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Crankshaft inspection methods and requirements of engineering cranes

2020-11-02

Crankshaft maintenance methods and requirements of engineering cranes: the radial runout of the crankshaft and the radial runout of the thrust face on the common axis of the main journal must meet the technical requirements. Otherwise, it must be corrected. Check the hardness requirements of crankshaft journals and connecting rod journals, which must meet the technical requirements. Otherwise, it should be reprocessed to meet usage requirements. If the crankshaft balance weight bolt is cracked, it must be replaced. After the crankshaft replaces the balance block or balance block bolt, it is time to conduct a dynamic balance test on the crankshaft assembly to ensure that the unbalance amount meets the technical requirements. Wear-resistant electrode.

(1) Disassemble and clean the crankshaft components to ensure that the internal oil passage of the crankshaft is clean and unblocked.

(2) Perform flaw detection on the crankshaft. If there is a crack, it must be replaced. Carefully check the crankshaft main journal, connecting rod journal and its transition arc, and all surfaces must be free of scratches, burns and bumps.

(3) Check the crankshaft main journal and connecting rod journal, and repair them according to the repair level after the size exceeds the limit. The crankshaft journal repair is as follows:

(4) Check the hardness requirements of crankshaft journals and connecting rod journals, and they must meet the technical requirements. Otherwise, it should be reprocessed to meet usage requirements.

(5) The radial runout of the crankshaft and the radial runout of the thrust face to the common axis of the main journal must meet the technical requirements. Otherwise, it must be corrected.

(6) The parallelism of the connecting rod journal axis to the common axis of the main journal must meet the technical requirements.

(7) When the front and rear transmission gears of the crankshaft are cracked, damaged or worn seriously, the crankshaft should be replaced.

(8) If the crankshaft balance weight bolt is cracked, it must be replaced. After the crankshaft replaces the balance weight or balance weight bolt, it is time to conduct a dynamic balance test on the crankshaft assembly to ensure that the unbalance amount meets the technical requirements. Wear-resistant electrode

(9) If the flywheel and pulley bolts are cracked, scratched or the extension exceeds the limit, replace them.

(10) Carefully inspect the shock absorber of the crankcase foot. If it is damaged, rubber is aging, cracked, deformed or cracked, it must be replaced.

(11) When assembling the crankshaft, pay attention to the installation of the main bearing and thrust bearing. Check the crankshaft axial clearance and tighten the main bearing cap vertical bolts and horizontal bolts as required.