JP3793396B2 - Cylinder head blockage inspection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder head blockage inspection device for inspecting a blockage degree in a head cooling water passage of a cylinder.
[0002]
[Prior art]
The cylinder head, which is a component of the engine, uses the core during casting to form a cooling water passage in the head. However, the cooling water passage is used due to unforeseen reasons such as core breakage, sand seizure, and sand residue. May become partially clogged and occluded. In such a clogged cooling water passage, various adverse effects such as engine seizure due to poor cooling are induced. For this reason, it is necessary to inspect whether or not the cooling water passage is blocked after casting.
[0003]
As an apparatus for inspecting the presence or absence of blockage in the coolant passage of the cylinder head, there is a blockage inspection apparatus shown in FIG. The blockage inspection apparatus includes a pair of light projecting units 1 and an imaging unit 2. The light projecting unit 1 is disposed opposite to an optical fiber (light guide) 3 having an upper end connected to a light source (not shown) and an outlet of the optical fiber 3, and light incident from the light source via the optical fiber 3. And a flat mirror (projecting mirror) 4 for reflecting the light. As shown in FIG. 5, the flat mirror 4 is obtained by joining and integrating two flat mirrors 4a and 4b with different projection angles. On the other hand, the imaging unit 2 includes a convex mirror 5 and a micro camera (imaging means) 7 such as a CCD camera that receives the reflected light of the convex mirror 5 through a lens 6 and images it.
[0004]
In the blockage inspection apparatus having the above-described configuration, when the presence or absence of blockage in the cooling water passage 10 formed between the sand removal holes 9.9 provided on the upper surface side of the cylinder head 8 is inspected, the light projecting unit 1 and the imaging unit 2 are The flat mirror 4 and the convex mirror 7 are respectively inserted into the sand holes 9 and 9 through the cooling water passage 10 so as to face each other, and then light is projected from the light source to the flat mirror 4 through the optical fiber 3. The light La reflected by the mirror 4 is projected toward the cooling water passage 10. Then, the light La passes through the cooling water passage 10 while being irregularly reflected, and then enters the convex mirror 5 to be reflected. Then, the reflected light is received by the micro camera 7 through the lens 6 and images the inside of the cooling water passage 10 in a two-dimensional plane. Then, a feature such as a brightness area is identified from the captured image in the cooling water passage 10 shown in FIG. 6 to determine whether or not the cooling water passage 10 is blocked.
[0005]
[Problems to be solved by the invention]
By the way, in the conventional blockage inspection apparatus described above, since the incident angle of the light La reflected from the flat mirror 4 to the cooling water passage 10 is constant, it is expected that the light La enters the complicated cooling water passage 10. Can not. Therefore, the amount of light passing through the cooling water passage 10 and entering the imaging unit 2 is reduced, and the captured image in the cooling water passage 10 by the micro camera 7 becomes dark due to insufficient light quantity. When the captured image is dark as described above, it is difficult to inspect the blocking state of the cooling water passage 10 in proportion, and only the complete blocking and the approximate blocking state of the cooling water passage 10 can be inspected. For this reason, the blocking rate of the cooling water passage 10 of the cylinder head 8 is partially 30%, for example, and there is a problem that the engine function must be treated as a rejected product even though it is a passed product. Therefore, since the blockage rate is not known in the inspection of only the complete blockage and the approximate blockage state of the cooling water passage 10, as a factory guarantee, it is necessary to perform a sampling test in which the blockage rate is checked by extracting the cylinder head and cutting it. It was.
[0006]
Therefore, an object of the present invention is to provide a cylinder head blockage inspection device that can also inspect the closed state of the cylinder head in the coolant passage even by a ratio.
[0007]
[Means for Solving the Problems]
To achieve the above object, the occlusion test apparatus of a cylinder head according to the present invention, a light guide connected to a light emitting source, is disposed opposite the outlet of the light guide, incident through the light guide from the light source A light projection mirror that projects light toward the cooling water passage in the cylinder head, and a light projection mirror that is disposed opposite the light projection mirror through the cooling water passage. a convex mirror for reflecting the light in the closed inspection apparatus of a cylinder head comprising an imaging means for secondary plane imaged by receiving the reflected light of the convex mirror, the light projecting mirror incident through the light guide from the light source Is a cone-type mirror that diffuses and reflects radially toward the cooling water passage in the cylinder head .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a cylinder head blockage inspection apparatus according to the present invention will be described with reference to FIGS. FIG. 1 shows a longitudinal sectional view of a main part of the apparatus of the present invention, in which 11 is a light projecting unit, and 12 is an imaging unit. The light projecting unit 11 has an optical fiber (light guide) 13 whose upper end is connected to a light source (not shown), and a cone-shaped mirror (light projecting mirror) 14 that is disposed to face the outlet of the optical fiber 13. . The cone-shaped mirror 14 has a conical shape with a conical surface formed as a mirror surface, and light incident from the light source via the optical fiber 13 is omnidirectional (however, even if it is omnidirectional, about 300 °). Is diffused and reflected toward the Further, the imaging unit 12 includes a convex mirror 15 and a micro camera (imaging means) 17 such as a CCD camera that receives the reflected light of the convex mirror 15 through a lens 16 and images it.
[0009]
Next, the operation of the device of the present invention having the above configuration will be described. First, the light projecting unit 11 and the image pickup unit 12 are inserted into sand removal holes 19 and 19 each having an upper surface side of the cylinder head 18, and the cone-type mirror 14 and the convex mirror 15 are arranged to face each other through the cooling water passage 20. After that, light is projected from the light source to the cone mirror 14 via the optical fiber 13. Then, the light incident on the cone mirror 14 is diffused and reflected radially toward all directions, and the light Lb enters the cooling water passage 20. The light Lb is diffusely reflected through the cooling water passage 20 and then incident on the convex mirror 15 to be reflected. Then, the reflected light is received by the micro camera 17 through the lens 16 and images the inside of the cooling water passage 20 in a plane.
[0010]
In the device of the present invention, the light Lb incident on the cone-shaped mirror 14 is radially diffused in all directions and projected onto the cooling water passage 20, so that light is reflected on the complicated shape in the cooling water passage 20. The amount of light passing through the cooling water passage 20 and entering the imaging unit 12 is greatly increased. Therefore, the image captured in the cooling water passage 20 by the micro camera 17 becomes brighter, and until now, only the complete blockage and the approximate blockage state of the cooling water passage 20 could be inspected. But now it can be inspected.
[0011]
【The invention's effect】
As described above, according to the device of the present invention, the amount of light passing through the imaging unit can be reduced by diffusing light radially in all directions with the cone-shaped mirror and entering the cooling water passage of the cylinder head. The imaging screen is greatly increased and a bright imaging screen is obtained, so it is possible to inspect not only the complete blockage in the cooling water passage but also the blockage state at a ratio, improving the inspection accuracy and cutting the conventional cylinder head This eliminates the need for a sampling inspection for inspecting the blocking ratio, thereby reducing the number of man-hours.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a cylinder head blockage inspection apparatus according to the present invention.
FIG. 2 is a cross-sectional view of an essential part showing irregularly reflected light in a cooling water passage.
FIG. 3 is a diagram showing an example of a captured image according to the present invention.
FIG. 4 is a longitudinal sectional view of a main part showing an embodiment of a conventional blockage inspection apparatus.
FIG. 5 is a plan view of a conventional flat mirror.
FIG. 6 is a diagram illustrating a conventional captured image.
[Explanation of symbols]
11 Projection unit 12 Imaging unit 13 Optical fiber (light guide)
14 Cone-type mirror
15 Concave mirror 16 Lens 17 Miniature camera (imaging means)
18 Cylinder head 19 Sand removal hole 20 Cooling water passage Lb Light

Claims (1)

A light guide connected to a light source;
Disposed opposite the outlet of the light guide, a light projecting mirror for projecting light the light incident through the light guide from the light source toward the coolant passage in the cylinder head,
A convex mirror that is disposed opposite to the projection mirror via the cooling water passage, and reflects light incident from the projection mirror through the cooling water passage;
In the cylinder head blockage inspection apparatus comprising imaging means for receiving the reflected light of the convex mirror and imaging in a second-order plane,
The projection mirror is a cone-shaped mirror that diffuses and reflects light incident from a light source through a light guide radially toward a cooling water passage in the cylinder head. Inspection device.

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