SU960589A1 - Substance granulometric composition checking device - Google Patents

Description

.1 The invention relates to devices for determining the particle size distribution of substances, in particular pulps, and can be used in the cement, chemical, metallurgical, mining and other industries.

A device for measuring the registration of pulp granulometric composition is known, containing a sensitive element made in the form of a micrometer probe, a differential transformer sensor, a software device and a recording device, the micrometer probe being connected to the rocker by means of a rod, the opposite end of which the plunger of the induction transformer sensor is suspended, and the movement of the micrometer probe is controlled by an actuator according to a predetermined program in which The probe is mixed with aaxJBaTe or a part of a specified size class is transmitted to the plunger of the induction transformer sensor and then to the recording device. At the moment of raising the probe, the engine of the registering device is turned off, its arrow and the turre are stationary, and when measuring, the circuit in the phase winding of the engine, which p & Streas and the secondary npi of the boron, is closed, closes.

A disadvantage of this device is the low accuracy of the control of the particle size distribution, since it is rather spontaneous in the flow and the readings of the device are different at each moment in time and are also random in nature.

In addition, the periodic switching of the circuit in the phase winding of the engine at the time of measuring particles leads to pulsating noise penetrating into the suspension circuit, in the ambiguity of the device, and the commutator circuit of the driver leads to a fast output of the control device: contacts and decrease in reliability of the device . 396 The closest in technical essence to the invention is a device for controlling the granulometric composition of granular substances containing a substance supply device, a pulse size sensor and an amplifier, as well as comparing devices, summation units, decontamination devices, memory unit, information display device, task unit Comparison levels and a software control unit, with the outputs of the comparison devices connected to the first inputs of the summation block, the inputs of which are combined and connected to the software control unit, which is connected to the computing device, the memory unit, the information display device, and the comparison level block1 Ж1, the outputs of which are connected to the second inputs of the comparison devices, and the outputs of the summation blocks are connected to the corresponding inputs of the computing device, which is connected to the memory unit ti connected. to the display device. In this device, the ambiguity of measurements of the particle size distribution due to the random distribution of fractions in the stream is eliminated by averaging the individual measurements, as a result of which the accuracy of counter particle size distribution in the flow f2j is measured. However, when controlling the granulometric composition of the pulps in the device, pulse size sensors are used, the sensitive element of which is made in the form of a micrometer probe, which is then transformed into an electrical signal by the induction-transferor (pulse converter), and when the loop sensor is raised, there is an uninformative signal, several tens of times as great as the useful signal, which leads to false triggering of the comparison devices and the impossibility of using it with these sensors to control the pulp particle size distribution. The purpose of the invention is to expand the use of the device with a simultaneous increase. The goal is achieved by the fact that the device for controlling the granulometric composition of substances contains a device for feeding a substance, a pulse size sensor and an amplifier, as well as comparing devices, summing units, calculating devices, a memory unit, a device for displaying information, unit 94 for setting levels of the program control block, the outputs of the comparison devices are connected to the first, the first inputs of the summation blocks, the second - whose inputs are combined and connected to the program control block, Thoroe connected to the processor. The device, the memory unit, the information display device and the comparison level setting unit, the outputs of which are connected to the second inputs of the comparison devices, and the outputs of the summation units are connected to the corresponding inputs of the computational device that is connected to the memory unit connected to the information shortening device. circuit, driver, key and two limiters, with the output of the pulse sensor connected to the input of the first limiting body, the output of which is connected in series The shortening circuit, the second limiter and the driver are connected to the control input of the key, the signal input of which is connected through the amplifier to the gate of the first limiter, and the output of the key is connected to the second inputs of the comparison devices. Connection via a key, for example electronic, output amplifiers To the inputs of the comparison devices only at the moment of particle measurement allows the device to use pulsed sizes, the sensitive element of which is made in the form of a micrometer probe, which are used venno in controlling particle size distribution of pulp and exclude uninformative sensor signals. At the same time, the level of the switched signal at the key input due to its amplification by the amplifier is several hundred times greater than the control key, as a result of which the switching noise is incommensurable in comparison with the utility signal and practically does not affect the measurement results. Forming the control signal of the key directly from the signal of a pulse-size sensor electronically eliminates the use of electromechanical interrupters, which increases the reliability of the device and reduces its inertia, and the use of an amplifier limiter input prevents the amplifier from overloading the sensor circuit, which also increases device reliability. FIG. 1 shows a block diagram of the device in FIG. 2, - diagrams of cHrHanojB ,. what is the formation of the control signal of the key from the signals of the galpulse sensor size? The device contains a series-connected supply device 1, a pulse sensor 2, the first limiter 3, the amplifier 4 and the first input of the key 5 whose output is connected to the second inputs comparing devices 6-8. The input of the amplifier 4 with the input of the shortening circuit 9, which is sequentially connected to the second limiter 10 and form the 11, the output of which is connected to the second fUioay key 5. The outputs of the comparison devices 6-8 are connected to the MP inputs of blocks 12-14 summed The outputs of which are connected to the corresponding inputs of the computational yci of device 15. The memory block 16 is connected to the computational device 15 and the information display device 17 {{ation. The outputs of the blot 18 set reference levels are connected to the second | The first inputs of the corresponding comparison devices 6-8. The first output of the block is 19 software controls. It is connected to the control inputs of the computing device 15, the memory block 16 and the information display device 17. The second inputs of the summation blocks 12-14 are combined and connected to the second input of the program control unit 19, the third output of which is connected to the control input of the comparison level setting unit 18. The device works as follows. . The analyte, such as pulp, takes up the feeder 1 into a pulse meter of 2 sizes, the chu & s element of which is made, in the form of a micrometer probe with a pad, and its reciprocating motion is converted into an electrical signal, for example, by means of a differential transducer ( not shown). The output signal 20 of the pulse sensor of 2 dimensions, when the reciprocating movement is performed by the myriometric probe, has a bell shape and at the moment of abutment into the particle, the distance between the micrometer probe and the bolster is fixed, the output signal has a drop shape, and the magnitude is proportional to the particle size, after it, the reciprocating motion of the micrometer probe is repeated. In order to prevent the passage channel from clogging up with large granules of the rshler, the micrometer probe leaks on the carrying mill of millihetres, while the maximum size of the measured parts in the pool is tens of microns. At the same time, when raising the probe at the output of the pulse size sensor, there is an uninformative signal, in tens {KI3 for the time being, useful. the signal generated by the converter at the time of the stop of the loop in the particle. The output signal of a sputum sensor of 2 sizes is maximized by the maximum limiter 3 and is amplified by amplifier 4. Limiting the input signal of the amplifier to the maximum eliminates overloading the input amplifier key and extends the range of the useful signal. Amplified 4-signal is supplied to the input of the electronic key 5. The secondary signal 21 from the output of the limiter 3 simultaneously receives the output of the shortening circuit 9, for example, differentiating pepi, the output of which produces different polarity short pulses 22, corresponding to the moment of bending of the signal, and negative pulses correspond to the moment stop the probe into the particle. OP-, the corrector 10 limits the positive impulses, with the atom negative (short) impulses .23 arrive at the input of the imaging unit 11, for example, one vibrator, which forms a rectangular impulse signal 24 of adjustable duration, the leading front of which ct lacks the moment of the probe probe in the particle. At the same time, the duration of the formed pulse is set to no more than the ELEP holding time of the measured particle. Thus, at the controlled input. . Key 5 receives rectangular gating pulses formed from signals from the sensor of different times, the front 4font of which corresponds to the point of the probe in the granule, and its duration does not exceed the time of the impact with the probe in the “3d granule. In this case, the key 5 is turned on for the duration of the control pulse and the duration of the signal 25 from the output of the key 5 cooTBeTCiw is the duration of the control pulse, and its amplitude is proportional to the particle size. A pulse from the output of the key 5 is fed in parallel to the connected inputs of the comparison SECOND devices 6–8, the sensitivity of each of which is through a block, and 18 setting the levels of comparison VMS is adjusted to the amplitude corresponding to the measured one. The number of matching devices and blocks of sums depends on the number controlled fractions. The sensitivity setting of the comparison devices 6–8 is carried out by the unit 18, the task of comparing levels according to the program, received from the program control unit 19. Comparison of the device 6–8 pulses corresponding to particles of a larger size are selected for each channel. The pulses from the outputs of the comparison devices 6–8 are arranged in accordance with the corresponding blocks 12–14 of the summation, each time the sum of the pulses is carried out, and the number of particles is larger than this size or cumulative outputs. The formation of control pulses corresponding to the intervals (periods) of summation is carried out by the program control block 19. The signals corresponding to the cumulative outputs from the corresponding summation blocks 12-14 enter the computing device 15, in which the signals of the neighboring cumulative outputs are subtracted and the difference signals corresponding to the counts of the measured signals are divided by the number of measured signals The signals thus calculated, corresponding to the outputs of the classes, from the corresponding outputs of the computing device 15 are placed in the memory block 16, in which the following is carried out: computations of several computed values of the signals for each class output. The stored signals from memory block 16 are fed to computing device 15, where they are averaged over each output of the class. The signals corresponding to the averaged values of the outputs of the monitored classes are transferred to the memory block 16, where they are stored with up to the next regular averaged signals. From the memory block 16, sygyps, proportional to the average outputs of the monitored classes, aocrys into the information display device 17 for recording and visual observation. The operation of the units 12-14 of the sum of the computing device 15, the block 16 of the memory and the information display device 17 is carried out by means of the software control unit 19 < a < 1 > The expansion of the use of a device with high accuracy of control, allows to increase the accuracy of control of the particle size distribution of the pulp in the production of, for example, cement and improve its quality indicators, while reducing the energy consumption. Formation of the control signal | the key directly from the signal of the pulse size sensor by electronic cn (x; o) increases the speed of the device and allows an increase in the frequency of measurements, thereby increasing the representativeness of the measurement results and eliminating the use of a cable to feed the control signal from the pulse size sensor to and displaying information Formulas for isotopia Device for monitoring the granulometry of the composition of substances containing a device for feeding a substance, a pulse size sensor and an amplifier as well as comparing devices, summation blocks, computing device, memory block, information display device, comparison level setting block and many avpey program block, the outputs of the comparison devices connected to the first inputs of the summation blocks, the second inputs of which are combined and connected to a software control unit, which is connected to a calculator device, memory unit, information display device and comparison level setting unit, the outputs of which are connected to the second inputs and clips and devices, and the inputs of the summation blocks are connected to the corresponding inputs of a computing device, which is connected to a memory unit connected to an information display device, characterized in that, in order to expand the application area with a simultaneous increase in reliability, it is equipped with a shortening circuit a driver, a key and two limiters, with the output of an output dimensional sensor connected to the input of the first limiter, the output of the KOTopoj-o through a series-connected circuit connected in series, Torah ogranichntel and shaper connected to uprvvl yuirim vhods key 4, which a signal input via an amplifier connected to the output of the first limiter and switch output is connected to second inputs of CPA & nivayushih devices.

Sources of information format; taken into account in the examination

1. Author's certificate of Agricultural Production Union No. 168462, cl. G 01 B, 1965.

2. CXZCP copyright certificate according to application number 29121О7 / 18-25,

cl. O1 N 15/02, 17.O4.80 (prototype).

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Claims (1)

A device for controlling the particle size distribution of substances, comprising a substance supply device, a pulse size sensor and an amplifier, as well as comparison devices, summing units, a computing device, a memory unit, an information display device, a unit for setting comparison levels and a program control unit, the outputs of devices are connected to the first inputs of the summing units, the second inputs of which are combined and connected to the program control unit, which is connected to the computing device with a memory unit, an information display device and a comparison level setting unit, the outputs of which are connected to the second inputs of the comparison devices, and the outputs of the summing units are connected to the corresponding inputs of the computing device, which is connected to the memory unit connected to the information display device, characterized in that, in order to expand the scope with a simultaneous increase in reliability, it is equipped with a shortening circuit, a shaper, a key and two limiters, and the output imp snogo size sensor connected to the input of the first limiter, the output of which through unity so960589 successively shortened chain, and the second restrictor driver connected to the control key input, the signal input of which via an amplifier connected to the output of the first limiter and the output switch coupled to the second inputs of the comparators.