Gantry crane electric automatic correction method used

Span  gantry crane  doors confidential automatic correction, we must first analyze the causes of deviations and phenomena, and then take the corresponding corrective measures. Usually have the following types of electrical automatic correction method:

1, when the flexible legs and the leg just the motor speed is not the same on both sides, if just the average speed of the motor the leg side leg side of the motor, the softer fast 1/1000, which can be calculated by the PLC encoder pulses input method for correction;

2,  bridge gantry crane  girder and soft leg angle is greater than or less than 90 degrees, which can be installed on top of the flexible leg angular displacement sensor approach to correction;

3, hoist gantry crane  just by comparing the leg side carts go round and soft leg-side carts go round the actual operation of the line speed, which can be rotated with a rubber friction wheel encoder for closed-loop control method correction;

4, directly on the leg side and just soft leg side carts running parallel to the rail next to install some sense points, using proximity switches measure just the leg side and a soft leg side proximity switch operation successively and enter the PLC input approach to correcting .