SU1033875A1 - Device for weight batching of substances to be mixed - Google Patents

Description

The invention relates to a weight-measuring technique, in particular to devices for multi-component metering, and can be used, for example, to meter components of a blast furnace charge.

A device for multi-component dosing is known, which includes weighing instruments, portions setting units, comparison units, materials loading speed determination units and control units G1}

This device cannot be used for dosing cases when two or more components of the mixture are metered into one weighing unit. ,

The closest to the technical essence of the invention is a device for weighing heavily the dosing of substances to be mixed, comprising a load receiving hopper mounted on 1 meter sensors connected to a signal measuring unit; and the load speed determination unit, the output of which is connected via the first switch to the input of the first storage unit, the first and second setting devices, respectively connected to one input of the first and second comparison units, the outputs of which are connected to the inputs of the gate control units of the first and second feeders whose outputs are connected to the control inputs of the first storage unit and the first switch, the output of which is connected to one input of the third comparison unit, the other input of which is connected to the output of the control unit limits the download speed, and output to the integrator input, and the fourth comparison unit, one passage of which is connected to the output of the signal measuring unit, and the output to the other input of the first comparison unit 2.

A disadvantage of the known device is the low accuracy of the component dosing, since when estimating the mass of the first and second components after switching on the second feeder, it is considered that the loading rate of the first component is constant and equal to the value recorded at the moment when the second feeder is turned on. In fact, the loading speed of components over a single dosing cycle may vary under the influence of, for example, current measurements of humidity and the particle size distribution of the components to be dosed.

The purpose of the invention is to increase the points. dosing / dispensing by taking into account the intensity of the intake of each of the substances when they are simultaneously loaded.

The goal is achieved by the fact that, in a device for weighing dosing of substances to be mixed, containing a load-receiving bunker mounted on force, ritelnye sensors connected to the signal measuring unit and block 5 (Determining the loading speed, output JKOToppro through the first switch Connected to the input of the first unit memory, the first and second control devices connected respectively to the same inputs of the first and second blocks of the comparison, the outputs of which are connected to the inputs of the control blocks of the first and second gates feeders whose outputs are connected to the control inputs of the first storage unit and the first switch unit, the output of which is connected to one third input; its comparison unit, the other input of which is connected to the output of the loading speed determination unit, and the output of the integrator input, and the fourth comparison unit, one input of which is connected to the output of the signal measuring unit, and the output - to the other input of the first comparison unit, is connected in series with the delay unit, the fifth comparison unit, the first scaling unit, ne the first key, the second storage unit, the first multiplication unit, the first adder and the second switch, an inverter connected in series, the third switch, the sixth comparing unit, the second multiplication unit, the second scaling unit, the second key, the third memory and the second adder: and timer The outputs of the control units for the first and second patches are connected to the control inputs of the timer, the first and second keys, the second and t) of its switches, and the second and third memory blocks, the output of the timer is connected to the control inputs of the first and second multiplication blocks, and the output of the first storage unit, to the second input of the first digital 4top, the output of the download speed determination unit is connected to the third switch, to the input of the fifth comparator unit and to the input of the delay unit comparison is connected to the inverter, one output of the second switch is connected to one input of the third comparison block, and the other output is connected to the input of the sixth comparison block, and the output of the Ijppa and third output of the third memory is connected to the inputs of the second and fourth th units of comparison. Figure 1 shows the block diagram of the proposed device; Figure 2 shows the loading rates. In FIG. 2, the following is indicated: A-, A, and moments of switching on and off of the first feeder; B, B, are the moments of switching on and off of the second feeder. The device contains a load-receiving bunker 1 mounted on load-measuring sensors 2, sensor measurement unit 3, load speed measurement unit k, first switch 5 first memory unit 6, timer 7, delay unit 8, five comparison unit 9, first scaling unit 10, first key 11, second storage unit 12, first multiplication unit 13, first adder, second switch 15, third time block 16, integrator second summer 18, inverter 19, third switch 20, sixth compare block 21, second block 22 multiply second tabbing unit 23, second key 2, third memorizing unit 25, fourth comparing unit 26, first setting device 27, first comparing unit 28, second setting device 29, second comparing unit 30, blocks 3 and 32 of controlling the gate of the second feeder with relay device 33 and the first feeder with a relay device 3. The device operates in a very well-defined manner. When the material enters the cargo receiving bin 1, the signal from the sensors 2, proportional to the mass of the material in the bunker 1, is fed to the input of the sensor signals measurement unit 3 and to the input of the loading rate block k, for example, made in the form of a differentiator. From the output of the block, a signal about the loading rate V {t) also goes to the inputs of the first switch 5 and block 8 of the delay, to the second input of the third switch 2, to the first inputs of the third block 16 and to the fifth block 9. 10 54. compare. In block 8, the download speed signal is delayed by the time interval T, the signal V (t - t) from the output of the delay block 8 is fed to the second input of the fifth comparison block 9, where it is subtracted from the signal V (t), the signal from the output of the fifth block 9 comparison is fed to the input of the first scaling unit 10, in which it is multiplied by a constant coefficient and to the input of the inverter 19, the output of which is equal to Cv (t) -V (t-rt3) is fed to the first input of the third switch 20. As a result At the output of the first scaling unit 10, a signal a (t) o is generated and an average value and change the download speed on the interval T, the input to the first key 11. The output from the inverter 19 is fed to the first input of the third switch 20. The control inputs of timer 7, first 5, second 15 and third 20 switches, first 11 and second 2 keys , the first 6, second 12 and third 25 memory blocks receive signals from the relay devices 33 and 3 of the gate control 31 and 32 of the second and first feeders (the logic of operation of the switches 5, 15, and 20, keys 11 and 2, blocks 6, 12 and 25 memorize next. If the first feeder is working and the second feeder is not working (graphs of figs. And 25 from point A to point B), then c. In accordance with the signals from the relay devices 33 and 3, the first switch 5 connects its input with the output that sends a load speed signal vCtJ (curve T in Fig. 2a and 2B) to the input of the third comparison unit 16, the second switch 15 does not connect its outputs to the input, the third switch 20 does not connect its output to the inputs, the first 11 and second 2 keys are open, the first 6, second 12 and third 25 memory blocks and integrator 17 are nullified. As a result, at the output of the third block 1b of the comparison, a signal is generated about the download speed of the second component 17, which is zero and the signal about the mass of the component to be dosed at the output of the second adder 18 is zero. If the first feeder is working and the second one is on (point B., in the graphs of Figures 2 and 25), the first switch 5 connects its input to the output connected to block 6 by signaling the download speed to the input of this memory block 6. A load speed signal V (tg Y at time tg is stored in block 6 and fed to the input of the first adder k. Timer 7 turns on the signal T from its output corresponding to the time interval from the time t p, the second feeder to the current time t It enters the inputs of the first 13 and second multiplication blocks 22. The third switch 20 does not connect its output to the inputs, the second switch 2 is open and the signal to the second input of the second adder 18 is zero. The first switch 11 closes, giving a signal from the output first scaling unit 10 to the input of the second storage unit 12. The value a (tg.) At the time ts is stored in the second storage unit 12 and is fed to the first input of the first multiplication unit 13, where it is multiplied by the signal T from the output of the timer 7. The signal from the output of the first multiplication unit 13 arrives at the first INPUT of the first adder} H, where it is summed with the signal V (tg) from the output of the first memory block.At the output of the first adder 1, a signal is generated

(t) V (i,) - b (t ,,) T,

estimates of the current load rate of the first component (curve 2 in fig. 2ai 2b). The second switch 15 connects its source to the first output, sending a signal V (t) from the output of the first adder 1 to the second input of the third comparison unit 16, where it is subtracted from the signal V (t) about the total load rate of the first and second components, as a result, at the output of the third match unit 16, an estimate signal V2 (t) of the current load rate of the BTopofO component is input to the integrator input, the output of which is the signal SjVt) of the estimated mass of the second component. The signal G2 (t) from the output of the integrator 18, the second input of which receives the zero signal from the output of the third storage unit 25. As a result of the summation of these signals at the output of the second adder 18, the Formula signal is Gjvt; estimates of the mass of the second component that was retouched (in Figures 2 "and 25, shaded with a large shadingJ.

If the second feeder is turned off and the first one continues to work (point B in FIG. 2c), then timer 7 is turned off, remember the amount of the joint load time of the first and second components, the first switch

5 supplies the signal V (t) to the second input of the third comparison unit 16, where it is subtracted from the signal V (t) arriving at its first output.

From the output of block 16 to the input of the integrator 17, a signal arrives, / 2 (t) D. The first key 11 opens, the first

6 and the second 12 memory blocks continue to remember the signals V (tg)

and a (tg), respectively, and at the output of the first adder 14 a signal is generated to estimate the loading rate of the first component V {t ,,) and the moment

t

tg cut off the second power

I

i (4) (4). (BJTB,

6

The second switch 15 connects its input to the second output, supplying a signal V (tg) from the output of the first accumulator H to the first input of the sixth comparison unit 21. The third switch 20, after an interval of time f (corresponding to the duration of the transition process in the dispenser from the moment t is turned off, the second feeder connects its output to the second input, giving a signal V (t) to the second input of the sixth comparison unit 21, where it is subtracted from sig-i Nala). The signal from the output of the sixth comparison unit 2 is fed to the first input of the second multiplication unit 22, where it is multiplied by the value Tz of the loading time of the second component. The signal from the output of the second multiplication unit 22 is fed to the input of the second scaling unit 23, where it is multiplied by a constant factor J.

2

As a result, the output of the second scaling blog 23 generates a signal

, (t). (t) -V ,,

equal to the error in estimating the mass gain of the second component due to the error in estimating the loading speed of the First component in the time interval Tg tej2 in Fig. 2l corresponds to the area of the triangle shaded by shading, bounded by trajectory 2 speed estimates and refined by trajectory 3 speed estimates obtained by interpolating the estimates by the interval Tg from the point V (tjj) to the point V (t), oT-. worn at time t „. The second key is 2 in .MOMeHt time tg +1; closes by applying to the input of the third storage unit 25 an evaluation error signal 62 (1) from the output of the second scaling unit 23. The signal Govt) is stored in the third storage unit 25 and fed to the second input of the second adder 18, where it is summed with the signal G2 (t ) where it is summed up with the mass component’s mass dose estimate. As a result, at the output of the second adder 18, a signal of a refined estimate of the mass of the second component is plotted. If the first power supply is turned off, the second continues to work (point A 2 in FIG. 2b), the first switch 5 does not connect its outputs to the input, timer 7 turns off, remembers the value of T Td-time of the joint load of the first and second components, the first key 11 opens , the first 6 and second 12 memory blocks continue to remember the signals V (tg) and a (tg), respectively, and at the output of the first adder I, a signal is generated, SL,). (in) 1 estimate the speed of loading of the first component at the time t / disconnect the first feeder. The second switch 15 connects its axog with the second output of the DOM, sending a signal V, (t) to the first input of the sixth comparison unit 21, and the input of the integrator 17 receives a signal 2 (t) 0. The third switch 20 after the time interval T from the moment t connects its output to the first input, by giving a signal (t) - V (tT) J from the output of the inverter 19 to the second input of the sixth block 21 of the comparison. Here, at the time point + T, the signal V (t) represents the load rate of the second component, and the signal VCt -t) correlates with the total load rate of the first and second components at the time of the first power supply shutdown. the value of i- | y (t) -v (t-ir) (t-tr) -v (J. is considered as the value of the actual dosing rate of the first component by the time the liepravai feeder disconnects. At the output of the sixth comparison unit 21, a signal is generated proportional to the difference between the actual dosing rate of the first component and its estimate at the time it arrives at the input of the second multiplication unit 22, where it is multiplied by the value Td from the output of which is fed to the input of the second scaling unit 23, where it is multiplied by a factor. block 23, the signal AGjit is formed), equal to the error in estimating the gained mass of the second component for estimating the errors in estimating the loading speed of the first component in time interval 1 -1 in figure 2y corresponds to the area of the triangle shaded by a small shading limited by trajectory 2 estimated by speed And refined by trajectory 3 speed estimates). The second key 2 closes at the time t with the input to the third storage unit 25 an evaluation error signal L (h, (1 / from the output of the second- scaling unit 23. The 4G2 signal (t) is stored in the third storage unit 25 and goes to the second input of the second adder 18, where it is summed with the signal G2 (t) for estimating the mass of the second component to be withdrawn. As a result, the signal of the updated estimate of the mass of the second component from the output of the second is generated at the output of the second adder 18. torus 1B is fed to the second input of the fourth comparator block 26, where it is subtracted from the signal of the total mass of the first and second components, coming from the output of the sensor signal measurement unit 3 of the sensor 2. At the output of the fourth comparator unit 26, a signal is generated about the current mass of ne (its component, arriving at the second input of the first comparison unit 28, the first input of which receives a signal from the first transmitter, proportional to: a given mass of the first component, the signal from the output of the first comparison unit 28 is fed to the input of the control unit 32 the first gate feeder. When equality of signals arriving at both inputs of the first comparator unit 28 is achieved, the dosing of the first component of the charge is stopped (point AZ in Figures 2o and 25). The current MGGSS signal of the second component from the output of the second adder 18 is fed to the second input of the second comparing unit 30, the second input of which receives a signal from the output of the second setter 29 lrsm1 Ortsi) to the given mass of the second component. A signal from the output of the second comparison unit 30 is supplied to the input of the gate control unit 31 of the second feeder. ; :. „., /; - - „. ;. ; When equality of the signals arriving at both the second input of the comparator unit 30 is achieved, the dosing of the second component of the charge (I shred (Hatch 82 in Figures 2 and 25)). Similarly, devices can be constructed for metering three or more components of the charge into one load receiving bin. the introduction of a timer, a delay block of the fifth and sixth comparison blocks of the inverter of the first and second keys, the second and third switches, the second and third memory blocks, the first and second multiplication blocks, the first and second scaling blocks, the first and second adders improves dosing accuracy multiple components in one hopper. The use of the proposed device will provide a reduction in metering errors on tO-SO by standard deviation. A reduction in metering errors as compared to a prototype, which can also be taken as a basic object, will lead to a Decrease in the degree of variability in the thermal state of the low-level furnace / characterized by a change in co. keeping flint in cast iron.

1033875 FIG. g

Claims (1)

DEVICE FOR WEIGHT DOSING OF SUBSTANCES TO BE MIXED - 1 VANIYU, containing a load hopper mounted on load cells connected to a signal measuring unit and a load speed determination unit *, the output of which through the first switch is connected to the input of the first storage unit, the first and second controllers connected respectively to one input of the first and the second comparison units, the outputs of which are connected to the inputs of the gate control units of the first and second feeders, the outputs of which are connected to the control inputs of the first memory unit and the first breakers, whose output is connected to one input of the third comparator, the other input of which is connected to the output determination unit download speed, and an output - to the input of the integrator, and the fourth comparison unit, one _in the course of which is connected to the output signal measurement unit, and the output x another the input of the first block of comparison, characterized in that, in order to increase the accuracy of dosing by taking into account the intensity of receipt of each of the substances during their simultaneous loading, series-connected 'delay block, heels are introduced into it comparison unit, the first scaling unit, the first key, the second storage unit, the first multiplication unit, the first adder <and the second switch, the inverter connected in series, the third switch, the sixth comparison unit, the second multiplication unit, the second scaling unit, the second key, the third storage unit and the second adder u_tai ~ v measures, and the outputs of the gate control units of the first and second feeders are connected to the control inputs of the timer, the first and second keys, the second and third switches and the second and third bl of the memory shafts, the timer output is connected to the control inputs of the first and second multiplication blocks, and the output of the first memory block is connected to the second input of the first adder, the output of the load rate determination unit is connected to the third switch, with one input of the fifth comparison unit and with the input of the delay unit, output the fifth comparison unit is connected to the inverter, one output of the second switch is connected to one input of the third comparison unit, and the other to the input of the sixth comparison unit, and the integrator output. RA and the output of the third storage unit are connected to the inputs of the second adder, the output of which is connected to other inputs of the second and fourth comparison units. SU ,, „1033875> for example, current moisture measurements and particle size distribution