CN106324086B - Double-layer coaxial screw hole detection method - Google Patents

Double-layer coaxial screw hole detection method Download PDF

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Publication number
CN106324086B
CN106324086B CN201610858572.2A CN201610858572A CN106324086B CN 106324086 B CN106324086 B CN 106324086B CN 201610858572 A CN201610858572 A CN 201610858572A CN 106324086 B CN106324086 B CN 106324086B
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screw hole
rod
eddy current
layer screw
bottom end
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CN106324086A (en
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穆根生
林俊明
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Eddysun Xiamen Electronic Co Ltd
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Eddysun Xiamen Electronic Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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Abstract

The invention discloses a double-layer coaxial screw hole detection device and a method, wherein the device comprises an upper rod, a middle rod, a lower rod and a plurality of eddy current detection probes, the probes with unique structures are respectively inserted into an upper layer screw hole and a lower layer screw hole to be rotationally scanned, and the eddy current scanning of the double-layer screw hole can be completed through twice rotational scanning, so that the problem of screw hole defect detection of a double-layer screw hole workpiece is effectively solved, and the detection efficiency is greatly improved.

Description

Double-layer coaxial screw hole detection method
Technical Field
The invention relates to a nondestructive testing device and a nondestructive testing method, in particular to a double-layer coaxial screw hole testing device and a double-layer coaxial screw hole testing method.
Background
The fastening structure of some large-scale aircraft blades adopts a double-layer screw hole structure, and the nondestructive testing of screw hole defects is required to be regularly carried out for ensuring the operation safety of the blades. At present, an eddy current detection method is generally adopted to detect the defects of the hole edge and the inner wall of the screw hole, but due to the double-layer screw hole structure, the scanning difficulty of an eddy current detection probe is higher, and the detection efficiency is extremely low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-layer coaxial screw hole detection device and a double-layer coaxial screw hole detection method.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a double-deck coaxial screw detection device, includes upper boom, king-rod, lower beam, a plurality of eddy current test probe, its characterized in that: the upper rod is a cylinder, and the outer diameter of the upper rod is larger than the diameter of the screw hole to be detected; the middle rod is a cylinder, the outer diameter of the middle rod is equal to the diameter of the screw hole to be detected, and the upper end face of the middle rod is fixed in the center of the bottom end face of the upper rod; the part of the bottom end surface of the upper rod, which surrounds the upper end surface of the middle rod, is fixedly provided with an eddy current detection probe, and a row of eddy current detection probe groups are radially fixed on the lateral peripheral surface of the middle rod and are formed by arranging a plurality of eddy current detection probes; the lower rod is an elastic rod, the upper end face of the lower rod is fixed on the bottom end face of the middle rod, the lower rod inclines outwards by taking the central axis of the middle rod as a center, the length of the lower rod in the direction perpendicular to the bottom end face of the middle rod is equal to the distance between the double-layer screw holes, and the rotating inner diameter of the bottom end face of the lower rod by taking the central axis of the middle rod as a center is equal to the diameter of the screw holes; an eddy current testing probe is fixed on the bottom end face of the lower rod.
The double-layer coaxial screw hole detection method is characterized in that the device is adopted: the device is respectively inserted into the upper layer screw hole and the lower layer screw hole for rotary scanning, and the eddy current scanning of the double-layer screw hole can be completed through two times of rotary scanning, which comprises the following steps,
a. the device is inserted into the upper-layer screw hole from top to bottom, and the part of the bottom end surface of the upper rod in the device, which surrounds the upper end surface of the middle rod, is just attached to the upper periphery of the hole of the upper-layer screw hole; the side circumference of a middle rod in the device is clung to the inner surface of an upper layer screw hole; a lower rod in the device passes through an upper-layer screw hole, and the bottom end surface of the lower rod is just attached to the upper periphery of a hole of a lower-layer screw hole;
b. rotating the device by taking the central axis of the device as a center, and scanning the upper periphery of the hole of the upper-layer screw hole by an eddy current detection probe which is fixed on the bottom end surface of the upper rod and surrounds the part of the upper end surface of the middle rod; the eddy current detection probe group fixed on the side circumferential surface of the middle rod scans the inner surface of the upper-layer screw hole; an eddy current detection probe fixed on the bottom end face of the lower rod scans the upper periphery of a hole of the lower layer screw hole; the device rotates for a circle, and eddy current scanning of the upper periphery of the hole of the upper layer screw hole, the inner surface of the upper layer screw hole and the upper periphery of the hole of the lower layer screw hole can be completed;
c. the device is inserted into the lower-layer screw hole from bottom to top, and the part of the bottom end surface of the upper rod in the device, which surrounds the upper end surface of the middle rod, is just attached to the lower periphery of the hole of the lower-layer screw hole; the side circumference of the middle rod in the device is tightly attached to the inner surface of the lower screw hole; a lower rod in the device passes through a lower layer screw hole, and the bottom end surface of the lower rod is just attached to the lower periphery of a hole of an upper layer screw hole;
d. rotating the device by taking the central axis of the device as a center, and scanning the lower periphery of a hole of a lower-layer screw hole by using an eddy current detection probe which is fixed on the bottom end surface of the upper rod and surrounds the part of the upper end surface of the middle rod; the eddy current detection probe group fixed on the side circumferential surface of the middle rod scans the inner surface of the lower layer screw hole; the eddy current detection probe fixed on the bottom end face of the lower rod scans the lower periphery of the hole of the upper-layer screw hole; the eddy current scanning of the lower periphery of the lower layer screw hole, the inner surface of the lower layer screw hole and the lower periphery of the upper layer screw hole can be completed by rotating the device for one circle.
A double-layer coaxial screw hole detection device further comprises an upper rod, a middle rod, a plurality of lower rods and a plurality of eddy current detection probes, wherein the upper rod is a cylinder, and the outer diameter of the upper rod is larger than the diameter of a screw hole to be detected; the middle rod is a cylinder, the outer diameter of the middle rod is equal to the diameter of the screw hole to be detected, and the upper end face of the middle rod is fixed in the center of the bottom end face of the upper rod; a plurality of eddy current detection probes are fixed on the part, surrounding the upper end face of the middle rod, of the bottom end face of the upper rod, a plurality of rows of eddy current detection probe groups are radially fixed on the lateral peripheral surface of the middle rod, and each row of eddy current detection probe group is formed by arranging a plurality of eddy current detection probes; the lower rods are elastic rods, the upper end faces of the lower rods are fixed on the bottom end face of the middle rod, the lower rods incline outwards by taking the central axis of the middle rod as the center, the length of the lower rods in the direction perpendicular to the bottom end face of the middle rod is equal to the distance between the double-layer screw holes, and the rotating inner diameter of the bottom end faces of the lower rods by taking the central axis of the middle rod as the center is equal to the diameter of the screw holes; one or more eddy current testing probes are fixed on the bottom end face of each lower rod. Therefore, in the detection process, the device rotates by a small angle, and scanning can be finished.
The double-layer coaxial screw hole detection device and method have the advantages that the detection rod with the unique structure is adopted and is respectively inserted into the upper-layer screw hole and the lower-layer screw hole to carry out rotary scanning, eddy current scanning of the double-layer screw hole can be completed through two times of rotary scanning, the problem of screw hole defect detection of a double-layer screw hole workpiece is effectively solved, and the detection efficiency is greatly improved.
The present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited to the embodiments.
Drawings
The invention will be further elucidated with reference to an embodiment in the drawing.
Fig. 1 is a schematic three-dimensional structure diagram of a double-layer coaxial screw hole detection apparatus according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a double-layer coaxial screw hole detection apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic view of a double-layer coaxial screw hole detection apparatus and a double-layer screw hole workpiece according to an embodiment of the present invention.
Fig. 4 is a schematic view of a double-layer coaxial screw hole detection method according to an embodiment of the present invention.
Fig. 5 is a schematic three-dimensional structure diagram of a double-layer coaxial screw hole detection apparatus according to a second embodiment of the present invention.
In the figure, 1 is an upper rod, 2 is a middle rod, 3 is a lower rod, 4 is an eddy current detection probe, 40 is an eddy current detection probe group, 5 is an upper layer screw hole, and 6 is a lower layer screw hole.
Detailed Description
First embodiment, as shown in fig. 1, 2, 3, and 4, a double-layer coaxial screw hole detection device includes an upper rod 1, a middle rod 2, a lower rod 3, and a plurality of eddy current inspection probes 4, and is characterized in that: the upper rod 1 is a cylinder, and the outer diameter of the upper rod is larger than the diameter of the screw hole to be detected; the middle rod 2 is a cylinder, the outer diameter of the middle rod is equal to the diameter of the screw hole to be detected, and the upper end face of the middle rod 2 is fixed at the center of the bottom end face of the upper rod 1; the eddy current detection probe 4 is fixed on the part of the bottom end surface of the upper rod 1 surrounding the upper end surface of the middle rod 2, a row of eddy current detection probe groups 40 are radially fixed on the side peripheral surface of the middle rod 2, and each eddy current detection probe group 40 is formed by arranging a plurality of eddy current detection probes 4; the lower rod 3 is an elastic rod, the upper end face of the lower rod 3 is fixed on the bottom end face of the middle rod 2, the lower rod 3 inclines outwards by taking the central axis of the middle rod 2 as the center, the length of the lower rod 3 in the direction perpendicular to the bottom end face of the middle rod 2 is equal to the distance between the double-layer screw holes, and the rotating inner diameter of the bottom end face of the lower rod 3 by taking the central axis of the middle rod 2 as the center is equal to the diameter of the screw holes; an eddy current testing probe 4 is fixed on the bottom end surface of the lower rod 3.
The double-layer coaxial screw hole detection method is characterized in that the device is adopted: the device is respectively inserted into an upper layer screw hole 5 and a lower layer screw hole 6 for rotary scanning, and the eddy current scanning of the double-layer screw hole can be completed through two rotary scanning, which comprises the following steps,
a. the device is inserted into the upper-layer screw hole 5 from top to bottom, and the part of the bottom end surface of an upper rod 1 in the device, which surrounds the upper end surface of a middle rod 2, is just attached to the upper periphery of the hole of the upper-layer screw hole 5; the side peripheral surface of a middle rod 2 in the device is tightly attached to the inner surface of an upper layer screw hole 5; a lower rod 3 in the device passes through an upper layer screw hole 5, and the bottom end surface of the lower rod 3 is just attached to the upper periphery of a hole of a lower layer screw hole 6;
b. rotating the device by taking the central axis of the device as a center, and scanning the upper periphery of the hole of the upper-layer screw hole 5 by an eddy current detection probe 4 fixed on the bottom end surface of the upper rod 1 and surrounding the part of the upper end surface of the middle rod 2; the eddy current detection probe group 40 fixed on the side circumferential surface of the middle rod 2 scans the inner surface of the upper layer screw hole 5; an eddy current detection probe 4 fixed on the bottom end surface of the lower rod 3 scans the upper periphery of a hole of the lower layer screw hole 6; the device rotates for a circle, and eddy current scanning of the upper periphery of the hole of the upper layer screw hole 5, the inner surface of the upper layer screw hole 5 and the upper periphery of the hole of the lower layer screw hole 6 can be completed;
c. the device is inserted into a lower-layer screw hole 6 from bottom to top, and the part of the bottom end surface of an upper rod 1 in the device, which surrounds the upper end surface of a middle rod 2, is just attached to the lower periphery of a hole of the lower-layer screw hole 6; the side peripheral surface of a middle rod 2 in the device is tightly attached to the inner surface of a lower layer screw hole 6; a lower rod 3 in the device passes through a lower layer screw hole 6, and the bottom end surface of the lower rod 3 is just clung to the lower periphery of a hole of an upper layer screw hole 5;
d. rotating the device by taking the central axis of the device as a center, and scanning the lower periphery of a lower-layer screw hole 6 by an eddy current detection probe 4 fixed on the bottom end surface of the upper rod 1 and surrounding the upper end surface of the middle rod 2; the eddy current detection probe group 40 fixed on the side circumferential surface of the middle rod 2 scans the inner surface of the lower layer screw hole 6; an eddy current detection probe 4 fixed on the bottom end surface of the lower rod 3 scans the lower periphery of the hole of the upper-layer screw hole 5; the eddy current scanning of the lower periphery of the lower layer screw hole 6, the inner surface of the lower layer screw hole 6 and the lower periphery of the upper layer screw hole 5 can be completed by rotating the device for one circle.
In the second embodiment, as shown in fig. 5, a double-layer coaxial screw hole detection device further includes an upper rod 1, a middle rod 2, a plurality of lower rods 3, and a plurality of eddy current detection probes 4, where the upper rod 1 is a cylinder, and the outer diameter of the cylinder is greater than the diameter of a screw hole to be detected; the middle rod 2 is a cylinder, the outer diameter of the middle rod is equal to the diameter of the screw hole to be detected, and the upper end face of the middle rod 2 is fixed at the center of the bottom end face of the upper rod 1; a plurality of eddy current detection probes 4 are fixed on the part, surrounding the upper end face of the middle rod 2, of the bottom end face of the upper rod 1, a plurality of eddy current detection probe groups 40 are radially fixed on the side peripheral face of the middle rod 2, and each eddy current detection probe group 40 is formed by arranging the eddy current detection probes 4; the lower rods 3 are elastic rods, the upper end faces of the lower rods 3 are fixed on the bottom end face of the middle rod 2, the lower rods 3 are inclined outwards by taking the central axis of the middle rod 2 as the center, the length of the lower rods 3 in the direction perpendicular to the bottom end face of the middle rod 2 is equal to the distance between the double-layer screw holes, and the rotating inner diameter of the bottom end face of each lower rod 3 by taking the central axis of the middle rod 2 as the center is equal to the diameter of the screw hole; one or more eddy current inspection probes 4 are fixed to the bottom end surface of each lower rod 3.
The above embodiments are only used to further illustrate the double-layer coaxial screw hole detection apparatus and method of the present invention, but the present invention is not limited to the embodiments, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention fall within the protection scope of the technical solution of the present invention.

Claims (1)

1. The utility model provides a double-deck coaxial screw detection method, the detection device who adopts includes upper boom, king-rod, lower beam, a plurality of eddy current test probe, its characterized in that: the upper rod is a cylinder, and the outer diameter of the upper rod is larger than the diameter of the screw hole to be detected; the middle rod is a cylinder, the outer diameter of the middle rod is equal to the diameter of the screw hole to be detected, and the upper end face of the middle rod is fixed in the center of the bottom end face of the upper rod; the part of the bottom end surface of the upper rod, which surrounds the upper end surface of the middle rod, is fixedly provided with an eddy current detection probe, and a row of eddy current detection probe groups are radially fixed on the lateral peripheral surface of the middle rod and are formed by arranging a plurality of eddy current detection probes; the lower rod is an elastic rod, the upper end face of the lower rod is fixed on the bottom end face of the middle rod, the lower rod inclines outwards by taking the central axis of the middle rod as a center, the length of the lower rod in the direction perpendicular to the bottom end face of the middle rod is equal to the distance between the double-layer screw holes, and the rotating inner diameter of the bottom end face of the lower rod by taking the central axis of the middle rod as a center is equal to the diameter of the screw holes; the bottom end face of lower beam fixes an eddy current inspection probe, its characterized in that: the device is respectively inserted into an upper layer screw hole and a lower layer screw hole for rotary scanning, and eddy current scanning of the double-layer screw hole can be completed through two times of rotary scanning; the side circumference of a middle rod in the device is clung to the inner surface of an upper layer screw hole; a lower rod in the device passes through an upper-layer screw hole, and the bottom end surface of the lower rod is just attached to the upper periphery of a hole of a lower-layer screw hole; b. rotating the device by taking the central axis of the device as a center, and scanning the upper periphery of the hole of the upper-layer screw hole by an eddy current detection probe which is fixed on the bottom end surface of the upper rod and surrounds the part of the upper end surface of the middle rod; the eddy current detection probe group fixed on the side circumference of the middle rod scans the inner surface of the upper screw hole; an eddy current detection probe fixed on the bottom end face of the lower rod scans the upper periphery of a hole of the lower layer screw hole; the device rotates for a circle, and eddy current scanning of the upper periphery of the hole of the upper layer screw hole, the inner surface of the upper layer screw hole and the upper periphery of the hole of the lower layer screw hole can be completed; c. the device is inserted into the lower-layer screw hole from bottom to top, and the part of the bottom end surface of the upper rod in the device, which surrounds the upper end surface of the middle rod, is just attached to the lower periphery of the hole of the lower-layer screw hole; the side peripheral surface of a middle rod in the device is tightly attached to the inner surface of a lower layer screw hole; a lower rod in the device passes through a lower layer screw hole, and the bottom end surface of the lower rod is just attached to the lower periphery of a hole of an upper layer screw hole; d. rotating the device by taking the central axis of the device as a center, and scanning the lower periphery of a hole of a lower-layer screw hole by using an eddy current detection probe which is fixed on the bottom end surface of the upper rod and surrounds the part of the upper end surface of the middle rod; the eddy current detection probe group fixed on the side circumferential surface of the middle rod scans the inner surface of the lower layer screw hole; scanning the lower periphery of the hole of the upper screw hole by an eddy current detection probe fixed on the bottom end surface of the lower rod; the eddy current scanning of the lower periphery of the lower layer screw hole, the inner surface of the lower layer screw hole and the lower periphery of the upper layer screw hole can be completed by rotating the device for one circle.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012202984A (en) * 2011-03-28 2012-10-22 Micro-Fix Co Ltd Vortex flaw detection probe and vortex flaw detector
KR20130013681A (en) * 2011-07-28 2013-02-06 한국전력공사 Apparatus for inspecting bolt and bolt hole defect
CN103344745A (en) * 2013-07-12 2013-10-09 爱德森（厦门）电子有限公司 Device and method for automatically and spirally scanning inner wall of screw hole by eddy
CN204064225U (en) * 2014-06-24 2014-12-31 吴朝芳 A kind of pneumatic internal thread detection device for automotive hub
CN206057251U (en) * 2016-09-29 2017-03-29 爱德森（厦门）电子有限公司 A kind of double-layer coaxial screw hole detection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012202984A (en) * 2011-03-28 2012-10-22 Micro-Fix Co Ltd Vortex flaw detection probe and vortex flaw detector
KR20130013681A (en) * 2011-07-28 2013-02-06 한국전력공사 Apparatus for inspecting bolt and bolt hole defect
CN103344745A (en) * 2013-07-12 2013-10-09 爱德森（厦门）电子有限公司 Device and method for automatically and spirally scanning inner wall of screw hole by eddy
CN204064225U (en) * 2014-06-24 2014-12-31 吴朝芳 A kind of pneumatic internal thread detection device for automotive hub
CN206057251U (en) * 2016-09-29 2017-03-29 爱德森（厦门）电子有限公司 A kind of double-layer coaxial screw hole detection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Evaluation of Eddy-Current Probe Signals Due to Cracks in Fastener Holes;John R. Bowler 等;《IEEE TRANSACTIONS ON MAGNETIC》;20121231;第48卷(第3期);第1159-1170页 *

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