The most difficult part of repairing a jaw crusher is the disassembly and assembly of the movable jaw structure. The movable jaw plate bearing cavity is divided into three sections. The two ends are in the bearing matching holes, and the middle is a transition hole. There is a small step at the intersection of the transition hole and the bearing hole. When disassembling the eccentric shaft, because the 3000 series bearing has an automatic self-aligning function, the bearing often gets stuck at the small step, which can easily damage the bearing cavity and even destroy the bearing, causing great inconvenience to the repair work. The following is a brief explanation of how to conveniently disassemble and assemble the movable jaw plate of a jaw crusher.
First, you need to make a bracket for the idle movable jaw. The length and width of the bracket are suitable for the size of the passive jaw. The height of the bracket must exceed the length of the eccentric shaft on one side of the movable jaw. The bracket structure is firm and reliable. After the movable jaw is placed on it, it will not shake when pushed by hand. A lifting hook should be set above the movable jaw bracket (maintenance personnel can make a fixed lifting hook on the indoor building, make a gantry, and make a fixed lifting hook on it or a tripod fixed lifting hook). The distance between the hook and the upper plane of the bracket exceeds the diameter of the movable jaw, plus the length of the vertical axis and the minimum working height of the hand chain hoist. The hook is used to hang the hand chain hoist.
Before disassembly, the movable jaw plate should first be removed from the pulley and flywheel, and the mast support shaft should be set into a tree cover, etc. Then, the movable jaw plate should be placed on the bracket and supported securely, and then the upper movable jaw cover should be removed. The eccentric shaft end usually has a shaft end cap screw hole. Install a lifting ring on this screw hole (it can be disassembled on a scrapped motor), and pull the hand chain hoist to hold the ring (the hand chain hoist and the eccentric shaft are kept on the same plumb line).
After the preliminary work is done, the cutting wire used for cutting the steel plate should be heated on the movable jaw plate at the corresponding bearing position (it is recommended to use bottled acetylene gas to keep the heating process non-continuous), and the heating should be uniform. Do not stay at a certain position to damage the movable jaw plate. The heating time is usually about 40~50 minutes, and the heating time at the upper bearing position should be slightly longer. After the heating is completed, the eccentric shaft and bearing can be easily lifted out of the movable jaw cavity by pulling the hand chain hoist.
The same heating method is adopted for assembling the movable jaw plate. A movable jaw end cover is installed at the lower end of the movable jaw plate, and a round steel plate is installed at the upper end of the movable jaw cavity. It is supported by several thick iron wires, leaving a little gap. Then the ignited cutting torch is inserted into the jaw cavity through the hole in the middle of the lower movable jaw cover. Zhongyu strongly reminds you to pay attention to the vertical upward flame of the cutting moment, and it must not be biased towards the surface of the movable jaw cavity hole. The flame must not have soot. The heating time is usually understood to be 50~60 minutes. For the sake of safety, the surface of the movable jaw plate corresponding to the bearing position can still be heated for 5~10 minutes after removal and then assembled. The eccentric shaft of the bearing (the required amount of lubricating oil can be applied in the middle) is put into the movable jaw cavity by hand pull hoist. The bearing must not be biased, and then the upper movable jaw end cover is installed.
The method of heating with cutting torch flame can be used to disassemble and assemble the dynamic body system. Similarly, it can also be applied to the disassembly and assembly of other tubular structures, such as couplings, etc. It only consumes a little oxygen and acetylene gas and does not damage the machine. It is economical and effective.
specialized in R&D and manufacturing of crushing, milling, screening, feeding, conveying, automation and other equipment.
