Electric hoist maintenance methods

 

Various Types Electric Hoist Maintenance Methods

• Newly installed or removed after the installation of electric hoist, first of all should be empty trial operation several times. But before crane company installation, no test should be done.
• Test should be carried out at 125% of rated load, lifting above the ground about 100 mm, 10 minutes of static load test to check whether it is qualified.
• Dynamic load test is based on the rated load weight, for repeated movements and left and right movement test, test the mechanical transmission parts, electrical parts and connections are normal and reliable.
• In usage, it is absolutely forbidden to use it in an un-allowed environment, exceeding the rated load and the rated closing times per hour (120 times).
• During installation and maintenance, you must strictly check whether the limit device is flexible and reliable. When the hook is raised to the upper limit position, the distance between the hook shell and the drum shell must be more than 50mm (10t, 16t, 20t must be greater than 120mm). When the hook down to the lower limit position, should ensure that the rope safety rope reel, effective safety circle must be more than 2 laps.
• It is not permissible to press both flashlight buttons that move the electric hoist in the opposite direction at the same time.
• The work must be completed after the power of the total brake opened, cut off the power.
• Electric hoist should be manned by hand, the operator should fully grasp the safety rules, is not allowed to tilt the crane.
• During usage, electric hoist must be regularly checked by specialized personnel to find out the fault promptly take measures and carefully recorded.
• Adjusting the electric hoist braking slip, should ensure that the rated load, the brake slip S ≤ V / 100 (V is the load within one minute of steady lifting distance).
• Wire rope scrap standards: Wire rope inspection and scrap standards according to CB / T5972-1986 "Hoisting machinery wire rope inspection and scrap practical norms" implementation.
• Electric hoist must be used in the maintenance of adequate oil, and keep the oil clean, should not contain impurities and dirt.
• Steel wire rope should be used when the hard brush or small pieces of wood, is strictly prohibited to work directly to the wire rope.
• Electric hoist does not work, it is not allowed to hang heavy objects in the air, to prevent permanent deformation of the parts.
• During usage, if a fault is found, the main power should be cut off immediately.
• Operator should pay special attention to wearing parts.
• 10 ~ 20 tons of hoist continuous operation for a long time, it may be automatic power-off phenomenon, which belongs to the motor overheating protection, this time can be reduced, after a period of time, until the motor cooled down to continue working.