Safe Control and Protection of Overhead Crane

1. The heavy objects shall be able to move along the up, down, left, right, front and back directions, and can move simultaneously in the three-dimensional direction. Except for downward movement, the terminals in the other five directions shall be provided with terminal protection;

2.There should be reliable braking device, even in the case of power failure, the weight will not fall due to dead weight;

3.There should be a large speed regulation range. When moving from static state, it should accelerate gradually from the lowest speed, and the acceleration should not be too large;

4.In order to prevent the possible danger of overload or overspeed, there should be short-time overload protection measures. Generally, over-current relay is used as overload protection of circuit;

5.There should be no-voltage protection;

6.There should be safety protection measures.

Notes and Attentions While Operating Crane

1.Each crane must be labeled with the rated lifting capacity at an obvious place;

2.During work, no one is allowed to transport people on the crane or with the hook;

3.Do not drive the crane without operating license or after drinking;

4.During operation, it is necessary to concentrate, not talk, smoke or do irrelevant things;

5.The crane shall be clean; equipment, tools, in-flammables, explosives and dangerous goods shall not be placed around;

6.Crane is not allowed to be used under overload;

7.When the crane is running on the line without obstacles, the hook or sling and the bottom surface of the crane must be more than 2m from the ground;

8.If the obstacle is crossed, it must be 0.5m higher than the obstacle;

9.For bridge crane with main and auxiliary hooks, do not raise or lower the main and auxiliary hooks at the same time (special exception);

10.Inspection or maintenance can only be carried out after power failure and when the sign of power failure operation is hung on the switch. If live working is necessary, safety measures shall be taken for protection and special personnel shall be assigned to take care of it;

11.Limit switch and interlock protection device shall be checked frequently;

12.When there is a problem with the lifting brake, it is not allowed to lift heavy objects;

13.The hoisted objects are not allowed to run over people or equipment;

14.When welding a part of the crane, the ground wire shall be specially set, and the machine body is not allowed to be used as the ground wire;

15.When the hook is at the lower limit position, there must be more than two circles of safety rope on the drum;

16.Cranes are not allowed to collide with each other, and it is not allowed to use one crane to push another crane to work;

17.When lifting heavy objects, liquid metals, explosives and dangerous goods, it is necessary to slowly lift them 100-200mm from the ground to test the reliability of the brake;

18.All electrical equipment casings of bridge crane shall be grounded;

19.Safety technical inspection shall be carried out regularly, and pre inspection and pre repair work shall be done well.
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