Veneer grading device

Abstract

The utility model discloses a veneer grading device which comprises a feeding mechanism, the feeding mechanism comprises a placing table and a carrying assembly, the placing table is used for placing stacked veneers, the carrying assembly is arranged above the placing table and can move in a reciprocating mode in the first direction, and the carrying assembly comprises at least one set of adsorption parts. And each adsorption part can adsorb one wood veneer. And the detection mechanism is located on one side of the first direction of the feeding device, and the detection mechanism is used for detecting the veneers carried by the carrying assembly. The sorting mechanism is located on the side, away from the feeding mechanism, of the detection mechanism in the first direction, the sorting mechanism comprises a plurality of sorting conveying belts which are sequentially distributed in the second direction, and each sorting conveying belt conveys wood veneers in the second direction; the front end of each sorting conveying belt in the conveying direction can swing up and down so as to be in butt joint with the sorting conveying belt adjacent to the front end or form a falling gap with the sorting conveying belt adjacent to the front end. The device can carry out automatic feeding, detection and grading discharging on thin wood veneers.

Description

TECHNICAL FIELD

[0001] The utility model relates to veneer processing equipment technical field especially relates to a veneer grading device. BACKGROUND

[0002] After veneer is processed, needs to carry out visual inspection, and according to the detection result, the grading of veneer is completed. The existing veneer grading device does not meet the requirement of automatic feeding. Because veneer is very thin, the thinnest only has 0.4mm, and has the natural growth's texture fiber gap, the conventional manual placement feeding mode consumes a lot of manpower, and manual placement is easy to cause veneer to incline, causes sensor to not be able to complete sample image shooting and affects grading result. And the common clamping or page turning scheme of automatic feeding is easy to cause veneer to be damaged, and it is also easy to feed two veneers simultaneously, so the existing veneer grading equipment is mostly to rely on manual sample placement to the conveying belt to solve the feeding problem, but this still needs a lot of manual participation. At the same time, because veneer has deviated during transmission, will cause the irregularity of the drop when sorting. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the utility model is to provide a veneer grading device, which can automatically feed, detect and grade the veneer with thin thickness.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme of a veneer grading device, comprising:

[0005] A feeding mechanism, the feeding mechanism includes a placing table and a carrying assembly, the placing table is used for placing stacked veneers, the carrying assembly is arranged above the placing table and can move back and forth along a first direction, the carrying assembly includes at least one set of adsorption parts, each adsorption part can adsorb a veneer;

[0006] A detection mechanism, the detection mechanism is located on one side of the feeding device in the first direction, and the detection mechanism is used for detecting the veneer carried by the carrying assembly;

[0007] A sorting mechanism, the sorting mechanism is located on the side of the detection mechanism away from the feeding mechanism in the first direction, and the sorting mechanism includes a plurality of sorting conveyors distributed in sequence along a second direction, each sorting conveyor conveys the veneer along the second direction, and the front end of each sorting conveyor along its transmission direction can swing up and down to butt joint with the sorting conveyor adjacent to the front end or form a falling gap.

[0008] The utility model has the advantages of:

[0009] The automatic feeding, detection and grading of the veneer are realized. The feeding mechanism adopts the adsorption mode to adsorb the veneer, realizes the automatic feeding, can realize the safe and reliable feeding of the veneer, and prevents damage. The multiple adsorption parts can realize the simultaneous feeding of multiple veneers, simultaneously feed multiple veneers, and improve the efficiency. The sorting mechanism adopts the scheme of the tiltable sorting conveyor belt for discharging, controls the veneer of different levels to be discharged through multiple sorting conveyor belts, and realizes the grading of the veneer.

[0010] Further, the adsorption part comprises multiple vacuum nozzles arranged in sequence along the second direction, and the vacuum nozzles are respectively movable along the third direction to approach or move away from the veneer.

[0011] The multiple vacuum nozzles adsorb different positions of the veneer, and provide stable support for one veneer. Meanwhile, each vacuum nozzle can be lifted under the drive of the corresponding first lifting drive, and when one veneer is adsorbed, the vacuum nozzle on one side in the Y direction is moved upward, so as to generate a vacuum angle between the uppermost veneer and the veneer below, and prevent the veneer from sticking.

[0012] Further, the feeding mechanism further comprises a rotating device, a lifting device and a first visual detection device, the lifting device is connected with the rotating device and is used to drive the rotating device to move along the third direction, the rotating device is connected with the placing table and drives the placing table to rotate in the horizontal plane, and the first visual detection device is located above the rotating table and is used to take a photo of the uppermost veneer on the placing table.

[0013] Because the veneer is stacked on the placing table in the form of alternation in the transverse direction and the longitudinal direction, the cross stacking can prevent the veneer from falling, but the carrying assembly can only carry the veneer in the longitudinal direction, so when the veneer stacked in the transverse direction needs to be fed, the veneer needs to be rotated by 90° through the rotating device, and then the subsequent veneer carrying is carried out. The first visual detection device is used to detect the direction of the veneer, and the first visual detection direction is linked with the rotating device. The lifting height of the placing table can facilitate the carrying assembly to continue to take the veneer.

[0014] Further, the detection device comprises a first conveying belt for conveying the veneer along the first direction, the first conveying belt is fixed with a second visual detection device and a strip-shaped light source, the strip-shaped light source is arranged along the second direction, and the second visual detection device is located directly above the strip-shaped light source. After the strip-shaped light source is lighted, the second visual detection device is used to obtain a clear color image of the veneer and transmit it to the controller, so as to obtain the grading result of the veneer in the controller.

[0015] Further, two first compression rollers are arranged on both sides of the first direction of the strip-shaped light source respectively, the first compression rollers can rotate along their own axes, and a channel for the veneer to pass through is formed between the first compression rollers and the first conveying belt. The two compression rollers prevent the veneer from being raised when the veneer is imaged, so that the product is in the depth of field of the camera, and the imaging effect is ensured to be clear.

[0016] Further, the sorting mechanism further comprises a material collecting cabin arranged below and corresponding to the sorting conveying belt, and the material collecting cabin is used for collecting the veneer falling from the falling gap or the last section of the sorting conveying belt. The graded veneer is collected by the material collecting cabin.

[0017] Further, the sorting mechanism further comprises a material pushing device arranged on one side of the first direction of the sorting track, and the material pushing device is used for pushing the veneer in the material collecting cabin out. The material pushing device is used for rapid discharging and collecting of the veneer.

[0018] Further, a detection optical fiber is fixed in each material collecting cabin, and the detection optical fiber is linked with an oscillation driving part for driving the corresponding sorting conveying belt to oscillate.

[0019] Further, a direction changing mechanism is arranged between the sorting mechanism and the detection mechanism, the direction changing mechanism comprises a second conveying belt, a third conveying belt and a turning conveying part, the second conveying belt is butted with the first conveying belt and has the same conveying direction, the third conveying belt is butted with one of the sorting conveying belts close to the feeding mechanism and has the same conveying direction, the turning conveying part is arranged between the second conveying belt and the third conveying belt, and the turning conveying part is used for turning the veneer conveyed by the first conveying belt. The sorting device realizes turning of the veneer, changes the longitudinal transmission of the veneer into the transverse transmission, and improves the stability of discharging.

[0020] Further, the turning conveying part comprises a fourth conveying belt, the fourth conveying belt conveys the veneer along a second direction, the fourth conveying belt is provided with a plurality of letting channels, a liftable turning roller is arranged at each letting channel, all the turning rollers extend along the second direction and can synchronously rotate along their own axes. The turning rollers switch the veneer between the turning rollers and the fourth conveying belt with different transmission directions in the lifting process, and realize turning of the veneer. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a top view of the embodiment of the utility model;

[0022] Figure 2 It is a three-dimensional structure schematic view of the feeding mechanism in the embodiment of the utility model;

[0023] Figure 3Another angle perspective structural schematic view of the feeding mechanism in the embodiment of the utility model;

[0024] Figure 4 Structure schematic view of the carrying assembly in the embodiment of the utility model;

[0025] Figure 5 Perspective structural schematic view of the detection mechanism in the embodiment of the utility model;

[0026] Figure 6 Perspective structural schematic view of the turning conveying part in the embodiment of the utility model;

[0027] Figure 7 Perspective structural schematic view of the sorting mechanism in the embodiment of the utility model;

[0028] Figure 8 Butt joint schematic view of the sorting conveying belt horizontal state in the embodiment of the utility model.

[0029] In the drawing,

[0030] 1, feeding mechanism;

[0031] 11, placing table; 12, carrying assembly; 121, vacuum suction nozzle; 122, first lifting driving part; 123, fixed plate; 124, first linear module; 125, second lifting driving part; 126, lifting plate; 13, rotating device; 131, gear; 132, rack; 133, rotating driving part; 134, guide block; 14, lifting device; 15, first visual detection device; 16, first stand;

[0032] 2, detection mechanism;

[0033] 21, first conveying belt; 22, second visual detection device; 23, strip light source; 24, first compression roller;

[0034] 3, sorting mechanism;

[0035] 31, sorting conveying belt; 311, falling gap; 32, material receiving cabin; 33, second stand; 34, material pushing device;

[0036] 4, turning mechanism;

[0037] 41, second conveying belt; 42, third conveying belt; 43, turning conveying part; 431, fourth conveying belt; 432, turning roller; 433, detection part; 434, second compression roller. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0039] Example

[0040] See attached Figure 1 As shown, a veneer grading device of the present invention includes a feeding mechanism 1, a detection mechanism 2 and a sorting mechanism 3. The feeding mechanism 1 realizes automatic loading of veneer and sends it to the detection mechanism 2 for detection. After the detection is completed, the veneer is sent to the sorting mechanism 3 for veneer grading, that is, veneers of different grades are placed in different positions.

[0041] See attached Figure 2 As shown, the loading mechanism 1 includes a placement table 11 and a conveying assembly 12. The placement table 11 is used to place stacked veneers. The conveying assembly 12 is arranged above the placement table 11 and can move back and forth along a first direction. The conveying assembly 12 includes at least one group of adsorption parts, each of which can adsorb a piece of veneer.

[0042] In this embodiment, the feeding mechanism 1 absorbs the veneer using suction components and then moves as a whole in a first direction (Y-direction) to place the veneer onto the detection mechanism 2. In this embodiment, multiple sets of suction components can absorb multiple sheets of veneer, improving feeding efficiency. Furthermore, because the veneer is secured by suction, damage to the veneer is significantly reduced compared to conventional clamping or flipping methods, and thinner veneers can be fed.

[0043] The detection mechanism 2 is located on one side of the first direction of the feeding device, and is used to detect the veneer transported by the transport assembly 12 .

[0044] The sorting mechanism 3 is located on the side of the detection mechanism 2 that is away from the feeding mechanism 1 in the first direction. Figure 7 and attached Figure 8 As shown, the sorting mechanism 3 includes a plurality of sorting conveyor belts 31 distributed in sequence along the second direction (X direction). Each sorting conveyor belt 31 conveys veneer along the second direction. The front end of each sorting conveyor belt 31 along its transmission direction can swing up and down to dock with the sorting conveyor belt 31 adjacent to the front end or form a falling gap 311.

[0045] After the veneer is transported to the sorting conveyor belt 31, the sorting conveyor belt 31 is a multi-section structure. Figure 7 As shown, when the sorting conveyor belt 31 tilts downward, the inertia of the veneer movement is utilized to realize the discharge of the veneer from the falling gap 311. Figure 8As shown, when the sorting conveyor belt 31 swings upward to be parallel to the horizontal plane, it docks with the sorting conveyor belt 31 adjacent to the front end, and the veneer is conveyed to the sorting conveyor belt 31 adjacent to the front end. By using this structure of multiple sorting conveyor belts 31, the inspected veneer can be conveyed to different locations to achieve veneer sorting.

[0046] The veneer grading device in this embodiment enables automatic loading, inspection, and grading of veneer. The loading mechanism 1 uses suction to hold the veneer, enabling automated loading. This ensures safe and reliable loading of the veneer, preventing damage. Multiple suction sections allow for simultaneous loading of multiple sheets of veneer, improving efficiency. The sorting mechanism 3 utilizes a tiltable sorting conveyor belt 31 for unloading, controlling the discharge of veneer of different grades via multiple sorting conveyor belts 31 to achieve veneer grading.

[0047] See attached Figure 4 As shown, each suction unit includes multiple vacuum nozzles 121 arranged sequentially along the Y-direction. These nozzles 121 can be moved in a third direction (Z-direction) to move closer to or further away from the veneer. Multiple vacuum nozzles 121 suction different locations on the veneer, providing stable support for each piece of veneer. Each vacuum nozzle 121 can be independently raised and lowered by its corresponding first lifting drive 122. Once a piece of veneer has been suctioned, a vacuum nozzle 121 positioned to one side in the Y-direction can be moved upward. This creates a vacuum angle between the topmost piece of veneer and the underlying piece, preventing the veneers from sticking.

[0048] In one embodiment, the spacing between the vacuum nozzles 121 in one adsorption unit is adjustable so as to be applicable to veneers of different sizes. Figure 4 As shown, the spacing adjustment method is to open a waist-shaped hole extending along the Y direction on the fixing plate 123 for fixing the vacuum suction nozzle 121. The vacuum suction nozzle 121 is fixed in the waist-shaped hole by a fixing part, and the spacing between the vacuum suction nozzles 121 is adjusted by adjusting the position of the fixing part in the waist-shaped hole.

[0049] See attached Figure 4 As shown, the transport assembly 12 also includes a first linear module 124 and a second lift drive 125. The second lift drive 125 is fixed to the output end of the linear module and is driven by the linear module to reciprocate in a first direction. A lift plate 126 is fixed to the output end of the second lift drive 125, and all first lift drives 122 are fixed to the lift plate 126.

[0050] At this time, the carrying assembly 12 carries the wood veneer, the lifting plate 126 is moved to the upper side of the placing table 11 by the first linear module 124, and then the second lifting driving element 125 drives the suction assembly to move downward, at this time, all the suction parts move downward synchronously to the corresponding wood veneer. After the wood veneer is sucked, the second lifting driving element 125 drives the lifting plate 126 to move upward, the sucked wood veneer is separated from the wood veneer on the placing table 11, and then the first linear module 124 drives the wood veneer to move along the Y direction to the upper side of the detection mechanism 2, and the wood veneer is placed on the detection mechanism 2.

[0051] The linear module is a commonly used screw and nut structure, which will not be described here.

[0052] Referring to FIG. 1, Figure 2 The feeding mechanism 1 further comprises a rotating device 13, a lifting device 14 and a first visual detection device 15. The lifting device 14 is connected with the rotating device 13 and is used to drive the rotating device 13 to move along the third direction (Z direction). The rotating device 13 is connected with the placing table 11 and is used to drive the placing table 11 to rotate in the horizontal plane. The first visual detection device 15 is located above the rotating table and is used to take a photo of the uppermost wood veneer on the placing table 11.

[0053] Because the wood veneer is stacked on the placing table 11 in the form of alternation of the transverse direction and the longitudinal direction, the cross stacking can prevent the wood veneer from falling, but the carrying assembly 12 can only carry the wood veneer in the longitudinal direction. Therefore, when the wood veneer stacked in the transverse direction needs to be fed, the wood veneer needs to be rotated by 90° through the rotating device 13, so that the subsequent wood veneer carrying can be carried out. The first visual detection device 15 is used to detect the direction of the wood veneer, and the first visual detection direction is linked with the rotating device 13. The lifting height of the placing table 11 can facilitate the carrying assembly 12 to continue to take the wood veneer.

[0054] The lifting device 14 comprises a second linear module and a lifting table which is lifted under the driving of the second linear module. The placing table 11 is rotationally connected with the lifting table. The first lifting module and the second lifting module are both fixed on a first stand 16.

[0055] Referring to FIG. 1, Figure 3 The rotating device 13 is arranged on the lifting table. The rotating device 13 comprises a gear 131, a rack 132 and a rotating driving element 133. The gear 131 is rotationally connected with the lifting table and is fixed with the placing table 11. The rack 132 is engaged with the gear 131 and can move along a straight line reciprocatingly under the driving of the rotating driving element 133. When the rotating driving element 133 drives the rack 132 to move, the gear 131 and the placing table 11 can be synchronously rotated.

[0056] The placing table 11 is further provided with a guide block 134. The guide block 134 guides the movement of the rack 132 and can limit the movement distance of the rack 132, so as to limit the rotation angle of the placing table 11.

[0057] Referring to the drawings Figure 5 As shown in the drawings, the detection device comprises a first conveying belt 21 conveying the veneer along a first direction, a second visual detection device 22 and a strip light source 23 are fixed on the first conveying belt 21, the strip light source 23 is arranged along a second direction, and the second visual detection device 22 is located directly above the strip light source 23.

[0058] The strip light source 23 is a white constant light source for lighting the veneer on the first conveying belt 21, and the second visual detection device 22 comprises a camera and a lens for taking a photo of the veneer directly below, the camera is a linear camera, and the lens is a line scanning lens. The second visual detection device 22 is used to obtain a clear color image of the veneer and transmit it to a controller to obtain the grading result of the veneer.

[0059] In one embodiment, a first pressure roller 24 is arranged on each side of the first direction of the strip light source 23, the first pressure roller 24 can rotate along its own axis, and a channel for the veneer to pass through is formed between the first pressure roller 24 and the first conveying belt 21. The two first pressure rollers 24 are used to flatten the veneer. Due to the natural growth characteristics of the veneer, the surface of the veneer is uneven and is prone to curling on the first conveying belt. The use of two pressure rollers prevents the veneer from curling when imaging, which can keep the product within the depth of field of the camera and ensure clear imaging results.

[0060] Referring to the drawings Figure 1 As shown in the drawings, because the conveying directions of the first conveying belt 21 and the sorting conveying belt 31 are perpendicular, the veneer grading device further comprises a direction changing mechanism 4 located between the sorting mechanism 3 and the detection mechanism 2, which is used to change the direction of the veneer conveyed along the first direction by the first conveying belt 21 to the second direction, so as to realize the turning of the veneer. Therefore, the veneer is conveyed along the longitudinal direction on the first conveying belt 21, and after changing the direction of the veneer, the veneer is discharged horizontally to ensure the safety of the product during the discharge of the veneer; horizontal discharge helps to reduce the overall length of the equipment; high-speed discharge can be realized to meet the requirements of rapid grading.

[0061] A direction changing mechanism 4 is further arranged between the sorting mechanism 3 and the detection mechanism 2, the direction changing mechanism 4 comprises a second conveying belt 41, a third conveying belt 42 and a turning conveying part 43, the second conveying belt 41 is butt-jointed with the first conveying belt 21 and has the same conveying direction, the third conveying belt 42 is butt-jointed with a sorting conveying belt 31 close to the feeding mechanism 1 and has the same conveying direction, and the turning conveying part 43 is located between the second conveying belt 41 and the third conveying belt 42 and is used to turn the veneer conveyed by the first conveying belt 21.

[0062] The second conveying belt 41 and the third conveying belt 42 are used to be connected with the first conveying belt 21 and the sorting conveying belt 31 respectively, and the carrying surface of the second conveying belt 41 is higher than the carrying surface of the third conveying belt 41. In an embodiment, at least one of the second conveying belt 41 and the third conveying belt 42 is not arranged, and the turning conveying part 43 is connected with the first conveying belt 21 or the sorting conveying belt 31, and the veneer turning and discharging can be realized.

[0063] Referring to FIG. 1, Figure 6 As shown in FIG. 1, the turning conveying part 43 comprises a fourth conveying belt 431, the fourth conveying belt 431 is used to convey the veneer in the second direction, and the fourth conveying belt 431 is provided with a plurality of position-allowing channels, each of the position-allowing channels is provided with a lifting turning roller 432, and all the lifting turning rollers 432 extend in the second direction and can rotate synchronously along the axis thereof.

[0064] The turning conveying part 43 further comprises a detection part 433, the lifting turning rollers 432 are in a lifting state initially, and the veneer on the second conveying belt 41 is conveyed to the lifting turning rollers 432. After the detection part 433 detects that the veneer is in place, the lifting turning rollers 432 are lowered until the veneer abuts against the fourth conveying belt 431, and the fourth conveying belt 431 is started to convey the veneer in a horizontal direction. The veneer conveyed in the horizontal direction is conveyed to the third conveying belt 42, and the veneer turning function is realized.

[0065] At this time, the whole veneer grading device forms an L-shaped structure, and the function of conveying the veneer in a longitudinal direction and discharging the veneer in a horizontal direction is realized, the high efficiency of the longitudinal conveying is realized, the safety and feasibility of the veneer during the discharging are ensured, and the size of the whole device is greatly reduced.

[0066] In an embodiment, referring to FIG. 2, Figure 6 As shown in FIG. 2, a second pressing roller 434 parallel to the lifting turning roller 432 is arranged above each of the lifting turning rollers 432, and the second pressing roller 434 can move along the third direction (Z direction) to approach or move away from the lifting turning roller 432. The second pressing roller 434 is used to press the veneer to avoid the veneer from being warped or deviated during the turning.

[0067] Referring to FIG. 3, Figure 7 As shown in FIG. 3, the sorting mechanism 3 further comprises a collecting cabin 32, the collecting cabin 32 is arranged below the sorting conveying belt 31 and corresponds to the sorting conveying belt 31, and the collecting cabin 32 is used to collect the veneer falling from the falling gap 311 or the last section of the sorting conveying belt 31. The veneer falling from the falling gap 311 can be collected in the collecting cabin 32, and each of the collecting cabins 32 is provided with a blocking plate to ensure that the veneer falls into the collecting cabin 32.

[0068] A detection optical fiber is fixed in each receiving cabin 32, and the detection optical fiber is linked with a swing driving part for driving the corresponding sorting conveyor belt 31 to swing. After the detection optical fiber confirms that the veneer has flowed through, the material channel restores to be flat.

[0069] One end of the sorting conveyor belt 31 is hinged with a second stand 33, and the sorting conveyor belt 31 can swing up and down around the hinge. The swing driving part is a cylinder hinged on the second stand 33, and the output shaft of the cylinder is hinged with the sorting conveyor belt 31, and the sorting conveyor belt 31 swings up and down by the extension and retraction of the output shaft of the cylinder.

[0070] Referring to the drawings, Figure 7 As shown in the drawings, the sorting mechanism 3 further comprises a pushing device 34 located on one side of the first direction of the sorting track, and the pushing device 34 is used for pushing the veneer in the receiving cabin 32 out, so as to facilitate the discharging. The pushing device 34 comprises a push plate capable of moving in a cross direction, and the push plate can move to one side of the first direction of a receiving cabin 32 and push the veneer in the receiving cabin 32 out along the first direction.

[0071] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A veneer grading apparatus, characterised in that: The application relates to a wood veneer sorting device. The wood veneer sorting device comprises a feeding mechanism, a detection mechanism and a sorting mechanism. The feeding mechanism comprises a placing table and a carrying assembly. The carrying assembly is arranged above the placing table and can move back and forth along a first direction.

2. The veneer grading apparatus of claim 1, wherein: The carrying assembly comprises at least one group of adsorption parts.

3. The veneer grading apparatus of claim 1, wherein: Each adsorption part can adsorb one wood veneer.

4. The veneer grading apparatus of claim 1, wherein: The detection mechanism is arranged on one side of the feeding mechanism along the first direction.

5. The veneer grading apparatus of claim 4, wherein: The detection mechanism is used for detecting the wood veneer carried by the carrying assembly.

6. The veneer grading apparatus of claim 1, wherein: The sorting mechanism is arranged on one side of the detection mechanism away from the feeding mechanism along the first direction.

7. The veneer grading apparatus of claim 6, wherein: The sorting mechanism comprises a plurality of sorting conveyors arranged in sequence along a second direction.

8. The veneer grading apparatus of claim 6, wherein: Each sorting conveyor conveys the wood veneer along the second direction.

9. The veneer grading apparatus of any of claims 1-8, wherein: The front end of each sorting conveyor along the conveying direction can swing up and down to butt joint with the sorting conveyor adjacent to the front end or form a falling gap. The adsorption part comprises a plurality of vacuum nozzles arranged in sequence along the second direction. The vacuum nozzles can respectively move along a third direction to approach or move away from the wood veneer. The feeding mechanism further comprises a rotating device, a lifting device and a first visual detection device. The lifting device is connected with the rotating device and is used for driving the rotating device to move along the third direction. The rotating device is connected with the placing table and drives the placing table to rotate in a horizontal plane. The first visual detection device is arranged above the placing table and is used for taking a photo of the uppermost wood veneer on the placing table. The detection mechanism comprises a first conveyor for conveying the wood veneer along the first direction. The first conveyor is fixed with a second visual detection device and a strip-shaped light source. The strip-shaped light source is arranged along the second direction. The second visual detection device is arranged directly above the strip-shaped light source. The two sides of the strip-shaped light source along the first direction are respectively provided with a first compression roller. The first compression roller can rotate along its own axis. A channel for the wood veneer to pass through is formed between the first compression roller and the first conveyor. The sorting mechanism further comprises a material collecting cabin. The material collecting cabin is arranged below the sorting conveyors and is arranged correspondingly with the sorting conveyors. The material collecting cabin is used for collecting the wood veneer falling from the falling gap or the last sorting conveyor. The sorting mechanism further comprises a material pushing device. The material pushing device is arranged on one side of the sorting conveyors along the first direction. The material pushing device is used for pushing the wood veneer in the material collecting cabin out. Each material collecting cabin is fixed with a detection optical fiber. The detection optical fiber is linked with a swinging driving part for driving the corresponding sorting conveyor to swing. The sorting mechanism and the detection mechanism are further provided with a direction changing mechanism. The direction changing mechanism comprises a second conveyor, a third conveyor and a turning conveying part. The second conveyor and the first conveyor butt joint and have the same conveying direction. The third conveyor and one sorting conveyor close to the feeding mechanism butt joint and have the same conveying direction. The turning conveying part is arranged between the second conveyor and the third conveyor. The turning conveying part is used for turning the wood veneer conveyed by the first conveyor.

10. The veneer grading apparatus of claim 9, wherein: The turning conveying part comprises a fourth conveying belt, the fourth conveying belt conveys veneers along the second direction, and the fourth conveying belt is provided with a plurality of displacement channels, each displacement channel is provided with a liftable turning roller, all the turning rollers extend along the second direction and can synchronously rotate along their own axes.

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