There is most common type of overhead crane, found in many factories. These cranes are electrically operated by a control pendant, radio/IR remote pendant, or from an operator cabin attached to the eot crane. In additionn, during the daily usage, there may be occur rust phenomenon. Nucleon crane's emgineer has talked about some method to remove the rust. However, do you the other ways?
1. sand blasting to remove the rust
Using high-pressure air to bring out a kind of descaling method that quartz sand radiates to the exterior of the component. Sources of quartz sand include river sand, sea sand and artificial sand. The cost of sand is low and the source is universal, but the environmental pollution is large; the derusting is entirely operated by manual operation, and the rust-removed components have a small surface roughness and do not easily reach the requirements of the friction coefficient. Sea sand should be removed before use.
2. pickling rust
Pickling and rust removal, also known as chemical rust removal, is based on the chemical reaction of acids and metal oxides in acid pickling baths to dissolve the metal oxides and remove rust and dirt from the steel surface. However, pickling cannot reach the surface roughness of shot blasting or shot peening. And in the pickling rust removal must be a lot of clean water and passivation solution; it formed a large number of wastewater, waste acid, acid mist to form environmental pollution. If the solution is improper, it will also form metal surface over-etching, forming pits. It is rarely taken.
3. manual and power derusting
The tool is simple and easy to construct. However, the labor intensity is high and the quality of rust removal is poor. The law will only take part if it is not available in other ways. For example, the trimming of individual components or the partial derusting of the installation site. It is rarely used to prepare tools: grinder, blade, wire brush, emery cloth and so on.
The steel used for processing will suffer from deformation and corrosion due to uneven cooling and compression after rolling and various influences during transport stacking. In order to ensure the number and quality of processing, the processing plant should correct, level out and clean rust the steel before it is numbered and apply anti-rust paint.
