Determination of Linear Velocity and Material of Outer Spherical Surface Bearing with Seat

Determination of linear speed of outer spherical surface bearing with seat

On two CXP900 with different speeds × Install bearings of the same style and material on the 600 paper shredder, and compare the relationship between the linear speed of the experimental bearings and the service life of the bearings. When the rotational speed is 960r/min, the linear speed of the bearing is 45m/s, the service life of the first pair of bearings for crushing shaft kiln clinker is 3500t~4000t, the discharge particle size is 5mm, and the pure wear of the bearing is about 8g/t. When the rotational speed is 610r/min, the linear speed of the bearing is 28.8m/s, the service life of the first pair of bearings for crushing shaft kiln clinker is 6500t~7500t, the discharge particle size is 8mm, and the pure wear of the bearing is about 4g/t. The higher the linear speed of the bearing, the greater the wear. According to this rule, we plan to have a working linear speed of 0.45m/s and a rotational speed of 2.7~8.7r/min, which is 1/120~1/100 of the working linear speed of other domestic fragmentary machines. Ultra slow linear speed creates beneficial prerequisites for the durability, vibration, power consumption, and environmental protection of the machine, especially the selection of wear-resistant materials.

2. Determination of wear-resistant material

According to the wear mechanism of wear-resistant materials, when the hardness of wear-resistant parts is lower than the hardness of clinker, the wear speed is very fast, otherwise the wear resistance is greater. If the material toughness of the bearing is lower than that of the clinker, gouging, peeling, or fatigue may occur under the high-speed impact of the clinker.

As labor peels off, the rate of wear increases. What is more important is that it is not flexible enough and easy to fracture. Due to the higher hardness, the lower the toughness ratio, it is very difficult for high hardness wear-resistant parts to be used in high linear speed and large impact force crushers. The hardness of shaft kiln clinker is generally HRC50~52, and that of reverse kiln clinker is HRC52~54. Therefore, the hardness of wear-resistant parts for crushing clinker must reach HRC58 or above to achieve good wear resistance. Using the principle of ultra-slow shear fragmentation, the fragmentation machine has much less impact during operation and much less heat of conflict during operation. High hardness wear-resistant materials can be selected.