MAGNETIC FLUX LEAKAGE PIG

WIPO Patent Application WO/2019/132219

A1

A magnetic flux leakage PIG according to one embodiment of the present invention comprises: a body formed to move in the gas flow direction inside a pipe; and multiple magnetizing modules coupled to the outer peripheral surface of the body along the circumferential direction thereof. Each of the magnetizing modules comprises: a support coupled to the body; a module body configured to come in contact with the inner peripheral surface of the pipe; a pair of levers which are axially coupled to the module body at one end of each thereof and to opposite ends of the support at the other end of each thereof such that the magnetizing module contracts or expands depending on a change in the diameter of the pipe, and which can be rotated by the bidirectional rotation of each axis-coupling portion; and a suspension portion comprising: an elastic support body having one surface fixed on the support and elastically supporting the levers; and a pair of first rollers coupled to opposite ends of the elastic body and in contact with the levers, respectively.

WO/1996/030692	INTERNAL PIPE MANIPULATOR
WO/2005/054738	HYDRAULIC CYLINDERS AND PLUG WITH HYDRAULIC CYLINDER
WO/1997/006966	WHEELED CARRIAGE WITH ADJUSTABLE AXLES TO VARY WHEEL SPACING

YOO HUI RYOUNG (KR)
CHO SUNG HO (KR)
KIM DONG KYU (KR)
KIM SANG HYUK (KR)
KIM DAE KWANG (KR)
KIM JAE JUN (KR)
YANG SEUNG UNG (KR)

PCT/KR2018/013161

July 04, 2019

November 01, 2018

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KOREA GAS CORP (KR)

F16L55/28; H01F7/02; H01F13/00; F16L101/30

CN101819181A	2010-09-01
CN204629109U	2015-09-09
KR101649319B1	2016-08-19
KR200479032Y1	2015-12-10
KR101491416B1	2015-02-06

LEE & PARK (KR)

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