SU740949A1 - System of automatic control of working member of stoping cutter-loader in bed profile - Google Patents

Description

integration time, the first input of the coincidence circuit is connected to one at the outputs of the electronic unit of this controller, and the second to one of the outputs of the electronic module of the other controller.

The drawing shows a block diagram of the proposed control system.

The automatic control system contains regulators 1 and 2 of the position of the executive bodies of the combine with respect to the soil and the roof of the formation with sensors 3 coal-rock boundaries, electronic units 4, units 5 for integration time and coincidence circuit 6.

Each controller separately works as follows.

From the angle 3 sensor rock, for example, isotopic, signals are sent to the electronic unit 4 to the unit 5 of the integration time.

The electronic unit 4 performs the functions of accumulating information from the sensor, deciphering at predetermined setpoints of the contents of the accumulator, and generating control commands for raising or lowering the actuator.

Unit 5 integration time, functions of reading and writing the speed of the executive body in a three-bit binary counter; after accumulating a certain number of revolutions, the setter enables the issuance of the control command generated in the electronic unit 4 with the subsequent zeroing (resetting) of both the accumulator and the setpoint generator 5.

At the output of the electronic unit 4, control commands appear for raising and lowering the actuators with a constant time determined by the integrator 5. When controllers 1 and 2 work together, the occurrence of their control commands may coincide.

If a control signal is generated at the output of, for example, regulator 1 (soil), and at regulator 2 output (there is no such signal, then signals of logical unit are sent to both inputs of coincidence 6 of regulator 1). a signal of a logical unit that zeroes three bits of the counter of the pointer 5 of the controller integration time

If at some point in time in one of the controllers, for example, 1 (soil), a control signal appears, and in the other controller 2 (roof) the specified signal is already being processed, then from the electronic unit 4 of controller 2 to the circuit coincidence 6 of regulator 1 will receive a logical zero signal.

In this case, at the output of the regulator 6 matching circuit, 1, a logical zero signal is generated, which does not nullify the third bit of the counter of the setpoint generator 5. This means that the next cycle of regulation of this regulator, i.e. regulator 1, will be shorter by a specified number of revolutions of the executive body, and the beginning of all subsequent cycles of this regulator will be shifted by the same number of revolutions relative to the beginnings of regulator 2 regulation cycles.

Thus, the control commands of both regulators will be formed with an interval of time.

The automatic control system is simplified without slowing down its speed, which allows improving not only control accuracy, but also the productivity of the shearer.

Claims (2)

1. A.A. Rudanovsky and others. On the choice of a block diagram of a regulator for automatic driving of coal-mining machines no jinacTy. Sat Automatic control of the movement of coal-mining machines, complexes and aggregates, M ,, 1970, p. 32-39 (Institute of Mining SM. A. A. Skochinsky). 2. Yarygin, B. Ye., Et al. Automatic control system for the executive bodies of the combine. Sat Shakhty automatics, Kiev, Technique, 1975, p. 10-15.