November 1, 2010
Screens on the move
Portable screens allow more flexibility and versatility in an aggregate operation
By Kerry Clines, Senior Editor
Tracked screens are equipped to follow the deposit around a quarry, shortening haul truck cycle times, or doing away with them completely.
Metso’s Lokotrack ST272 is capable of producing three end products simultaneously and accepts feed material of up to 2 feet in size. The scalping screen accepts a wide range of screen media. The IC300 intelligent controller provides user-friendly operation and fully automated control of all functions.
Kleemann’s Mobiscreen plants produce multiple aggregate sizes with fixed or swiveling discharge belts and tailored screening surfaces that range from 8.4 square yards to 22 square yards. The units are available in double- or triple-deck designs, with or without a feed hopper, as a banana screen, and other configurations.
Sandvik’s QA450 offers a triple-deck screen box and an extra side conveyor that enables it to produce up to a total of five product materials. It incorporates a large feed hopper, a pair of large screen boxes, and extended conveyors with large stockpiling capabilities.
Road-portable screens offer even more versatility with the ability to not only move around the quarry, but to move from one quarry to another.
The Terex Simplicity TXW616T features a 6- by 16-foot, triple-deck inclined screen. Twin 36-inch by 25-foot dewatering screws maximize screen capacity. An I-beam main frame with two manual landing jacks and four cribbing legs provide stable operation and mobility. Walkways around three sides allow easy access to the machine.
GreyStone’s self-erecting screen tower is a horizontal, vibrating, three-deck wet screen that raises and lowers with the push of a button, taking less than two days to tear down and set up. It can act as a primary screen for 6-inch minus material or a secondary or tertiary screen for larger material and can stockpile up to three material sizes simultaneously.
The Grasan 620HD-H 6- by 20-foot, triple-deck horizontal screen plant has a three-shaft, between-deck drive unit; side discharge conveyor; under-screen fines conveyors; extra heavy-duty frame; and walkways on three sides. The unit is mounted on a tandem axle trailer. Travel dimensions are 51 feet, 4 inches in length and 13 feet, 6 inches in height.
Custom designed portable screen plants help meet the needs of individual customers and quarries.
Universal designed this dual screening plant with two 7- by 20-foot, triple-deck screens for a customer that moves equipment several times a year. The customer needed a plant with a five-pack conveyor arrangement between screens, the ability to blend the collecting conveyors under the screens, and the option of adding a pre-screener.
Masaba works hand-in-hand with customers to custom-design and fabricate a wide range of screening plants. All screens come with a heavy-duty chassis design, fully installed and tested switchgear, reversible cross-conveyors, and a custom-designed catwalk.
Mettler Toledo North America
Mettler Toledo’s new VTC221 (concrete deck) and VTS231 (steel deck) vehicle scales have concentrated load capacities of 100,000 pounds, gross load cell capacity of over 800,000 pounds, and incorporate the Powercell PDX load cell network. Other features include a low profile design, onboard diagnostic capability, and lightning protection.
Cardinal Scales’ portable electronic EPR-LF+ Plus self-contained vehicle scale is contained in modules, which are furnished with lifting eyes for easy moving. Load cell wiring is furnished with quick connections for easy installation and removal. The scale features a checkered steel deck and 16-inch overall low-profile height.
Rice Lake’s Survivor truck scales are designed and built with heavy-duty, high-grade structural steel I-beams for rigidity. The company says the 5/16-inch deck plate on OTR and ATV steel deck models prolongs the life of the scale.