How to correctly install turntable bearings?
Preload bolts: three steps should be staggered, pre tightening, the three steps are 30%, 80%, 100%. E it is important to adjust the gear backlash correctly when adjusting the gear backlash and installing the slewing bearing with teeth. Beating the highest point in the radial gear with feeler adjustment, can also lead wire or other suitable method. If the backlash is not within the specified value, the pinion can be moved to change the center distance. After setting, turn the turntable bearing at least one full circle to make sure there is no other gear jumping high point, and check the backlash once the turntable bearing is finally fixed. The highest point of the radial runout of the gear is marked with green paint in the groove. F, lubrication 1, raceway lubrication, in order to ensure the full lubrication, before the initial use, should be added to a drawing or product instructions instructions grease. Pay special attention to all the grease nozzles. One by one, grease is injected. It is best to grease the rim of the turntable while the grease is removed. 2, gear lubrication, gear lubrication, the tooth surface should be clean. It is recommended that the grease be brushed on the gears with a clean brush.
The inner and outer raceway of the C slewing bearing has a soft belt, which should be placed on both sides of the main load plane. That is, stagger 90 degrees with the main load area. There is a block or a "S" mark on the soft belt. It will also examine the slewing bearing and the mounting surface of the anastomosis, usually by foot inspection, if the agreement is not good, to be filled with the appropriate materials. After the turntable bearing is installed, welding operation on the support is prohibited. D, solid bolts 1, installation bolts selection: should use the specified (size, quantity, strength level, etc.) installation bolts and washers. Another note: 1) cannot use the screw bolt 2) do not use the old bolts and washers, 3) prohibit the use of openings such as elastic washers, washer 2 bolt tightening torque: choice of preload of ordinary metric bolt take 0.6-0.7 times the yield strength of bolts. Bolts recommended greater than M27 shall be hydraulically tightened and shall not exceed 85% of the yield strength. 3. Fastening bolts: slewing ring bearings should be installed without load. Caution: apply a little oil to the thread of the bolt to ensure a balance of frictional resistance. Do not use glue on the bolts.
First, open the turntable bearing package, check the certificate and signs, confirm that the turntable bearings are of correct type. A, installation plane, installation surface should be bright and clean, to remove all the excess material, such as paint residue, welding bead, burr and so on. When cleaning, be careful not to let the solvent penetrate into the inside of the turntable bearing, and the solvent that damages the sealing material can not be used. The surface should be dry and no lubricant before assembly. Measures should be taken to protect workers and the environment. The mounting surface roughness of the mounting support shall be no more than Ra=12.5,6.3 mu m, and the circumferential error and radial error shall be detected in the flatness of the mounting surface. The circumferential flatness tolerance value corresponds to the standard value range with the raceway raceway diameter of the turntable bearing. In order to avoid the installation of flat roughness or bearing deformation, resulting in local overload of slewing bearings, the circumferential flatness error in any 180 degree range can only have a wave fluctuation, and change gently. The rigidity of B, bearings, standard turntable bearings and zero gap slewing bearings have different requirements on the rigidity of bearings.
