The impact crusher is a kind of crusher used to crush super-hard materials, in order to replace imported vulnerable parts.After long-term and unremitting research and on-site production assessment, our company found that CYK type high chromium alloy cast iron can completely replace imported parts and achieved significant economic benefits.
Working conditions and material selection of vulnerable parts of impact crusher
1. Working conditions
Quartzite and quartz sandstone are used to make sandstone materials, and then the concrete is prepared. The content of SIO in these two sand and gravel materials is 75% to 90%, the Mohs hardness is above 7, and the compressive strength is 200-300MPa.The technical parameters of the introduced crusher are: rotor diameter 1000×width 1000mm, speed 740r/min, power 160kw,maximum feed size 150mm, crushing capacity 120t/h.The vulnerable parts brought randomly in the equipment have been assessed on site and have a service life of 110-125h.Another working condition characteristic of vulnerable parts in operation is: the high-speed running impact hammer repeatedly collides with high-hardness quartzite, and the working surface temperature of the impact hammer is as high as 500-600℃.Therefore, anti-wear materials must have sufficient toughness and hardness at higher temperatures.
2. Wear mechanism
The wear of the vulnerable parts such as the impact hammer and the impact plate in the impact crusher is chisel abrasive wear. This kind of wear is groove wear with strong surface strain and mechanical strain. The groove is formed because the abrasive cuts into the metal substrate at a certain speed under the action of external force, and after a period of slippage, it separates from the metal substrate, and then on the substrate There are grooves left.The formation of the groove depends on the magnitude of the local stress and the relative value of the hardness of the metal surface and the abrasive.Under the same stress, the greater the abrasive hardness, the easier it is to produce grooves. Due to the high hardness of sandstone,the grooves produced on the metal matrix tend to occupy a major position in the wear.
3. Material selection
We analyzed and tested the metallographic structure, mechanical properties and chemical composition of the remains of imported voestalpine products.The results show that the material used in the imported parts is a high-alloy anti-wear material, and its metallographic structure is martensite plus bar-shaped primary carbide plus secondary carbide, and the hardness is HRC62-64.We have conducted extensive investigations and physical analysis on the use of commonly used anti-wear materials at home and abroad. On this basis, we have conducted a large number of material tests according to the working principle of the impact crusher and domestic resources, and selected CYK high chromium alloy cast iron come for trial production.
The damage of the vulnerable parts of the impact crusher will seriously affect the effect of the beneficiation operation, and the wear of the vulnerable parts of the impact crusher and the selection of materials are very related.So you must be careful when choosing the material, try to avoid the wear and tear of some parts of the impact crusher, which will bring trouble to your production.
As a supplier with nearly 30 years' manufacturing, Shuguang Heavy Machinery also produces and sells hammer crushers, impact crushers, vertical shaft crushers, cone crushers, compound crushers, Raymond mills, high pressure mills. Powder machine, vertical mill, ultra-fine grinding machine, ball mill, double-shaft shredder and other heavy equipment crusher. Feel free to contact us for more details.
Factory Address: Longjiang West Road, Shangjie District, Zhengzhou City
Contact number: +86-371-67666660 676667
Mobile phone: 0086 13523465141
After-sales Service Department: 0371-67666667
