Composition and Usage Precautions of the Moving Jaw Section of a Jaw Crusher

The moving jaw section consists of the moving jaw body, eccentric shaft, cover plate, retaining ring, bearings, pulley, flywheel, etc.

The moving jaw body is a steel plate welded component. It undergoes heat treatment annealing to eliminate welding stresses. Grinding the weld seams further effectively eliminates defects caused by welding, thereby enhancing the strength of the moving jaw body. The front of the moving jaw body is fitted with a movable jaw plate. The upper part is suspended from the frame via the eccentric shaft and bearings, while the lower part is supported by the elbow plate, forming a hinge with it. Pulley wheels and flywheels are installed at both ends of the eccentric shaft to reduce the motor's rated power and prevent excessive fluctuations in rotational speed during operation. The flywheel stores energy during the idle stroke and releases it during the working stroke, thereby ensuring uniform motor load distribution. A protective plate is installed on the upper part of the moving jaw to prevent wear on the upper section and deformation of the bearing bore caused by feeding material, which could otherwise affect the service life of the moving jaw and the smooth disassembly of bearings and other components.

The front of the moving jaw body is fitted with a movable jaw plate and wedges. Both the movable jaw plate and wedges are high-manganese steel castings (wear parts) and must be replaced regularly based on the properties of the crushed material. When replacing the movable jaw plate, the wedges must be removed first. After removing the wedges, the movable jaw plate can be disassembled. The installation sequence of the movable jaw plate is the reverse of the disassembly sequence. First install the movable jaw plate, then install the wedge block. When the wear surface of the wedge block is worn, steel plates can be welded onto the wedge block to achieve the purpose of tightening the movable jaw plate.

The bearings on the moving jaw body and the frame are self-aligning roller bearings. The bearings are sealed with labyrinth-type oil seals. The bearings should be filled with 3# synthetic lithium-based grease ZL-3H or other grease with equivalent performance (note: different grades and types of grease should not be mixed). The amount of grease added to the bearings should occupy 2/3 of the bearing cavity volume. Lubricate once a week, and clean and replace the grease every six months. When replacing, clean the bearings with kerosene and refill with grease to 2/3 of the bearing cavity volume.

Note: If the equipment is used outdoors or in high-temperature environments, shorten the lubrication and replacement cycles. If the equipment is not used for an extended period, inject rust-preventive oil into the bearings, but replace with new grease when restarting.

The frame bearings use a tapered sleeve structure to connect to the main shaft. A large round nut is provided for disassembly. When disassembling, remove the outer retaining ring, install the provided round nut on the tapered sleeve, and tighten it inward. The tapered sleeve will automatically separate from the bearing inner ring, allowing the bearing and tapered sleeve to be easily removed.

The pulley and flywheel are connected to the main shaft using a tapered connection. During disassembly, simply remove the outer retaining rings of the flywheel and pulley, then use a steel wire rope to suspend the pulley or flywheel, and strike the inner side of the hub with a hammer to easily remove it.

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