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The existence of the installation error of the planetary gear would lead to the uneven load problem of the planetary gear train, which would affect the transmission performance and life of the reducer. Previous studies have not clearly defined the impact of installation errors on the system's load sharing performance at different angles, and there have been few studies on the impact of multiple planetary gear pairs on system load sharing (under different installation errors and input powers). Therefore, the influence of installation errors of planetary gear systems on the system's load sharing performance in practical applications was studied. Firstly, taking the heavy-duty four-planetary gear train as the research object, the comprehensive error expression of the radial and tangential installation errors of the planetary gear was established. Then, the influence of different installation error angles and values for the single planetary gear on the load sharing system was analyzed based on the transmission model of the gear train. Finally, the influence of multi-planetary gear on the load sharing system under different working conditions and error configurations was analyzed based on the single planetary gear. The results show that the tangential installation error of the planetary gear has the greatest influence on the load sharing of the system, and the radial installation error has the least influence on the load sharing of the system. When the installation error of the single planetary gear is 60 μm and the installation error angle θ is close from the radial direction to the tangential direction, the load sharing coefficient of the planetary system is increased by 9. 6% . The greater the absolute value of the error, the greater the load sharing coefficient. When the installation error of the single planetary gear is from - 30 μm to - 60 μm, the load sharing coefficient of the system is increased by 4. 6% . The influence of tangential installation error of multi-planetary gear on system load sharing can be measured by effective error. In the load range of the gear, with the increase of the input power, the influence of the installation error on the load sharing of the system will be decreased gradually. [ABSTRACT FROM AUTHOR]

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The apparatus for the commingled drainage of multiple layers superposed coalbed methane(CBM) system has been developed specifically for the special CBM reservoir-forming characteristics of the “multiple layers superposed CBM system”. The following results were obtained:(1) Conventional commingled drainage test was carried out with four layers superposed coal seams and the reservoir pressures were 1.0 MPa, 1.4 MPa, 1.8 MPa and 2.2 MPa respectively. During the process of drainage, gas in high reservoir pressure coal seam flowed into the coal seams with low reservoir pressure, which suppressed the output of low reservoir pressure coal seam and was harmful to commingled drainage；(2) Progressive drainage test was carried out by optimizing gas production time in different coal seams and gas inversion between different coal seams was avoided effectively. The recovery ratio of lowest reservoir pressure coal seam and superposed coal seams were increased by 6.5% and 1.3%, respectively；(3) Progressive drainage can reduce the gas production contribution rate of high reservoir pressure coal seams and increase the gas production contribution rate of low reservoir pressure coal seams, which make gas production distribution more reasonable；(4) Superposed difference coefficient showed rising firstly and then decreasing, which indicated that the difference between conventional commingled drainage and progressive drainage was changing dynamically during drainage. It reached the maximum in the mid-term of drainage and decreased slightly in the late stage of drainage. [ABSTRACT FROM AUTHOR]