Wooden board surface gluing defect laser detection device and method

Abstract

The invention discloses a wood board surface gluing defect laser detection device and method, and belongs to the technical field of wood board defect detection. The wood board surface gluing defect laser detection device comprises a detection box body and a truss main body, a transverse moving frame is installed at the upper end of the truss main body, a laser moving frame and a camera moving frame are arranged in the transverse moving frame, and a laser emitter is installed in the laser moving frame; and a high-resolution camera is arranged in the camera moving frame. The problems that an existing surface defect detection device is single in laser detection and measurement mode, adaptive adjustment cannot be conducted, and gluing defect detection work at different positions is affected are solved, multi-directional adjustment work is achieved in a moving opening, the positions of a connecting sleeve plate and the outer side of a detection box are adjusted, and the detection efficiency is improved. And the overall height of the detection box body is adjusted, so that the laser emitter and the high-resolution camera have the three-axis adjustment capability and have the angle adjustment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of wood board defect detection, and in particular to a laser detection device and method for wood board surface glue defects. Background Art

[0002] Wood panels, a key building material widely used in the construction industry, are made by tightly bonding multiple layers of wood veneers using adhesives. Detecting surface adhesive defects is a crucial step in the production of wood panels.

[0003] Chinese patent publication number CN111307825B discloses a method for detecting pit defects on the surface of wood panels, a field of wood inspection. This patent addresses the existing problem of automatic identification of small pit defects on the surface of wood panels. By combining this method with other methods for identifying panel defects, the patent can achieve automatic identification of panel surface defects.

[0004] During actual use, the surface defect detection device of the above patent has a single laser detection and measurement method and cannot be adaptively adjusted, which affects the detection of glue defects in different positions; therefore, it does not meet existing needs. In this regard, we propose a laser detection device and method for glue defects on the surface of wood panels. Summary of the Invention

[0005] The purpose of the present invention is to provide a laser detection device and method for glue defects on the surface of wooden boards, which solves the problem that the surface defect detection device proposed in the above background technology has a single laser detection and measurement method during actual use and cannot be adaptively adjusted, which affects the detection of glue defects in different positions.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a laser detection device for glue coating defects on the surface of a wooden board, comprising a detection box and a truss body, wherein the truss body is mounted on the upper end of the detection box and fixedly connected to the detection box, a conveyor frame is provided at the lower end of the detection box, and a wooden board to be inspected is provided at the upper end of the conveyor frame;

[0007] A transverse moving frame is installed at the upper end of the truss body, and a laser moving frame and a camera moving frame are arranged inside the transverse moving frame. A laser transmitter is installed inside the laser moving frame, and a high-resolution camera is arranged inside the camera moving frame. The high-resolution camera is used to collect light spot images at different heights, record pixel displacement and true height, fit the calibration curve, and perform defect judgment.

[0008] Preferably, connecting sleeves are installed on both sides of the detection box, and a hydraulic cylinder is installed inside the connecting sleeve, and the hydraulic cylinder is used to adjust the height of the upper end of the detection box.

[0009] Preferably, a guide slot is provided inside the conveying frame, the conveying frame is slidably connected to the detection box through the guide slot, and a moving wheel is installed at one end of the conveying frame.

[0010] Preferably, positioning plates are installed on both sides of the upper end of the conveying frame, and a plate pressing plate is provided above the positioning plate, and a sliding frame is passed through the plate pressing plate, and the sliding frame is fixed to the upper end of the positioning plate, and the plate pressing plate and the sliding frame are fixedly connected by a locking bolt, and an adjusting rod is installed at one end of the plate pressing plate, and the adjusting rod passes through the plate pressing plate and is threadedly connected to the plate pressing plate, and a fixed pressure head is provided at the lower end of the adjusting rod, and the position of the plate pressing plate is fixed by rotating the locking bolt, and the adjusting rod is operated after fixing to lower the fixed pressure head to squeeze the side of the wooden plate to be detected, and fix the wooden plate to be detected for laser measurement and detection.

[0011] Preferably, an electrical box is installed on one side of the truss body, and an encoder and an image processing unit are provided inside the electrical box. The electrical box is electrically connected to the laser emitter and the high-resolution camera, and the results are output through the image processing unit. Through the combination of the above technologies, the high-resolution camera can stably capture the laser spot at a fixed production line speed, thereby realizing micron-level online detection of gluing defects in wooden boards.

[0012] Preferably, an integrally formed moving opening is provided inside the truss body, and the transverse moving frame is slidingly connected to the truss body through the moving opening. A servo motor is installed on one side of the upper end of the truss body, and the motor shaft of the servo motor is fixedly connected to a lead screw, which passes through the transverse moving frame and is threadedly connected to the transverse moving frame. When the glue defect laser detection device is in use, the lead screw is driven to rotate by the servo motor, and the lead screw causes the transverse moving frame to move as a whole.

[0013] Preferably, the laser moving frame and the camera moving frame are both engaged and connected with the horizontal moving frame through a slide groove, and a first stepper motor is installed on the outside of the laser moving frame, and a second stepper motor is installed on the outside of the camera moving frame. The first stepper motor and the second stepper motor are both engaged and connected with the truss body through gears and racks. The positions of the laser moving frame and the camera moving frame are adjusted by the first stepper motor and the second stepper motor, and multi-directional adjustment work is realized in the moving port.

[0014] Preferably, an angle adjustment motor is installed on one side of the laser moving frame and the camera moving frame, and the outside of the laser emitter and the high-resolution camera are rotatably connected to the laser moving frame and the camera moving frame respectively through a rotating shaft, and the angle adjustment motor is fixedly connected to the rotating shaft through a coupling, and a brake is provided at one end of the rotating shaft. The rotating shaft is driven to rotate by the angle adjustment motor, and the rotating shaft adjusts the laser emitter and the high-resolution camera inside the laser moving frame and the camera moving frame, so that the laser emission angle of the laser emitter and the shooting angle of the high-resolution camera can be adjusted to adapt to a wide range of detection angles.

[0015] Preferably, a laser projection head is provided at the lower end of the laser transmitter, and a surface adhesive layer is provided on the surface of the wood board to be inspected. The laser beam emitted by the laser projection head refracts reflected light on the surface adhesive layer, and the reflected light forms a light spot at an angle between the surface adhesive layers. An optical lens is provided at the lower end of the high-resolution camera, and the optical lens is used to measure the light spot to determine the size of the difference, collect light spot images at different heights, record pixel displacement and true height, fit the calibration curve, and perform defect judgment.

[0016] The detection method of the laser detection device for the glue coating defect on the surface of the wood board comprises the following steps:

[0017] Step 1: Place the wooden board to be tested on the conveyor rack and fix it according to its position and thickness;

[0018] Step 2: Push the conveyor frame. During the movement of the conveyor frame, the wood board to be inspected is moved to the bottom of the truss body for surface glue defect inspection;

[0019] Step 3: Adjust the positions of the laser moving frame and the camera moving frame, as well as the angles of the laser transmitter and the camera moving frame through the servo motor, the angle adjustment motor, the first stepper motor, and the second stepper motor;

[0020] Step 4: The laser transmitter emits a laser beam through the laser projection head, forming a light spot on the surface adhesive layer. The light spot is recorded by a high-resolution camera and optical lens, and images of the light spots at different heights are collected. The pixel displacement and true height are recorded, and the calibration curve is fitted to perform defect judgment. The results are output through the image processing unit to complete the inspection.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. When the glue coating defect laser detection device of the present invention is in use, the servo motor drives the lead screw to rotate, and the lead screw causes the lateral moving frame to move as a whole. The angle adjustment motor drives the rotating shaft to rotate, and the rotating shaft adjusts the laser transmitter and the high-resolution camera inside the laser moving frame and the camera moving frame, so that the laser emission angle of the laser transmitter and the shooting angle of the high-resolution camera can be adjusted to adapt to a wide range of detection angles. Then, the positions of the laser moving frame and the camera moving frame are adjusted by the first stepper motor and the second stepper motor to realize multi-directional adjustment in the moving port, and the overall height of the detection box is adjusted by adjusting the position of the connecting sleeve and the outside of the detection box, so that the laser transmitter and the high-resolution camera have the ability of three-axis adjustment and the effect of angle adjustment.

[0023] 2. The laser detection device for glue defects of the present invention emits a laser beam through a laser projection head through a laser transmitter to form a light spot on the surface glue layer, which is recorded by a high-resolution camera and an optical lens, and images of the light spots at different heights are collected, the pixel displacement and the actual height are recorded, the calibration curve is fitted, and defect judgment is performed. The results are output through an image processing unit. Through the combination of the above technologies, a high-resolution camera can stably capture the laser spot at a fixed production line speed, thereby realizing micron-level online detection of glue defects in wooden boards, and realizing high-precision and high-stability online detection of glue defects in wooden boards, providing core quality assurance for intelligent manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an axonometric view of the present invention from the front;

[0025] Figure 2 For the present invention Figure 1 A partial enlarged view of area A in the middle;

[0026] Figure 3 For the present invention Figure 1 A partial enlarged view of area B in the middle;

[0027] Figure 4 It is an axonometric view of the present invention from above;

[0028] Figure 5 An axonometric view of the present invention viewed from above;

[0029] Figure 6 Schematic diagram of the detection working principle of the present invention;

[0030] Figure 7 This is a block diagram of the detection system of the present invention.

[0031] In the figure: 1. Detection box; 101. Connecting sleeve; 2. Conveyor frame; 201. Guide slide; 202. Positioning plate; 203. Moving wheel; 204. Plate pressing plate; 205. Sliding frame; 206. Locking bolt; 207. Adjusting rod; 208. Fixed pressure head; 3. Truss body; 301. Electrical box; 302. Moving port; 303. Horizontal moving frame; 304. Servo motor; 305. Lead screw; 4. Laser moving frame; 401. Laser emitter; 402. Angle adjustment motor; 403. First stepper motor; 404. Laser projection head; 405. Reflected light; 5. Camera moving frame; 501. High-resolution camera; 502. Second stepper motor; 503. Optical lens; 504. Light spot; 6. Wooden board to be inspected; 601. Surface adhesive layer. DETAILED DESCRIPTION

[0032] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] Example 1:

[0034] In order to solve the problem that the existing surface defect detection device has a single laser detection and measurement method in actual use, and cannot be adaptively adjusted, which affects the detection of glue defects in different positions, please refer to Figures 1-4 , this embodiment provides the following technical solutions:

[0035] The laser detection device for glue defects on the surface of a wood board of this embodiment includes a detection box 1 and a truss body 3. The truss body 3 is mounted on the upper end of the detection box 1 and fixedly connected to the detection box 1. A conveyor frame 2 is provided at the lower end of the detection box 1, and a wood board 6 to be inspected is provided at the upper end of the conveyor frame 2.

[0036] A transverse moving frame 303 is installed at the upper end of the truss body 3, and a laser moving frame 4 and a camera moving frame 5 are arranged inside the transverse moving frame 303. A laser transmitter 401 is installed inside the laser moving frame 4, and a high-resolution camera 501 is arranged inside the camera moving frame 5.

[0037] Among them, connecting sleeves 101 are installed on both sides of the detection box 1, and a hydraulic cylinder is installed inside the connecting sleeve 101, and the hydraulic cylinder is used to adjust the height of the upper end of the detection box 1. A guide slide 201 is provided inside the conveying frame 2, and the conveying frame 2 is slidingly connected to the detection box 1 through the guide slide 201, and a moving wheel 203 is installed at one end of the conveying frame 2. By adjusting the position of the connecting sleeve 101 and the outside of the detection box 1, the overall height of the detection box 1 is adjusted, so that the laser emitter 401 and the high-resolution camera 501 have the ability of three-axis adjustment and the effect of angle adjustment.

[0038] In addition, positioning plates 202 are installed on both sides of the upper end of the conveying frame 2, and a plate pressing plate 204 is arranged above the positioning plate 202. A sliding frame 205 is passed through the plate pressing plate 204, and the sliding frame 205 is fixed to the upper end of the positioning plate 202, and the plate pressing plate 204 and the sliding frame 205 are fixedly connected by a locking bolt 206. An adjusting rod 207 is installed at one end of the plate pressing plate 204, and the adjusting rod 207 passes through the plate pressing plate 204 and is threadedly connected to the plate pressing plate 204. A fixed pressure head 208 is provided at the lower end of the adjusting rod 207. The position of the plate pressing plate 204 is fixed by rotating the locking bolt 206. After fixing, the adjusting rod 207 is operated to lower the fixed pressure head 208 to squeeze the side of the wooden board 6 to be inspected, and fix the wooden board 6 to be inspected for laser measurement and detection.

[0039] In fact, the interior of the truss body 3 is provided with an integrally formed moving opening 302, and the transverse moving frame 303 is slidingly connected to the truss body 3 through the moving opening 302. A servo motor 304 is installed on one side of the upper end of the truss body 3, and the motor shaft of the servo motor 304 is fixedly connected with a lead screw 305. The lead screw 305 passes through the transverse moving frame 303 and is threadedly connected to the transverse moving frame 303. When the glue defect laser detection device is in use, the lead screw 305 is driven to rotate by the servo motor 304, and the lead screw 305 causes the transverse moving frame 303 to move as a whole.

[0040] It should be noted that the laser moving frame 4 and the camera moving frame 5 are both meshed and connected with the horizontal moving frame 303 through a slide groove, and a first stepper motor 403 is installed on the outside of the laser moving frame 4, and a second stepper motor 502 is installed on the outside of the camera moving frame 5. The first stepper motor 403 and the second stepper motor 502 are both meshed and connected with the truss body 3 through gears and racks. The positions of the laser moving frame 4 and the camera moving frame 5 are adjusted by the first stepper motor 403 and the second stepper motor 502, and multi-directional adjustment work is realized in the moving opening 302.

[0041] Furthermore, an angle adjustment motor 402 is installed on one side of the laser moving frame 4 and the camera moving frame 5. The outside of the laser emitter 401 and the high-resolution camera 501 are rotatably connected to the laser moving frame 4 and the camera moving frame 5 respectively through a rotating shaft, and the angle adjustment motor 402 is fixedly connected to the rotating shaft through a coupling, and a brake is provided at one end of the rotating shaft. The rotating shaft is driven to rotate by the angle adjustment motor 402, and the rotating shaft adjusts the laser emitter 401 and the high-resolution camera 501 inside the laser moving frame 4 and the camera moving frame 5, so that the laser emission angle of the laser emitter 401 and the shooting angle of the high-resolution camera 501 can be adjusted to adapt to a wide range of detection angles.

[0042] Specifically, when the glue coating defect laser detection device is in use, the servo motor 304 drives the lead screw 305 to rotate, and the lead screw 305 causes the horizontal moving frame 303 to move as a whole. The angle adjustment motor 402 drives the rotating shaft to rotate, and the rotating shaft adjusts the laser emitter 401 and the high-resolution camera 501 inside the laser moving frame 4 and the camera moving frame 5, so that the laser emission angle of the laser emitter 401 and the shooting angle of the high-resolution camera 501 are adjusted to adapt to a wide range of detection angles. Then, the position of the laser moving frame 4 and the camera moving frame 5 is adjusted by the first stepper motor 403 and the second stepper motor 502 to realize multi-directional adjustment in the moving port 302, and by adjusting the position of the connecting sleeve 101 and the outside of the detection box 1, the overall height of the detection box 1 is adjusted, so that the laser emitter 401 and the high-resolution camera 501 have the ability of three-axis adjustment and the effect of angle adjustment.

[0043] Example 2:

[0044] In order to solve the problem that the existing surface defect detection device has poor detection effect in actual use, and is affected by environmental factors, resulting in poor detection results and detection accuracy, please refer to Figure 1 、 Figure 4-Figure 6 , this embodiment provides the following technical solutions:

[0045] The laser detection device for glue defects on the surface of a wood board of this embodiment includes a detection box 1 and a truss body 3. The truss body 3 is mounted on the upper end of the detection box 1 and fixedly connected to the detection box 1. A conveyor frame 2 is provided at the lower end of the detection box 1, and a wood board 6 to be inspected is provided at the upper end of the conveyor frame 2.

[0046] A transverse moving frame 303 is installed at the upper end of the truss body 3. A laser moving frame 4 and a camera moving frame 5 are installed inside the transverse moving frame 303. A laser transmitter 401 is installed inside the laser moving frame 4. A high-resolution camera 501 is installed inside the camera moving frame 5. The high-resolution camera 501 collects images of light spots 504 at different heights, records pixel displacement and true height, fits the calibration curve, and performs defect judgment.

[0047] Among them, an electrical box 301 is installed on one side of the truss body 3, and an encoder and an image processing unit are provided inside the electrical box 301. The electrical box 301 is electrically connected to the laser emitter 401 and the high-resolution camera 501, and the results are output through the image processing unit. Through the above-mentioned technical combination, the high-resolution camera 501 can stably capture the laser spot at a fixed production line speed, thereby realizing micron-level online detection of glue defects in wood boards.

[0048] It should be noted that a laser projection head 404 is provided at the lower end of the laser emitter 401, and a surface adhesive layer 601 is provided on the surface of the wooden board 6 to be inspected. The laser beam emitted by the laser projection head 404 refracts a reflected light 405 on the surface adhesive layer 601, and the reflected light 405 forms a light spot 504 at an angle between the surface adhesive layers 601. An optical lens 503 is provided at the lower end of the high-resolution camera 501. The optical lens 503 is used to measure the light spot 504 to determine the size of the difference, collect images of the light spot 504 at different heights, record pixel displacement and true height, fit the calibration curve, and perform defect judgment.

[0049] See also Figure 7 The detection method of the laser detection device for the glue coating defect on the surface of the wood board comprises the following steps:

[0050] Step 1: Place the wooden board 6 to be inspected on the conveyor rack 2 and fix it according to the position and thickness of the wooden board 6 to be inspected;

[0051] Step 2: Push the conveyor rack 2. During the movement of the conveyor rack 2, the wood board 6 to be inspected is moved to the bottom of the truss body 3 for surface glue defect inspection. The motor is installed and adjusted to fix the speed so that the conveying speed of the conveyor rack 2 is fixed.

[0052] Step 3: Adjust the positions of the laser moving frame 4 and the camera moving frame 5, as well as the angles of the laser emitter 401 and the camera moving frame 5, by means of the servo motor 304, the angle adjustment motor 402, the first stepper motor 403 and the second stepper motor 502;

[0053] Step 4: The laser transmitter 401 emits a laser beam through the laser projection head 404, forming a light spot 504 on the surface glue layer 601. The light spot 504 is recorded by the high-resolution camera 501 and the optical lens 503. The images of the light spot 504 at different heights are collected, the pixel displacement and the actual height are recorded, the calibration curve is fitted, and the defect judgment is performed. The result is output through the image processing unit to complete the detection work. This can achieve high-precision and high-stability online detection of glue defects in wooden boards, providing core quality assurance for intelligent manufacturing.

[0054] Specifically, the laser detection device for glue defects emits a laser beam through the laser projection head 404 via the laser emitter 401, forming a light spot 504 on the surface glue layer 601, and records it through the high-resolution camera 501 and the optical lens 503, collects images of the light spot 504 at different heights, records the pixel displacement and the actual height, and performs defect judgment through the PLC fitting calibration curve. The result is output through the image processing unit. Through the above-mentioned technical combination, the high-resolution camera 501 can stably capture the laser spot at a fixed production line speed, realize micron-level online detection of glue defects in wooden boards, and realize high-precision and high-stability online detection of glue defects in wooden boards, providing core quality assurance for intelligent manufacturing.

[0055] Working principle: When in use, place the wooden board 6 to be inspected on the conveying frame 2, fix the position of the board pressure plate 204 by rotating the locking bolt 206, operate the adjusting rod 207 after fixing, lower the fixed pressure head 208 to squeeze the side of the wooden board 6 to be inspected, fix the wooden board 6 to be inspected for laser measurement and inspection, push the conveying frame 2, and during the movement of the conveying frame 2, drive the wooden board 6 to be inspected to move to the bottom of the truss body 3 for surface glue defect detection. When the glue defect laser detection device is in use, the servo motor 304 drives the lead screw 305 to rotate, and the lead screw 305 makes the horizontal moving frame 303 move as a whole, and the angle adjustment motor 402 drives the rotating shaft to rotate. The rotating shaft adjusts the laser emitter 401 and the high-resolution camera 501 inside the laser moving frame 4 and the camera moving frame 5, so that the laser emission angle of the laser emitter 401 and the shooting angle of the high-resolution camera 501 are adjusted. The camera angle can be adjusted to adapt to a wide range of detection angles, and then the positions of the laser moving frame 4 and the camera moving frame 5 are adjusted by the first stepper motor 403 and the second stepper motor 502 to realize multi-directional adjustment in the moving port 302. The glue defect laser detection device emits a laser beam through the laser projection head 404 through the laser emitter 401 to form a light spot 504 on the surface glue layer 601, which is recorded by the high-resolution camera 501 and the optical lens 503. The images of the light spot 504 at different heights are collected, the pixel displacement and the actual height are recorded, the calibration curve is fitted, and the defect judgment is performed. The results are output through the image processing unit. Through the above-mentioned technical combination, the high-resolution camera 501 can stably capture the laser spot at a fixed production line speed, thereby realizing micron-level online detection of glue defects in wood boards, and realizing high-precision and high-stability online detection of glue defects in wood boards, providing core quality assurance for intelligent manufacturing.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A laser detection device for glue defects on the surface of a wood board, comprising a detection box (1) and a truss body (3), characterized in that: The truss body (3) is mounted on the upper end of the detection box (1) and is fixedly connected to the detection box (1); a conveying rack (2) is provided at the lower end of the interior of the detection box (1); and a wooden board (6) to be detected is provided at the upper end of the conveying rack (2); A transverse moving frame (303) is installed at the upper end of the truss body (3), a laser moving frame (4) and a camera moving frame (5) are arranged inside the transverse moving frame (303), a laser transmitter (401) is installed inside the laser moving frame (4), and a high-resolution camera (501) is arranged inside the camera moving frame (5).

2. The laser detection device for glue defects on the surface of wooden boards according to claim 1 is characterized in that: Connecting sleeves (101) are installed on both sides of the detection box (1), and a hydraulic cylinder is installed inside the connecting sleeve (101), and the hydraulic cylinder is used to adjust the height of the upper end of the detection box (1).

3. The laser detection device for glue defects on the surface of wooden boards according to claim 1 is characterized in that: A guide slot (201) is provided inside the conveying frame (2), the conveying frame (2) is slidably connected to the detection box (1) via the guide slot (201), and a moving wheel (203) is installed at one end of the conveying frame (2).

4. The laser detection device for glue defects on the surface of wooden boards according to claim 1 is characterized in that: Positioning plates (202) are installed on both sides of the upper end of the conveying frame (2), and a plate pressing plate (204) is arranged above the positioning plate (202). A sliding frame (205) is passed through the plate pressing plate (204), and the sliding frame (205) is fixed to the upper end of the positioning plate (202). The plate pressing plate (204) and the sliding frame (205) are fixedly connected by a locking bolt (206). An adjusting rod (207) is installed at one end of the plate pressing plate (204), and the adjusting rod (207) passes through the plate pressing plate (204) and is threadedly connected to the plate pressing plate (204). The lower end of the adjusting rod (207) is provided with a fixed pressure head (208).

5. The laser detection device for glue defects on the surface of wooden boards according to claim 1 is characterized in that: An electrical box (301) is installed on one side of the truss body (3), an encoder and an image processing unit are provided inside the electrical box (301), and the electrical box (301) is electrically connected to a laser transmitter (401) and a high-resolution camera (501).

6. The laser detection device for glue defects on the surface of wooden boards according to claim 5, characterized in that: An integrally formed moving opening (302) is provided inside the truss body (3), and the transverse moving frame (303) is slidably connected to the truss body (3) through the moving opening (302). A servo motor (304) is installed on one side of the upper end of the truss body (3), and a motor shaft of the servo motor (304) is fixedly connected to a lead screw (305), and the lead screw (305) passes through the transverse moving frame (303) and is threadedly connected to the transverse moving frame (303).

7. The laser detection device for glue defects on the surface of wooden boards according to claim 5, characterized in that: The laser moving frame (4) and the camera moving frame (5) are both meshed and connected with the transverse moving frame (303) through a slide groove, and a first stepper motor (403) is installed on the outside of the laser moving frame (4), and a second stepper motor (502) is installed on the outside of the camera moving frame (5). The first stepper motor (403) and the second stepper motor (502) are both meshed and connected with the truss body (3) through a gear and a rack.

8. The laser detection device for glue defects on the surface of wooden boards according to claim 7, characterized in that: An angle adjustment motor (402) is installed on one side of the laser moving frame (4) and the camera moving frame (5); the exteriors of the laser emitter (401) and the high-resolution camera (501) are rotatably connected to the laser moving frame (4) and the camera moving frame (5) respectively via rotating shafts; the angle adjustment motor (402) is fixedly connected to the rotating shaft via a coupling; and a brake is provided at one end of the rotating shaft.

9. The laser detection device for glue defects on the surface of wooden boards according to claim 8, characterized in that: A laser projection head (404) is provided at the lower end of the laser emitter (401); a surface adhesive layer (601) is provided on the surface of the wood board (6) to be detected; the laser beam emitted by the laser projection head (404) refracts on the surface adhesive layer (601) to produce reflected light (405); the reflected light (405) forms a light spot (504) at an angle between the surface adhesive layer (601); an optical lens (503) is provided at the lower end of the high-resolution camera (501); the optical lens (503) is used to measure the light spot (504) and determine the size of the difference.

10. The detection method of the laser detection device for detecting glue defects on the surface of wooden boards according to claim 9, characterized in that: The steps include: Step 1: Place the wooden board (6) to be inspected on the conveyor frame (2), and fix it according to the position and thickness of the wooden board (6); Step 2: Push the conveyor frame (2). During the movement of the conveyor frame (2), the wooden board (6) to be inspected is driven to move to the bottom of the truss body (3) to perform surface glue defect inspection; Step 3: Adjust the positions of the laser moving frame (4) and the camera moving frame (5), as well as the angles of the laser transmitter (401) and the camera moving frame (5) by means of the servo motor (304), the angle adjustment motor (402), the first stepper motor (403) and the second stepper motor (502); Step 4: The laser emitter (401) emits a laser beam through the laser projection head (404), forming a light spot (504) on the surface adhesive layer (601), and records the light spot (504) at different heights through a high-resolution camera (501) and an optical lens (503). The images of the light spot (504) at different heights are collected, the pixel displacement and the actual height are recorded, the calibration curve is fitted, and the defect determination is performed. The results are output through the image processing unit to complete the detection work.

Images