Automatic thickness control veneer side edge inclined grinding device for plywood production

Abstract

A veneer side edge inclined grinding device with the automatic thickness control function for plywood production comprises a conveyor and a grinder. The polisher comprises a polishing channel allowing the veneer to pass through and a polishing roller set arranged on the polishing channel and used for polishing the veneer, the polishing roller set comprises at least two sets of polishing rollers and a detection pressing roller, and the detection pressing roller detects whether the polishing thickness of the polishing roller on the front side to the veneer is the set thickness or not; and the polishing thickness of the polishing roller on the front side is adjusted according to the detected thickness. The polisher comprises a plurality of groups of alternately distributed polishing rollers and detection press rollers, the polishing thickness of the polishing rollers is increased layer by layer, layer-by-layer polishing of the side edges of the veneers is achieved, the polishing thickness is detected and adjusted in real time through the detection press rollers, the polishing uniformity and precision are ensured, the problems that the side edges of the veneers are torn and the thickness is not uniform are effectively avoided, and the production efficiency is improved. And meanwhile, the synchronous conveyor is matched with the edge pressing conveyor, so that stable movement of the veneer in the polishing process is ensured, fiber tearing and wrinkling are prevented, and the production quality and efficiency are further improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of plywood processing, and particularly relates to a veneer side beveling device with thickness automatic control for plywood production. BACKGROUND

[0002] The plywood spliced by multiple layers of veneers is formed by splicing multiple layers of veneers in the longitudinal and transverse directions, and the structure balances the stress in each direction of the board, overcomes the natural defects of wood, and has the characteristics of high strength, good stability, and difficulty in deformation and cracking. The veneers of the plywood need to be beveled at both ends, which can solve the defects such as uneven density, stress and internal pores of ordinary plywood caused by lapping, and the veneers are spliced at a specific angle after beveling, which can improve the mechanical strength of the product and meet the production requirements of high-strength and high-quality plywood.

[0003] At present, when the veneers of the plywood are beveled at both ends, a grinding belt is usually used for processing. The veneers are oriented and conveyed by a conveying belt, and are beveled after passing through the grinding belt. However, due to the differences in material properties of different veneers, and the fact that the veneers are continuously subjected to grinding action in the entire contact area of the grinding belt, the grinding degree of the veneers is inconsistent. The ideal grinding range should be controlled within about 2-3 centimeters, and the existing method is prone to cause tearing and uneven grinding thickness in the grinding area. SUMMARY

[0004] In view of the above problems, the present application aims to provide a veneer side beveling device with thickness automatic control for plywood production to at least partially solve the problems in the background art.

[0005] The technical scheme adopted by the present application is as follows: a veneer side beveling device with thickness automatic control for plywood production is provided, which comprises: a conveyor configured to convey the veneers in a horizontal direction; a grinder arranged on the conveying path of the conveyor and configured to bevel the side edges of the veneers; a controller; The grinder comprises a grinding channel through which the veneers pass and a grinding roller group arranged on the grinding channel to grind the veneers. The veneers can only move in the horizontal direction along the conveying direction in the grinding channel. The grinding roller group comprises at least two groups of grinding rollers and a detection roller. The grinding rollers and the detection roller are alternately distributed along the conveying direction of the veneers. The grinding thickness of the veneers by the grinding rollers increases layer by layer. The detection roller detects the grinding thickness of the veneers by the grinding rollers on the front side. The controller determines whether the thickness detected by the detection roller is the set thickness, and adjusts the grinding thickness of the grinding rollers on the front side according to the detected thickness.

[0006] Further, the axis of the polishing roller is arranged obliquely to the side edge of the veneer, the polishing roller and the detection pressure roller are both arranged as tapered rollers, the height of the detection pressure roller in the polishing channel is a set height, and the polishing roller is configured to be driven to adjust the height in the polishing channel, so that the maximum polishing height of the polishing roller is the same as the height of the detection pressure roller.

[0007] Further, the polisher comprises an upper box body and a lower box body, the upper box body is arranged above the lower box body, the polishing channel is arranged between the upper box body and the lower box body, the inside of the upper box body has a polishing compartment for accommodating the polishing roller set, the top surface of the lower box body is provided with a first dust exhaust window, the veneer slides through the polishing channel from the upper side of the first dust exhaust window, the inside of the lower box body is provided with a first air suction compartment corresponding to the lower side of the first dust exhaust window, and the outer wall of the lower box body is provided with a first negative pressure pipe in communication with the first air suction compartment.

[0008] Further, the inside of the upper box body is provided with two air suction boxes, the air suction boxes are arranged at the entrances and exits of the polishing channel respectively, the side of the air suction box facing the polishing channel is provided with a second dust exhaust window, the veneer slides through the polishing channel from the lower side of the second dust exhaust window, the inside of the air suction box is provided with a second air suction compartment corresponding to the upper side of the second dust exhaust window, and the outer side wall of the air suction box is provided with a second negative pressure pipe in communication with the second air suction compartment.

[0009] Further, the polishing roller comprises a first polishing roller, a second polishing roller and a third polishing roller, the detection pressure roller comprises a first detection pressure roller and a second detection pressure roller, the thickness of the veneer is set as H, the maximum polishing height of the first polishing roller is 1 / 3H, the maximum polishing height of the second polishing roller is 2 / 3H, the maximum polishing height of the third polishing roller is H, the height of the second detection pressure roller is 1 / 3H, and the height of the third polishing roller is 2 / 3H.

[0010] Further, the surface roughness of the third polishing roller is smaller than that of the first polishing roller and the second polishing roller.

[0011] Further, the polisher is configured as two groups and is distributed on both sides of the veneer, a synchronous conveyor is arranged between the two groups of polishers, the front and rear sides of the synchronous conveyor are both provided with the conveyors, the synchronous conveyor comprises a synchronous conveying table and a synchronous conveying belt, the synchronous conveying table is located between the two groups of conveyors, the synchronous conveying belt is arranged above the synchronous conveying table and is configured to drive the veneer to move in the conveying direction, and the conveying speed of the synchronous conveying belt is consistent with the conveying speed of the conveyors.

[0012] Further, the width direction is perpendicular to the single board conveying direction, the width of the synchronous conveying table is less than the width of the single board, and the synchronous conveying table is provided with the edge pressing conveyors on both sides in the width direction, the edge pressing conveyors include the edge pressing conveying belts distributed on the upper and lower sides of the single board, and the conveying speed of the edge pressing conveying belts is consistent with the conveying speed of the synchronous conveying belts.

[0013] Further, the width of the side edge of the single board in the polishing channel is 2-3 cm, and the width of the edge pressing conveying belt is greater than 5 cm.

[0014] Further, the bottom of the conveyors, the polisher and the synchronous conveyors is provided with the supports, the supports are used for supporting the conveyors, the polisher and the synchronous conveyors, the top surface of the conveyors is located on the same horizontal plane as the top surface of the synchronous conveying table, the gap thickness between the two groups of edge pressing conveying belts is equal to the thickness of the single board, and the lower end surface of the polishing channel is located on the same plane as the upper end surface of the conveyors.

[0015] Beneficial effects: The polisher provided in the application includes a plurality of groups of alternately distributed polishing rollers and detection pressing rollers, the polishing thickness of the polishing rollers is increased layer by layer, the side edge of the single board is polished layer by layer, the polishing thickness is detected and adjusted in real time through the detection pressing rollers, the uniformity and precision of polishing are ensured, the problems of tearing and uneven thickness of the side edge of the single board are effectively avoided, the cooperation of the synchronous conveyors and the edge pressing conveyors ensures the stable movement of the single board during polishing, prevents the tearing and folding of fibers, and further improves the production quality and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A perspective structural schematic view of a single board side edge inclined polishing device with thickness automatic control for plywood production is provided for the embodiment of the application; Figure 2 An internal structure schematic view is provided for the embodiment of the application; Figure 3 A perspective structural schematic view of a single board side edge inclined polishing device with thickness automatic control for plywood production is provided for the embodiment of the application; Figure 2 A sectional view structural schematic view in the direction of A-A; Figure 4 A perspective structural schematic view of a single board side edge inclined polishing device with thickness automatic control for plywood production is provided for the embodiment of the application; Figure 2 A sectional view structural schematic view in the direction of B-B; Figure 5 An internal structure schematic view of the polisher is provided for the embodiment of the application.

[0017] Wherein, 01, support; 10, conveyor; 20, sander; 200, sanding channel; 201, sanding bin; 202, first suction bin; 203, second suction bin; 21, upper box body; 210, sanding roller set; 211, first sanding roller; 212, first detection compression roller; 213, second sanding roller; 214, second detection compression roller; 215, third sanding roller; 22, lower box body; 221, first dust removal window; 222, first negative pressure pipe; 23, suction box; 231, second dust removal window; 232, second negative pressure pipe; 30, synchronous conveyor; 31, synchronous conveying table; 32, synchronous conveying belt; 40, edge pressing conveyor; 41, edge pressing conveying belt.

[0018] The accompanying drawings are used to provide a further understanding of the embodiments, and constitute a part of the specification, which are used to explain the embodiments together with the embodiments, and do not constitute a limitation on the embodiments. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection.

[0020] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments.

[0021] The present application provides a kind of veneer production with thickness automatic control's single board side edge beveling device, to improve the polishing quality of single board side edge, the device mainly includes conveyor 10, sander 20 and controller.

[0022] As shown in Figure 1 , Figure 3 and Figure 4 , conveyor 10 is configured to convey single board in horizontal direction, sander 20 is arranged on the conveying path of conveyor 10 and performs beveling on the side edge of single board, and sander 20 includes sanding channel 200 for single board to pass through. After the side edge of single board enters sanding channel 200, it is polished by internal sanding roller set 210, so that the side edge of single board forms bevel.

[0023] The polishing device 20 is configured in two groups and distributed on both sides of the veneer, which can polish the side edges of both sides of the veneer at an angle. In order to keep the veneer stable during polishing, the veneer will not crack due to movement, and a synchronous conveyor 30 is arranged between the two groups of polishing devices 20.

[0024] Further, along the conveying direction of the veneer, the front and rear sides of the synchronous conveyor 30 are provided with conveyors 10. The synchronous conveyor 30 includes a synchronous conveying table 31 and a synchronous conveying belt 32. The synchronous conveying table 31 is located between the two groups of conveyors 10, and the synchronous conveying belt 32 is arranged above the synchronous conveying table 31 and is configured to drive the veneer to move in the conveying direction. The conveying speed of the synchronous conveying belt 32 is consistent with the conveying speed of the conveyor 10.

[0025] In some embodiments, the two conveyors 10 arranged in front and back can adopt a roller belt type conveying device. The veneer is horizontally placed on the conveying belt, and the veneer is stably conveyed by the conveying belt. Generally, the width of the conveying belt is greater than the width of the veneer, and a limiting mechanism is configured so that the veneer can move along the preset path on the conveying belt until it is conveyed into the polishing channel 200. The synchronous conveyor 30 is arranged between the two groups of polishing devices 20, and the conveying speed of the synchronous conveyor 30 is consistent with the conveying speed of the conveyor 10. When part of the veneer enters the polishing channel 200, the middle part of the veneer is also driven to move by the synchronous conveying belt 32. The lower side of the veneer slides on the synchronous conveying table 31, and the upper side of the veneer is driven to move by the synchronous conveying belt 32, which can ensure that the veneer always moves at a set speed during polishing, avoiding wrinkles and other situations, thereby reducing the occurrence of cracking during side edge polishing.

[0026] Further, the width direction is perpendicular to the conveying direction of the veneer. The width of the synchronous conveying table 31 is less than the width of the veneer, and the two sides of the synchronous conveying table 31 along the width direction are provided with edge pressing conveyors 40. The edge pressing conveyor 40 includes edge pressing conveying belts 41 distributed on the upper and lower sides of the veneer. The conveying speed of the edge pressing conveying belt 41 is consistent with the conveying speed of the synchronous conveying belt 32.

[0027] As shown in Figure 1 and Figure 4 , the edge pressing conveying belt 41 is distributed on the upper and lower sides of the veneer, and the edge pressing conveying belt 41 is also arranged in two groups. Inside the side edge of the veneer during polishing, the edge pressing conveying belt 41 can tightly press on the upper and lower sides of the veneer surface, keeping the fibers between the veneer in the polishing area bound, avoiding tearing of the veneer surface fibers due to friction during polishing, thereby reducing the possibility of tearing and cracking of the veneer side edge fibers, and aiming to maintain the integrity of the veneer surface to improve the splicing quality during subsequent veneer lapping.

[0028] Further, the width of the side edge of the single board in the polishing channel 200 is 2-3 cm, and the width of the edge pressing conveying belt 41 is greater than 5 cm, wherein the relative proportion of the area where the side edge of the single board is pressed by the edge pressing conveying belt 41 is large, and the relative proportion of the polishing area is small, so in this case, the fibers in the side edge area of the single board are mostly fixed, and only in the case of edge polishing, it is not easy to crack.

[0029] As shown in Figure 1 and Figure 2 , the bottom of the conveyor 10, the polisher 20 and the synchronous conveyor 30 is provided with a support 01, which is used to support the conveyor 10, the polisher 20 and the synchronous conveyor 30, so that the top surface of the conveyor 10 and the top surface of the synchronous conveying table 31 are located in the same horizontal plane, the gap thickness between the two groups of edge pressing conveying belts 41 is equal to the thickness of the single board, and the lower end surface of the polishing channel 200 is in the same plane with the upper end surface of the conveyor 10.

[0030] In some embodiments, the support 01 adopts profile splicing to form a stable frame structure, which is used to support the conveyor 10, the polisher 20 and the synchronous conveyor 30 to keep stable during work, so that the single board conveyed on the top surface of the conveyor 10 can be directly moved into the polishing channel 200 on the polisher 20, at the same time, the synchronous conveying table 31 is also used to receive and convey the middle area of the single board, ensuring that the single board is always in the same plane during conveying, providing a basis for the stability of side edge polishing.

[0031] As shown in Figure 4 and Figure 5 , the polisher 20 includes a polishing channel 200 for the single board to pass through and a polishing roller group 210 arranged on the polishing channel 200 to polish the single board, the single board can only move in the horizontal direction along the conveying direction in the polishing channel 200, the polishing roller group 210 includes at least two groups of polishing rollers and detection pressing rollers, the polishing rollers and the detection pressing rollers are alternately distributed along the conveying direction of the single board, the polishing thickness of the single board by the plurality of polishing rollers increases layer by layer, the detection pressing roller detects the polishing thickness of the single board by the polishing roller in front, and the controller judges whether the thickness detected by the detection pressing roller is a set thickness, and adjusts the polishing thickness of the polishing roller in front according to the detected thickness.

[0032] Although the size of the single board is relatively thin (generally 3.5mm-6.5mm), when the current common way of beveling the single board with a polishing belt is used (i.e. the grinding amount is the thickness of the single board), it is easy to cause tearing and uneven polishing thickness in the polishing area. Therefore, the present scheme uses multiple polishing rollers to polish the side edge area of the single board in a way that each polishing roller polishes a set thickness, and the polishing thickness is gradually deepened layer by layer to realize the beveling of the side edge of the single board. However, due to the thin thickness of the single board, the single grinding amount is even less than 1mm. Since the polishing roller will wear during the polishing process, the grinding amount needs to be accurately determined. Therefore, a detection pressure roller is arranged at the rear side of the polishing roller to detect whether the polishing thickness of the polishing roller on the single board is the set thickness, so as to ensure the grinding amount of each layer to meet the design requirements and realize the layer-by-layer grinding of the single board, thereby ensuring the grinding quality and making the side edge beveling quality of the single board uniform and without causing tearing of the side edge.

[0033] Further, in order to reduce the frictional resistance of the polishing roller perpendicular to the fiber direction of the board surface when it contacts the single board, the axis of the polishing roller is inclined to the side edge of the single board, generally at forty-five degrees, and the polishing roller and the detection pressure roller are both arranged as conical rollers. When the conical polishing roller contacts the side edge of the single board, the grinding amount of the edge area is larger, while the grinding amount of the middle area is relatively smaller, so that the side edge of the polished single board presents a bevel structure, which facilitates the subsequent staggered assembly of the single board to improve the mechanical strength of the board.

[0034] Further, the height of the detection pressure roller in the polishing channel 200 is a set height, and the polishing roller is configured to be driven to adjust the height in the polishing channel 200, so that the maximum polishing height of the polishing roller is the same as the height of the detection pressure roller. The height adjustment of the polishing roller can be achieved by driving the polishing roller to rise and fall through a high-precision screw transmission mechanism driven by a stepping motor. The driving information of the stepping motor comes from the height information detected by the detection pressure roller. The detection pressure roller is internally configured with a pressure sensor to feedback the grinding amount of the polishing roller by detecting the pressure of the contact between the detection pressure roller and the board surface. If the pressure of the detection pressure roller increases, it reflects that the grinding amount of the polishing roller decreases, and the height position of the polishing roller needs to be adjusted so that the grinding amount of the polishing roller meets the design requirements.

[0035] In some embodiments, the polishing roller includes a first polishing roller 211, a second polishing roller 213 and a third polishing roller 215, and the detection pressure roller includes a first detection pressure roller 212 and a second detection pressure roller 214. The thickness of the single board is H, the maximum polishing height of the first polishing roller 211 is 1 / 3H, the maximum polishing height of the second polishing roller 213 is 2 / 3H, the maximum polishing height of the third polishing roller 215 is H, the height of the first detection pressure roller 212 is 1 / 3H, and the height of the second detection pressure roller 214 is 2 / 3H.

[0036] Thus, during working, the veneer with a thickness of H is ground by the first grinding roller 211 by a thickness of 1 / 3H, then the first detection pressure roller 212 detects whether the grinding thickness of the first grinding roller 211 is 1 / 3H, if the pressure of the first detection pressure roller 212 increases, it reflects that the grinding amount of the first grinding roller 211 decreases, the height position of the first grinding roller 211 needs to be adjusted, so that the grinding amount of the first grinding roller 211 reaches 1 / 3H, and the subsequent second grinding roller 213 continues to grind, so that the grinding amount of the veneer board surface is 2 / 3H, and finally the third grinding roller 215 grinds the grinding amount of H, and completes the layer-by-layer grinding of the side edge of the veneer.

[0037] Further, the surface roughness of the third grinding roller 215 is smaller than that of the first grinding roller 211 and the second grinding roller 213, so that the surface roughness of the first two first grinding rollers 211 and the second grinding roller 213 is relatively large, which can provide strong grinding performance, and grind off the material of the set height on the veneer surface, and the surface roughness of the third grinding roller 215 on the rear side is relatively small, which can polish the inclined surface of the veneer after grinding, so that the roughness of the inclined surface is smoother, so as to improve the subsequent splicing quality of the veneer.

[0038] As shown in Figure 5 The grinder 20 includes an upper box body 21 and a lower box body 22, the upper box body 21 is arranged above the lower box body 22, and a grinding channel 200 is arranged between the upper box body 21 and the lower box body 22.

[0039] The inside of the upper box body 21 has a grinding warehouse 201 accommodating the grinding roller group 210, the top surface of the lower box body 22 is provided with a first dust discharge window 221, the veneer slides through the grinding channel 200 from the upper surface of the first dust discharge window 221, the inside of the lower box body 22 is provided with a first air suction warehouse 202 below the first dust discharge window 221, and the outer wall of the lower box body 22 is provided with a first negative pressure pipe 222 in communication with the first air suction warehouse 202. The first negative pressure pipe 222 is in communication with an external negative pressure device.

[0040] When the veneer passes through the grinding channel 200, the negative pressure air suction in the first dust discharge window 221 below the grinding channel 200 will suck the debris generated in the veneer side grinding process into the first air suction warehouse 202, and then be pumped to the external negative pressure device through the first negative pressure pipe 222. The board surface of the veneer side grinding area can be kept clean, the debris attached to the board surface can be avoided to affect the grinding effect, and the working environment can be kept clean and tidy.

[0041] Further, in order to side suction of the wood dust and other impurities attached on the surface of the single board, the inside of the box body 21 is provided with two air suction boxes 23, the air suction boxes 23 are respectively arranged at the entrance and exit sides of the polishing channel 200, the side of the air suction boxes 23 facing the polishing channel 200 is provided with a second dust discharge window 231, the single board slides through the polishing channel 200 from the lower side of the second dust discharge window 231, the inside of the air suction box 23 is provided with a second air suction chamber 203 corresponding to the upper side of the second dust discharge window 231, the outer side wall of the air suction box 23 is provided with a second negative pressure pipe 232 in communication with the second air suction chamber 203, the second negative pressure pipe 232 is in communication with the external negative pressure device, when the upper side of the single board passes through the air suction box 23, the negative pressure airflow in the air suction box 23 will suction and discharge all the impurities on the upper side of the single board.

[0042] It is to be noted that the relative terms such as first and second, and the like are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] The above describes the embodiments, which is not limited, and the drawings only show one of the embodiments, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the creative purpose, without creative design, similar structure and embodiments of the technical solution can be designed, which shall belong to the protection scope.

Claims

1. A veneer side beveling grinding device with automatic thickness control for plywood production, characterized in that, include: Conveyor (10), configured to convey veneers in a horizontal direction; A grinder (20) is set on the conveying path of the conveyor (10) and performs beveling on the side of the veneer; Controller; The polisher (20) includes a polishing channel (200) for the single board to pass through and a polishing roller group (210) arranged on the polishing channel (200) to polish the single board. The single board can only move horizontally along the conveying direction within the polishing channel (200). The polishing roller group (210) includes at least two sets of polishing rollers and detection pressure rollers. The polishing rollers and detection pressure rollers are alternately distributed along the conveying direction of the single board. The polishing thickness of the single board by the multiple polishing rollers increases layer by layer. The detection pressure roller detects the polishing thickness of the single board by the polishing rollers on the front side. The controller determines whether the thickness detected by the detection pressure roller is the set thickness and adjusts the polishing thickness of the polishing rollers on the front side according to the detected thickness.

2. The veneer side beveling device for automatic thickness control in plywood production according to claim 1, characterized in that: The axis of the grinding roller is inclined to the side of the single board. Both the grinding roller and the detection pressure roller are set as tapered rollers. The height of the detection pressure roller in the grinding channel (200) is a set height. The grinding roller is configured to be driven to adjust its height in the grinding channel (200) so that the maximum grinding height of the grinding roller is the same as the height of the detection pressure roller.

3. The veneer side beveling device for automatic thickness control in plywood production according to claim 1, characterized in that: The polisher (20) includes an upper box (21) and a lower box (22). The upper box (21) is located above the lower box (22). A polishing channel (200) is provided between the upper box (21) and the lower box (22). The interior of the upper box (21) has a polishing chamber (201) for accommodating the polishing roller assembly (210). The top surface of the lower box (22) is provided with a first dust exhaust window (221). The single board slides through the polishing channel (200) from the upper side of the first dust exhaust window (221). The interior of the lower box (22) is provided with a first exhaust chamber (202) below the first dust exhaust window (221). The outer wall of the lower box (22) is provided with a first negative pressure pipe (222) that communicates with the first exhaust chamber (202). The first negative pressure pipe (222) is connected to an external negative pressure device.

4. The veneer side beveling device for automatic thickness control in plywood production according to claim 3, characterized in that: The upper box (21) is provided with two exhaust boxes (23) inside. The exhaust boxes (23) are respectively located on the inlet and outlet sides of the polishing channel (200). The exhaust box (23) is provided with a second dust window (231) on the side facing the polishing channel (200). The single board slides through the polishing channel (200) from the lower side of the second dust window (231). The exhaust box (23) is provided with a second exhaust chamber (203) inside corresponding to the upper part of the second dust window (231). The outer wall of the exhaust box (23) is provided with a second negative pressure pipe (232) communicating with the second exhaust chamber (203). The second negative pressure pipe (232) is connected to an external negative pressure device.

5. The veneer side beveling device for automatic thickness control in plywood production according to claim 2, characterized in that: The polishing rollers include a first polishing roller (211), a second polishing roller (213), and a third polishing roller (215). The detection rollers include a first detection roller (212) and a second detection roller (214). The thickness of the single board is set to H. The maximum polishing height of the first polishing roller (211) is 1 / 3H, the maximum polishing height of the second polishing roller (213) is 2 / 3H, the maximum polishing height of the third polishing roller (215) is H, the height of the second detection roller (214) is 1 / 3H, and the height of the third polishing roller (215) is 2 / 3H.

6. The veneer side beveling device for automatic thickness control in plywood production according to claim 5, characterized in that: The surface roughness of the third grinding roller (215) is less than that of the first grinding roller (211) and the second grinding roller (213).

7. The veneer side beveling device for automatic thickness control in plywood production according to claim 1, characterized in that: The polishing devices (20) are configured in two sets and distributed on both sides of the single board. A synchronous conveyor (30) is provided between the two sets of polishing devices (20). Along the conveying direction of the single board, the synchronous conveyor (30) is provided with conveyors (10) on both the front and rear sides. The synchronous conveyor (30) includes a synchronous conveying table (31) and a synchronous conveyor belt (32). The synchronous conveying table (31) is located between the two sets of conveyors (10). The synchronous conveyor belt (32) is located above the synchronous conveying table (31) and is configured to drive the single board to move along the conveying direction. The conveying speed of the synchronous conveyor belt (32) is the same as the conveying speed of the conveyor (10).

8. The veneer side beveling device for automatic thickness control in plywood production according to claim 7, characterized in that: The width direction is defined as perpendicular to the conveying direction of the single board. The width of the synchronous conveying table (31) is smaller than the width of the single board. Both sides of the synchronous conveying table (31) along the width direction are provided with edge pressing conveyors (40). The edge pressing conveyor (40) includes edge pressing conveyor belts (41) distributed on the upper and lower sides of the single board. The conveying speed of the edge pressing conveyor belt (41) is the same as the conveying speed of the synchronous conveyor belt (32).

9. The veneer side beveling device for automatic thickness control in plywood production according to claim 8, characterized in that: The width of the side of the single board within the grinding channel (200) is 2-3 cm, and the width of the pressing conveyor belt (41) is greater than 5 cm.

10. The veneer side beveling device for automatic thickness control in plywood production according to claim 8, characterized in that: The bottom of the conveyor (10), the polisher (20) and the synchronous conveyor (30) are all provided with a bracket (01). The bracket (01) is used to support the conveyor (10), the polisher (20) and the synchronous conveyor (30), so that the top surface of the conveyor (10) and the top surface of the synchronous conveyor (31) are on the same horizontal plane. The gap thickness between the two sets of pressing conveyor belts (41) is equal to the thickness of the veneer. The lower end face of the polishing channel (200) and the upper end face of the conveyor (10) are on the same plane.

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