Road NetworksDuring the plant erection stage, plans should bemade for the layout of roads. Well-planned roads areneeded to prevent congestion, decrease the time haulunits are in the plant, and for safety. Road networks areneeded for the following:1. Haul units bringing rock from the quarry2. Trucks hauling the product aggregate toconstruction sites3. Service vehicles, such as crew, fuel, andmaintenance vehiclesIf possible, plant roads should be one way and bewide enough for the largest haul unit expected. Theyshould be designed to support heavy loads.Plant roads must be maintained constantly. In dryareas where there is little rainfall, a water truck isrequired to wet down the roads to control the dust. Inwet areas crushed rock should be used on the roads tokeep haul units from sliding off into ditches. Amaximum speed limit should be posted for vehiculartraffic within the crusher area and on the haul roads.PLANT ERECTIONThe importance of proper site preparation andproper stationing of the plant cannot beoveremphasized. Your site for stationing the plantshould be flat, level, and well compacted. Crushing andscreening plants may be operated for short periods oftime from the wheelbase. But it is advantageous onlonger and more deliberate jobs, from a maintenancestandpoint, not to operate the plant until it has beenblocked and leveled with the tires clear of the ground.You should include the following steps in theoperational start-up phase:Operating instructions. All appropriate technicalmanuals must be reviewed and studied before thebeginning of plant operations.Training. You should train all personnel assignedto operate and maintain the plant. During this trainingperiod the importance of site preparation, setup,maintenance, and safety should be emphasized. Youshould keep the proper tools, materials, and manuals atthe site. A high rate of aggregate production should notbe expected until personnel become familiar with theequipment.Tools. The tools used in maintenance and assembl yof the plant are included in the mechanic’s tool kit whichis part of the NCF TOA. Basic issue items that areincorporated with each plant are also available.Leveling. The plant should be leveled before initialoperation and should be frequently checked while inoperation. Leveling should be done on the frame forlongitudinal leveling. A rigid, straight plank should beused across the unit frame rails for transverse leveling.The leveling should be checked at several pointsthroughout the unit.Blocking. Blocks should be installed under eachside of the tandem axles and under the dolly axle or thefifth wheel plate to raise the tires or landing gear clearof the ground. Place blocking or cribbing parallel to thelongitudinal center line of the unit.Hydraulic jacks. Jacks should be on each side ofthe unit opposite each other and under the unit framemembers. Raise and lower the jacks in equal incrementsto prevent bending of the frame.Screw type of stabilizing jacks. Tighten the screwtype of stabilizing jacks to maximum torque after thecrusher has been blocked and leveled.retorquingshouldbecontinuedthroughouttheNuts and bolts. Ensure all bolts are tight bytorquing the nuts, not the bolt heads. Additionally,operationoftheplant.This should be performed atcritical locations and during the initial operation toassure proper seating and prevent parts from looseningand getting out of adjustment. Any adjustmentsrequired, such as movement of trunnion wheels on thetrunnion shaft, should be made during the first hours ofoperation.Jaw plates and roll shells are held in place bywedges which are secured by keeper bolts. The wedgesmust be driven home with a sledge hammer whileconstantly applying torque with the wrench to achieveproper tightening.Visual inspection. To prevent damage and eventualbreakage, you should visually inspect the plantconstantly to detect any misadjustment or loss ofadjustment. Visual inspections should be made fromground level, from the platform, and from walkways.All adjustments should be checked with the componentsoperating while empty and rechecked while loaded withaggregate.75-tph PlantThe 75-ton-per-hour plant is used in any of fourbasic setups, depending upon the raw material available6-15
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