When do roll crushers need to change roll skins? Roller skin, as the main accessory of roller crusher, the time of replacing the roller skin, according to the degree of wear and tear, equipment operating status and production effect of comprehensive judgement, the following are the main judgement criteria and influencing factors:
Roll Crusher Roll Skin
Wear depth of roll skin
When the wear depth of roll skin surface exceeds 3-5mm or serious cracks or damages occur, it should be replaced immediately. Thickness ratio
Wear amount reaches 20%-30% of the original thickness should be replaced, and the remaining thickness of the roll skin should be scrapped when it is less than 30mm.
Deterioration of material quality of Roll Crusher
Uneven granularity of finished products, fineness percentage is lower than 70% (normal is more than 92%). The appearance of a large number of dust or super-grain phenomenon, indicating that the roller skin has been unable to effectively crush the material.
Reduced production capacity
The crushing efficiency of the equipment decreases significantly, and the output per unit time is reduced.
Abnormal operation
Uneven wear of roller skins will lead to increased vibration of the equipment, accompanied by abnormal noise. The friction resistance of the crushing process increases, and the energy consumption of the equipment rises significantly.
Material characteristics
When dealing with high hardness (such as ore) or corrosive materials, the life of the roller skin may be shortened to 3-6 months (6-12 months for ordinary materials). Roller Skin Material
The life of roller skins made of wear-resistant materials such as high chromium alloy and high manganese steel can be more than 1 year, while ordinary materials may need to be replaced in half a year.
Maintenance Suggestion
Measure the thickness of the roller skin every 1-2 months, and observe whether there are wedge-shaped lines or grooves on the surface. Even feeding: avoid uneven distribution of materials leading to rapid localised wear. Timely adjustment: When slight wear is found, the roller can be moved axially (the moving distance is about 1/3 of the feeding granularity) to prolong the service life.
If any of the above situations occurs, it is recommended to stop the machine to replace the roller skins and follow the standard operating procedures (e.g., power off, unloading pressure, preheating the liner, etc.) to ensure safety.
