PORTABLE rock crusher FOR TRAILS
Portable rock crusher background
One of the earliest machine-driven rock crushers was built in the 1960s. It was tricycle mounted, its jaws were too small to be effective, and it had a tendency to jam.
In 2003, Dick Dufourd from the Deschutes National Forest in U.S. Department of Agriculture Forest Service Region 6 requested, through the Recreation Steering Committee, that the San Dimas Technology and Development Center (SDTDC) develop a mobile trail rock crusher with 6- to 8-inch adjustable jaws that would operate from a trail dozer’s hydraulic system.
THE BICO CRUSHER
SDTDC’s product search located the Braun Instrument Corporation (BICO) electric Badger jaw crusher (a laboratory crusher) that could crush a 6-inch rock. This crusher was chosen for further evaluation because of its lighter weight and its hopper that shields workers from flying rock fragments.
The BICO jaw crusher produced pulverized to w-inch material. SDTDC personnel worked with designers at BICO to enlarge the space between the jaws to effectively crush a 7-inch rock. Now the jaw space on the BICO crusher can be adjusted to produce 2- to w-inch crushed rock.
The original electric motor on the BICO crusher was replaced with a hydraulic motor. A quickcoupling hose mechanism attaches the crusher to the dozer’s hydraulic system. A mount was manufactured to attach the crusher to a standard 3-point hitch. SDTDC used a Sweco Trail Dozer for this project. The crusher is mounted on the rear of the dozer. Also, a stand was designed and built that allows the crusher to stand alone and operate when hooked to an alternate hydraulic source. Care must be taken when using the crusher in the stand-alone mode because it may move (see electric motor test).