• slewing bearing loading
In the using circle,genelay the slewing bearing need to load the axial fax Fa、Fr M
slewing bearing required technical parameters
⑴slewing bearing basic dimension required；
⑵slewing bearing load situation ；⑶ the distribution of each load, that is, in each load and the percentage of operating time; ⑷ each load of Rotary to support the speed and number; ⑸ gear faced by the circumference of; ⑹ the host operating environment, That is, loading the smooth, and other occasions; ⑺ other.
Users can according to my company's product samples with the attached static load curve, in accordance with the rotary bearing the Selection calculation of the initial choice of the rotary bearing, and then with my company to confirm. Alternatively, you may need your products and relevant information provided to us by our selection for you to make and design.
Slewing bearing numbering (click to enter)
• 01 Series slewing ring bearing capacity curve (click to enter)
02 series of slewing ring bearing capacity curve (click to enter)
11 series of slewing ring bearing capacity curve (click to enter)
13 series of slewing ring bearing capacity curve (click to enter)
Each type corresponds a slewing ring bearing capacity curves, curves can help the user to choose an initial slewing ring.
Curves for two types of curves, one for the static loading curve (1 line), said slewing ring to maintain a static state will bear the greatest load. Slewing ring bolts for the other limit load curve (8.8, 10.9), which is the length of the clamping bolt diameter for bolts work 5 times pre-edge for the bolt material yield limit is set by 70 percent.
Slewing bearing selection calculation
• Static Selection
1) Selection of the calculation flow chart
I、a=45° II、a=60°
Fa'=(1.225*Fa+2.676*Fr)*fs Fa'=(Fa+5.046*Fr)*fs
M'=1.225*M*fs M'=M*fs
Static reference load Fa 'and M' is calculated as follows:
• Single-row four-point contact ball type:
Single-row four-point contact ball type slewing bearing selection calculation of the load angle, respectively, by 45 ° and 60 ° for both cases.
I、a=45° II、a=60°
Fa'=(1.225*Fa+2.676*Fr)*fs Fa'=(Fa+5.046*Fr)*fs
M'=1.225*M*fs M'=M*fs
Fa'=(Fa+2.05Fr)*fs
M'=M*fs
And then find the curves more than 2:00, which can point in the curve below.
• Single-row Cross Roller
Fa'=(Fa+2.05Fr)*fs
M'=M*fs
Fa'=Fa*fs
M'=M*fs
Double-row Ball Reducer
Reducing the double-row ball slewing bearing selection calculation, but Fr ≦ 10% Fa pm, Fr negligible. When Fr ≧ 10% Fa, consideration must be given the inside track of the changes in pressure angle, and its calculation please contact us.
Fa'=Fa*fs
M'=M*fs
Fa'=Fa*fs
M'=M*fs
• three-row roller-type
Three-row roller slewing ring selection, the only Rolling Road axial load and overturning moment calculation role.
Fa'=Fa*fs
M'=M*fs
Dynamic Selection
For continuous operation, high-speed rotation of the slewing bearing and other specific requirements of the life of the applications, please contact with me.
Checking bearing capacity of bolts:
• the slewing ring bearing the greatest load (not by the static safety factor fs) as a choice of bolt load.
• check whether the load level required to bolt the following limit load curve;
• If the bearing capacity of bolts is not enough to re-select slewing ring, or with my company.
• Selection of calculating the distance - door crane sitting (grab)
Table1
Note: fl is the dynamic factor of safety, he must combine the use of dynamic load curve (dynamic load curve does not contain sub-samples) it comes from experience and experiment. Maximum working load is based on the circumstances of a reference value. Selection of the use of carrying capacity curve, the maximum recommended load is calculated as follows:
Cranes take the door (grab): fs = 1.45
Maximum static load is known in the biggest, the load calculation formula is as follows:
• 8 of the maximum working load of wind
Axial force Fa = Q + A + O + G
Overturning moment: M = Q * lmax + A * amax + W * r-O * o-G * g
2) Excluding the wind, taking 25% of the load test load
Axial force: Fa = 1.25Q + A + O + G
Overturning strength: M = 1.25Q * lmax + A * amax-O * o-G * g
For example: a bucket of known port crane at the time of the most substantial work load and the amplitude as follows:
Q=260KN lmax=23m
A=75KN amax=11m
O=450KN o=0.75m
G=900KN g=3m
W=27KN r=6.5m
• 8 at the time of maximum working wind load:
Fa=Q+A+O+G=260+75+450+900=1685KN
M=Q*lmax+A*amax+W*r-O*o-G*g=260*23+75*11+27*6.5-450*0.75-900*3=3943KNm
2) Excluding the wind, taking 25% of the pilot work load of the largest load
Fa=1.25Q+A+O+G=325+75+450+900=1750KN
M=1.25Q*lmax+A*amax-O*o-G*g=325*23+75*11-45*0.75-900*3=5566.3KNm
• Excluding the maximum working load when the wind
Fa=1685KN
M=Q*lmax+A*amax-O*o-G*g=260*23+75*11-450*0.75-900*3=3767.5KNm
2selected in line with the work as a static load calculation.
Slewing bearing static load for reference:
Fa'=1750KN*1.45=2537.5KN
M'=5566.3KNm*1.45=8071.1KNm
And bolt load calculations as follows:
Fa=1750KN
M=5566.3KNM
According to the above results, in the carrying capacity curve, the choice to determine the choice of slewing ring 13 *. 45.2000.002.
l line for the static load-bearing capacity curve
8.8, 10.9 for the bolt load curve
1'-static load point
2'-bolt load point
1 'Point Road and then rolled under a static load curve, so to meet the requirements of
2 '10.9 points in the load curve of the bottom bolts, bolts have therefore chosen to meet the requirements of 0.9.
