The causes of jaw body damage of jaw crusher are wear of inner hole, fracture of spring rod hook and local crack or fracture. The inner bore wear is mainly caused by the loose fit of the bearing outer sleeve, the abnormal operation of the bearing or the material defects. The main reasons for the fracture of spring rod hook are casting defects, material fatigue and hook overload. The main reason of local crack or fracture is that the material fatigue cracks or jaw crusher overload caused by long-term use, resulting in local crack or fracture of movable jaw. This paper will analyze these three aspects, then, the repair methods of jaw crusher jaw body damage are as follows:
1.Repair method of inner hole wear: build up a layer on the worn inner hole by manual electric welding, and then carry out reaming process to make the inner hole and bearing sleeve match reasonably. Bore the worn inner hole large, and then process the inner sleeve. The outer diameter of the inner sleeve fits tightly with the diameter of the inner bore after boring. The accuracy and tolerance of the fit between the inner bore of the inner sleeve and the outer diameter of the bearing are the same as the design requirements. Four to six stabilizing nails are installed between the bearing outer sleeve and the inner hole of the movable jaw.
2.Emergency repair of spring pull rod hook fracture: according to the different materials of moving jaw, choose different repair methods. For the movable jaw of steel casting, the broken part of spring rod hook can be made into groove by gas cutting or grinding wheel, and the hook can be directly welded by manual arc welding. Generally, cast iron welding rod is not used to weld the movable jaw of steel casting, but a steel casting hook with the same size needs to be made again. Weld a steel plate of appropriate size at the end of the new steel casting hook, drill 4-8 small holes with diameter of about 18mm around the steel plate, and then grind and drill the remaining hook part on the movable jaw body, corresponding to the drilling size of the steel plate at the end of the new hook, and then fix the newly made hook on the movable jaw body with screws.
3.Repair of local crack or fracture of moving jaw: jaw plate (also called tooth plate) is installed on the movable jaw of jaw crusher, so the moving jaw is not easy to be damaged. If the cracks are not too large, the repair welding process can be used to repair the local cracks or fracture of the moving jaw body due to overload and other reasons; if the cracks are large, and the through cracks or the moving jaw plate has been broken, the method of replacing the moving jaw body is appropriate to resume production (this phenomenon generally does not occur).
As a supplier with nearly 30 years' manufacturing, Shuguang Heavy Machinery also produces and sells hammer crushers, impact crushers, vertical shaft crushers, cone crushers, compound crushers, Raymond mills, high pressure mills. Powder machine, vertical mill, ultra-fine grinding machine, ball mill, double-shaft shredder and other heavy equipment crusher. Feel free to contact us for more details.
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