A plywood gluing system and processing system

Abstract

The utility model relates to a plywood gluing system and processing system belong to plywood processing technical field, the utility model discloses a roller type glue spreader and curing agent spraying subassembly, curing agent spraying subassembly set up in the front end process of roller type glue spreader, curing agent spraying subassembly includes curing agent storage tank, delivery pump and curing agent spraying equipment, delivery pump is connected between curing agent storage tank and spraying equipment through the pipeline, curing agent spraying equipment is atomizing spray head or curing agent roller subassembly, the utility model discloses a curing agent spraying subassembly is set up on the front end board conveying process of roller type glue spreader, and the curing agent water solution is sprayed to the board surface through curing agent spraying subassembly before gluing, and curing agent and binder can be mixed in the plywood gluing process without mixing glue in advance, effectively solve the need first curing agent and binder mixed cause's adhesive hardening and the influence of adhesive hardening to gluing operation.

Description

Technical Field

[0001] This utility model belongs to the field of plywood processing technology, specifically, it relates to a plywood gluing system and processing system. Background Technology

[0002] In the processing of plywood or multi-layer solid wood boards, urea-formaldehyde resin or phenolic resin adhesives (urea-formaldehyde resin, modified urea-formaldehyde resin, phenolic resin, white glue, etc.) are typically used. Both urea-formaldehyde and phenolic resin adhesives require the addition of a curing agent to improve the performance of the plywood or multi-layer solid wood board, increase the hardness of the adhesive, and reduce the amount of adhesive used, thus lowering processing costs. Adding acidic curing agents (inorganic acids such as hydrochloric acid, sulfuric acid, phosphoric acid, and nitric acid; or organic acids such as oxalic acid, malonic acid, ethylene acetic acid, benzenesulfonic acid, and nitroethyl ether; or acidic salts such as ammonium chloride, ammonium phosphate, and ammonium sulfate) to the adhesive can improve the strength and performance of the cured resin. However, adding acidic curing agents can cause the adhesive to cure prematurely.

[0003] In plywood processing, mixing the adhesive and hardener is typically an intermittent process; that is, one batch of adhesive is used up before the next batch is mixed. The addition of acidic hardeners accelerates the curing of the adhesive, causing any unused or residual adhesive in the next batch to harden easily. Since plywood processing is usually done in batches, if production stops after a batch is completed, the remaining adhesive hardens significantly over time. Once hardened, the adhesive is difficult to clean, greatly impacting the plywood application process and resulting in adhesive waste.

[0004] Moreover, existing glue application mainly uses roller-type glue applicators. These machines have glue storage tanks at the bottom and use rollers to apply the mixed glue to the wood boards. The mixed glue tends to harden on the roller surface. Once hardened glue lumps appear on the roller, it will cause uneven glue application or even make it impossible to apply glue, which will greatly affect the glue application operation. Utility Model Content

[0005] To overcome the problems existing in the background technology, this utility model provides a plywood gluing system and a plywood processing system including the gluing system. By setting a hardener spraying component at the front board conveying process of the roller gluing machine, the hardener spraying component sprays a hardener aqueous solution onto the board surface before gluing. The hardener and adhesive can be mixed during the board gluing process without pre-mixing the glue, which effectively solves the problem of adhesive hardening caused by the need to mix the hardener and adhesive first, and the impact of adhesive hardening on the gluing operation.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] The plywood gluing system includes a roller-type glue applicator and a curing agent spraying assembly; the curing agent spraying assembly is located at the front end of the roller-type glue applicator; the curing agent spraying assembly includes a curing agent storage tank, a delivery pump, and a curing agent spraying device; the delivery pump is connected between the curing agent storage tank and the spraying device via a pipeline; the curing agent spraying device is an atomizing nozzle or a curing agent roller assembly.

[0008] Preferably, the plywood gluing system further includes a roller conveyor belt, which is located at the front end of the roller glue applicator; the curing agent spraying equipment is an atomizing nozzle; the atomizing nozzles are respectively located above and below the roller conveyor belt.

[0009] Preferably, the atomizing assembly further includes a nozzle box, and the atomizing nozzle is disposed inside the nozzle box; the side of the nozzle box facing the roller conveyor belt is open, and the spray nozzle is positioned facing the roller conveyor belt.

[0010] Preferably, the curing agent spraying assembly is a curing agent roller assembly; the curing agent roller assembly includes an upper roller, a lower roller, an upper water tank, a lower water tank, an upper suction roller, and a lower suction control roller; the outlet pipe of the delivery pump is connected to the upper water tank; the upper suction roller is partially submerged in the curing agent liquid surface of the upper water tank; the lower roller is partially submerged in the curing agent liquid surface of the lower water tank; the upper roller and the lower roller rotate in counter-current; the upper roller and the upper suction roller are tangential or maintain a 2-3 mm gap; the lower roller and the lower suction control roller are tangential or maintain a 2-3 mm gap.

[0011] Preferably, the upper water tank is provided with an overflow pipe that connects to the lower water tank; the lower water tank is provided with a liquid level sensor.

[0012] Preferably, the liquid level sensor includes an upper liquid level sensor and a lower liquid level sensor; the upper liquid level sensor and the lower liquid level sensor are respectively connected to the controller of the delivery pump.

[0013] Preferably, the upper suction roller is also equipped with an upper suction control roller that is tangent to it or has a gap of 2-3 mm, and the upper suction control roller is higher than the liquid surface of the upper water tank.

[0014] Preferably, the upper liquid suction control roller, the upper liquid suction roller, and the lower liquid suction control roller are each provided with a spacing adjustment assembly at both ends; the spacing adjustment assembly includes an outer spherical bearing fixing seat, a clamping screw, and an adjusting screw; the bracket is provided with a clamping screw hole and an adjusting screw hole, the adjusting screw hole being horizontally opened; the clamping screw and the adjusting screw pass through the clamping screw hole and the adjusting screw hole respectively and abut against the outer edge of the outer spherical bearing fixing seat.

[0015] Preferably, the upper glue roller, the upper liquid suction control roller, and the lower liquid suction control roller rotate clockwise; the lower glue roller and the upper liquid suction roller rotate counterclockwise.

[0016] The plywood processing system includes the aforementioned plywood gluing system, and further includes a board laying machine, a cold press, a top-coating machine, a hot press, and an edge saw, which are arranged sequentially after the curing agent spraying assembly.

[0017] The beneficial effects of this utility model are:

[0018] The plywood gluing system of this utility model sets up a curing agent spraying component in the front-end process of the roller gluing machine. The curing agent spraying component sprays or coats the upper and lower surfaces of the wood board with a curing agent aqueous solution. It eliminates the need to premix the curing agent and adhesive, effectively solving the problem of adhesive hardening caused by adding curing agent in advance and the impact of adhesive hardening on the gluing operation.

[0019] This invention uses a curing agent spraying component to spray a curing agent aqueous solution onto wood boards. This solves the problem of curing agent affecting the gluing process, while also addressing issues such as incomplete pre-pressing due to lack of water in overly dry wood boards, tearing of the panel during secondary gluing, rapid glue drying, and severe glue penetration. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the plywood gluing system of Embodiment 1 of this utility model;

[0021] Figure 2 This is a schematic diagram of the plywood processing system of Embodiment 2 of this utility model;

[0022] Figure 3 This is a schematic diagram of the curing agent roller assembly structure of Embodiment 3 of this utility model (view 1);

[0023] Figure 4 This is a schematic diagram of the curing agent roller assembly structure of Embodiment 3 of this utility model (view 2);

[0024] Figure 5 This is a schematic diagram of the curing agent roller assembly structure of Embodiment 3 of this utility model (view 3);

[0025] Figure 6 This is a schematic diagram of the curing agent roller assembly structure of Embodiment 3 of this utility model (viewpoint four);

[0026] Figure 7 yes Figure 6 Enlarged view of a portion at point A;

[0027] Remark: Figure 1 and 2 In the diagram, solid lines represent the direction of processing and conveying the wood board, while dashed lines represent the direction of conveying the adhesive or curing agent solution.Figure 6 The middle arrow indicates the direction of the wooden plank transport;

[0028] In the diagram, 1-roller glue applicator, 2-hardener storage tank, 3-roller conveyor belt, 4-nozzle box, 5-pump, 6-board laying machine, 7-cold press, 8-top glue applicator, 9-hot press, 10-edge saw, 11-glue mixing machine A, 12-glue mixing machine B, 20-wood board, 21-mixer, 22-top glue roller, 23-bottom glue roller, 24-top liquid suction control roller, 25-top water tank, 26-bottom water tank, 27-top liquid suction roller, 28-bottom liquid suction control roller, 29-overflow pipe, 30-outer spherical bearing mounting seat, 31-clamping screw, 32-adjusting screw, 33-bracket, 34-motor, 35-gear, 36-chain. Detailed Implementation

[0029] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0030] In the description of this utility model, unless otherwise stated, the terms "upper", "lower", "left", "right", etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0032] A plywood gluing system, such as Figure 1 As shown, the plywood gluing system includes a roller-type glue applicator 1, a hardener spraying assembly, and a roller-type conveyor belt 3.

[0033] The roller-type glue applicator 1 is an existing structure, a convection roller glue applicator with a glue storage tank. The lower roller section is immersed in the adhesive in the glue storage tank, and the wood board is coated with adhesive as it passes through the convection roller. The roller-type glue applicator 1 is also equipped with a glue mixing machine A11 with a stirrer 21. Phenolic resin and other materials are first added to the glue mixing machine A11 for mixing and stirring before being added to the glue storage tank.

[0034] A hardener spraying assembly is installed on the front roller conveyor belt 3 of the roller-type glue applicator 1. The hardener spraying assembly includes a delivery pump 5, an atomizing nozzle, a hardener storage tank 2, and a nozzle box 4. The delivery pump 5 is connected between the atomizing nozzle and the hardener storage tank 2 through a pipeline to provide atomization pressure to the atomizing nozzle. The spray volume of the atomizing nozzle can be adjusted according to the needs of wood processing. The spray volume can be adjusted by any method, such as using a frequency converter pump for the delivery pump 5, installing a regulating valve on the water inlet pipe of the atomizing nozzle, or adjusting the number of nozzles, etc.

[0035] Two nozzle boxes 4 are provided, one above and one below the roller conveyor belt 3, respectively. They spray the hardener onto the upper and lower surfaces of the wooden boards conveyed by the roller conveyor belt 3. The nozzle box 4 is an open shell structure with the side facing the roller conveyor belt 3 open; its main function is to reduce the diffusion of the hardener aqueous solution sprayed from the atomizing nozzles. The atomizing nozzles are located inside the nozzle box 4, with their spray nozzles facing the roller conveyor belt 3. Since the acidic hardener aqueous solution is acidic, its dispersion into the air will pollute the environment and affect the occupational health of operators. The nozzle box 4 reduces the impact of the acidic hardener solution on the environment and operators.

[0036] This invention allows for the application of a curing agent aqueous solution onto the wood board 20 before gluing, eliminating the need for pre-mixing the acidic curing agent and adhesive. This ensures that both the acidic curing agent and adhesive are evenly applied to both sides of the wood board. It should be noted that when using a roller-type gluing machine 1 to apply glue to the upper and lower surfaces of the wood board, the roller-type gluing machine 1 rubs and rolls against the wood board surface. This frictional rolling mixes the curing agent and adhesive simultaneously with the gluing process. Furthermore, because the adhesive layer on the composite board is relatively thin, even if the curing agent and adhesive are not mixed evenly during the gluing process, they can be mixed evenly during the subsequent hot-pressing process.

[0037] This invention, by incorporating a curing agent spraying component, eliminates the need for pre-mixing the curing agent and adhesive. The curing agent is sprayed onto the wood board before applying the adhesive, ensuring the strength of the cured adhesive while avoiding the negative impact of pre-adding the curing agent. Since its implementation, this invention has not encountered any issues with adhesive curing or curing on the roller-type glue applicator. The solution of this invention not only ensures the uniformity of glue application to the wood board but also guarantees the strength and performance of the cured resin adhesive while preventing the resin adhesive from curing prematurely.

[0038] The curing agent storage tank 2 contains an aqueous solution of acidic curing agent.

[0039] In addition, as an optional solution, the hardener storage tank 2 can also hold water. In dry climates or seasons (such as autumn and winter in Kunming), the moisture content of the wood panels decreases. When the wood panels are too dry (i.e., the moisture content of individual panels is too low), problems such as incomplete pre-pressing, tearing of the panels during secondary gluing, rapid glue drying, and severe glue seepage can occur, leading to delamination, cracking, and separation of the plywood product. Current solutions to this problem are: first, to store the veneers for an extended period to rehydrate them, which typically takes about a month and is time-consuming; second, to increase the amount of glue applied. However, this increases adhesive consumption, and excessive glue application can lower the bonding strength between the wood panels, even causing the plywood to separate and resulting in defective products. Spraying water onto the surface of the wood panels can increase the moisture content of individual panels, avoiding or reducing problems caused by excessively low moisture content.

[0040] When the wood board needs to be sprayed with a hardener, the hardener aqueous solution storage tank 2 contains an acidic hardener aqueous solution. While spraying the hardener onto the wood board, the water content of the wood board is increased. When the wood board does not need to be sprayed with an acidic hardener and only needs to increase its water content, the hardener aqueous solution storage tank 2 contains water, and water mist is sprayed onto the top and bottom of the wood board to increase its water content. Example 2

[0041] A plywood processing system, such as Figure 2 As shown, based on the gluing system of Example 1, subsequent processing equipment is added, specifically including: a board laying machine 6, a cold press 7, a top-coating machine 8, a hot press 9, and an edge saw 10 arranged in sequence according to the process. After the wood boards 20 are coated with glue on both sides by the roller-type glue applicator 1, they enter the board laying machine 6. In the board laying machine 6, the glued wood boards are stacked together, and the adhesive between the boards bonds them together. The stacked wood boards enter the cold press 7, are compacted in the cold press 7, and then sent to the top-coating machine 8. The top-coating machine 8 applies decorative adhesive to the outer surface of the compacted plywood layer and then sends it to the hot press 9. After hot pressing, it enters the edge saw 10 for edge trimming and processing, and then is packaged.

[0042] The board laying machine 6, cold press 7, surface adhesive coating machine 8, hot press 9, and edge sawing machine 10 are all existing equipment for plywood processing, and the structure of these devices will not be described in detail in this embodiment. Example 3

[0043] As in Example 1, a hardener is sprayed onto the wood panel using an atomizing nozzle. During the spraying process, some of the hardener atomized by the nozzle escapes from the nozzle box 4 and diffuses into the air, polluting the work environment and affecting the health of workers. Since the implementation of Example 1, the inventors have been working to solve this problem. This embodiment effectively solves the problem of hardener being atomized and diffused into the work environment by designing the hardener spraying component as a hardener roller assembly. This embodiment mainly describes the structure of the hardener roller assembly.

[0044] The curing agent roller assembly of this invention is fixed by a bracket 33. The curing agent roller assembly includes an upper adhesive roller 22, an upper suction roller 27, an upper water tank 25, an upper suction control roller 24, a lower adhesive roller 23, a lower suction control roller 28, and a lower water tank 26. The lower adhesive roller 23 and the lower suction control roller 28 are positioned below the upper adhesive roller 22 and the upper suction roller 24. The upper water tank 25 is positioned below the upper suction roller 27, with the upper suction roller 27 partially submerged in the curing agent liquid in the upper water tank 25. The upper suction control roller 24 is above the liquid surface of the upper water tank 26. The lower water tank 26 is positioned below the lower adhesive roller 23 and the lower suction control roller 28, with the lower adhesive roller 23 partially submerged in the curing agent liquid in the lower water tank 26. The lower suction control roller 28 is above the liquid surface of the lower water tank 26.

[0045] The upper glue roller 22, upper liquid suction control roller 24, and lower liquid suction control roller 28 rotate clockwise; the lower glue roller 23 and upper liquid suction roller 27 rotate counterclockwise. Gears 35 are respectively provided at both ends of the roller shafts of the upper glue roller 22 and the lower glue roller 23. Driven by the motor 34 and the chain 36, the upper glue roller 22 and the lower glue roller 23 rotate in a convective manner. It should be noted that using the motor 34 and chain 36 to drive the rollers is a mature technology; this embodiment will not elaborate further on how the motor 34 and chain 35 drive the convective rotation of the upper glue roller 22 and the lower glue roller 23.

[0046] As an optional solution, this embodiment also includes a roller conveyor belt 3. The curing agent roller assembly of this embodiment is set in the downstream process of the roller conveyor belt 3. The wooden board conveyed from the roller conveyor belt 3 passes through the gap between the upper suction roller 27, the upper water tank 25 and the lower suction control roller 28. Under the convection rotation of the upper glue roller 22 and the lower glue roller 23, the curing agent is sprayed on it and conveyed to the next process.

[0047] During the rotation of the upper suction roller 27, the curing agent in the upper water tank 25 is carried up and applied to the surface of the glue roller 22. The upper suction control roller 24 is used to control the flow rate of the curing agent carried up by the upper suction roller 27. When the upper suction roller 27 rotates clockwise, the carried curing agent first contacts the upper suction control roller 24 and is partially intercepted. By setting the upper suction control roller 24, excessive liquid carrying by the upper suction roller 27 can be prevented. In actual use, it was found that if the upper suction control roller 24 is not set, the excessive liquid carried up by the upper suction roller 27 during rotation will result in excessive curing agent adhering to the glue roller 22, causing excessive curing agent spraying on the wood board. By setting the upper suction control roller 24, the curing agent carried up by the upper suction roller 27 during rotation can be partially intercepted, effectively solving the problem of excessive curing agent spraying on the surface of the wood board.

[0048] As the lower glue roller 23 rotates clockwise, it carries up the curing agent in the lower water tank 26. The carried curing agent first comes into contact with the lower liquid suction control roller 28 and is partially blocked by the lower liquid suction control roller 28 to prevent the amount of liquid carried up by the lower glue roller 23 from being too large.

[0049] A gap of less than 3 mm is maintained between the upper glue roller 22 and the upper liquid suction roller 27, the lower glue roller 23 and the lower liquid suction control roller 28, and the upper liquid suction roller 27 and the upper liquid suction control roller 24, so as to block and control the amount of liquid absorbed by the upper glue roller 22 and the lower glue roller 23.

[0050] The upper liquid absorption control roller 24, the upper liquid absorption roller 27, and the lower liquid absorption control roller 28 are each equipped with a spacing adjustment component with the same structure. The spacing adjustment component is used to adjust the spacing between the upper liquid absorption roller 27 and the upper glue roller 22, the lower liquid absorption control roller 28 and the lower glue roller 23, and the upper liquid absorption control roller 24 and the upper liquid absorption roller 27, so as to control the amount of liquid absorbed by the upper glue roller 22 and the lower glue roller 23, thereby controlling the amount of hardener sprayed on the wood board.

[0051] The aforementioned spacing adjustment assembly can be any device capable of moving the upper suction control roller 24, upper suction roller 27, and lower suction control roller 28 left and right. This embodiment provides one implementable structure, as follows:

[0052] The aforementioned spacing adjustment assembly includes a T-shaped outer spherical bearing mounting base 30, a clamping screw 31, and an adjusting screw 32. The bracket 33 has a vertical clamping screw hole and a horizontal adjusting screw hole. The clamping screw 33 and the adjusting screw 34 pass through the clamping screw hole and the adjusting screw hole respectively and abut against the outer edge of the outer spherical bearing mounting base 30, thereby adjusting and fixing the outer spherical bearing mounting base 30.

[0053] The spacing adjustment component fine-tunes the distances between the upper liquid suction control roller 24 and the upper liquid suction roller 27, the distances between the upper liquid suction roller 27 and the upper adhesive roller 22, and the distances between the lower liquid suction control roller 28 and the lower adhesive roller 23, thereby adjusting the amount of hardener sprayed. Taking the adjustment of the distance between the upper liquid suction control roller 24 and the upper liquid suction roller 27 as an example, the working process of the spacing adjustment component is explained: The two ends of the upper liquid suction control roller 24 are connected to the outer spherical bearing fixing seat 30. When adjusting the displacement of the upper liquid suction control roller 24, first loosen the clamping screw 31, and then turn the adjusting screw 32 left or right to move the outer spherical bearing fixing seat 30 to the left or right, thereby achieving fine-tuning of the distance between the upper liquid suction control roller 24 and the upper liquid suction roller 27.

[0054] The outlet pipe of the delivery pump 5 is connected to the upper water tank 25. The upper water tank 25 is provided with an overflow pipe 29 connected to the lower water tank 26. The delivery pump 5 delivers the curing agent aqueous solution in the curing agent storage tank 2 to the upper water tank 25. The curing agent in the upper water tank 25 overflows to the lower water tank 26 through the overflow pipe 29, so that the delivery pump 5 can deliver the curing agent to both the upper water tank 25 and the lower water tank 26 at the same time.

[0055] To prevent overflow of the drain tank 26, a liquid level sensor is installed inside the drain tank 26. The liquid level sensor is connected to the delivery pump 5 to control the liquid level in the drain tank 26 within a certain range. When the liquid level exceeds the upper limit, the delivery pump stops delivering the curing agent; when the liquid level falls below the lower limit of the drain tank 26, the delivery pump starts delivering the curing agent to the upper drain tank 25. Connecting the liquid level sensor to the delivery pump to control the liquid level is a prior art and mature technology, not an innovative technology of this application. Any technology that can achieve the control of the liquid level range in the drain tank 26 using a liquid level sensor connected to the delivery pump is within the protection scope of this utility model. This embodiment illustrates one possible implementation method: Based on the upper and lower limits of the liquid level to be controlled in the lower water tank 26, an upper liquid level sensor and a lower liquid level sensor are respectively installed. The upper and lower liquid level sensors are connected to the controller of the delivery pump. When the lower liquid level sensor has no signal, the delivery pump runs, delivering the curing agent solution to the upper water tank 25. When the lower liquid level sensor has a signal but the upper liquid level sensor has no signal, the delivery pump continues to run. When the upper liquid level sensor has a signal, the delivery pump stops.

[0056] The curing agent consumption of the upper and lower rollers 22 and 23 is approximately equal. By monitoring the liquid level of the lower tank 26 (when the curing agent level in the lower tank 26 is below the lower limit, curing agent is replenished to both the upper and lower tanks 25 and 26), simultaneous replenishment of curing agent to both tanks can be achieved. This invention can ensure that when the liquid level in the lower tank 26 is below the lower limit, the curing agent in the upper tank 25 still submerges the upper suction roller 27, by repeatedly monitoring and adjusting the lower limit liquid level of the lower tank 26 and setting the position of the lower liquid level sensor.

[0057] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A plywood gluing system, characterized in that, It includes a roller-type glue applicator (1) and a curing agent spraying assembly; the curing agent spraying assembly is set at the front end of the roller-type glue applicator; the curing agent spraying assembly includes a curing agent storage tank (2), a delivery pump (5) and a curing agent spraying device; the delivery pump (5) is connected between the curing agent storage tank (2) and the spraying device through a pipeline; the curing agent spraying device is an atomizing nozzle or a curing agent roller assembly.

2. The plywood gluing system according to claim 1, characterized in that, The plywood coating system also includes a roller conveyor belt (3), which is located at the front end of the roller coating machine (1); the curing agent spraying equipment is an atomizing nozzle; the atomizing nozzles are respectively located above and below the roller conveyor belt (3).

3. The plywood gluing system according to claim 2, characterized in that, The atomizing assembly also includes a nozzle box (4), and the atomizing nozzle is disposed inside the nozzle box (4); the side of the nozzle box (4) facing the roller conveyor belt (3) is an open surface, and the spray nozzle is positioned facing the roller conveyor belt (3).

4. The plywood gluing system according to claim 1, characterized in that, The curing agent spraying assembly is a curing agent roller assembly; the curing agent roller assembly includes an upper glue roller (22), a lower glue roller (23), an upper water tank (25), a lower water tank (26), an upper liquid suction roller (27), and a lower liquid suction control roller (28); the outlet pipe of the delivery pump (5) is connected to the upper water tank (25); the upper liquid suction roller (27) is partially submerged in the curing agent liquid surface of the upper water tank (25); the lower glue roller (23) is partially submerged in the curing agent liquid surface of the lower water tank (26); the upper glue roller (22) and the lower glue roller (23) rotate in opposite directions; the upper glue roller (22) and the upper liquid suction roller (27) are tangent or have a gap of 2-3 mm; the lower glue roller (23) and the lower liquid suction control roller (28) are tangent or have a gap of 2-3 mm.

5. The plywood gluing system according to claim 4, characterized in that, The upper water tank (25) is provided with an overflow pipe (29) that connects to the lower water tank (26); the lower water tank (26) is provided with a liquid level sensor.

6. The plywood gluing system according to claim 5, characterized in that, The liquid level sensor includes an upper liquid level sensor and a lower liquid level sensor; the upper liquid level sensor and the lower liquid level sensor are respectively connected to the controller of the transfer pump (5).

7. The plywood gluing system according to claim 4, characterized in that, The upper suction roller (27) is also equipped with an upper suction control roller (24) that is tangent to it or has a gap of 2-3 mm. The upper suction control roller (24) is higher than the liquid surface of the upper water tank (25).

8. The plywood gluing system according to claim 7, characterized in that, The upper liquid suction control roller (24), the upper liquid suction roller (27), and the lower liquid suction control roller (28) are respectively provided with a spacing adjustment assembly at both ends; the spacing adjustment assembly includes an outer spherical bearing fixing seat (30), a clamping screw (31), and an adjusting screw (32); the bracket (33) is provided with a clamping screw hole and an adjusting screw hole, and the adjusting screw hole is horizontally opened; the clamping screw (31) and the adjusting screw (32) pass through the clamping screw hole and the adjusting screw hole respectively and abut against the outer edge of the outer spherical bearing fixing seat (30).

9. The plywood gluing system according to claim 4, characterized in that, The upper glue roller (22), the upper liquid suction control roller (24), and the lower liquid suction control roller (28) rotate clockwise; the lower glue roller (23) and the upper liquid suction roller (27) rotate counterclockwise.

10. A plywood processing system, characterized in that, The system includes the plywood gluing system as described in any one of claims 1 to 9, and further includes a board laying machine (6), a cold press (7), a top-coating machine (8), a hot press (9), and an edge saw (10) arranged sequentially after the curing agent spraying assembly.

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