Operation Instruction of Double Girder Overhead Crane

Before work

1.Check the brake, hook, wire rope, safety device and other parts according to the requirements of the spot check card. If any abnormal phenomenon is found, it shall be eliminated first.

2.The operator must confirm that no one is on the walking platform or track before closing the main power supply. When the power circuit breaker is locked or has a notice board, the main power supply can be closed only after the original relevant person removes it.

At work

1.When lifting heavy objects for the first time in each shift (or when the load reaches the maximum weight), the heavy objects shall be put down again after lifting 0.5m from the ground, the brake performance shall be checked, and normal operation shall be carried out after confirming the reliability.

2.The operation shall be carried out according to the command signal specified uniformly.

3.In case of sudden power failure during operation, all controller handles shall be placed at “zero” position, and crane action shall be checked before re-operation.

4.During the normal operation of the crane and trolley, it is strictly forbidden to start the reverse brake to stop; when changing the movement direction of the crane and trolley, the handle must be placed at the “zero” position, so that the mechanism can be started in reverse only after it stops completely.

5.For a crane with two hooks, when the main hook and auxiliary hook are replaced and the height of the two hooks is similar, the main hook and auxiliary hook must be operated separately to avoid collision.

6.The crane with two hooks is not allowed to hoist two objects at the same time; adjust the brake of lifting mechanism when it is not working.

7.It is not allowed to use limit position limiter to stop and adjust the brake of hoisting mechanism under load.

8.In case of any abnormality, stop the machine immediately, check the cause and eliminate it in time.

Strictly implement the system of “no-hoisting”

Do not hoist if command signal is unclear or disorderly;

Do not lift when the rated lifting capacity is exceed;

Do not hoist when improper use of spreader or loose binding of objects exist;

Do not lift if there are people or other floating objects on the lifting objects;

Do not lift if holding brake or other brake safety device fails;

Do not lift when the crane suspends heavy objects for direct processing;

Do not lift explosive objects;

Do not lift buried objects;

Do not lift the objects with edges and corners without pad.

After work

1.Raise the hook to a certain height, stop the crane and trolley at the designated position, and place the controller handle at the “zero” position; pull down the switch handle of the protection box and cut off the power supply;

2.Carry out daily maintenance;

3.Do good job shift handover.
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