Improved bamboo chip optical detection device

Abstract

An improved bamboo chip optical detection device comprises a rack and a camera obscura optical detection mechanism arranged in the rack, and the camera obscura optical detection mechanism is provided with a conveying channel allowing bamboo chips to pass through; the camera obscura optical detection mechanism comprises a camera phase, a light source and a fixing plate for fixing the camera and the light source; the two cameras are respectively arranged at two ends of a diagonal line above and below the bamboo chip to be detected in the center of the camera obscura optical detection mechanism; and the two light sources are respectively arranged at two ends of the other diagonal line above and below the bamboo chip to be detected in the center of the camera obscura optical detection mechanism, or are respectively arranged at two ends of the diagonal line on the same side as the camera. The two light sources and the two cameras are respectively arranged on the two sides of the product, so that the light sources are prevented from entering the visual field of the cameras, the imaging effect of the product is improved, and the detection precision is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical detection devices for bamboo pieces, and in particular relates to an improved optical detection device for bamboo pieces. Background Art

[0002] Bamboo products have been widely used in the building materials and daily life markets. In the process of making bamboo products, bamboo needs to go through many processes, and some processing defects are inevitable. In addition, some bamboos have defects themselves, which will affect the beauty of bamboo products. At this time, it is necessary to manually sort bamboo pieces of different qualities. The emergence of bamboo piece sorting machines can greatly improve production efficiency and reduce labor costs.

[0003] The structure of the traditional bamboo optical detection device on the market is as follows: Figure 1 As shown, the structure uses four cameras and four light sources to detect the four sides of the bamboo product (such as Figure 2 However, the structure of this optical inspection device is prone to flying debris accumulation in the camera at the bottom during use, affecting imaging; the cameras on the left and right sides are closer to the product, and due to the characteristics of the lens, the flying debris occupies a large area in the field of view, affecting the inspection results.

[0004] Chinese utility model patent ZL202020282737.8 discloses a bamboo optical inspection device. Compared with traditional optical inspection devices on the market, this technical solution removes the upper and lower cameras, adds two prisms based on the mirror reflection principle, and uses one camera to detect two surfaces. The prism mirror surface of this technical solution is easy to absorb flying debris, and the prism and the product itself need to have two focal lengths, which has high debugging requirements and is easy to lose focus. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide an improved bamboo piece optical detection device, which has good imaging effect, improved detection accuracy and low cost.

[0006] The utility model is achieved in this way:

[0007] An improved bamboo piece optical detection device comprises: a frame, and a dark box optical detection mechanism arranged in the frame, wherein the dark box optical detection mechanism has a conveying channel for allowing bamboo pieces to pass through; the dark box optical detection mechanism comprises: a camera, a light source, and a fixing plate for fixing the camera and the light source;

[0008] There are two cameras, which are respectively arranged at two ends of a diagonal line above and below the bamboo piece to be inspected located at the center of the dark box optical inspection mechanism, or at two ends of a diagonal line on the same side as the camera;

[0009] The number of the light sources is two, which are respectively arranged at the two ends of the other diagonal line above and below the bamboo piece to be detected in the center of the dark box optical detection mechanism.

[0010] Furthermore, the orientation of the camera is within an angle range of 20° to 60° with respect to the vertical plane.

[0011] Furthermore, the camera is oriented at 45° to the vertical plane.

[0012] Furthermore, the emission direction of the light source located above is directly downward, and the emission direction of the light source located below is directly upward.

[0013] Furthermore, a display is provided on the upper part of the frame for displaying pictures taken by the camera.

[0014] The advantages of the utility model are:

[0015] 1. Two light sources and two cameras are located on both sides of the product, which prevents the light source from entering the camera's field of view, thereby improving the product's imaging effect and detection accuracy.

[0016] 2. Tilting the two cameras at a certain angle can effectively avoid the accumulation of flying chips. Due to the tilt, the camera has a larger working distance, which prevents flying chips from occupying a large area in the field of view, further improving the detection accuracy.

[0017] 3. Compared with the existing technology, the number of cameras and light sources is reduced. On the one hand, the number of pictures is reduced, which effectively improves the processing time. On the other hand, the reduction in hardware also brings about a reduction in costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0019] Figure 1 It is a structural principle diagram of a bamboo piece optical detection device in the prior art.

[0020] Figure 2 It is a schematic diagram of the structure of the required detection surface of the bamboo piece to be detected (a cross-sectional diagram of the bamboo piece).

[0021] Figure 3 It is a schematic diagram of the appearance of the bamboo piece optical detection device of the present utility model.

[0022] Figure 4 It is a structural principle diagram of the first embodiment of the utility model.

[0023] Figure 5 It is a structural principle diagram of the second embodiment of the utility model.

[0024] Reference numerals:

[0025] 100-bamboo piece, 101-104-detection surface, 1-frame, 2-darkroom optical detection mechanism, 3-display, 201-camera, 202-light source. DETAILED DESCRIPTION

[0026] First embodiment:

[0027] like Figure 3 and Figure 4 As shown, an improved bamboo chip optical detection device includes: a frame 1, and a dark box optical detection mechanism 2 arranged in the frame 1, the dark box optical detection mechanism 2 has a conveying channel allowing the bamboo chip 100 to pass through; the dark box optical detection mechanism 2 includes: a camera 201, a light source 202, and a fixing plate (not shown) for fixing the camera 201 and the light source 202.

[0028] There are two cameras 201, which are respectively arranged at the two ends of a diagonal line above and below the bamboo piece 100 to be inspected, which is located at the center of the dark box optical inspection mechanism 2; optimally, the direction of the camera 201 is 45° to the vertical plane. In specific practice, the direction of the camera 201 is within the range of 20° to 60° to the vertical plane, which is a feasible solution.

[0029] There are two light sources 202, which are respectively arranged at the other two ends of the diagonal line above and below the bamboo piece 100 to be inspected in the center of the dark box optical inspection mechanism 2. The emission direction of the light source 202 located above is directly downward, and the emission direction of the light source 202 located below is directly upward.

[0030] The light source 202 located above illuminates the detection surface 101 and the detection surface 102 of the bamboo piece 100 to be detected. For the detection surface 101, the light source is irradiated from directly above, so the brightness value of the detection surface 101 is relatively high. For the detection surface 102, the light source is irradiated from the side, so the brightness value of the detection surface 102 is relatively low. Such a design facilitates the obvious distinction between the detection surface 101 and the detection surface 102 in the image. Similarly, the light source 202 located below illuminates the detection surface 103 and the detection surface 104 of the bamboo piece 100 to be detected. For the detection surface 103, the light source is irradiated from directly below, so the brightness value of the detection surface 103 is relatively high. For the detection surface 104, the light source is irradiated from the side, so the brightness value of the detection surface 104 is relatively low. The detection surface 103 and the detection surface 104 can be clearly distinguished in the image.

[0031] In this embodiment, a display 3 is also provided on the upper part of the frame 1 for displaying the pictures taken by the camera 201 .

[0032] Second embodiment:

[0033] Different from the first embodiment, the two light sources 202 are respectively arranged at the two ends of the diagonal line on the same side as the camera 201, such as Figure 5 As shown, each light source 202 is disposed near a camera 201 .

[0034] In this embodiment, the light source 202 located above illuminates the detection surface 101 and the detection surface 104 of the bamboo piece 100 to be detected. For the detection surface 101, the light source is irradiated from directly above, so the brightness value of the detection surface 101 is relatively high. For the detection surface 104, the light source is irradiated from the side, so the brightness value of the detection surface 104 is relatively low. Such a design facilitates the obvious distinction between the detection surface 101 and the detection surface 104 in the image. Similarly, the light source 202 located below illuminates the detection surface 103 and the detection surface 102 of the bamboo piece 100 to be detected. For the detection surface 103, the light source is irradiated from directly below, so the brightness value of the detection surface 103 is relatively high. For the detection surface 102, the light source is irradiated from the side, so the brightness value of the detection surface 102 is relatively low. The detection surface 103 and the detection surface 102 can be clearly distinguished in the image.

[0035] The two light sources and two cameras of the utility model are arranged on both sides of the product, which prevents the light source from entering the camera's field of view, thereby improving the imaging effect of the product and improving the detection accuracy. The two cameras are tilted at a certain angle to effectively prevent the accumulation of flying debris. Due to the tilt, the camera has a larger working distance, which prevents the flying debris from occupying a large proportion in the field of view, further improving the detection accuracy. Compared with the existing technology, the number of cameras and light sources is reduced. On the one hand, the number of pictures is reduced, which effectively improves the processing time. On the other hand, the reduction of hardware also brings about a reduction in cost.

[0036] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. An improved bamboo piece optical detection device, comprising: A frame, and a dark box optical detection mechanism disposed in the frame, wherein the dark box optical detection mechanism has a conveying channel allowing bamboo pieces to pass through; The dark box optical detection mechanism comprises: a camera, a light source, and a fixing plate for fixing the camera and the light source; The invention is characterized in that: the number of the cameras is two, which are respectively arranged at the two ends of a diagonal line above and below the bamboo piece to be inspected located in the center of the dark box optical inspection mechanism; The number of the light sources is two, which are respectively arranged at the positions of the other two diagonal ends above and below the bamboo piece to be detected in the center of the dark box optical detection mechanism, or at the positions of the two ends of the diagonal line on the same side as the camera.

2. The improved bamboo piece optical detection device as claimed in claim 1, characterized in that: The camera is oriented in an angle range of 20° to 60° with respect to the vertical plane.

3. The improved bamboo piece optical detection device as claimed in claim 1, characterized in that: The camera is oriented at 45° to the vertical.

4. The improved bamboo piece optical detection device as claimed in claim 1, characterized in that: The emission direction of the light source located at the top is directly downward, and the emission direction of the light source located at the bottom is directly upward.

5. The improved bamboo piece optical detection device as claimed in claim 1, characterized in that: A display is also provided on the upper part of the frame for displaying the pictures taken by the camera.

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