When the metallurgical crane is working, the highest temperature of the molten iron can be more than 1000℃. The iron juice in the molten state is very fluid. If the molten iron is not handled properly during the lifting or pouring process, the molten iron liquid will overflow or falling. It may cause life safety accidents, and falling on the equipment will also have a great impact on the service life of the equipment. Therefore, the operation must be very careful when the metallurgical crane is working.
The structure of the metallurgical crane is basically the same as that of the general-purpose bridge crane. It has two sets of main and auxiliary lifting mechanisms. The main and auxiliary trolleys travel on the main and auxiliary beams respectively. In the operations of transporting molten steel and pouring steel ingots, the main hook is used to lift the ladle, and the auxiliary hook is used to dump the ladle. In addition to observing the general operating rules and related systems of general overhead cranes, crane workers must also master the following rules and operating essentials:
1) You should be familiar with the whole process of the lifting process, understand the action requirements of each link and the relationship between each other. To ensure the smooth progress of molten steel lifting and pouring.
2) Before lifting the ladle, it is necessary to prove that the hook is hooked on the neck of the lifting ear correctly and reliably, and then lift the ladle according to the command of the full-time personnel.
3) In order to prevent the hot molten steel from directly baking the hook group, the hook for lifting the ladle should be equipped with heat insulation device, such as a partition or a long neck hook.
4) The molten steel must not be filled too much to prevent the large and small cars from starting or braking too fast and causing the pendulum, causing the molten steel to spill and injure people.
5) Before lifting molten steel each time, you should first try lifting it. Slowly raise the ladle containing molten steel to a height of 200mm from the ground, and then lower the brake to test the reliability of the lifting brake. If it does not exceed the allowable sliding distance (generally not more than 100mm), the lifting operation of molten steel can be formally carried out.
6) When lifting molten steel, it is strictly forbidden to pass directly above the head.
7) When lifting molten steel, the speed should not be too fast, and the controller handle should be placed in the second gear.
8) When starting the lifting mechanism to raise or lower the ladle, it is strictly forbidden to start other mechanisms such as large carts or small trolley, so that the crane workers can concentrate and avoid accidents caused by misoperation.
9) Before turning the ladle, use the hook of the auxiliary trolley to hook the turning ring on the ladle reliably. Only follow the instructions of full-time personnel at work.
10) Do not directly contact the steel wire rope of the auxiliary lifting mechanism with the ladle or the balance frame.
11) When the molten steel is poured into the furnace from the casting trough, only the ladle is allowed to be transported on the edge of the trough and maintain a proper height.
12) When opening the "nozzle brick" of the ladle, no one is allowed to stand under the ladle to operate the pressing rod.
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