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Method and device for measuring residual elongation of top cover bolts of pumped storage units

A technology of residual elongation and top cover, which is applied in the field of measurement of residual elongation of top cover bolts of pumped storage units, and can solve problems such as time-consuming, laborious, inconvenient, and processing reflective surfaces

Active Publication Date: 2022-01-25
STATE GRID CORP OF CHINA +3
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Problems solved by technology

However, in order to realize the ultrasonic measurement of residual elongation, on the one hand, reflective surfaces must be provided at both ends of the measured bolt, but the actual top cover bolts are not convenient to process the reflective surface at the end of the bolt; secondly, bolt samples need to be prepared in advance , and calibrate the relationship curve between the ultrasonic pulse time and the tensile length of the bolt sample in the laboratory, which is time-consuming and laborious, and the process is cumbersome; will affect the measurement accuracy

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  • Method and device for measuring residual elongation of top cover bolts of pumped storage units
  • Method and device for measuring residual elongation of top cover bolts of pumped storage units
  • Method and device for measuring residual elongation of top cover bolts of pumped storage units

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[0047] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present specification shall have ordinary meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in one or more embodiments of the present specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "con...

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Abstract

This manual provides a method and device for measuring the residual elongation of the top cover bolts of a pumped storage unit, including: two eddy current displacement sensors, which are used to measure each hollow top cover bolt during the operation of the hydraulic tensioner The first and second stretching distances; the pressure sensor is used to measure the hydraulic pressure value of the hydraulic stretcher during operation; the data acquisition and processing unit is used to calculate each stretching distance according to the first and second stretching distances The first and second residual elongation of the hollow roof bolt, when the first residual elongation reaches the approximate rated elongation value, determine the corresponding target hydraulic value; according to the target hydraulic value, determine the bolt used to operate the solid roof The initial hydraulic value of , according to the two residual elongation and the target hydraulic value, determine the correction coefficient used to correct the measured value of the residual elongation of the solid roof bolt. This embodiment can accurately measure the residual elongation of the top cover bolts, thereby achieving the purpose of accurately controlling the pretightening force of the top cover bolts.

Description

technical field [0001] One or more embodiments of this specification relate to the technical field of hydropower engineering, and in particular to a method and device for measuring the residual elongation of top cover bolts of a pumped storage unit. Background technique [0002] The top cover bolt is a key component in the pumped storage unit, which is used to combine the top cover and the seat ring together. When the pumped storage unit is running, the top cover bears a large dynamic load of hydraulic pressure, especially during the transition process, the top cover is impacted by the water hammer pressure wave, if the top cover bolts are not fastened, there is fatigue damage or the bolt strength is not , After long-term operation, bolts may break and the top cover may be lifted, resulting in serious accidents such as unit damage or even flooding of the plant, resulting in huge loss of life and property. Therefore, qualified roof bolts must be used, and the pretightening f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/02G01B7/02
CPCG01B21/02G01B7/02
Inventor 唐拥军江献玉赵强葛禹霖郭旭东李永红
Owner STATE GRID CORP OF CHINA
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