three phase electric hoist maintenance

1 after a new installation or dismantling installed three phase electric hoist, should first be empty commissioning several times. Former but not installed, avoid power test switch.
Should be carried out prior to normal use of the rated load of 2 to 125%, up from approximately 100 mm above the ground,portable electric hoist the static load test of 10 minutes, check whether it is normal.
3 Dynamic load test based on the weight of the rated load, as repeatedly lift and move around the test, checking the mechanical transmission parts After the test, the electrical part and the connecting portion is normal and reliable.
4 using three phase electric hoist, the absolute prohibition under circumstances not permitted, and exceed the rated load and nominal closing per hour (120 times) the case.
5. installation and maintenance, must strictly limit device is flexible and reliable inspection, when the limit was raised to the position of the hook, hook it to the shell casing from the rolls must be greater than 50mm (10t, 16t, 20t must be greater than 120mm). When the hook dropped lower limit position, should ensure the safety rope on the drum circle, circle must be safe and effective in more than two laps.
6. allowed to press the two make three phase electric hoist in the opposite direction of movement of the flashlight door button.
7 After the completion of the work must always pull the brake power, cut off the power.

three phase electric hoist pulley scrapped

Electric hoist crane pulley, metal casting, appear temporarily the following situation, should be scrapped:
three phase electric hoist  pulley
1) crack.
2) the wheel groove uneven wear loss reached 3mm.
3) wheel groove wall thickness wear up to 20% of the original wall thickness at.
4) because of wear of the wheel groove bottom diameter reduction of wire rope diameter 50%.
5) other damage of steel wire rope defect related issues.
Two, the ratio of electric hoist crane pulley diameter and the wire rope diameter shall be not less than the specified value.
Three, electric hoist crane pulley groove should be smooth, manual lever hoist no damage of steel wire rope defect driving.
Four, electric hoist wire rope pulley should prevent the device from the wheel slot.

hoist equipment mast distortion correction method can be eliminated

Electric forklift mast distortion correction method can be eliminated. When bending and twisting deformation is small, allowing the cold calibration correction method applied motorized chain hoist static load . When bending , distortion is too large, correction is difficult to use cold , heated correction should be heated to minimize the heating zone , the heating temperature is generally not more than 700 ℃, and slowly cooled so as to increase brittleness.three phase electric hoist mast crack repair : If the inspection found cracks should be repaired .repairs should be carried out before the forklift mast correction , maintaining the inherent straightness mast .grinding cracks to expose the metallic luster , and then carefully examined to determine the boundaries of the crack extends 10mm at the boundaries of the drill ¢ 5 - ¢ 8mm of limiting, holes.