SU63876A1 - Device for remote control of electric drive of the cutting machine and its winch - Google Patents

Description

The object of the present invention is a device for remote control of a trill by electric motors of an electric motor of the ironcutter machine and its winch, by means of which the cutting machine is fed on a steep fall.

The winch with a self-braking worm gear, installed on the upper drift, has two asynchronous motors: MLA (forward motor) for feeding at the cutting machine cutting speed, and MLN (winch motor backwards) for lowering the maschine (see drawing). Both engines have the same number of pole pairs, but a different gear ratio from the motor shaft to the winch drum shaft. If both engines operate on a common shaft, then, in the case, the MRL must have a greater number of pole pairs than MLN in order for the descent to occur at a higher speed than the ascent. The use of two motors to drive the winch eliminates the need for manual translation to change the direction and speed during the transition from the work to the descent of the machine, as well as the associated

with manual translation, the driver moves up and down the lava.

In the proposed device, control of the engine MLV in the cutting edge and engine MLN is carried out according to the pressure diagram (see drawing) with one common wire

The switching-on motor of the supply motor is switched on with the time relay RV included in the control circuit of the magnetic starter motor of the cutting machine, thanks to which, the control of the feed motor does not require additional cores in the six-core cable leading to the cut-in side. At the same time, the operation of the maschine is facilitated, since the feed is always switched on after the cutting chain has been running for a few seconds.

When you press the “forward” button, the relay PI is triggered, the contacts of which close the contactor circuit K to the cutting edge MB motor.

At the same time, the RV time relay is turned on, which after a few seconds closes its contacts in the RPV relay circuit, and this last, in turn, turns on the contactor B of the MV motor. So

Thus, when the forward button is pressed, the cutting machine engine first turns on, and in a few seconds the feed winch engine is turned on.

To descend the machine, you must press the back button (descent). This includes the on-load tap-changer relay and the engine contactor H MLN.

If it is necessary to switch on one end of the circuit for a long time, the "study" button is pressed. This includes the relays Pb PB, RPT and RPY.

Since the contactors B and H are interlocked in such a way that they cannot be switched on at the same time, both of them will remain off, and only the contactor K of the main actuator will be turned on: 1 machines.

To disable it, use the “stop” button.

Accidentally pressing the button "back when the machine is running is similar to the action when pressing the button." Study.

This scheme can be used to implement the automatic control scheme.

feed rates depending on the engine load of the cutting-edge machine with the help of current relays RT, whose contacts are located in the circuit of the RPT relay; RT relays disconnect the feed winch during an overload and turn it on when underload.

At the same time, in order to obtain a smooth adjustment over a wide range, the MLP engine may have a phase rotor with resistance introduced into the rotor circuit.

In the absence of an automatic regulator of the feed rate, the motor is a short-circuit and short-circuit current transformers and current relay PTs are excluded from it.

The proposed scheme makes it possible to control the winch fully remotely (including the transition from the working stroke to the descent), which allows the winners to be removed. All control is carried out using a single six-core cable, and as noted above, it is also possible to control the feed rate automatically.

The diagram additionally shows: 1 РМТ, 2 РМТ and 3 PA-IT-thermal motor relays, Tp-transformer for power supply of the control circuit, КРВ - reversing contactor of the MB motor.

Subject invention

The device for remote control of the electric machine of the iron machine and its winch, consisting of three electric motors, one of which serves to drive the chain cutters of the machine, the other for feeding during the working stroke of the machine and the third for lowering the machine, using, first, magnetic starter containing motor starting contactors, instantaneous relay for turning on the motor-vehicle contactor, time relay for subsequent switching on the supply motor contactor and instantaneous relay for turning on the motor contactor the descent, and, secondly, the button station with the buttons "stop," forward (for turning on the first two of the indicated relays) and "back (for turning on the third relay) connected to the actuator by a three-wire communication line, characterized in that The purpose of the individual switching on of the motor of the electric machine without increasing the number of wires of the communication line, the button station is equipped with a double button, a shunting button "forward and back" and serving to simultaneously turn on all of these relays, and in the winding circuit of the contactor. “A normally closed block contact of the motor cut-off contactor relay is located back.