Roller coating device for curved-edge special-shaped furniture plate and roller coating process of roller coating device

Abstract

The invention relates to the technical field of furniture manufacturing, in particular to a roller coating device for curved-edge special-shaped furniture plates and a roller coating process thereof.The roller coating device comprises a central rotating shaft arranged above a plate conveying path in a crossing mode, and the central rotating shaft is coaxially sleeved with two transmission rings through spline fit; a flexible hollow roller arranged outside the central rotating shaft in a sleeving mode is arranged between the two transmission rings, the two ends of the flexible hollow roller are fixedly connected with the outer rings of the two transmission rings in a sleeving mode respectively, and the transmission rings are both connected with axial driving parts in a matched mode. And thus, a bulging coating area adaptive to the curved surface of the plate is formed. The device effectively solves the problem that a traditional rigid roller body cannot actively adapt to the special-shaped curved surface, so that coating missing or uneven coating is caused, and the coating quality of the special-shaped plate is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of furniture manufacturing technology, specifically to a roller coating device and roller coating process for curved and irregularly shaped furniture panels. Background Technology

[0002] In the furniture manufacturing industry, roller coating has become the mainstream method for coating the surface of boards due to its advantages such as high production efficiency, uniform coating and high paint utilization rate. It is especially mature in the processing of flat boards.

[0003] However, with the continuous development of furniture design aesthetics, irregularly shaped furniture panels with curved shapes or undulating surfaces are increasingly accounting for a significant portion of the market. Existing roller coating equipment exhibits obvious structural limitations when processing such non-planar panels. Specifically, traditional coating rollers typically have fixed radial dimensions and straight axial profiles, with a constant geometry. During the coating process, although the rubber layer on the roller surface has a certain degree of elasticity, this slight deformation generated by passive pressure cannot adapt to panels with significant curvature variations or pronounced surface undulations.

[0004] When rigid or semi-rigid cylindrical rollers come into contact with materials having raised or recessed curved surfaces, the rollers cannot actively change their contour shape to conform to the workpiece surface, often only achieving localized line contact or point contact. This leads to incomplete coating in the recessed areas of the material surface, while the raised areas may have excessively thin paint films or paint build-up at the edges due to excessive contact pressure, making it difficult to ensure the uniformity and integrity of the overall coating on irregular curved surfaces. Summary of the Invention

[0005] Therefore, it is necessary to provide a roller coating device and roller coating process for curved and irregularly shaped furniture panels to address the existing technical problems.

[0006] To address the existing technical problems, the present invention adopts the following technical solution: a roller coating device for curved and irregularly shaped furniture panels, comprising a central rotating shaft spanning above the panel conveying path, wherein two transmission rings are coaxially fitted on the central rotating shaft via splines, and the two transmission rings are spaced apart along the axial direction of the central rotating shaft; a flexible hollow roller fitted outside the central rotating shaft is provided between the two transmission rings, wherein the two ends of the flexible hollow roller are respectively fixedly fitted to the outer rings of the two transmission rings; each transmission ring is fitted with an axial driving member, which is configured to drive the two transmission rings to move towards each other, thereby axially compressing the flexible hollow roller to produce radial deformation, thereby forming a raised coating area adapted to the surface morphology of the panel in the middle of the flexible hollow roller; and a paint supply mechanism for supplying paint to the surface of the raised coating area is provided on the side of the flexible hollow roller.

[0007] Furthermore, the inner circumferential wall of the flexible hollow roller is integrally formed with several guide deformation ribs, and the several guide deformation ribs form a diamond-shaped grid structure on the inner wall of the flexible hollow roller.

[0008] Furthermore, both ends of the central rotating shaft are splined portions, and the outer surface of each splined portion is formed with a ring of outwardly protruding spline teeth. The inner ring of each transmission ring is provided with a spline groove that mates with the spline teeth.

[0009] Furthermore, both ends of the central rotating shaft are provided with support platforms, and the axial driving component is a linear motor fixed to the top of the support platform. The output direction of the linear motor is parallel to the axial direction of the central rotating shaft, and the output end of the linear motor is connected to the corresponding transmission ring through a rotational decoupling mechanism.

[0010] Furthermore, the rotary decoupling mechanism includes a planar bearing and a connecting rod. Each transmission ring has an annular mounting groove extending inward at the end facing the linear motor. The planar bearing is located in the annular mounting groove. Each transmission ring has a limiting ring fixed at the end facing the linear motor. The inner ring of the limiting ring extends toward the opening of the annular mounting groove. The connecting rod connects the planar bearing seat to the output end of the linear motor.

[0011] Furthermore, each support platform is fixedly provided with a bracket on its top, and the bracket is fixedly provided with a first shaft seat. Each spline portion of the central rotating shaft is coaxially formed with an outwardly extending insertion portion that is connected to the first shaft seat.

[0012] Furthermore, the paint supply mechanism includes a paint-spreading roller and a paint scraper. The paint-spreading roller is arranged parallel to the flexible hollow roller and is located obliquely above the flexible hollow roller. The paint-spreading roller presses down the bulging coating area. The paint scraper is located beside the paint-spreading roller and extends along the axial direction of the paint-spreading roller. The paint scraper is inclined downward and its cutting edge is in contact with the outer peripheral wall of the paint-spreading roller.

[0013] Furthermore, the bracket is also fixedly provided with a second shaft seat, and both ends of the paint-spreading roller are respectively connected to the second shaft seat.

[0014] Furthermore, the paint scraper is provided with a paint-blocking frame perpendicular to its surface on the outer side of its blade edge. The paint-blocking frame includes an axial baffle and two lateral baffles. The axial baffle extends along the axial direction of the paint-spreading roller. The two lateral baffles are symmetrically connected to both ends of the axial baffle. One end of each lateral baffle is formed with an arc-shaped surface that fits against the outer surface of the paint-spreading roller. Each support platform is fixedly provided with a support frame on its top. The two ends of the paint-blocking frame are fixedly connected to the two support frames respectively.

[0015] A roller coating process for curved and irregularly shaped furniture panels, the roller coating process comprising the following steps: S1. Use visual inspection equipment to obtain the width parameters of the board to be coated, and identify the surface morphology and groove information of the board. S2. Based on the width of the sheet material, control the axial drive component to drive the two transmission rings to move towards each other, so as to compress the flexible hollow roller and cause the center of the flexible hollow roller to expand radially, ultimately forming a bulging coating area with a width greater than that of the sheet material. S3. The drive center shaft drives the flexible hollow roller to rotate and supplies paint to the bulging coating area through the paint supply mechanism. S4. Place the sheet material on the multi-degree-of-freedom conveying platform and control the sheet material to pass under the flexible hollow roller along the conveying path. During the conveying process, according to the slot position information identified in step one, control the multi-degree-of-freedom conveying platform to dynamically adjust the conveying posture of the sheet material and change the relative angle between the sheet material and the flexible hollow roller. S5. Utilizing the interference contact and flexible deformation between the bulging coating area of ​​the flexible hollow roller and the surface of the board, and in conjunction with the posture adjustment of the board, multi-angle coordinated roller coating is performed on the curved surface and side grooves of the board.

[0016] The beneficial effects of this invention compared to the prior art are: This invention overcomes the limitations of traditional rigid rollers in adapting to irregular curved surfaces by utilizing the active radial deformation mechanism of a flexible hollow roller, achieving high-quality contour coating for curved and irregularly shaped panels. Specifically, the flexible hollow roller of this invention uses an axial drive component to apply axial pressure, forcing itself to undergo controlled radial expansion. This creates a dynamically adjustable bulging coating area in the center of the roller, which acts like a "flexible airbag" to actively conform to the complex morphology of the panel surface. For low-lying areas of the panel surface, the bulging roller surface can deeply fill them, eliminating coating dead corners; for raised areas, the flexible roller surface can flexibly cover them, avoiding edge paint buildup or paint film damage caused by hard contact. Furthermore, by controlling the degree of axial compression, the bulging amplitude and contact area of ​​the flexible hollow roller can be precisely adjusted, allowing the same device to adapt to irregularly shaped panels with different radii of curvature. This significantly improves the versatility of the equipment and the precision of the coating operation, ultimately ensuring complete and uniform paint coverage on the surface of curved and irregularly shaped furniture panels. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a planar sectional view of a flexible hollow roller; Figure 4 This is a top view of the present invention; Figure 5 yes Figure 4 Sectional view along line AA; Figure 6 yes Figure 5 A magnified view of the area indicated by A1 in the diagram; Figure 7 yes Figure 4 Sectional view along BB line Figure 8 It is an exploded three-dimensional structural diagram of the transmission ring and the central rotating shaft; Figure 9 It is a planar cross-sectional view of a flexible hollow roller pressing against the flat surface of a sheet.

[0018] The following are the labels in the diagram: 1. Central rotating shaft; 2. Transmission ring; 3. Flexible hollow roller; 4. Bulging coating area; 5. Guide deformation rib; 6. Spline tooth; 7. Spline groove; 8. Support platform; 9. Linear motor; 10. Surface bearing; 11. Connecting rod; 12. Annular mounting groove; 13. Limiting ring; 14. Bracket; 15. First shaft seat; 16. Insertion part; 17. Equalizing roller; 18. Paint scraper; 19. Second shaft seat; 20. Axial baffle; 21. Lateral baffle; 22. Arc-shaped surface; 23. Support frame. Detailed Implementation

[0019] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0020] refer to Figures 1 to 9 As shown, this invention provides a roller coating device for curved and irregularly shaped furniture panels. Its core structure includes a central rotating shaft 1 spanning above the panel conveying path and a flexible hollow roller 3 sleeved on the outside of the central rotating shaft 1. To ensure the stability and resilience of the flexible hollow roller 3 during deformation, several guide deformation ribs 5 are integrally formed on the inner circumferential wall of the flexible hollow roller 3, and these guide deformation ribs 5 form a diamond-shaped mesh structure on the inner wall of the flexible hollow roller 3. When compressed, this diamond-shaped mesh structure guides the flexible hollow roller 3 to expand outwards uniformly. Two transmission rings 2 are fixedly sleeved on the outer rings of both ends of the flexible hollow roller 3. These two transmission rings 2 are coaxially sleeved on the central rotating shaft 1 and spaced apart along the axial direction of the central rotating shaft 1, thereby positioning the flexible hollow roller 3 between the two transmission rings 2.

[0021] To achieve power transmission and deformation control, the central shaft 1 is connected to the two transmission rings 2 via a spline connection. Specifically, the ends of the central shaft 1 are designed as splined sections, with each splined section having a ring of outwardly protruding spline teeth 6 on its outer surface. Each transmission ring 2 has a spline groove 7 on its inner ring that mates with the spline teeth 6. This splined connection structure allows the two transmission rings 2 to rotate synchronously with the central shaft 1 and also to slide axially on it, thereby driving the flexible hollow roller 3, which is fixed to it, to rotate and deform synchronously.

[0022] To provide stable support for the central shaft 1 and its components, support platforms 8 are provided at both ends of the central shaft 1. A bracket 14 is fixedly mounted on the top of each support platform 8, and a first bearing seat 15 is fixedly mounted on the bracket 14. Each spline portion of the central shaft 1 has a coaxially formed insertion portion 16 that extends outward and connects to the first bearing seat 15, thereby enabling the central shaft 1 to rotate stably via the first bearing seat 15.

[0023] To drive the flexible hollow roller 3 to deform, each transmission ring 2 is connected to an axial drive component. The specific structure is as follows: the axial drive component is a linear motor 9 fixed to the top of the support platform 8, and the output direction of the linear motor 9 is parallel to the axis of the central rotating shaft 1. Since the linear motor 9 is a stationary component, while the transmission ring 2 is a rotating component, the output end of the linear motor 9 is connected to the corresponding transmission ring 2 through a rotational decoupling mechanism. This rotational decoupling mechanism includes a planar bearing 10 and a connecting rod 11. Each transmission ring 2 has an annular mounting groove 12 extending inwards from the end facing the linear motor 9. The planar bearing 10 is located within the annular mounting groove 12. To prevent the planar bearing 10 from falling off, a limiting ring 13 is fixedly provided at the end of each transmission ring 2 facing the linear motor 9. The inner ring of the limiting ring 13 extends towards the opening of the annular mounting groove 12 to block the planar bearing 10. One end of the connecting rod 11 is connected to the side of the planar bearing 10 that does not rotate with the transmission ring 2, and the output end of the linear motor 9 is connected to the connecting rod 11. The axial drive is configured to drive the two transmission rings 2 to move toward each other, push the plane bearing 10 through the connecting rod 11, and then push the transmission rings 2 to slide along the spline portion, so as to axially compress the flexible hollow roller 3 to produce radial deformation, thereby forming a raised coating area 4 in the middle of the flexible hollow roller 3 that adapts to the surface morphology of the plate.

[0024] A paint supply mechanism is provided beside the flexible hollow roller 3 to supply paint to the surface of the raised coating area 4, thereby achieving uniform coating of the paint. The paint supply mechanism includes a paint-spreading roller 17 and a paint scraper 18. The paint-spreading roller 17 is arranged parallel to the flexible hollow roller 3 and is located obliquely above the flexible hollow roller 3. In order to fix the paint-spreading roller 17, a second bearing seat 19 is also fixedly provided on the bracket 14, and both ends of the paint-spreading roller 17 are respectively connected to the second bearing seat 19. The position of the paint-spreading roller 17 is arranged so that it can press the raised coating area 4 inward, thereby ensuring close contact between the two and facilitating paint transfer. The paint scraper 18 is located beside the paint-spreading roller 17. The paint scraper 18 extends along the axial direction of the paint-spreading roller 17 and is inclined downward. Its cutting edge is in contact with the outer peripheral wall of the paint-spreading roller 17 to control the paint film thickness on the surface of the paint-spreading roller 17. To prevent paint splattering and waste, the paint scraper 18 has a paint-blocking frame fixed to its outer edge perpendicular to its surface. The paint-blocking frame includes an axial baffle 20 and two lateral baffles 21. The axial baffle 20 extends along the axial direction of the paint-spreading roller 17, and the two lateral baffles 21 are symmetrically fixed to both ends of the axial baffle 20. Each lateral baffle 21 has an arc-shaped surface 22 at one end that fits against the outer surface of the paint-spreading roller 17, thus forming a semi-enclosed paint storage space. To support the paint-blocking frame, a support frame 23 is fixedly installed on the top of each support platform 8, and both ends of the paint-blocking frame are fixedly connected to the two support frames 23.

[0025] Based on the above-described apparatus, this embodiment also provides a roller coating process for curved and irregularly shaped furniture panels.

[0026] The first step of this roller coating process is to use a visual inspection device to obtain the width parameters of the material to be coated and to identify the surface morphology and groove information of the material. This information will serve as the basis for subsequent control.

[0027] In step two, based on the width of the sheet material, the axial drive component, i.e., the linear motor 9, is started, driving the two transmission rings 2 to move towards each other. During the movement, the transmission rings 2 compress the flexible hollow roller 3, causing the center of the flexible hollow roller 3 to expand radially. Supported by the guide deformation ribs 5, a raised coating area 4 with a width greater than that of the sheet material is finally formed, ensuring that the coating area can completely cover the processed surface of the sheet material.

[0028] In step three, the drive center shaft 1 rotates, which drives the transmission ring 2 and the flexible hollow roller 3 to rotate via the spline, and supplies paint to the bulging coating area 4 through the paint supply mechanism; the paint is restricted by the paint baffle frame between the paint leveling roller 17 and the paint scraper 18, and is evenly transferred to the surface of the bulging coating area 4 of the flexible hollow roller 3 by the paint leveling roller 17.

[0029] Steps four and five are crucial for achieving complex surface coating. In step four, the sheet material is placed on a multi-degree-of-freedom conveyor platform, and the material is controlled to pass under the flexible hollow roller 3 along the conveyor path. During the conveying process, the system dynamically adjusts the conveying posture of the sheet material based on the slot position information identified in step one, changing the relative angle between the sheet material and the flexible hollow roller 3. For example, when encountering a deep side slot, the multi-degree-of-freedom conveyor platform tilts the sheet material, exposing the slot on the contact path of the flexible hollow roller 3. In step five, utilizing the interference contact and flexible deformation between the bulging coating area 4 of the flexible hollow roller 3 and the sheet material surface, the flexible hollow roller 3 can adaptively cover the protrusions or depressions on the sheet material surface. Combined with the posture adjustment of the sheet material, multi-angle collaborative roller coating is performed on the curved surface and side slot of the sheet material, thus solving the problems of difficult curved surface bonding and inability to fully cover the slot in traditional processes, achieving high-precision coating without dead angles.

[0030] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A roller coating device for curved and irregularly shaped furniture panels, characterized in that, The system includes a central rotating shaft (1) that spans the conveying path of the sheet material. The central rotating shaft (1) is coaxially fitted with two transmission rings (2) via splines. The two transmission rings (2) are spaced apart along the axial direction of the central rotating shaft (1). A flexible hollow roller (3) is fitted outside the central rotating shaft (1) between the two transmission rings (2). The two ends of the flexible hollow roller (3) are fixedly fitted with the outer rings of the two transmission rings (2). Each transmission ring (2) is connected to an axial drive member. The axial drive member is configured to drive the two transmission rings (2) to move towards each other, thereby axially pressing the flexible hollow roller (3) to cause radial deformation, thereby forming a raised coating area (4) in the middle of the flexible hollow roller (3) that adapts to the surface morphology of the sheet material. A paint supply mechanism for supplying paint to the surface of the raised coating area (4) is provided on the side of the flexible hollow roller (3).

2. The roller coating device for curved and irregularly shaped furniture panels according to claim 1, characterized in that, The inner circumferential wall of the flexible hollow roller (3) is integrally formed with several guide deformation ribs (5), and the several guide deformation ribs (5) form a diamond-shaped grid structure on the inner wall of the flexible hollow roller (3).

3. A roller coating device for curved and irregularly shaped furniture panels according to claim 1, characterized in that, Both ends of the central rotating shaft (1) are splined parts, and the outer surface of each splined part is formed with a ring of outwardly protruding spline teeth (6). The inner ring of each transmission ring (2) is provided with a spline groove (7) that mates with the spline teeth (6).

4. A roller coating device for curved and irregularly shaped furniture panels according to claim 1, characterized in that, Both ends of the central rotating shaft (1) are provided with a support platform (8). The axial driving component is a linear motor (9) fixed on the top of the support platform (8). The output direction of the linear motor (9) is parallel to the axial direction of the central rotating shaft (1), and the output end of the linear motor (9) is connected to the corresponding transmission ring (2) through a rotational decoupling mechanism.

5. A roller coating device for curved and irregularly shaped furniture panels according to claim 4, characterized in that, The rotary decoupling mechanism includes a plane bearing (10) and a connecting rod (11). Each transmission ring (2) has an annular mounting groove (12) extending inward at one end facing the linear motor (9). The plane bearing (10) is located in the annular mounting groove (12). Each transmission ring (2) has a limiting ring (13) fixedly provided at one end facing the linear motor (9). The inner ring of the limiting ring (13) extends toward the opening of the annular mounting groove (12). The connecting rod (11) connects the plane bearing seat to the output end of the linear motor (9).

6. A roller coating device for curved and irregularly shaped furniture panels according to claim 4, characterized in that, Each support platform (8) is fixedly provided with a bracket (14) at its top. The bracket (14) is fixedly provided with a first bearing seat (15). Each spline part of the central rotating shaft (1) is coaxially formed with an outwardly extending insertion part (16) connected to the first bearing seat (15).

7. A roller coating device for curved and irregularly shaped furniture panels according to claim 6, characterized in that, The paint supply mechanism includes a paint-spreading roller (17) and a paint scraper (18). The paint-spreading roller (17) is arranged parallel to the flexible hollow roller (3). The paint-spreading roller (17) is located obliquely above the flexible hollow roller (3), and the paint-spreading roller (17) presses down the bulging coating area (4). The paint scraper (18) is located on the side of the paint-spreading roller (17). The paint scraper (18) extends along the axial direction of the paint-spreading roller (17), and the paint scraper (18) is inclined downward, with its cutting edge in contact with the outer peripheral wall of the paint-spreading roller (17).

8. A roller coating apparatus for curved and irregularly shaped furniture panels according to claim 7, characterized in that, The bracket (14) is also fixedly provided with a second shaft seat (19), and the two ends of the paint roller (17) are respectively connected to the second shaft seat (19).

9. A roller coating device for curved and irregularly shaped furniture panels according to claim 7, characterized in that, The paint scraper (18) has a paint baffle frame fixedly provided on the outer side of its blade edge, which is perpendicular to its surface. The paint baffle frame includes an axial baffle (20) and two lateral baffles (21). The axial baffle (20) extends along the axial direction of the paint-spreading roller (17). The two lateral baffles (21) are symmetrically connected to the two ends of the axial baffle (20). One end of each lateral baffle (21) is formed with an arc-shaped surface (22) that fits against the outer surface of the paint-spreading roller (17). Each support platform (8) is fixedly provided with a support frame (23) on its top. The two ends of the paint baffle frame are fixedly connected to the two support frames (23) respectively.

10. A roller coating process for curved and irregularly shaped furniture panels, employing a roller coating apparatus for curved and irregularly shaped furniture panels as described in any one of claims 1 to 9, characterized in that, The roller coating process includes the following steps: S1. Use visual inspection equipment to obtain the width parameters of the board to be coated, and identify the surface morphology and groove information of the board. S2. Based on the width of the plate, control the axial drive to drive the two transmission rings (2) to move towards each other, so as to compress the flexible hollow roller (3) and make the middle part of the flexible hollow roller (3) radially expand, and finally form a bulging coating area (4) with a width greater than that of the plate. S3, drive the central rotating shaft (1) to drive the flexible hollow roller (3) to rotate, and supply paint to the bulging coating area (4) through the paint supply mechanism; S4. Place the plate on the multi-degree-of-freedom conveying platform and control the plate to pass under the flexible hollow roller (3) along the conveying path. During the conveying process, according to the slot position information identified in step S1, control the multi-degree-of-freedom conveying platform to dynamically adjust the conveying posture of the plate and change the relative angle between the plate and the flexible hollow roller (3). S5. By utilizing the interference contact and flexible deformation between the bulging coating area (4) of the flexible hollow roller (3) and the surface of the board, and in conjunction with the posture adjustment of the board, multi-angle collaborative roller coating is performed on the surface curves and side grooves of the board.

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