Two types of mill door.
Cover mill gate in Figure 21 (a) below. The prominent advantage of the cover mill door is exactly the same mill door liner and cylinder liner. (A) the cover type; (b) provided for
Cover type, the holes along the cylinder liner around suspended manhole 11 ~ 12mm, even though the cover and lining of the mill door hanging some contact has no effect on the lining strength. Generally only need to remove the mill gate maintenance,aggregate processing equipment loading and unloading of the grinding media can, if necessary, can be around the manhole liner removed. Is the maximum size of manhole.
Figure 21 (a) shown in the structure of the mill door is directly fixed with bolts, structural loading and unloading mill door when required to all the bolts unscrewed the time-consuming and inconvenient.
Another fixed mill gate way is to set the T-shaped slot in the manhole frame peripheral T-head bolt mill door, so I turn the only a few buttons nut can be tightened or loosened to remove the bolt.
Provided for grinding door as shown in Figure 21 (b) below. Provided for grinding door there are two structures: one is to cast one of the mill door and mill door liner, this structure applies only to the high toughness and wear-resistant materials (of ZGMn13, etc.).
Another structure is to separate the mill door and mill door liner manufacturing, as shown in Figure 21 (b) below. The mill door liner bolted the door of `manufactured in steel or cast steel mill on the mill door and then use the bow-shaped frame and then fixed to the cylinder. Provided for multi-oval manhole.
(4) cylinder axial thermal deformation
Mill operation and long-term shutdown,concrete recycling equipment the barrel length is not the same. Cylinder work and shut down when the temperature changes caused by thermal expansion and contraction phenomenon. 87% of the mill power transformed into heat, so that the cylinder temperature; cement mill and sometimes into the grinding clinker high temperature heat is passed to the cylinder; of drying chief grinding ball mill, used for drying materials of hot air, heat a large part of the pass tube. Therefore, in the design, installation and maintenance must be considered when a tube of thermal expansion and contraction phenomenon.
The discharge side of the general mill near the gear, in order to ensure the normal engagement of the gear, and thus is not allowed at the discharge end of any axial movement, and therefore has to adapt to the axial thermal deformation of the structure are the feed side. Consider the cylinder axial thermal deformation in two ways: one is reserved for the gap between the shaft shoulder and bearing of the hollow journal to consider,rotary kiln dryershown in Figure 22 a, b for the reserved space on the mill structure. Such a structure is widely used.
mill door,cover mill,cylinder
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