Annular array energy transducer for pipeline axial residual stress detection based on critically refracted longitudinal wave method

A technology of critical refraction and residual stress, applied in the direction of instruments, measuring force, measuring devices, etc., can solve the problems of high-efficiency detection of large circular pipelines

Inactive Publication Date: 2012-03-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using several pairs of transducers (according to different pipe radii) in one send and one receive mode, the problem of high-efficiency detection of stress in large circular pipes is solved

Method used

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  • Annular array energy transducer for pipeline axial residual stress detection based on critically refracted longitudinal wave method
  • Annular array energy transducer for pipeline axial residual stress detection based on critically refracted longitudinal wave method
  • Annular array energy transducer for pipeline axial residual stress detection based on critically refracted longitudinal wave method

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Embodiment Construction

[0016] The specific embodiment of the present invention is described in detail below:

[0017] Such as Figure 4 The annular array transducer shown mainly includes several parts such as a fixed soft cover, a piezoelectric transducer, a plexiglass wedge, a transmission line, and a screw. A fixed soft sleeve is used, and the inner ring of the soft sleeve has several stepped grooves. Several plexiglass wedges that have been assembled with transducers according to the first critical angle are assembled into the stepped grooves of the soft sleeve through screws. Then wrap the entire soft sleeve around the annular pipe, and buckle the fixed soft sleeve on the outer wall of the pipe with a locking buckle, so that several pairs of transducers can correspond one by one along the circumference, and each plexiglass wedge can be well contact with the outer wall of the pipe.

[0018] Such as figure 2 As shown in the three-dimensional drawing of the fixed soft cover, one end of the fixe...

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Abstract

The invention relates to an annular array energy transducer for pipeline axial residual stress detection based on a critically refracted longitudinal wave method. A critically refracted longitudinal wave method is utilized to realize axial residual stress detection of a circumferential array of an annular pipeline; and a plurality of organic glass wedges are uniformly assembled and distributed at an inner ring of a fixed flexible sleeve. When the annular array energy transducer works, the fixed flexible sleeve is wound the circumference of the annular pipeline and is fastened; and a certain pretightening force is added according to the radius of the pipeline. Besides, a plurality of pairs of piezoelectric transducers are assembled in each of the organic glass wedge, so that an axial mode of one sending and one receiving is formed, wherein the mode has a property of equipartition with 360 degrees; and moreover, a first critical angle is formed between each of the energy transducer and a contact tangent plane of each of the organic glass wedge. According to the invention, on-line detection on annular pipelines with different radiuses is realized; and the annular array energy transducer has characteristics of high sensitivity and convenience for using and the like; besides, the annular array energy transducer is especially suitable for detection on some large petroleum transmission pipelines.

Description

1. Technical field [0001] The invention relates to an annular array transducer for detecting axial residual stress of pipelines based on critical refraction longitudinal wave method. This device can realize the online detection of circular pipelines, and has the characteristics of high sensitivity, high efficiency and convenient use, etc., and is especially suitable for the detection of some large oil pipelines. 2. Background technology [0002] With the development of the world's petroleum industry, the transportation volume of pipelines is increasing, and the transmission pressure is also increasing, so the requirements for the strength of oil pipelines are also correspondingly increased. The spiral weld is the weak part of the oil pipeline. Due to the constraints in the welding process, the shrinkage effect of local heating and cooling, and the change factors of the metal structure, the oil pipeline will inevitably produce residual stress. After the oil pipeline is put i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25
Inventor 徐春广郭军潘勤学肖定国杨向臣徐浪李骁宋文涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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