SU1296500A1 - Device for controlling drive of mine hoisting machine - Google Patents

Abstract

This invention relates to a mine hoist and can be used to control the brake of a mine hoist and winches. The purpose of the invention is to improve the accuracy of control and expand the functionality of the device. The device comprises a lifting machine I connected to a speed sensor 2, an operating braking controller 3 and a safety braking controller 4. The braking controllers 3 and 4 consist of elements of comparison 5. 2 Il. h p (C (L you; o 05 O1 FIG.

Description

The invention relates to a mine hoist and can be used to brake a hoist of mine hoists and winches.

The purpose of the invention is to improve the accuracy of control and expand the functional capabilities of the device.

FIG. 1 shows a diagram of the device; in fig. 2 is a graph showing the time variation of the actual and set speed of the hoist generated by the respective blocks of controllers.

The device consists of a lifting machine 1 connected to the speed sensor 2, the operating braking controller 3 and the safety braking controller 4. The operating 3 regulators and safety braking 4 consist of comparison elements 5, the direct inputs of which are connected to the output of the speed sensor 2 and inverse - with the outputs of the summation elements 6. Some inputs of the elements of the summation 6 of the controllers of the working 3 and safety 4 braking are connected to the corresponding, they outputs of the blocks 7 of the formation of the laws of speed reduction in and the second - to the corresponding outputs of blocks 8 of the formation of the law of increasing speed over time. The outputs of the elements of comparison 5 are connected respectively with inverse inputs of the blocks 7 forming the law of decreasing velocity over time and with one inputs of the blocks 8 forming the law of increasing velocity over time. The second inputs of the blocks 8 are connected to the controllers of the maximum possible acceleration of the lifting machine, and the second inputs of the blocks 7 are connected to the controllers of the given slowing down of the lifting machine.

The output of the comparison element 5 of the operating braking controller 3 is connected to the input of the summation element 9, the second input of which is connected to the output of the manual brake control unit 10. The output of the summation element 9 is connected to the input of the operating braking drive 11, the output of which is connected to the first input of the electromechanical switch 12, the output of which is connected to the mechanical brake 13. The output of the comparison element 5 of the safety braking regulator 4 is connected through the driver 14 to the input of the And 15 element, the second the input of which is connected to the output of the relay 16 of the safety braking and control of its input of the electromechanical switch 12, and the output through the safety braking drive 17 is connected a second input of the electromechanical switch 12.

The blocks 8 of the controllers of the working 3 and safety 4 braking form the laws of the speed increase in time in the presence of signals from the outputs of the elements of comparison 5 corresponding to Ud-O O, where

t LI

Od - the value of the actual speed; UZ - the value of a given speed.

The laws of increasing speed over time are determined by

Y, (t) y .. + 5 a, dt,

ti

where ay is the maximum possible acceleration of the lift of the lifting machine for regulator 3 or the maximum possible acceleration of free run-down of the lifting machine for controller 4;

Uz (1) - the value of the increase in a given speed over time;

Oud; - the value of the actual speed at the time of the signal at the inputs of blocks 8;

The moment of switching time, i.e. the time of occurrence of the signal from the output of the element of comparison 5 Ud-Uz 0; i is the sequence number of the switch. Blocks 7 form the laws of speed reduction in time in the presence of signals from the outputs of the elements of the comparison 5 corresponding Ud - UZ; 0. The laws of speed reduction in time are determined.

Q 5 0

five

0

five

0

five

ysc (t) y ,,.,

V

where Uz (1) is the magnitude of the reduction in the given speed over time; the maximum possible deceleration of the hoisting machine for the regulator 3 or the base (set delay of the hoist during safety braking for the regulator 4);

the magnitude of the actual speed at the time of the signal at the inputs of blocks 7; switching time, i.e. the time of the signal from the output of the element of comparison 5

V. - Y, 0;

switch order number.

Blocks 6 perform algebraic summation of input signals. On their way out

W.-t; J

dah a given speed law signal is generated

U:, (1) Uz., (1) + Uzs (1).

The operation of the controllers for operation 3 and safety 4 braking with broken connections of the outputs of the controllers for elements 9 and 15 is illustrated in FIG. 2, where: 18 - the laws of increasing speed over time; 19 - the laws of speed reduction in time; 20-23 show the trajectories of the change in the actual speed of the lifting machine, respectively.

but: 20 - during acceleration of the hoist and braking with acceleration and deceleration, not exceeding the laws of increase and decrease in speed over time; 21 - the same, with a decrease in the actual speed to zero; 22 - when braking a hoist with a slowdown, exceeding the law of decreasing speed over time; 23 - during acceleration of a lifting machine with acceleration, exceeding the law of increasing speed over time; 24-27 - the laws of change of the signals at the outputs of the elements of the comparison of the regulators with the corresponding trajectories of the change of the actual speed.

The manual brake control unit 10 outputs a signal proportional to the angle of rotation of the control handle.

Comparison element 9 performs the algebraic summation of the manual control signal and the service braking control signal 3.

An operating braking drive unit 11 and a safety braking drive unit 17 convert control signals into signals controlling a mechanical brake 13.

Shaper 14 generates control signals for AND 15, depending on the output signal of the comparison element 5 of the safety braking controller 4:

G "1 when Vd - Oz O (" O when Ud - UZ O

The output of the safety braking relay 16 sends a signal to an electromechanical switch 12, which switches the mechanical brake 13 from the operating braking drive 11 to the safety braking drive 17, allowing the signal from the regulator 4 to pass to the mechanical brake 13.

The device works as follows.

In the working braking mode when the hoist is moving with acceleration (deceleration) a within the range; hell; ay, the signal from the output of the element of comparison 5 of the control braking 3 is equal to O, since the law of change of the actual speed almost coincides with the law of change of the given speed (Fig. 2).

When the lifting machine moves with an acceleration-deceleration greater than a given one, a signal is generated at the output of the comparison element 5, which acts on the brake of the lifting machine.

In the first case, this signal leads to an increase in the braking force on the lifting machine, and in the second case, to its decrease until the signal from the reference element 5 becomes zero.

In the safety braking mode, the contact of the safety braking relay 16 connects the safety braking drive 17 to the mechanical brake 13. The safety torch drive

17, according to the signal from the comparison element 5, the safety braking controller 4 regulates (increases) the braking force until the hoisting machine slows down by a value equal to the preset one. When Ud - U O at the output of the imager 14, the signal "O" causes stopping of the growth of the braking force and the lifting machine will decelerate with steady deceleration adz. When the zero speed is reached at the output of the former 14, the signal "1" appears, which leads to an increase in the braking force to the maximum value stopping the elevator machine.

15

Claims (1)

Invention Formula 0 five 0 0 five A device for controlling the drive of a mine hoisting machine, comprising a mechanical brake acting on the drive of the hoist machine, to which the actual speed sensor is connected, the output of which is connected to the inputs of the comparison control elements of the working and safety braking, the outputs of which are connected to the inverse inputs of the corresponding reduction law formation units speeds in time, the second inputs of which are connected to the controllers of a given slowdown of the hoist, and the output of the comparison element p the service braking horn is connected to the input of the summation element, the second input of which is connected to the manual brake control unit, and the output of the summation element is connected to the input of the working braking drive, the output of which is connected to one of the electromechanical switch inputs, the second and third inputs of which are connected respectively to the contact safety brake relay. The output of the safety braking drive, wherein the output of the electromechanical switch is connected to the input of the mechanical brake, characterized in that, in order to increase the control accuracy and enhance the functionality, it is equipped with an AND element and setpoint accelerators of the lifting machine, and safety braking units are introduced for forming the law of increasing speed over time and summation schemes, some of the inputs of which are connected to the outputs of the corresponding x blocks forming the law of speed reduction in time, and the second with the outputs of the blocks forming the law of increasing speed over time, the first inputs of which are connected to the corresponding setting devices of the maximum possible acceleration of the lifting machine, and second to the outputs of the corresponding comparison elements, the inverse inputs of which are connected to Outputs corresponding entered 5 summation circuits, whereby the output of the comparison braking controller comparison element through the driver is connected to one of the inputs of the AND element, the second input of which is connected to the contact of the relay of safety braking, and the output of the element I is connected to the input of the drive of safety braking. 2 J9