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冲击式粉碎机(锤式破碎机)

可分为锤式破碎机和反击式破碎机。冲击式破碎机中有一高速旋转的转子,上面装有冲击锤。当物料进入破碎机后,被高速旋转的锤子击碎或从高速旋转的转子获得能量,被高速抛向破碎机壁或特设的硬板而被击碎。

该机的优点是结构简单,设备紧凑,处理能力大,破碎比大,功率消耗小,维护、修理和更换易损件容易,产品粒度较均匀,过粉碎少。

缺点是锤头、篦条、衬板和转子圆盘磨损较快,特别是破碎较硬物料时磨损更快,当破碎物料的水分含量超过12%或含有粘土时,它的篦条缝隙容易堵塞,从而降低生产率,且增加能量消耗和锤头等零件的磨耗。

滚筒破碎机(碎煤机): 该机为穿孔圆筒,内部设有倾斜提升板,转动过程中将煤块提升至顶部后抛落,靠煤块自身重量冲击破碎。破碎后的细颗粒从孔板中排出。

Review of the last lesson

Secondary Crushers

The cone crusher is a modified gyratory. The essential difference is that the shorter spindle of the cone crusher is not suspended, as in the gyratory, but is supported in a curved, universal bearing below the gyratory head or cone .

The mode of operation of roll crushers is extremely simple, the standard spring rolls consisting of two horizontal cylinders which revolve towards each other. In impact crushers, comminution is by impact rather than compression, by sharp blows applied at high speed to free-falling rock.

The rotary coal breaker is very similar in operation to the cylindrical trommel screen, consisting of a cylinder of 1.8-3.6 m in diameter and length of about 1.5 to 2.5 times the diameter, revolving at a speed of about 12-18 rev min-1.

Lesson5

Grinding mills

根据磨机筒体内装入介质类型的不同,分为: a. 球磨机:装入的研磨介质是钢球或铁球。 b. 棒磨机;筒体内装入的研磨介质是钢棒。 c. 砾磨机:装入的介质是砾石。 d. 自磨机:靠矿石中大块自磨。 根据磨机筒体的形状,分为:

a. 短筒型磨机,其长(L)径(D)比小于等于1-1.5。

b.长筒型磨机,其长(L)径(D)比大于等于1.5-2;当二者比值更大时,例如5~6时则叫做管磨机。 c. 圆锥型磨机。