A gluing device for plywood

Abstract

The application discloses a gluing equipment for plywood and belongs to the field of spraying devices. The gluing equipment comprises a first conveying area, a gluing area and a second conveying area arranged in sequence along the conveying direction of a production line. The first conveying area is provided with a first conveying device, the second conveying area is provided with a second conveying device, and the gluing area is provided with a transition grid plate and a spraying device located on the upper side of the transition grid plate. The first conveying device is used for conveying wood plates to be glued onto the transition grid plate, the spraying device is used for spraying and gluing the wood plates moving to the gluing area, and the second conveying device is used for conveying the glued wood plates to the next station. The gluing equipment further comprises a blowing device located in the area adjacent to the gluing area and the second conveying area, and the air outlet of the blowing device faces downward. The gluing equipment can avoid the problem that the atomized adhesive is taken to the outside of the gluing area by the moving wood plates.

Description

Technical Field

[0001] This invention relates to the field of plywood processing technology, and in particular to an adhesive application device for plywood processing. Background Technology

[0002] Plywood is a three- or multi-layered board made by gluing together with adhesives. In the plywood processing, multiple single pieces need to be bonded together with adhesives, which are usually applied by coating or spraying.

[0003] Pressure spraying is increasingly widely used because it ensures better adhesive uniformity. Typically, pressure spraying equipment uses a first conveyor to move the wood panels to be sprayed along the production line's direction, placing them under the spraying device for atomized spraying. A second conveyor then transports the sprayed panels to the next station. Because pressure spraying atomizes the adhesive before applying it to the wood panels, a cover is usually installed in the area of ​​the spraying device to prevent the atomized adhesive droplets from overflowing. However, since the wood panels need to be moved from the first to the second conveyor, some atomized adhesive droplets are inevitably carried out during this movement. Over time, this accumulation contaminates the conveyor belt of the second conveyor, reducing its reliability. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that during the operation of existing plywood gluing equipment, the moving wooden board carries the atomized adhesive to the outside of the spraying area.

[0005] To address the aforementioned technical problems, the present invention provides the following technical solution:

[0006] A plywood gluing device includes: a first conveying zone, a gluing zone, and a second conveying zone arranged sequentially along the conveying direction of the production line. The first conveying zone is equipped with a first conveying device, and the second conveying zone is equipped with a second conveying device. The gluing zone is equipped with a transition grid and a spraying device located above the transition grid. The first conveying device is used to convey the plywood to be glued onto the transition grid. The spraying device is used to spray glue onto the plywood that has moved to the gluing zone. The second conveying device is used to convey the glued plywood to the next station. The device also includes an air blowing device located in the area adjacent to the gluing zone and the second conveying zone, with the air outlet of the air blowing device facing downwards.

[0007] In some embodiments of the present invention, the air blowing device includes an air blowing pipe extending in a horizontal direction, the extension direction of the air blowing pipe being perpendicular to the conveying direction of the production line, and a plurality of air outlets being provided at intervals on the lower side of the air blowing pipe, with nozzles provided on the air outlets.

[0008] In some embodiments of the present invention, the spray surface formed by a plurality of the nozzles covers the extension direction of the air blowing pipe.

[0009] In some embodiments of the present invention, the spraying device includes: a spraying hood with an opening at the lower side, a plurality of spray holes on the upper side of the spraying hood, and a spray gun inserted into the spray holes; a spraying rod located on the upper side of the spraying hood, the spraying rod having a plurality of interfaces communicating with the spray gun through pipelines; and a suction hood installed on the spraying hood for suctioning the atomized adhesive in the area between the spraying hood and the wood board to be glued.

[0010] In some embodiments of the present invention, the adhesive application area is further provided with an anti-overflow plate, one end of which is installed on the spraying hood or suction hood, and the other end extends toward the direction of the second conveying area.

[0011] In some embodiments of the present invention, the anti-overflow plate is inclined upward from the side near the spraying device to the end near the second conveying area.

[0012] In some embodiments of the present invention, the air outlet of the air blowing device and the free end of the anti-overflow plate are spaced apart in the horizontal direction, and the air outlet of the air blowing device is located on the upper side of the anti-overflow plate.

[0013] In some embodiments of the present invention, the spraying hood includes a first hood plate near the first conveying area and a second hood plate near the second conveying area, the suction hood is mounted on the second hood plate, and the bottom end face of the suction hood extends to the bottom end of the spraying hood.

[0014] In some embodiments of the present invention, the adhesive application area is further provided with a guide plate, one end of which is mounted on the first cover plate of the spray coating body, and the other end extends toward the first conveying area.

[0015] In some embodiments of the present invention, the guide plate is inclined upward from the side near the spraying device to the end near the first conveying area.

[0016] The technical solution of the present invention has the following technical effects compared with the prior art:

[0017] In the plywood gluing equipment provided by the present invention, an air blowing device is provided in the area adjacent to the gluing area and the second conveying area, with its air outlet facing downward. When the wood board moves onto the second conveying device, the air blowing device blows high-pressure gas onto the wood board to prevent the atomized adhesive from overflowing along the surface of the wood board to the side of the second conveying device, thus avoiding the problem of the atomized adhesive falling onto the second conveying device and causing the conveyor belt to stick to the support frame. Attached Figure Description

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0019] Figure 1 This is a schematic diagram of a specific embodiment of the plywood gluing equipment of the present invention;

[0020] Figure 2 This is a schematic diagram of the spraying device in the plywood gluing equipment of the present invention;

[0021] Figure 3 This is a front view of a specific embodiment of the plywood gluing equipment of the present invention;

[0022] Figure 4 This is a schematic diagram of the spraying device and the air blowing device in the plywood gluing equipment of the present invention;

[0023] Figure 5 This is a schematic diagram of the spraying device and recycling device in the plywood gluing equipment of the present invention;

[0024] Figure 6 This is a schematic diagram of the recycling section in the plywood gluing equipment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the recycling section in the plywood gluing equipment of the present invention. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0027] In the description of this invention, 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. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1 The image shows a specific embodiment of the plywood gluing equipment (hereinafter referred to as the gluing equipment) of the present invention. The gluing equipment is used to provide MDI adhesive to a wood board A (which is used to make plywood, etc. after being glued). Of course, other atomizable adhesives can also be sprayed.

[0031] Reference Figure 1 , Figure 2 As shown, the gluing equipment includes a first conveying zone 10A, a gluing zone 20, and a second conveying zone 10B arranged sequentially along the conveying direction of the production line. The first conveying zone 10A is equipped with a first conveying device, and the second conveying zone 10B is equipped with a second conveying device. The gluing zone 20 is equipped with a transition grid plate 21 and a spraying device 22 located on the upper side of the transition grid plate 21. The first conveying device conveys the wood board A to be glued to the transition grid plate 21. The spraying device 22 is used to spray glue onto the wood board A on the transition grid plate 21. The second conveying device is used to convey the glued wood board A to the next station.

[0032] The first conveying device and the second conveying device each include a conveyor belt 13 for supporting the wooden board A. The conveyor belt 13 has several through holes 13a, and the conveyor belt 13 is connected to a negative pressure suction device (not shown in the figure) through the through holes 13a. In this way, the wooden board A passing over the conveyor belt 13 is tightly pressed against the conveyor belt 13 under the action of the negative pressure suction device, which increases the friction between the wooden board A and the conveyor belt 13, avoids the problem of the wooden board A stalling when passing over the unpowered transition grid 21, and makes the coating of the wooden board A more uniform.

[0033] Reference Figure 2The image shows a spraying device 22 of a specific embodiment of the adhesive application equipment of the present invention. The spraying device 22 includes a spraying cover 221 with an opening on the lower side. The spraying cover 221 spans across the transition grid plate 21, that is, the length direction of the spraying cover 221 is perpendicular to the conveying direction of the wooden board A. The upper side of the spraying cover 221 is provided with a plurality of spray holes 221a spaced apart along its length direction. A spray gun 224 is inserted into the spray holes 221a. The nozzle of the spray gun 224 is facing the transition grid plate 21. When the wooden board A moves onto the transition grid plate 21 under the action of the first conveying device, the spray gun 224 is controlled to perform spraying treatment, so that the MDI adhesive is sprayed onto the surface of the wooden board A along the width direction, and is evenly sprayed onto the entire surface of the wooden board A as the wooden board A moves at a uniform speed.

[0034] To prevent the atomized adhesive from being carried to the outside of the adhesive application area 20 by the moving wooden board A, such as... Figure 1 As shown, the adhesive application equipment also includes an air blowing device 30. The air blowing device 30 is located in the area adjacent to the adhesive application area 20 and the second conveying area 10B. That is, the air blowing device 30 is located in the upper area of ​​the position adjacent to the second conveying device and the transition grid plate 21. Its air outlet faces downward. When the wooden board A moves onto the second conveying device, the air blowing device 30 is controlled to blow high-pressure gas onto the wooden board A to prevent the atomized adhesive from overflowing along the surface of the wooden board A to the side of the second conveying device.

[0035] Specifically, the air blowing device 30 includes an air blowing pipe 31 spanning the upper side of the wooden board A. The air blowing pipe 31 is connected to a high-pressure supply line, and the air blowing pipe 31 extends horizontally, and its extension direction (i.e., Figure 1 The first direction (indicated by arrow a) is perpendicular to the conveying direction of the production line. Several air outlets are spaced apart on the lower side of the air blowing pipe 31, and nozzles are provided on the air outlets.

[0036] More specifically, the air outlet is perpendicular to the surface of the wooden board A, and the spray surface of the nozzle is fan-shaped. Several nozzles form a spray surface that can cover the first direction a, which can prevent the atomized adhesive from being blown into other areas except the adhesive application area 20.

[0037] like Figure 2 As shown, a suction hood 223 is also installed on the spraying hood 221. The suction hood 223 is ultimately connected to a first suction device (not shown in the figure) and is used to suction the atomized adhesive in the area between the spraying hood 221 and the wooden board A to be glued. More specifically, the spraying hood 221 includes a first cover plate 221b near the first conveying device and a second cover plate 221c near the second conveying device. A plurality of suction hoods 223 are connected to the second cover plate 221c, and the bottom end faces of the plurality of suction hoods 223 cover the width of the transition grid plate 21 along the direction perpendicular to the running direction of the wooden board A.

[0038] The bottom end of the suction hood 223 extends to the bottom end of the spraying hood 221. The suction hood 223 is formed into an approximately trapezoidal hood structure that is wider at the bottom and narrower at the top. This hood structure facilitates smoother airflow and reduces the energy consumption of the first suction device. Figure 2 As shown, the bottom of the suction hood 223 is provided with an inclined guide grid plate, which is used to guide the large droplets of atomized adhesive in the suction hood 223 to the transition grid plate 21.

[0039] Specifically, such as Figure 3 , Figure 4 As shown, the spraying device 22 also includes an overflow plate 225. One end of the overflow plate 225 is connected to the lower side of the suction hood 223, and the other end extends toward the direction of the second conveying device. The overflow plate 225 is approximately parallel to the wooden board A that moves in this area. It can keep the atomized adhesive overflowing along the opening side of the spraying hood 221 in the area between the overflow plate 225 and the wooden board A. Along the extension direction of the overflow plate 225, the amount of atomized adhesive gradually decreases to reduce its overflow.

[0040] More specifically, the spill guard 225 is inclined upward from the side near the spraying device 22 (i.e., the suction hood 223 side) to the side near the second conveying device (i.e., the free end of the spill guard 225), which allows the liquefied adhesive in the lower area of ​​the spill guard 225 to flow out along the inclined plate surface to the spraying device 22 side and into the recycling device 50 of the adhesive application equipment.

[0041] Specifically, the air outlet of the air blowing device 30 is horizontally spaced from the free end of the anti-overflow plate 225, and the air outlet of the air blowing device 30 is located on the upper side of the anti-overflow plate 225, which can prevent the atomized gas at the free end of the anti-overflow plate 225 from overflowing upward.

[0042] like Figure 3 , Figure 4 As shown, the spraying device 22 also includes a guide plate 226 for guiding the wooden board A to the lower side of the spraying cover 221. One end of the guide plate 226 is connected to the first cover plate 221b of the spraying cover 221, and the other end extends toward the first conveying area 10A (the area where the first conveying device is located). This can prevent the front end of the wooden board A from warping too much and interfering with the first cover plate 221b of the spraying cover 221.

[0043] More specifically, the guide plate 226 is inclined upward from the side near the spraying device 22 to the end near the first conveying area 10A, that is, the distance between the free end of the guide plate 226 and the conveyor belt 13 of the first conveying device is large, which makes it easier for the wooden board A to enter the lower side of the guide plate 226; and the inclined guide plate 226 makes it easier to guide the wooden board A to the surface of the transition grid plate 21.

[0044] Specifically, refer to Figures 2-4 As shown, the spray gun 224 is an electronic spray gun 224, that is, the spray gun 224 is controlled by a solenoid valve. The spraying device 22 also includes a wiring conduit 229 located on the upper side of the spraying hood 221. A junction box 220 is provided at one end of the wiring conduit 229. The signal line of the electronic spray gun 224 is connected to the junction box 220 along the wiring conduit 229. The junction box 220 is connected to the main controller through a communication interface, which can conveniently transmit the signals of several electronic spray guns 224 to the main controller.

[0045] The adhesive application equipment also includes a recovery device 50 located below the transition grid plate 21, which is used to recover excess liquid adhesive during the spraying of the spraying device 22 and guide it into the recovery pipeline. The adhesive in the recovery pipeline is then transported back to the feeding device side through a filter device and a recovery pump.

[0046] like Figures 5-7 As shown, the recycling device 50 includes a recycling tank 51, with a discharge port 51a at one end of the recycling tank 51, and a recycling material holding box 52 located below the discharge port 51a. The recycling material holding box 52 has an outlet 52a connected to the recycling pipeline on its lower side. A drawer filter 53 is installed on the recycling material holding box 52, and the drawer filter 53 is removably installed on the recycling material holding box 52. After spraying by the spraying device 22, large droplets of atomized adhesive generated inside the spraying hood 221 and between the spraying hood 221 and the transition grid plate 21 condense and fall into the recycling tank 51 through the transition grid plate 21. These droplets then flow through the discharge port 51a into the recycling material holding box 52, are filtered by the drawer filter 53, and flow to the lower part of the recycling material holding box 52 before entering the recycling pipeline through the outlet 52a. After a period of production, the drawer filter 53 can be removed for cleaning. The above-mentioned recycling device 50 can realize the recycling of adhesives, reduce the pollution of production equipment by adhesives, and adopt a drawer-type filter structure to make the filter cleaning convenient and quick.

[0047] like Figure 6 , Figure 7 As shown, the recycling tank 51 is equipped with a spiral shaft 54, which rotates under the action of the first driving device 55 and conveys the adhesive to the discharge port 51a side.

[0048] Specifically, the recycling trough 51 is a V-shaped trough, and the bottom of the recycling trough 51 is inclined in the horizontal direction, and the discharge port 51a is located at the lowest end of the recycling trough 51.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A gluing apparatus for a plywood, characterized by comprising: The application relates to a glue applying device for a wood-based panel production line. The glue applying device comprises a first conveying area, a glue applying area and a second conveying area arranged in sequence along the conveying direction of the production line, wherein the first conveying area is provided with a first conveying device, the second conveying area is provided with a second conveying device, and the glue applying area is provided with a transition grid and a spraying device located on the upper side of the transition grid; the first conveying device is used for conveying wood-based panels to be glued to the transition grid, the spraying device is used for spraying glue on the wood-based panels moving to the glue applying area, and the second conveying device is used for conveying the glued wood-based panels to the next work station. The glue applying device further comprises a blowing device located in the area adjacent to the glue applying area and the second conveying area, wherein the air outlet of the blowing device faces downward; the blowing device comprises a blowing pipe extending in the horizontal direction, the extending direction of the blowing pipe is perpendicular to the conveying direction of the production line, a plurality of air outlets are arranged on the lower side of the blowing pipe in a spaced manner, and a plurality of nozzles are arranged on the air outlets; the spraying surface formed by the nozzles covers the extending direction of the blowing pipe. The glue applying area is further provided with an anti-overflow plate, wherein the anti-overflow plate is arranged in an upwardly inclined manner from the side close to the spraying device to the end close to the second conveying area; the air outlets of the blowing device and the free end of the anti-overflow plate are arranged in a spaced manner in the horizontal direction, and the air outlets of the blowing device are located on the upper side of the anti-overflow plate.

2. The gluing apparatus for plywood according to claim 1, wherein The spraying device comprises: a spraying cover with an open lower side, wherein a plurality of spraying holes are arranged on the upper side of the spraying cover, and a plurality of spraying guns are inserted into the spraying holes; a spraying rod located on the upper side of the spraying cover, wherein a plurality of interfaces for connecting the spraying guns through pipelines are arranged on the spraying rod; a suction cover mounted on the spraying cover and used for sucking atomized adhesive in the area between the spraying cover and the wood-based panels to be glued.

3. A gluing apparatus for plywood according to claim 2, wherein One end of the anti-overflow plate is mounted on the spraying cover or the suction cover, and the other end extends towards the second conveying area.

4. The gluing apparatus for plywood according to claim 2, wherein The spraying cover comprises a first cover plate close to the first conveying area and a second cover plate close to the second conveying area, the suction cover is mounted on the second cover plate, and the bottom end surface of the suction cover extends to the bottom end of the spraying cover.

5. A gluing apparatus for plywood according to claim 4, wherein The glue applying area is further provided with a guide plate, wherein one end of the guide plate is mounted on the first cover plate of the spraying cover, and the other end extends towards the first conveying area.

6. A gluing apparatus for plywood according to claim 5, wherein The guide plate is arranged in an upwardly inclined manner from the side close to the spraying device to the end close to the first conveying area.

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