Method and device for measuring residual elongation of top cover bolt of pumped storage unit
A technology for residual elongation and measuring devices, applied in measuring devices, electrical devices, instruments, etc., can solve problems such as cumbersome process, time-consuming, laborious, and inconvenient
Active Publication Date: 2020-06-30
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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[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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The invention provides a method and device for measuring residual elongation of a top cover bolt of a pumped storage unit, and the device comprises two eddy current displacement sensors which are respectively used for measuring a first stretching distance and a second stretching distance of each hollow top cover bolt in an operation process of a hydraulic stretcher; a pressure sensor which is usedfor measuring the hydraulic value of the hydraulic stretcher in the operation process; a data acquisition and processing unit which is used for calculating the first residual elongation and the second residual elongation of each hollow top cover bolt according to each first stretching distance and each second stretching distance, and determining a corresponding target hydraulic value when the first residual elongation reaches an approximate rated elongation value, determining an initial hydraulic value for operating the solid top cover bolt according to the target hydraulic value, and determining a correction coefficient for correcting a residual elongation measured value of the solid top cover bolt according to the two residual elongations and the target hydraulic value. According to theembodiment, the residual elongation of the top cover bolt can be accurately measured, so that the purpose of accurately controlling the pre-tightening force of the top cover bolt is achieved.
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...
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IPC IPC(8): G01B21/02G01B7/02
CPCG01B21/02G01B7/02
Inventor 唐拥军江献玉赵强葛玉林郭旭东李永红
Owner STATE GRID CORP OF CHINA
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