Mineral sizer crusher is mainly used for crushing bituminous coal, anthracite or shale for coarse and medium crushing. The particle size of the broken products is usually not less than 20mm. In coal preparation plant, toothed roll crusher is mainly used in the crushing of large raw coal, also useful in the crushing of medium coal. The main technical indicators of mineral sizer crusher are granularity of feed, granularity of discharge, crushing amount, over-crushing rate, etc. The ratio of granularity of feed and granularity of discharge is the crushing ratio. These technical indicators are determined by the form of the tooth roll. Domestic research on double-toothed roller classification crushing technology began in the middle and late 1980s. After years of efforts, the independent design and development ability of the product has made great progress. The medium and small machines with processing capacity < 300t/h can basically meet the requirements of users, but there is still a certain gap compared with the design level of similar products abroad.
1. Development and application status of mineral sizer crusher
In recent years, with the construction of large-scale coal preparation plant, the demand for mineral sizer crusher with processing capacity of more than 500t/h has been growing year by year. The crusher requiring large crushing ratio, high degree of automation, stable discharge particle size, low noise, safe and reliable, and easy to maintain will have a great market demand. At present, the domestic crusher manufacturers, each engaged in research and development of technical personnel is often not more than a few people, technical research and development means are often based on the original experience qualitative, few rigorous scientific demonstration, lack of rigorous scientific, equipment improvement is small, slow technological progress, old models, the author believes that there are mainly in the research and development of two prominent problems: One is the lack of theoretical summary and research. In view of the increasing popularity of the use of double-tooth roller crushing equipment with large processing capacity, the use effect has been widely affirmed and it is very successful from the perspective of practice, but it is an important sign of the maturity of a new technology, and also a sign that this kind of equipment can break through its own technology to make substantial leap forward, which is the final formation of a
Good theoretical system, and the domestic work in this area is still a huge gap; Second, the indicators need to be refined. In addition to the lack of theoretical research, another more practical problem is the refinement of parameters. In particular, although graded crushing technology is derived from crushing technology, it is not only simple crushing, and has a very close relationship with coal preparation technology. Because of the diversity of coal preparation technology and its own characteristics of the process have special requirements for particle size, over grinding. In order to cooperate with it well and give full play to the performance of all kinds of equipment, so that the technical parameters can reach the best, we must refine and standardize the technical indicators such as the upper limit rate, over crushing rate, crushing ratio, processing capacity and so on.
2. The crushing principle of mineral sizer crusher
Mineral sizer crusher The Mineral Sizer Crusher utilizes two tooth rollers rotating in opposite or opposite directions to extrude and crush ore by grinding shear and discharge ore between the two rollers when the ore has reached the required size. The relative rotation of the two teeth roller is like a rotating screen. The material that meets the grain size requirements is initially screened by the tooth roller or the gap between the tooth roller and the lining plate, so as to avoid the re-crushing of that part of the material through the roll teeth, which not only reduces the crushing rate and energy consumption of the material, but also reduces the crushing time of the roll teeth and prolongs the service life. At the same time make the tooth roll opposite or opposite operation, with better shear and tensile crushing effect. The movement of roller teeth also makes the material broken after forced discharge, not easy to produce congestion. The roller tooth is a key component, its structure shape is reasonable or not, not only directly affects the service life of the whole equipment, but also closely related to the crushing power consumption, production capacity and the quality of the discharge particle size. Therefore, in the design process of mineral sizer crusher, the tooth shape selection and design method is a key technology, but also an urgent theoretical problem to be discussed. In a word, the main crushing effect of mineral sizer crusher is fragmentation, which is generally used for crushing bituminous coal, anthracite or shale for coarse and medium crushing. The particle size of the crushed products is usually not less than 20mm. In coal preparation plant, toothed roll crusher is mainly used in the crushing of large raw coal, also useful in the crushing of medium coal. The main technical indicators of mineral sizer crusher are granularity of feed, granularity of discharge, crushing amount, over crushing rate, etc. The ratio of granularity of feed and granularity of discharge is the crushing ratio. These technical indicators are determined by the form of tooth roller.
