SU426222A1 - DEVICE FOR STABILIZATION OF SPEED OF SUPPLY AND LOAD OF ELECTRIC MOTOR OF THE EXTRACTING MACHINE - Google Patents

Description

one

The invention relates to the coal industry and is intended to stabilize a given load value of an electric motor of an executive body by automatically changing the feed rate of the excavation machine, as well as stabilizing the feed rate if the electric motor of the executive body is not overloaded.

Devices for controlling a excavation machine are known, comprising a load sensor, a speed sensor, an adjustable reference voltage source, a phase-sensitive device, a switch with a pulse amplifier, an electromagnet, a control valve with a hydraulic lock and a servo drive.

The proposed device for stabilizing the feed rate and load of the excavation motor is characterized in that the control circuits of a transistor switch connected in series with an adjustable reference voltage source are connected to a blocking generator, the input of which is connected to a phase-sensitive device controlled by a load sensor, and the output of the transistor the key is connected through a three-position switch with the inputs of the comparator and the logic element "And with the inverter, the second input of which is connected with the output of the clock generator, and the outputs of the element “And with the inverter” through series-connected elements “I” and the pulse amplifiers are connected to the input of the element “ii -lll-PE, the output of which is connected to the second inputs of the elements“ I.

The drawing shows a block diagram of a device for stabilizing the feed rate and the load of the excavator motor.

The device for stabilizing the feed rate and the load of the electric motor of the excavation machine 1, the actuator of which is driven by an electric motor, consists of a hydraulic motor 2, a variable-capacity hydraulic pump 3, a hydraulic servo drive 4, a hydraulic lock, auxiliary control pump b, a bath 7, a speed sensor 8, the source of the reference reference of the voltage of 9, phase-sensitive devices 1 and 10, switches 11 and 12, pulse amplifiers 13 and 13, electromagnets 14 and 14, the logical element "ILP-PE 1 5, And 16 and 16 logic elements, And 17 logic element with an inverter, a clock generator 18, a load sensor 19, sources 20, 21, respectively, sawtooth and smoothed reference voltages, a blocking generator 22, a transistor switch 23.

In the mode of stabilization, the speed of the cutter of the excavation machine 1, whose executive engine is driven by an electric motor, moves the machine along the bottom during the excavation process by means of 1 hydraulic motor 2, which is powered by a variable displacement hydraulic pump. J pump performance is determined by the hydraulic motor servo 4 (the position of the large stator of the hydraulic pump), which, in turn, is controlled by a hydraulic lock 5. The hydraulic lock 5 and the servo drive 4 are powered by the auxiliary control pump 6. The initial fluid flow is drained into the bath 7.

11In the movement of the excavation machine along the bottom of the speed sensor 8, an output voltage proportional to the speed of movement of the excavation machine is removed, and compared with an adjustable reference voltage proportional to the predetermined feed speed 1..

The adjustable reference voltage is set by the driver on the remote control of the slot machine (speed master). The result of the comparison is fed to a phase sensitive device 10 sensitive to the polarity of the input signal. In the case when the output voltage of the speed sensor 8 is higher than the reference, the specified device 10 outputs a signal through the switch AND to the pulse amplifier 13 or 13 depending on the eccentricity sign (one direction or the other from the zero position) of the hydraulic pump stator. The switch 11 is kinematically coupled to the stator of the hydraulic pump and therefore automatically switches when the stator of the hydraulic pump passes through the zero position. From the output of the pulse amplifier 13 or 13, the voltage is applied to an electromagnet 14 or 14, kinematically connected to a hydraulic control spool that controls the hydraulic lock 5.

When the electromagnet 14 is triggered, the hydraulic lock 5 opens, and the fluid from the control pump enters the servo 4. In this case, the hydraulic pump stator moves to the right, reducing the pump performance and, therefore, the feed rate. In the case where the adjustable reference voltage is higher than the output voltage of the speed sensor 8, the device 10 does not emit a signal to the pulse amplifier 13, the electromagnet 14 turns off and closes the hydraulic lock 5. The reduction in the feed rate is stopped. As soon as the input signal to the pulse amplifier 13 stops, the logical element "OR-PE 15 will generate a signal to the input of two elements" AND 16 and 16. The second input signal to these elements comes from the logical element 17.

The output signal from the element 17 is in the case if the input voltage comes from source 9 through a transistor switch 23 and switch 12, as well as from the clock generator 18. Element 17 is designed so that, depending on the polarity of the input signal from source 9, gives out

the signal is either on the element “And 16, or on the element“ And 16.

The polarity of the input signal on the element 17 coming from the source 9 is determined by the position of the switch 12. The position of the switch 12 determines the direction of movement of the machine and is therefore determined by the driver. In this case, the output signal from the element "And 16 is fed to

a pulse amplifier 13, and the output of the latter includes an electromagnet 14, kinematically connected with a hydraulic control spool. The lock 5 opens in such a way that the liquid is released from the servo 4 to the bath. In this case, there is an increase in productivity of the hydraulic pump 3 and, consequently, the feed rate. In the mode of stabilizing the load of the electric motor of the executive body, the load 19 is relieved of a voltage proportional to the load of the electric motor rotating the executive body, compared with the voltage obtained as a result

addition of smoothed reference and sawtooth stresses. The result of the comparison is fed to a phase sensitive device 10 sensitive to the polarity of the input signal. When the excavator motor overloads, the device 10 turns on the blocking generator 22, and the latter, in turn, turns off the transistor switch 23. When the switch 23 is turned off, the source of the adjustable reference voltage 9 is

disconnected from element 17 and the device comparing this voltage with the output voltage of the speed sensor 8.

The signal from the speed sensor 8 is supplied to the device 10, then to the amplifier 13 and the electromagnet 14. As a result, the feed rate decreases. As soon as the voltage taken from load sensor 19 becomes lower than the reference voltage, device 10 will turn on the blocking generator 22, and the last

will turn on the transistor switch 23.

In this case, the adjustable reference voltage will be higher than the output voltage of the speed sensor 8, therefore the electromagnet 14p will turn on and the speed will increase

filing.

The transition from the stabilization of the motor load to the stabilization mode of the feed rate occurs automatically.

Subject invention

Device for stabilizing the feed rate and load of the excavation motor, comprising a load sensor, a speed sensor, an adjustable reference source

voltage, phase-sensitive device, a switch with a pulse amplifier, an electromagnet, a control valve with a hydraulic lock and a servo actuator, characterized in that, in order to increase the reliability of the device, it contains a blocking generator, logic elements "AND, OR-NOT," AND with an inverter, a clock generator and a transistor switch connected in series with an adjustable voltage source, the control circuit of the switch is connected to a blocking geerator, the input of which is connected to a phase-sensitive device controlled by m load sensor, and the output of the transistor switch is connected through a three-position

a switch with the inputs of the comparator and the logic element "And with an inverter, the second input of which is connected to the output of the clock generator, and the outputs of the element" AND with the inverter through the serially connected elements "AND and the pulse amplifiers are connected to the input of the element" OR NOT, whose output associated with the second inputs of the elements "I.

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