CN113624110A - Method for detecting flatness of liquid cargo tank of LNG ship - Google Patents

Method for detecting flatness of liquid cargo tank of LNG ship Download PDF

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Publication number
CN113624110A
CN113624110A CN202110743186.XA CN202110743186A CN113624110A CN 113624110 A CN113624110 A CN 113624110A CN 202110743186 A CN202110743186 A CN 202110743186A CN 113624110 A CN113624110 A CN 113624110A
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CN
China
Prior art keywords
detecting
cargo tank
self
flatness
liquid cargo
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Pending
Application number
CN202110743186.XA
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Chinese (zh)
Inventor
刘传
黄华兵
胡家耀
黄清添
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hudong Zhonghua Shipbuilding Group Co Ltd
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Hudong Zhonghua Shipbuilding Group Co Ltd
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Publication date
Application filed by Hudong Zhonghua Shipbuilding Group Co Ltd filed Critical Hudong Zhonghua Shipbuilding Group Co Ltd
Priority to CN202110743186.XA priority Critical patent/CN113624110A/en
Publication of CN113624110A publication Critical patent/CN113624110A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/28Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
    • G01B5/285Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces for controlling eveness

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention discloses a method for detecting the flatness of a liquid cargo tank of an LNG ship, which is based on a self-made tool, and the self-made tool comprises the following steps: a straightedge having a predetermined span; a first spacer fixed at a length center of a first face of the straightedge; the two second gaskets are fixed at two ends of the second surface of the ruler; the method includes detecting a convex position and detecting a concave position; the detecting a position of the projection includes: holding the self-control tool to enable the middle part of the self-control tool to be aligned to the protruding position, enabling two second gaskets of the self-control tool to be tightly attached to the wall surface of the liquid cargo tank hull, enabling the first gaskets to face to the outer space, and if the deformation protruding position of the hull and the middle area of the straight scale keep a gap, judging that the flatness detection is qualified, otherwise, judging that the flatness detection is unqualified.

Description

Method for detecting flatness of liquid cargo tank of LNG ship
Technical Field
The invention belongs to the field of ship construction, and particularly relates to a method for detecting the flatness of a liquid cargo tank of an LNG ship.
Background
The flatness detection method is characterized in that a common 3-meter ruler is tightly attached to the wall surface of the liquid cargo tank, and a clearance between the 3-meter ruler and the wall surface of the liquid cargo tank is measured through a feeler gauge to judge whether the flatness is qualified.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for detecting the flatness of a liquid cargo tank of an LNG ship.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting the flatness of a liquid cargo tank of an LNG ship is based on a self-made tool, and the self-made tool comprises the following steps: a straightedge having a predetermined span; a first spacer fixed at a length center of a first face of the straightedge; the two second gaskets are fixed at two ends of the second surface of the ruler; the method includes detecting a convex position and detecting a concave position; the detecting a position of the projection includes: holding the self-made tool to enable the middle part of the self-made tool to be aligned to the protruding position, enabling two second gaskets of the self-made tool to be tightly attached to the wall surface of the liquid cargo tank hull, enabling the first gaskets to face to the external space, if the deformed protruding position of the hull and the middle area of the straight scale keep a gap, judging that the flatness detection is qualified, and otherwise, judging that the flatness detection is unqualified; the detecting a recessed position includes: holding the self-control tool to enable the middle part of the self-control tool to be aligned to the sunken position, enabling two second gaskets of the self-control tool to be tightly attached to the wall surface of the liquid cargo tank hull, enabling the first gasket to face the sunken position, and judging that the flatness detection is unqualified if the deformed sunken position of the hull and the first gasket keep a gap, otherwise, judging that the flatness detection is qualified.
Preferably, the method includes, in detecting the convex position and detecting the concave position: the self-made tool is pushed to tightly adhere to and slide on the wall surface of the liquid cargo tank, so that continuous detection is realized.
Preferably, the gasket is connected with the ruler through screws, and a counter bore for accommodating the screw head is arranged on the gasket.
Preferably, the thickness of the spacer is 3-13mm and the span of the straightedge is 2-6 m.
Preferably, the spacer thickness is 7mm and the span of the straightedge is 3 m.
Preferably, the material of the straightedge is an aluminum alloy.
Preferably, the materials of the first gasket and the second gasket are ZGMn 13.
Compared with the prior art, the invention has the beneficial effects that: the detection of the wall surface of the liquid cargo tank can be continuously carried out, the detection result is visual, the detection efficiency is effectively improved, and the working time of detecting the flatness of a single tank is reduced by 32 hours/person.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a detection failure of a recess according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a detection pass of a recess according to an embodiment of the invention.
FIG. 3 is a schematic diagram of a bump passing detection according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of the protrusion failing to be detected according to the embodiment of the invention.
1-a ruler; 2-a first gasket; 3-a second gasket; 4-screws; 5-liquid cargo tank to be tested for flatness; 6-the state that the first gasket at the concave part can be attached to the liquid cargo tank; 7-the liquid cargo tank at the bulge can not be attached to the ruler; the liquid cargo tank at the 8-convex part can be attached to the straight edge.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Examples
As shown in fig. 1-4, three specially-made 7mm detection gaskets are respectively installed at the two ends of one side and the center of the other side of the aluminum alloy ruler by screws.
When the position of the bulge is detected, the gaskets arranged at the two ends are tightly attached to the wall surface of the liquid cargo tank, whether the middle area of the straight ruler is in contact with the ship body or not is observed, if the gasket is not in contact with the ship body, the bulge is smaller than 7mm/3m, and the flatness detection is qualified. And slowly sliding the special measuring scale on the premise of ensuring that the measuring gaskets at the two ends are tightly attached to the wall surface of the liquid cargo tank, continuously measuring, keeping observation during the continuous measuring, confirming that the liquid cargo tank wall does not touch the middle area of the scale body in the moving process, and determining that the passing area is a convex measuring qualified area.
When the sunken position is detected, the gasket arranged in the center is arranged at the sunken position, the two ends of the special detection ruler are attached to the ship body as tightly as possible, and if the central gasket cannot contact the wall surface of the liquid cargo tank, the ship is unqualified. Otherwise, the product is qualified. And slowly sliding the special measuring scale on the premise of ensuring that the central measuring gasket is tightly attached to the wall surface of the liquid cargo tank, continuously measuring, keeping observation during the continuous measuring, confirming that the liquid cargo tank wall does not leave the central gasket in the moving process, and determining that the passing area is a sunken measuring qualified area.
And if the same region passes through the convex detection and the concave detection in sequence, the flatness detection of the liquid cargo tank in the region is qualified.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.

Claims (7)

1. The method for detecting the flatness of the liquid cargo tank of the LNG ship is characterized by being based on a self-made tool, and the self-made tool comprises the following steps:
a straightedge having a predetermined span;
a first spacer fixed at a length center of a first face of the straightedge;
the two second gaskets are fixed at two ends of the second surface of the ruler;
the method includes detecting a convex position and detecting a concave position;
the detecting a position of the projection includes: holding the self-made tool to enable the middle part of the self-made tool to be aligned to the protruding position, enabling two second gaskets of the self-made tool to be tightly attached to the wall surface of the liquid cargo tank hull, enabling the first gaskets to face to the external space, if the deformed protruding position of the hull and the middle area of the straight scale keep a gap, judging that the flatness detection is qualified, and otherwise, judging that the flatness detection is unqualified;
the detecting a recessed position includes: holding the self-control tool to enable the middle part of the self-control tool to be aligned to the sunken position, enabling two second gaskets of the self-control tool to be tightly attached to the wall surface of the liquid cargo tank hull, enabling the first gasket to face the sunken position, and judging that the flatness detection is unqualified if the deformed sunken position of the hull and the first gasket keep a gap, otherwise, judging that the flatness detection is qualified.
2. The method for detecting the flatness of a cargo tank of an LNG carrier according to claim 1, wherein the method comprises, when detecting the position of the protrusion and detecting the position of the depression: the self-made tool is pushed to tightly adhere to and slide on the wall surface of the liquid cargo tank, so that continuous detection is realized.
3. The method for detecting the flatness of the cargo tank of an LNG carrier according to claim 2, wherein the washer is connected with the straight edge through a screw, and a counter bore for accommodating the screw head is formed in the washer.
4. The method for detecting the flatness of a cargo tank of an LNG carrier according to claim 3, wherein the thickness of the pad is 3 to 13mm, and the span of the straight edge is 2 to 6 m.
5. The method for detecting the flatness of a cargo tank of an LNG carrier according to claim 4, wherein the thickness of the pad is 7mm, and the span of the straight edge is 3 m.
6. The method for detecting the flatness of the cargo tank of the LNG carrier as recited in claim 5, wherein the material of the straight scale is aluminum alloy.
7. The method for detecting the flatness of the cargo tank of the LNG carrier as claimed in claim 6, wherein the first gasket and the second gasket are both ZGMn 13.
CN202110743186.XA 2021-06-30 2021-06-30 Method for detecting flatness of liquid cargo tank of LNG ship Pending CN113624110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110743186.XA CN113624110A (en) 2021-06-30 2021-06-30 Method for detecting flatness of liquid cargo tank of LNG ship

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110743186.XA CN113624110A (en) 2021-06-30 2021-06-30 Method for detecting flatness of liquid cargo tank of LNG ship

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CN113624110A true CN113624110A (en) 2021-11-09

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102393173A (en) * 2011-08-18 2012-03-28 奇瑞汽车股份有限公司 Clearance and flatness measuring tool
CN202814324U (en) * 2012-06-06 2013-03-20 沪东中华造船(集团)有限公司 Inspection ruler used for measuring evenness of ship type cargo hold inner housing
KR20130034983A (en) * 2011-09-29 2013-04-08 현대제철 주식회사 Device for measuring flatness of steel plate
CN105806186A (en) * 2014-12-31 2016-07-27 宁波江丰电子材料股份有限公司 Target material detection platform, target material detection device and target material detection method
CN107907038A (en) * 2017-12-19 2018-04-13 沪东中华造船(集团)有限公司 A kind of LNG ship cargo tank flatness inspection device and the method for inspection
US20200200527A1 (en) * 2018-11-22 2020-06-25 Wuhan China Star Optoelectronics Technology Co., Ltd. Surface flatness measuring device and surface flatness measuring method
CN212340155U (en) * 2020-06-13 2021-01-12 佛山市华洋仪器有限公司 Ceramic tile flatness, curvature and warping degree tester
CN112212771A (en) * 2020-09-24 2021-01-12 吴高雄 Three-dimensional building wall body outer vertical surface flatness detection device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102393173A (en) * 2011-08-18 2012-03-28 奇瑞汽车股份有限公司 Clearance and flatness measuring tool
KR20130034983A (en) * 2011-09-29 2013-04-08 현대제철 주식회사 Device for measuring flatness of steel plate
CN202814324U (en) * 2012-06-06 2013-03-20 沪东中华造船(集团)有限公司 Inspection ruler used for measuring evenness of ship type cargo hold inner housing
CN105806186A (en) * 2014-12-31 2016-07-27 宁波江丰电子材料股份有限公司 Target material detection platform, target material detection device and target material detection method
CN107907038A (en) * 2017-12-19 2018-04-13 沪东中华造船(集团)有限公司 A kind of LNG ship cargo tank flatness inspection device and the method for inspection
US20200200527A1 (en) * 2018-11-22 2020-06-25 Wuhan China Star Optoelectronics Technology Co., Ltd. Surface flatness measuring device and surface flatness measuring method
CN212340155U (en) * 2020-06-13 2021-01-12 佛山市华洋仪器有限公司 Ceramic tile flatness, curvature and warping degree tester
CN112212771A (en) * 2020-09-24 2021-01-12 吴高雄 Three-dimensional building wall body outer vertical surface flatness detection device

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