Practical wire rope information and useful information on the drag-line cableway excavators . peration allows the carrier and bucket to travel down theinclined track cable by gravity; the speed of the carrier and bucketis controlled by the brake on this friction drum. When the pointof excavation has been reached the operator holds the bucket andcarrier by means of the brake on front drum and then releases therear drum. By releasing the rear drum the track cable is slackenedand the bucket and carrier are thus lowered into the pit. Whenthe bucket comes in contact with the material, the operator
Practical wire rope information and useful information on the drag-line cableway excavators . peration allows the carrier and bucket to travel down theinclined track cable by gravity; the speed of the carrier and bucketis controlled by the brake on this friction drum. When the pointof excavation has been reached the operator holds the bucket andcarrier by means of the brake on front drum and then releases therear drum. By releasing the rear drum the track cable is slackenedand the bucket and carrier are thus lowered into the pit. Whenthe bucket comes in contact with the material, the operator puts thefront drum into operation by throwing in the friction. This pullsthe bucket forward into the material and fills it. After the bucketis filled the operator throws in the friction of the rear drmn. Thisoperation tightens the track cable and thus lifts the bucket clearof the excavation. The bucket is pulled forwardly at the same timethat the track cable is tightened, and in this way the bucket is con- —30— ?^ / > 3 \^ c ^k z vK ow u,??^^^^. —31- veyed and elevated to the dumping point, where the load is dis-charged automatically. Conditions sometime require the load to be delivered and dis-charged at the foot of the inclined track cable, in which case theloaded bucket travels down the incline by gravity, the load is auto-matically discharged and the empty bucket is then pulled back upthe incline and then lowered into the excavation. Masts and Towers. For the small dragline cableway excavator, masts can ofttimesbe secured by cutting down a tall large tree and trimming same tomeet the requirements. Oak, long-leaf 3ellow pine or fir, freefrom large or unsound knots, will best meet the requirements. For the larger dragline cal^leway excavators masts are usuallybuilt up from stock timber and trussed with either rods or masts are also used where the requirements and conditionswarrant the expense. In designing a mast special attention mustbe given to stiffnes
Size: 958px × 2610px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidpracticalwir, bookyear1916
