Automatic grading device for rotary-cut veneers

Abstract

The invention discloses an automatic grading device for rotary-cut veneers, which relates to the technical field of rotary-cut veneer production and comprises a belt wheel conveying mechanism and a negative pressure mechanism for forcing the rotary-cut veneers to be adsorbed to the bottom of the belt wheel conveying mechanism, and further comprises a belt wheel speed reducing mechanism, the first stroke is used for abutting against the rotary-cut veneers and forcing the rotary-cut veneers to be adsorbed to the bottom of the belt wheel speed reducing mechanism, the second stroke is used for abutting against the rotary-cut veneers and forcing the rotary-cut veneers to fall into a stacking area, and the conveying speed of the rotary-cut veneers in the first stroke is lower than that of the rotary-cut veneers in the belt wheel conveying mechanism. According to the automatic grading device for the rotary-cut veneers, the rotary-cut veneers of different grades can be adsorbed to the bottom of the belt wheel conveying mechanism and continuously conveyed through the negative pressure mechanism and the belt wheel conveying mechanism; the rotary-cut veneers can be switched to the bottom of the belt wheel speed reducing mechanism to be conveyed through the first stroke of the belt wheel speed reducing mechanism, and then the rotary-cut veneers can fall into the stacking area of the corresponding grade through the second stroke of the belt wheel speed reducing mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of rotary cut veneer production, and in particular to an automatic grading device for rotary cut veneers. Background Art

[0002] Peeled veneer is the raw material for processing plywood and blockboard. Due to the wood itself or the peeling process, the peeled veneer has defects of varying degrees. The processing of peeled veneer-like man-made boards requires grading of the peeled veneer. After the boards with different defect levels are graded and stored, the peeled veneer-like man-made boards can be processed as needed. Manual sorting of peeled veneers is not only inefficient, but also involves too many subjective factors such as judgment, and the stacking effect is poor. The present invention aims to solve the above problems.

[0003] Similarly, for example, the patent document with application publication number CN109708592A and application publication date May 3, 2019, entitled "A plate automatic detection and grading device", includes a plate rack to be detected and a plate detection device, the plate detection device is used to grade the plates; 5 grade plate stacking areas are used to stack the corresponding plates; and a conveyor belt group is used to transport the plates. This patent can stack the graded plates separately by grade, saving processes and reducing labor costs.

[0004] In the prior art, the rotary cut veneers are directly transported by a conveyor belt. When they are stacked separately by grade, the baffle is directly detached from the conveyor belt and falls into the stacking area. Obviously, the rotary cut veneers have a certain speed when they are continuously transported on the conveyor belt. If the rotary cut veneers are directly detached from the conveyor belt, the rotary cut veneers will move horizontally while falling, which will cause the rotary cut veneers in the stacking area to be stacked in a scattered manner. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic grading device for peeled veneers to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An automatic grading device for peeled veneers, comprising a belt wheel transmission mechanism and a negative pressure mechanism for forcing the peeled veneers to be adsorbed to the bottom of the belt wheel transmission mechanism, and further comprising:

[0008] The belt wheel reduction mechanism has a first stroke for resisting the peeled veneer and forcing the peeled veneer to be adsorbed on the bottom of the belt wheel reduction mechanism and a second stroke for resisting the peeled veneer and forcing the peeled veneer to fall into the stacking area. The conveying speed of the peeled veneer in the first stroke is lower than the conveying speed in the belt wheel conveying mechanism.

[0009] In the above-mentioned automatic grading device for peeled veneers, the pulley transmission mechanism includes two first synchronous wheels and a first synchronous belt sleeved on the two first synchronous wheels.

[0010] In the above-mentioned automatic grading device for peeled veneers, the negative pressure mechanism includes a negative pressure tube and a plurality of adsorption holes constructed at the bottom of the negative pressure tube.

[0011] In the above-mentioned automatic grading device for peeled veneers, the pulley speed reduction mechanism includes a lifting plate and two second synchronous wheels rotatably connected to the lifting plate, and the two second synchronous wheels are sleeved with second synchronous belts.

[0012] In the above-mentioned automatic grading device for peeled veneers, an elastic member is provided between the negative pressure tube and the lifting plate.

[0013] In the above-mentioned automatic grading device for peeled veneers, a support plate is fixed on the negative pressure tube, a lifting slot 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 slot, and a connecting plate is fixed on the top of the lifting rod.

[0014] In the above-mentioned automatic grading device for peeled veneers, a slide plate is slidably connected to the support plate, a first wedge surface and a second wedge surface are constructed on the slide plate, and a connecting column is arranged on the connecting plate.

[0015] In the above-mentioned automatic grading device for peeled veneers, a third wedge-shaped surface is constructed on the slide plate.

[0016] In the above-mentioned automatic grading device for peeled veneers, a driven roller is coaxially fixed on the second synchronous wheel, a driving roller is rotatably connected to the support plate, and a transmission wheel is also arranged on the support plate.

[0017] In the above-mentioned automatic grading device for peeled veneers, the driving roller and the driven roller are both constructed in a frustum shape, a slider is slidably connected to the support plate, and the transmission wheel is rotatably connected to the slider.

[0018] In the above technical scheme, the present invention provides an automatic grading device for rotary cut veneers, which can make rotary cut veneers of different grades be adsorbed on the bottom of the belt wheel conveyor mechanism and continuously transported through the negative pressure mechanism and the belt wheel conveyor mechanism. When the rotary cut veneers move to the stacking area of ​​the corresponding grade, the first stroke of the belt wheel reduction mechanism can resist the rotary cut veneers, so that the rotary cut veneers are switched to the bottom of the belt wheel reduction mechanism for transportation, and then the second stroke of the belt wheel reduction mechanism can continue to resist the rotary cut veneers so that the rotary cut veneers fall into the stacking area of ​​the corresponding grade; in the process of switching the rotary cut veneers from the bottom of the belt wheel conveyor mechanism to the bottom of the belt wheel reduction mechanism, the conveying speed of the rotary cut veneers is reduced, that is, the horizontal offset distance of the rotary cut veneers when they fall into the stacking area is reduced, so as to avoid the rotary cut veneers from being scattered in the stacking area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a pulley speed reduction mechanism provided by yet another embodiment of the present invention;

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

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

[0024] Figure 5 A schematic diagram of a slide structure provided in yet another embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of a driving roller and a driven roller provided in yet another embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the extension structure provided in yet another embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. First synchronous wheel; 2. First synchronous belt; 3. Negative pressure tube; 31. Adsorption hole; 4. Lifting plate; 5. Second synchronous wheel; 6. Second synchronous belt; 7. Elastic member; 8. Support plate; 9. Lifting rod; 10. Connecting plate; 11. Slide plate; 111. First wedge-shaped surface; 112. Second wedge-shaped surface; 113. First horizontal plane; 114. Third wedge-shaped surface; 115. Second horizontal plane; 12. Connecting column; 13. Slide groove; 14. Limiting groove; 15. Driven roller; 16. Driving roller; 17. Transmission wheel; 18. Sliding block; 19. Through groove; 20. Extension part; 21. Synchronous rod. DETAILED DESCRIPTION

[0029] In order 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 1-7An embodiment of the present invention provides an automatic grading device for peeled veneers, comprising a pulley conveying mechanism and a negative pressure mechanism for forcing the peeled veneers to be adsorbed to the bottom of the pulley conveying mechanism, and also comprising a pulley reduction mechanism, which has a first stroke that resists the peeled veneers and forces the peeled veneers to be adsorbed to the bottom of the pulley reduction mechanism and a second stroke that resists the peeled veneers and forces the peeled veneers to fall into a stacking area, and the conveying speed of the peeled veneers in the first stroke is lower than the conveying speed in the pulley conveying mechanism.

[0031] Specifically, after production, the rotary cut veneers will be graded according to characteristics such as size or defects, and the graded rotary cut veneers will be transported by a pulley conveyor mechanism; the pulley conveyor mechanism and the negative pressure mechanism are arranged in the same direction (the two can be arranged on the same main body, the main body is not shown in the figure), when the pulley conveyor mechanism conveys rotary cut veneers of different grades, the negative pressure mechanism continues to operate to force the rotary cut veneers to be adsorbed on the bottom of the pulley conveyor mechanism; a plurality of stacking areas are arranged along the length direction of the pulley conveyor mechanism, and the plurality of stacking areas are divided into different grades to stack rotary cut veneers of corresponding grades; when the rotary cut veneer is (about to) move to the stacking area of ​​the corresponding grade with the pulley conveyor mechanism, the rotary cut veneer can be separated from the pulley conveyor mechanism by pushing the rotary cut veneer downward by a push plate, so that the rotary cut veneer loses the adsorption of the negative pressure mechanism and falls into the corresponding stacking area; the above are all existing technologies and will not be repeated here. The innovation of the embodiment of the present invention lies in that a plurality of pulley reduction mechanisms are arranged along the length direction of the pulley conveyor mechanism, and the plurality of pulley reduction mechanisms correspond to a plurality of stacking areas; the pulley reduction mechanism can select the pulley disc conveying structure in the prior art, and the pulley reduction mechanism has a first stroke and a second stroke during the downward movement, and in the first stroke, the bottom of the pulley reduction mechanism resists the peeled veneer so that the peeled veneer is switched from the bottom of the pulley conveyor mechanism to the bottom of the pulley reduction mechanism, and during the process, the negative pressure mechanism maintains the adsorption of the peeled veneer so that the peeled veneer is stably located at the bottom of the pulley reduction mechanism; in the second stroke, the pulley reduction mechanism forces the peeled veneer to continue to move downward until the gravity of the peeled veneer is greater than the adsorption force of the negative pressure mechanism, and the peeled veneer falls downward into the stacking area of ​​the corresponding level; the speed at which the pulley reduction mechanism conveys the peeled veneer is less than the speed at which the pulley conveyor mechanism conveys the peeled veneer, so that in the first stroke, the conveying speed of the peeled veneer is reduced. The advantage of such a configuration is that when the rotary cut veneers are graded and stacked, the rotary cut veneers of different grades can be driven by the pulley conveyor mechanism for continuous transportation until the rotary cut veneers move to the stacking area of ​​the corresponding grade, at which time the rotary cut veneers can be decelerated by the pulley deceleration mechanism and fall into the stacking area of ​​the corresponding grade, thereby reducing the conveying speed of the rotary cut veneers being graded without changing the conveying speed of other rotary cut veneers, thereby reducing the horizontal offset distance of the rotary cut veneers when they fall into the stacking area (when the stacking area does not have a lifting function and the rotary cut veneers have a horizontal speed, for several rotary cut veneers that fall into the same stacking area, the horizontal offset distance of the rotary cut veneers on the lower layer of the stacking area is larger, and the horizontal offset distance of the rotary cut veneers on the upper layer is smaller, which will cause the rotary cut veneers in the same stacking area to be scattered stacked), so as to avoid the rotary cut veneers from being scattered in the stacking area as much as possible.

[0032] An automatic grading device for rotary cut veneers provided in an embodiment of the present invention can enable rotary cut veneers of different grades to be adsorbed on the bottom of the belt wheel conveyor mechanism and continuously transported through a negative pressure mechanism and a belt wheel conveyor mechanism; when the rotary cut veneers move to the stacking area of ​​the corresponding grade, the first stroke of the belt wheel reduction mechanism can resist the rotary cut veneers, so that the rotary cut veneers are switched to the bottom of the belt wheel reduction mechanism for transportation; then, the second stroke of the belt wheel reduction mechanism can continue to resist the rotary cut veneers so that the rotary cut veneers fall into the stacking area of ​​the corresponding grade; in the process of switching the rotary cut veneers from the bottom of the belt wheel conveyor mechanism to the bottom of the belt wheel reduction mechanism, the conveying speed of the rotary cut veneers is reduced, that is, the horizontal offset distance of the rotary cut veneers when they fall into the stacking area is reduced, so as to avoid the rotary cut veneers from being scattered in the stacking area.

[0033] In another embodiment provided by the present invention, further, the pulley transmission mechanism includes two first synchronous wheels 1 and a first synchronous belt 2 sleeved on the two first synchronous wheels 1. The negative pressure mechanism includes a negative pressure tube 3 and a plurality of adsorption holes 31 constructed at the bottom of the negative pressure tube 3. Specifically, the two first synchronous wheels 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 wheels 1, so that when one first synchronous wheel 1 rotates, it can drive the first synchronous belt 2 and the other first synchronous wheel 1 to run synchronously (the power for driving one first synchronous wheel 1 to rotate can use the motor structure in the prior art, not shown in the figure); a vacuum pump or a centrifugal pump is provided on the negative pressure tube 3 to extract the air in the negative pressure tube 3 (the negative pressure tube 3 can be fixed on the main body), so that the multiple adsorption holes 31 are in a negative pressure state, thereby adsorbing the peeled veneer passing through; The first synchronous belt 2 is arranged along the length direction of the negative pressure tube 3, and two groups of pulley transmission mechanisms are arranged. The two groups of pulley transmission mechanisms are respectively located on both sides of the negative pressure tube 3, and the bottom wall of the negative pressure tube 3 is higher than the bottom wall of the first synchronous belt 2; when the peeled veneer is at the bottom of the first synchronous belt 2, the suction force of the negative pressure tube 3 on the peeled veneer is upward, so that the peeled veneer overcomes the gravity and contacts the bottom of the first synchronous belt 2, and with the operation of the pulley transmission mechanism, the first synchronous belt 2 conveys the peeled veneer, and during the process, a number of suction holes 31 at the bottom of the negative pressure tube 3 maintain suction on the peeled veneer, so that the peeled veneer can be conveyed stably.

[0034] Preferably, the pulley speed reduction mechanism comprises a lifting plate 4 and two second synchronous wheels 5 rotatably connected to the lifting plate 4 , and the two second synchronous wheels 5 are sleeved with a second synchronous belt 6 . Specifically, the second synchronous belt 6 is sleeved on the two second synchronous wheels 5, so that when one second synchronous wheel 5 rotates, it can drive the second synchronous belt 6 and the other second synchronous wheel 5 to rotate (the power for driving one second synchronous wheel 5 to rotate can use the motor structure in the prior art, not shown); the lifting plate 4 is located between the negative pressure tube 3 and a group of pulley transmission mechanisms, and the lifting plate 4 is slidably connected to the negative pressure tube 3 (the sliding connection structure can use the slide rail structure), and the driving force for the lifting plate 4 to slide along the negative pressure tube 3 can use the 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 arranged 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 peeled veneer at the bottom of the first synchronous belt 2; when the peeled veneer is graded and stacked, the lifting plate 4 moves downward to drive the second synchronous belt 6 to push against the peeled veneer at the bottom of the first synchronous belt 2 6, so that the peeling veneer can be stably adsorbed on the bottom of the second synchronous belt 6. This is the first stroke of the pulley reduction mechanism; the speed of the second synchronous belt 6 in transmitting the peeling veneer is lower than the speed of the first synchronous belt 2 in transmitting the peeling veneer, so that the speed of the peeling veneer is reduced after switching from the first synchronous belt 2 to the second synchronous belt 6; after the speed of the peeling veneer is reduced, the lifting plate 4 continues to descend to drive the second synchronous belt 6 to continue to resist the peeling veneer downward, so as to drive the peeling veneer to move to the stacking area of ​​the corresponding grade, until the suction force of the negative pressure tube 3 on the peeling veneer is less than the gravity of the peeling veneer, and the peeling veneer falls into the stacking area under the action of gravity, which is the second stroke of the pulley reduction mechanism; after the peeling veneer falls into the stacking area, the lifting plate 4 is reset to perform the grading and stacking operation on the next peeling veneer of the same grade.

[0035] Furthermore, an elastic member 7 is provided between the negative pressure tube 3 and the lifting plate 4. Specifically, under the action of the elastic member 7, the lifting plate 4 and the second synchronous belt 6 and other structures are at the top of their sliding stroke. When the lifting plate 4 is driven to move downward, the elastic member 7 stores elastic potential energy. After the peeled veneers are graded and stacked, the elastic member 7 assists the lifting plate 4 to reset to the top of its stroke. Preferably, a support plate 8 is fixed on the negative pressure tube 3, and 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. A connecting plate 10 is fixed on the top of the lifting rod 9. A raised structure (not shown) is constructed on the lifting rod 9, 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 member 7 is a spring in the prior art, which is sleeved on the lifting rod 9, and its two ends are respectively fixed to the lifting plate 4 and the support plate 8, so that the lifting plate 4 is forced upward to approach the support plate 8 through the spring, thereby forcing the raised structure to contact 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 solution for the electric push rod to drive the lifting plate 4 to slide along the negative pressure pipe 3, preferably, a slide plate 11 is slidably connected to the support plate 8, and the slide plate 11 is constructed with a first wedge surface 111 and a second wedge surface 112, and a connecting column 12 is provided on the connecting plate 10. Specifically, in the above embodiment, the transmission speed of the second synchronous belt 6 is lower than the transmission speed of the first synchronous belt 2, so that the peeled veneer has a deceleration effect after switching to the second synchronous belt 6. Obviously, the deceleration of the peeled veneer requires a certain amount of time. In order to ensure that the peeled veneer can be adsorbed on the bottom of the second synchronous belt 6 while decelerating, the pulley deceleration mechanism needs to pause for a while after running the first stroke and then run the second stroke. For this purpose, structures such as the slide plate 11 are provided. In the present embodiment, a linear drive mechanism is provided on the negative pressure tube 3 to drive the slide plate 11 to slide along the support plate 8. The linear drive mechanism may adopt a structure such as a cylinder or a screw 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 close to the connecting plate 10, and a first wedge surface 111 and a second wedge surface 112 are constructed at the bottom of the protrusion. A first horizontal plane 113 is formed between the first wedge surface 111 and the second wedge surface 112, and the two ends of the first horizontal plane 113 are respectively connected to the first wedge surface 111 and the second wedge surface 112; a connecting column 12 is arranged on the side of the connecting plate 10 close to the slide plate 11, and the connection between the connecting column 12 and the connecting plate 10 can be a fixed connection, and the connecting column 12 and the protrusion are mutually adapted and are both located between the slide plate 11 and the connecting plate 10. Figure 3As shown, when the slide plate 11 moves to the left at a constant speed along the slide groove 13, the first wedge surface 111 first contacts the connecting column 12 to force the connecting column 12 and the connecting plate 10 to move downward, thereby driving the pulley reduction mechanism to run the first stroke. During the process, the elastic member 7 stores elastic potential energy and forces the connecting column 12 to contact the bottom of the raised portion; then the connecting column 12 moves relatively on 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 contacts the peeled veneer and forces the peeled veneer to decelerate; until the connecting column 12 moves relatively to the position of the second wedge surface 112, The second wedge surface 112 contacts the connecting column 12 to force the connecting plate 10 to continue to move downward, thereby driving the pulley reduction mechanism to run the second stroke, so that the peeled veneer falls into the stacking area of ​​the corresponding level; the advantage of such a setting 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 surface 111 and the second wedge 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 peeled veneer has a certain time to decelerate, thereby minimizing the stability of the peeled veneer when it falls into the stacking area.

[0037] Furthermore, a third wedge-shaped surface 114 is constructed on the slide plate 11. Specifically, in the above embodiment, the linear drive mechanism drives the slide plate 11 to move in the opposite direction to drive the pulley reduction mechanism to reset. Accordingly, when the slide plate 11 is reset, the connecting column 12 passes through the second wedge-shaped surface 112 and the first horizontal surface 113 relative to the first wedge-shaped surface 111 until the first wedge-shaped surface 111 is separated from the connecting column 12. Then, the second synchronous belt 6 is reset under the action of the elastic member 7. Obviously, this reset method will cause the pulley reduction mechanism to reset delayed. For a pulley transmission mechanism that continuously conveys different levels, the pulley reduction mechanism in the first stroke or the second stroke may affect the conveying of other peeled veneers. In this embodiment, Figure 4 As shown, a third wedge surface 114 is constructed on the top of the protrusion, and the third wedge surface 114 is located on the side of the protrusion away from the first wedge surface 111. A second horizontal surface 115 is constructed on the top of the protrusion, and the two sides of the second horizontal surface 115 are respectively connected to the first wedge surface 111 and the third wedge surface 114; a limiting groove 14 is constructed on the connecting plate 10, and the connecting column 12 is hinged in the limiting groove 14. A torsion spring is arranged in the limiting groove 14 to force the connecting column 12 to contact the bottom wall of the limiting groove 14, thereby forcing the connecting column 12 and the connecting plate 10 to be in the same plane. When the connecting column 12 is subjected to an upward external force, the connecting column 12 will overcome the elastic force of the torsion spring and rotate upward, so that the connecting column 12 rotates to the top of the connecting plate 10; the effect of such a setting 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 resist the connecting column 12. During the process, the resistance force exerted on the connecting column 12 is used to force the connecting column 12 to move downward, so that the connecting column 12 can resist the bottom wall of the limiting groove 14 and force the connecting plate 10 and the pulley reduction mechanism to move downward synchronously; until the second wedge surface 112 is separated from the connecting column 12, the connecting column 12 is not restricted by the raised portion, so that the connecting plate 10 and other structures can be reset under the elastic force of the elastic member 7, so that the pulley reduction mechanism can be reset as soon as possible after completing the classification and stacking of the peeled veneers; after the pulley reduction mechanism is reset, the connecting column 12 moves to the position corresponding to the third wedge surface 114, and at this time the linear drive mechanism drives the slide plate 11 to reset (move to the right) and the The third wedge surface 114 contacts the connecting column 12, and the contact force of the third wedge surface 114 on the connecting column 12 is used to force the connecting column 12 to move upward. At this time, the connecting plate 10 and the pulley reduction mechanism have moved to the top of their travel under the action of the elastic member 7, that is, the connecting plate 10 cannot continue to move upward. At this time, the contact force of the third wedge surface 114 on the connecting column 12 will cause the connecting column 12 to overcome the elastic force of the torsion spring and deflect upward in the limiting groove 14, and then the connecting column 12 can be kept deflected through the second horizontal surface 115 until the slide plate 11 is reset, the connecting column 12 is separated from the protrusion, and the connecting column 12 is reset under the action of the torsion spring and contacts the bottom wall of the limiting groove 14 again, so that the connecting column 12 corresponds to the first wedge surface 111, which is convenient for the slide plate 11 to move again. The next peeled veneer of the same grade is graded and stacked. The advantage is that, in this embodiment, the connecting column 12 is movably connected to the connecting plate 10, and a third wedge surface 114 is provided at the same time, so that the pulley reduction mechanism can be reset in time after being forced by the slide plate 11 to run the second stroke, so as to avoid affecting the transmission of other peeled veneers on the pulley transmission mechanism as much as possible; the direction of the resistance force of the slide plate 11 on the connecting column 12 is different during the reciprocating operation, wherein the resistance forces of the first wedge surface 111, the first horizontal surface 113 and the second wedge surface 112 on the connecting column 12 are downward, so that the connecting column 12 can resist the bottom wall of the limiting groove 14 and drive the connecting plate 10 to move synchronously, and the resistance forces of the third wedge surface 114 and the second horizontal surface 115 on the connecting column 12 are upward, so that the connecting column 12 can overcome the elastic force of the torsion spring and deflect upward, so that the connecting column 12 avoids the protrusion after the pulley reduction mechanism is reset, and the interference between the protrusion and the connecting column 12 is avoided as much as possible.

[0038] In another embodiment provided by the present invention, as an alternative solution for the above-mentioned motor structure to drive a second synchronous wheel 5 to rotate, preferably, a driven roller 15 is coaxially fixed on the second synchronous wheel 5, a driving 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 connection portion is constructed on the lifting plate 4, and the driven roller 15 is rotatably connected to the first connection portion; a second connection portion is constructed on the support plate 8, and the driving roller 16 is rotatably connected to the second connection portion; the transmission wheel 17 is located between the driving roller 16 and the driven roller 15, and the friction wheels in the prior art can be selected between the three, so that friction transmission can be achieved between the driving roller 16, the driven roller 15 and the transmission wheel 17; a power source is provided on the support plate 8 to drive the driving roller 16 to rotate, and when the driving roller 16 rotates, the second synchronous wheel 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 transmit the peeled veneer. The advantage is that when the power source drives the second synchronous belt 6 to convey the peeled veneer through the drive roller 16 and other structures, the speed at which the power source drives the second synchronous belt 6 to convey is adjustable, that is, the speed at which the second synchronous belt 6 conveys the peeled veneer can be adjusted, so that after the peeled 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 peeled veneer to decelerate and move, so that the horizontal speed of the peeled veneer drops to zero after the peeled veneer moves to a specific position, thereby eliminating the influence of the horizontal speed on the peeled veneer when the peeled veneer falls into the stacking area, so that the peeled veneer can be stacked as neatly as possible.

[0039] As an alternative to the above-mentioned adjustment of the transmission rate of the second synchronous belt 6 by the power source, preferably, the driving roller 16 and the driven roller 15 are both constructed in a truncated cone shape, a slider 18 is slidably connected to the support plate 8, and the transmission wheel 17 is rotatably connected to the slider 18. Specifically, the driving roller 16 and the driven roller 15 are both constructed in a truncated cone shape (that is, the diameter of one end is larger than the diameter of the other end), the central axes of the driving roller 16 and the driven roller 15 are parallel to each other and the two are arranged opposite to each other (such as Figure 6 As shown in the figure, when the pulley transmission mechanism is between the first stroke and the second stroke (that is, when the connecting column 12 is relatively in contact with the first horizontal plane 113), the opposite sides of the transmission wheel 17 are respectively connected to the driving roller 16 and the driven roller 15 for transmission. On the contrary, when the connecting column 12 is relatively moved 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 portion of the support plate 8. The through groove 19 is arranged along the edge line of the opposite side of the driving roller 16 and the driven roller 15, and the slider 18 is slidably connected in the through groove 19. When the connecting column 12 is relatively in contact with 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 also be connected for transmission through the transmission wheel 17. The effect of such a setting is that, Figure 6As shown, when the slider 18 is on the right side of the through groove 19, the end of the driving roller 16 with a larger diameter is connected to the end of the driven roller 15 with a smaller diameter (connected via the transmission wheel 17); conversely, when the slider 18 moves to the left along the through groove 19, the end of the driving 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 driving roller 16, the movement of the slider 18 to the left along the through groove 19 can reduce the speed of the second synchronous belt 6 in conveying the peeled veneer.

[0040] If the speed difference between the first synchronous belt 2 and the second synchronous belt 6 in transmitting the peeled veneer is large, when the peeled veneer is switched from the first synchronous belt 2 to the second synchronous belt 6, the peeled veneer is easily pulled by the first synchronous belt 2 and the second synchronous belt 6, which may cause the peeled veneer to deviate, etc. For this purpose, structures such as a driving roller 16 and a transmission wheel 17 are provided. When the peeled veneer is switched from the first synchronous belt 2 to the second synchronous belt 6, the speed at which the peeled veneer is transmitted by the second synchronous belt 6 is substantially the same as the speed at which the peeled veneer is transmitted by the first synchronous belt 2, so that the peeled veneer can be switched smoothly and abut against the bottom of the second synchronous belt 6; when the pulley reduction mechanism is between the first stroke and the second stroke, the driving 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 transmission speed of the peeled veneer; until the pulley reduction mechanism runs the second stroke, the speed of the peeled veneer at the bottom of the second synchronous belt 6 approaches zero, so as to minimize the horizontal deviation of the peeled veneer when it falls into the stacking area.

[0041] Furthermore, a linkage mechanism is also included, which is used to drive 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 slot 19 can be selected from the structure of the cylinder in the prior art, so that the cylinder cooperates with the linear drive mechanism to operate synchronously, 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 configured with an extension portion 20, and the extension portion 20 is configured with a movable slot, and the slider 18 is fixed with a synchronization rod 21, and the synchronization rod 21 is located in both the through slot 19 and the movable slot. The advantage of such a setting is that when the skateboard 11 moves away from the second synchronous belt 6 along the support plate 8, the synchronization rod 21 can be forced to move synchronously through the inner wall of the movable groove. Since the setting directions of the slide groove 13 and the through groove 19 are different, the movement trajectories of the skateboard 11 and the slider 18 are different. For this reason, the movable groove is set to a long strip shape. When the synchronization rod 21 and the slider 18 are forced to move through the inner wall of the movable groove, the synchronization rod 21 can move adaptively in the movable groove to adapt to the different movement trajectories of the skateboard 11 and the slider 18. In this way, the linear drive mechanism can drive the skateboard 11 to move while driving the slider 18 along the through groove 19. The advantage is that when the linear drive mechanism drives the slide plate 11 along the slide groove 13 away from the second synchronous belt 6, the slide plate 11 can force the pulley reduction mechanism to run the first stroke and the second stroke successively, and between the first stroke and the second stroke, the connecting column 12 relatively abuts against the first horizontal plane 113; because 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 relatively on the first horizontal plane 113, the transmission wheel 17 moves between the driving roller 16 and the driven roller 15 to reduce the rotation speed of the second synchronous wheel 5, thereby gradually reducing the speed of the second synchronous transmission of the peeled 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 member 7, and 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 peeled veneers are graded and stacked, the pulley reduction mechanism is not driven by the driving roller 16, so as to avoid wasting kinetic energy as much as possible.

[0042] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that 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 above 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. An automatic grading device for peeled veneers, comprising a belt wheel transmission mechanism and a negative pressure mechanism for forcing the peeled veneers to be adsorbed to the bottom of the belt wheel transmission mechanism, It is characterized in that Also includes: The belt wheel reduction mechanism has a first stroke for resisting the peeled veneer and forcing the peeled veneer to be adsorbed on the bottom of the belt wheel reduction mechanism and a second stroke for resisting the peeled veneer and forcing the peeled veneer to fall into the stacking area. The conveying speed of the peeled veneer in the first stroke is lower than the conveying speed in the belt wheel conveying mechanism.

2. The automatic grading device for peeled veneer according to claim 1, It is characterized in that The belt wheel transmission mechanism comprises two first synchronous wheels and a first synchronous belt sleeved on the two first synchronous wheels.

3. The automatic grading device for peeled veneer according to claim 1, It is characterized in that The negative pressure mechanism comprises a negative pressure tube and a plurality of adsorption holes constructed at the bottom of the negative pressure tube.

4. The automatic grading device for peeled veneer according to claim 1, It is characterized in that The pulley speed reduction 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 automatic grading device for peeled veneer according to claim 4, It is characterized in that An elastic member is arranged between the negative pressure tube and the lifting plate.

6. The automatic grading device for peeled veneer according to claim 5, It is characterized in that A support plate is fixed on the negative pressure tube, a lifting slot 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 slot, and a connecting plate is fixed on the top of the lifting rod.

7. The automatic grading device for peeled veneer according to claim 6, It is characterized in that A sliding plate is slidably connected to the support plate, a first wedge surface and a second wedge surface are constructed on the sliding plate, and a connecting column is arranged on the connecting plate.

8. The automatic grading device for peeled veneer according to claim 7, It is characterized in that A third wedge surface is configured on the slide plate.

9. The automatic grading device for peeled veneer according to claim 6, It is characterized in that A driven roller is coaxially fixed on one of the second synchronous wheels, a driving roller is rotatably connected to the support plate, and a transmission wheel is also arranged on the support plate.

10. The automatic grading device for peeled veneer according to claim 9, It is characterized in that The driving roller and the driven roller are both constructed in a truncated cone shape, a slider is slidably connected to the support plate, and the transmission wheel is rotatably connected to the slider.

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