3. Repair Of Anchor Bolt Fracture
Because the stone diameter is too large, a large amount of stone is trapped in the crushing chamber of the jaw crusher, causing the crusher to stop. When restarting, the bolt is subjected to large shear force, which leads to fracture of the bolt under shear stress. Or jaw crusher by load vibration, foundation instability, bearing damage, eccentric load increase, bolt loosening, eventually lead to bolt fracture.
If the anchor bolts are often broken, the foundation has cracks, and the cracks are large, there are more hidden dangers to continue to use, must be stopped immediately. Remove the original concrete foundation, replace the anchor bolts, and re-cast the foundation. Remove the original anchor bolt concrete foundation, take out all bolts, and clean the working face; After aligning the base, replace all anchor bolts; Grouting the foundation of anchor bolts, install the machine after the concrete reaches the strength, and tighten the anchor bolts. After checking without error, proceed to the next procedure; Grout generally uses fine sand gravel concrete. 
4.Spindle Repair
The long-term subsidence of the foundation resulted in serious wear of the spindle on the upstream side. After removing the bearing on this side and lifting and dismantling the jaw, the measurement found that the shaft diameter at this end was 6-12mm smaller than that on the downstream side (due to uneven wear, the shaft diameter is already Non-perfect circle), resulting in multiple replacement of the bearing, the failure cannot be eliminated. Need to deal with the spindle.
Adopt the outer circle surfacing method, and use manual arc welding to evenly surfacing one layer on the worn bearing joint surface. The surfacing method of “small current, small bead, discontinuous” should be adopted during surfacing. For emergency repairs at the construction site, you can choose a skilled electric welder to weld 24 vertical seams evenly on the bearing. After the height is polished, the height is 5mm higher than the original shaft, and then touch some white ash on the 24 vertical seams, and sleeve the bearing. Where there are no traces of white and gray on the inner sleeve of the bearing, perform secondary polishing until it fits perfectly with the inner sleeve (ensure that the shaft at the place is a perfect circle), then it can be assembled and used.
Post time: Aug-27-2021