阅读说明：本技术 小口径长直管内壁缺陷检测装置 (Small-caliber long straight pipe inner wall defect detection device ) 是由 董文娟 吴金才 周师发 于 2019-11-20 设计创作，主要内容包括：一种小口径长直管内壁缺陷检测装置,属于视觉检测技术领域。该小口径长直管内壁缺陷检测装置包括柱状光源座、中空探管和LED光源；柱状光源座套设在一中空探管上,中空探管用于将柱状光源座伸入工件内部不同高度位置；柱状光源座在侧壁设有第一开口,中空探管对应第一开口设有第二开口,第一开口和第二开口构成成像孔；绕成像孔在柱状光源座一侧布置有若干LED光源,对应成像孔,中空探管内设有平面反射镜。本发明能够在理想的照明状态下获取高均匀的图像,避免局部图像失真影响缺陷检测。(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.)

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.

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.