Before entering the main bearing of the ball mill, the cylinder, end cover and large ring gear must first be assembled. Before assembling the cylinder and the end cover, the cylinder should be inspected. Its ovality should not be greater than four thousandths of the cylinder diameter. The allowable error of the ovality of the cylinder flange should comply with the design regulations. Also check the surface finish and ovality of the hollow journal. If the requirements are met, apply mixed lead and lead oil on the end cover seam and cylinder flange, and then align according to the marks. After alignment, install all the positioning pins. When the position is adjusted, tighten the bolts evenly. In this way, the cylinder and end cover are assembled. When the two halves of the large ring gear are joined, the ball mill rotary body is usually installed on the main bearing and then the large ring gear is installed.
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