Gluing system for continuous flat pressing production line of MDI formaldehyde-free plywood

Abstract

The utility model discloses and provides an MDI formaldehyde-free plywood continuous flat pressing production line sizing system, which comprises a glue spraying device and a feeding device, the glue spraying device comprises a conveying belt and a spray gun mechanism, the feeding device comprises a glue storage tank and a heating oil tank, the output end of the glue storage tank is connected with the spray gun mechanism through one end of a glue loop pipe, and the other end of the glue loop pipe is connected with the heating oil tank. The other end of the glue loop pipe is connected with the first input end of the glue storage tank, a glue applying pump is arranged on the glue loop pipe, a plurality of heating pipes cover the outer side of the glue loop pipe, the output end of the heating oil tank is connected with a heating oil conveying pipe, and the heating oil conveying pipe sequentially passes through the heating pipes and then is connected with the input end of the heating oil tank to form a loop. And a heating oil pump is arranged on the heating oil conveying pipe. The glue storage tank and the heating oil conveying pipe are arranged, a circulating loop is formed through a pipeline, the temperature of glue is maintained through heating oil while glue is supplied, and after paving pauses, the situation that atomization cannot be achieved due to the fact that the glue temperature drops is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of adhesive application systems, and in particular to an adhesive application system for a continuous flat-press production line of MDI formaldehyde-free plywood. Background Technology

[0002] Plywood is a commonly used material for furniture boards. Traditional plywood processing involves applying adhesive to each sheet using a roller or spray coating method, followed by multi-layer pressing to form the final board. This adhesive application method is only suitable for urea-based plywood production lines. MDI formaldehyde-free plywood cannot be produced due to limitations in the MDI formaldehyde-free adhesive spraying process, especially since continuous flat-press production lines lack an adhesive application system.

[0003] The current plywood gluing system is a single-channel, single-phase glue supply. This method cannot ensure timely glue application when paving is paused. After paving is paused, the glue in the pipe stops flowing, the glue temperature drops, and the low-temperature glue cannot be atomized, resulting in uneven glue application during the second paving operation. Utility Model Content

[0004] This disclosure provides an adhesive application system for a continuous flat-press production line of MDI formaldehyde-free plywood to solve one of the technical problems recognized by the inventors.

[0005] This disclosure provides an adhesive application system for a continuous flat-press production line of MDI formaldehyde-free plywood, including an adhesive spraying device and a feeding device. The adhesive spraying device includes a conveyor belt and a spray gun mechanism, with the spray gun mechanism positioned above the conveyor belt. The feeding device includes an adhesive storage tank and a heating oil tank. The output end of the adhesive storage tank is connected to the spray gun mechanism via one end of an adhesive return pipe, and the other end of the adhesive return pipe is connected to the first input end of the adhesive storage tank. An adhesive application pump is installed on the adhesive return pipe, and several heating tubes are provided on the outer side of the adhesive return pipe. The output end of the heating oil tank is connected to a heating oil delivery pipe, which passes through several heating tubes in sequence and then connects to the input end of the heating oil tank to form a loop. A heating oil pump is installed on the heating oil delivery pipe.

[0006] Preferably, the glue circuit pipe is provided with a glue application outlet filter located between the glue storage tank and the spray gun mechanism.

[0007] Preferably, the heating oil tank is equipped with a heat exchange coil, one end of which is connected to an oil tank heating pipe, and a hot oil tank heating pump is installed on the oil tank heating pipe.

[0008] Preferably, it also includes a stirring mechanism, which includes a stirring motor fixedly mounted on the top of the heating oil tank, and the output shaft of the stirring motor is drivenly connected to a stirring rod, which is disposed inside the heating oil tank.

[0009] Preferably, it also includes a cleaning agent storage tank, which is connected to the adhesive circuit pipe via a cleaning agent outlet pipe, and a cleaning agent pump is installed on the cleaning agent outlet pipe.

[0010] Preferably, a cleaning agent filter is provided on the cleaning agent outlet pipe.

[0011] Preferably, a collection trough is provided at the bottom of the conveyor belt at a position corresponding to the spray gun mechanism, and the bottom of the collection trough is connected to the second input end of the glue storage tank through a collection pipe.

[0012] Preferably, the collection pipe is equipped with a three-stage filter.

[0013] Preferably, the conveyor belt and spray gun mechanism are covered with a mist suction hood, the top of the mist suction hood is connected to a fan inlet pipe, one end of the fan inlet pipe is connected to a dust removal fan, the output end of the dust removal fan is connected to a fan outlet pipe, and the end of the fan outlet pipe is connected to a bag filter.

[0014] The main advantages of this invention are as follows: By setting up a glue storage tank and a heating oil delivery pipe, and forming a circulating loop through the pipeline, the glue temperature is maintained by heating the oil while supplying glue. Furthermore, after the paving is paused, the glue in the pipe continues to move, preventing the glue temperature from dropping and causing atomization failure, resulting in better glue spraying effect.

[0015] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the adhesive application system structure according to an embodiment of the present disclosure;

[0018] Figure 2 This is a process flow diagram of the adhesive application system according to an embodiment of the present disclosure;

[0019] Icons: 1-Glue storage tank; 2-Glue application pump; 3-Conveyor belt; 4-Heating oil delivery pipe; 5-Mist hood; 6-Dust collector fan; 7-Fan outlet pipe; 8-Bag filter; 9-Fan inlet pipe; 10-Detergent outlet pipe; 11-Detergent pump; 12-Detergent filter; 13-Glue return pipe; 14-Detergent storage tank; 16-Agitator motor; 161-Agitator rod; 17-Heating oil tank; 18-Heating pipe; 19-Heating oil pump; 20-Hot oil tank heating pump; 21-Oil tank heating pipe; 22-Heat exchange coil; 23-Glue application outlet filter; 24-Spray gun mechanism; 25-Three-stage filter; 26-Collection tank; 27-Collection pipe. Detailed Implementation

[0020] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments.

[0021] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0022] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure 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 disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0024] Example

[0025] like Figure 1-2As shown, this embodiment provides an MDI formaldehyde-free plywood continuous flat pressing production line gluing system, including a glue spraying device and a feeding device. The glue spraying device includes a conveyor belt 3 and a spray gun mechanism 24. The conveyor belt 3 is used to transport plywood, and the spray gun mechanism 24 is disposed above the conveyor belt 3 for spraying glue onto the plywood. The spray gun mechanism 24 consists of multiple spray guns and can cover the transverse area of ​​the conveyor belt 3 to perform glue spraying operations on the passing plywood. The feeding device is used to supply material to the spray gun mechanism 24. The feeding device includes a glue storage tank 1 and a heating oil tank 17. The output end of the glue storage tank 1 is connected to the spray gun mechanism 24 through one end of a glue return pipe 13. The other end of the glue circuit pipe 13 is connected to the first input end of the glue storage tank 1. A glue application pump 2 is installed on the glue circuit pipe 13. The glue application pump 2 provides power to circulate the glue in the glue circuit pipe 13. Even when the paving is paused, the glue in the glue circuit pipe 13 will not stop moving, which would cause the glue temperature to drop and prevent atomization. Several heating pipes 18 are provided on the outer side of the glue circuit pipe 13. The output end of the heating oil tank 17 is connected to a heating oil delivery pipe 4. The heating oil delivery pipe 4 passes through several heating pipes 18 in sequence and then connects to the input end of the heating oil tank 17 to form a loop. A heating oil pump 19 is installed on the heating oil delivery pipe 4. Power is provided by the heating oil pump 19, which makes the heating oil circulate in the heating oil delivery pipe 4. When the heating oil passes through the heating pipe 18, the glue circuit pipe 13 is embedded inside the heating pipe 18. The heating oil and the glue inside the glue circuit pipe 13 exchange heat to heat the glue and ensure that the glue is maintained within a certain temperature range, so as to avoid the glue temperature dropping and the glue failing to atomize.

[0026] It should be noted that the spray gun is a single-fluid, high-pressure, adjustable, electrically controlled spray gun, and each spray gun can have its own flow rate. The spray gun switching frequency can reach 50Hz, the temperature resistance is 250℃, the pressure resistance is 25Bar, and the spray gun working pressure can be adjusted from 2.0-15Bar to achieve ultra-atomized MDI adhesive. The system achieves precise spraying by detecting the presence or absence of plywood master sheets on the paving line. Furthermore, applying different MDI adhesives to different plywood layers meets the requirements of the hot-pressing process and conserves MDI adhesive, which is crucial.

[0027] Furthermore, an adhesive outlet filter 23 is installed on the adhesive return pipe 13 between the adhesive storage tank 1 and the spray gun mechanism 24. The adhesive outlet filter 23 filters the adhesive to prevent impurities from affecting the application effect.

[0028] Furthermore, a heat exchange coil 22 is installed inside the heating oil tank 17. One end of the heat exchange coil 22 is connected to an oil tank heating pipe 21, and a hot oil tank heating pump 20 is installed on the oil tank heating pipe 21. In order to maintain the temperature of the heating oil in the heating oil tank 17, a heat exchange coil 22 is installed inside the heating oil tank 17, and a heat source is input through the hot oil tank heating pump 20, so that the heating oil and the heat source in the heat exchange coil 22 exchange heat, thereby maintaining the temperature of the heating oil.

[0029] In one embodiment, a stirring mechanism is also included. The stirring mechanism includes a stirring motor 16 fixedly mounted on the top of the heating oil tank 17. The output shaft of the stirring motor 16 is driven to a stirring rod 161, which is disposed inside the heating oil tank 17. The stirring motor 16 drives the stirring rod 161 to rotate, thereby stirring the heating oil in the heating oil tank 17 and making its temperature distribution more uniform.

[0030] In one embodiment, a cleaning agent storage tank 14 is also included. The cleaning agent storage tank 14 is connected to the adhesive return pipe 13 via a cleaning agent outlet pipe 10, and a cleaning agent pump 11 is installed on the cleaning agent outlet pipe 10. In cases of prolonged or short-term shutdowns, it is necessary to clean the adhesive spray gun, adhesive distribution pipe, or system adhesive application pipe with a specific cleaning agent. Incomplete cleaning or any cleaning problems may cause MDI adhesive to solidify within various components, leading to irreversible damage. In this embodiment, the cleaning agent in the cleaning agent storage tank 14 is delivered to the cleaning agent outlet pipe 10 via the cleaning agent pump 11. After passing through the cleaning agent outlet pipe 10, the cleaning agent enters the adhesive return pipe 13 and runs along the adhesive return pipe 13, cleaning the adhesive return pipe 13, the spray gun mechanism 24, and the adhesive storage tank 1. Repeated cleaning ensures that any residual MDI is thoroughly removed.

[0031] Furthermore, a cleaning agent filter 12 is provided on the cleaning agent outlet pipe 10. The cleaning agent is filtered through the cleaning agent filter 12.

[0032] In one embodiment, a collection trough 26 is provided at the bottom of the conveyor belt 3 at a position corresponding to the spray gun mechanism 24. The bottom of the collection trough 26 is connected to the second input end of the glue storage tank 1 via a collection pipe 27. During the spraying process, it is almost impossible to spray all the MDI glue onto the plywood master board. Some MDI glue is not accepted by the plywood master board. This part of the MDI glue is recycled by the collection trough 26 at the bottom of the spray gun. The glue recycled through the collection trough 26 is returned to the glue storage tank 1 through the collection pipe 27 for recycling, saving energy and reducing costs.

[0033] Furthermore, a three-stage filter 25 is installed on the collection pipe 27. The three-stage filter 25 on the collection pipe 27 filters the recovered glue to prevent impurities from contaminating the glue and causing poor glue application results in subsequent applications.

[0034] In one embodiment, a mist-absorbing hood 5 is provided outside the conveyor belt 3 and the spray gun mechanism 24. A fan inlet pipe 9 is connected to the top of the mist-absorbing hood 5, and a dust collector fan 6 is connected to one end of the fan inlet pipe 9. A fan outlet pipe 7 is connected to the output end of the dust collector fan 6, and a bag filter dust collector 8 is connected to the end of the fan outlet pipe 7. Since MDI adhesive diffuses into the air and is absorbed by the human body, posing a certain degree of harm, the adhesive particles diffused externally after spraying need to be treated environmentally. First, the conveyor belt 3 and the spray gun mechanism 24 are enclosed by the mist-absorbing hood 5 to prevent the atomized adhesive from spreading externally. Then, the dust collector fan 6 draws the atomized adhesive from inside the mist-absorbing hood 5 into the bag filter dust collector 8 for environmental treatment, preventing environmental pollution and impacting the health of workers.

[0035] The working principle of this invention is as follows: Adhesive and heating oil are supplied through a storage tank 1 and a heating oil tank 17, respectively. The adhesive circulates within the adhesive return pipe 13, while the heating oil circulates within the heating oil delivery pipe 4. When the heating oil passes through the heating pipe 18, it exchanges heat with the adhesive return pipe 13 to heat the adhesive, but without contacting the adhesive, thus ensuring the adhesive temperature and quality. An accumulation trough 26 at the bottom of the conveyor belt 3 collects excess adhesive, which is then filtered and returned to the storage tank 1. After passing through the storage tank 1, it re-enters the adhesive return pipe 13, undergoes secondary filtration by the adhesive application outlet filter 23, and is then supplied to the spray gun mechanism 24, saving energy. Simultaneously, during the adhesive spraying process, a mist suction hood 5 encloses the conveyor belt 3 and the spray gun mechanism 24 to prevent atomized adhesive from spreading externally. Then, a dust removal fan 6 sucks the atomized adhesive from inside the mist suction hood 5 into a bag filter dust collector 8 for environmentally friendly treatment, preventing environmental pollution and harm to workers' health.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A glue application system for a continuous flat-press production line of MDI formaldehyde-free plywood, characterized in that, include: The adhesive spraying device includes a conveyor belt and a spray gun mechanism, with the spray gun mechanism positioned above the conveyor belt. The feeding device includes an adhesive storage tank and a heating oil tank. The output end of the adhesive storage tank is connected to the spray gun mechanism via one end of an adhesive return pipe, and the other end of the adhesive return pipe is connected to the first input end of the adhesive storage tank. An adhesive pump is installed on the adhesive return pipe, and several heating tubes are provided on the outer side of the adhesive return pipe. The output end of the heating oil tank is connected to a heating oil delivery pipe, which passes through several heating tubes in sequence and then connects to the input end of the heating oil tank to form a loop. A heating oil pump is installed on the heating oil delivery pipe.

2. The gluing system of a continuous flat-pressing production line of MDI formaldehyde-free plywood according to claim 1, characterized in that, The glue return pipe is located between the glue storage tank and the spray gun mechanism and is equipped with a glue application outlet filter.

3. The gluing system of a continuous flat-pressing production line of MDI formaldehyde-free plywood according to claim 1, characterized in that, The heating oil tank is equipped with a heat exchange coil inside, one end of which is connected to an oil tank heating pipe, and a hot oil tank heating pump is installed on the oil tank heating pipe.

4. The gluing system of the continuous flat pressing production line of MDI formaldehyde-free plywood according to claim 3, characterized in that, It also includes a stirring mechanism, which includes a stirring motor fixedly installed at the top of the heating oil tank. The output shaft of the stirring motor is drivenly connected to a stirring rod, which is located inside the heating oil tank.

5. The gluing system of the MDI formaldehyde-free plywood continuous flat pressing production line according to claim 1, characterized in that, It also includes a cleaning agent storage tank, which is connected to the glue circuit pipe via a cleaning agent outlet pipe, and a cleaning agent pump is installed on the cleaning agent outlet pipe.

6. The gluing system of a continuous flat-pressing production line of MDI formaldehyde-free plywood according to claim 5, characterized in that, A cleaning agent filter is installed on the cleaning agent outlet pipe.

7. The gluing system of a continuous flat-pressing production line of MDI formaldehyde-free plywood according to claim 1, characterized in that, A collection trough is provided at the bottom of the conveyor belt at a position corresponding to the spray gun mechanism, and the bottom of the collection trough is connected to the second input end of the glue storage tank through a collection pipe.

8. The gluing system for a continuous flat-press production line of MDI formaldehyde-free plywood according to claim 7, characterized in that, The collection pipeline is equipped with a three-stage filter.

9. The gluing system of a continuous flat-pressing production line of MDI formaldehyde-free plywood according to claim 1, characterized in that, The conveyor belt and spray gun mechanism are covered with a mist suction hood. The top of the mist suction hood is connected to a fan inlet pipe. One end of the fan inlet pipe is connected to a dust removal fan. The output end of the dust removal fan is connected to a fan outlet pipe. The end of the fan outlet pipe is connected to a bag filter.

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