SU1479404A1 - Device for controlling loose material charging into hoppers - Google Patents

Abstract

The invention relates to the transportation, distribution and storage of bulk materials. The purpose of the invention is to increase the uniform distribution of bulk material in bins and increase speed. The device contains pluzkovye jumpers installed above the conveyor, and at its entrance and exit - sensors for the thickness of the bulk material layer, adders located in bunkers, material level sensors, signal averaging unit, dividers and control units. Signals proportional to the level of the feed material in the bins are fed to the outputs of the signal averaging unit. At the output of the adders of the first group, if the current value of the level differs from the average, an error signal appears. The latter, taking into account the signals of the thickness of the material layer at the inlet and outlet of the conveyor by the adders of the third third group, acts on the regulating units. They install the pull-off devices with respect to the plane of the conveyor belt at appropriate distances to ensure the same loading capacity of the material in each bunker. 1 il.

Description

one

The invention relates to the transportation, distribution and storage of bulk materials and can be used to automatically control the loading of bins, such as coal.

The purpose of the invention is to increase the uniform distribution of bulk material in bins and increase speed.

The drawing shows a diagram of the device.

The device contains mounted on the conveyor 1 plow diverters 2.1-2.P-1, and at its input and output sensors 3 and 4 thickness of the layer of bulk material, connected to the first input of adders 5 and 6, respectively, located in the bins 7.1-7. The 8.1-ip material level, connected to the corresponding inputs of the signal averaging unit 9 and to the first inputs of the adders 10.1-10. The output of the adders 10.1-U. p are connected to the first

the inputs of the adders 11.i-11.n-1, to the second inputs of which are connected the corresponding outputs of the divider 12, the input of which is connected to the output of the adder 5, and its second input is connected to the output of the adder 6, the first input of which is connected to the output of the divider 13, input which is connected to the output of the adder 10.n „

The outputs of the adders 11.1-11.n-1 are connected to the inputs of the corresponding control units 14.1-14.P-1, the outputs of which are connected to the corresponding plow dumpers 2.1-2.p-1.

The signal averaging unit 9, accepts sensor signals 8.1-8.p., proportional to the levels of the bulk in the bunkers, generates a signal at the output that is proportional to the arithmetic mean of the level in the bunkers, and can be made in series as a summing and separating device.

The electrical signal combining circuit can be performed, for example, in the form of a parallel electrical summing device.

The output summing voltage is fed to the input, for example, of a potentiometric dividing device, from the output of which, by selecting resistances, the output voltage of the averaging unit 9 averaged is reduced n times (by the number of bunkers).

The magnitude of the mismatch of the level of the bulk in the last bunker and the average value of the level coming from the output of the adder 10.p must be commensurate with the thickness of the layer of the bulk on the exit of the conveyor, coming from the sensor 4. The resistance value of the divider 13 is chosen so that the output signal at maximum the level mismatch in the bunker corresponded to the signal of sensor 4 at the maximum thickness of the bulk layer at the exit of the conveyor.

The device works as follows.

Bulk material by conveyor 1 and plow-dumpers 2.1-2.P-1 is fed to hoppers 7.1-7.P., into which the material level is measured by sensors 8.1-8.p.

In the process of filling bins 7.1-7. The thickness of the layer of material on

the inlet and outlet changes due to the different position of the plow ejector 2.1-2.P-1 above the level of the conveyor belt 1. This explains the stepwise distribution of the bulk material volume along the conveyor 1. In turn, the position of the plow ejector is determined by the values of the error signals, coming from adders 11.1-11.n-1 to the corresponding regulatory blocks 14.1-14.n-1.

Signals proportional to the level of the material in the bunker are fed to the inputs of averaging unit 9 and to the first inputs of adders 10.1-10. N, to the second inputs of which the output signal from averaging unit 9 is applied. At the output of the adders 10.1-yn, if the current value of the level differs from the average, the error signal appears

4, - Y. - Y,

where Y (is the current value of the level

flowing through the i-th bunker, $ Y is the average value of the level in the bunkers.

The error signals from the adders 10.1-10.n-1 are fed to the first inputs of the adders 11.1-11.n-1, from the outputs of which the signals go to the regulating units 14.1-14.p-1, which control the position of the corresponding plow diverters 2.1-2. n-1.

At the same time, using the sensor 3 for the thickness of the bulk material layer, the thickness of the bulk material at the inlet of conveyor 1 is measured, equal to X0, and using the sensor 4 to measure the thickness of the bulk material at the outlet of conveyor 1, equal to Xn.

The second input of the adder 5 receives the output signal of the adder 6, the second input of which receives a signal from the output of the divider 13, to the input of which from the output of the adder Yu receives the output signal d h of the mismatch of the current level of bulk in the bunker 7.n and the average level of the bunker

,

where Y „- the current level of bulk in the bunker 7.p,

Y - the average level of bulk

in bunkers.

The input of the divider 12 receives a signal from the output of the adder 5, equal to

Y - Y - L o lp

K.an,

Where

x „

X „

the magnitude of the signal is proportional to the thickness of the bulk inlet of the conveyor 1; the magnitude of the signal is proportional to the thickness of the loose at the exit of the conveyor; K-4n - the value of the signal coming from the output of the divider 13. K - proportionality coefficient.

From the outputs of the divider 12, the signals arrive at the second inputs of the corresponding adders 11.1-11.n-1.

In the absence of disturbing effects on the system (increasing or decreasing the load on the conveyor, unloading the bunker), the divider 12 receives a signal

A - X0 - Xn,

equivalent to the difference in the thickness of the loose layer at the inlet and outlet of the conveyor, respectively.

At the output of the divider 12, signals are generated that arrive at the second inputs of the adders 11..n-1. From the outputs of adders 11.1-11.n-1, the signals arrive at the corresponding control units 14.1-14.P-1. These signals, acting on the pull-off throwers 2.1-2.P-1, are set relative to the plane of movement of the conveyor belt at a distance of

X.J5 2X ЗХо (гЦХо 1пН) Хо

P

P

P

P

P

Starting with the plume ejector 2.P-1 (n is the number of bunkers).

This ensures the same loading capacity of the bulk into each bunker.

With increasing productivity of the conveyor 1 increases the thickness of the layer of bulk material on the conveyor, increases the output signal from the sensor 3 thickness of the bulk material, which is fed to the divider 12.

At the output of the divider 12 receive the increment of signals received at the second inputs of the adders 11.1-11.n-1. WITH

ten

15

20

25

height

from us479404

the outputs of the adders 11.1-11.n-1 increments of the signals arrive at the corresponding control units 14.1-14.P-1, which, affecting the pluzkovyh dumpers 2.1-2.P-1, raise them, respectively, by 4x 24x (p-1) LH

- 4 4, ---- - -

n n n

This value starts with the plow dumper 2.P-1.

This ensures that the same bulk loading capacity is reduced in each bin before the increase in the bulk level in bin 7.1 from the increment of the overall conveyor capacity becomes noticeable.

If the disturbance is caused by the unloading of any bunker or bins, an additional error signal will appear. For example, when unloading bulk from the first bin 7.1, a mismatch signal appears

25

thirty

40 35

45

50

55

4, Y, - Y,

where Y1 is the current value of the level of the bulk in the hopper 7.1.

Under the action of a misalignment from the established equilibrium state, the regulating unit 14.T moves the plow diverter 2.1 of the hopper 7.1 in the direction that reduces this discrepancy by increasing the flow rate to this bunker. This reduces the flow to subsequent silos. This happens as follows. The error signal D, Ј 0, summing with the output signal of the divider 12, reduces the signal, resulting in a decrease in the signal to the input of the regulating unit, 14.1, which, acting on the plow dumper 2.1, lowers it, increasing the flow to the hopper 7.1. Receipt to the remaining silos is reduced.

When the level changes in any of the subsequent bins, the system works in the same way.

When unloading the last bunker 7.n without a plow dumper, the error signal is

DP-YH-Y,

where YD is the current value of the bulk level in the bunker 7.p;

Y is the average value of 0 in bunkers.

The error signal d through the divider 13 is fed to the second input of the adder 6, from the output of which the signal goes to the second input of the adder 5, and from the output of the last signal as

and X0 - X „- K (Y n- Y)

enters the divider 12. When unloading the last bunker, the total mismatch A increases. The output of the divider 12 receive the increment of signals received at the second inputs of the adders 11.1-11.n-1. From the outputs of the adders 11.1-11.n-1, the increments of the signals go to the corresponding regulating units 14.1-14.P-1, which, affecting the plow dumpers 2.H2P-1, raise them. This leads to the fact that, in the absence of an increase in the total load on the conveyor 1, the loading capacity in the hoppers 7.1-7. P-1 decreases, and due to this, the loading of the bunker 7.p increases.

Thus, the leveling in the last bin 7.p is controlled by adjusting the capacity of loading the bulk into the remaining silos equipped with plow dischargers.

If the bulk flow rate at the inlet of the conveyor turns out to be zero or less than the volume at the exit of the conveyor, the filling of the hoppers 7.1-7. P stops. The conveyor is disconnected.

If the signal at the input of the adder 5 from the sensor 3 thickness of the layer of material at the input of the conveyor XB will be zero, then after a time interval

.. s

C v

five

0

0

five

five

0

five

0

where s is the length of the pipeline}

v is the speed of the conveyor belt, the conveyor is turned off. The value of xp can have a positive or zero value.

Claims (1)

Invention Formula A device for controlling bulk material loading bins containing material level sensors installed in bins connected to one of the inputs of the corresponding adders and corresponding inputs of the averaging block of signals connected to another input of adders located along the conveyor above the bins excluding the latter, connectors connected to the outputs of the respective control units, characterized in that, in order to increase the uniform distribution of the bulk material in the silos and of speed, it is equipped with sensors for the thickness of the bulk material, installed at the inlet and outlet of the conveyor, dividers and additional adders, one of which is connected to the thickness sensor c1 by the bulk material at the outlet of the conveyor and to the outlet of one of the dividers connected by the input to the output the last hopper adder, and the output to one of the inputs of another additional adder, the other input of which is connected to the sensor of the thickness of the layer of bulk material at the entrance of the conveyor, and the output d - to the input of another divider connected to the outputs of one of the additional inputs of third adders, the other inputs of which are connected to respective outputs -summatorov and outputs - to the inputs of respective regulating units. No 3 v; . .. ..... "... ; t. t i i2 ".,. HHnBB1HMTBVV- 4MVBB    i. "" "" ) 2.2 ) 2.n-f 3 .. ; t. t i i2