SU1218360A1 - Method and apparatus for keeping optimal ratio of linear velocities of dredge side movement and dredge bucket chain - Google Patents

Description

The invention relates to the mining industry and can be used in the extraction of mineral dredges.

The aim of the invention is to improve the accuracy of maintaining the optimum ratio of linear speeds of lateral movement and scoop

dredge chains.

Fig. 1 shows the layout of the dredge in the bottomhole; in fig. 2 is a block diagram of the device. FIG. 1 The following notation is used:

OB Rap - radius dredging;

dd and nasal distance

block;

QC) j is the distance to the coastal block;

AC f). - the length of the bow rope; ((- current angle of rotation of the dredge

from vrna zabo;

(J is the maximum turning angle

 W,

dredge ;:

(fg is the initial angle; LDAE × to the angle of deflection of the bow rope from the perpendicular to the longitudinal axis of the dredge;

YH - rope speed;

Vr. - side shift speed. no scoops;

Vr. - speed of lateral movement of the nose block.

The scoops with the scoops are from the rotation axis at the OB-Kj distance, the bow block is at the OA R distance ,.

(2)

ten

where f. - The radius of the winch drum ios ropes;

1р - gear ratio of winch gearbox;

Cd - transfer coefficient. Then with the formula (1) and (2) we finally get

CR

5 - R, K cos

()

IS

20

25

Thus, according to the proposed method, the speed feedback signal is generated by dividing the winch motor speed signal by the cosine of the angle of inclination of the bow rope from the perpendicular to the longitudinal axis of the dredge.

The method and device have high accuracy. From the circuit shown in FIG. 2f the following relations are valid: iOAC 90 - H

(four)

thirty

sit 10AC gin L dos

. AOC.)

(5) (6)

e - | Rt + R 2-R, -Rz CosLftOci C)

nuv-i owri - - -35 Joint solution C) C5), (6)

Therefore, the ratio of linear velocities j

lateral movement ys y4r

(".ChD - ™ -1-- -

V «1

Have

. „V. - 40

from Vg - Yjv

. RI

cos su)

   4Rf Rl- 2R, -Ra-co5 (()

From the diagram in FIG. 2 follows

or v

v .il

 k D

four

coStPK

; From the obtained expression, it follows that, measuring the rope speed and angle, the deviations of the rope from the perpendicular to the longitudinal axis of the dredge, uniquely determine the speed of the lateral movement of the dredge.

According to the proposed method, the device measures not the speed of the rope, but the speed of the engine of the winch of the nasal cables -, П related by functional dependence

(2)

where f. - The radius of the winch drum ios ropes;

1р - gear ratio of winch gearbox;

Cd - transfer coefficient. Then with the formula (1) and (2) we finally get

CR

5 - R, K cos

()

Thus, according to the proposed method, the speed feedback signal is generated by dividing the winch motor speed signal by the cosine of the angle of inclination of the bow rope from the perpendicular to the longitudinal axis of the dredge.

The method and device have high accuracy. From the circuit shown in FIG. 2f the following relations are valid: iOAC 90 - H

(four)

sit 10AC gin L dos

. AOC.)

(5) (6)

e - | Rt + R 2-R, -Rz CosLftOci C)

cos su)

   4Rf Rl- 2R, -Ra-co5 (()

from where

45

costfk

((f (

, .R, cos () o-Vj

(eight)

has the appearance

50

eight.

R, -Rj (Vm- ti o-t "l; A R Rj-2R, - (j-cos ((j) i |) o-V)

L9)

55

By comparing this expression for o (with expression (8) for cos ifj (, we get

CR

R,

(ten)

It follows from the above that the graph of the change in costf during the movement of the dredge around the face at a certain scale is a measurable graph. “5. Therefore, in a methodological sense, the error of the proposed method compared to the prototype is zero.

The proposed method and device for automatically maintaining an optimal ratio of linear speeds of lateral movement and digging have a higher accuracy of measurement.

Measuring the angle of deviation of the nasal cable from the perpendicular to the longitudinal axis of the dredge and using the cosine of this angle to generate a feedback signal along the linear velocity of the lateral movement of the dredge, as well as having a sensor for the angle of inclination of the nasal cable from the perpendicular to the longitudinal axis of the dredge and the functional unit ensure that set goal

I

The device contains an electric inverter i, a winch motor of the new ropes 2, a dredge 3, a tachogenerator of the scoop chain engine 4, a current cut-off unit 5, an engine of the scoop chain 6, the multiplying unit 7 the tacho generator of the nasal winch motor 8, the nasal deflection angle sensor rope from the perpendicular to the longitudinal axis of the dredge 9, functional converter 10, dividing unit 11, dredging radius sensor 12, adder 13, with the output of the adder 13 connected to the input of the electric converter 1 of the winch motor of the nasal ropes 2, and The input of the adder 13 is connected to the output of the tachogenerator 4 of the scoop circuit 6, the second input is connected to the output of the current cutoff block 5 protecting the winch motor of the IOT overhead load ropes, and the third input is connected to the output of the multiplication unit 7 whose first input is connected to the output of the tachogenerator 8 of the winch motor of the nasal ropes, and the second input - with the output of the dividing unit 11, one of the inputs of which is connected to the output of the dredge radius sensor

15

183604

12. The output of the sensor of the angle of inclination of the nasal cable from the perpendicular and the longitudinal axis of the dredge 9 is connected to the input of the functional converter 10, the output of which is connected to the second input of the dividing unit 1.1.

As a sensor for the angle of inclination of the nasal cable from the perpendicular to the longitudinal axis of the dredge, for example, a precision potentiometer is used, which is connected with the rotatable holder of the nasal unit.

The method and device operate as follows.

The input element of the comparison 13 of the electric transducer 1 of the winch motor of the nasal ropes is supplied with a driving signal from the tachogenerator of the scoop circuit A motor. At the same time, the winch motor of the nasal ropes 2 is turned on and the dredger Z. is rotated. torus 8, the signal from which serves.

to the input of the multiplication unit 7 (U pd-g

 LA /

The signal from sensor 9 is fed to a functional converter 10, 30 whose output signal (jIg is proportional to the cosine of the angle of inclination of the bow rope from the perpendicular to the longitudinal axis of the dredge, i.e. c. ||. The signal from the output of block 10 is fed to one of the inputs of the division unit 11 to the second input, which is supplied from the output of the dredging radius 12 sensor. At the output

20

25

35

5 division blocks I 1 receive a signal

AND".

40

45 A signal from the output of dividing unit 11 is fed to a second input of multiplication unit, to the first input of which it supplies a signal from tachogenerator 8. At the output of multiplying unit 7, a signal is obtained that is proportional to the linear velocity of the lateral movement of the dredge.

R

.K coecf /

The signal from the output of multiplication unit 7 is fed as a negative feedback to the input of an element compared to

13. Comparison element 13 compares the Dani's signal from the tachogenerator 4 of the scoop circuit engine with the feedback signal from the output of the multiplier 7, while automatically maintaining the optimum ratio of the linear velocities of the lateral movement and the scoop dredger circuit. Improving the accuracy of the automatic maintenance of the ratio of the linear speeds of lateral movement and scoop is ensured by

that the feedback signal on the linear velocity of the lateral movement is formed continuously by

and the signal of the speed of the winch motor of the nasal ropes to a signal proportional to the cosine of the angle of inclination of the nasal cable from the perpendiculars of the pa-ramp to the dredge axis.

At the same time, the accuracy of napkins, scoops, elevation of Gs is increased by 5%, the dredge capacity is eliminated, the modes of work of the lateral shear are eliminated, the performance of the nasal ropes is improved,

fpue.i

Compiled by K. Lukashanets Editor M. Gorvat Tehred L. Mikesh Proofreader A.

Order I130 / 55 Circulation 642 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch GShP Patent, Uzhgorod, st. Project, 4

fig.g

Claims (2)

1. A method for automatically maintaining the optimal ratio of linear speeds of lateral movement and scoop chain of the dredge, based on measuring the linear speed of the scoop chain, forming a linear speed of lateral movement of the dredge by measuring the speed of the winch engine of the nasal ropes and the dredging radius, comparing these linear speeds and according to the results of comparison maintaining their optimal ratio, characterized in that, in order to maintain accuracy, form a linear speed of lateral movement of d Steps considering measurements of the cosine of the angle of deflection of the nose of the rope from the perpendicular to the longitudinal axis about dredge and multiplying the engine rotation speed winch nasal ropes on the quotient of the radius of dredging by the cosine of the deflection angle of the nose of the rope from the perpendicular to the longitudinal axis of the dredge. 2. A device for automatically maintaining the optimal ratio of linear speeds of lateral movement and the dredger scoop chain, containing a tachogenerator of the scoop chain engine, the output of which is connected to the first input of the element — _from that comparison, the output of which is connected ® to the input of the electric drive of the winch • engine and the second input - _: with the output of the current cut-off unit, the tachogenerator of the engine of the winch of the nasal ropes, the multiplication unit, • the division unit and the upholstery radius sensor, characterized in that it is equipped with an angle sensor deviations of the nasal rope from the perpendicular to the longitudinal axis of the dredge and the functional converter, while the output of the angle sensor of the deviation of the nasal rope from the perpendicular to the longitudinal axis of the dredge is connected through the functional converter to the first input of the division unit, the second input of which is connected to the output of the dredging radius sensor, and the output is with the first input of the multiplication block, the second input of which is connected to the output of the tachogenerator of the engine of the winch of the nasal ropes, and the output is with the third input of the comparison element.