Protection and maintenance of slewing bearings on cranes
1. The mounting support of the slewing ring (the seat on the bottom of the support plate abs gear ring and the seat on the upper surface of the inner seat ring) must have sufficient rigidity and the mounting surface can be leveled. Before the assembly line slewing bearing, the support should be expanded to remove the ground stress to reduce the deformation of the slewing support. When assembling the line, the appearance of the support and the slewing ring must be cleaned up.
2. Dirt should be eliminated once for 10 trains during tooth surface work, and grease should be applied again.
3. In order to ensure the credibility of the bolt work and avoid insufficient bolt torque, the torque and torque of the bolt should be checked separately for the first 100 hours and 500 hours after the slewing ring work. Since then, the torque should be checked every 1000 hours of work.
4. In the application, attention should be paid to the change of noise and the change of rotating resistance torque. If there is an abnormal situation, it should be repaired.
5. When tightening the nut, grease should be applied to the outer thread of the bolt and the inner hole of the nut, and a torque wrench should be used to tighten the nut several times in a symmetrical and symmetrical direction. When tightening again, the torque and torque on each bolt should be approximately symmetrical.
6. The slewing bearing must be hoisted or stored horizontally, and must not be hoisted or stored vertically to prevent deformation.
7. Before the bolts are completely tightened, the tooth engagement of the transmission gear should be expanded and checked, and the tooth engagement should comply with the rules of the precision of the transmission gear: that is, the tooth surface touches all over after the transmission gear pair operates under a mild braking system. The black spot is no less than 25% in the aspect ratio of the transmission gear, and no less than 30% in the length and short aspect of the transmission gear.
8. The bolts and nuts connecting the slewing ring are all high-strength bolts and nuts; double nuts are used for tightening and tightening.
9. The upper surface layer of the abs gear ring of the slewing bearing is directed to the direction of the dovetail rail to distribute 4 oil marks, thereby adding lubricating grease to the dovetail rail. The relevant professional and technical personnel explained in detail that under normal circumstances, the slewing ring runs for 50 hours and is lubricated once. The oil must be filled up every time until the vegetable oil has leaked from the sealing place.
Installation and disassembly of crane slewing bearing
1. Before installation, the installation reference point of the slewing ring and the installation plan of the support frame must be cleaned up neatly to remove oil stains, vibration lines, paint and other dirt.
2. The heat-treated soft belt of slewing dovetail guide rail (outside mark "S" or blocking hole) should be placed in the non-load area or the normal load area.
3. After the slewing bearing is hoisted in time, use a feeler gauge to check that it fits the plan
4. Before the installation bolts are tightened, the flatness of the peak axial vibration according to the pitch circle of the transmission gear. If there is vacant land, mechanical processing should be carried out again. If it is really impossible to produce and process, plastic filling or part of the gasket can be used to avoid deformation of the support plate after the bolts are tightened, which will harm the performance of the slewing bearing. (Three teeth coated with environmentally friendly paint logo) Adjust the tooth side space, and after the bolts are tightened, perform an inspection of the tooth side space on all abs gear rings.
5. Tighten the bolts should be continuously expanded symmetrically in the 180 direction. According to it, ensure that the bolts on the center of the circle have the same torque.
When disassembling and replacing, try to use the same well-known brand parts as the original product. The actual effect of this appearance is yes. Don't buy some products of unreliable quality because they are too expensive. That will always cause greater inconvenience for yourself.
In addition, in the whole process of the disassembly and replacement of the unfolding slewing bearing, people should be carried out by the technical professional personnel to actually operate the unfolding, not the actual operation at will, especially before the installation, be sure to remember to switch the power supply of all equipment All are disconnected, and the socket is immediately unplugged to ensure the safety of the actual operating staff.
