Ball mill

[0031] Example :

[0032] Such as Figure 1~Figure 11 As shown, the cylinder 1 of the ball mill is provided with an annular support wall 6 corresponding to the position of each bolt hole 4, and a sound insulation cover 2 that matches the contour of the cylinder's revolving surface is provided with a plurality of matching annular support walls 6. Each hole wall is connected with each annular support wall 6, thereby forming a vacuumable sound insulation cavity 3 between the soundproof cover 2 and the cylinder 1, and a support column 7 is arranged between the annular support walls 6 and the support column 7 is The connecting lining board 5 supports the soundproof cover 2; on the cylinder 1, two upper and lower manholes 8 protruding from the rotating surface of the cylinder are respectively provided near the feeding end 13 and the discharging end 14, corresponding to the manhole 8 Two manhole covers 11 are provided at the position of, and the manhole covers 11 are slidably connected to the soundproof cover 2, the outer side of the soundproof cover 2 on the middle part of the cylinder is provided with a ring cover 12, and the ring cover 12 is rotatably connected to the soundproof cover 2, There is an overlapping part between the manhole cover 11 and the annular cover 12, and the overlapping part of the annular cover 12 is inside the manhole cover 11. As a result, a movable cover is provided outside the soundproof cover 2 The combination of the hole cover 11 and the ring cover 12 does not affect the bolt tightening operation of the ball mill after a period of operation, and can further reduce noise. The use of the cover can further reduce the noise to 30-40 decibels.