Slewing bearing’s transportation、installation and mainten
一、load/unload and transportation/ storage
• Slewing bearing must be careful load and unload
• Transportation and storage to the level of placement is appropriate, must be placed on the dry storage room.
• Hoisting rings suitable screws, a standard manner, only once a collision, especially the radial direction of the collision
• The out surface of slewing bearing print the antirust,the safe time is about 6 mouths, for more than six months of storage (such as for accessories) should be rust-proof packaging for storage or to take other measures.
二、 the installation of Slewing Ring
1 、the requirements of mounting brackets
2) In order to prevent local overload slewing ring to ensure that their flexible operation, mounting bracket should be after all the welding processes to deal with the elimination of internal stress, and the installation of machining flat, its flatness (including the angle of horizontal deviation) should be controlled to some range. Table 2
Table 2 contains the angle deviation license, including the value of flatness
Raceway circle diameter |
安装支架平面偏差 P （ mm ）
mounting brackets surface center |
DL(mm) |
Single-row four |
双排球式支承 |
滚柱式支承 |
~1000 |
0.15 |
0.20 |
0.10 |
＞ 1000~1500 |
0.19 |
0.25 |
0.12 |
＞ 1500~2000 |
0.22 |
0.30 |
0.15 |
＞ 2000~2500 |
0.25 |
0.35 |
0.17 |
＞ 2500~4000 |
0.30 |
0.40 |
0.20 |
＞ 4000~6000 |
0.40 |
0.50 |
0.30 |
＞ 6000~8000 |
0.50 |
0.60 |
0.40 |
Note: Table 2 of the value of maximum 180 ° in the region of the fan-shaped to allow only one to reach the peak value, and 0 ° ~ 90 ° ~ 180 ° region to rise or fall steadily. Then suddenly drop or do not allow, in order to avoid peak load.
• Support should also be installed with good rigidity. In line with the maximum allowable under the control of deflection quantity should be provided in Table 3 range.
Table 3 and Xu's largest deflection in line with the amount under
4) bolt hole mounting brackets according to the GB/T5277-1985 intermediate processing precision and alignment slewing ring mounting hole.
2 、Mounting bolt requirement
1 ）slewing bearing bolt size used should be consistent with the provisions of GB/T5782-2000 and GB/T5783-2000, the intensity level GB/T3098.1-2000 provided not less than 8.8, and Under choose a suitable tolerance level of intensity.
2 ）Nut sizes should be in accordance with the provisions of GB/T6170-2000 and GB/T6175-2000, and its mechanical properties should be in accordance with the provisions of GB/T3098.2-2000.
3 ）bolt tightening means provided for by the host involved, should ensure a certain degree of prestressing force, unless special provision is generally because the bolt preload of 0.7 times the limit. When tightening the screw Department to allow a little coating of oil. Pretightening pretightening force or torque shown in table 4.
• washer GB/T97.1-1985 and size should be consistent with the GB/T97.2-1985, to be quenching and tempering treatment. Spring washers should not be used.
• the length of bolt clamping LK ≧ 5d (d-bolt diameter)
3、The slewing bearing installation
1) installed before the blackout slewing ring and stent installation datum plane must clean up, remove the oil, deburring, painting, and other foreign matter.
2) slewing bearing soft rolled with quenching (external marking "S" or plug the hole) should be placed in non-compliance with the District in line with the district or non-recurrent.
3) Lifting slewing ring in place, the application plug-foot two-dimensional fit checks flatness. If space should be re-machining,
Who are genuinely unable to process can be used to fill plastic gasket or partial charge, after tightening to prevent the bolt bearing deformation. Slewing bearing performance impact.
4) installation of bolts before tightening, according to radial gear pitch the highest point (three teeth coated with a green marking) side of space-conditioning, and tightening bolts after the first full ring gear teeth on the side of the check clearance.
5) Tighten bolts should be symmetrical in the direction of a row 180, and last through again to ensure that the bolt circle on the same preload.
Table 4 pretightening pretightening force or torque
螺栓规格
The bolt size
（ GB/T5782-2000
GB/T5783-2000 ） |
安装孔直径（ mm ）
mounting hole diameter |
螺栓轻度等级（ GB/T3098.1-2000 ） Mild grade bolts |
8.8 |
10.9 |
螺栓材料的屈服强度极限 σ smin(N/mm2)
Bolt material yield strength limit |
640 |
900 |
预紧力矩 MA （ Nm ） Preload torque |
M10 |
11 |
44 |
62 |
M12 |
13.5 |
77.5 |
110 |
M14 |
15.5 |
120 |
170 |
M16 |
18 |
190 |
265 |
M18 |
20 |
260 |
365 |
M20 |
22 |
370 |
520 |
M22 |
24 |
500 |
700 |
M24 |
26 |
640 |
900 |
M27 |
30 |
950 |
1350 |
M30 |
33 |
1300 |
1800 |
|
|
预紧力 FA(103N) Preload |
M33 |
36 |
293 |
412 |
M36 |
39 |
344 |
484 |
M39 |
42 |
414 |
581 |
M42 |
45 |
473 |
665 |
M45 |
48 |
553 |
777 |
M48 |
52 |
623 |
876 |
M52 |
56 |
749 |
1054 |
M56 |
62 |
863 |
1214 |
M60 |
66 |
1008 |
1418 |
Note (1) When the bolts do not meet size GB/T5782-2000 or GB/T5783-2000, the table values to be calculated separately.
(2) The bolt head clamping surface and the friction coefficient between the total u = 0.14, a little thread to清油Tu.
• Lubrication and maintenance to support
1,slewing bearing factory coated with a small amount of rolled in on the 2nd of the extreme pressure lithium based grease (GB/T7324-1994), the opening allows the user should be based on different working conditions, re-filled with new grease.
2,Roller Slewing Bearing grease should be added regularly. General ball bearing refueling every 100 hours running time, roller-type support refueling once every 50 hours, special working conditions, such as tropical, humidity, dust, and temperature difference between large and continuous work, lubrication cycle should be shortened. Long-term cessation of operation of the machine must also be added before and after the new grease. Each lubrication Raceway must be filled within the grease from the seal up to date with exudative Department. Note grease, it is necessary to slowly slewing ring, so that uniform filling grease.
3, tooth surface should be kept clear debris and to the grease coated.
4, factors that should be more comprehensive work, the user can choose according to the specific requirements of the best grease, such as the raceway can be Mobilux EP 2, Shell Alvania EP (LP) 2 grease.
5, slewing ring after the first 100 hours of operation should be to check the preload bolt, 500 hours after the operation to check each time it is necessary to maintain adequate preload.
6, the use of attention to the operation of slewing bearing, such as found in noise, the impact of a sudden power increase, should immediately stop inspection, troubleshooting, if necessary, to be seized demolition.
7, the prohibition of the use of wash water slewing bearing directly to water into the Raceway. Hard to prevent foreign bodies close to or into the teeth meshing zone.
8, regular checks of the well-sealed, and if found should be sealed to replace damaged bags. If it is found that reduction in time off.
