A device for automatically grading rotary-cut veneer

Abstract

The application discloses a kind of automatic grading device of rotary cut veneer, it is related to rotary cut veneer production technical field, including belt wheel conveying mechanism and for forcing rotary cut veneer to be adsorbed to the negative pressure mechanism of belt wheel conveying mechanism bottom, still including belt wheel deceleration mechanism, it has the first stroke of contact the rotary cut veneer and force rotary cut veneer to be adsorbed in belt wheel deceleration mechanism bottom and the second stroke of contact rotary cut veneer and force rotary cut veneer to fall into stacking area, the conveying speed of the rotary cut veneer in first stroke is lower than in belt wheel conveying mechanism conveying speed.The automatic grading device of rotary cut veneer provided in the application can make different grades of rotary cut veneer adsorbed in belt wheel conveying mechanism bottom and continuously transported by negative pressure mechanism and belt wheel conveying mechanism, when rotary cut veneer moves to corresponding grade stacking area, by the first stroke of belt wheel deceleration mechanism, rotary cut veneer can be switched to belt wheel deceleration mechanism bottom for conveying, then by the second stroke of belt wheel deceleration mechanism, rotary cut veneer can fall into corresponding grade stacking area.

Description

Technical Field

[0001] This invention relates to the field of rotary veneer production technology, and more specifically to an automatic grading device for rotary veneer. Background Technology

[0002] Rotary-cut veneer is a raw material for processing plywood and blockboard. Due to the nature of the wood itself or the rotary cutting process, rotary-cut veneer has varying degrees of defects. The processing of rotary-cut veneer-based engineered wood products requires grading the veneers. Boards with different defect levels must be graded and stored separately before further processing as needed. Manual sorting of rotary-cut veneer is not only inefficient but also involves too many subjective factors in grading and results in poor stacking. This invention aims to solve these problems.

[0003] Similarly, patent application CN109708592A, published on May 3, 2019, entitled "An Automatic Detection and Grading Device for Board Materials," includes a shelf for boards to be inspected and a board inspection device for grading the boards; five grade-specific board stacking areas for storing the corresponding boards; and a conveyor belt system for transporting the boards. This patent enables graded boards to be stacked separately according to their grade, saving steps and reducing labor costs.

[0004] In the existing technology, veneer is directly transported by a conveyor belt. When stacked separately according to grade, the baffles are directly detached from the conveyor belt and fall into the stacking area. Obviously, the veneer has a certain speed when it is continuously transported on the conveyor belt. If the veneer is directly detached from the conveyor belt, it will move horizontally while falling, which will cause the veneer in the stacking area to be stacked in a disorderly manner. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic grading device for rotary-cut veneers to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic veneer sorting device includes a pulley conveyor mechanism and a negative pressure mechanism for forcing the veneers to adhere to the bottom of the pulley conveyor mechanism, and further includes:

[0008] The pulley reduction mechanism has a first stroke that abuts against the rotary-cut veneer and forces the rotary-cut veneer to adhere to the bottom of the pulley reduction mechanism, and a second stroke that abuts against the rotary-cut veneer and forces the rotary-cut veneer to fall into the stacking area, wherein the conveying speed of the rotary-cut veneer in the first stroke is lower than the conveying speed in the pulley conveying mechanism.

[0009] The aforementioned automatic sizing device for rotary-cut veneers includes a pulley conveying mechanism comprising two first synchronous pulleys and a first synchronous belt fitted onto the two first synchronous pulleys.

[0010] The aforementioned automatic sizing device for rotary-cut veneers includes a negative pressure mechanism comprising a negative pressure tube and several adsorption holes located at the bottom of the negative pressure tube.

[0011] The aforementioned automatic sizing device for rotary-cut veneers includes a pulley reduction mechanism comprising a lifting plate and two second synchronous pulleys rotatably connected to the lifting plate, with a second synchronous belt fitted onto the two second synchronous pulleys.

[0012] In the aforementioned automatic sizing device for rotary-cut veneers, an elastic element is provided between the negative pressure pipe and the lifting plate.

[0013] In the aforementioned automatic grading device for rotary-cut veneers, a support plate is fixed on the negative pressure pipe, a lifting groove is constructed on the support plate, a lifting rod is fixed on the lifting plate and the lifting rod is slidably connected in the lifting groove, and a connecting plate is fixed at the top of the lifting rod.

[0014] The aforementioned automatic grading device for rotary-cut veneers includes a sliding plate slidably connected to the support plate, the sliding plate having a first wedge-shaped surface and a second wedge-shaped surface, and a connecting column provided on the connecting plate.

[0015] The aforementioned automatic sizing device for rotary-cut veneers has a third wedge-shaped surface constructed on the sliding plate.

[0016] In the aforementioned automatic sizing device for rotary-cut veneers, a driven roller is coaxially fixed on a second synchronous wheel, a drive roller is rotatably connected to the support plate, and a transmission wheel is also provided on the support plate.

[0017] In the aforementioned automatic sizing device for rotary-cut veneers, both the driving roller and the driven roller are constructed in the shape of a frustum, a slider is slidably connected to the support plate, and the transmission wheel is rotatably connected to the slider.

[0018] In the above technical solution, the present invention provides an automatic veneer sorting device. Through a negative pressure mechanism and a pulley conveyor mechanism, veneers of different grades are adsorbed at the bottom of the pulley conveyor mechanism and continuously conveyed. When the veneer moves to the corresponding grade stacking area, the first stroke of the pulley reduction mechanism can abut the veneer, so that the veneer is switched to the bottom of the pulley reduction mechanism for conveying. Subsequently, the second stroke of the pulley reduction mechanism can continue to abut the veneer, so that the veneer falls into the corresponding grade stacking area. During the process of the veneer switching from the bottom of the pulley conveyor mechanism to the bottom of the pulley reduction mechanism, the conveying speed of the veneer is reduced, that is, the horizontal offset distance when the veneer falls into the stacking area is reduced, so as to avoid the veneers being scattered in the stacking area as much as possible. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a pulley reduction mechanism provided in another embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of a lifting plate structure provided in another embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a limiting groove structure provided in another embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a skateboard structure provided in another embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the drive roller and driven roller structure provided in another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the extension structure provided in another embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First synchronous pulley; 2. First synchronous belt; 3. Negative pressure pipe; 31. Adsorption hole; 4. Lifting plate; 5. Second synchronous pulley; 6. Second synchronous belt; 7. Elastic element; 8. Support plate; 9. Lifting rod; 10. Connecting plate; 11. Slide plate; 111. First wedge surface; 112. Second wedge surface; 113. First horizontal surface; 114. Third wedge surface; 115. Second horizontal surface; 12. Connecting column; 13. Slide groove; 14. Limiting groove; 15. Driven roller; 16. Drive roller; 17. Transmission wheel; 18. Slider; 19. Through groove; 20. Extension; 21. Synchronizing rod. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Reference Figure 1-7This invention provides an automatic veneer sorting device, including a pulley conveying mechanism and a negative pressure mechanism for forcing the veneer to adhere to the bottom of the pulley conveying mechanism. It also includes a pulley deceleration mechanism, which has a first stroke that abuts against the veneer and forces it to adhere to the bottom of the pulley deceleration mechanism, and a second stroke that abuts against the veneer and forces it to fall into a stacking area. The conveying speed of the veneer in the first stroke is lower than the conveying speed in the pulley conveying mechanism.

[0031] Specifically, after production, the veneer is graded according to characteristics such as size or defects. The graded veneer is then conveyed via a pulley conveyor mechanism. The pulley conveyor mechanism and the negative pressure mechanism are arranged in the same direction (the two can be installed on the same main body, which is not shown in the figure). While the pulley conveyor mechanism is conveying veneers of different grades, the negative pressure mechanism runs continuously to force the veneers to adhere to the bottom of the pulley conveyor mechanism. Multiple stacking areas are arranged along the length of the pulley conveyor mechanism, and these stacking areas are divided into different grades to stack veneers of the corresponding grades. When the veneer moves with the pulley conveyor mechanism to the stacking area of ​​the corresponding grade, a pusher plate pushes the veneer downward to separate it from the pulley conveyor mechanism, thereby causing the veneer to lose the adhesion of the negative pressure mechanism and fall into the corresponding stacking area. The above are all existing technologies and will not be elaborated here. The innovation of this invention lies in the arrangement of multiple pulley reduction mechanisms along the length of the pulley conveyor, with each pulley reduction mechanism corresponding to a multiple stacking area. The pulley reduction mechanisms can utilize existing belt-driven conveyor structures. During the downward movement, the pulley reduction mechanisms have a first stroke and a second stroke. In the first stroke, the bottom of the pulley reduction mechanism abuts against the rotary-cut veneer, causing the veneer to switch from the bottom of the pulley conveyor to the bottom of the pulley reduction mechanism. During this process, a negative pressure mechanism maintains the adsorption of the rotary-cut veneer, ensuring its stable position at the bottom of the pulley reduction mechanism. In the second stroke, the pulley reduction mechanism forces the rotary-cut veneer to continue moving downwards until its weight exceeds the adsorption force of the negative pressure mechanism, at which point the veneer falls into the corresponding stacking area. The speed at which the pulley reduction mechanism conveys the rotary-cut veneer is less than the speed at which the pulley conveyor conveys the veneer, thus reducing the conveying speed of the veneer during the first stroke. The advantage of this setup is that when veneer is sorted and stacked, the pulley conveyor mechanism can continuously transport veneer of different grades until it reaches the corresponding grade's stacking area. At this point, the pulley deceleration mechanism slows down the veneer and allows it to fall into the corresponding stacking area. This reduces the conveying speed of the veneer being sorted without changing the conveying speed of other veneers, thereby reducing the horizontal offset distance of the veneer when it falls into the stacking area. (When the stacking area does not have a lifting function and the veneer has a horizontal speed, for several veneers falling into the same stacking area, the horizontal offset distance of the lower layer of veneers is larger, and the horizontal offset distance of the upper layer of veneers is smaller, which will lead to the veneers being scattered and stacked in the same stacking area.) This minimizes the possibility of veneers being scattered and stacked in the stacking area.

[0032] This invention provides an automatic veneer sorting device. Through a negative pressure mechanism and a pulley conveyor mechanism, veneers of different grades are adsorbed at the bottom of the pulley conveyor mechanism and continuously transported. When the veneers move to the corresponding grade's stacking area, the first stroke of the pulley reduction mechanism abuts against the veneers, causing them to switch to the bottom of the pulley reduction mechanism for further transport. Subsequently, the second stroke of the pulley reduction mechanism continues to abut against the veneers, causing them to fall into the corresponding grade's stacking area. During the process of the veneers switching from the bottom of the pulley conveyor mechanism to the bottom of the pulley reduction mechanism, the conveying speed of the veneers decreases, meaning the horizontal offset distance when the veneers fall into the stacking area is reduced, minimizing the possibility of scattered veneers in the stacking area.

[0033] In another embodiment of the present invention, the pulley conveying mechanism further includes two first synchronous pulleys 1 and a first synchronous belt 2 sleeved on the two first synchronous pulleys 1. The negative pressure mechanism includes a negative pressure pipe 3 and a plurality of adsorption holes 31 constructed at the bottom of the negative pressure pipe 3. Specifically, the two first synchronous pulleys 1 are located in the same plane (both are rotatably connected to the main body), and the first synchronous belt 2 is sleeved on the two first synchronous pulleys 1, so that when one first synchronous pulley 1 rotates, it can drive the first synchronous belt 2 and the other first synchronous pulley 1 to run synchronously (the power to drive the rotation of one first synchronous pulley 1 can be a motor structure in the prior art, not shown); a vacuum pump or centrifugal pump is provided on the negative pressure pipe 3 to extract the air in the negative pressure pipe 3 (the negative pressure pipe 3 can be fixed on the main body), thereby putting the plurality of adsorption holes 31 in a negative pressure state, and thus adsorbing the passing rotary-cut veneer; The first synchronous belt 2 is arranged along the length of the negative pressure pipe 3. Two sets of pulley conveying mechanisms are provided, with the two sets of pulley conveying mechanisms located on both sides of the negative pressure pipe 3. The bottom wall of the negative pressure pipe 3 is higher than the bottom wall of the first synchronous belt 2. When the rotary-cut veneer is at the bottom of the first synchronous belt 2, the suction force of the negative pressure pipe 3 on the rotary-cut veneer is upward, so that the rotary-cut veneer overcomes gravity and abuts against the bottom of the first synchronous belt 2. As the pulley conveying mechanism runs, the first synchronous belt 2 conveys the rotary-cut veneer. During the process, several suction holes 31 at the bottom of the negative pressure pipe 3 maintain the suction of the rotary-cut veneer, so that the rotary-cut veneer is conveyed stably.

[0034] Preferably, the pulley reduction mechanism includes a lifting plate 4 and two second synchronous pulleys 5 rotatably connected to the lifting plate 4, and a second synchronous belt 6 is sleeved on the two second synchronous pulleys 5. Specifically, the second synchronous belt 6 is fitted onto two second synchronous pulleys 5, so that when one second synchronous pulley 5 rotates, it can drive the second synchronous belt 6 and the other second synchronous pulley 5 to rotate (the power driving the rotation of one second synchronous pulley 5 can be a motor structure in the prior art, not shown); the lifting plate 4 is located between the negative pressure pipe 3 and a set of pulley transmission mechanisms, and the lifting plate 4 is slidably connected to the negative pressure pipe 3 (the sliding connection structure can be a slide rail structure), and the driving force for the lifting plate 4 to slide along the negative pressure pipe 3 can be an electric push rod structure in the prior art, so that the lifting plate 4 has a certain lifting stroke; the second synchronous belt 6 is set along the length direction of the first synchronous belt 2, and when the lifting plate 4 is at the top of its stroke, the bottom wall of the second synchronous belt 6 is higher than the bottom wall of the first synchronous belt 2, and the second synchronous belt 6 does not contact the rotary-cut veneer at the bottom of the first synchronous belt 2; when the rotary-cut veneer is sorted and stacked, the lifting plate 4 moves down to drive the second synchronous belt 6 to abut against the rotary-cut veneer at the bottom of the first synchronous belt 2. The pulley reduction mechanism initiates the first stroke of the rotary cutting veneer, which forces the veneer to be sorted from the bottom of the first synchronous belt 2 to the bottom of the second synchronous belt 6. During this process, the suction force of the negative pressure pipe 3 on the rotary cutting veneer is greater than the weight of the veneer, allowing the veneer to be stably attached to the bottom of the second synchronous belt 6. The second synchronous belt 6 conveys the rotary cutting veneer at a speed lower than the first synchronous belt 2, causing the speed of the veneer to decrease after switching from the first synchronous belt 2 to the second synchronous belt 6. After the speed of the veneer decreases, the lifting plate 4 continues to descend, causing the second synchronous belt 6 to continue to contact the veneer downwards, thus moving the veneer to the corresponding grade's stacking area until the suction force of the negative pressure pipe 3 on the veneer is less than the weight of the veneer. Then, the veneer falls into the stacking area under the action of gravity. This is the second stroke of the pulley reduction mechanism. After the veneer falls into the stacking area, the lifting plate 4 resets to perform the sorting and stacking operation for the next veneer of the same grade.

[0035] Furthermore, an elastic element 7 is provided between the negative pressure pipe 3 and the lifting plate 4. Specifically, under the action of the elastic element 7, the lifting plate 4 and the second synchronous belt 6, etc., are at the top of their sliding stroke. When the lifting plate 4 is driven to move downward, the elastic element 7 stores elastic potential energy. After the single boards are rotary-cut and stacked, the elastic element 7 assists the lifting plate 4 to return to the top of its stroke. Preferably, a support plate 8 is fixed on the negative pressure pipe 3, a lifting groove is constructed on the support plate 8, a lifting rod 9 is fixed on the lifting plate 4 and the lifting rod 9 is slidably connected in the lifting groove, and a connecting plate 10 is fixed to the top of the lifting rod 9. The lifting rod 9 has a protruding structure (not shown), which is located at the bottom of the support plate 8 and has a diameter larger than the diameter of the lifting groove. The elastic element 7 is a spring from the prior art. The spring is sleeved on the lifting rod 9, and its two ends are fixed to the lifting plate 4 and the support plate 8 respectively. The spring forces the lifting plate 4 to move upward and closer to the support plate 8, thereby forcing the protruding structure to abut against the bottom wall of the support plate 8. At this time, the lifting plate 4 is at the top of its stroke (that is, at this time the bottom wall of the second synchronous belt 6 is higher than the bottom wall of the first synchronous belt 2).

[0036] As an alternative to the aforementioned electric push rod driving the lifting plate 4 to slide along the negative pressure pipe 3, preferably, a sliding plate 11 is slidably connected to the support plate 8, the sliding plate 11 having a first wedge-shaped surface 111 and a second wedge-shaped surface 112, and a connecting post 12 is provided on the connecting plate 10. Specifically, in the above embodiment, the transmission speed of the second synchronous belt 6 is less than the transmission speed of the first synchronous belt 2, so that the veneer has a deceleration effect after switching to the second synchronous belt 6. Obviously, the deceleration of the veneer requires a certain amount of time. In order to ensure that the veneer can be attracted to the bottom of the second synchronous belt 6 while decelerating, the pulley deceleration mechanism needs to pause for a moment after running the first stroke before running the second stroke. For this purpose, the sliding plate 11 and other structures are provided. In this embodiment, a linear drive mechanism is provided on the negative pressure pipe 3 to drive the slide plate 11 to slide along the support plate 8. The linear drive mechanism can be a cylinder or lead screw structure in the prior art. A slide groove 13 is constructed on the support plate 8, and the slide plate 11 is slidably connected in the slide groove 13 so that the linear drive mechanism can drive the slide plate 11 to slide along the slide groove 13. A protrusion is constructed on the side of the slide plate 11 near the connecting plate 10. The bottom of the protrusion is constructed with a first wedge surface 111 and a second wedge surface 112. A first horizontal surface 113 is formed between the first wedge surface 111 and the second wedge surface 112. The two ends of the first horizontal surface 113 are respectively connected to the first wedge surface 111 and the second wedge surface 112. A connecting post 12 is provided on the side of the connecting plate 10 near the slide plate 11. The connection between the connecting post 12 and the connecting plate 10 can be a fixed connection. The connecting post 12 and the protrusion are adapted to each other and are both located between the slide plate 11 and the connecting plate 10. Figure 3As shown, when the slide plate 11 moves uniformly to the left along the slide groove 13, the first wedge surface 111 first abuts against the connecting column 12, forcing the connecting column 12 and the connecting plate 10 to move downwards, thereby driving the pulley reduction mechanism to run the first stroke. During this process, the elastic element 7 stores elastic potential energy and forces the connecting column 12 to abut against the bottom of the protrusion. Subsequently, the connecting column 12 moves relative to the first horizontal plane 113. During this process, the pulley reduction mechanism is between the first stroke and the second stroke, and the second synchronous belt 6 abuts against the rotary-cut veneer and forces the rotary-cut veneer to decelerate. Until the connecting column 12 moves relative to the position of the second wedge surface 112, The second wedge-shaped surface 112 abuts against the connecting post 12 to force the connecting plate 10 to continue moving downward, thereby driving the pulley reduction mechanism to run the second stroke, so that the rotary-cut veneer falls into the corresponding level of the stacking area. The advantage of this arrangement is that, in this embodiment, the linear drive mechanism only needs to drive the slide plate 11 to move at a constant speed along the slide groove 13 to drive the connecting plate 10 to move intermittently downward through the first wedge-shaped surface 111 and the second wedge-shaped surface 112, so that the pulley reduction mechanism pauses for a certain period of time between the first stroke and the second stroke, so that the rotary-cut veneer has a certain amount of time to decelerate, thereby maximizing the stability of the rotary-cut veneer when it falls into the stacking area.

[0037] Furthermore, the slide plate 11 is constructed with a third wedge-shaped surface 114. Specifically, in the above embodiment, the linear drive mechanism drives the slide plate 11 to move in the opposite direction, which in turn drives the pulley reduction mechanism to reset. Correspondingly, when the slide plate 11 resets, the connecting post 12 passes the first wedge-shaped surface 111, which is opposite to the second wedge-shaped surface 112 and the first horizontal surface 113, until the first wedge-shaped surface 111 separates from the connecting post 12. Then, the second synchronous belt 6 resets under the action of the elastic member 7. Obviously, this reset method will cause the pulley reduction mechanism to reset with a delay. For pulley conveying mechanisms that continuously transport different levels of pulleys, the pulley reduction mechanism in the first or second stroke may affect the transport of other rotary-cut veneers. In this embodiment, as Figure 4 As shown, the top of the protrusion has a third wedge-shaped surface 114, which is located on the side of the protrusion away from the first wedge-shaped surface 111. The top of the protrusion has a second horizontal surface 115, which is connected to the first wedge-shaped surface 111 and the third wedge-shaped surface 114 on both sides. A limiting groove 14 is constructed on the connecting plate 10, and the connecting post 12 is hinged in the limiting groove 14. A torsion spring is provided in the limiting groove 14 to force the connecting post 12 to abut against the bottom wall of the limiting groove 14, thereby forcing the connecting post 12 and the connecting plate 10 to be in the same plane. When the connecting post 12 is subjected to an upward external force, the connecting post 12 will overcome the elastic force of the torsion spring and rotate upward, so that the connecting post 12 rotates to the top of the connecting plate 10. The purpose of this arrangement is that, Figure 4As shown, when the linear drive mechanism drives the slide plate 11 to move to the left, the first wedge surface 111 and the second wedge surface 112 can successively abut against the connecting column 12. During this process, the abutting force on the connecting column 12 forces it to move downward, so that the connecting column 12 abuts against the bottom wall of the limiting groove 14 and forces the connecting plate 10 and the pulley reduction mechanism to move downward synchronously. Until the second wedge surface 112 separates from the connecting column 12, the connecting column 12 is no longer restricted by the protrusion, allowing the connecting plate 10 and other structures to reset under the elastic force of the elastic element 7. This allows the pulley reduction mechanism to reset as soon as possible after completing the sorting and stacking of the rotary-cut veneers. After the pulley reduction mechanism resets, the connecting column 12 moves to the position corresponding to the third wedge surface 114. At this time, the linear drive mechanism drives the slide plate 11 to reset (move to the right), and the connection is completed. The third wedge surface 114 abuts against the connecting post 12. The abutting force of the third wedge surface 114 against the connecting post 12 is used to force the connecting post 12 to move upward. At this time, the connecting plate 10 and the pulley reduction mechanism have moved to the top of their stroke under the action of the elastic element 7, that is, the connecting plate 10 can no longer move upward. At this time, the abutting force of the third wedge surface 114 against the connecting post 12 will cause the connecting post 12 to overcome the elastic force of the torsion spring and deflect upward in the limiting groove 14. Then, the second horizontal surface 115 can keep the connecting post 12 deflected until the slide plate 11 is reset. The connecting post 12 is separated from the protrusion, and the connecting post 12 is reset under the action of the torsion spring and abuts against the bottom wall of the limiting groove 14 again, so that the connecting post 12 corresponds to the first wedge surface 111, which is convenient for the next grade of rotary-cut veneer to be sorted and stacked when the slide plate 11 moves again. The advantage is that, in this embodiment, the connecting post 12 is movably connected to the connecting plate 10, and a third wedge surface 114 is provided, so that the pulley reduction mechanism can be reset in time after being forced to run the second stroke by the slide plate 11, so as to avoid affecting the transmission of other rotary-cut single boards on the pulley transmission mechanism as much as possible. During the reciprocating operation, the sliding plate 11 has different directions of resistance to the connecting post 12. The resistance of the first wedge surface 111, the first horizontal surface 113 and the second wedge surface 112 to the connecting post 12 is downward, so that the connecting post 12 can abut against the bottom wall of the limiting groove 14 and drive the connecting plate 10 to move synchronously. The resistance of the third wedge surface 114 and the second horizontal surface 115 to the connecting post 12 is upward, so that the connecting post 12 can overcome the elastic force of the torsion spring and deflect upward, so that the connecting post 12 avoids the protrusion after the pulley reduction mechanism is reset, and interference between the protrusion and the connecting post 12 is avoided as much as possible.

[0038] In another embodiment of the present invention, as an alternative to the above-mentioned motor structure driving a second synchronous pulley 5 to rotate, preferably, a driven roller 15 is coaxially fixed on a second synchronous pulley 5, a drive roller 16 is rotatably connected to the support plate 8, and a transmission wheel 17 is also provided on the support plate 8. Specifically, a first connecting part is constructed on the lifting plate 4, and the driven roller 15 is rotatably connected to the first connecting part; a second connecting part is constructed on the support plate 8, and the drive roller 16 is rotatably connected to the second connecting part; the transmission wheel 17 is located between the drive roller 16 and the driven roller 15, and a friction wheel in the prior art can be used between the three, so that friction transmission can be realized between the drive roller 16, the driven roller 15 and the transmission wheel 17; a power source is provided on the support plate 8 to drive the drive roller 16 to rotate. When the drive roller 16 rotates, a second synchronous pulley 5 can be driven to rotate through the transmission wheel 17 and the driven roller 15, thereby driving the second synchronous belt 6 to decelerate and convey the rotary-cut veneer. The advantage is that when the power source drives the second synchronous belt 6 to convey the veneer through the drive roller 16 and other structures, the speed at which the power source drives the second synchronous belt 6 to convey the veneer is adjustable. That is, the speed at which the second synchronous belt 6 conveys the veneer can be adjusted so that after the veneer switches to the bottom of the second synchronous belt 6, the speed of the second synchronous belt 6 is gradually reduced, thereby forcing the veneer to decelerate and move. This makes the horizontal speed of the veneer drop to zero after it moves to a specific position. This can eliminate the influence of the horizontal speed on the veneer when it falls into the stacking area, so that the veneer can be stacked as neatly as possible.

[0039] As an alternative to the above-mentioned method of adjusting the transmission speed of the second synchronous belt 6 via a power source, preferably, both the driving roller 16 and the driven roller 15 are constructed in the shape of a frustum, a slider 18 is slidably connected to the support plate 8, and the transmission wheel 17 is rotatably connected to the slider 18. Specifically, both the driving roller 16 and the driven roller 15 are constructed in the shape of a frustum (i.e., one end has a larger diameter than the other end), and the central axes of the driving roller 16 and the driven roller 15 are parallel to each other and arranged opposite to each other (e.g., ...). Figure 6 As shown), when the pulley transmission mechanism is between the first and second strokes (i.e., when the connecting column 12 is abutting against the first horizontal plane 113), the two opposite sides of the transmission wheel 17 are respectively connected to the driving roller 16 and the driven roller 15. Conversely, when the connecting column 12 moves away from the position of the first horizontal plane 113, the driving roller 16 and the driven roller 15 lose transmission. A through groove 19 is constructed on the first connecting part of the support plate 8. The through groove 19 is set along the edge line of the opposite side of the driving roller 16 and the driven roller 15. The slider 18 is slidably connected in the through groove 19. When the connecting column 12 is abutting against the first horizontal plane 113, even if the slider 18 moves along the through groove 19, the driving roller 16 and the driven roller 15 can still be connected by transmission through the transmission wheel 17. The purpose of this arrangement is that, Figure 6As shown, when the slider 18 is on the right side of the through groove 19, the end of the drive roller 16 with a larger diameter is connected to the end of the driven roller 15 with a smaller diameter (through the transmission wheel 17). Conversely, when the slider 18 moves to the left along the through groove 19, the end of the drive roller 16 with a smaller diameter is connected to the end of the driven roller 15 with a larger diameter. That is, without changing the rotation speed of the drive roller 16, the slider 18 can reduce the speed at which the second synchronous belt 6 conveys the rotary cut veneer by moving to the left along the through groove 19.

[0040] If the speed difference between the first synchronous belt 2 and the second synchronous belt 6 in conveying the rotary-cut veneer is large, the veneer is easily pulled by the first synchronous belt 2 and the second synchronous belt 6 when switching from the first synchronous belt 2 to the second synchronous belt 6. This can cause the veneer to deviate. To address this, a drive roller 16 and a transmission wheel 17 are installed. When the veneer switches from the first synchronous belt 2 to the second synchronous belt 6, the speed at which the second synchronous belt 6 conveys the veneer is basically the same as the speed at which the first synchronous belt 2 conveys the veneer. This allows the veneer to switch smoothly and come into contact with the bottom of the second synchronous belt 6. When the pulley reduction mechanism is between the first and second strokes, the drive slider 18 moves away from the second synchronous belt 6 along the through groove 19 to gradually reduce the speed of the second synchronous belt 6, thereby smoothly reducing the conveying speed of the veneer. Until the pulley reduction mechanism is running the second stroke, the speed of the veneer at the bottom of the second synchronous belt 6 approaches zero. This can minimize the horizontal deviation of the veneer when it falls into the stacking area.

[0041] Furthermore, a linkage mechanism is also included, which drives the slider 18 and the slide plate 11 to slide synchronously along the support plate 8. Specifically, in the above embodiment, the driving force for the slider 18 to move along the through groove 19 can be a structure such as a cylinder in the prior art, so that the cylinder works synchronously with the linear drive mechanism, thereby driving the slider 18 and the slide plate 11 to slide synchronously along the support plate 8. Preferably, in this embodiment, the slide plate 11 is provided with an extension 20, the extension 20 is provided with a movable groove, and a synchronizing rod 21 is fixed on the slider 18, the synchronizing rod 21 being located in both the through groove 19 and the movable groove. The advantage of this arrangement is that when the slide plate 11 moves away from the second synchronous belt 6 along the support plate 8, the synchronous rod 21 can be forced to move synchronously through the inner wall of the movable groove. Since the sliding groove 13 and the through groove 19 are set in different directions, the moving trajectories of the slide plate 11 and the slider 18 are different. Therefore, the movable groove is set as a long strip. When the synchronous rod 21 and the slider 18 are forced to move through the inner wall of the movable groove, the synchronous rod 21 can move adaptably in the movable groove to adapt to the different moving trajectories of the slide plate 11 and the slider 18. In this way, the slider 18 can be moved along the through groove 19 at the same time as the linear drive mechanism moves the slide plate 11. The advantage is that when the linear drive mechanism drives the slide plate 11 away from the second synchronous belt 6 along the slide groove 13, the slide plate 11 can force the pulley reduction mechanism to run the first stroke and the second stroke in sequence. Between the first stroke and the second stroke, the connecting column 12 is in contact with the first horizontal surface 113. Since the slide plate 11 and the slider 18 move synchronously on the support plate 8, when the slide plate 11 moves away from the second synchronous wheel 5, the slider 18 also moves away from the second synchronous wheel 5 synchronously. That is, when the connecting column 12 moves relative to the first horizontal surface 113, the transmission wheel 17 moves between the drive roller 16 and the driven roller 15 to reduce the speed of the second synchronous wheel 5, thereby gradually reducing the speed of the second synchronous conveyor of the veneer. When the linear drive mechanism drives the slide plate 11 to reset, the pulley reduction mechanism is directly reset under the action of the elastic element 7. At this time, the driven roller 15 moves with the lifting plate 4 and separates from the transmission wheel 17, so that the second synchronous wheel 5 is not driven. That is, after the veneer is sorted and stacked, the pulley reduction mechanism is not driven by the drive roller 16, thus avoiding the waste of kinetic energy as much as possible.

[0042] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A rotary cut veneer automatic grading apparatus comprising a belt wheel conveyor and a negative pressure mechanism for forcing rotary cut veneer to adhere to the bottom of the belt wheel conveyor, characterized by, Also included are: The belt wheel deceleration mechanism has a first stroke of resisting the rotary veneer and forcing the rotary veneer to be adsorbed at the bottom of the belt wheel deceleration mechanism and a second stroke of resisting the rotary veneer and forcing the rotary veneer to fall into the stacking area, and the conveying speed of the rotary veneer in the first stroke is lower than the conveying speed in the belt wheel conveying mechanism.

2. The rotary veneer automatic grading device according to claim 1, wherein, The belt wheel conveying mechanism comprises two first synchronous wheels and a first synchronous belt sleeved on the two first synchronous wheels.

3. The rotary veneer automatic sorting device according to claim 1, wherein, The negative pressure mechanism comprises a negative pressure pipe and a plurality of adsorption holes constructed at the bottom of the negative pressure pipe.

4. The rotary-cut veneer automatic grading device of claim 1, wherein, The belt wheel deceleration mechanism comprises a lifting plate and two second synchronous wheels rotatably connected to the lifting plate, and a second synchronous belt is sleeved on the two second synchronous wheels.

5. The rotary-cut veneer automatic grading device according to claim 4, wherein, An elastic member is arranged between the negative pressure pipe and the lifting plate.

6. The rotary-cut veneer automatic grading device according to claim 5, wherein, A support plate is fixed on the negative pressure pipe, and a lifting groove is constructed on the support plate.

7. The rotary-cut veneer automatic grading device according to claim 6, wherein, A lifting rod is fixed on the lifting plate and slidably connected in the lifting groove.

8. The rotary-cut veneer automatic grading device according to claim 7, wherein, A connecting plate is fixed on the top end of the lifting rod.

9. The rotary veneer slicing automatic grading device of claim 6, wherein, A sliding plate is slidably connected on the support plate.

10. The rotary-cut veneer automatic grading device of claim 9, wherein, A first wedge surface and a second wedge surface are constructed on the sliding plate. A connecting column is arranged on the connecting plate. A third wedge surface is constructed on the sliding plate. A driven roller is coaxially fixed on one of the second synchronous wheels. A driving roller is rotatably connected on the support plate. A transmission wheel is further arranged on the support plate. The driving roller and the driven roller are both constructed in a circular truncated cone shape. A sliding block is slidably connected on the support plate. The transmission wheel is rotatably connected with the sliding block.

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