SU1425273A1 - Apparatus for controlling dredging process - Google Patents

Abstract

The invention relates to the mechanization and automation of open pit mining and m. used in drags. The purpose of the invention. - povpenie ... performance dredging. The device is equipped with two nonlinear elements 8 and 10, a sensor (D) 12 ,, a speed setting device 14 and a torque setting device 15, an electric motor (EP) 3 barrels, a sensor 17 and a setting unit 18 for driving the loaded conveyor, divider 19, four adders ( C) 4,13,16 and 20 and a quadrant 11. KS 16 is connected to D 17 and setpoint 18. Output C 16 is connected to the first input of the divider 19, to the second input of which is connected (L s

Description

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4 12, Output divider 19 is connected to Kj input C 20. Signal 14 from output C 40, proportional to the mass of the bottom Product, arrives at C 9. Output of speed limiter and D 12 via square 11 connected to C 13. Signal d of output C 13 proportional to the mass of itpyHTa, goes to C 9, Vykod C 9: Through controller 2 is connected to the EA 1: repack circuit and through a nonlinear one. Item 10, controller 5, C 4 - to the FTE,

Depending on the strength of the soil, EP 1 and 3 operate in two speed control zones. With a small strength of the soil, the resulting signal from the output of C 9 causes the EP 3 to rotate with a maximum rotation frequency. With a further increase in rock strength or a decrease in the percentage of the fine fraction, the resulting C 9 signal leads to a decrease in the angular velocity of the EP 1 and 3. 3 sludge.

one

I The invention relates to the mechanization and automation of open mining, mining and can be used in dredges.

I The purpose of the invention is to increase the productivity of dredging by reducing the loss of the valuable component of the enrichment process with changing; mining conditions working hag. ,

 FIG. 1 is a block diagram of a dredging process control device; in fig. 2 - graphs of the change of the parameters of the drives depending on the strength of the city under development with a constant grain size distribution; in fig. 3 - the same, q dependence. From the change in the percentage of the fines content at the Constant value of the rock fortress. The device contains a drive 1 cher-Pak circuit controlled by the controller 2 performance, electric drive 3 drums, controlled by the first adder 4, the output signal of which is the difference signal setting the maximum frequency of rotation of the barrel and the signal regulator 5 frequency of rotation of the barrel, block 6 soil mass calculation, determining the total mass of rock in the barrel; block 7, calculating the mass of the bottom product, determining the mass of the bottom product in the barrel; the first nonlinear element 8, the dead zone of which determines the max imalno allowable rock mass in the vat, the second adder 9, whose output signal is determined from zao signal vgchitaniem

five

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five

0

five

The tribute to the mass of the lower product in the barrel of the signals of the device for calculating the mass of the lower product is m д g and the first nonlinear element, and the second nonlinear element is 10.

Block 6 contains a quad 11, the input of which is connected to the sensor 12 of the engine rotation frequency of the drum, and the output to the first input of the adder 13. The second input of the adder 13 is connected to the output of the sensor 14 of the motor moment of the barrel, and the third input of the adder - with the setpoint 15 of the idling moment .

Block 7 contains an adder 16, the first input of which is connected to the sensor 17 for the drive power of a pebble conveyor, and the second to the source 18 for setting the idle power. The output of the adder 16 is connected to the input - a divisible divider 19, the input-divisible of which is connected to the sensor 12, and the output - to the first input of the adder 20, the second input of which is connected to the output of the block 6.

As regulators 2 and 5 in

the system is used by pps proportional to I--.

integral controllers.

The device works as follows.

Based on the maximum performance of the process pumps and information on the technological features of the soil being developed, the operator sets the system signal h

the throughput of the lower product at the gateways, which determines the T / L ratio.

Block 6 calculates the total mass of soil in the barrel. As the barrel rotates, the rock in it is brought into complex motion. The soil, captured by the longitudinal ribs of the inner surface of the barrel, rises to a certain height and then falls down, making for such a cycle a translational movement along the longitudinal axis of the barrel due to its angle of inclination to the horizon. In the barrel, a soil sector is thus formed on the inner surface, shifted by its center of mass by a certain angle in the direction of rotation. When the frequency of rotation of the barrel changes, the position of the center of mass of the rock within it changes. The moment developed by the engine depends on the mass of the rock and its position, determined, besides the design features of the barrel, and the frequency of its rotation.

The mass of the soil by block 6 is calculated by the following empirical formula obtained as a result of research:

m oi, (M-Mhh) -otjW, (1) where o is a dimensional coefficient;

size factor, taking into account or reducing the percentage of

M XX

About 35

40

melting dependence of the motor moment of the barrel on the speed;

the moment of the engine of the barrel; the moment of idling of the engine of a barrel; drum rotation frequency. In the steady state, the capacity of the drum in terms of the top product is proportional to the useful drive power of the pebble conveyor. The mass of the top product in the barrel at a constant frequency of its rotation is also proportional to the useful drive power of the pebble conveyor. When the frequency of rotation of the barrel changes, the mass of the top product changes according to the principle of self-discharge, i.e. in the zone of possible frequency control, the mass of the upper product in the barrel is inversely proportional to the frequency of its rotation. The soil mass in the barrel is the sum of the masses of the upper and lower products in it.

Block 7 calculates the mass of the underflow in the barrel using the formula

45

Neither the fines fraction of the mining apparatus, due to the limitations that have arisen in it, can provide a given performance for the lower product. In this case, the drives begin to work in the second zone at the maximum possible productivity of the mining apparatus for a given rock strength at a lower barrel rotation frequency corresponding to a given mass of the underflow in it. By maintaining the masses of the bottom product in the barrel by varying the frequency of its rotation, the performance of the bottom product decreases, but the conditions for disintegrating are improved and the screening product is distributed more evenly over the gateways.

If, with a change in the granulometric composition of the soil in the direction of decreasing the fine fraction, the total mass of the drum reaches its maximum permissible value, i.e. there is a restriction on the throughput of the barrel, and the frequency of rotation of the barrel is lower, then the frequency of rotation increases.

55 a barrel, and the productivity of the mining apparatus decreases, ensuring the operation of the barrel with the highest possible productivity (from

H.n ™ r- “i

Wrr-wx.,

g w

yr

W

V.K

0 3 where W - the current capacity of the electric drive pebble conveyor;

idle power of the pebble conveyor engine;

size factor. Depending on the specific mining and technical conditions of excavation, the drives of the mining apparatus and barrels work in one of the control zones, stabilizing the mass of the bottom product in the barrel.

With an increase in soil strength or a decrease in the percentage of fines (Figs. 2 and 3) in the first control zone, the productivity of the mining apparatus is less than the maximum possible for a given rock strength and corresponds to the value needed to stabilize a given weight of the bottom product in the barrel at its maximum rotation frequency, which, under these conditions, corresponds to the constant productivity of the lower product and the same conditions for extracting the useful component (T / M Const). With further growth of rock strength

35

40

. -

45

neither the fines fraction of the mining apparatus, due to the limitations which have arisen in it, cannot provide the specified productivity for the lower product. In this case, the drives begin to work in the second zone with the maximum possible output of the mining apparatus for a given rock strength at a lower frequency of rotation of the barrel, corresponding to a given mass of the bottom product in it. While maintaining the mass of the bottom product in the barrel by changing the frequency of its rotation, the performance of the bottom product decreases, but the conditions for disintegration are improved and the screening product is distributed more uniformly over the gateways.

If, with a change in the granulometric composition of the soil in the direction of decreasing the fine fraction, the total weight of the soil in the barrel reaches the maximum permissible value, i.e. there is a restriction on the throughput of the barrel, and the frequency of rotation of the barrel is lowered, then the frequency of rotation increases

55 a barrel, and the productivity of the mining apparatus decreases, ensuring that the barrel operates with the highest possible performance (as a result of the drive parameters in this case is shown in Fig. 3 by the dotted line). ;

Claims (1)

Invention Formula A dredging process control device containing the first sum atop, the output of which through a performance regulator is connected to a scoop circuit drive, a drum speed regulator and a drum electric drive, characterized in that, in order to improve the dredging performance, the device is equipped with two nonlinear elements, sensors of speed and torque of the motor of the barrel, sensor of the drive power of the pebble conveyor, torque and power pickups for the idler, speed sensor, torque generator, divider, vadratorom q four adders, the sum output of the second locator is connected to the drive drum the first and second outputs of which are connected respectively to {enes sensors torque and engine speed drums, a first input of a second adder connected to the output of the rotation frequency regulator drums. and AA.MONS Q D.A.naks AT D. s and np t / f t np zone 2 zone Thebes.2 and the second input is to the speed setting unit, the output of the first adder is connected via the first nonlinear element to the input of the drum speed controller, and the output of the drum motor torque sensor is connected to the first input of the third adder, to the second input of which the idle speed setting device is connected. the third input is a quadr, the output of the third adder is connected to the first input of the fourth adder and through the second non-linear element to the first input of the first adder, to the second input of which the time setting is connected, and to the third he input of the first adder of the adder connected to a fourth output drum speed sensor output is connected to the input and a first squarer. the divider input, to the second input of which the output of the fifth adder is connected, and the divider output is connected to the second input of the fourth adder, a no-load power setting device is connected to the first input of the fifth adder, and a pebble conveyor drive power sensor is connected to the second input of the fifth adder. d, A.mans il (S fiw.ff g / f t ft n. 2zone Fig.Z Yes. max f (x) D.A H.n.nptfmo- type np, G1zh (-)% 1eona