Small crane slewing bearing maintenance skills

Small crane slewing bearing maintenance skills - 2019 01 - 24 small crane slewing bearing device usually adopts rolling bearing type, the structure form is the same as the rolling bearing. The main characteristics of the device, it is compact structure, convenient assembly and maintenance, dustproof and good lubrication condition, the axial clearance is small, small rotary resistance, long service life. For bearing ring structure, the center of the channel between hop on and off for power, information transmission and the overall fabric coffret provides a good convenient conditions. But the device requires frame and rotary table structure is very rigid, ensure support device of the rolling element and raceway contact is in good condition. In addition, due to material freely and the processing technology of the demand is higher, so the high cost of rolling bearing type rotary support device. So in use at ordinary times, should pay attention to its maintenance and maintenance. （ 1) The installation of the slewing ring bearings ( Bearing ring gear under the bottom of the seat and placed on the inner race on the surface of the seat) Must have enough rigidity, small crane installation surface to level off. Before assembly rotary bearing support should be to deal with the stress, reduce the deformation of the rotary bearing pedestal. When assembling bearings and slewing bearing contact surface must be clean. （ 2) The change of noise should be paid attention to in using and the change of the steering resistance moment, if there is any abnormal phenomenon should overhaul. （ 3) The slewing bearing must be horizontal lifting or store, not vertical lifting or storage, so as to avoid deformation. （ 4) Before bolts completely tight, should be checked for gear meshing, the meshing condition should accord with the requirement of precision gear: namely the gear pair under slight brake operation after the distribution of the tooth surface contact spots on the direction of tooth height not less than 25%, not in the length of the tooth direction is less than 30%. （ 5) Tooth surface work 10 flights a sundries shall be removed, and then coated with grease. （ 6) In order to ensure the working reliability of the bolt, to avoid the shortage of the bolt pre-tightening force, crane slewing bearing the first 100 hours and 500 hours of work, after all should check the bolt pre-tightening torque, respectively. Since every work 1000 hours should check the pre-tightening torque. （ 7) Connected to the rotary bearing bolts and nuts adopt high strength bolts and nuts; Adopt double nut fastening and locking. （ 8) Tighten the nut, threads of the bolt and nut facing with lubricating oil, and should use the torque wrench in the circumferential direction is symmetrical evenly tighten many times. Finally tighten again, each bolt pre-tightening torque should be roughly uniform. （ 9) On the ring gear of rotary bearing surface on the part of the raceway uniform 4 oil cup, adding grease to the race. In general, slewing bearing lubrication work 50 hours. Every time come on foot, must until leaking from the seal oil.