Bearing common sense: difference between pitch bearing and yaw bearing
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Bearing common sense: difference between pitch bearing and yaw bearing
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1) Bearing inner and outer ring semi-product preparation In order to ensure the yaw bearing has a high appearance quality; the anti-corrosion spraying process is organized after all machining; the sprayed bearing parts are directly stored in the warehouse after completion; ensure that the anti-corrosion layer will not be Bruise.
2) Pre-sanitary organic solvent for degreasing treatment; bearing semi-products may have oil stain on the surface after machining; in order to ensure the quality of spraying, it is necessary to organize the hygienic process before spraying.
3) Pre-protection of the workpiece Before the blasting and spraying, the special surface pre-welding tool is used to complete the circular arcing of the workpiece, the threaded hole and the appearance without spraying.
4) Sand blasting roughens the outer and outer rings of the bearing; adds the contact surface between the coating and the workpiece; makes the surface of the workpiece more activated; improves the contact strength of the coating. 5) Arc spray arc spraying (pure aluminum or zinc) equipment Firstly, it includes DC power supply, spray gun, air compressor and air filter; it mainly controls the arc voltage, current, wire feed speed, compressed air pressure, spray interval and other parameters.
6) Closing the treatment because there is pores in the coating after spraying; therefore it is necessary to close the treatment; add anti-corrosion.
After the spraying and the device, the yaw bearing has the appearance of gear appearance, the appearance of the thread of the device and the arc-shaped raceway surface. The first two are coated with anti-rust oil after the device; the latter is coated with lubricating grease when the device is installed; The inner packaging of the product is closed with a plastic film; the outer layer is covered with a plastic braid to protect the rust;
2 Damping torque 2.1 The structure of the pitch bearing and the yaw bearing is different. The damper torque has two origins: one is the conflict resistance of the raceway; the other is the conflict resistance between the seal and the sealing surface. In the meantime, the latter is usually constant under the same processing conditions; therefore, the huge rule of damping torque after yaw bearing device depends on the former.
Some conflicting resistance moments that occur when the raceway is reversed depend on the size of the bearing gap. The gap is large. The resistance is 湎 ≡蜃枇 嘤υ龃 嘤υ龃. The yaw bearing requires zero or negative gap; The collision damping torque behind the device is determined. Therefore, the size of the collision damping torque after the device basically depends on the device clearance value of the yaw bearing; and the composition of this value depends firstly on the precision of the raceway before the raceway is quenched. There are four links in the quenching of the road surface, the grinding scale after the quenching of the raceway and the scale of the rolling body.
Wind power bearings (yaw bearings, pitch bearings) are subject to complex forces; and the bearings receive relatively large shocks and oscillations; thus; demand bearings can accept both impact and large loads. Wind turbine main engine life requirements 20 years; the cost of the bearing device is relatively large; therefore, the demand for yaw and pitch bearing life must reach 20 years.
Wind turbines can operate in extremely cold areas; ambient temperatures are as low as -400c; bearing operating temperatures are around -200C; bearings are subject to high shock loads at low temperatures.
The yaw and pitch bearings have special requirements in terms of clearance. Compared with the yaw bearing, the impact load of the pitch bearing is relatively large; the blast of the wind blows to the blade is also large; therefore, the clearance of the required pitch bearing should be zero. The clearance may have a slight negative clearance value; this can reduce the fretting wear of the bearing in the case of sensation. The yaw bearing demand is a small clearance value.
Wind turbine equipment is operated in the field; and some of the yaw and pitch bearings are exposed to the outside; they are exposed to atmospheric pollution; the high humidity environment also corrodes the bearing matrix; thus; the yaw and deformation exposed to the outside The position of the paddle bearing needs to be treated for external corrosion protection.
The difference between pitch bearings and yaw bearings; the above is here; trust us have a certain understanding of pitch bearings and yaw bearings.
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