Planetary gear transmission has the advantages of compact structure, small size, light weight, large transmission ratio range, high efficiency, stable operation and low noise. The volume is optimized to minimize the quality and can not bring obvious economic benefits. After the mining car has been used for a period of time, some wheel reducers begin to have failure problems. It is necessary to optimize the design of the planetary gears with the maximum safety factor within the existing installation size range to improve the service life.
Compared with the quality of mining vehicles, the quality of the planetary gear reducer of the Roots water ring vacuum unit is negligible. Therefore, an optimization calculation model with the highest safety factor is established, and the highest safety factor is achieved by optimizing the number of gear teeth and the displacement coefficient under the installation conditions. The discrete variables and continuous variables are processed separately, and the complex method is used to calculate with MatLab programming. Through optimization calculations, the contact stress safety factors of the sun gear and the planetary gear are respectively increased by the Sichuan vacuum pumps 9 and 10, which significantly improves the service life.
Dynamic analysis of electro-hydraulic main control valve for general hydraulic support, Lian Zisheng Taigong University of Mechanical Engineering College, Taiyuan, Shanxi 030024, China Abstract: According to the force analysis of electro-hydraulic main control valve, the mathematical model of the main control valve is established [1], and A complete electro-hydraulic control system was built under the AMESim environment. By analyzing the dynamic characteristics of the main control valve and the opening sequence of the two spools, the displacement, flow and pressure response curves of the main control valve were obtained. The results show that steady-state hydraulic power is a key factor affecting the dynamic performance of the spool.
Carbon Black Masterbatch,Liquid Masterbatch,Pvc Masterbatch,Deep Masterbatch
Well and Fast (SZ) Plastic Development Co.,Ltd , https://www.well-fast.com