Pipeline resonance fatigue test bench

Abstract

The present invention discloses a pipeline resonance fatigue test bench. The pipeline resonance fatigue test bench comprises: a fixing plate; at least two supporting mechanisms movably arranged on thefixing plate; a displacement measuring device; a first cover plate, one side of which is fixedly connected with the pipeline to be tested; a bearing pedestal, one side of which is rotatably supportedon the other side of the first cover plate; a screw shaft which passes through the centers of both sides of the bearing pedestal along the axial direction of the pipeline to be tested, is rotatably connected with the bearing pedestal and is provided with an external thread on the outer surface; a guide shaft arranged parallel to the screw shaft; an eccentric block with an internal thread passingthrough the guide shaft and appropriately sleeved on the external thread; and a driving motor, a power output end of which is connected with the other side of the bearing pedestal. Through the centrifugal vibration of the eccentric block, the vibration frequency is close to the frequency of the welded part of the pipeline and resonance is generated, then an overall fatigue performance test for circumferential weld of the pipeline and pipe fitting is realized.

Description

technical field [0001] The invention relates to a pipeline resonance fatigue test bench, which belongs to the field of testing machines. Background technique [0002] With the vigorous development of offshore oil and gas resources, the construction of submarine pipelines, as a key connecting component of oil and gas transportation, is increasing year by year. At the same time, due to the special service environment of marine pipelines, and with the advancement to deep waters, the environment of marine pipelines tends to be more severe, and the accidents and pollution caused by the rupture of submarine oil and gas pipelines are on the rise both at home and abroad. [0003] In view of the particularity of oil and gas transportation, the safety and airtightness of submarine oil and gas pipelines, that is, their mechanical properties, welding performance, fatigue life, etc., are particularly important. Therefore, accurate testing of various performance parameters of pipelines ...

AI Technical Summary

Problems solved by technology

[0005] 1) Uneven upward stress on the weld ring

Theoretically speaking, the force at the three o'clock and nine o'clock positions is zero, so the final result has not yet reflected the overall performance of the component, and the result is also related to the clamping position of the pipe on the testing machine (small defects in the pipe or weld position at the time of the test)

[0006] 2) The test time is too long

The vibration frequency of the test piece is 1.5Hz. If one million times of tests are performed, it needs to work continuously for more than 185 hours (about 7.7 days), which will have a great impact on the test period and even the construction.

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