Quantitative curing agent spraying system for MDI formaldehyde-free plywood continuous production line

Abstract

The utility model discloses and provides an MDI formaldehyde-free plywood continuous production line quantitative curing agent spraying system, which comprises a batching device and a spraying device, the spraying device comprises a conveying belt and a spraying mechanism, the spraying mechanism is arranged above the conveying belt, the batching device comprises a batching tank and a storage tank, and the batching tank is arranged above the spraying mechanism. The output end of the batching tank is connected with the first input end of the material storage tank through a batching pipeline, an agent pump is arranged on the batching pipeline, the output end and the second input end of the material storage tank are connected through a spraying agent circulating pipeline to form circulation, the spraying agent circulating pipeline is in through connection with the spraying mechanism, and the spraying mechanism is in through connection with the spraying mechanism. A high-pressure spray pump is arranged at one end, close to the storage tank, of the spray circulating pipeline. The material storage tank is connected with the spraying agent circulating pipeline, the curing agent circularly flows in the material storage tank and the spraying agent circulating pipeline, the temperature and the pressure cannot be reduced, the batching tank is arranged to supplement the curing agent to the material storage tank in time, and it is ensured that the system can be normally used.

Description

Technical Field

[0001] This disclosure relates to the field of curing agent formulation and spraying equipment technology, and in particular to a quantitative curing agent spraying system for a continuous 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 spraying process of MDI formaldehyde-free adhesive, especially on continuous flat-press production lines where the adhesive application system is difficult to implement.

[0003] Due to the influence of MDI formaldehyde-free adhesive and hot pressing process, the steel belt speed of the continuous flat pressing system is difficult to meet the actual production capacity requirements. After discussion, it was found that a specific amount of curing agent was sprayed during the adhesive spraying stage to accelerate the curing of MDI formaldehyde-free adhesive during hot pressing, thereby increasing production capacity.

[0004] In current curing agent spraying systems, the curing agent flows in one direction only. When the flow stops, the curing agent stops flowing, which causes the curing agent temperature to drop and affects the effect of subsequent spraying. Utility Model Content

[0005] This disclosure provides a quantitative curing agent spraying system for a continuous production line of MDI formaldehyde-free plywood to solve one of the technical problems recognized by the inventors.

[0006] This disclosure provides a quantitative curing agent spraying system for a continuous production line of MDI formaldehyde-free plywood, including a batching device and a spraying device. The spraying device includes a conveyor belt and a spraying mechanism, which is disposed above the conveyor belt. The batching device includes a batching tank and a storage tank. The output end of the batching tank is connected to the first input end of the storage tank through a batching pipeline. A pump is installed on the batching pipeline. The output end and the second input end of the storage tank are connected through a spraying circulation pipeline to form a circulation. The spraying circulation pipeline is connected to the spraying mechanism. A high-pressure spraying pump is installed at the end of the spraying circulation pipeline near the storage tank.

[0007] Preferably, the ingredient tank is provided with a first heating coil inside, and one end of the first heating coil is located on the outside of the ingredient tank and connected to a first heating oil pump.

[0008] Preferably, a first pneumatic stirrer is connected to the top of the mixing tank, and the output end of the first pneumatic stirrer is located inside the mixing tank.

[0009] Preferably, the storage tank is provided with a second heating coil inside, one end of which is located on the outside of the storage tank and connected to a second heating oil pump.

[0010] Preferably, a second pneumatic agitator is connected to the top of the storage tank, and the output end of the second pneumatic agitator is located inside the storage tank.

[0011] Preferably, the outer pipe of the spray circulation pipeline is provided with multiple spray heating components, and the multiple spray heating components are interconnected through heating oil pipelines. One end of the heating oil pipeline is connected to a pipeline heating oil pump, and the other end of the heating oil pipeline is connected to an oil return pipeline. The oil return pipeline is connected to a heating oil tank, and the output end of the heating oil tank is connected to the input end of the pipeline heating oil pump through a pipeline.

[0012] Preferably, a receiving trough is provided at the bottom of the conveyor belt below the spraying mechanism, and a recycling pipe is connected through the bottom of the receiving trough. One end of the recycling pipe is connected to the second input end of the storage tank.

[0013] Preferably, a first filter is provided on the recycling pipeline.

[0014] Preferably, a second filter is provided in the spray circulation pipe located between the storage tank and the spraying mechanism.

[0015] Preferably, both the storage tank and the mixing tank are equipped with a liquid level sensor at the bottom, and both the storage tank and the mixing tank are equipped with a temperature sensor inside.

[0016] The main advantages of this invention are as follows: the present invention connects the storage tank to the spray circulation pipeline, and the curing agent circulates in the storage tank and the spray circulation pipeline. The temperature and pressure will not drop, resulting in better spraying effect. In addition, the invention is equipped with a mixing tank to replenish the curing agent in the storage tank in a timely manner, ensuring that the system can be used normally.

[0017] 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

[0018] 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.

[0019] Figure 1 This is a three-dimensional structural diagram of the curing agent spraying system according to an embodiment of the present disclosure;

[0020] Figure 2 This is a pipeline layout diagram of the curing agent spraying system according to an embodiment of the present disclosure;

[0021] Icons: 101-Conveyor belt; 102-Spraying mechanism; 2-Agent pump; 3-Mixing tank; 301-First heating coil; 302-First heating oil pump; 303-First pneumatic agitator; 4-Storage tank; 401-Second heating coil; 402-Second heating oil pump; 403-Second pneumatic agitator; 5-High-pressure spray pump; 6-Spray circulation pipeline; 701-Spray heating component; 702-Heating oil pump; 703-Heating oil pipeline; 704-Oil return pipeline; 801-Collection tank; 802-Recovery pipeline; 803-First filter; 9-Second filter. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Example

[0027] like Figure 1-2 As shown, this embodiment provides a quantitative curing agent spraying system for a continuous production line of MDI formaldehyde-free plywood, including a batching device and a spraying device.

[0028] The spraying device includes a conveyor belt 101 for transporting the board material. The conveyor belt 101 can be a conventional belt conveyor belt 101. A spraying mechanism 102 is arranged above the conveyor belt 101. The spraying mechanism 102 consists of multiple spray guns arranged in parallel. It is positioned above the conveyor belt 101 to spray the board material with curing agent.

[0029] The mixing device includes a mixing tank 3 and a storage tank 4. The output end of the mixing tank 3 is connected to the first input end of the storage tank 4 through a mixing pipeline. A pump 2 is installed on the mixing pipeline. The curing agent is fed into the mixing tank 3 in a certain proportion for heating and stirring. After mixing, the prepared curing agent is transported to the storage tank 4 by the pump 2 for spraying. The output end and the second input end of the storage tank 4 are connected to form a circulation through a spray circulation pipeline 6. The spray circulation pipeline 6 is connected to the spraying mechanism 102. A high-pressure spray pump 5 is installed at the end of the spray circulation pipeline 6 near the storage tank 4. The high-pressure spray pump 5 draws the curing agent from the storage tank 4 into the spray circulation pipe 6. The curing agent then reaches the spraying mechanism 102 through the spray circulation pipe 6. The spraying operation can be carried out by opening the valve of the spray gun. The remaining curing agent will return to the storage tank 4 through the spray circulation pipe 6. The curing agent circulates between the spray circulation pipe 6 and the storage tank 4, thereby ensuring the fluidity of the curing agent and preventing it from solidifying.

[0030] 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 an individual 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 curing agent. The system achieves fixed-spray function by detecting the presence or absence of plywood master sheets on the paving line. Furthermore, through data sharing on the paving line, the system can spray different curing dosages for different plywood layers to meet the requirements of the hot-pressing process. This is very important, as general spraying systems can hardly meet these requirements.

[0031] Specifically, the mixing tank 3 is equipped with a first heating coil 301 inside. One end of the first heating coil 301 is located on the outer pipe side of the mixing tank 3 and connected to a first heating oil pump 302. A device for supplying heating oil is connected to the input end of the first heating oil pump 302. The first heating oil pump 302 delivers heating oil into the first heating coil 301. The curing agent exchanges heat with the first heating coil 301 inside the mixing tank 3, thereby heating the curing agent and maintaining it at 60-75 degrees Celsius.

[0032] Furthermore, a first pneumatic stirrer 303 is bolted to the top of the mixing tank 3, and the output end of the first pneumatic stirrer 303 is located inside the mixing tank 3. The first pneumatic stirrer 303 stirs the curing agent inside the mixing tank 3, so that the curing agent inside is heated evenly and the overall temperature of the curing agent is uniform.

[0033] Specifically, the storage tank 4 is equipped with a second heating coil 401 inside. One end of the second heating coil 401 is located on the outside of the storage tank 4 and connected to a second heating oil pump 402. The structure of the storage tank 4 is the same as that of the batching tank 3. The second heating oil pump 402 is connected to a device that supplies heating oil to the second heating coil 401. The curing agent exchanges heat with the heating oil in the storage tank 4 and the second heating coil 401, thereby heating the curing agent and maintaining it at 60-75 degrees Celsius.

[0034] Furthermore, a second pneumatic stirrer 403 is connected to the top of the storage tank 4, and the output end of the second pneumatic stirrer 403 is located inside the storage tank 4. The second pneumatic stirrer 403 stirs the curing agent inside the mixing tank 3, so that the curing agent inside is heated evenly and the overall temperature of the curing agent is uniform.

[0035] In one embodiment, the spray circulation pipe 6 is covered with a plurality of spray heating components 701. These components are interconnected via heating oil pipes 703. One end of each heating oil pipe 703 is connected to a pipeline heating oil pump 702, and the other end is connected to an oil return pipe 704. The oil return pipe 704 is connected to a heating oil tank (not shown in the figure), and the output end of the heating oil tank is connected to the input end of the pipeline heating oil pump 702 via a pipe. The heating oil in the heating oil tank is pumped by the pipeline heating oil pump 702 to each spray heating component 701. The heating oil in the spray heating components 701 contacts the spray circulation pipe 6, heating the curing agent within the pipe 6. The heating oil does not directly contact the components, thus avoiding affecting the quality of the curing agent and ensuring that the curing agent maintains its temperature during pipeline transport.

[0036] In one embodiment, a receiving trough is provided at the bottom of the conveyor belt 101 below the spraying mechanism 102. A recycling pipe 802 is connected through the bottom of the receiving trough, and one end of the recycling pipe 802 is connected to the second input end of the storage tank 4. During the curing agent spraying process, it is almost impossible to spray all the curing agent onto the plywood motherboard. Some curing agent is not accepted by the plywood motherboard. This part of the curing agent is collected by the collection trough 801 at the bottom of the spraying area and returned to the storage tank 4 through the recycling pipe 802.

[0037] Furthermore, a first filter 803 is installed on the recycling pipe 802. If impurities from falling plywood are not thoroughly treated before being recycled, it will cause the spray gun to become clogged. By installing the first filter 803, impurities are removed before the material is returned to the storage tank 4.

[0038] Furthermore, a second filter 9 is installed in the spray circulation pipe 6 located between the storage tank 4 and the spraying mechanism 102. The second filter 9 improves the filtration effect, ensures impurities are thoroughly removed, and prevents the spray gun from clogging.

[0039] Furthermore, both the storage tank 4 and the mixing tank 3 are equipped with liquid level sensors at their bottoms, and both are equipped with temperature sensors inside. The liquid level sensors at the bottom of the storage tank 4 and the mixing tank 3 are used to detect the amount of curing agent stored inside, allowing for timely replenishment if the liquid level is too low. The temperature sensors inside the storage tank 4 and the mixing tank 3 are used to detect the temperature of the curing agent, facilitating adjustment to maintain it within a specific temperature range.

[0040] The working principle of this utility model is as follows: The curing agent is fed into the mixing tank 3 according to a certain ratio for heating and stirring. After mixing, the prepared curing agent is transported to the storage tank 4 by the pump 2, ready for spraying. The curing agent in the storage tank 4 is drawn into the spray circulation pipeline 6 by the high-pressure spray pump 5. The curing agent reaches the spraying mechanism 102 through the spray circulation pipeline 6. The spraying operation can be carried out by opening the valve of the spray gun. The remaining curing agent will return to the storage tank 4 through the spray circulation pipeline 6. The curing agent circulates between the spray circulation pipeline 6 and the storage tank 4, thereby ensuring the fluidity of the curing agent and preventing static solidification. The heating oil in the heating oil tank is transported to each spray heating component 701 by the pipeline heating oil pump 702. The heating oil in the spray heating component 701 contacts the spray circulation pipeline 6, heating the curing agent in the spray circulation pipeline 6. The oil does not directly contact the components, thus avoiding affecting the quality of the curing agent and ensuring that the curing agent maintains its temperature during pipeline transportation. During the spraying process, excess curing agent flows into the collection tank 801 for collection, and then returns to the storage tank 4 through the recycling pipe 802.

[0041] 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 quantitative curing agent spraying system for an MDI formaldehyde-free plywood continuous production line, characterized in that, include: The equipment includes a batching device and a spraying device. The spraying device includes a conveyor belt and a spraying mechanism, with the spraying mechanism positioned above the conveyor belt. The batching device includes a batching tank and a storage tank. The output end of the batching tank is connected to the first input end of the storage tank via a batching pipe. A pump is installed on the batching pipe. The output end and the second input end of the storage tank are connected via a spray circulation pipe to form a circulation. The spray circulation pipe is connected to the spraying mechanism. A high-pressure spray pump is installed at one end of the spray circulation pipe near the storage tank.

2. The quantitative curing agent spraying system of the MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, The mixing tank is equipped with a first heating coil inside, and one end of the first heating coil is located on the outside of the mixing tank and connected to a first heating oil pump.

3. The quantitative curing agent spraying system of the MDI formaldehyde-free plywood continuous production line according to claim 2, characterized in that, The top of the mixing tank is connected to a first pneumatic stirrer, and the output end of the first pneumatic stirrer is located inside the mixing tank.

4. The quantitative curing agent spraying system of the MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, The storage tank is equipped with a second heating coil inside, and one end of the second heating coil is located on the outside of the storage tank and connected to a second heating oil pump.

5. The quantitative curing agent spraying system of the MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, The top of the storage tank is connected to a second pneumatic agitator, and the output end of the second pneumatic agitator is located inside the storage tank.

6. The quantitative curing agent spraying system of a MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, The outer pipe of the spray circulation pipeline is equipped with multiple spray heating components. The multiple spray heating components are interconnected through heating oil pipelines. One end of the heating oil pipeline is connected to a pipeline heating oil pump, and the other end of the heating oil pipeline is connected to an oil return pipeline. The oil return pipeline is connected to a heating oil tank. The output end of the heating oil tank is connected to the input end of the pipeline heating oil pump through a pipeline.

7. The quantitative curing agent spraying system of a MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, The bottom of the conveyor belt is provided with a receiving trough located below the spraying mechanism. A recycling pipe is connected through the bottom of the receiving trough, and one end of the recycling pipe is connected to the second input end of the storage tank.

8. The quantitative curing agent spraying system of a MDI formaldehyde-free plywood continuous production line according to claim 7, characterized in that, A first filter is installed on the recycling pipeline.

9. The quantitative curing agent spraying system of a MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, A second filter is installed in the spray circulation pipe located between the storage tank and the spraying mechanism.

10. The quantitative curing agent spraying system of a MDI formaldehyde-free plywood continuous production line according to claim 1, characterized in that, Both the storage tank and the mixing tank are equipped with liquid level sensors at the bottom, and both the storage tank and the mixing tank are equipped with temperature sensors inside.

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