SU831967A1 - Safety winch automatic control device - Google Patents

Description

(54) DEVICE FOR AUTOMATIC CONTROL OF SAFETY WINCH

one

The invention relates to the mining industry, namely to devices for automatic control of mining machines on inclined fall formations.

A device for automatic control of a mining machine is known, comprising an electric motor, a safety cable tension sensor, limit switches and a system of levers W./

However, this device is rather cumbersome and does not provide for the shutdown of the electric motor during normal cable tension.

It is also known a device for automatic control of a safety winch, comprising an electric motor with control circuits, a hydraulic pump, a hydraulic crank and hydraulic lines, a tension sensor for the safety rope, and others.

However, the known device is complicated in design and requires a constant start of the electric motor.

The purpose of the invention is to simplify the design of the device while ensuring that the motor is disconnected during normal tension of the safety rope.

This goal is achieved by the fact that the device is equipped with a hydraulic cylinder with a sensor for the end positions of its rod, the piston and rod of the cavity of the hydraulic cylinder connected to hydraulic lines of the hydraulic pump, and sensors for the end positions are included in the motor control circuits. FIG. 1 shows a block diagram

10 of the proposed device; in fig. 2 embodiment of the device for automatic control of the electric motor of the safety winch.

15 A device for automatic control of a safety winch consists of a winch 1 mounted on a hydraulic drive, including a hydraulic pump, a hydraulic motor and a hydraulic axle. base 2, on which the hydraulic cylinder 3 and two end position sensors are mounted on reed switches 4 and 5, located at a distance from each other on the axis of the hydraulic cylinder

25 - under the extended rod b of the piston 7 and connected to the magnetic starter 8 via the control unit 9. At the free end of the rod, a permanent magnet 10 is rigidly fixed. 10. Pipelines

30 11 and 12 hydraulic cylinders 3

with hydraulic pipelines (not shown in the figures). The winch also includes a drum 13, a gearbox 14, a hydraulic actuator 1 and an electric motor 15.

The device works as follows.

Let the piston 7 of the hydraulic cylinder 3 initially be in the middle position and, consequently, the magnet 10 between the reed switches 4 and 5 (in FIG. 2).

When the mining machine moves upward, the winch rope weakens, the oil from hydraulic drive D goes through pipeline 11 to the rod end of cylinder 3. Piston 7 and magnet .10. move left. At a certain degree of weakening of the rope, the magnet 10 is installed above the reed switch 4 (the position of the magnet is shown by a dotted line). The reed switch 4 under the action of a magnetic field closes its contact and, acting on the remote control circuit of the magnetic starter 8, switches on the hydraulic drive of the winch to the winding of the rope. The rope, winding on the drum 13, increases the force applied to the hydraulic drive of the winch. As a result, the pressure in the rod end of the hydraulic cylinder 3 decreases, while in the piston cavity it increases. This causes the piston 7 and magnet 10 to move to the right. The magnet moves away from the reed switch 4, its contact is opened and the winch is turned off by the magnetic starter 8. Further operation of the device when the coal mining machine moves upwards is similar to that described.

. When the coal-mining machine moves downward, the rope pulls up and oil from hydraulic drive 1 enters hydraulic cylinder 3 via pipeline 12. As a result, pressure increases in the piston cavity of hydraulic cylinder 3 and decreases in the right-hand side. This causes the piston 7 and magnet 10 to move to the right. At a certain tension of the rope, the magnet 10, moving to the right, approaches the reed switch 5, which, under the action of a magnetic field, closes its contact and, acting on the remote control circuit of the magnetic actuator 8, turns on the lebad. KU on the unwinding of the rope.

Reducing the tension of the rope causes the piston 7 to move to the left (for example, when the combine is jammed

in the lava when going down). This leads to the movement of the magnet 10 to the left, to the opening of the contact of the reed switch 4, and to the disconnection of the winch. With a further increase in the tension of the rope, the winch is turned on again and the cycle is repeated.

The present invention simplifies the design of the device, reduces the complexity of the control, providing

energy savings.

Claims (2)

1.Patent of Poland No. 57732, cl. In 66 In 22/04, published. 1969. 2. USSR Author's Certificate No. 301441, cl. E 21 C 33/00, 1969. 7 / I L12