A veneer grading and sorting system

Abstract

This invention relates to the field of woodworking machinery and provides a veneer grading and screening system, comprising: a third conveyor arranged in a multi-segment configuration, wherein the discharge end of the third conveyor in the transport direction is installed with a profile support in a rotating manner; a stabilizing component one, used to assist in transporting the veneer, is fixedly installed with the profile support and is located above the discharge end of the third conveyor in the transport direction; and a lifting mechanism, the main component for veneer sorting, which mainly includes a steering gear fixedly installed on the profile support, wherein the input end of the steering gear is connected to the drive end of a servo motor, and the servo motor and the steering gear are fixedly connected. By using a servo motor-driven linkage mechanism to lift the conveyor for sorting, the traditional complex actuator is replaced, simplifying the structure, improving accuracy and reliability, and integrating dust removal, correction, and flattening pretreatment functions, achieving full automation and high efficiency in veneer grading and screening.

Description

Technical Field

[0001] This invention relates to the field of woodworking machinery, specifically to a veneer grading and screening system. Background Technology

[0002] As an important raw material for wood products, the surface quality of wood veneer directly affects the appearance and value of the final product. Therefore, accurate grading based on surface defects such as cracks and holes is a crucial step in the wood veneer processing and production process. With the development of automation technology, the use of machine vision systems for automatic detection and grading of wood veneer has become an industry trend, offering significant advantages in efficiency and consistency compared to traditional manual sorting.

[0003] In automated grading processes, after the vision system determines the grade of the veneer, a reliable sorting actuator is needed to physically separate the veneers of different grades according to instructions. Currently, the actuators commonly used in the industry are pneumatic push rods, tilting baffles, or complex multi-stage conveying and diversion devices.

[0004] However, these existing sorting mechanisms have revealed some problems in practical applications. For example, while pneumatic push rod mechanisms have a fast response speed, their operation is impactful and may cause secondary damage to thin and brittle veneer. On the other hand, schemes using tilting baffles or multi-stage conveying and diversion often have complex mechanical structures, containing numerous transmission components and kinematic pairs. This not only increases the manufacturing cost and maintenance difficulty of the equipment, but more importantly, the numerous moving parts also mean more potential failure points, thus affecting the long-term operational stability of the entire grading system and the reliability of the sorting action. Therefore, this invention proposes a veneer grading and screening system to address the shortcomings of existing technologies. Summary of the Invention

[0005] In view of the problems of low operational reliability caused by the complex structure of the sorting execution mechanism and the large number of moving parts in the existing wood veneer grading and screening system, the present invention provides a wood veneer grading and screening system with an improved structure that can effectively solve the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a veneer grading and screening system, comprising: A third conveyor with a multi-segment arrangement is used, wherein the discharge end of the third conveyor in the transport direction is installed with the profile support by rotating. As a stabilizing component to assist in the transportation of wood veneer, it is installed in a fixed manner with the profile support, and the stabilizing component is located above the discharge end of the third conveyor in the transportation direction; The lifting mechanism, a key component for veneer sorting, mainly includes a steering gear fixedly mounted on a profile support. The input end of the steering gear is connected to the drive end of a servo motor, and the servo motor is also fixedly connected to the steering gear. A rotating rod is fixedly connected to the output end of the steering gear. Connecting profiles are fixedly connected to both sides of the outer wall of the rotating rod. The bottom of the connecting profile rotates at one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the feed end of the third conveyor to lift the third conveyor.

[0007] Preferably, a chain conveyor is provided directly below the third conveyor, and the chain conveyor is used to hold the sorted veneer. The holding carrier is a pallet, which facilitates batch transfer.

[0008] Preferably, the second conveyor for positioning and conveying wood veneer adopts a multi-segment arrangement. Positioning strips are fixedly connected to both sides of the conveyor belt of the second conveyor. The positioning strips are wavy in shape and are used to correct and straighten the wood veneer during the conveying process.

[0009] Preferably, there are two roller conveyors for feeding wood veneer. One is arranged on the ground in a platform manner, and the other is arranged in a suspended manner and is driven to lift by a lifting component to realize the transportation and docking of wood veneer.

[0010] Preferably, the lifting assembly includes a second servo motor mounted on the profile support, and the drive end of the second servo motor is connected to a suspended roller conveyor via a chain and sprocket assembly to achieve lifting.

[0011] Preferably, the dust collection component for removing dust from wood veneer is located at the top of the first conveyor. The dust collection component mainly includes a blower as a power source. The input end of the blower is connected to one end of a connecting pipe, and the other end of the blower is connected to a dust collection channel. The dust collection channel has two dust collection ports, which are located on both sides of the first conveyor respectively, forming a covered dust collection.

[0012] Preferably, as a second stabilizing component for auxiliary transportation of wood veneer, it is located at the discharge end of the second conveyor in the leftmost direction of transportation. The second stabilizing component mainly includes a pressure roller that contacts the wood veneer. Support frames are installed at both ends of the pressure roller, and the top of the support frame is installed on the profile support through a damper.

[0013] Preferably, the stabilizing component one and the stabilizing component two have the same structure.

[0014] Preferably, the vision module for detecting wood veneer mainly includes: The visual inspection unit is used to acquire images of the wood veneer surface, identify defects and determine their grade, and output grade control signals. It includes an industrial image acquisition device, an image processing device, a defect identification module and a grade output module. The defect identification module can identify cracks and holes on the wood veneer surface, and the grade output module can divide the wood veneer into multiple grades and output corresponding control commands. The sorting execution unit is used to receive the grading signal from the visual inspection unit, and to lift and drop qualified veneer of the same grade, and to convey unqualified veneer directly.

[0015] A method for grading and screening wood veneer includes the following steps: Step 1: Place the wood veneer on the platform-arranged roller conveyor, and transport it to the suspended roller conveyor. After the height is adjusted by the lifting component, it is sent into the first conveyor. Step 2: During the conveying process of the wood veneer on the first conveyor, the dust removal component completes the surface dust removal. Step 3: After dust removal, the wood veneer enters the second conveyor, where it is corrected by the corrugated positioning strip and flattened by the stabilizing component to maintain a flat surface. Step 4: The visual inspection unit acquires images of the wood veneer on the second conveyor, identifies cracks and holes, determines the grade, and outputs a grading control signal. Step 5: The veneer enters the third conveyor, and the stabilizing component assists in stabilizing the conveyor. The sorting execution unit receives the visual grading signal. If it meets the standard of this grade, the third conveyor is raised and the veneer falls into the tray of the chain conveyor below. If it does not meet the standard, it passes directly through the third conveyor and enters the next level sorting station for secondary judgment via the programmable logic controller instruction, thus completing the grading and screening.

[0016] The working principle of the veneer grading and screening system of the present invention is as follows: First, the veneer to be sorted is placed on the roller conveyor arranged on the platform. The veneer is transported to the suspended roller conveyor. At this time, the servo motor in the lifting assembly drives the suspended roller conveyor to adjust to a suitable height through the chain and sprocket assembly, and smoothly feeds the veneer into the first conveyor, completing the feeding step.

[0017] As the wood veneer is conveyed on the first conveyor, the dust collection assembly above it begins to operate. A blower generates negative pressure, sucking away dust and impurities from the veneer surface through suction ports located on both sides of the conveyor belt, thus completing surface cleaning. Subsequently, the dust-removed veneer enters the second conveyor. Wavy positioning strips on both sides of the conveyor belt guide and correct the veneer's deviation, while the second stabilizing assembly at the discharge end uses its pressure rollers to flatten the veneer, ensuring it enters the inspection area in a flat and centered position.

[0018] As the veneer passes through the second conveyor, the vision inspection unit acquires high-speed images of its surface, and the internal defect identification module identifies defects such as cracks and holes. The grading output module completes the grading determination according to the preset standards and generates the corresponding grading control signal, which is sent to the sorting execution unit.

[0019] Upon receiving the signal, the veneer enters the third conveyor, which is assisted and stabilized by the stabilizing component. If the sorting unit determines from the grading signal that the veneer is of the target grade to be screened, the lifting mechanism activates, the servo motor drives the steering gear and rotating rod to rotate, and the feed end of the third conveyor is lifted through the linkage mechanism composed of connecting profiles and connecting rods, causing the veneer to slide off the conveyor belt into the tray of the chain conveyor below. If the veneer is determined not to meet the current grade, the lifting mechanism does not activate, and the veneer is directly conveyed to the discharge end along the third conveyor, thereby achieving automatic separation and screening of veneers of different grades.

[0020] This invention provides a veneer grading and screening system. It has the following beneficial effects: 1. This invention replaces the traditional complex sorting actuators with a flexible lifting conveyor, eliminating rigid pushing and hard impact actions, and completely solving the problem of pneumatic push rods impacting and tearing thin wood veneer. This not only simplifies the overall mechanical structure and reduces potential failure points, but also makes the sorting action more precise and faster, improving the stability of equipment operation and the reliability of sorting actions.

[0021] 2. By setting up a pre-processing procedure in front of the visual inspection station, which includes dust collection, wavy positioning strip correction, and pressure roller flattening, this invention ensures that the veneer enters the image acquisition area in an ideal state that is clean, flat, and centered. The comprehensive pre-processing measures effectively eliminate detection interference and provide a high-quality image basis for subsequent defect identification, thereby significantly improving the accuracy of grading judgment.

[0022] 3. The system of this invention integrates functional modules such as liftable automatic feeding, multi-segment stable conveying, online visual inspection, and automated sorting and unloading into a continuous and smooth operation process. The highly integrated design realizes the full automation of veneer grading and screening, effectively improving production efficiency, reducing reliance on manual operation, and ensuring the uniformity and objectivity of grading standards. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram showing the connection structure between the third conveyor and the lifting mechanism in this invention; Figure 3 This is a schematic diagram of the structure of the second conveyor and the wave positioning strip in this invention; Figure 4 This is a schematic diagram of the structure of the first conveyor and dust collection assembly in this invention; Figure 5 for Figure 2 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram of the structure of the stabilizing component one in this invention; Figure 7 This is a schematic diagram of the structure of the third conveyor after it has been partially lifted in this invention; Figure 8 This is a schematic diagram of the tray structure in this invention.

[0024] in: 1. Lifting mechanism; 101. Servo motor 1; 102. Steering gear; 103. Rotating rod; 104. Connecting profile; 105. Connecting rod; 2. Stabilizing component one; 3. Third conveyor; 4. Chain conveyor; 5. Second conveyor; 6. Stabilizing component two; 601. Damper; 602. Pressure roller; 7. Vacuum cleaning assembly; 701. Connecting duct; 702. Blower; 8. First conveyor; 9. Lifting assembly; 901. Servo motor II; 902. Chain and sprocket assembly; 10. Roller conveyor; 11. Positioning bar; 12. Pallet. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example: Please refer to Figures 1 to 8 This invention provides a veneer grading and screening system, which aims to solve the problem of low screening efficiency caused by the complex structure and insufficient reliability of the veneer sorting execution mechanism in the prior art.

[0027] In this embodiment, poplar veneer with a thickness of 0.6–1.5 mm was selected as the processing raw material. The incoming veneer contained workpieces with defects such as cracks and holes. The whole machine was equipped with an industrial vision camera and a PLC control system. The equipment underwent 72 hours of continuous industrial trial operation, and the measured process data are as follows: like Figure 1 and Figure 2As shown, the veneer grading and screening system is built on a profile support and mainly includes a third conveyor 3 for veneer sorting, a stabilizing component 2 for auxiliary conveying, and a lifting mechanism 1 for driving the third conveyor 3. The third conveyor 3 and the stabilizing component 2 are both mounted on the profile support, and the lifting mechanism 1 drives the third conveyor 3 to achieve veneer grading and feeding.

[0028] The third conveyor 3 adopts a multi-segment arrangement to adapt to the smooth conveying of veneers of different lengths. Its discharge end in the transport direction is connected to the profile support through a rotating shaft. This structure allows the third conveyor 3 to be lifted or lowered as a whole with its discharge end as the fulcrum.

[0029] like Figure 6 As shown, stabilizing component 1 2 is fixedly installed on the profile bracket. Its specific installation position is directly above the discharge end of the third conveyor 3 in the transport direction. It is used to slightly press the wood veneer when it is conveyed to the discharge end to prevent the wood veneer from warping or shifting due to the movement of the conveyor belt, and to ensure the accuracy of the subsequent dropping action. Its structure is the same as that of stabilizing component 2 6 described later.

[0030] The lifting mechanism 1 is the core component for achieving the veneer sorting action, and it is fixedly mounted on the profile support. The lifting mechanism 1 includes a servo motor 101 as a power source, a steering gear 102, a rotating rod 103, connecting profiles 104 on both sides, and connecting rods 105. The servo motor 101 and the steering gear 102 are fixedly connected, and the drive end of the servo motor 101 is connected to the input end of the steering gear 102.

[0031] A rotating rod 103 is fixedly connected to the output end of the steering device 102. Connecting profiles 104 are fixedly connected to both sides of the outer wall of the rotating rod 103 by welding or bolts. The bottom of each connecting profile 104 is rotatably connected to one end of a connecting rod 105 via a pin. The other end of the connecting rod 105 is also rotatably connected to the bottom of the feed end of the third conveyor 3 via a pin.

[0032] In this embodiment, the sorting response time is as follows: the vision module sends a grading signal to the servo lifting mechanism to complete the conveyor lifting action in ≤0.18s, and the total time for a single piece of veneer to be unloaded is ≤0.35s. Compared with the response speed of 0.5 to 0.7s for traditional pneumatic baffle sorting mechanisms, the action response efficiency is significantly improved. With the flexible lifting and unloading via a connecting rod, the secondary damage rate of veneer due to impact and compression during the sorting process is ≤0.35%, while the damage rate of traditional pneumatic pusher sorting is generally 2.2% to 3.6%.

[0033] like Figure 7As shown, the working principle of this structure is as follows: When it is necessary to separate wood veneer of a specific grade, the servo motor 101 starts and drives the steering gear 102. The steering gear 102 drives the rotating rod 103 connected to its output end to rotate. The rotation of the rotating rod 103 then causes the connecting profile 104 fixed to it to swing, and then transmits the motion to the feeding end of the third conveyor 3 through the connecting rod 105. Finally, the feeding end of the third conveyor 3 is lifted and rotated upward around the axis of the discharge end. At this time, the wood veneer on the conveying surface of the third conveyor 3 slides smoothly towards the discharge end along the inclined conveyor belt surface under the combined action of the conveyor belt's traveling force and its own gravity. The stabilizing component 2 above always applies a gentle downward pressure to limit the wood veneer, preventing it from bouncing, flipping, or sliding during the sliding process, and ensuring that the wood veneer maintains a flat posture and slides down at a uniform speed. When the wood veneer slides to the edge of the discharge end of the third conveyor 3, it detaches from the conveyor belt support and falls naturally along a gentle sliding trajectory.

[0034] like Figure 8 As shown, to facilitate the collection of sorted veneer, a chain conveyor 4 is installed directly below the third conveyor 3. The chain conveyor 4 is used to receive and transfer the veneer that falls after being lifted by the third conveyor 3. A pallet 12 is placed on the pallet as a container to facilitate batch processing of the graded veneer. The inside of the pallet 12 is treated with anti-slip and cushioning, the surface is flat, and the edges are provided with low guards. After falling vertically for a short distance, the veneer gently lands on the bearing surface of the pallet 12. The entire falling process is free from hard impacts and strong pushing.

[0035] The feeding section of this veneer grading and screening system includes two roller conveyors 10 and a lifting assembly 9. One roller conveyor 10 is positioned directly on the ground as a platform for easy manual loading, while the other is suspended in the air, its height adjusted by the lifting assembly 9. The lifting assembly 9 includes a servo motor 901 mounted on a profile support. The drive end of the servo motor 901 is connected to the frame of the suspended roller conveyor 10 via a chain and sprocket assembly 902. Driven by the servo motor 901, the chain and sprocket assembly 902 enables the suspended roller conveyor 10 to achieve smooth lifting and lowering motion, precisely aligning with the inlet height of the subsequent first conveyor 8 to complete the veneer feeding.

[0036] After being fed into the first conveyor 8 by the roller conveyor 10, the wood veneer passes through the dust collection assembly 7 located at the top of the first conveyor 8. The dust collection assembly 7 is used to remove dust and impurities from the surface of the wood veneer, ensuring the accuracy of subsequent visual inspection. The dust collection assembly 7 mainly consists of a connecting pipe 701 and a blower 702. The blower 702 serves as the power source, with its input end connected to one end of the connecting pipe 701 and its other end connected to a dust collection channel. This dust collection channel has two suction ports, which are respectively arranged on both sides of the conveyor belt of the first conveyor 8, forming a dust collection area covering the entire width of the wood veneer. This effectively removes surface deposits. Actual measurements show that the residual dust coverage rate on the wood veneer surface after dust removal is <3%, and the probability of visual mis-inspection due to dust stains is ≤0.5%.

[0037] The dust-removed wood veneer is conveyed to the second conveyor 5. The second conveyor 5 is equipped with a second stabilizing component 6 and positioning strips 11 for adjusting the posture of the wood veneer before visual inspection. The second stabilizing component 6 is located at the leftmost end of the second conveyor 5 in the transport direction and mainly consists of a pressure roller 602 that contacts the surface of the wood veneer. Support frames are installed at both ends of the pressure roller 602, and the top of the support frames is flexibly mounted to the profile support via a damper 601. As the wood veneer passes through, the pressure roller 602 flattens the wood veneer under its own weight and the action of the damper 601, eliminating any curling or unevenness. The structures of the first stabilizing component 2 and the second stabilizing component 6 are identical.

[0038] Meanwhile, wavy positioning strips 11 are fixedly connected to both sides of the conveyor belt of the second conveyor 5. When the veneer shifts laterally on the conveyor belt, its edge will contact the wavy positioning strip 11. The contour of the wave will exert a guiding and correcting force on the veneer, restoring it to the center position of the conveyor belt. This ensures that the veneer enters the subsequent inspection and sorting stations in the correct posture. The wavy positioning strip, together with the pressure roller, flattens the veneer, ensuring that the veneer is conveyed in a centered and orderly manner with a pass rate of ≥99.5%, thus preventing inspection failures caused by deviation and warping.

[0039] Based on the above embodiments, the present invention also includes a vision module for automatic detection and grading of wood veneer. This vision module mainly consists of a vision detection unit and a sorting execution unit.

[0040] The visual inspection unit is responsible for online quality inspection of the wood veneer on the second conveyor 5 after posture adjustment. This unit specifically includes an industrial image acquisition device, an image processing device, a defect recognition module, and a grading output module. The industrial image acquisition device, such as an industrial camera, is mounted above the second conveyor 5 to acquire complete images of the wood veneer surface in real time and with high definition.

[0041] The defect identification module is the core algorithm component running within the image processing device. Through image processing algorithms, it automatically identifies and marks the specific location, size, and quantity of defects such as cracks and holes on the veneer surface. The overall defect identification accuracy is ≥99.2%, and the overall veneer grading and sorting accuracy is ≥99.0%. The grading output module, based on the statistical results from the defect identification module and referring to pre-set grading standards, determines each piece of veneer to a specific quality grade, such as Grade 1, Grade 2, or defective, and ultimately outputs a grading control signal corresponding to that grade.

[0042] The sorting execution unit receives the grading control signal output by the vision inspection unit and converts it into specific mechanical actions. In this embodiment, the physical structure of the sorting execution unit is the lifting mechanism 1 described in detail above. When the grading signal received by the sorting execution unit matches the target sorting grade currently set by the system, the veneer is determined to be qualified veneer of this grade. At this time, the lifting mechanism 1 will be triggered to lift and drop the veneer. Conversely, if the received grading signal does not match the current target grade, it is determined to be unqualified veneer. The lifting mechanism 1 will not perform any action, and the veneer will be directly conveyed to the discharge end via the third conveyor 3. It will then enter the next level sorting station for secondary judgment via the programmable logic controller instruction to complete the grading and screening, thereby completing the physical separation of veneers of different grades.

[0043] Actual production parameters of the whole machine: the wood veneer conveying and sorting capacity is 72 pieces / minute, compared with the traditional manual sorting of 32 pieces / minute, the production efficiency is increased by 125%; the equipment can run continuously for 72 hours with an average daily downtime of less than 8 minutes, which is 72% lower than the failure rate of traditional multi-baffle diversion equipment.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A veneer grading and screening system, characterized in that, include: The third conveyor (3) is arranged in a multi-segment configuration. The discharge end of the third conveyor (3) in the transport direction is installed with the profile support by rotating. As a stabilizing component 1 (2) for transporting wood veneer, it is installed in a fixed manner with the profile support. The stabilizing component 1 (2) is located above the discharge end of the third conveyor (3) in the transport direction. The lifting mechanism (1), which is the main component for sorting wood veneer, mainly includes a steering gear (102) fixedly installed on the profile support. The input end of the steering gear (102) is connected to the drive end of the servo motor (101), and the servo motor (101) is fixedly connected to the steering gear (102). The output end of the steering gear (102) is fixedly connected to a rotating rod (103). Both sides of the outer wall of the rotating rod (103) are fixedly connected to connecting profiles (104). The bottom of the connecting profile (104) rotates at one end of the connecting rod (105), and the other end of the connecting rod (105) is rotatably connected to the feed end of the third conveyor (3) to lift the third conveyor (3).

2. The veneer grading and screening system according to claim 1, characterized in that, A chain conveyor (4) is provided directly below the third conveyor (3), and the chain conveyor (4) is used to hold the sorted veneer, and the container for holding it is a pallet (12).

3. The veneer grading and screening system according to claim 1, characterized in that, As a second conveyor (5) for positioning and conveying wood veneer, it adopts a multi-segment arrangement. Positioning strips (11) are fixedly connected to both sides of the conveyor belt of the second conveyor (5). The positioning strips (11) are wavy in shape.

4. The veneer grading and screening system according to claim 1, characterized in that, There are two roller conveyors (10) for feeding wood veneer. One of them is arranged on the ground in a platform manner, and the other is arranged in a suspended manner. They are driven to lift by a lifting component (9) to realize the transportation of wood veneer.

5. A veneer grading and screening system according to claim 4, characterized in that, The lifting assembly (9) includes a second servo motor (901) mounted on a profile support. The drive end of the second servo motor (901) is connected to a suspended roller conveyor (10) via a chain and sprocket assembly (902) to achieve lifting.

6. The veneer grading and screening system according to claim 1, characterized in that, As a dust removal component (7) for removing dust from wood veneer, it is located at the top of the first conveyor (8). The dust removal component (7) mainly includes a blower (702) as a power source. The input end of the blower (702) is connected to one end of the connecting pipe (701), and the other end of the blower (702) is connected to a dust suction channel. The dust suction channel has two dust suction ports, which are located on both sides of the first conveyor (8).

7. The veneer grading and screening system according to claim 3, characterized in that, As a stabilizing component two (6) for auxiliary transportation of wood veneer, it is located at the discharge end of the second conveyor (5) on the far left in the transportation direction. The stabilizing component two (6) mainly includes a pressure roller (602) that contacts the wood veneer. Support frames are installed at both ends of the pressure roller (602), and the top of the support frame is installed on the profile support through a damper (601).

8. A veneer grading and screening system according to claim 7, characterized in that, The stabilizing component one (2) and the stabilizing component two (6) have the same structure.

9. A veneer grading and screening system according to claim 1, characterized in that, As a visual module for inspecting wood veneer, it mainly includes: The visual inspection unit is used to acquire images of the wood veneer surface, identify defects and determine their grade, and output grade control signals. It includes an industrial image acquisition device, an image processing device, a defect identification module and a grade output module. The defect identification module can identify cracks and holes on the wood veneer surface, and the grade output module can divide the wood veneer into multiple grades and output corresponding control commands. The sorting execution unit is used to receive the grading signal from the visual inspection unit, and to lift and drop qualified veneer of the same grade, and to convey unqualified veneer directly.

10. A method for grading and screening wood veneer, using a wood veneer grading and screening system as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Place the wood veneer on the platform-arranged roller conveyor (10) and transport it to the suspended roller conveyor (10). After the height is adjusted by the lifting component (9), it is sent into the first conveyor (8). Step 2: During the conveying process of the wood veneer on the first conveyor (8), the surface dust is removed by the dust collection component (7); Step 3: After dust removal, the wood veneer enters the second conveyor (5), and is corrected by the wavy positioning strip (11) and flattened by the stabilizing component two (6) to maintain a flat surface. Step 4: The visual inspection unit acquires images of the veneer on the second conveyor (5), identifies cracks and holes, determines the grade, and outputs a grade control signal. Step 5: The veneer enters the third conveyor (3), and the stabilizing component 1 (2) assists in stabilizing the conveying. The sorting execution unit receives the visual grading signal. If it meets the standard of this grade, the third conveyor (3) is raised and the veneer falls into the tray (12) of the chain conveyor (4) below. If it does not meet the standard, it passes directly through the third conveyor (3) and enters the next level sorting station for secondary judgment via the programmable logic controller instruction to complete the grading and screening.

Images