Single girder gantry crane electric automatic correction method

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Large span single girder gantry single girder gantry crane to be automatic correction, the first to analyze the reasons for the deviation and phenomena produced, and then take the corresponding corrective measures. Usually have the following types of electrical automatic correction methods:
1, by comparing the crane just the leg side carts go round and soft leg-side carts go round the actual operation of the line speed, which can be driven with a rubber friction wheel rotary encoder for closed-loop control method for correction;

  2, when the legs just legs and soft sides of the motor speed is not the same, such as the average speed of the motor than just the leg side leg side motor soft fast 1/1000, which can be calculated gantry Semi-gantry crane  pulse encoder input pulse number of methods to carry out corrective PLC;
  3, the angle between the single-girder crane girder with flexible legs more or less than 90 degrees, this method can be installed on top of the soft legs in angular displacement sensor to correct;
  4, directly next to the rail mounted parallel to the leg side and just soft leg-side carts run some sensing point, measured using a proximity switch proximity switch action just the leg side and soft side of the leg and has an input method for PLC input correction .