Is Kunming South Asia Flower Expo Center worth visiting
Publish: 2021-05-26 05:06:04
1. Fake, just cheated 6380 yuan, under the banner of 360, in fact, it's not under the flag of 360. Step by step, I ask you to charge money. What kind of deposit, unfreezing money
2. If the shaft is placed horizontally, the static radial load is half of the force (external force + gravity) on the supporting shaft (a pair of bearings). If the shaft is placed vertically, it is more complicated. The static radial load and dynamic radial load are related to the contact angle between the rolling element and the raceway. If the external force is large, the gravity of the shaft can be ignored, and only the external force is considered.
3. The basic dynamic rated load of 6214 ball bearing is 63700n, then the number of working cycles L = (63700 / 5000) ^ 3 = 2068 (1e6), then the time is L / 60N = 35529 (HR), the theory is like this
4. Unknown_Error
5. The basic rated dynamic load CR of 6208 is 29100n, and the load of bearing is only radial load. Therefore, when [equivalent dynamic load p = radial load fr = 5200n] and [rotation speed n = 750rpm], the speed coefficient of ball bearing FN = [10 ^ 6 / (500 * 60N)] ^ 1 / 3 = (0.03n) ^ - 1 / 3 = 0.35422, FH = FN (CR / P) = 1.98.
LH = (10 ^ 6 / 60N) (C / P) ^ 3 = 500fh ^ 3 = 500 * 1.98 ^ 3 = 3881.196 hours
it is about 3800 hours
this is theoretical, but it may not be so much in practice
in addition, it is calculated according to the formula of NSK.
LH = (10 ^ 6 / 60N) (C / P) ^ 3 = 500fh ^ 3 = 500 * 1.98 ^ 3 = 3881.196 hours
it is about 3800 hours
this is theoretical, but it may not be so much in practice
in addition, it is calculated according to the formula of NSK.
6. 1、 Basic rated life and basic rated dynamic load
1. Basic rated life L10
bearing life: the total number of revolutions or working hours at a certain speed before fatigue pitting of any element in a single rolling bearing is called bearing life. Because the material, machining accuracy, heat treatment and assembly quality can not be the same, the same batch of bearings in the same working conditions, the life of each bearing has great discreteness, so the method of mathematical statistics is used to deal with
Basic rated life L10 - the total number of revolutions (in 106 units) or working hours at a certain speed of 90% of the bearings in the same batch of bearings under the same working conditions before fatigue pitting The failure probability is 10%
2. The basic rated dynamic load C
when the basic rated life of the bearing is L10 = 1 (106 revolutions), the load that the bearing can bear is called the basic rated dynamic load C. Under the action of the basic rated dynamic load, the reliability that the bearing can rotate 106 degrees without pitting failure is 90%< (1) C of radial bearing is pure radial load
(2) C of thrust bearing is pure axial load
(3) C of angular contact ball bearing and tapered roller bearing refers to the radial component of load when relative radial displacement occurs between rings.
1. Basic rated life L10
bearing life: the total number of revolutions or working hours at a certain speed before fatigue pitting of any element in a single rolling bearing is called bearing life. Because the material, machining accuracy, heat treatment and assembly quality can not be the same, the same batch of bearings in the same working conditions, the life of each bearing has great discreteness, so the method of mathematical statistics is used to deal with
Basic rated life L10 - the total number of revolutions (in 106 units) or working hours at a certain speed of 90% of the bearings in the same batch of bearings under the same working conditions before fatigue pitting The failure probability is 10%
2. The basic rated dynamic load C
when the basic rated life of the bearing is L10 = 1 (106 revolutions), the load that the bearing can bear is called the basic rated dynamic load C. Under the action of the basic rated dynamic load, the reliability that the bearing can rotate 106 degrees without pitting failure is 90%< (1) C of radial bearing is pure radial load
(2) C of thrust bearing is pure axial load
(3) C of angular contact ball bearing and tapered roller bearing refers to the radial component of load when relative radial displacement occurs between rings.
7. There is a problem with this problem, and it does not say the direction of the load on the gear. If it is a radial load, the bearing load of the shaft is 1500N, and the equivalent dynamic load is 1500N. The rest of the formula is OK.
8. The st can be completely removed without disassembly. With a high-power blower, the st can be completely removed after blowing for a few minutes. I don't recommend disassembly
9.
The motor of the electric fan is the power source for the rotation of the fan blade, which is located in the middle of the electric fan. The specific operation steps for dismantling the electric fan motor are as follows:
1. Loosen the fixing screws of the upper and lower shell of the electric fan
10.
1. Fan is generally used to fasten the button, is also a site without screw design, so it is more convenient to remove. This one doesn't need a screwdriver. It can be disassembled directly. There is also a screw, which needs to be removed with a screwdriver
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