CN110726731A - Small-caliber long straight pipe inner wall defect detection device - Google Patents
Small-caliber long straight pipe inner wall defect detection device Download PDFInfo
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- CN110726731A CN110726731A CN201911139333.1A CN201911139333A CN110726731A CN 110726731 A CN110726731 A CN 110726731A CN 201911139333 A CN201911139333 A CN 201911139333A CN 110726731 A CN110726731 A CN 110726731A
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- 230000007547 defect Effects 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 34
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- 239000011324 bead Substances 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 230000002950 deficient Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N2021/555—Measuring total reflection power, i.e. scattering and specular
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Textile Engineering (AREA)
- Engineering & Computer Science (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
A device for detecting defects on the inner wall of a small-caliber long straight pipe belongs to the technical field of visual detection. The device for detecting the defects of the inner wall of the small-caliber long straight pipe comprises a columnar light source seat, a hollow probe and an LED light source; the columnar light source seat is sleeved on a hollow probe tube, and the hollow probe tube is used for extending the columnar light source seat into different height positions in the workpiece; the side wall of the columnar light source seat is provided with a first opening, the hollow probe tube is provided with a second opening corresponding to the first opening, and the first opening and the second opening form an imaging hole; a plurality of LED light sources are arranged on one side of the columnar light source seat around the imaging hole and correspond to the imaging hole, and a plane reflector is arranged in the hollow probe tube. The invention can obtain highly uniform images under an ideal illumination state and avoid the influence of local image distortion on defect detection.
Description
Technical Field
The invention relates to a technology in the field of visual detection, in particular to a device for detecting defects on the inner wall of a small-caliber long straight pipe.
Background
The existing cylinder inner wall defect detection, particularly the inner wall surface defect detection, has various detection modes, and different detection devices, such as a hard endoscope, an optical fiber endoscope and the like, are adopted according to different detection objects. However, the hard endoscope generally adopts a coaxial light source, the illumination effect is not ideal enough, the situations of incapability of acquiring images, local distortion of the acquired images and the like exist in the case of detecting defects of the inner wall of a small-caliber long straight tube, and the high-precision detection cannot be realized because the resolution of the optical fiber endoscope is general and the detected images are not clear enough.
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the device for detecting the defects on the inner wall of the small-caliber long straight pipe, which can acquire a highly uniform image under an ideal illumination state and avoid the influence of local image distortion on defect detection.
The invention comprises a columnar light source seat, a hollow probe tube and an LED light source; the columnar light source seat is sleeved on a hollow probe tube, and the hollow probe tube is used for extending the columnar light source seat into different height positions in the workpiece; the side wall of the columnar light source seat is provided with a first opening, the hollow probe tube is provided with a second opening corresponding to the first opening, and the first opening and the second opening form an imaging hole; a plurality of LED light sources are arranged on one side of the columnar light source seat around the imaging hole and correspond to the imaging hole, and a plane reflector is arranged in the hollow probe tube and used for reflecting light formed by the LED light sources irradiating on the inner wall of the workpiece to be measured.
In some technical schemes, the LED light source comprises an LED lamp bead, a printed circuit board and a light source support, the LED lamp bead is fixedly connected with the printed circuit board, the printed circuit board is fixed on the light source support, the light source support is rotatably connected with the columnar light source seat through a pin shaft structure so as to adjust the irradiation direction of the LED light source, and the light source support and the columnar light source seat are positioned and locked through jackscrews so as to fix the adjusted irradiation direction of the LED light source.
Preferably, the imaging holes are arranged up and down symmetrically along a horizontal plane and left and right symmetrically along a longitudinal plane; further preferably, it is substantially V-shaped or U-shaped.
Preferably, the plane reflector and the hollow probe are arranged at an included angle of 45 degrees in the axial direction.
Preferably, a rotating platform is further arranged, and the hollow probe tube and the rotating platform are arranged up and down; the rotating platform is used for fixing the workpiece and driving the workpiece to rotate at a certain speed.
Preferably, the hollow probe tube is connected with an industrial lens through a connecting piece, and the industrial lens is connected with the CCD camera.
Preferably, the diameters of two ends of the connecting piece are adjustable, so that the hollow probe tubes with different sizes and models can be conveniently butted with the industrial lens; further preferably, the two ends of the connecting piece adopt a hoop structure, and the hollow probe tube and the industrial lens are tightly held by a locking nut.
Technical effects
Compared with the prior art, the invention has the following technical effects:
1) the device is suitable for detecting the defects of the inner wall of the transparent or non-transparent small-caliber long straight pipe, and the irradiation angle of the LED light source is adjustable, so that an ideal illumination effect is conveniently obtained;
2) the plane reflector arranged at an included angle of 45 degrees with the axial direction of the hollow probe tube reflects the light on the inner wall of the workpiece to the industrial lens, so that the shot image is free from local distortion;
3) the method comprises the steps of obtaining 360-degree images of different height positions of the inner wall of a workpiece by rotating the workpiece, splicing the images by splicing software to obtain a 360-degree unfolded image, identifying the images by the existing image identification software, and increasing the accuracy of defect size identification to 8 mu m, wherein the detection efficiency is high;
drawings
FIG. 1 is a schematic view of the entire structure of embodiment 1;
FIG. 2 is a schematic view of a cylindrical light source holder, a hollow probe tube and an LED light source in example 1;
FIG. 3 is a schematic view of a cylindrical light source holder and an LED light source in example 1;
in the figure: a columnar light source base 1;
the LED lamp comprises an LED light source 2, an LED lamp bead 21, a printed circuit board 22 and a light source bracket 23;
a hollow probe 3, a plane mirror 31;
the device comprises an industrial lens 4, an industrial camera 5, a rotary table 6, a connecting piece 7, a plug tongue 8, a pin shaft 9, a jackscrew 10 and an imaging hole 11;
a workpiece 100 to be tested.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1, 2 and 3, the present embodiment includes: the device comprises a columnar light source seat 1, an LED light source 2, a hollow probe 3, an industrial lens 4, an industrial camera 5 and a rotary table 6; the hollow probe tube 3 and the rotary table 6 are arranged up and down, the hollow probe tube 3, the industrial lens 4 and the CCD camera 5 are sequentially connected, and the columnar light source seat 1 is sleeved on the hollow probe tube 3 and locked by a nut;
the side wall of the columnar light source seat 1 is provided with a first opening, the hollow probe tube 3 is provided with a second opening corresponding to the first opening, and the first opening and the second opening form an imaging hole 11; a plurality of LED light sources 2 are arranged on one side of the columnar light source 1 around the imaging hole 11, a plane reflector 31 is arranged in the hollow probe tube 3 corresponding to the imaging hole 11, the plane reflector 31 can be a plane glass reflector or a plane metal reflector, and the plane reflector 31 reflects reflected light formed by the LED light sources 2 irradiating the inner wall of the workpiece 100 to be measured to the industrial lens 4.
The rotating platform 6 is used for fixing the workpiece 100 to be measured, and driving the workpiece to rotate at a certain speed and high precision, so that the rotating stability is ensured, and high-quality images can be acquired.
The industrial lens 4 adopts a telecentric lens, has high-resolution and low-distortion imaging effect, and has high matching degree with the inner wall defect detection scene of the small-caliber long straight tube in the embodiment; the CCD camera 5 adopts a linear array CCD camera, and can quickly acquire images.
The hollow probe 3 and the industrial lens 4 are connected by a connecting piece 7; the diameters of the two ends of the connecting piece 7 are adjustable, and preferably, a hoop structure is adopted and is locked through a locking nut.
The imaging holes 11 are substantially V-shaped or U-shaped, are arranged vertically symmetrically along a horizontal plane, and are arranged laterally symmetrically along a longitudinal plane.
The plane reflector and the hollow probe tube are axially arranged at an included angle of 45 degrees; all the LED light sources irradiate towards the same area on the inner wall of the workpiece to be measured.
The LED light source 2 comprises an LED lamp bead 21, a printed circuit board 22 and a light source support 23, the LED lamp bead 21 is fixedly connected with the printed circuit board 22, and the printed circuit board 22 is fixed on the light source support 23; the bottom of the light source support 23 is provided with a U-shaped groove, the columnar light source seat 1 is correspondingly provided with an inserting tongue 8, the inserting tongue 8 is arranged in the U-shaped groove at the bottom of the light source support 23 and is connected and rotated through a pin shaft 9 to adjust the irradiation direction of the LED light source, and the light source support 23 and the columnar light source seat 1 are positioned and locked through a jackscrew 10 to fix the adjusted irradiation direction of the LED light source.
When the working of the embodiment of the invention, the LED light source emits light rays which uniformly irradiate on the inner wall of a workpiece to be detected, the non-defective part on the inner wall is mirror reflection, the defective part is non-mirror reflection, the area reflection light is reflected by the plane reflector to reach the industrial lens and the linear scanning CCD camera, a 360-degree unfolded image of the inner wall of the cylinder is obtained under the condition that the rotating table drives the workpiece to rotate, the mirror reflection of the non-defective part presents a bright area on the image, the defective part presents a dark area, and the image is identified to finish the inner wall defect detection.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A defect detection device for the inner wall of a small-caliber long straight pipe is characterized by comprising a columnar light source seat, a hollow probe and an LED light source; the columnar light source seat is sleeved on a hollow probe tube, and the hollow probe tube is used for extending the columnar light source seat into different height positions in the workpiece; the side wall of the columnar light source seat is provided with a first opening, the hollow probe tube is provided with a second opening corresponding to the first opening, and the first opening and the second opening form an imaging hole; a plurality of LED light sources are arranged on one side of the columnar light source seat around the imaging hole and correspond to the imaging hole, and a plane reflector is arranged in the hollow probe tube and used for reflecting light formed by the LED light sources irradiating on the inner wall of the workpiece to be measured.
2. The apparatus according to claim 1, wherein the LED light source comprises an LED lamp bead, a printed circuit board, and a light source holder, the LED lamp bead is fixedly connected to the printed circuit board, the printed circuit board is fixed to the light source holder, the light source holder is rotatably connected to the columnar light source holder through a pin structure to adjust an irradiation direction of the LED light source, and the light source holder and the columnar light source holder are locked by a jackscrew to fix the adjusted irradiation direction of the LED light source.
3. The apparatus for detecting the inner wall defect of a small-caliber long straight pipe according to claim 1, wherein the imaging holes are arranged vertically symmetrically along a horizontal plane and are arranged laterally symmetrically along a longitudinal plane.
4. The apparatus for detecting the inner wall defect of the small-caliber long straight pipe according to claim 1, wherein the plane mirror and the hollow probe are arranged at an included angle of 45 degrees along the axial direction.
5. The apparatus for detecting the inner wall defect of a small-diameter long straight pipe according to claim 1, further comprising a rotary table for holding the workpiece and rotating the workpiece at a constant speed.
6. The apparatus for detecting the defect on the inner wall of the small-caliber long straight pipe as claimed in claim 1, wherein the hollow probe is connected with an industrial lens through a connecting member, and the industrial lens is connected with a CCD camera.
7. The apparatus for detecting the inner wall defect of the small-diameter long straight pipe as claimed in claim 6, wherein the two ends of the connecting member are in a hoop structure, the diameter of the connecting member is adjustable, and the hollow probe and the industrial lens are held tightly by a locking nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911139333.1A CN110726731A (en) | 2019-11-20 | 2019-11-20 | Small-caliber long straight pipe inner wall defect detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911139333.1A CN110726731A (en) | 2019-11-20 | 2019-11-20 | Small-caliber long straight pipe inner wall defect detection device |
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| Publication Number | Publication Date |
|---|---|
| CN110726731A true CN110726731A (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911139333.1A Pending CN110726731A (en) | 2019-11-20 | 2019-11-20 | Small-caliber long straight pipe inner wall defect detection device |
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| Country | Link |
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| CN (1) | CN110726731A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111932599A (en) * | 2020-07-31 | 2020-11-13 | 泉州市澳莱格电子有限责任公司 | Cylinder two-dimensional image generation method based on multiple RGB-D cameras |
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| CN204572993U (en) * | 2015-04-25 | 2015-08-19 | 苏州灵猴机器人有限公司 | There is the transmission shaft structure of guide support |
| CN205280541U (en) * | 2015-12-21 | 2016-06-01 | 晶格码（青岛）智能科技有限公司 | Probe formula process imager |
| CN205449824U (en) * | 2015-03-27 | 2016-08-10 | 日本电产东测有限公司 | Inner surface inspection device |
| KR20170027482A (en) * | 2015-09-02 | 2017-03-10 | 성현엠엔티(주) | Apparatus for internal inspection of pipe |
| CN106525867A (en) * | 2016-12-29 | 2017-03-22 | 重庆市江津区恩聪机械厂 | Visual detection device of air cylinder shell defect detection system |
| CN107014829A (en) * | 2017-06-13 | 2017-08-04 | 青岛理工大学 | Device and method for detecting quality defects of inner surface of hole based on total reflection dynamic image acquisition |
| CN211235584U (en) * | 2019-11-20 | 2020-08-11 | 苏州灵猴机器人有限公司 | Small-caliber long straight pipe inner wall defect detection device |
-
2019
- 2019-11-20 CN CN201911139333.1A patent/CN110726731A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205449824U (en) * | 2015-03-27 | 2016-08-10 | 日本电产东测有限公司 | Inner surface inspection device |
| CN204572993U (en) * | 2015-04-25 | 2015-08-19 | 苏州灵猴机器人有限公司 | There is the transmission shaft structure of guide support |
| KR20170027482A (en) * | 2015-09-02 | 2017-03-10 | 성현엠엔티(주) | Apparatus for internal inspection of pipe |
| CN205280541U (en) * | 2015-12-21 | 2016-06-01 | 晶格码（青岛）智能科技有限公司 | Probe formula process imager |
| CN106525867A (en) * | 2016-12-29 | 2017-03-22 | 重庆市江津区恩聪机械厂 | Visual detection device of air cylinder shell defect detection system |
| CN107014829A (en) * | 2017-06-13 | 2017-08-04 | 青岛理工大学 | Device and method for detecting quality defects of inner surface of hole based on total reflection dynamic image acquisition |
| CN211235584U (en) * | 2019-11-20 | 2020-08-11 | 苏州灵猴机器人有限公司 | Small-caliber long straight pipe inner wall defect detection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111932599A (en) * | 2020-07-31 | 2020-11-13 | 泉州市澳莱格电子有限责任公司 | Cylinder two-dimensional image generation method based on multiple RGB-D cameras |
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