SU1587192A1 - Automatic regulator of mining machine load - Google Patents

Abstract

The invention relates to the mining industry and is intended to automatically control the operating modes of the drive of the mining machine. The goal is to increase the resource of the mining machine by reducing the dynamic loads. For this, the controller contains sensors 1.8 and setters 7.18 of load and speed of electric motors (ED) 2, amplitude selector 3, elements 4, 14 of comparison, comparators of overload 5.6 and speed 9, key 10, pulse element 11, integrator 12, an output amplifier 15, a single vibrator 7, a direction selection device 18, and a thyristor converter (TP) 16. The latter controls ED 19, which moves the combine 21 through the mechanism 20. Load sensor 1, selector 3, unit 7, reference element 4, pulse Element 11, Integrator 12, Element 14 Comparison, TP 16 and ED 19 They maintain the specified feed rate (JV) value of the combine 21 when the load on the ED 2 is lower than the value specified by the setting unit 7 or the SP decrease of the combine 21 is proportional to the difference between the current and set load values. The comparator 5, the comparison element 14, the TP 16 and the ED 19 provide for the reduction of the SP of the combine 21 to a full stop when the load on the ED 2 of the first predetermined threshold is exceeded. The comparators 5, 6 and 9, the one-shot 17, the device 18 for selecting the direction, the key 10, the reference element 14, the transformer substation 16 and the ED 19 ensure that the combine 21 stops and briefly reverses its movement when the load on the ED 2 of the second preset threshold is exceeded. 8 il.

Description

The invention relates to the mining industry, namely, to devices for automatically controlling the operating modes of the drive of mining machines.

The aim of the invention is to increase the resource of a mining machine by reducing dynamic loads.

The drawing shows a functional diagram of an automatic load controller of a mining machine.

The automatic load controller of the mining machine contains load sensors 1 of electric motors 2 connected to an amplitude selector 3, the output of which is connected to the first inputs of the first comparison element 4 and the first 5 and second 6 overload comparators, the load setpoint 7, the output of which is connected to the second inputs of the first element 4 comparisons of both the first 5 and the second 6 overload comparators, a speed sensor 8 connected via a speed comparator 9 to a third input of the overload comparator 6. The output of the overload comparator 5 is connected to the first input of the key 10. The output of the first comparison element 4 is connected via pulse element 1 and integrator 12 to the second input of the key 10, the output of which and the output of the speed setpoint 13 are connected respectively to the first and second inputs of the second comparison element 14. The output of the second comparison element 14 is connected via the output amplifier 15 to the first input of the thyristor converter 16. The output of the second overload comparator 6 is connected via one-oscillator 17 to the control input of the switch 10 and the input of the direction selection device 18, the output of which is connected to the second input of the thyristor converter 16. The thyristor converter 16 controls the electric motor 19, which, through mechanism 20, moves the combine 21.

The key 10 comprises a transistor 22 and two resistors connecting the collector of the transistor 22 to the inputs of the key 10.

The directional selector 18 comprises keys of directional toggle switches 23 and 24, two transistors and five resistors.

The automatic load controller operates as follows.

The signals from load sensors 1 are sent to an amplitude selector 3, where one chooses the largest in amplitude. From the amplitude selector 3, the signal arrives at the first comparison element 4, at the overload comparators 5 and 6, where the comparison and the signal of the load regulator 7 arrive.

The error signal from the comparison element 4 5 commutes with the input of the integrator 12 with the constant frequency of the pulse element 11.

In the case of a positive mismatch voltage of the comparison element 4 (non-loading of the electric motors 2), the zero voltage at the output of the integrator is 12. With a negative voltage error (motor overload), the output voltage of the integrator 12 increases to the value of the supply voltage. Through the second input of the key 10, the voltage of the integrator (transistor 22 is closed) is supplied to the second comparison element 14, where it is compared with the voltage of the speed setpoint 13. The resulting output voltage of the corrected speed reference of the output amplifier 15 is fed to the thyristor converter 16. The control system of the thyristor converter sets the thyristor control pulses at an angle corresponding to the output voltage of the speed reference. But the voltage on the thyristors is supplied only after the occurrence of the voltage of the direction setting from the direction selection device 18. When the mining machine operator turns on one of the toggle switches 23, 24 "Right, Left, the output of the direction selection device 18 appears to set the direction of the corresponding polarity. The thyristor converter 16 supplies the voltage to the displacement motor 19. 55 Under the action of the traction force developed by the electric motor 19 through the movement mechanism 20, the combine 21 moves in a predetermined direction and the cutting electric motors 2 are loaded with the torque required 1587192

56

in order to overcome the resistance of the charger 5 overload at the first input to the cutting Pro ™ of the comparison element 14. The output for Since the electric motor is underloaded, the corrected task of the cattle houses 2 at the output of the integrator 12 of the zero-ness, Uykhas, is restored. One of

voltage, then the output voltage of the high-speed transistors of the device for selecting the directional speed reference U. «x. W Bottom, whose collector will be connected

fully corresponds to the pre-set voltage U "; the toggle switch 23 or 24, the pickup of the 13 speed. also closes the polarity of the output voltage. When the electromotors 2 are overloaded, the direction selection device 18

The voltage at the output of the sensors 1 is more than the opposite. Thyristor

directors setpoint 7 load. Voltage 0 converter 16 will turn on the electric motor misalignment at the output of the element 4tel 19 for reversing the given

comparison is negative. Voltage in-speed movement. The combine 21 from the grower 12 increases. On the second one, from the bottom. At the end of the pulse

the comparison 14 against the voltage of the one-vibrator 17 key 10 and the device 18

Speed sensor 13 is subtracted. Direction voltage 5 is returned to the co-integrator 12. That was not before the slave. The output voltage of the one-vibrator 17 was corrected. Electromotive speed setting and, therefore, the movement body 19 stops if

the speed of movement of the combine fall. On-overload persists, or deploys load on electric motors 2, decreases and, s in the direction specified by the operator, when

when the voltage at the output of the sensors 1 bu-20 disappears overload, det is equal to the voltage of the setpoint 7 of the load,

Claims (1)

the voltage of the integrator 12 will cease Formula of invention change and, consequently, the speed of the motor-automatic load regulator of the burn of the combine 21 becomes such that the machine containing the load sensors, the load of the electric motor 2 corresponds to 25 connected to the amplitude selector, the voltage of the setpoint 7 of the load. The output of which is connected to the first inputs In case of motor overload, overload comparator and the first element at which the voltage from current sensors is compared, the load master connected becomes higher than the first overload level, the second inputs of the overload comparator overload comparator 5 are triggered and through the first comparison element, the output of the first key input 10 Element of which is connected to a pulse element, the comparison element 14 will receive a voltage, a speed sensor connected to a comparator greater than the maximum voltage given by the speed master, settings speed, the second element snip speed. The output voltage of the comparison second, the one-shot and the output of the comparison element 14 of the Uvcc.sub.c reduces the amplifier, characterized in that, with a goal with to zero. The thyristor converter increases the resource of the mining machine at the expense of 16 translates the electric actuator 19 into a mode 35 for reducing dynamic loads, it is supplied with deceleration to a complete stop. When the integrator, key, other load of the electric motor 2 is reduced by the overload, the selector device, the comparator 5 and, therefore, the direction and thyristor converter, the output voltage is corrected, and the first and second inputs of the speed key Uew .jc The recovery is connected respectively to the output of the com- puter of the overload and the output of the integrator, the input of which is connected to the output of the device. If the load on one of the electrically-pulsed element, the first and second drivers of the inhalers 2 will become larger than the second level of the second comparison element are connected the overload occurs, then at the beginning there is a stop, respectively, with the output of the key and output of the combine under the influence of the comparator-45 TO the speed control unit, the output of the second eletator 5 of the overload, the voltage across the terminal through the output amplifier the speed sensor 8 becomes equal connected to the first thyristor input zero, the speed 9 comparator will work and, the converter, the first, the second, and the load on the electric motors will not become the inputs of the other comparator overload less than the second overload level after connected, respectively, with the output of the amostanov combine, then the comparator 50 of the fine selector will work, the output of the setpoint generator 6 overload. One-shot 17 at the set-load and speed comparator output, The time, which is given by its parameters, supplies the second comparator of the overload to the output; the voltage is unlocked to the switch 22 of the switch via the one-oscillator with the control 10 and the transistors of the device 18 selection on the input of the key and the input of the device of choice board The transistor 22 of the zero-direction switch 10, the output of which is connected to the supply voltage of the integrator 12 and the com- part of the thyristor converter.