MDI glue spraying system for plywood

Abstract

The invention relates to the field of plywood production equipment, and discloses an MDI glue spraying system for plywood, which comprises at least one plate input mechanism, an atomizing glue spraying device and at least one plate output mechanism which are sequentially arranged along the direction of a production line, the distance between the output end of the plate input mechanism and the input end of the plate output mechanism is smaller than the length of plywood in the production line direction. The atomization glue spraying device comprises an outer shell, a high-speed centrifugal sprayer and a transition grid plate; a conveying channel is formed in the positions, corresponding to the plate input mechanism and the plate output mechanism, of the outer shell in the horizontal direction in a penetrating mode, an atomization cavity is formed in the outer shell, at least one high-speed centrifugal sprayer is arranged on the side wall of the atomization cavity, the high-speed centrifugal sprayers are located above the conveying channel, and the transition grid plate is arranged at the bottom of the conveying channel. The MDI glue spraying system has the advantages that the overall failure rate of the MDI glue spraying system can be greatly reduced, and the atomization glue applying effect on plates is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of plywood production equipment technology, specifically to an MDI adhesive spraying system for plywood. Background Technology

[0002] Plywood is a three- or multi-layered sheet material made by rotary cutting logs into veneers or slicing timber into thin sheets and then gluing them together with adhesives. It usually uses an odd number of veneer layers and glues the adjacent veneer layers with their fiber directions perpendicular to each other.

[0003] To ensure the strength of plywood after gluing, some plywood uses MDI adhesive. Current technology typically employs a two-fluid electronic spray gun for atomizing and spraying the MDI adhesive, as disclosed in Chinese invention patent application CN202211598625.3, which describes a plywood spraying and adhesive application device. However, MDI adhesive is an oil-based adhesive and reacts with moisture in the air, causing it to harden. Two-fluid electronic spray guns have poor atomization of oil-based adhesives, easily leading to uneven application. Furthermore, the two-fluid electronic spray gun requires compressed air for atomization, and compressed air contains moisture, which can react with the MDI adhesive and cause clogging during application. Therefore, the overall system failure rate is high, and the adhesive application effect is poor, resulting in a large amount of waste boards and affecting board quality. Frequent downtime for maintenance also reduces production efficiency and increases production costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an MDI adhesive spraying system for plywood. This system solves the problems of existing technologies that use dual-fluid electronic spray guns to atomize and spray MDI adhesive, resulting in a high overall system failure rate, poor adhesive application effect, a large amount of waste boards, affecting board quality, frequent downtime for maintenance, reduced production efficiency, and increased production costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An MDI adhesive spraying system for plywood includes at least one board input mechanism, an atomizing adhesive spraying device, and at least one board output mechanism arranged sequentially along the production line direction. The distance between the output end of the board input mechanism and the input end of the board output mechanism is less than the length of the plywood along the production line direction.

[0007] The atomizing adhesive spraying device includes an outer shell, a high-speed centrifugal sprayer, and a transition grid plate. A conveying channel is provided horizontally through the outer shell at the positions corresponding to the plate input mechanism and the plate output mechanism. An atomizing chamber is formed inside the outer shell. At least one high-speed centrifugal sprayer is provided on the side wall of the atomizing chamber. The high-speed centrifugal sprayer is located above the conveying channel, and the transition grid plate is located at the bottom of the conveying channel.

[0008] Furthermore, the atomizing chamber is equipped with several high-speed centrifugal sprayers on the side wall near the plate output mechanism or on the side wall near the plate input mechanism, and the output end of each high-speed centrifugal sprayer atomizes and sprays adhesive in a horizontal direction.

[0009] Furthermore, the rotational speed of the high-speed centrifugal sprayer is 6000–15000 rpm.

[0010] Furthermore, the atomizing chamber has a first vertical wall on both the left and right sides in the middle, and the high-speed centrifugal sprayer is disposed on the first vertical wall; the upper part of the atomizing chamber has a guide slope that gradually extends from the middle position to the upper end of the first vertical wall on the left and right sides.

[0011] Furthermore, the left and right side walls of the atomizing chamber are provided with a first water collection tank and a second water collection tank from bottom to top above the conveying channel; the first water collection tank is provided with an inclined baffle extending upward on the side away from the side wall of the atomizing chamber, and the second water collection tank is provided with a vertical baffle extending vertically upward on the side away from the side wall of the atomizing chamber.

[0012] Furthermore, the atomizing chamber has a second vertical wall formed on both the front and rear sides in the middle. An observation window is provided in the middle of the second vertical wall. A third water collection tank is provided at the upper end of the observation window on the second vertical wall. The projections of the end of the third water collection tank and the upper end of the first inclined baffle in the vertical direction overlap.

[0013] Furthermore, on the left and right sides of the outer shell, a second inclined baffle is provided at the upper end of the corresponding conveying channel. Several water passage holes are provided through the second inclined baffle. A third inclined baffle is provided between the upper end of the second inclined baffle and the outer wall of the outer shell. Several dust suction openings are provided on the third inclined baffle, and each dust suction opening is connected to a dust removal device.

[0014] Furthermore, the lower part of the atomizing chamber is formed with a recovery trough that gradually narrows from top to bottom and from both sides to the middle. The recovery trough gradually slopes from one end to the other along the front-back direction, and a spiral conveying mechanism is provided in the recovery trough along the front-back direction. A waste discharge port is provided at the lower end of the recovery trough, and a filter device is connected to the waste discharge port.

[0015] Furthermore, the sidewall of the atomizing chamber is provided with a first protective layer at the position corresponding to the high-speed centrifugal sprayer, and the outer side of the outer shell is provided with a second protective layer at the position corresponding to the high-speed centrifugal sprayer; the first protective layer is made of stainless steel, and the second protective layer is made of polyethylene.

[0016] Furthermore, both the plate input mechanism and the plate output mechanism are vacuum belt conveyors.

[0017] By adopting the above-described technical solution of the present invention, at least the following beneficial effects are achieved:

[0018] 1. A high-speed centrifugal sprayer is used to atomize and spray the MDI adhesive. Since the high-speed centrifugal sprayer uses high speed to swirl the MDI adhesive, the MDI adhesive will be atomized under the action of centrifugal force. Therefore, unlike the dual-fluid electronic spray gun, it does not require the use of compressed air to assist in atomizing the MDI adhesive during the application process. This can effectively overcome the problem that the moisture in the compressed air in the dual-fluid electronic spray gun can easily react with the MDI adhesive and cause blockage.

[0019] 2. Because the high-speed centrifugal sprayer uses high rotation speed (6000-15000 rpm) to atomize the MDI adhesive, it can produce a better atomization effect for MDI adhesive compared with the dual-fluid electronic spray gun. Furthermore, by using multiple high-speed centrifugal sprayers to atomize the adhesive together, the MDI atomized adhesive can be more evenly dispersed to various positions in the atomization chamber, thereby ensuring more uniform application of adhesive to the board.

[0020] 3. Each high-speed centrifugal sprayer is positioned on the side wall of the atomization chamber near either the board output mechanism or the board input mechanism. Each high-speed centrifugal sprayer atomizes and sprays adhesive horizontally, rather than spraying vertically from top to bottom. This structural design ensures more even adhesive distribution on the board. Furthermore, if the high-speed centrifugal sprayers were to spray from top to bottom, they would need to be positioned higher, increasing the overall size of the atomization and adhesive spraying device. This structural design helps to reduce the overall size of the atomization and adhesive spraying device.

[0021] 4. Overall, it can greatly reduce the overall failure rate of the MDI glue spraying system and ensure the atomized glue application effect on the boards. This not only reduces the generation of waste boards during the production process and improves the quality of the plywood produced, but also reduces the frequency of downtime maintenance, thereby helping to improve production efficiency and reduce production costs.

[0022] 5. By forming first vertical walls on the left and right sides of the middle of the atomizing chamber, and gradually extending guide slopes from the middle to the left and right sides at the top of the atomizing chamber, the MDI glue sprayed by each high-speed centrifugal sprayer during the atomization process can flow down the guide slopes to the first vertical walls and then fall down from the first vertical walls. Therefore, through the above structural design, the atomized MDI glue can be prevented from accumulating into water droplets on the top wall of the atomizing chamber and falling down onto the board, which would cause uneven glue application and thus help improve the glue application effect on the board.

[0023] 6. By sequentially installing a first water collection trough and a second water collection trough from bottom to top on the side walls of the left and right sides of the atomization chamber, and providing observation windows on the front and rear sides of the middle of the atomization chamber, with a third water collection trough above the observation windows, it is possible to not only conveniently observe the internal situation through the observation windows during actual use, but also to collect and recycle the MDI glue that falls from the first vertical walls on the left and right sides and the third water collection troughs on the front and rear sides. This prevents the MDI glue from falling onto the board in the form of water droplets, thereby ensuring uniform glue application and avoiding waste.

[0024] 7. A second inclined baffle with water passage holes is installed above the input and output ends of the conveying channel, and a third inclined baffle with a dust suction opening is installed between the upper end of the second inclined baffle and the outer wall of the housing. Each dust suction opening is connected to a dust removal device. This allows the dust removal device to promptly remove the atomized MDI adhesive from the input and output ends of the conveying channel during operation, preventing the atomized MDI adhesive from drifting to the outside and thus avoiding injury to workers. Attached Figure Description

[0025] Figure 1 This invention relates to the overall structure of an MDI adhesive spraying system for plywood.

[0026] Figure 2 This is an overall structural diagram of the atomizing adhesive spraying device of the present invention;

[0027] Figure 3 This is a cross-sectional view of the atomizing adhesive spraying device of the present invention along the width direction;

[0028] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0029] Figure 5 This is a cross-sectional view of the atomizing adhesive spraying device of the present invention along its length.

[0030] Figure 6 for Figure 5 A magnified view of part B in the middle;

[0031] Figure 7 This is a structural diagram of the plate input mechanism or plate output mechanism in this invention.

[0032] Figure label:

[0033] MDI adhesive spraying system 100;

[0034] Plate feeding mechanism 1;

[0035] Atomizing adhesive spraying device 2, outer shell 21, conveying channel 211, atomizing chamber 212, first vertical wall 2121, guide slope 2122, second vertical wall 2123, high-speed centrifugal sprayer 22, transition grid plate 23, first water collection tank 24, first inclined baffle 241, second water collection tank 25, vertical baffle 251, observation window 26, third water collection tank 27, second inclined baffle 28, water passage hole 281, third inclined baffle 29, dust suction opening 291;

[0036] Sheet metal output mechanism 3;

[0037] 41 recycling tank, 411 waste discharge outlet, 42 screw conveyor mechanism, 43 filter device;

[0038] First protective layer 51, second protective layer 52;

[0039] Conveyor belt 6, suction hole 61. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see the appendix Figures 1 to 7As shown, this invention provides an MDI adhesive spraying system 100 for plywood. The MDI adhesive spraying system 100 includes at least one board input mechanism 1, an atomizing adhesive spraying device 2, and at least one board output mechanism 3 arranged sequentially along the production line direction. The distance between the output end of the board input mechanism 1 and the input end of the board output mechanism 3 is less than the length of the plywood along the production line direction, ensuring that the plywood can be transported from the board input mechanism 1 to the board output mechanism 3 via the atomizing adhesive spraying device 2 during production. In specific implementations, this invention can be configured with a [missing information - likely a design feature] on one side of the atomizing adhesive spraying device 2 according to actual production needs. One or more board input mechanisms 1 are set up, and one or more board output mechanisms 3 are set up on the other side of the atomizing adhesive spraying device 2. When multiple are set up, the two ends of each board input mechanism 1 are aligned, and the two ends of each board output mechanism 3 are aligned, and each board input mechanism 1 is provided with a corresponding board output mechanism 3 to form multiple production lines, meet the needs of mass production, improve production efficiency, and each production line can share a single atomizing adhesive spraying device 2, which can make better use of MDI adhesive and reduce the cost of the entire MDI adhesive spraying system 100.

[0042] The atomizing adhesive spraying device 2 includes a housing 21, a high-speed centrifugal sprayer 22, and a transition grid plate 23. A conveying channel 211 is horizontally provided on the housing 21 at positions corresponding to the board input mechanism 1 and the board output mechanism 3. This conveying channel 211 allows the board to pass through the interior of the housing 21, enabling the high-speed centrifugal sprayer 22 to atomize and spray MDI adhesive onto the upper surface of the board. An atomizing chamber 212 is formed inside the housing 21. At least one high-speed centrifugal sprayer 22 is provided on the side wall of the atomizing chamber 212, positioned above the conveying channel 211, allowing the atomized MDI adhesive sprayed by the high-speed centrifugal sprayer 22 to fall downwards onto the board passing through the conveying channel 211. The transition grid plate 23 is located at the bottom of the conveying channel 211. This transition grid plate 23 supports the board entering the conveying channel 211 and facilitates the falling of powder and unattached adhesive from the board.

[0043] In some embodiments of the present invention, please refer to the following: Figure 5As shown, the atomizing chamber 212 contains several high-speed centrifugal sprayers 22 on either the side wall near the board output mechanism 3 or the side wall near the board input mechanism 1. The specific number of high-speed centrifugal sprayers 22 can be increased or decreased according to actual needs, and this invention does not limit this. The output ends of each high-speed centrifugal sprayer 22 atomize and spray adhesive in a horizontal direction to ensure that the atomized MDI adhesive is more evenly sprayed onto the upper surface of the board. In specific implementations, the high-speed centrifugal sprayers 22 can be evenly distributed along the front-to-back direction to ensure that the MDI atomized adhesive sprayed by each high-speed centrifugal sprayer 22 is evenly dispersed to various positions within the atomizing chamber 212, thereby ensuring more uniform adhesive application to the board. Furthermore, the high-speed centrifugal sprayer 22 is a very mature type of sprayer in the prior art, and its specific structure and working principle are well known to those skilled in the art. In specific implementations, this invention can directly use existing high-speed centrifugal sprayers.

[0044] In some embodiments of the present invention, the high-speed centrifugal sprayer 22 rotates at a speed of 6,000 to 15,000 rpm to ensure the atomization effect of the MDI adhesive.

[0045] By adopting the above-described technical solution of the present invention, at least the following beneficial effects are achieved:

[0046] 1. A high-speed centrifugal sprayer 22 is used to atomize and spray the MDI adhesive. Since the high-speed centrifugal sprayer 22 uses high speed to swirl the MDI adhesive, the MDI adhesive will be atomized under the action of centrifugal force. Therefore, unlike the dual-fluid electronic spray gun, it does not require the use of compressed air to assist in atomizing the MDI adhesive during the application process. This can effectively overcome the problem that the moisture in the compressed air in the dual-fluid electronic spray gun can easily react with the MDI adhesive and cause blockage during the application process.

[0047] 2. Because the high-speed centrifugal sprayer 22 uses high speed (6000-15000 rpm) to atomize the MDI adhesive, compared with the dual-fluid electronic spray gun, the high-speed centrifugal sprayer 22 can produce a better atomization effect for the MDI adhesive. Furthermore, by using multiple high-speed centrifugal sprayers 22 to atomize and spray the adhesive together, the MDI atomized adhesive can be more evenly dispersed to various positions in the atomization chamber 212, thereby ensuring a more uniform application of adhesive to the board.

[0048] 3. Each high-speed centrifugal sprayer 22 is positioned on the side wall of the atomizing chamber 212 near the plate output mechanism 3 or near the plate input mechanism 1. Each high-speed centrifugal sprayer 22 atomizes and sprays adhesive horizontally, rather than spraying vertically from top to bottom. This structural design ensures more even adhesive distribution on the plate, as the atomized adhesive is evenly dispersed throughout the atomizing chamber 212 before landing on the plate, rather than spraying vertically directly onto the plate. Furthermore, if the high-speed centrifugal sprayers 22 were to spray from top to bottom, they would need to be positioned at a higher location, increasing the overall volume of the atomizing adhesive spraying device 2. This structural design helps to reduce the overall volume of the atomizing adhesive spraying device 2.

[0049] 4. Overall, it can greatly reduce the overall failure rate of the MDI glue spraying system 100 and ensure the atomized glue application effect on the boards. This not only reduces the generation of waste boards during the production process and improves the quality of the plywood produced, but also reduces the frequency of downtime maintenance, thereby helping to improve production efficiency and reduce production costs.

[0050] In some embodiments of the present invention, please refer to the following: Figure 3 As shown, the atomizing chamber 212 has a first vertical wall 2121 on both the left and right sides in the middle, and the high-speed centrifugal sprayer 22 is disposed on the first vertical wall 2121; the upper part of the atomizing chamber 212 has a guide slope 2122 that gradually extends from the middle position to the upper end of the first vertical wall 2121 on the left and right sides.

[0051] This invention forms first vertical walls 2121 on the left and right sides of the middle of the atomizing chamber 212, and simultaneously forms guide slopes 2122 on the upper part of the atomizing chamber 212, which gradually extend from the middle to the left and right sides. This allows the MDI adhesive sprayed by each high-speed centrifugal sprayer 22 during the atomization process to flow down along the guide slopes 2122 to the first vertical walls 2121, and then fall down from the first vertical walls 2121. Therefore, through the above structural design, the atomized MDI adhesive can be prevented from accumulating into water droplets on the top wall of the atomizing chamber 212 and falling down onto the board, resulting in uneven adhesive application, thereby helping to improve the adhesive application effect on the board.

[0052] In some embodiments of the present invention, please refer to the following: Figures 3 to 6As shown, the side walls on both sides of the atomizing chamber 212 are provided with a first water collection tank 24 and a second water collection tank 25 from bottom to top above the conveying channel 211. Both the first water collection tank 24 and the second water collection tank 25 are used to collect MDI glue falling down from the left and right sides of the atomizing chamber 212. The first water collection tank 24 has a first inclined baffle 241 extending upward on the side away from the side wall of the atomizing chamber 212. The first inclined baffle 241 mainly serves two functions: first, to guide the MDI glue falling from above into the first water collection tank 24; second, to prevent the atomized glue from flowing back upward and to guide the MDI glue accumulated on the lower surface of the first inclined baffle 241 into the first water collection tank 24. The second water collection tank 25 has a vertical baffle 251 extending vertically upward on the side away from the side wall of the atomizing chamber 212 to ensure that the MDI glue does not flow out from the side of the second water collection tank 25 away from the atomizing chamber 212.

[0053] Furthermore, the atomizing chamber 212 has a second vertical wall 2123 formed on both the front and rear sides in the middle. An observation window 26 is provided in the middle of the second vertical wall 2123. A third water collection tank 27 is provided at the upper end of the observation window 26 on the second vertical wall 2123. The projection of the end of the third water collection tank 27 and the upper end of the first inclined baffle 241 in the vertical direction overlaps to ensure that the MDI glue flowing out from both ends of the third water collection tank 27 can fall down to the first inclined baffle 241 and enter the first water collection tank 24 under the guidance of the first inclined baffle 241. In a specific implementation of this invention, the first water collection tank 24 is mainly used to collect MDI glue that flows out and falls from both ends of the third water collection tank 27; the second water collection tank 25 is mainly used to collect MDI glue that slides down from the first vertical wall 2121; the third water collection tank 27 is mainly used to collect MDI glue above the observation window 26, so that the MDI glue will not form a water curtain at the observation window 26, thus making it easier to observe the internal situation through the observation window 26; at the same time, the first water collection tank 24 and the second water collection tank 25 can be directly connected to an external recycling bin (not shown) to realize the recycling of MDI glue.

[0054] This invention provides a first water collection trough 24 and a second water collection trough 25 arranged sequentially from bottom to top on the side walls of the atomizing chamber 212 on both the left and right sides. Simultaneously, observation windows 26 are provided on the front and rear sides of the middle of the atomizing chamber 212, and a third water collection trough 27 is provided above the observation windows 26. This allows for convenient viewing of the interior through the observation windows 26 during use, and also enables the collection and recycling of MDI adhesive that falls from the first vertical wall 2121 on the left and right sides and the third water collection troughs 27 on the front and rear sides. This prevents MDI adhesive from falling onto the board as water droplets, ensuring uniform adhesive application and avoiding waste.

[0055] In some embodiments of the present invention, please refer to the following: Figure 4 As shown, the left and right sides of the outer casing 21 are provided with second inclined baffles 28 extending upward at the upper end of the corresponding conveying channel 211. Several water passage holes 281 are provided through the second inclined baffles 28 for the atomized MDI glue to pass through. A third inclined baffle 29 is provided between the upper end of the second inclined baffles 28 and the outer wall of the outer casing 21. Several dust suction openings 291 are provided on the third inclined baffles 29, and each dust suction opening 291 is connected to a dust removal device (not shown). During operation, the dust removal device can be used to provide suction to draw the atomized MDI glue located at the input and output ends of the conveying channel 211 into the dust removal device for dust removal, so as to prevent the atomized MDI glue from drifting out from the input and output ends of the conveying channel 211 to the outside.

[0056] Because MDI adhesive has a certain degree of toxicity, it can easily harm the health of workers. Therefore, this invention employs a second inclined baffle 28 with a water passage hole 281 above the input and output ends of the conveying channel 211, and a third inclined baffle 29 with a dust suction opening 291 is provided between the upper end of the second inclined baffle 28 and the outer wall of the outer casing 21. Each dust suction opening 291 is connected to a dust removal device. This allows the dust removal device to promptly remove the atomized MDI adhesive from the input and output ends of the conveying channel 211 during operation, preventing the atomized MDI adhesive from drifting to the outside and thus avoiding harm to workers.

[0057] In some embodiments of the present invention, please refer to the following: Figure 3 and Figure 5 As shown, the lower part of the atomizing chamber 212 has a recovery trough 41 that gradually narrows from top to bottom and from both sides to the middle. The recovery trough 41 is used to collect powder and other impurities and MDI glue falling from above. The recovery trough 41 gradually slopes from one end to the other along the front-back direction, and a spiral conveying mechanism 42 is arranged inside the recovery trough 41 along the front-back direction. In this way, under the conveying of the spiral conveying mechanism 42, the powder and other impurities and MDI glue in the recovery trough 41 will gather at the lower end. A waste discharge outlet 411 is provided at the lower end of the recovery trough 41, and a filter device 43 is connected to the waste discharge outlet 411. In a specific implementation of the present invention, the filter device 43 can also be connected to the external recycling bin. When the powder and other impurities and MDI glue are conveyed by the screw conveyor 42 to the lower end of the recycling tank 41, the powder and other impurities and MDI glue will be discharged from the waste discharge port 411 to the filter device 43. After being filtered by the filter device 43, the filtered MDI glue can be sent to the external recycling bin for recycling.

[0058] In some embodiments of the present invention, please refer to the following: Figure 3 As shown, a first protective layer 51 is provided on the side wall of the atomizing chamber 212 at the position corresponding to the high-speed centrifugal atomizer 22. This first protective layer 51 mainly serves to isolate MDI adhesive. A second protective layer 52 is provided on the outer side of the outer shell 21 at the position corresponding to the high-speed centrifugal atomizer 22. This second protective layer 52 also serves to isolate MDI adhesive and facilitates disassembly and maintenance. The first protective layer 51 is made of stainless steel; the second protective layer 52 is made of polyethylene, specifically high-molecular-weight polyethylene. By providing a first protective layer 51 and a second protective layer 52 on the side wall of the atomizing chamber 212 and the outer side of the outer shell 21 at the positions corresponding to the high-speed centrifugal atomizer 22, this invention can prevent atomized MDI adhesive in the atomizing chamber 212 from drifting out from the gap between the high-speed centrifugal atomizer 22 and the outer shell 21.

[0059] In some embodiments of the present invention, please refer to the following: Figure 7 As shown, both the board input mechanism 1 and the board output mechanism 3 are vacuum belt conveyors. In a specific implementation of this invention, an adsorption hole 61 is provided on the conveyor belt 6 of the vacuum belt conveyor, and the vacuum belt conveyor is connected to a negative pressure suction device (not shown). During operation, the negative pressure suction device provides suction to adsorb the conveyed board onto the conveyor belt 6, ensuring that the board input mechanism 1 can reliably convey the board to the board output mechanism 3. It should be noted that the vacuum belt conveyor is a very mature type of conveyor in the prior art, and its specific structure and working principle are well known to those skilled in the art. Therefore, a detailed description of the vacuum belt conveyor is not provided here.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An MDI adhesive spraying system for plywood, characterized in that, It includes at least one board input mechanism, an atomizing glue spraying device, and at least one board output mechanism arranged sequentially along the production line direction, wherein the distance between the output end of the board input mechanism and the input end of the board output mechanism is less than the length of the plywood along the production line direction. The atomizing adhesive spraying device includes an outer shell, a high-speed centrifugal sprayer, and a transition grid plate. A conveying channel is provided horizontally through the outer shell at the positions corresponding to the plate input mechanism and the plate output mechanism. An atomizing chamber is formed inside the outer shell. At least one high-speed centrifugal sprayer is provided on the side wall of the atomizing chamber. The high-speed centrifugal sprayer is located above the conveying channel, and the transition grid plate is located at the bottom of the conveying channel.

2. The MDI adhesive spraying system for plywood according to claim 1, characterized in that, The atomizing chamber is equipped with several high-speed centrifugal sprayers on the side wall near the plate output mechanism or on the side wall near the plate input mechanism, and the output end of each high-speed centrifugal sprayer is directed to atomize and spray adhesive in the horizontal direction.

3. The MDI adhesive spraying system for plywood according to claim 1, characterized in that, The high-speed centrifugal sprayer rotates at a speed of 6000–15000 rpm.

4. An MDI adhesive spraying system for plywood according to any one of claims 1-3, characterized in that, The atomizing chamber has a first vertical wall on both the left and right sides in the middle, and a high-speed centrifugal sprayer is installed on the first vertical wall. The upper part of the atomizing chamber has a guide slope that gradually extends from the middle position to the upper end of the first vertical wall on the left and right sides.

5. The MDI adhesive spraying system for plywood according to claim 4, characterized in that, The left and right side walls of the atomizing chamber are provided with a first water collection tank and a second water collection tank from bottom to top above the conveying channel; the first water collection tank is provided with an inclined baffle extending upward on the side away from the side wall of the atomizing chamber, and the second water collection tank is provided with a vertical baffle extending vertically upward on the side away from the side wall of the atomizing chamber.

6. The MDI adhesive spraying system for plywood according to claim 5, characterized in that, The atomizing chamber has a second vertical wall on both the front and rear sides. An observation window is provided in the middle of the second vertical wall. A third water collection tank is provided at the upper end of the observation window on the second vertical wall. The projections of the end of the third water collection tank and the upper end of the first inclined baffle in the vertical direction overlap.

7. An MDI adhesive spraying system for plywood according to any one of claims 1-3, characterized in that, The left and right sides of the outer shell are provided with second inclined baffles extending upward at the upper end of the corresponding conveying channel. Several water passage holes are provided through the second inclined baffles. A third inclined baffle is provided between the upper end of the second inclined baffle and the outer wall of the outer shell. Several dust suction openings are provided on the third inclined baffle, and each dust suction opening is connected to a dust removal device.

8. The MDI adhesive spraying system for plywood according to claim 1, characterized in that, The lower part of the atomizing chamber has a recovery trough that gradually narrows from top to bottom and from both sides to the middle. The recovery trough gradually slopes from one end to the other along the front-back direction, and a spiral conveying mechanism is provided in the recovery trough along the front-back direction. A waste discharge port is provided at the lower end of the recovery trough, and a filter device is connected to the waste discharge port.

9. The MDI adhesive spraying system for plywood according to claim 1, characterized in that, The sidewall of the atomizing chamber is provided with a first protective layer at the position corresponding to the high-speed centrifugal sprayer, and the outer side of the outer shell is provided with a second protective layer at the position corresponding to the high-speed centrifugal sprayer; the first protective layer is made of stainless steel, and the second protective layer is made of polyethylene.

10. The MDI adhesive spraying system for plywood according to claim 1, characterized in that, Both the plate input mechanism and the plate output mechanism are vacuum belt conveyors.

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