Lesson 1/learning Event 3
crusher is set up at the source of material to be crushed. It is important that it be jacked up or cribbed so that the
rubber tires are off the ground, and level. It may be fed by some combination of headwall, chutes, and small
materials handling equipment. However, in many circumstances, feeding by hand labor will prove to be the most
practical method.
35-tph CRUSHING AND SCREENING PLANT
Function and Operation. The 35-tph plant consists of two relatively small, self-contained units. It is intended
primarily to produce material needed to support light construction, maintenance, and repair projects of combat
battalions.
The primary unit is used for initial reduction of quarry run rock and gravel (Figure 9). It is ideally
suited to processing gravel pit source rock. Due to the relatively small jaw cavity opening (15 x24 inches) it is
very difficult to reduce material to the ideal feed size by blasting in the quarry. The product of the primary
crusher is suitable for base course material without further processing.
FIGURE 9. MATERIAL FLOW THROUGH THE PRIMARY UNIT
OF A 35-tph CRUSHING AND SCREENING PLANT
The secondary unit is used to accept the product of the primary crusher. It accomplishes necessary
further reduction in particle size and screens the material into size ranges to meet specifications (Figure 10).
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