SU1602848A2 - Apparatus for controlling winches of grab-bucket crane - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to lifting and transport equipment, namely to means for controlling the operation of the grapple winches. The purpose of the invention is to increase reliability. In the device, block 20 corrects the start of the lift, depending on the signals from the sensors 14 and 16 of the force in the ropes, respectively, of the closing and supporting winches, which are compared in the comparison block 15, commands the transition from scooping to lifting earlier or later than in the previous cycle. 1 il.

Description

FIELD OF THE INVENTION The invention relates to lifting and transport equipment, namely to means for controlling the operation of the grapple winches.

The purpose of the invention is to increase reliability.

The drawing shows the functional diagram of the device.

The device for controlling the grapple crane winches contains sensors 1 and 2 of rope lengths supporting and closing winches 3 and 4, respectively, blocks 5 and 6 of determining the direction of rope movement, the outputs of which are connected to blocks 7 and 8 of the signal sign evaluation, the outputs of which are connected to the inputs of block 9 determining the difference in the length of the ropes, the outputs of which through the decoders 10 and 11 are connected to the inputs of the blocks 12 and 13, respectively, of forming the commands for opening and closing the grab, respectively, and the output of the sensors is connected to the input of the block 13 ika 14 force in the closing winch rope, comparison unit 15, to one input of which is connected the sensor 16 efforts in the supporting winch rope, and to another - the said output of sensor 14, and output of the crane operating mode 17 connected to the input of block 13 with the input element 18 AND-NOT. The device also contains a delay element 19 connected by the input to the output of depot 11, and the output to the input of the lifting time correction unit 20, the output of which is connected to the lifting command forming unit 21, with blocks 12, 13 and 21 connected to unit 22 winch control.

The device works as follows.

After issuing the command, scooping up with the help of the setting device 17, the signal goes to block 13 and block 21. These blocks connect the closing winch through the block 22 in the direction of choosing a rope with full moment and full speed, and supporting winch for lifting with a small moment that does not interfere the grapple goes deeper into the material and at the same time sufficient to select the slack of the rope (supporting winch).

Unit 9 processes the signals from the sensors 1 and 2 of the length of the ropes and the signal at its output corresponds to the difference in the lengths of the ropes of the winches. After the grapple jaws converge, decoder 11

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issues a signal at which unit 13 stops the closing operation and starts the lifting operation of the grapple using cords and the delay element 19 starts counting the time delay. After a time delay (2.5-3 s), sufficient to terminate the transient process in the engines, and the achievement of the steady-state speed, the delay element 19 gives a signal to allow correction of the beginning of the transition from scooping to lifting for the next cycle. Correction is as follows. The sensors 16 and 14, respectively, the efforts in the cables, generate signals proportional to the forces in the respective cables to the inputs of the comparison unit 15, which, at its output, produces signals "+," -, "equal to, depending on the compared values.

If the force in the closing winch rope is greater than that in the support winch rope, then the signal "+" is generated and on this signal the block 20 gives a command to blocks 21 and 13 to go from scooping to lifting earlier than in the previous cycle.

If the effort in the rope of the closing winch is less than that in the supporting rope, then the signal is generated - and in the next cycle the transition from scooping

to rise occurs later than the previous one.

If the forces in the ropes are equal, then block 20 retains the setpoint of the previous cycle.

Claims (1)

5 Formula of Invention A device for controlling the winches of a grab crane according to ed. St. No. 1278292, characterized in that, in order to increase reliability, it is equipped with a lift command generation unit, lifting time and comparison start correction blocks, a delay element and a force sensor in the support winch cable, the output of which is connected to one of the block inputs 5 comparison, to the other input of which the output of the force sensor in the closing winch cable is connected, and the output is connected to one of the inputs of the lifting start correction unit, the other input of which is connected through the delay element to the output of the supporting and closing cable length difference unit winches, and the output is connected to another input of the raising command forming unit and to the fourth input of the forging unit of the command for closing the grapple, the fifth input of which and the third input of the raising command forming unit By connecting to said output setpoint crane operation mode.