Multispectral bamboo quality detection system

Abstract

The utility model discloses a multispectral bamboo quality detection system, including frame, feeding unit, light source unit and multispectral camera unit, the frame is provided with camera obscura structure, the feeding unit is provided on the frame and located in the camera obscura structure, the image acquisition area is provided on the feeding unit, the light source unit is provided on the frame, and the multispectral camera unit is provided on the frame and located in the camera obscura structure. And the multi-spectral camera unit is arranged in the camera obscura structure and located above the feeding unit, and the multi-spectral camera unit is arranged on the rack, located at the center of the top of the camera obscura structure and located over the image acquisition area. The bamboo quality evaluation device can effectively solve the problems that quality evaluation before bamboo processing mainly depends on manual work and bamboo bending is not easy to detect at present.

Description

Technical Field

[0001] This utility model relates to the technical field of bamboo quality testing, and in particular to a multispectral bamboo quality testing system. Background Technology

[0002] Bamboo, the raw material for making Silun bamboo steamers, is a natural hydrophilic material. The humidity of the environment has a significant impact on its moisture content. Abnormal moisture content can not only lead to deformation and a decline in mechanical properties of bamboo, but may also cause mold growth. Therefore, it is of great significance to improve the stability of bamboo quality and ensure the sustainable development of the industry by detecting key quality parameters such as bamboo moisture content and mold growth.

[0003] Currently, the detection of bamboo moisture content mostly relies on drying and electrical resistance methods. These methods are time-consuming and destructive, making real-time monitoring of the production line difficult and insufficient to meet the requirements of the modern bamboo product industry for rapid and non-destructive testing. For mold detection in bamboo, manual and machine vision methods are mostly used, but the distribution of mold spots is uncertain, making it easy to miss mold spots. Furthermore, early-stage mold is difficult to identify, leading to resource waste and potential quality issues. While some quality inspection production lines exist, most rely on image detection methods, which cannot simultaneously detect multiple indicators such as moisture content and mold conditions. Additionally, Luo bamboo is typically stored in a bent manner for easy subsequent curling processing; its bending shape differs from most seeds or fruits, making general-purpose testing production lines unsuitable. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a multispectral bamboo quality inspection system that can effectively solve the problems that the current quality assessment of bamboo before processing mainly relies on manual labor and that bamboo bending is not easy to detect.

[0005] The objective of this utility model can be achieved by adopting the following technical solutions:

[0006] A multispectral bamboo quality inspection system includes a frame, a feeding unit, a light source unit, and a multispectral camera unit. The frame is equipped with a dark box structure to shield against external light interference. The feeding unit is mounted on the frame and located inside the dark box structure, with an image acquisition area on it for segmented feeding of bamboo to the image acquisition area, ensuring the bamboo remains straight during feeding. The light source unit is mounted on the frame, located inside the dark box structure and above the feeding unit, for providing light to the bamboo segments fed to the image acquisition area. The multispectral camera unit is mounted on the frame, located at the top center of the dark box structure and directly above the image acquisition area, for acquiring image information of the bamboo segments fed to the image acquisition area in different wavelengths, thereby obtaining multispectral data of the bamboo.

[0007] Furthermore, the feeding unit includes a conveyor belt and a constraint structure. The conveyor belt is mounted on the frame and located inside the dark box structure. An image acquisition area is set at its center. The conveyor belt is driven by a motor to rotate and transport bamboo materials to the image acquisition area in segments. The constraint structure is installed above the conveyor belt and maintains a gap with the conveyor belt to accommodate the bamboo materials and ensure that the bamboo materials remain straight during transportation. A rectangular acquisition window is set at the position corresponding to the image acquisition area on the constraint structure. The rectangular acquisition window is equipped with quartz glass to facilitate light transmission and image acquisition.

[0008] Furthermore, the feed inlet of the conveyor belt is equipped with a rubber roller structure to reduce the friction when feeding bamboo.

[0009] Furthermore, the light source unit includes multiple halogen tungsten lamps capable of covering a wide spectral band. The multiple halogen tungsten lamps are evenly distributed circumferentially on the frame and illuminate the center of the image acquisition area at a 45° angle.

[0010] Furthermore, a centrifugal fan for active heat dissipation is provided on the frame and above each halogen tungsten lamp.

[0011] Furthermore, the halogen tungsten lamp is fixed to the frame by a high-temperature resistant aluminum alloy bracket.

[0012] Furthermore, the multispectral camera unit includes an axle, a camera, a camera bracket, a filter wheel with an outer grooved wheel structure, a stepper motor, a motor bracket, and multiple filters of different wavelengths. The top of the axle is mounted on the frame, and the filter wheel with the outer grooved wheel structure is mounted on the bottom of the axle via bearings. Multiple filters of different wavelengths are mounted on the filter wheel in a circular array. The camera is mounted on the frame via the camera bracket and is located above the filter wheel. The stepper motor is mounted on the frame via the motor bracket. The stepper motor drives the outer grooved wheel structure and drives the filter wheel to rotate sequentially in a predetermined order, so that each filter rotates sequentially to below the camera, thereby acquiring image information of bamboo segments at different wavelengths through the camera.

[0013] Furthermore, the upper interior of the dark box structure is provided with multiple inclined aluminum plates for auxiliary heat dissipation.

[0014] Furthermore, the inner surface of the inclined aluminum plate is coated with a high-temperature resistant black coating.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] 1. The detection system of this utility model can realize real-time dynamic, rapid and non-destructive detection of the quality of curled, flat and slender bamboo materials. It can be applied to general-purpose detection production lines and greatly improve the efficiency of bamboo material quality detection.

[0017] 2. The detection system of this utility model can acquire multispectral image information by using filters of different wavelengths, and realize the simultaneous detection of bamboo moisture content and mold condition.

[0018] 3. The detection system of this utility model can complete the detection of other quality parameters by changing the filters with different band combinations, which is highly flexible, widely applicable and practical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the detection system of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the detection system of this utility model.

[0021] Figure 3 This is a schematic diagram of the feeding unit of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the multispectral camera unit of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0024] like Figures 1 to 2As shown, this embodiment provides a multispectral bamboo quality inspection system, including a frame 1, a feeding unit 3, a light source unit 4, and a multispectral camera unit 5. A dark box structure 2 is installed on the frame 1 to shield against external light interference, ensuring stable and reliable acquisition of spectral images. The feeding unit 3 is located on the frame 1 inside the dark box structure 2, and has an image acquisition area for segmented bamboo feeding to the image acquisition area, ensuring the bamboo remains straight during feeding. The feeding unit 3 can accurately stop within the time interval of information acquisition and can move forward stably after acquisition, allowing the next segment to be inspected to reach the acquisition position. The light source unit 4 is located on the frame 1 inside the dark box structure 2 and above the feeding unit 3, providing light to the bamboo segments fed to the image acquisition area. The multispectral camera unit 5 is located on the frame 1 at the top center of the dark box structure 2, directly above the image acquisition area, acquiring image information of the bamboo segments fed to the image acquisition area in different wavelengths, thereby obtaining multispectral data of the bamboo segments for bamboo quality analysis.

[0025] like Figure 3 As shown, the feeding unit 3 includes a conveyor belt 301 and a constraint structure 302. The conveyor belt 301 is mounted on the frame 1 and located inside the dark box structure 2. An image acquisition area is set at its center. Its motor has intermittent operation capability, and the motor 305 drives the conveyor belt 301 to rotate intermittently and can stop precisely within a set interval to facilitate the image acquisition of bamboo. At the same time, after each image acquisition, the conveyor belt 301 allows the next segment to move stably to the image acquisition area. The constraint structure 302 is installed above the conveyor belt 301 and maintains a gap with the conveyor belt 301 to accommodate bamboo. The material is transported to ensure that the bamboo remains straight and to reduce any possible shifts or shaking during transport. The position of the constraint structure can be adjusted up and down according to actual needs. By adjusting the gap between the two, stable transport can be achieved. A rectangular acquisition window 303 is set on the constraint structure 302 at the position corresponding to the image acquisition area. A quartz glass 304 is set at the rectangular acquisition window 303. The quartz glass 304 has good optical transmittance, which on the one hand allows the multispectral camera unit 5 to acquire bamboo information through the rectangular acquisition window 303, and on the other hand ensures that the bamboo can pass smoothly through the rectangular acquisition window 303.

[0026] To reduce friction during bamboo feeding, a rubber roller structure 306 is provided at the feed inlet of the conveyor belt 301. The rubber roller structure 306 can be fixed to the end of the constraint structure 302.

[0027] The light source unit 4 includes multiple halogen lamps 401 capable of covering a wide spectral band. These lamps are evenly distributed circumferentially on the frame 1, illuminating the center of the image acquisition area at a 45° angle. The halogen lamps 401 are fixed to the frame 1 by high-temperature resistant aluminum alloy brackets 402 to prevent thermal damage to the system during high-temperature operation. Centrifugal fans 403 are also installed on the frame 1, above each halogen lamp 401, for active cooling.

[0028] like Figure 4 As shown, the multispectral camera unit 5 includes an axle 501, a camera 502, a camera bracket 503, a filter wheel 504 with an outer grooved wheel structure 505, a stepper motor 506, a motor bracket 507, and multiple filters 508 of different wavelengths. The top of the axle 501 is mounted on the frame 1, and the filter wheel 504 with the outer grooved wheel structure is mounted on the bottom of the axle 501 via bearings. Multiple filters 508 of different wavelengths are mounted on the filter wheel 504 in a ring array. The camera 502... The camera is mounted on the frame 1 via a camera bracket 503 and positioned above the filter wheel 504. A stepper motor 506 is mounted on the frame 1 via a motor bracket 507. The stepper motor 506 drives the outer grooved wheel structure 505 and causes the filter wheel 504 to rotate sequentially in a predetermined order. This causes each filter 508 to rotate sequentially to a position below the camera 502. The camera 502 then collects image information of bamboo segments at different wavelengths. After completing one cycle of rotation, complete multispectral data can be obtained.

[0029] Except for the necessary bamboo inlet and outlet, the surrounding parts of the dark box structure 2 are sealed as much as possible to reduce ambient light interference. Multiple inclined aluminum plates 201 are installed on the upper part of the interior to assist in heat dissipation, which can effectively improve the heat dissipation efficiency of the light source. The inner surface of the inclined aluminum plates is coated with a high-temperature resistant black coating.

[0030] The specific usage method of the detection system in this embodiment is as follows:

[0031] Before starting work, turn on the light source unit, multispectral camera unit and conveyor belt to preheat the system;

[0032] After the light and the conveyor belt movement have stabilized, place the bamboo at the entrance of the conveyor belt. The bamboo is fed by the rubber roller structure. The constraint structure flattens the curled bamboo to ensure that the bamboo is straight during the conveying process and to reduce the possible deviation or shaking of the bamboo.

[0033] Once the bamboo enters the rectangular acquisition window, the conveyor belt stops moving. The stepper motor drives the outer grooved wheel structure and drives the filter wheel to rotate in a predetermined order, so that each filter rotates to the bottom of the camera in sequence. Then, the camera acquires image information of bamboo segments in different wavelength bands. After completing one cycle of rotation, the complete multispectral data of the segment can be obtained.

[0034] The conveyor belt continues to move, bringing the next segment of bamboo into the rectangular acquisition window. The above operation is repeated to complete the acquisition of image information for that segment.

[0035] This process is repeated until the image information of the entire bamboo is collected.

[0036] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A multispectral bamboo quality testing system, characterized in that: The system includes a frame, a feeding unit, a light source unit, and a multispectral camera unit. The frame has a dark box structure to shield against external light interference. The feeding unit is located on the frame inside the dark box structure and has an image acquisition area for segmented bamboo feeding, ensuring the bamboo remains straight during feeding. The light source unit is located on the frame, inside the dark box structure, and above the feeding unit, providing light to the bamboo segments fed to the image acquisition area. The multispectral camera unit is located on the frame at the top center of the dark box structure, directly above the image acquisition area, acquiring image information of the bamboo segments at different wavelengths to obtain multispectral data of the bamboo.

2. The multispectral bamboo quality testing system according to claim 1, characterized in that: The feeding unit includes a conveyor belt and a constraint structure. The conveyor belt is mounted on a frame and located inside the dark box structure. An image acquisition area is set at its center. The conveyor belt is driven by a motor to rotate and transport bamboo materials to the image acquisition area in segments. The constraint structure is installed above the conveyor belt and maintains a gap with the conveyor belt to accommodate the bamboo materials and ensure that the bamboo materials remain straight during transportation. A rectangular acquisition window is set on the constraint structure at a position corresponding to the image acquisition area. The rectangular acquisition window is equipped with quartz glass to facilitate light transmission and image acquisition.

3. The multispectral bamboo quality testing system according to claim 2, characterized in that: The conveyor belt inlet is equipped with a rubber roller structure to reduce friction when feeding bamboo.

4. The multispectral bamboo quality testing system according to claim 1, characterized in that: The light source unit includes multiple halogen lamps capable of covering a wide spectral band. The multiple halogen lamps are evenly distributed on the frame in the circumferential direction and illuminate the center of the image acquisition area at a 45° angle.

5. The multispectral bamboo quality testing system according to claim 4, characterized in that: A centrifugal fan for active heat dissipation is installed on the frame and above each halogen lamp.

6. The multispectral bamboo quality testing system according to claim 4, characterized in that: The halogen tungsten lamp is fixed to the frame by a high-temperature resistant aluminum alloy bracket.

7. The multispectral bamboo quality testing system according to claim 1, characterized in that: The multispectral camera unit includes an axle, a camera, a camera bracket, a filter wheel with an outer grooved wheel structure, a stepper motor, a motor bracket, and multiple filters of different wavelengths. The top of the axle is mounted on a frame, and the filter wheel with the outer grooved wheel structure is mounted on the bottom of the axle via bearings. Multiple filters of different wavelengths are mounted on the filter wheel in a circular array. The camera is mounted on the frame via the camera bracket and is located above the filter wheel. The stepper motor is mounted on the frame via the motor bracket. The stepper motor drives the outer grooved wheel structure and causes the filter wheel to rotate sequentially in a predetermined order, so that each filter rotates sequentially to below the camera, thereby acquiring image information of bamboo segments at different wavelengths through the camera.

8. The multispectral bamboo quality testing system according to claim 1, characterized in that: The upper interior of the dark box structure is equipped with multiple inclined aluminum plates for auxiliary heat dissipation.

9. The multispectral bamboo quality testing system according to claim 8, characterized in that: The inner surface of the inclined aluminum plate is coated with a high-temperature resistant black coating.

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