A kind of edge banding process of chipboard oblique straight molding powder spraying

Abstract

The present application relates to the technical field of edge sealing, and particularly relates to a planing board oblique straight shaping and powder spraying edge sealing process, which is applied to an oblique straight integrated edge sealing machine integrating a gluing station, a glue supplementing station, a glue removing station, an edge sealing station and a secondary glue supplementing station. The glue layer thickness is detected after gluing and dynamic glue supplementing / glue removing is performed. The edge sealing is monitored to monitor the glue amount state of the edge. Glue supplementing is accurately performed to the monitoring threshold value by using a glue supplementing mechanical arm. The mechanical arm can adjust the glue nozzle angle according to the oblique straight surface angle. The glue supplementing amount is calculated by using infrared detection gap parameters. The glue output speed and the walking path are dynamically adjusted. The present application realizes accurate and cooperative control of the glue amount, improves the glue supplementing efficiency and the edge sealing quality, effectively solves the glue leakage defect, and is suitable for a customized furniture oblique straight edge processing scene.

Description

Technical Field

[0001] This invention relates to the field of edge banding technology, and in particular to an edge banding process for powder coating of particleboard with a slanted and straight shape. Background Technology

[0002] As custom furniture styles become increasingly diverse, particleboard processing technology is also constantly evolving. Previously, cabinet doors and drawer panels required separate handles. Current technology involves beveling or fully beveling the edges of the board to create concealed handles, saving costs and improving aesthetics. Most edge banding machines on the market today can only bandle straight edges, not beveled or fully beveled edges, failing to meet the demands of new processing techniques. This necessitates switching to different types of edge banding machines, impacting production efficiency and resulting in low automation. Furthermore, the lack of end-to-end coordinated control during bevel and straight edge banding leads to poor quality and low efficiency in beveled, straight, and irregular edge banding.

[0003] Patent document CN117850336A discloses a control system for an integrated bevel and straight edge banding machine, including a programmable controller, a human-machine interface control unit, and an integrated bevel and straight edge banding control unit. The human-machine interface control unit and the integrated bevel and straight edge banding control unit are respectively connected to the programmable controller. The integrated bevel and straight edge banding control unit includes a bevel and straight edge processing mode, a full straight edge processing mode, and a full bevel processing mode. The human-machine interface control unit is equipped with a one-key switching unit, which is used to switch the processing mode of the integrated bevel and straight edge banding control unit to one of the bevel and straight edge processing mode, the full straight edge processing mode, and the full bevel processing mode.

[0004] In particleboard powder coating processes, the application of traditional PVC edge banding tape faces significant limitations. The core reason is that the high-temperature environment required for powder coating curing causes PVC material to soften and deform, failing to meet the stability requirements of the edge banding structure. Therefore, technological breakthroughs have led to the adoption of paper edge banding tape as an alternative material. However, in practical applications of integrated oblique and straight edge banding machines, the oblique and straight structure of the equipment makes paper edge banding tape prone to adhesive leakage during the gluing process. This results in quality defects such as surface wrinkles, localized cracking, residual adhesive, and edge chipping. Summary of the Invention

[0005] To address this, the present invention provides a powder-coated edge-sealing process for particleboard with a slanted and straight profile, thereby solving the technical problems of existing slanted and straight integrated edge-sealing machines where the control process is too simple and cannot accurately coordinate the glue replenishment according to the actual situation of the slanted and straight cut surface during the edge-sealing process, resulting in defects such as easy wrinkling, cracking, residual glue, and chipping of the paper edge-sealing tape.

[0006] To achieve the above objectives, this invention provides a powder-coated edge banding process for beveled and straight particleboard. This process is applied to an integrated beveled and straight edge banding machine, which includes an adhesive applicator. The adhesive applicator has an adhesive applicator station, a first adhesive replenishment station, an adhesive removal station, and a second adhesive replenishment station sequentially distributed along the conveying direction. The pressing mechanism of the integrated beveled and straight edge banding machine is located between the adhesive removal station and the second adhesive replenishment station. The process includes: Load the paper edge sealing tape into the edge sealing tape storage tray; The particleboard is fed into the bevel and straight edge banding machine and pre-milled to obtain particleboard with bevel and straight surfaces; The beveled and straight surfaces are sealed using an adhesive applicator and a pressing mechanism, while the particleboard is trimmed and scraped using an integrated beveled and straight edge sealing machine. After the particleboard is scraped, it is sanded and then electrostatically powder-coated to produce a particleboard with a slanted and straight shape. The edge sealing process of the beveled surface using an adhesive applicator and a pressing mechanism includes: At the glue application station, glue is applied to the inclined straight surface of the particleboard and the thickness of the glue layer is measured. If the thickness is less than the preset value, the adhesive layer is applied to the preset thickness at the first adhesive application station; if the thickness exceeds the preset value, the adhesive layer is reduced to the preset thickness at the adhesive removal station. The pressing mechanism seals the paper edge banding onto the inclined straight surface, and the glue application device monitors the glue level between the paper edge banding and the edge of the inclined straight surface. The removal conditions are determined based on the glue level, including the glue level reaching a monitoring threshold. If yes, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine; if no, after applying glue between the paper edge banding tape and the bevel and straight edge at the second glue application station to the monitoring threshold, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine.

[0007] Furthermore, the integrated oblique and straight edge sealing machine also integrates a glue-applying robotic arm along the conveying direction. This robotic arm is used at the second glue-applying station to apply glue between the paper sealing tape and the oblique and straight edge until it exceeds the monitoring threshold. This includes: Monitor the amount of glue remaining on the paper sealing tape and the beveled edge; When the glue level is determined to be below the monitoring threshold, the glue replenishing robot arm replenishes the glue between the paper sealing tape and the beveled edge until it exceeds the monitoring threshold.

[0008] Furthermore, the monitoring of the adhesive residue status at the edge of the paper sealing tape and the beveled straight surface includes: The location, length, width, and depth of the gap between the paper sealing strip and the beveled edge are obtained using an infrared device. The glue level at the corresponding gap location is determined based on the gap length, gap width, and gap depth. The glue level includes whether the glue level has reached a monitoring threshold or not. When the gap length does not exceed a preset standard gap length, the gap width does not exceed a preset standard gap width, and the gap depth does not exceed a preset standard gap depth, the glue level at the corresponding gap location is determined to have reached the monitoring threshold. When the gap length is greater than a preset standard gap length, or the gap width is greater than a preset standard gap width, or the gap depth is greater than a preset standard depth, the glue level at the corresponding gap location is determined to have not reached the monitoring threshold.

[0009] Furthermore, the glue-applying robotic arm includes a base, a first robotic arm, a second robotic arm, and a glue gun. One end of the base is fixedly connected to the main body of the oblique and straight integrated edge banding machine. The other end of the base is rotatably connected to one end of the first robotic arm via a first joint. The other end of the first robotic arm is rotatably connected to one end of the second robotic arm via a second joint. The other end of the second robotic arm is rotatably connected to the glue gun via a third joint. The glue gun includes several nozzles for selecting the appropriate nozzle for glue application based on the glue application area and amount.

[0010] Furthermore, the inclined plane includes an inclined plane and a straight plane, wherein the angle between the inclined plane and the horizontal plane is in the range of 0-90°, and the angle between the straight plane and the horizontal plane is 90°.

[0011] Furthermore, the glue-applying robotic arm applies glue between the paper sealing tape and the beveled edge until it exceeds the monitoring threshold, including: The location of the gap between the paper sealing strip and the edge of the inclined straight surface is determined based on whether the gap is on the paper sealing strip and the edge of the inclined surface or on the edge of the straight surface. When the gap is on the paper sealing strip and the edge of the inclined surface, the working angle of the glue nozzle of the glue-applying robot arm is determined to be the angle between the inclined surface and the horizontal plane; when the gap is on the paper sealing strip and the edge of the straight surface, the working angle of the glue nozzle of the glue-applying robot arm is determined to be 90°. The walking path and speed of the glue-applying robotic arm are determined based on the location of the gap. The nozzle type is determined based on the average gap width per unit length along the gap length direction; The amount of glue applied per unit length is calculated based on the average gap width and gap depth per unit length, and the initial glue dispensing speed of the nozzle is determined based on the amount of glue applied per unit length.

[0012] Furthermore, the gap length, gap width, and gap depth are acquired in real time, and the remaining glue amount is calculated. The initial glue dispensing speed is then adjusted to the actual glue dispensing speed based on the remaining glue amount. When the remaining glue amount is within the preset standard glue amount threshold range, the actual glue dispensing speed is adjusted to the initial glue dispensing speed; When the remaining glue amount exceeds the preset standard glue amount threshold range, the actual glue dispensing speed is adjusted to be the product of the glue dispensing speed adjustment coefficient and the initial glue dispensing speed.

[0013] Furthermore, the dispensing speed adjustment coefficient includes a first adjustment coefficient and a second adjustment coefficient. When the remaining amount of glue exceeds the maximum standard amount of glue in the preset standard glue amount threshold, the first adjustment coefficient is the ratio of the remaining amount of glue to the maximum standard amount of glue. When the remaining amount of adhesive is less than the minimum standard amount of adhesive in the preset standard adhesive amount threshold, the second adjustment coefficient is the ratio of the remaining amount of adhesive to the minimum standard amount of adhesive.

[0014] Furthermore, determining the travel path of the glue-applying robotic arm based on the gap location includes: the glue-applying robotic arm travels along the paper sealing strip and the edge of the inclined straight surface according to the working angle; when it is determined that there is no gap on the edge of the inclined straight surface, the glue-applying robotic arm raises the glue nozzle a preset distance in the opposite direction of the working angle; when it is determined that there is a gap on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the direction of the working angle to apply glue to the gap.

[0015] Furthermore, determining the walking speed of the glue-applying robotic arm based on the gap position includes: when the glue-applying robotic arm raises the nozzle a preset distance in the opposite direction of the working angle, it is determined that the glue-applying robotic arm is in an idle running state, and the walking speed is adjusted according to the idle running distance; when there is a gap on the edge of the inclined straight surface, when the glue-applying robotic arm lowers the nozzle in the working angle direction to apply glue to the gap, the walking speed is adjusted according to the actual glue dispensing speed.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting a first glue replenishment station and a second glue replenishment station in the bevel and straight edge sealing machine, the glue coating quality is improved; by replenishing the glue layer to a preset thickness at the first glue replenishment station or reducing the glue layer to a preset thickness at the glue removal station, the accuracy of the glue coating thickness is improved; by judging whether the removal condition is met based on the glue inventory and replenishing the glue between the paper sealing tape and the bevel and straight edge to above the monitoring threshold at the second glue replenishment station if the removal condition is not met, the glue coating accuracy of the bevel and straight edge is improved.

[0017] In particular, by integrating a glue-applying robotic arm along the conveying direction into the integrated oblique and straight edge sealing machine, the glue between the paper sealing tape and the oblique and straight edge is applied at the second glue-applying station to a level above the monitoring threshold, thereby improving the glue-applying efficiency and accuracy of the second glue-applying station.

[0018] In particular, by using an infrared device to acquire the location, length, width, and depth of the gap between the paper sealing tape and the beveled edge, the real-time performance and accuracy of the gap data acquisition are improved. Furthermore, by determining the glue level in the gap using preset criteria, a reliable data foundation is provided for subsequent scientific and effective glue replenishment. In particular, by setting joint rotation connections between the base, first robotic arm, second robotic arm and glue gun of the glue-applying robotic arm, 360° omnidirectional rotation of the robotic arm is achieved, which improves the flexibility of the glue-applying robotic arm in applying glue.

[0019] In particular, by using a glue-applying robotic arm to apply glue between the paper sealing tape and the beveled edge to a level above the monitoring threshold, the accuracy of glue application on the beveled edge is improved. Furthermore, by determining the working angle of the glue-applying robotic arm's nozzle based on whether the gap is on the paper sealing tape and the beveled edge or on the straight edge, the accuracy of the glue-applying robotic arm's nozzle operation is improved, thus enhancing glue application quality and efficiency. Additionally, by determining the nozzle type based on the average gap width per unit length along the gap length, nozzle selection is achieved. Finally, by calculating the glue application amount per unit length based on the average gap width and gap depth, segmented glue application measurement is implemented, improving the accuracy of determining the glue application amount.

[0020] In particular, the system can obtain the gap length, gap width, and gap depth in real time, calculate the remaining glue amount, and adjust the initial glue dispensing speed based on the remaining glue amount to obtain the actual glue dispensing speed, thus achieving a scientific and effective determination of the actual glue dispensing speed.

[0021] In particular, by comparing the remaining glue amount with the preset standard glue amount threshold range, the adjustment coefficient of the glue dispensing speed is determined, thereby improving glue dispensing efficiency and accuracy.

[0022] In particular, by determining the travel path of the glue-applying robotic arm based on the location of the gap, when it is determined that there is no gap on the edge of the inclined straight surface, the glue-applying robotic arm is raised in the opposite direction of the working angle, and when it is determined that there is a gap on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the direction of the working angle to apply glue to the gap. This allows the glue-applying robotic arm to flexibly switch working angles for inclined and straight edge gaps, improving the flexibility and accuracy of glue application for edge sealing on inclined straight surfaces.

[0023] In particular, by determining the walking speed based on the operating status of the glue-applying robotic arm, the walking speed can be adjusted quickly when the robotic arm is in an idle running state, reducing idle running time and improving work efficiency; when the robotic arm is in glue-applying state, the walking speed can be adjusted according to the actual glue dispensing speed, improving the accuracy of glue-applying work.

[0024] In summary, the edge-sealing process for powder coating of particleboard with oblique and straight shapes provided by this invention overcomes the technical bottleneck of stable oblique and straight powder coating of particleboard substrates through systematic innovation in materials, equipment, and post-processing. First, this process uses paper edge-sealing tape with excellent flexibility and high-temperature resistance, combined with high-temperature resistant PUR adhesive, to adapt to the bending requirements of 45° oblique and straight shapes and withstand the high temperatures of subsequent powder coating. Second, this process uses an integrated oblique and straight edge-sealing machine as the core equipment, completing the edge sealing through precise coordination of multiple processes including pre-milling, adhesive application, tape pressing, and edge trimming, ensuring a smooth surface free of wrinkles, cracks, residual adhesive, and chips. Finally, this process sands the edge-sealed shaped board with 600# sandpaper to improve the surface roughness and activity of the paper edge-sealing tape, enhancing the adhesion between the powder coating film and the paper edge-sealing tape, and improving the uniformity of powder coating, so that the physical and chemical properties of the particleboard meet the standards of resistance to thermal cycling and surface cracking resistance level 5. Attached Figure Description

[0025] Figure 1 This is a flowchart of the edge-sealing process for powder coating of particleboard in an embodiment of the present invention; Figure 2 This is a flowchart illustrating the application of adhesive to the inclined straight surface of particleboard using an adhesive applicator in an embodiment of the present invention. Figure 3 This is a logic diagram for monitoring the glue level of the paper sealing tape and the beveled edge in an embodiment of the present invention. Figure 4 This is a flowchart illustrating how the glue-applying robotic arm applies glue between the paper sealing tape and the beveled edge to a level exceeding the monitoring threshold, as described in this embodiment of the invention. Figure 5 This is a logic diagram in an embodiment of the present invention, showing how the initial dispensing speed is adjusted to the actual dispensing speed based on the remaining amount of glue. Detailed Implementation

[0026] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0027] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0029] In existing technologies, the increasingly diverse styles of customized furniture present new challenges to particleboard processing. Traditional edge banding machines can only handle straight edges and cannot adapt to the processing needs of beveled straight edges or fully beveled edges, leading to frequent equipment changes and impacting production efficiency. While existing beveled / straight integrated edge banding machines can switch processing modes, their glue volume control precision during edge banding is insufficient. They cannot dynamically adjust glue replenishment operations based on the actual glue condition of the beveled / straight cut surface, easily causing wrinkles, cracks, or glue residue on the paper edge banding surface. For example, patent CN117850336A achieves processing type conversion through mode switching, but it does not solve the problem of coordinated control between glue layer thickness and the adhesion state of the paper edge banding, resulting in unstable edge banding quality.

[0030] To address the aforementioned issues, the inventors discovered that the lack of coordinated control between adhesive layer thickness deviation and paper sealing tape adhesion in existing technologies is a key factor leading to quality defects. Specifically, if the adhesive layer is too thin after application, gaps may form in the paper sealing tape due to insufficient adhesive; if the adhesive layer is too thick, adhesive overflow or uneven curing may occur. Furthermore, the amount of adhesive remaining on the paper sealing tape and the beveled edges directly affects the bonding strength, but existing technologies do not perform secondary detection and compensation for the adhesive amount after sealing. Based on this, the inventors propose a staged adhesive amount control strategy, achieving precise control of the adhesive layer thickness through a process of adhesive application detection, dynamic adhesive replenishment or removal, and secondary adhesive amount monitoring and compensation after sealing.

[0031] For this, please refer to Figure 1 and Figure 2 This invention proposes a powder-coated edge banding process for beveled and straight particleboard. The process is applied to an integrated beveled and straight edge banding machine, which includes an adhesive applicator. The adhesive applicator has an adhesive applicator station, a first adhesive replenishment station, an adhesive removal station, and a second adhesive replenishment station distributed sequentially along the conveying direction. The pressing mechanism of the integrated beveled and straight edge banding machine is located between the adhesive removal station and the second adhesive replenishment station. The process includes: S1. Load the paper edge sealing tape into the edge sealing tape storage tray; S2. Feed the particleboard into the bevel and straight edge banding machine and pre-mill it to obtain particleboard with bevel and straight surfaces; S3. The beveled and straight surfaces are sealed by the glue application device and the pressing mechanism, and the particleboard is trimmed and scraped by the beveled and straight integrated edge sealing machine. S4. Grind the particleboard after the edge scraping treatment, and then electrostatically spray powder to obtain the particleboard oblique and straight shaped powder sprayed board. The edge sealing process of the beveled surface using an adhesive applicator and a pressing mechanism includes: S21. Apply glue to the inclined straight surface of the particleboard at the glue application station and check the thickness of the glue layer; S22. If the thickness is less than the preset value, the adhesive layer is applied to the preset thickness at the first adhesive application station; if the thickness exceeds the preset value, the adhesive layer is reduced to the preset thickness at the adhesive removal station. S23. The pressing mechanism seals the paper edge banding onto the inclined straight surface, and the glue application device monitors the glue level between the paper edge banding and the edge of the inclined straight surface. S24. Determine whether the removal conditions are met based on the glue quantity status, wherein the removal conditions include the glue quantity reaching a monitoring threshold. If yes, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine; if no, after applying glue between the paper edge banding tape and the bevel and straight edge at the second glue application station to the monitoring threshold, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine.

[0032] In this invention, the paper sealing strip is made of paper-plastic composite material.

[0033] In existing technology, the oblique and straight integrated edge banding machine realizes the conveying of the board through a conveying mechanism. Along the conveying direction of the conveying mechanism, there are a pre-milling mechanism, a gluing mechanism, a tape feeding mechanism, a pressing mechanism, a trimming mechanism, a tracking mechanism, a scraping mechanism, a flexible flat scraping mechanism, and a polishing mechanism. The pre-milling mechanism is used to pre-mill the side of the board to form the desired shape. In this invention, the oblique and straight shape is prepared on the particleboard by the pre-milling mechanism. The tape feeding mechanism is an edge banding tape storage reel, which is independently set and is generally located on one side of the edge banding machine. It moves along the conveying direction under the traction of an external device and is bonded to the side of the board in the pressing mechanism to achieve the purpose of edge banding the board. After the edge banding is completed, the board is processed by the trimming mechanism, the tracking mechanism, the scraping mechanism, the flexible flat scraping mechanism, and the polishing mechanism to obtain a semi-finished board with a good appearance.

[0034] The present invention adds a first glue application station, a glue removal station and a second glue application station between the glue application mechanism and the pressing mechanism. The second glue application station is located after the pressing mechanism and is used to apply glue to the edge of the sealing tape.

[0035] Correspondingly, the adhesive application mechanism, the first adhesive application station, and the second adhesive application station in this application all use high-temperature resistant PUR adhesive.

[0036] Specifically, adhesive layer thickness detection refers to measuring the actual thickness of the adhesive layer after application using sensors, such as laser rangefinders or capacitive sensors, to determine whether the adhesive amount meets preset standards. The first adhesive replenishment station and adhesive removal station are used to increase or decrease the adhesive amount, for example, through adjustable nozzles or scraper mechanisms, ensuring uniform adhesive layer thickness. Adhesive retention status monitoring of the paper sealing tape and beveled edges refers to detecting the distribution of adhesive after sealing, specifically using infrared scanning devices to obtain gap parameters to assess whether the adhesive filling is sufficient. The monitoring threshold in the removal conditions refers to preset adhesive retention standards, such as those set based on a comprehensive index of gap length, width, and depth, to determine whether the edge sealing is qualified. If qualified, it directly enters the trimming mechanism of the integrated beveled edge sealing machine, and is subsequently processed by the trimming mechanism, trimming mechanism, tracking mechanism, scraping mechanism, flexible flat scraping mechanism, and polishing mechanism. If the quality is not up to standard, the second glue replenishment station will add glue to the monitoring threshold. The board then enters the trimming mechanism of the integrated bevel and straight edge banding machine, and is processed sequentially by the trimming mechanism, edge trimming mechanism, tracking mechanism, edge scraping mechanism, flexible flat edge scraping mechanism, and polishing mechanism. After edge banding by the integrated bevel and straight edge banding machine, the particleboard can be sanded with 600# sandpaper to improve the surface roughness and activity of the paper edge banding, thereby enhancing the adhesion between the powder coating film and the paper edge banding, ensuring uniform powder coating. During sanding, multi-dimensional testing using visual inspection, film charts, and gloss meters is combined to ensure that the product's physical and chemical properties meet the standards, achieving the fifth-level standard for the physical and chemical properties of the bevel and straight edge banding of the particleboard, including resistance to thermal cycling and surface cracking.

[0037] After the particleboard is coated with adhesive by the edge banding machine's glue applicator, the adhesive layer thickness is monitored in real time by sensors. If insufficient adhesive is detected, the first glue replenishment station is activated, precisely replenishing the adhesive using a glue replenishment device. If excessive adhesive is detected, the excess adhesive is removed by a scraper or negative pressure adsorption device at the glue removal station. Subsequently, the pressing mechanism presses the paper edge banding tape onto the edge, scanning the gap parameters of the paper edge banding tape edge with an infrared device. If the gap parameters exceed a preset standard, insufficient adhesive is determined. At this point, the second glue replenishment station performs localized glue replenishment based on the gap location and size until the adhesive level reaches or exceeds the monitoring threshold. For example, when a gap exceeding 5 mm is detected between a section of paper edge banding tape and the edge of the edge, the glue replenishment robot automatically positions itself at that location, selects the corresponding glue nozzle to match the gap width, and completes the glue replenishment at a preset dispensing speed.

[0038] Furthermore, the integrated oblique and straight edge sealing machine also integrates a glue-applying robotic arm along the conveying direction. This robotic arm is used at the second glue-applying station to apply glue between the paper sealing tape and the oblique and straight edge until it exceeds the monitoring threshold. This includes: Monitor the amount of glue remaining on the paper sealing tape and the beveled edge; When the glue level is determined to be below the monitoring threshold, the glue replenishing robot arm replenishes the glue between the paper sealing tape and the beveled edge until it exceeds the monitoring threshold.

[0039] Specifically, the glue-applying robotic arm refers to an automated mechanical device integrated into the conveyor path of the edge banding machine. It can be implemented using a combination structure of a multi-joint robotic arm and a glue gun, linked to a motion control module and a glue quantity monitoring system. The glue quantity status refers to the distribution of glue in the bonding area between the paper edge banding and the board edge. This can be achieved by collecting data in real time using infrared sensors or visual inspection devices to determine if the glue quantity meets bonding requirements. The monitoring threshold refers to preset glue layer thickness or volume parameters, which can be experimentally calibrated based on the paper edge banding material and the angle of the board's inclined surface. This threshold serves as the critical condition for triggering the glue-applying action. After the initial bonding of the paper sealing tape and the beveled edge is completed, the glue level is monitored in real time using an infrared device. When the glue level in a local area falls below the monitoring threshold, the glue-replenishing robotic arm is activated and moves to the target position, precisely injecting additional glue into the gap using a glue gun. The movement trajectory and glue dispensing volume of the glue gun are dynamically adjusted by the control system based on the gap location and glue level gap to ensure uniform glue coverage of the bonding surface. During the glue replenishment process, the joint angle of the robotic arm and the posture of the glue gun automatically adapt to changes in the beveled edge angle to prevent glue overflow or insufficient filling.

[0040] Please see Figure 3 As shown, it is a logic diagram for monitoring the glue content of the paper sealing strip and the beveled edge in an embodiment of the present invention.

[0041] Specifically, monitoring the amount of adhesive remaining at the paper sealing tape and the beveled edges includes: The location, length, width, and depth of the gap between the paper sealing strip and the beveled edge are obtained using an infrared device. The glue level at the corresponding gap location is determined based on the gap length, gap width, and gap depth. The glue level status includes whether the glue level has reached the monitoring threshold or not. When the gap length does not exceed the preset standard gap length, the gap width does not exceed the preset standard gap width, and the gap depth does not exceed the preset standard gap depth, the glue level at the corresponding gap location is determined to have reached the monitoring threshold. When the gap length is greater than the preset standard gap length, or the gap width is greater than the preset standard gap width, or the gap depth is greater than the preset standard gap depth, the glue level at the corresponding gap location is determined to have not reached the monitoring threshold.

[0042] An infrared device is a device that emits and receives infrared rays to detect the surface morphology of an object. Specifically, it can be implemented using an infrared sensor with high-resolution imaging capabilities, acquiring three-dimensional data of the gap through infrared scanning. The standard gap length, standard gap width, and standard gap depth refer to pre-set maximum allowable gap size parameters. These can be set according to the material characteristics of the paper sealing tape and the adhesive bonding strength requirements. For example, the standard gap length could be 5 mm, the standard gap width 0.2 mm, and the standard gap depth 0.1 mm. The adhesive level refers to the degree of adhesive filling between the paper sealing tape and the beveled edge. This is indirectly reflected by the gap size parameters; when the gap size exceeds the preset standard, it indicates insufficient adhesive and requires re-adhesion.

[0043] During the monitoring of adhesive levels at the paper sealing tape and the beveled edge, an infrared device scans the seam area to obtain data on the location, length, width, and depth of the gap. This data is transmitted to the control system and compared with preset standard gap dimensions. When the gap length, width, and depth do not exceed the preset standards, it indicates sufficient adhesive filling, and no additional adhesive is needed. When any gap parameter exceeds the preset standard, it indicates insufficient adhesive, triggering an adhesive replenishment operation. For example, if a gap length of 6 mm is detected and the standard gap length is 5 mm, it is determined that the adhesive level at that location is insufficient, and additional adhesive needs to be replenished.

[0044] By employing the above technical solution and utilizing an infrared device to obtain the gap position, gap length, gap width, and gap depth between the paper sealing tape and the beveled edge, the real-time performance and accuracy of gap data acquisition are improved. Furthermore, by determining the glue content in the gap using preset judgment conditions, a reliable data foundation is provided for subsequent scientific and effective glue replenishment.

[0045] Furthermore, the glue-applying robotic arm includes a base, a first robotic arm, a second robotic arm, and a glue gun. One end of the base is fixedly connected to the main body of the inclined and straight integrated edge banding machine. The other end of the base is rotatably connected to one end of the first robotic arm via a first joint. The other end of the first robotic arm is rotatably connected to one end of the second robotic arm via a second joint. The other end of the second robotic arm is rotatably connected to the glue gun via a third joint. The glue gun includes several nozzles, which are used to select the appropriate nozzle for glue application based on the glue application area and amount.

[0046] The base refers to the fundamental support structure that bears the movement of the robotic arm. It can be made of high-strength alloy material and bolted to the main body of the edge banding machine. Its function is to provide a stable motion reference for the robotic arm. The first and second robotic arms refer to the transmission structure connected by joints. This can be achieved by using a multi-axis servo motor to drive the rotary joints. Its function is to adjust the spatial position of the glue gun through multi-degree-of-freedom movement. The glue gun is the end effector used to spray glue. It can be implemented using a modular design with detachable multi-specification nozzles. Its function is to dynamically match the nozzle type according to the gap size to control the glue dispensing amount.

[0047] When the infrared device detects a gap between the paper sealing strip and the beveled edge, the glue-applying robotic arm adjusts the spatial orientation of the glue gun through the coordinated rotation of the first, second, and third joints, aligning the glue nozzle with the gap. The nozzle type is selected based on the width and depth of the gap. For example, a needle-shaped nozzle is used when the gap width is less than 1 mm, a flat nozzle is used when the gap width is between 1 and 3 mm, and a fan-shaped nozzle is used when the gap width is greater than 3 mm. The glue dispensing speed of the glue gun is dynamically adjusted by controlling the glue pump pressure via a servo motor. For example, the dispensing speed is set to 0.2 ml per second when the gap depth is 0.5 mm, and increases to 0.5 ml per second when the depth increases to 1 mm.

[0048] In this embodiment, by setting joint rotational connections between the base of the glue-applying robotic arm, the first robotic arm, the second robotic arm, and the glue gun, the robotic arm can rotate 360° in all directions, improving the flexibility of the glue-applying robotic arm in applying glue.

[0049] Specifically, the inclined plane includes the inclined plane and the straight plane, wherein the angle between the inclined plane and the horizontal plane is in the range of 0-90°, and the angle between the straight plane and the horizontal plane is 90°.

[0050] Please see Figure 4 As shown, it is a flowchart of the glue-applying robotic arm applying glue between the paper sealing strip and the beveled edge to a level above the monitoring threshold in an embodiment of the present invention.

[0051] Specifically, the glue-applying robotic arm applies glue between the paper sealing tape and the beveled edge until it exceeds the monitoring threshold, including: S41. Determine whether the gap is on the edge of the paper sealing strip or on the edge of the inclined plane based on the gap position between the paper sealing strip and the edge of the inclined plane. When the gap is on the edge of the paper sealing strip and the edge of the inclined plane, determine the working angle of the glue nozzle of the glue-applying robot arm as the angle between the inclined plane and the horizontal plane; when the gap is on the edge of the paper sealing strip and the edge of the straight plane, determine the working angle of the glue nozzle of the glue-applying robot arm as 90°. S42. Determine the walking path and speed of the glue-applying robotic arm based on the location of the gap; S43. Determine the nozzle type based on the average gap width per unit length along the gap length direction; S44. Calculate the amount of glue applied per unit length based on the average gap width and gap depth per unit length, and determine the initial glue dispensing speed of the nozzle based on the amount of glue applied per unit length.

[0052] By using a robotic arm to apply glue between the paper sealing tape and the beveled edge, the glue application accuracy of the beveled edge is improved. Furthermore, by determining the working angle of the glue nozzle on either the paper sealing tape and the beveled edge or the beveled edge, the accuracy of the glue nozzle operation is improved, enhancing both the quality and efficiency of glue application. The nozzle type is determined based on the average gap width per unit length along the gap length, enabling nozzle selection. Finally, the glue application amount per unit length is calculated based on the average gap width and gap depth, allowing for segmented glue application measurement and improving the accuracy of determining the application amount.

[0053] Specifically, the system acquires the gap length, gap width, and gap depth in real time, calculates the remaining glue amount, and adjusts the initial glue dispensing speed to the actual glue dispensing speed based on the remaining glue amount. Please see Figure 5 As shown, it is a logic diagram of adjusting the initial dispensing speed to the actual dispensing speed according to the remaining amount of glue in an embodiment of the present invention.

[0054] Determine if the remaining amount of adhesive is within the preset standard adhesive application threshold: If so, adjust the actual glue dispensing speed to the initial glue dispensing speed; If not, the actual dispensing speed is adjusted to be the product of the dispensing speed adjustment coefficient and the initial dispensing speed.

[0055] The system can acquire gap length, gap width, and gap depth in real time, calculate the remaining glue amount, and adjust the initial glue dispensing speed based on the remaining glue amount to obtain the actual glue dispensing speed, thus achieving a scientific and effective determination of the actual glue dispensing speed.

[0056] Specifically, the glue dispensing speed adjustment coefficient includes a first adjustment coefficient and a second adjustment coefficient. When the remaining amount of glue exceeds the maximum standard amount of glue in the preset standard glue amount threshold, the first adjustment coefficient is the ratio of the remaining amount of glue to the maximum standard amount of glue. When the remaining amount of glue is less than the minimum standard glue amount among the preset standard glue amount thresholds, the second adjustment coefficient is the ratio of the remaining amount of glue to the minimum standard glue amount.

[0057] In this embodiment, the remaining amount of adhesive is denoted as Qjy, and the preset standard adhesive replenishment threshold range is [Qjsl, Qjsh], where Qjsl is the minimum standard adhesive replenishment amount and Qjsh is the maximum standard adhesive replenishment amount. Therefore: The first adjustment coefficient is calculated to be α1 = Qjy / Qjsh, where α1 > 1; The second adjustment coefficient α2 is calculated to be α2 = Qjy / Qjsl, where 0 < α1 < 1.

[0058] The glue dispensing speed adjustment coefficient is determined by comparing the remaining glue amount with the preset standard glue dispensing threshold range, thereby improving glue dispensing efficiency and accuracy.

[0059] Specifically, determining the movement path of the glue-applying robotic arm based on the location of the gap includes: The glue-applying robotic arm moves along the paper sealing strip and the edge of the inclined straight surface according to the working angle. When it is determined that there is no gap on the edge of the inclined straight surface, the glue-applying robotic arm raises the glue nozzle a preset distance in the opposite direction of the working angle. When it is determined that there is a gap on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the direction of the working angle to apply glue to the gap.

[0060] By determining the travel path of the glue-applying robotic arm based on the location of the gap, when it is determined that there is no gap on the edge of the inclined straight surface, the glue-applying robotic arm is raised in the opposite direction of the working angle. When it is determined that there is a gap on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the direction of the working angle to apply glue to the gap. This allows the glue-applying robotic arm to flexibly switch working angles for inclined and straight edge gaps, improving the flexibility and accuracy of glue application for edge sealing on inclined straight surfaces.

[0061] Specifically, determining the walking speed of the glue-applying robotic arm based on the location of the gap includes: When the glue-applying robotic arm raises the nozzle a preset distance in the opposite direction of the working angle, it is determined that the glue-applying robotic arm is in an idle running state, and the walking speed is adjusted according to the idle running distance. In this embodiment, when the glue-applying robotic arm is in an idle running state, the walking speed of the glue-applying arm is positively correlated with the idle running distance.

[0062] When there are gaps on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the working angle direction to fill the gaps with glue, and the walking speed is adjusted according to the actual glue dispensing speed.

[0063] During the glue application process, when a gap is detected between the paper sealing tape and the beveled edge, the glue application robot arm adjusts the nozzle angle according to the gap location and moves along the beveled edge. If there is no gap to be glued on the current movement path, the nozzle is raised to a preset height and enters a no-load state. At this time, the control system automatically increases the walking speed based on the remaining no-load distance, shortening the non-working time. When a gap to be glued is detected ahead, the nozzle drops to the working angle, and the glue dispensing speed is dynamically adjusted according to the real-time calculated remaining glue amount, so that the glue flow rate released by the glue gun is synchronized with the robot arm's walking speed, ensuring that the glue evenly fills the gap without overflowing.

[0064] Through the above technical solution, the present invention can automatically switch the walking speed mode according to the glue filling operation status, quickly cross the seamless area during the empty walking stage, and accurately control the glue filling rate during the glue filling stage, thereby reducing production cycle waste, avoiding paper sealing tape wrinkles or glue residue problems caused by mismatch between glue amount and moving speed, and improving the automation level and processing quality of the oblique and straight sealing process.

[0065] In this embodiment, the walking speed of the glue-applying robotic arm is positively correlated with the actual glue dispensing speed.

[0066] Compared with the prior art, the edge sealing process for powder coating of particleboard with oblique and straight shapes provided by the present invention has the following beneficial effects: 1) The glue application device detects the glue layer thickness at the glue application station and applies the glue layer to the preset thickness at the first glue application station, or removes excess glue at the glue removal station to ensure the uniformity of glue application. This avoids the problems of excessive glue application leading to residual glue overflow and insufficient glue application leading to adhesion failure, which are common with traditional glue application. At the same time, the second glue application station monitors the gap parameters after sealing the edge with an infrared device. When the gap exceeds the standard threshold, the glue application robot arm accurately applies glue to the monitoring threshold, thereby improving the peel strength and solving the defects of edge lifting and detachment.

[0067] 2) The glue-applying robotic arm adjusts the nozzle angle through multi-joint rotation, which can adapt to 0-90° inclined surfaces and 90° straight surfaces. This ensures that the nozzle is in direct contact with the inclined or straight surfaces, avoiding problems such as insufficient glue or overflow due to angle deviation. At the same time, the glue-applying robotic arm automatically adjusts the working angle of the nozzle according to the angle of the inclined or straight surface, and controls the walking path through gap detection and nozzle lifting and lowering logic. This can effectively avoid problems such as paper sealing tape cracking due to hard contact or wrinkles caused by nozzle angle deviation.

[0068] 3) Dynamically adjust the dispensing speed by adjusting the remaining amount of glue: When the remaining amount of glue exceeds the standard threshold, the first adjustment coefficient (remaining amount of glue / maximum amount of glue) increases the dispensing speed; when the amount of glue is insufficient, the second adjustment coefficient (remaining amount of glue / minimum amount of glue) decreases the dispensing speed to ensure uniform glue layer filling and eliminate defects such as excessive glue causing bulging and insufficient glue causing cracking.

[0069] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A powder-coating edge-sealing process for particleboard with oblique and straight shapes, characterized in that, The process is applied to a beveled and straight integrated edge banding machine, which includes an adhesive application device. The adhesive application device has an adhesive application station, a first adhesive replenishment station, an adhesive removal station, and a second adhesive replenishment station arranged sequentially along the conveying direction. The pressing mechanism of the beveled and straight integrated edge banding machine is located between the adhesive removal station and the second adhesive replenishment station. The process includes: Load the paper edge sealing tape into the edge sealing tape storage tray; The particleboard is fed into the bevel and straight edge banding machine and pre-milled to obtain particleboard with bevel and straight surfaces; The beveled and straight surfaces are sealed using an adhesive applicator and a pressing mechanism, while the particleboard is trimmed and scraped using an integrated beveled and straight edge sealing machine. After the particleboard is scraped, it is sanded and then electrostatically powder-coated to produce a particleboard with a slanted and straight shape. The edge sealing process of the beveled surface using an adhesive applicator and a pressing mechanism includes: At the glue application station, glue is applied to the inclined straight surface of the particleboard and the thickness of the glue layer is measured. If the thickness is less than the preset value, the adhesive layer is applied to the preset thickness at the first adhesive application station; if the thickness exceeds the preset value, the adhesive layer is reduced to the preset thickness at the adhesive removal station. The pressing mechanism seals the paper edge banding onto the inclined straight surface, and the glue application device monitors the glue level between the paper edge banding and the edge of the inclined straight surface. The removal conditions are determined based on the glue level, including the glue level reaching a monitoring threshold. If yes, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine; if no, after applying glue between the paper edge banding tape and the bevel and straight edge at the second glue application station to the monitoring threshold, move the particleboard to the trimming mechanism of the bevel and straight edge banding machine. The integrated oblique and straight edge sealing machine also integrates a glue-applying robotic arm along the conveying direction. This robotic arm is used at the second glue-applying station to apply glue between the paper sealing tape and the oblique and straight edge until it exceeds the monitoring threshold. This includes: Monitor the amount of glue remaining on the paper sealing tape and the beveled edge; When the glue level is determined to be below the monitoring threshold, the glue replenishing robot arm replenishes the glue between the paper sealing tape and the beveled edge to above the monitoring threshold. The monitoring of the glue level at the edge of the paper sealing tape and the beveled edge includes: The location, length, width, and depth of the gap between the paper sealing tape and the beveled edge are obtained using an infrared device. The glue level at the corresponding gap location is determined based on the gap length, gap width, and gap depth. The glue level includes whether the glue level has reached a monitoring threshold or not. When the gap length does not exceed a preset standard gap length, the gap width does not exceed a preset standard gap width, and the gap depth does not exceed a preset standard gap depth, the glue level at the corresponding gap location is determined to have reached the monitoring threshold. When the gap length is greater than a preset standard gap length, or the gap width is greater than a preset standard gap width, or the gap depth is greater than a preset standard depth, the glue level at the corresponding gap location is determined to have not reached the monitoring threshold.

2. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 1, characterized in that, The glue-applying robotic arm includes a base, a first robotic arm, a second robotic arm, and a glue gun. One end of the base is fixedly connected to the main body of the oblique and straight integrated edge banding machine. The other end of the base is rotatably connected to one end of the first robotic arm via a first joint. The other end of the first robotic arm is rotatably connected to one end of the second robotic arm via a second joint. The other end of the second robotic arm is rotatably connected to the glue gun via a third joint. The glue gun includes several nozzles for selecting the appropriate nozzle for glue application based on the glue application area and amount.

3. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 2, characterized in that, The inclined plane includes an inclined plane and a straight plane, wherein the angle between the inclined plane and the horizontal plane is in the range of 0-90°, and the angle between the straight plane and the horizontal plane is 90°.

4. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 3, characterized in that, The glue-applying robotic arm applies glue between the paper sealing tape and the beveled edge until it exceeds the monitoring threshold, including: The location of the gap between the paper sealing strip and the edge of the inclined straight surface is determined based on whether the gap is on the paper sealing strip and the edge of the inclined surface or on the edge of the straight surface. When the gap is on the paper sealing strip and the edge of the inclined surface, the working angle of the glue nozzle of the glue-applying robot arm is determined to be the angle between the inclined surface and the horizontal plane; when the gap is on the paper sealing strip and the edge of the straight surface, the working angle of the glue nozzle of the glue-applying robot arm is determined to be 90°. The walking path and speed of the glue-applying robotic arm are determined based on the location of the gap. The nozzle type is determined based on the average gap width per unit length along the gap length direction; The amount of glue applied per unit length is calculated based on the average gap width and gap depth per unit length, and the initial glue dispensing speed of the nozzle is determined based on the amount of glue applied per unit length.

5. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 4, characterized in that, The system acquires the gap length, gap width, and gap depth in real time, calculates the remaining glue amount, and adjusts the initial glue dispensing speed to the actual glue dispensing speed based on the remaining glue amount. When the remaining amount of glue is within the preset standard glue amount threshold range, the actual glue dispensing speed is adjusted to the initial glue dispensing speed; When the remaining glue amount exceeds the preset standard glue amount threshold range, the actual glue dispensing speed is adjusted to be the product of the glue dispensing speed adjustment coefficient and the initial glue dispensing speed.

6. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 5, characterized in that, The dispensing speed adjustment coefficient includes a first adjustment coefficient and a second adjustment coefficient. When the remaining amount of glue exceeds the maximum standard amount of glue in the preset standard glue amount threshold, the first adjustment coefficient is the ratio of the remaining amount of glue to the maximum standard amount of glue. When the remaining amount of adhesive is less than the minimum standard amount of adhesive in the preset standard amount of adhesive, the second adjustment coefficient is the ratio of the remaining amount of adhesive to the minimum standard amount of adhesive.

7. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 6, characterized in that, Determining the travel path of the glue-applying robotic arm based on the location of the gap includes: the glue-applying robotic arm travels along the paper sealing strip and the edge of the inclined straight surface according to the working angle; when it is determined that there is no gap on the edge of the inclined straight surface, the glue-applying robotic arm raises the glue nozzle a preset distance in the opposite direction of the working angle; when it is determined that there is a gap on the edge of the inclined straight surface, the glue-applying robotic arm lowers the glue nozzle in the direction of the working angle to apply glue to the gap.

8. The edge-sealing process for powder coating of particleboard with oblique and straight shapes according to claim 7, characterized in that, Determining the walking speed of the glue-applying robotic arm based on the gap position includes: when the glue-applying robotic arm raises the nozzle a preset distance in the opposite direction of the working angle, it is determined that the glue-applying robotic arm is in an idle running state, and the walking speed is adjusted according to the idle running distance; when there is a gap on the edge of the inclined straight surface, when the glue-applying robotic arm lowers the nozzle in the working angle direction to apply glue to the gap, the walking speed is adjusted according to the actual glue dispensing speed.

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