SU1426933A1 - Apparatus for controlling electric drives of cable drums of grapple-type crane - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to lifting and transporting electrical equipment for cranes. The purpose of the invention is to increase the convenience of operation, atacin. The device contains sensors 20 and 21 of forces in the cargo rope, connected through blocks 23 and 24 of force limitations to the input of systems 3 and 4 of automatic control of electric drives. In the scooping mode, the block 23 limits the force in the lifting winch at the level O, I of the nominal force, while the lifting winch does not prevent the grapple from penetrating into the ground. 1 h, para. f-ly, 1 ill. with ifi

Description

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The invention relates to lifting and transport equipment, namely, devices for controlling electric drives of cargo winches grab cranes.

i The purpose of the invention is improved convenience in use. The drawing shows a block diagram of the proposed device,

The device contains the setpoint 1 slave); Ie connects to the input of the pe1 of the tors 2 speeds of systems 3 and 4; automatic control of the electric actuators. Regulators 2 are connected to the iio.ei control of the transducer converters; Rotor drives powered by electric motors; whether 7 Hg 8 lifting and closing Cr

The speed reference is fed to the input of the regulators 2, from the output of which the reference to the current of the electric motors 7 and 8 is fed to the input of the current regulators 5. The current that occurs in the electric motors 7 and 8 creates a moment that causes the rotation to rise. winches that create effort in the cargo rope. In the STATE source and at the time of moving electric motors 7 and 8, the signal of sensors 10 to 11 is zero, cnrHaj-i on

output of comparator 5 is equal to logical zero, and the signal at the output of the block NOT 16 is equal to the logical one., which is fed to the input of the element And 17, the signal at the output of the comparators 13 h 14 is equal to the logical r g zero, which

,: call of the winch of the grab crane Dat-20 is fed to the inputs of the element I 1,: the current 9 switches are connected to the code, the controller is on the code of which the signal is equal to the log-; , sensors 5. Sensors 10 and 11 are speed zero, as this relay 9 actuators are connected to the inputs of regulators 2, the input unit 12 is better 25

laziness difference and the inputs of the comparators 13 and 14. Comparators -1 3--1 5 are made double. The output of block 2 through the comparator 15 and the block NOT 1 b is connected to the gate of the element And 17, the other input is connected to the output of the element And 18, and the switch is connected to the circuit T1: winding of the current alignment relay 19. The inputs of the element And 1S are connected to the moves of the comparators 13 and 14. Sensors 20 and 21 of the efforts in the cargo ropes of the winches are connected to the inputs of the synchronous current block 22 and the inputs of the forces 23 and 24 of the limitation 1 efforts ,, The outputs of the blocks 22-24 28 relays 19 and pins 29 and 30 of the probes ™ ka 1 are connected to the input of current regulators 5. Each block 23 and 24 includes the inputs of the first two of the 31-33s inputs of the first two of which are connected.

With force sensor 9 a VCDD; SEDIN 1-1Y with the input of the adder 33. Summa. Rows 31--33 are made on the basis of the operation of the amplifiers. Su No. 1 31 and 32 include S self dio; 1Y 34 and 35 in. The feedback circuit and diodes 36 and 37 in the center of their output.

The device works as follows c5 at a time.

Open grab in the initial position lies on the ground. Zadat-shk 1 is established from the position Za-: to close% after which the equilibrium from the position to the Rise. In this case, the contact 29 is closed, the contact 30 is open.

ATS in the initial position. As long as the signal from sensor 20 is less than the specified value, the signal at the output of unit 23 is zero, but as soon as the signal from sensor 20 becomes greater than the specified value, then the output of block 23 is a signal, liming, the current of the motor 7 appearing for JQ. The drive of the closing winch works without limitation of usg-gliy and vacuuming takes place, with the electric drive of the lifting winch, not gfep, gttstvu

.. em embedding grapple in the ground. With

 the grab is filled and even in the case of a hard grab, the tough pre 1.5.5 interfering with the complete loading of the grab begins by driving the grapple

/; j, 5 of the outgoing logo ,, and ,; at the same time, in the ropes of the lifting forehead bar: tskl1, slack and crust are formed. The boundary between block 23 allows it to be selected at a predetermined speed: Relay 19, its contacts 27 and 25, will disconnect block 23 to connect block 22 via pin 29 to the input of controller 2. Block 22., comparing the sigt -::: 1 to sensors 20 and 21 , syn-, to renizi: it drives electrical currents 7 and 8 at a given level and provides a noiffoeM grapple with a winch with reliable ei C closure. To open the grab, the dial is moved to the Open position, the npi-hcham pin 29 is opened, and the 30 pin is closed by connecting the block 24 through the pin 28 to the wall of the wall 4 Then the setpoint is moved to the Down or Up position of the open grapple and

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ATS in the initial position. As long as the signal from sensor 20 is less than the specified value, the signal at the output of block 23 is zero, but as soon as the signal from sensor 20 becomes greater than the specified value, then the output of block 23 is a signal that limits the motor to motor current 7. The drive of the closing winch works without limitation of usg-gliy and vacuuming takes place, with the electric drive of the lifting winch, not gfep, gttstvu

em embedding grapple into the ground. With

the grab is filled and even in the case of a hard grab, the tough pre 1.5.5 interfering with the complete loading of the grab begins by driving the grapple

of course, and at the same time, in the ropes of the lifting forehead bar: tskl1, slack and crust are formed. The boundary between block 23 allows it to be selected at a predetermined speed: Relay 19, its contacts 27 and 25, will disconnect block 23 to connect block 22 via pin 29 to the input of controller 2. Block 22., comparing the sigt -::: 1 to sensors 20 and 21 , syn-, to renizi: it drives electrical currents 7 and 8 at a given level and provides a noiffoeM grapple with a winch with reliable ei C closure. To open the grab, the dial is moved to the Open position, the npi-hcham pin 29 is opened, and the 30 pin is closed by connecting the block 24 through the pin 28 to the wall of the wall 4 Then the setpoint is moved to the Down or Up position of the open grapple and

similarly to the process of scooping, the forces of the closing winch are limited and its drive does not prevent the grapple from opening due to the weight of the soil and the greater speed of movement of the lifting winch ropes. To ensure normal operation, the voltage of the comparators should be at the lower limit of the speed control range of the electric motors 7 and 8. The bias voltage of the blocks 23 and 24 should ensure that the slack of the ropes at the nominal speed is selected, the force should not prevent the grapple from penetrating into the ground and keeps the motor is in a retarded state in the absence of slack in the cables. This force must not exceed a value of 0, 1 of the nominal force.

Claims (1)

1. A device for controlling the electric 25 is connected to the speed sensors, and The drives of the cargo winches of the grab crane, containing the operating mode setter, connected via serially connected speed and current controllers to the control inputs of the winches drives, speed sensors and current drives connected to the inputs of the speed controllers and current controllers, the current synchronization unit, respectively the course of which through the contacts of the current alignment relay is connected to the input of the current regulators, the extraction unit at the azpei, in the course of which is connected to the speed sensors, and the output through the comparator is connected to the winding power supply circuit; relay leveling currents, characterized in that, in order to improve the convenience in the co-operation ;, it is equipped with force sensors in 1-run winch ropes, connected to the inputs of the current synchronization unit, force-limiting units, inputs are bitter connection to the sensors, and the outputs through the relay contacts of the relay current are connected to the input of the current regulators, elements I, the inputs of the first of which are connected to the outputs of the second element AND and the comparator, and the output is included in the power supply circuit of the relay winding. Shani currents, and additional codes pa i and entrances the second element I. under item 1, about t of l and the fact that each effort includes at least three soums} two or three kz of which the force is sent to the transmitter, and with the inputs of the third