SU1717742A1 - Control device of suction dredger - Google Patents

Abstract

This invention relates to hydromechanization. The purpose of the invention is to increase the productivity of the dredger and the efficiency of its use. The dredger contains flow sensors 1, density 2 pulp, head 3. power 4 soil pump, vacuum 5, two units 6 and 7 comparison, unit 8 determining the expected flow, unit 9 calculations, three multiplexer 10, 11 and 12, two keys 14 and 15, element 16, two registers 17 and 18, block 19 of the control, the actuator 20, scoreboard 21. 1 s.p. f-ly, 3 ill.

Description

The invention relates to hydromechanization, in particular to devices for the automation of suction dredges used in transport construction and other industries of the national economy.

A device for monitoring the soil intake of a dredger is known, which contains sensors for the electrical conductivity of the pulp and working fluid, a vacuum sensor, measuring units, sources of reference signals, logic processing, signaling and indication units, comparators and delay units. The device allows you to control the efficiency of the soil-collecting equipment and timely detect the deviations of the technological parameters from the norm.

However, the device does not allow to control the degree of wear or the effectiveness of the operation of the soil deposit.

A device for controlling a suction dredger is known, comprising sensors for flow rate, soil pump power, density, pressure and vacuum, units for determining the allowable amount of vacuum and expected flow, a comparator unit, a control unit and an actuator that regulates papillonation speed. The operation mode of the suction dredge is determined by the readings of the first four sensors, while the control and regulation parameter is calculated by the formula

102

Q (t) -y (t)

M (t)

, 2gQ2 (t + 7)

+

c2

OB

(D

where N (t) is the power consumed by the ground pump;

Q (t) - pulp consumption;

y (t) is the pulp density;

M (t) is the pressure in the pressure pipe;

 System efficiency pump - pipeline;

SH, SB is the cross-sectional area of the pressure and suction pipelines.

The calculated value of Vg (t) is considered optimal and is compared with the current vacuum of V (t) at all. The regulation of the dredger is based on the result of this comparison. In formula (1), the efficiency of a hydraulic system is considered constant and corresponds to the passport efficiency of a ground pump. However, as pumping high-abrasive slurry, such as gravel, large

five

0 5

0

50

five

0

five

50

ska et al., the hydraulic qualities of the pumps gradually deteriorate, which leads to a decrease in the head developed by the pump, and hence in the productivity of the dredger along the ground. At the same time, the adjustment accuracy by the formula (1) is reduced due to an unaccounted efficiency change. In the process of pumping slurry, the impeller wears out most quickly. Since it has a decisive influence on the performance of pumps, the determination of the economically viable service life of the T wheel is an important national task. To solve this problem theoretically, it is necessary to know for each soil category the head H (Q, t) and the efficiency rj (Q, t) of the pump, corresponding to the working flow Q at the current time t. Currently this task is not solved. The proposed way of solving the problem of determining the appropriate service life T of the impeller is based on the systematic measurement of the value of (Q, t) (for example, once a week) and its substitution into the appropriate formulas for calculating T. At the same time, the regulation of the dredge mode is carried out according to ( I) considering changes in efficiency.

The aim of the invention is to increase the productivity of the dredge and the efficiency of its use by increasing the accuracy of adjusting the technological mode and determining the optimum life of the impeller.

The goal is achieved by the fact that the device for controlling a suction-jet projectile contains a vacuum sensor, as well as flow sensors, pulp density, head and power of the ground pump, the outputs of which are connected to the first, second, third and fourth inputs of the block for determining the allowable vacuum (block computations), the fifth input of which is connected to the output of the unit for determining the expected flow, the input of which is connected to the output of the flow sensor, and the first output of the computing unit is connected to the first input of the control unit, the output to It is costly connected to the first input of the actuator, the second input of which is connected to the first output of the comparison unit, the second output of which is connected to the second input of the control unit, additionally equipped with the first, second and third multiplexers, board, second comparison unit, element And, the first and second keys installed on the mechanism, lowering the frame, and the mechanism that opens the discharge pipe gate, respectively, and

also the first and second registers, with the output of the first register connected to the first input of the second comparison unit, the second input of which is connected to the output of the flow sensor, and the output connected to the first input of the And element, the second and third inputs of which are connected to the outputs of the first and second keys, and the output is connected to the sixth input of the computing unit and the first inputs of all the multiplexers, the first output of the first multiplexer is connected to the first input of the first comparison unit, the input is connected to the output of the vacuum sensor, and the second output is connected to The fourth input of the calculator, the second output of which is connected to the second input of the second multiplexer, the first output of which is connected to the second input of the first comparison unit, and the second output is connected to the input of the second register, the output of which is connected to the second input of the third multiplexer, the first output is connected to the eighth an input of a computing unit, wherein a computing unit comprising three multiplication / division units and a summing unit, the first input of which is the third input of the unit, and the second and third inputs are connected to the outputs according to The first and second inputs of the first multiplication block are fifth; the first and second inputs of the second multiplication block and the first input of the third multiplication block are combined and are the first input of the block, the second input of the third multiplication block is The second input of the block and the output of the third multiplication unit are connected to the first input of the division unit, the second input of which is the fourth input of the block, additionally provided with the second and third summation blocks, the fourth multiplication unit, the second The dividing unit, the counting unit and the logic unit whose outputs are the first and second outputs of the calculation unit, the first input of the logic unit is the sixth, block input, the second input is connected to the output of the fourth multiplication unit, and the third input is connected to the output the third summation unit, the first input of which is connected to the output of the second division unit, and the second input is connected to the output of the first summation unit and the second input of the second summation unit, the first input of which is the seventh input of the unit, and is connected to the second input of the fourth multiplication unit, the first input of which is connected to the output of the first division unit and the second input of the second division unit, the first input of which is connected to the output

the conversion unit, the first input of which is the eighth input of the block, and the second input is connected to the second input of the third multiplication unit.

5 In FIG. 1 shows a functional diagram of the device; figure 2 is a functional block diagram of the calculation; in FIG. 3, the algorithm of operation of the computing unit.

The device contains flow sensors 10 1. density 2 pulp, head 3, power 4 soil pump, vacuum 5, blocks 6 and 7 comparison, block 8. determining the expected flow, block 9 calculations, multiplexers 10.11 and 12, keys 14 and 15 element

5 AND 16, registers 17 and 18, control block 19, actuator 20 and board 21. Sensors 1-4 are connected to the first, second, third and fourth inputs of block 9 calculations, sensor 1 is also connected

0 to the second input of the comparator unit 6 and the input of the unit 8 for determining the expected flow rate. The output of block 8 is connected to the fifth input of the computing unit, the sixth input of which is connected to the first inputs of multiplexers 10, 11 and 12 and the output of the And 16 element. rarefaction, and the first output is connected to the first

0 input block 7 comparison. The eighth input of the computing unit is connected to the second output of the house of the multiplexer 12, the second input of which is connected to the output of the register 18, and the first output is connected to the board 21. The first output of the computing unit is connected to the first input of the control unit 19, the second input of which is connected to the second the output of the comparison unit 7, and the output Connected to the first input of the actuator 20.

0 The second output of the computing unit is connected to the second input of the multiplexer 11. The second output of which is connected to the input of the register 18, and the first output is connected to the second input of the comparison unit 7, the output of which is 5 is connected to the second; the input of the actuator 20. The inputs of the element 16 are connected to the outputs of the keys 14 and 15 and the comparison block 6, respectively, and the first input of this block is connected to the register output

17

Calculation block 9 contains multiplication blocks 22, 23, 24 and 28, division blocks 25 and 30, summation blocks 26, 27 and 31, efficiency calculator block 29 and logic block 32. The inputs of blocks 22-27, 29 and 32 are the fifth, first, second, fourth, third, seventh, eighth, and sixth inputs of the computing unit, respectively. The third and second inputs of block 26 are connected to the outputs of blocks 23 and 22, respectively, the second inputs

which are connected to their first entrances. The inputs of block 23 are connected to the first input of block 24, the output of which is connected to the first input of block 25, the output of which is connected to the first input of block 28 and the second input of block 30, the output of which is connected to the first input of block 31, the second input of which is connected to the output of block 26 and the second input of block 27, and the output connected to the third input of logic unit 32. The outputs of block 32 are the first and second outputs of the computing unit, and the second input of block 32 is connected to the output of block 28, the second input of which is connected to the output of block 27. The first input block 30 is connected to the output House unit 29, a second input coupled to the second input unit 24,

The device works as follows.

Before starting the process, the degree of wear of the impeller is determined by calculating the parameter tj (Q, t). The definition of this parameter must always be carried out under the same conditions, i.e. when working on water with a given flow rate, with a constant immersion depth of the suction nozzle and a constant length of the pressure pipe. The constancy of these conditions ensures the unambiguity of the definition of (Q, t) as the wheel wears. To ensure these conditions, the bagmeister lowers the grounding device frame to a predetermined depth, opens the valve installed on the discharge pipe near the ground pump, then turns on the pump and adjusts the flow to the specified value (the specified flow rate is contained in register 17). At the same time, the keys 14 and 15, mounted on the mechanism lowering the frame and the mechanism opening the valve, are closed, respectively, and at the output of the comparison unit 6 there appears a single signal that enters the input of the And 16 element. The other inputs of this element receive signals from the outputs of the keys 14 and 15, therefore, a single signal appears at its output, which goes to the control inputs of the multiplexers 10, 11 and 12. As a result, the output of the vacuum sensor 5 is connected to the input of the calculation unit 9, the output of the calculation unit is connected to the input register 18, and the output of this register is connected to the input of the scoreboard 21,

Values Q (t), Q (t + T),. Y (t), - M (t), - N (t) are fed to the inputs of the computation block. V (t) and a single signal from the output of the element And 16.

Therefore, in the calculation block, the value (t) for water is calculated by the formula

o (t) M (t) + 29Q22 (t) 5SH

(t + T) + v (t) x

c2

OB

ten

Q (t) -y (t)

102: N (t)

(2)

The resulting efficiency is transmitted from the output of the computing unit through multiplexer 11 to

register 18 is memorized in it and through multiplexer 1.2 is displayed on the board 21. The Bagermeister has the ability to compare the obtained efficiency value with the minimum allowable and decide on

putting the dredge into operation or replacing a worn wheel with a new one (minimum permissible. Efficiency is calculated in advance for water with an economic justification of time T).

If the calculated efficiency exceeds the minimum permissible, then the baggermaster lowers the frame of the soil collecting device and closes the valve on the discharge pipeline, as a result of which the keys open

14 and 15 and the inputs of the element And 16 receives signals of logical zero. The zero signal from the output of the element 16 is fed to the control inputs of multiplexers 10, 11 and 12. At the same time, the outputs of the vacuum sensor 5 and

unit, computing 9 is connected to the inputs of comparison unit 7, and the output of register 18 is connected to the input of the calculating unit. The parameters Q (t), QCt + t), y (t), M (t), N (t) 7 / q (t) and the zero signal from the output of the element 16 arrive at the inputs of the computation block, therefore in the computation block efficiency conversion for pulp according to the formula

45

7 (t) / o (t) (1-0,33-S),

(3)

“.S-Zyoh1-volume consistency of the pulp;

UT is the density of the soil (constant for

a certain category of soil),

and taking into account the efficiency obtained, the allowable value of the negative pressure Vs (t) in the suction is calculated. This parameter is transmitted through multiplexer 1.1 to the first input of block 7.

compare. The second input of this block is supplied via the multiplexer 10 to the existing value of the negative pressure V (t). The output signal of the comparator controls the operation of the actuator 20. In this case

The operation of the device for regulating the operation mode of the dredger does not differ from that known. The operation of the device is monitored by the control unit 19, which turns off the actuator and activates an alarm when one or more sensors or blocks come out of service.

The calculation unit calculates the efficiency and vacuum values in the suction. In this case, the efficiency for water is calculated using 10 blocks 22-28 (FIG. 2), and block 29 converts this efficiency from water to pulp in accordance with expression (3). Algorithmically, this calculation is provided by operators 1-7 (Fig. 3). In calculating the dilution, 15 intermediate calculations from blocks 25 and 26 are used and the calculated efficiency for water that flows through multiplexer 1.2. The calculation of the vacuum is provided by blocks 22-31. Logic block 32 20 outputs the value of efficiency or vacuum from blocks 28 or 31 to the second output of the computing block, and control signals from these blocks to the first output, depending on the value of P, the control signal received from the output of the AND 16 element. This function is described by operators 10 and 11. The remaining operators, i.e. 12, 13 and 14, perform the functions of the control unit in accordance with the prototype.

Thus, the device makes it possible to increase the accuracy of mode control by taking into account the change in efficiency as the impeller is worn out and to exclude the operation of the dredge with a wheel that is worn out over 35 standards.

Claims (1)

1. A device for controlling an earth-pumping projectile containing flow sensors, density, head and power of an earth pump connected respectively to the first, second, third and fourth inputs of the calculating unit, a vacuum sensor 45, a unit for determining the expected flow connected between the output the flow sensor and the fifth input of the calculation unit, the comparison unit, one output of which is connected to the actuator §Q directly, and the other through the control unit, which differs from the fact that, in order to increase the performance the stability of the dredger and the efficiency of its use by increasing the accuracy of adjusting the technological mode g and determining the optimal life of the impeller pump impeller. equipped with three multiplexers, a display panel, two registers, two keys, an And element and an additional comparison unit, while the outputs of the first register and the flow sensor are connected to the corresponding inputs of an additional comparison unit, the output of which and the outputs of both keys are connected to the corresponding inputs of the And element, the output which is connected to the first inputs of the first, second and third multiplexers and the sixth input of the calculation unit, the vacuum sensor is connected to the input of the first multiplexer, two outputs of which Connected respectively to the seventh input of the calculating unit and to the first input of the comparison unit, the first output of the calculating unit is connected to the second input of the second multiplexer, and the second output to another input of the control unit, the first output of the second multiplexer is connected via the second register to the second input of the third multiplexer, the second the output of the second multiplexer is connected to the second input of the comparator unit, the two outputs of the third multiplexer are connected respectively to the eighth input of the calculating unit and to the display board. : 2, The apparatus according to claim 1, from which the computation unit contains four multiplication units, two division units, three summation units, an efficiency recalculation unit and a logic unit, with the outputs of the first and second multiplication units connected to the first and second inputs of the first summation unit, the output of which is connected to the first inputs of the second and third summation units, the output of the third multiplication unit is connected to the input of the first division unit, the output of which is connected to the first inputs of the second division unit and the fourth multiplication unit, the output of which is connected to the first input of the logic unit, to the second input of which the output of the second summation unit is connected, the output of the efficiency conversion unit is connected to the second input of the second dividing unit whose output is connected to the second input of the third summation unit, the output of which is connected to the second input, logic block, the combined two inputs of the second multiplication unit and the first input of the third multiplication unit being the first input of the calculating unit, the combined second input of the third multiplication unit and the first input of the block recalculating efficiency is the second input of the calculator, the third input of the first summation block is its third input / the second input of the first division block is its fourth input, the combined inputs of the first multiplication unit are its fifth input, the third input of the logic block is The second input is the second input, the second input is the eighth input, both outputs are the seventh input, and the second output is the output of the computation block — the second input of the efficiency recalculation block is laziness. FIG. 2 Source Data Variables -. Q (t.) T Q (i -z),) - (i), H (t), M (t), V (t) Constants: Of Jj C2 jj: C3-Ю2, Cb-fc-f Run -. (t + T) C /; & z-Q (t) C2; S3-Q (t) -X (t)} Zz-3 / MM-S ;, - Run: -А / СО- + З / Run: $ 6 -Ss - Vfr). Ј vSg -5f r - // Execute: 3/4 Zg with A / P-O Yes Alarms Heucnpafffccmu, disconnecting the spur mechanism i / f Run s - (- &) - /) / Ј Sfo / -0.33-sy "one Run SH $ 7-Sro i eight Run - 5/2 6 /// “S perform Sf3 Sf2 $ Ј Signalism serviceable ryust