Is the selected bearing reasonable? The basic dynamic load h of the bearing is the life factor of the roadheader when the sweeping time is more than 90, the life factor is selected according to 66001, then 2.17; the proportion of the drilling time of the roadheader is less than 10, the life factor is selected according to 6601, the penetration rate is 1.085fn speed Factor, take = 1.8 cutting speed is 23 m torque load factor, torque load is large, take 2; d impact load factor and force =; Cr to select the basic dynamic load of the bearing, the equivalent dynamic load of the spherical roller bearing Calculated coefficient spherical roller bearing 24048 = Z radial dynamic load factor, 1 = 0.67; Y axial dynamic load coefficient spherical roller bearing 24048 boring machine cutting section when sweeping 3, according to the cutting head to make up and down The force analysis of the cutting motion or the left and right sweeping motions shows that when the cutting head is doing the downward cutting motion, because the gravity of the cutting part is to be overcome, the cutting head is subjected to the greatest force, that is, the cutting head of the factory is mainly subjected to the cutting head. It is the radial force axial force is negligible. Then, the force ≈F1 of the radial force distributed to the inner bearing of the cutting portion is calculated according to the formula 1 = 148589.8 to satisfy the use requirement. ≈F1 calculates 1 485.898 according to Equation 1 to meet the requirements for use. When the cutting part is drilled, the cutting main bearing is mainly ignored by the axial force and the radial force is negligible, that is, the axial force 疋 is equal to the axial force of the cutting head=164.0421, then two kinds of conditions under this condition are calculated. The basic dynamic load rating of the bearing, 165.9, does not meet the requirements for use. 400.959, so the selected bearing 32048 meets the requirements for use. 4 Conclusion analysis, the selected spherical roller bearing 24048 can not meet the requirements of use under the conditions of the drilling machine, because the axial force is too large, the bearing only has the column roller to bear the load. In addition, the slippage phenomenon occurs, which causes the single row of rollers to be subjected to large force and damage. Therefore, the tapered roller bearing 32048 is selected as the main bearing of the roadheader. Cheng Daxian. Mechanical design manual ruler. Beijing Chemical Industry Press, 2004. Huang Riheng. Cantilever vibrating machine elbow. Xuzhou China University of Mining and Technology Press, 1996. College of Materials, Mechanical Engineer of Heavy Equipment Co., Ltd., engaged in roadheader to calculate the basic dynamic load air compressor noise of two kinds of bearings under this working condition and its test and research on air compressor noise from Dongtan Coal Mine of Yanzhou Mining Group Corporation The research on the principle, test characteristics and evaluation has provided a scientific basis for the control of air compressor noise and improved design. The noise of air compressor includes dynamic noise, electromagnetic noise, mechanical noise and its radiated noise. The frequency is wider and the higher the low frequency is prominent. It increases with the increase of input power and is related to the pressure and displacement. The noise measurement uses the sound pressure level method. When the air compressor is not running, the background vocal level is measured at a measuring point, and the sound level of the octave band is 1.563125250500lK2K4K8K9. When separately measuring the noise of the suction port, the suction port should be separated from the machine or led out by a pipe. The measuring point is 45m away from the center of the suction port, and the sound level and the octave band sound pressure level are measured. The sound level readings of the sound level and the octave band on the measuring point should be greater than the background noise and the corresponding octave sound pressure level reading 10. If it is greater than 9448, it should be corrected according to the relevant parameters, and if it is small, the measurement will be invalid. After the measured readings are corrected for background noise, the average value can be calculated according to the relevant regulations. Li Jianfeng Paint Stripping Machine,Putty Sprayer,Airless Paint Machine,Electric Airless Sprayer Fuzhou HVBAN Mechanical Equipment Co., Ltd. , https://www.hi-sprayer.com