BR1000JG-1 mobile crusher Introduction
Various debris from construction work some dozen years ago: Concrete debris from demolished buildings, etc. Asphalt debris from road repairing work. Natural rocks from civil engineering work.
The debris was transpor ted to disposal sites. Environmental and economic problems occurred due to rising disposal costs from a shortage of disposal sites and transpor tation of debris and new aggregates by dump trucks.Under such social circumstances, in 1992 Komatsu introduced mobile crusher BR60 equipped with an impact crusher for the purpose of “on-site treatment of miscellaneous debris from the demolition of wooden houses”. In 1993, Komatsu developed BR200J-1 with increased capacity and equipped with a jaw crusher capable of disposing of large masses in large-scale demotion and civil engineering work to promote on-site recycling method.
Later the workability was improved by applying a three-way loading structure and a conveyor with increased discharge height. A vibratory feeder to remove muck, and automatic feeding control was installed to increase production. In August last year, Komatsu began the sale of BR380JG-1 equipped with a crusher of improved maintainability and operability through its own development. This machine continues to sell steadily.
On the other hand, separate from the field of disposal by crushing of debris from construction work , the following method has been conventionally adopted in the quarry field where the jaw crusher was originally used:
. After blasting, blasted rocks are collected by a bulldozer.
. Rocks are loaded on a dump truck by a hydraulic excavator or wheel loader and transported to a crushing plant .
At some sites where the benches height is large, an open chute method is adopted to drop blasted rocks with the bulldozer. As exploitation proceeds, however, distance between the working face and the aggregate production plant becomes greater causing the hiking of blasted rock transportation costs to the plant. To cope with the circumstances, a new method has been adapted by which a mobile crusher is arranged near the working face as the primary crushing equipment , and the primarily crushed rocks are transported by either a conveyor or a 10-ton dump truck to the secondary crushing plant and onward. At Komatsu we can carry out primary crushing at the working face, then transport the primarily crushed rocks over the conveyor with a combination of a mobile crusher BR1600JG and mobile conveyor BM2014C.Moreover, Komatsu proposed the following systems using mobile crushers in the quarry field:
New quarry development system
Enables efficient development of a new quarry by a combination of a mobile crusher and a loader, requiring no electric power supply or foundation work for fixed type crushing plant. Thus, primar y crushing can be done in a narrow space, and crushing site can be moved according to the quarry site formation after stripping.
Working face on-site production system
Enables production of aggregate in the working face and product delivery directly from there. mobile crushers perform primary and secondary crushing and crushed rocks are sorted with mobile screens within the working face. These mobile machines allow flexible movement from one working face to another. In addition, aggregate products can be transported in a 10-ton dump truck which requires minimum road construction, contributing to environmental load reduction.
Under those proposals, Komatsu has developed and marketed the large-type mobile crushers, BR500JG-1, BR550JG- 1, and BR1600JG-1. We have also developed and begun marketing BR1000JG- 1 equipped with a jaw crusher of the 48-inch class which is predominant in the quarry field.
Introduction of achievement methods
(1) The largest jaw crusher in this class A 50-inch hydraulic driven jaw crusher provides a large production capacity , largest in this class (inlet size of 1,260 x 1,000 mm)
(2) Large hopper and wide crusher discharge port Equipped with a large folding type hopper having a capacity of 8.2 m3, it enables loading using a hydraulic excavator of the 3 to 4 m3 bucket capacity class.
(1) Hydraulic lock cylinder is installed on the crusher Adoption of a special-structured lock cylinder has added the following functions:
. Automatic discharge clearance adjustment function Clearance adjusted by extending the cylinder (reducing clearance) or retracting (increasing clearance)
. Toggle plate protection function when the crusher is clogged with foreign material When clogged with foreign material, the cylinder piston forcibly slides to open the discharge clearance to release the load.
(2) BR1000JG-1 can reduce or increase clearance by controlling the lock cylinder in the crusher structure shown in Fig. 3. This can be effected by operating the monitor switch in the control panel operable from the ground. Since the discharge clearance detected by the sensor is displayed on the monitor, no discharge clearance adjustment jig is needed to check the clearance. This enables the operator to adjust the discharge clearance from the ground without riding on the machine.