How to Prevent Rainy Season for Large Cranes?

A crane is a type of machine, generally equipped with a hoist rope, wire ropes or chains, and sheaves, that can be used both to lift and lower materials and to move them horizontally. It is mainly used for lifting heavy things and transporting them to other places. The device uses one or more simple machines to create mechanical advantage and thus move loads beyond the normal capability of a human. Cranes are commonly employed in the transport industry for the loading and unloading of freight, in the construction industry for the movement of materials, and in the manufacturing industry for the assembling of Heavy Equipment.

Large cranes for open-pit operations, such as quayside container cranes, loading and unloading bridges, portal cranes, mobile tower cranes, bridge erectors and large crawler cranes, have different mechanisms, but they all have the same characteristics: high equipment, large size and large windward area. Therefore, it is extremely vulnerable to lightning strikes, typhoons and gusts. At the same time, the activities of sunshine and rainstorm are frequent, and the rainwater becomes more acidic with the harsh environment, which corrodes the large lifting machinery alternately. The crane is easy to corrode, making the mechanical work of open-pit operation more difficult. At this time, we need to do a good job of rust prevention in time.

So how do we maintain and prevent rust? What should we pay attention to?

(1) For the damaged part of the paint film on the metal structure, the surface of the component should be cleaned up and coated with anti-rust paint and decorative paint film to protect the metal surface from rust after rain and snow.

(2) In the movable parts of the lifting machinery, such as the connecting pin of the sling and the crane, the guide wheels, the trolley wheels and so on, we should conscientiously do a good job of rust prevention. After shutdown, brush these parts clean first, remove the impurities, moisture, rust spots that can lead to rust, and then use - 10 or - 20 diesel oil for these parts, because - 10 or - 20 diesel oil has stronger permeability than engine oil, loaded twisted parts can penetrate into the metal surface, resulting in oil film, and because of its low freezing point, it can resist low temperature.

(3) After cleaning and lubricating with diesel oil, a layer of grease is applied. Calcium or lithium grease is a good choice, because these two greases have good mechanical stability, adhesion and water resistance, and the solidification point can reach - 20 degrees. When applying grease, the coating should not be too thick.

(4) In the process of design and manufacture of lifting machinery, and in the selection and use of cranes, the design and manufacture units of lifting machinery should fully consider the influence of environmental and climatic factors on the cranes, adapt to environmental design, reasonably select materials in the manufacturing process, and take effective preventive measures in the use process,in order to ensure the safety of lifting machinery.

Daily maintenance and rust prevention work is the key to improve the service life and working ability of Open-pit Machinery.