Method and equipment for evaluating technological property of bolt installation

Abstract

The invention relates to a method and equipment for evaluating the technological property of bolt installation, and the method comprises the steps: determining the fastening sequence of bolts; testing the total pulling force of bolts in an operation process under the condition of different loads; obtaining a real-time stress amplitude value; making a conclusion that an end face of a connected part is cracked when the real-time stress amplitude value is greater than a standard stress amplitude value; and determining the fastening sequence of new bolts till the fastening sequence of the current bolt is judged to be the optimal bolt fastening sequence. The equipment comprises a signal input end module, a signal collection and processing module, and a man-machine interaction module, wherein the signal input end module comprises a strain signal input end, a standard analog input end, and a power circuit. The signal collection and processing module comprises a processing chip. The man-machine interaction module comprises a processor, a communication interface, an operation module, and a display module. The method and equipment can test the bolts, propose a new installation technology, and facilitate the maintenance of the bolts.

Description

technical field [0001] The invention relates to the field of bolt maintenance and detection, in particular to a performance evaluation method and equipment for bolt installation process suitable for wind turbine pitch bearings and yaw bearings. Background technique [0002] According to the statistical data of the quality system of a wind turbine manufacturer, the bolt failure rate of wind turbines has been on the rise in recent years. Broken bolts will cause problems such as blade falling off and wind turbine tower collapse. In addition, bolt breakage will also cause damage to the internal and nearby components of the wind turbine, resulting in long-term shutdown of the wind turbine, and even the need to remove related large components. These problems will bring many adverse effects to the wind power market. At present, the bolts connecting the pitch bearing and the wheel hub are particularly broken, accounting for about 80% of the total number of broken bolts. For the 1....

AI Technical Summary

Problems solved by technology

The dissatisfaction of the owners due to the frequent breakage of bolts on some sites has seriously affected the after-sales payment of wind turbines

[0003] The bolts connecting the yaw bearing and the base of the wind turbine, the bolts connecting the pitch bearing and the hub, and the bolts connecting the pitch bearing and the blades are prone to breakage. At present, only on-site maintenance personnel can replace the bolts according to requirements after they find that the bolts are broken , this approach has certain drawbacks and limitations:

[0004] 1. At present, after the bolt breakage occurs, it is only a simple replacement. Generally, the broken bolt and its adjacent 5 bolts will be replaced according to the process manual. When the number of broken bolts is large, the bolts on the entire flange connection surface will be replaced. Not only The consumption of spare parts is large, and the workload is also large. Sometimes in order to remove the broken wire, it is necessary to purchase special tools and take longer;

[0005] 2. In some project sites, there is still the problem that the bolts are more and more broken. After the bolts are replaced, the new bolts will break again every other year or even less than half a year;

[0006] 3. In some sites, after the bolt strength level and construction torque are increased, the bolt fracture failure still occurs, and even the bolt hole is damaged.

[0008] It can be seen that the above-mentioned existing wind turbine bolt replacement and maintenance method and use obviously have inconvenience and defects, and need to be further improved urgently.

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