, is working normally, then it is necessary to solve the problems in controller 7. The formula of the invention A device for adjusting wet bulk material containing 0 five about 0 five a water flow sensor, a bulk material flow sensor and a humidity sensor, a humidity setting unit and a water split regulator connected to the actuator inlet, characterized in that. .In order to improve the accuracy of the device, it contains a first filter connected in series, a flow rate sensor diagnostics unit and a flow rate regulator diagnostics unit, a second filter connected in series, a bulk material flow sensor diagnostics unit and a computing unit and a third filter connected in series and a sensor diagnostics unit moisture, the output of which is connected to the second input of the computing unit connected by the third input to the output of the humidity setter, and the output to the second input of the unit In the diagnostics of the flow controller and the first input of the water flow regulator, the second input of which is connected to the output of the first filter, the inputs of the first, second and third filters are connected to the outputs of the water flow sensor, the flow sensor of the bulk material and the humidity sensor, respectively.