Dynamic Analysis Of Thin Seam Shearer Cutting Gear Based On ADAMS

Gear transmission is a vital component in power transmission of shear cutting department, which decides working efficiency and life of the complete machine on its performance. It is also greatly suffered from impulse load in the working procedure of thin seam shearer reason for the features of thin seam shearer, such as the compact structure, narrow coal mining space, bad working condition, suffering different impulse load, the change of meshing stiffness for the single and double teeth alternate meshing and the influence of torque axis and motor performance, which has great impact to the performance of gear transmission. For reflecting the dynamic performance in transmission wholly, in constant torque, dynamic analysis of gear transmission is necessary. To some type of thin seam shearer with dual motor drive, establishing the model and applying a constant torque conditions dynamic simulation analysis of the cutting department in gear transmission, of which the main studies as follows:First of all, in the help of UG, the three dimension model of cutting department on gear transmission and torque axis are established, after which taking the virtual assembly and interfere check.Secondly, for the reason of the errors in manufacturing and assembly, leading to the deviation of center distance between every gear, which have a certain affection of load fluctuation to transmission gear. To the study of the 3-axis and 4-axis which are bore maximum loads in theory of dual motor drive, through the dynamic simulation analysis of different central distance deviation to gears in 3-axis and 4-axis, load fluctuation of each gear is increasing with the adding central distance deviation. While the center distance installation error ranges from 174.979 mm to 175.041 mm, the fluctuations are very small which is match to the practice, but if the deviation over it, the fluctuations will be relevantly increasing.Once again, analysis the problem that the output characteristics of the two motors is not exactly the same due to the manufacturing error and other reasons. Report shows that transmission will produce beat phenomenow when the speed difference exists in motor, and thus increase the meshing impact. With the help of dynamic analysis of gear transmission in speed difference motor by ADAMS, finding that the load fluctuation in 1 and 2 axis gears is very high, and increasing with the speed difference increasing, but the value of speed difference should not over 5 r/min. When the speed difference exists in motor, the low speed motor should be installed in 1 axis, and the high speed motor is better installed in 3 axis, which will reduce the load and vibration in each gear.Lastly, According to the torque of the motor shaft and intermediate shaft torque stiffness affects the gear load fluctuation problem. Through the way of taking each stiffness of motor torque axis and middle transition torque axis in consideration, in the same length of torque axis in motor and middle transition, when the motor torque diameter ranges from 39 mm to 41 mm and the middle transition torque diameter ranges from 42 mm to 44 mm, the efficiency of gear transmission in thin seam shearer is improved for the smooth and stable working performance, little vibration and well general effect, after the dynamic simulation analysis of gear transmission in thin seam shearer by ADAMS. Besides, based on the dynamic simulation analysis of shaft strength in ending planetary mechanism to planetary mechanism, fluctuation of engaging force in each gear is relevantly small, so is the vibration, when the transmission shaft outer diameter is 80~82 mm, and the inner diameter is 35 mm.