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On-line monitoring method and system for unit top cover bolts

A monitoring system and bolt technology, which is applied in the testing of mechanical components, testing of machine/structural components, force measurement, etc., can solve the problem of no foreign matter on the head of the bolt, difficulty in monitoring the stress of the bolts on the roof of the turbine unit, and the non-sticky surface of the bolts. Waiting for questions

Active Publication Date: 2021-05-04
DADU RIVER HYDROPOWER DEV +1
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  • Claims
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Problems solved by technology

[0005] The main purpose of this application is to provide a method and system for on-line monitoring of unit top cover bolts to solve the problem that in the related art, during the installation process of the unit top cover bolts, there must be no foreign matter on the bolt heads, so the surface of the bolts cannot be bonded to the sensor during installation, resulting in It is difficult to monitor the stress of the top cover bolts of the turbine unit

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  • On-line monitoring method and system for unit top cover bolts
  • On-line monitoring method and system for unit top cover bolts
  • On-line monitoring method and system for unit top cover bolts

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Embodiment Construction

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0023] It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances for...

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Abstract

The application discloses an online monitoring method and system for the roof bolts of the unit. The online monitoring method for the roof bolts of the unit includes: unifying the initial stress of the bolts to be measured after installation as a reference value; using an ultrasonic stress monitoring system for real-time monitoring The stress change value of the bolt to be measured; when the stress change value increases, the ratio of the stress change value to the reference reference value is calculated in real time, and when the ratio exceeds the set load threshold, an overload alarm is issued; when the stress When the change value decreases, the ratio between the stress change value and the reference reference value is calculated in real time, and when the ratio is lower than the set slack warning threshold, a slack alarm is issued. This application solves the problem in the related art that there must be no foreign objects on the head of the bolts during the installation of the top cover bolts of the unit, so the surface of the bolts cannot be bonded to the sensor during installation, which makes it difficult to monitor the stress of the top cover bolts of the hydraulic turbine unit.

Description

technical field [0001] The present application relates to the field of roof bolt monitoring, in particular to a method and system for on-line monitoring of unit roof bolts. Background technique [0002] Compared with the steam turbine, the working fluid density of the hydraulic turbine is higher, and the flow field is more complex. Therefore, the force of the runner chamber of the hydraulic turbine is extremely complicated. The top cover is an important part of the turbine. It is fixed on the upper end of the turbine unit by multiple bolts, mainly to fix the water guiding mechanism and bear the axial load. After long-term use, the bolts of the top cover may become loose or the pre-tightening force is too large, which may cause safety accidents, so the stress of the bolts needs to be monitored. [0003] In the related technology, the online stress monitoring of ordinary bolts, the test result is the absolute value of the load. Since the load distribution of the bolt section ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01L1/25G01N29/04
CPCG01L1/255G01M13/00G01N29/04G01N2291/02827G01N2291/2691
Inventor 涂扬举李林侯远航钱冰马越梅燕
Owner DADU RIVER HYDROPOWER DEV
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