A flexible facing sheet finishing production line and finishing method

Abstract

The present application relates to the technical field of flexible sheet processing, in particular to a flexible finishing sheet finishing production line and finishing method, which are integrated with pretreatment polishing, twice spraying and twice drying, automatic turning, back net cutting, gluing, pasting, visual back net correction, back net drying, trimming and polishing, automatic stacking and discharging full processes in sequence, realize unmanned continuous operation, greatly improve production efficiency and reduce labor cost. The flexible sheet pretreatment device adopts a self-adaptive floating polishing structure, and the polishing roller can vertically float adaptively with the thickness of the sheet; the back net pasting device realizes automatic unwinding, clamping traction, accurate cutting, uniform gluing and automatic pasting of the back net, and the back net conveying speed is synchronized with the sheet conveying speed, and the pasting precision is high; the back net correction device relies on a visual comparison mechanism to identify misalignment deviation in real time, cooperates with a reciprocating adjustment platform and an adjustable cylinder which can swing adaptively, realizes multi-angle accurate correction of the back net, and completely solves the problem of back net deviation and skew.

Description

Technical Field

[0001] This invention relates to the field of flexible sheet technology, specifically to a production line and method for refining flexible decorative sheets. Background Technology

[0002] Flexible decorative sheets, such as flexible sheets and flexible stone, are a new type of building decoration material. They are lightweight, flexible, environmentally friendly, and easy to install, and are widely used in interior and exterior wall decoration. There are two main production methods for flexible decorative sheets: powder hot-press drying molding and slurry ring die molding. Slurry ring die molding, due to the use of a ring die, is prone to air bubbles during the molding process, resulting in poor overall density and relatively lower product quality; however, it has high production efficiency and low equipment cost. Powder hot-press drying molding requires hot pressing, leading to more equipment and higher overall equipment cost; however, the resulting flexible sheets are relatively dense and of high quality. The production process of powder hot-press drying molding typically includes slurry preparation, material distribution, molding, and curing. However, the initial sheets coming out of the molding equipment often have problems such as insufficient surface flatness, the need for a protective or decorative layer, and the need to attach a backing mesh to the back to enhance strength, making subsequent finishing processes numerous and complex.

[0003] Traditional production methods mostly employ stand-alone operations or semi-automatic assembly lines, such as manual labor or simple machinery for painting, drying, flipping, mesh laying, and trimming. This approach has the following problems: First, it has a low level of automation, heavily relies on manual labor, resulting in low production efficiency and high labor costs; second, manual operation leads to poor quality consistency, especially in the easy misalignment of the backing mesh, causing product scrap or requiring extensive rework; third, the processes of painting, drying, and trimming are not smoothly connected, resulting in long work-in-process turnover times and making the surface prone to scratches or contamination. Therefore, developing an integrated, highly automated, and high-precision flexible decorative sheet finishing production line is of great significance for improving product quality and production efficiency. Summary of the Invention

[0004] In order to overcome one of the shortcomings of the prior art, the purpose of this invention is to provide a production line and method for refining flexible decorative sheets, which realizes fully automated production of flexible sheets and significantly improves production efficiency and product yield.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A flexible decorative sheet finishing production line, including

[0007] A flexible sheet pretreatment device that can polish the surface of flexible sheets;

[0008] A painting device capable of spraying a finishing paint onto the flexible sheet output by the flexible sheet pretreatment device.

[0009] A topcoat drying device that can dry the flexible sheet output by the spray painting device;

[0010] A flipping device that can receive and flip the flexible sheet output by the paint drying device;

[0011] The backing mesh attaching device is capable of receiving the flexible sheet output by the flipping device and attaching the backing mesh to the flexible sheet.

[0012] A back netting correction device is capable of receiving the flexible sheet with a back netting output by the back netting device and moving the back netting relative to the flexible sheet to correct the relative position of the back netting and the flexible sheet.

[0013] A back-web drying device, which can receive and dry the flexible sheet material after it has been corrected by the back-web straightening device;

[0014] The edge trimming and polishing device is capable of trimming and polishing the four sides of the flexible sheet output by the back mesh drying device.

[0015] A stacking and unloading device is used to unload the dried flexible sheets from the trimming and polishing device one by one and stack them into a stack.

[0016] Furthermore, the backing mesh attaching device includes a frame, a flexible sheet conveying mechanism, a backing mesh unwinding mechanism, a backing mesh cutting mechanism, and a backing mesh conveying mechanism. All of these mechanisms are mounted on the frame. The backing mesh conveying mechanism is positioned above the flexible sheet conveying mechanism. The backing mesh unwinding mechanism conveys the backing mesh to the backing mesh conveying mechanism. The backing mesh cutting mechanism is located on the frame in the area between the backing mesh unwinding mechanism and the backing mesh conveying mechanism. A gluing mechanism is provided on the frame at the output end of the backing mesh conveying mechanism. This gluing mechanism applies adhesive to the backing mesh conveyed by the backing mesh conveying mechanism. The backing mesh, after being coated with adhesive and output by the gluing mechanism, can be attached to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism.

[0017] Furthermore, the adhesive coating mechanism includes a receiving guide plate, a support frame, and an adhesive receiving trough. The support frame is mounted on the machine frame, and both the adhesive receiving trough and the receiving guide plate are disposed on the support frame. The adhesive receiving trough is located at the lower end of the receiving guide plate, and the upper end of the receiving guide plate can receive the back net output by the back net conveying mechanism. An adhesive coating roller is rotatably mounted in the adhesive receiving trough, and a pressure roller that cooperates with the adhesive coating roller is rotatably mounted on the support frame. The pressure roller and the adhesive coating roller cooperate to clamp and convey the back net. A driver connected to one end of the adhesive coating roller is provided on the machine frame. The back side of the flexible sheet conveyed by the flexible sheet conveying mechanism can receive the back net clamped by the cooperation of the pressure roller and the adhesive coating roller.

[0018] Furthermore, the back netting cutting mechanism includes a slide mounted on the frame, a cross arm disposed on the sliding end of the slide, a pair of opening and closing clamping blocks disposed on the cross arm, and a cutting assembly disposed on the frame. The cutting assembly is disposed on the end of the slide near the back netting unwinding mechanism. A pair of guide pinch rollers are rotatably disposed on the frame between the cutting assembly and the back netting unwinding mechanism. An opening and closing cylinder for controlling the opening and closing of the pair of opening and closing clamping blocks is disposed on the cross arm. A pair of receiving pinch rollers are disposed on the end of the frame near the back netting conveying mechanism. Each receiving pinch roller has a mutually cooperating pinching protrusion on its outer periphery. Each of the pair of opening and closing clamping blocks has a notch adapted to the pinching protrusion on its corresponding side.

[0019] Furthermore, the flipping device includes a support, an infeed conveying mechanism and an outfeed conveying mechanism mounted on the support. The infeed conveying mechanism is positioned above the outfeed conveying mechanism and has the opposite conveying direction. The infeed conveying mechanism can receive the flexible sheet material output by the topcoat drying device. The outfeed end of the outfeed conveying mechanism is connected to the infeed end of the backing mesh device. An arc-shaped guide frame is provided in the area between the outfeed end and the infeed end of the infeed conveying mechanism on the support. Several guide rollers are provided on the arc-shaped guide frame. An arc-shaped guide plate is provided on the outside of the arc-shaped guide frame on the support. The lower end of the arc-shaped guide plate is connected to the infeed end of the outfeed conveying mechanism. A flipping guide channel is formed between all the guide rollers and the arc-shaped guide plate. The lower end of the flipping guide channel is connected to the infeed end of the outfeed conveying mechanism.

[0020] Furthermore, the back netting straightening device includes a frame, a straightening conveying mechanism, a roller straightening frame, an adjusting cylinder, and a visual comparison mechanism. Both the straightening conveying mechanism and the visual comparison mechanism are mounted on the frame. The two ends of the straightening conveying mechanism are respectively connected to the back netting application device and the back netting drying device. A reciprocating adjusting platform is slidably mounted on the area above the straightening conveying mechanism on the frame. The roller straightening frame is rotatably mounted on the reciprocating adjusting platform. A straightening motor for driving the roller straightening frame to rotate is provided on the reciprocating adjusting platform. The visual comparison mechanism is electrically connected to the straightening motor. The roller straightening frame... Both ends of the adjusting cylinder are provided with sliding grooves, and sliding blocks are slidably installed in each sliding groove. A return spring connected to the sliding block is provided in each sliding groove. Each sliding block is rotatably mounted with a mounting block via a rotating shaft. A torsion spring for resetting the mounting block relative to the sliding block is fitted on the rotating shaft. Both ends of the adjusting cylinder are rotatably mounted on two mounting blocks respectively. When the straightening motor drives the roller straightening frame to rotate, each mounting block can automatically adjust its swing angle relative to the sliding block according to the force borne by the adjusting cylinder when it contacts the back net, so as to match the height of the rotation center of the corresponding end of the adjusting cylinder.

[0021] Furthermore, a balance bar is hinged to one end of each of the two mounting blocks. A connecting cylinder is provided at the outward end of one balance bar, and an insert that can only rotate is provided at the outward end of the other balance bar. The insert can be screwed into the connecting cylinder.

[0022] Furthermore, the flexible sheet pretreatment device includes a mounting frame, a feeding conveyor line, a feeding robot, a finishing sanding frame, and sanding rollers. The feeding conveyor line is mounted on the mounting frame. The feeding robot is located on one side of the feeding conveyor line and is used to feed blanks onto the feeding conveyor line. Sanding tracks are provided on both sides of the mounting frame located on the feeding conveyor line. The finishing sanding frame is spanned above the feeding conveyor line, and its two ends are slidably mounted on the corresponding sanding tracks. A reciprocating direct drive is provided on the mounting frame to drive the finishing sanding frame to slide back and forth. Mounting seats are provided on both ends of the finishing sanding frame, and the lower end of the mounting seat has an inverted U-shaped groove. Shafts are fitted on both ends of the sanding rollers. The two bushings have axially oriented guide grooves on their inner walls. The grinding roller has key blocks at both ends that mate with the guide grooves. A sliding block is vertically slidably installed in each inverted U-shaped groove. Both bushings are rotatably mounted on the sliding blocks. The bottom of each inverted U-shaped groove is connected to the sliding block via an elastic element. The grinding roller has outward-pointing truncated cones at both ends. The finishing grinding frame has repositionable sliding seats slidably installed on opposite sides of the two mounting bases. The downward-facing end of each sliding seat has an inverted V-shaped groove, and the inner wall of each inverted V-shaped groove abuts against the outer wall of the corresponding truncated cone. The finishing grinding frame is equipped with a grinding motor that is drivenly connected to one end of the grinding roller.

[0023] A method for finishing flexible decorative sheets includes the following steps:

[0024] S100: The surface of the flexible sheet is polished using a flexible sheet pretreatment device, and the polished flexible sheet is then dusted.

[0025] S200: The dust-removed flexible sheet is fed into the spray painting device for a first spray of topcoat, and then into the topcoat drying device for a first drying; after the first drying is completed, it is then passed through the spray painting device and the topcoat drying device for a second spray of topcoat and a second drying.

[0026] S300: After the flexible sheet has been dried for the second time, the flexible sheet is turned over using a turning device;

[0027] S400: The flexible sheet conveying mechanism receives the flexible sheet output by the flipping device. The back net unwinding mechanism, together with the back net cutting mechanism, cuts the strip back net into segments. The back net conveying mechanism conveys each segment of back net to the gluing mechanism for back-side gluing and adjusts the back net conveying direction. The output end of the gluing mechanism enables the back net to contact and adhere to the back side of the flexible sheet conveyed by the flexible sheet conveying mechanism.

[0028] S500: After the straightening conveyor receives and positions the flexible sheet output by the flexible sheet conveyor, the visual comparison mechanism captures and identifies the flexible sheet on the straightening conveyor and the back net on its back. The straightening motor and the reciprocating adjustment platform can adjust the rotation angle of the roller straightening frame and the sliding amount of the reciprocating adjustment platform according to the degree and situation of misalignment between the outline of the flexible sheet and the outline of the back net output by the visual comparison mechanism, so that the adjustment cylinder drives the back net to twist relative to the flexible sheet. The above operation is repeated multiple times until the outline of the back net and the outline of the flexible sheet are completely superimposed or the degree of superposition meets the preset value.

[0029] S600: After the flexible sheet and the back net on its back side are straightened, the back net drying device receives and dries the flexible sheet output by the straightening conveying mechanism.

[0030] S700: After the flexible sheet and its back mesh are dried, they are sent to the trimming and grinding device for trimming and grinding in sequence to obtain the finished product. The stacking and unloading device unloads the finished product one by one and stacks them into a stack.

[0031] Furthermore, step S400 specifically includes the following steps:

[0032] S410: The flexible sheet conveying mechanism receives the flexible sheet output by the flipping device, and the guide plates on both sides of the flexible sheet conveying mechanism position the flexible sheet.

[0033] S420: The back net unwinding mechanism and guide pinch rollers are started. The back net unwinding mechanism unwinds the back net belt, and the guide pinch rollers pinch the back net belt. The slide block drives the cross arm to approach the guide pinch rollers. After reaching the clamping position, the opening and closing cylinder drives a pair of opening and closing clamping blocks to clamp the ends of the back net belt output by the pair of guide pinch rollers. The slide block drives the pair of opening and closing clamping blocks and the clamped back net belt to move together toward the feed end of the back net conveying mechanism.

[0034] S430: After the notches on the pair of opening and closing clamping blocks are engaged with the clamping protrusions on the pair of receiving clamping rollers, the cutting assembly cuts the back netting into a single back netting sheet; then the pair of receiving clamping rollers and the back netting conveying mechanism start synchronously, and at the same time the opening and closing cylinder controls the pair of opening and closing clamping blocks to release the back netting; the pair of receiving clamping rollers clamp the cut back netting, and the back netting conveying mechanism receives the back netting output by the pair of receiving clamping rollers; the slide moves the pair of opening and closing clamping blocks to reset;

[0035] S440: After the end of the back net is output from the back net conveying mechanism, the end of the back net is conveyed along the guiding direction of the receiving guide plate due to its own weight or the guiding structure, and is finally clamped by the glue coating roller and the pressure roller; when the glue coating roller and the pressure roller clamp the back net, glue can be applied to the back net simultaneously.

[0036] S450: The back netting, which is clamped by the coating roller and the pressure roller, adheres to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism due to its own weight.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] The flexible decorative sheet fine processing production line of the present invention adopts an assembly line layout, which integrates the entire process of pretreatment and polishing, two spraying and two drying, automatic flipping, back net cutting, glue application and bonding, visual back net correction, back net drying, edge trimming and polishing, and automatic stacking and unloading in sequence, realizing unmanned continuous operation, greatly improving production efficiency and reducing labor costs. The flexible sheet pretreatment device adopts an adaptive floating grinding structure. The grinding roller can adaptively float vertically according to the sheet thickness. The cone and inverted V-groove cooperate to achieve automatic self-alignment, ensuring uniform grinding of the surface without missed grinding or over-grinding. The back netting device realizes automatic unwinding, clamping and traction, precise cutting, uniform glue application, and automatic bonding of the back netting. The back netting conveying speed is synchronized with the sheet conveying speed, and the bonding accuracy is high. The back netting correction device relies on a visual comparison mechanism to identify misalignment deviations in real time. With the help of a reciprocating adjustment platform and an adaptive swinging adjustment cylinder, it achieves precise correction of the back netting from multiple angles, completely solving the problem of back netting offset and skew. The flipping device adopts an arc-shaped guide channel for non-damaging flexible flipping, avoiding sheet wrinkling and tearing. The entire production line is equipped with a dedicated precision processing method. The process steps are reasonably connected and the parameters are controllable. Two sprayings and two dryings improve the flatness and adhesion of the surface paint, significantly improving the yield of finished products. It is suitable for the large-scale processing and production of flexible surface sheets of various specifications.

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the flexible sheet pretreatment device in an embodiment of the present invention;

[0042] Figure 3 This is a cross-sectional view of a portion of the flexible sheet pretreatment device in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the structure of the grinding roller and the surface grinding frame in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the flipping device in an embodiment of the present invention;

[0045] Figure 6 This is a schematic diagram of the back mesh attaching device in an embodiment of the present invention;

[0046] Figure 7This is a cross-sectional view of a portion of the structure of the backing mesh attaching device in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the back mesh correction device in an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the structure of the adjusting cylinder and the roller straightening frame in an embodiment of the present invention.

[0049] Explanation of icon numbers:

[0050] Flexible sheet pretreatment device 100, mounting frame 110, reciprocating direct drive 111, feeding conveyor line 120, feeding robot 130, grinding track 140, finishing grinding frame 150, grinding motor 151, grinding roller 160, bushing 161, guide groove 162, mounting base 170, inverted U-shaped groove 171, sliding block 172, elastic element 173, sliding seat 180, inverted V-shaped groove 190, truncated cone 163, key block 164;

[0051] 200 spray painting equipment;

[0052] 300 topcoat drying unit;

[0053] Flipping device 400, bracket 410, feeding conveyor mechanism 420, discharging conveyor mechanism 430, arc-shaped guide frame 440, guide roller 450, arc-shaped guide plate 460, flipping guide channel 470;

[0054] Backing netting device 500, frame 510, flexible sheet conveying mechanism 520, backing netting unwinding mechanism 530, backing netting cutting mechanism 540, slide 541, cross arm 542, opening and closing clamping block 543, cutting assembly 544, guide clamping roller 545, opening and closing cylinder 546, receiving clamping roller 547, clamping convex ring 548, notch 549, backing netting conveying mechanism 550, gluing mechanism 560, receiving guide plate 561, support frame 562, gluing groove 563, gluing roller 564, pressure roller 565, limiting guide roller 566, drive roller 567, driver 570;

[0055] The back net straightening device 600, frame 610, straightening conveying mechanism 620, roller straightening frame 630, sliding groove 631, sliding block 632, return spring 633, rotating shaft 634, mounting block 635, torsion spring 636, balance bar 637, connecting cylinder 638, adjusting cylinder 640, visual comparison mechanism 650, reciprocating adjustment platform 660, and straightening motor 670;

[0056] 700-ton back-mesh drying unit;

[0057] 800 trimming and polishing device;

[0058] 900 palletizing and unloading device. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0060] See Figures 1 to 9 This application provides a production line for the fine processing of flexible decorative sheets, including a flexible sheet pretreatment device 100, a painting device 200, a topcoat drying device 300, a flipping device 400, a backing mesh attaching device 500, a backing mesh straightening device 600, a backing mesh drying device 700, an edge trimming and sanding device 800, and a stacking and unloading device 900; the flexible sheet pretreatment device 100 can sand the decorative surface of the flexible sheet; the painting device 200 can spray a topcoat onto the decorative surface of the flexible sheet output from the flexible sheet pretreatment device 100; the topcoat drying device 300 can dry the flexible sheet output from the painting device 200; and the flipping device 400 can receive and flip the flexible sheet output from the topcoat drying device 300. The system comprises: a flexible sheet material; a backing mesh attaching device 500 that receives the flexible sheet material output by the flipping device 400 and attaches a backing mesh to it; a backing mesh straightening device 600 that receives the flexible sheet material with a backing mesh attached by the backing mesh attaching device 500 and moves the backing mesh relative to the flexible sheet material to correct their relative positions; a backing mesh drying device 700 that receives and dries the flexible sheet material corrected by the backing mesh straightening device 600; an edge trimming and polishing device 800 that trims and polishes the four sides of the flexible sheet material output by the backing mesh drying device 700; and a stacking and unloading device 900 that unloads the dried flexible sheet material from the edge trimming and polishing device 800 one sheet at a time and stacks them into a stack. These devices are connected sequentially to form a complete automated production line. Material transfer between the devices can be achieved through belt conveyors, roller conveyors, or robotic arms, etc., and this application does not impose strict limitations on these methods.

[0061] Specifically, the entire production line is arranged in a straight line according to the process flow, with each device seamlessly connected by a conveyor mechanism. This enables fully automated assembly line operations for flexible sheet materials, from blank material feeding, surface sanding, double painting and drying, automatic flipping, back mesh cutting, adhesive bonding, visual precision correction, back mesh drying, four-sided edge trimming and sanding, to automatic stacking and unloading. Each station operates independently with matched cycle times, adaptable to the processing of flexible decorative sheets of different widths and thicknesses, offering strong versatility and stable operation.

[0062] See Figures 2 to 4The flexible sheet pretreatment device 100 is used to polish the surface of the formed flexible sheet to increase its surface roughness and improve the adhesion of the subsequent paint layer; the surface is the decorative surface of the flexible sheet in this application. In a specific embodiment of this application, the flexible sheet pretreatment device 100 includes a mounting frame 110, a feeding conveyor line 120, a feeding robot 130, a surface polishing frame 150, and a polishing roller 160. The feeding conveyor line 120 is mounted on the mounting frame 110 and is used to convey the sheet to be processed. The feeding robot 130 is located on one side of the feeding conveyor line 120 and is used to automatically grab the blank and place it on the feeding conveyor line 120 to achieve automatic feeding. The mounting frame 110 is equipped with polishing tracks 140 on both sides of the feeding conveyor line 120. The surface polishing frame 150 is spanned above the feeding conveyor line 120, with its two ends slidably mounted on the corresponding polishing tracks 140. The mounting frame 110 is equipped with a reciprocating direct drive 111 for driving the surface polishing frame 150 to slide back and forth. The reciprocating direct drive 111 can be a lead screw mechanism driven by a servo motor or a conventional electric slide structure. In this way, the surface polishing frame 150 can move back and forth along the width direction of the sheet, and in conjunction with the conveying action of the feeding conveyor line 120, a zigzag or reciprocating polishing path is formed on the surface of the flexible sheet. This is particularly suitable for fine processing of the surface of flexible decorative sheets, such as eliminating local protrusions caused by previous processes, or creating a uniform and delicate brushed texture.

[0063] See Figure 3 and Figure 4To enable the grinding roller 160 to adapt to minor unevenness or thickness fluctuations on the sheet surface and maintain constant grinding pressure, this application employs a floating mounting structure. Specifically, each end of the surface grinding frame 150 is provided with a mounting base 170, and the lower end of the mounting base 170 is provided with an inverted U-shaped groove 171. Both ends of the grinding roller 160 are fitted with bushings 161, and the inner walls of both bushings 161 are provided with axially oriented guide grooves 162. Both ends of the grinding roller 160 are provided with key blocks that mate with the guide grooves 162, allowing the grinding roller 160 to slide axially relative to the bushings 161 to transmit torque. Each of the inverted U-shaped grooves 171 has a vertically slidable sliding block 172. Both bushings 161 are rotatably mounted on the sliding block 172. The bottom of each inverted U-shaped groove 171 is connected to the sliding block 172 via an elastic element 173, providing downward pre-pressure to the grinding roller 160. Both ends of the grinding roller 160 are provided with outward-pointing truncated cones 163. Both ends of the finishing grinding frame 150 are slidably mounted on opposite sides of the two mounting seats 170 with repositionable sliding seats 180. The downward-facing end of each sliding seat 180 has an inverted V-shaped groove 190, the inner wall of which abuts against the outer wall of the corresponding truncated cone 163. When the grinding roller 160 rotates, the truncated cone 163 moves relative to the inverted V-shaped groove 190, pushing the sliding seat 180 outward due to the action of the conical surface. Meanwhile, the sliding seat 180 can be reset by a reset mechanism, which can be a spring or other actively driven structure. Under the action of the reset mechanism, the sliding seat 180 will continuously apply inward force, thereby forcing the grinding roller 160 to maintain a centered self-centering force in the axial direction, preventing it from shifting, and continuously constraining the grinding roller 160 to the center, achieving rotational self-centering. The surface polishing frame 150 is equipped with a polishing motor 151 that is drivenly connected to one end of the grinding roller 160. This structure allows the grinding roller 160 to float in the vertical direction and self-center in the axial direction, resulting in a more uniform polishing effect.

[0064] In the above embodiments, the elastic element 173 can be a spring structure. During operation, the loading robot 130 automatically places the blank on the loading conveyor line 120, and the loading conveyor line 120 drives the blank to move at a constant speed. The reciprocating direct drive drives the surface polishing frame 150 to move laterally back and forth along the polishing track 140, and the polishing motor 151 drives the polishing roller 160 to rotate at high speed for surface polishing. The elastic element 173 pushes the sliding block 172 downward, so that the polishing roller 160 always flexibly fits the surface of the sheet, which can adapt to slight changes in the thickness of the sheet. The cone 163 abuts against the inclined surface of the inverted V-groove 190 to realize the automatic centering of the polishing roller 160 and avoid left and right deviation. It is especially suitable for the lateral movement of the polishing roller 160 and avoids the end face of the polishing roller 160 from scratching the flexible sheet. When the polishing roller 160 moves laterally, especially when encountering raised areas, the end of its lateral movement will inevitably adjust the height of its rotation center at that end through the inverted V-groove 190 due to the force applied. Simultaneously, the sliding block 172 slides within the inverted U-groove 171 to match the height of the rotation center at that end of the polishing roller 160, and the sliding seat 180 slides relative to the surface polishing frame 150 to match the height of the rotation center at that end of the polishing roller 160. In the above embodiment, the bushing 161 serves to reduce wear between the polishing roller 160 and the sliding block 172. The sliding block 172 and the bushing 161 can only rotate relative to each other; the bushing 161 cannot move axially relative to the sliding block 172. The key block and guide groove 162 cooperate to ensure that the polishing roller 160 rotates synchronously with the bushing 161, preventing slippage and free rotation, significantly improving polishing uniformity, and also accommodating the lateral axial movement of the polishing roller 160 relative to the bushing 161. The polished flexible sheet usually contains dust. Therefore, in practical applications, a dust removal device, such as a negative pressure dust suction hood or a brush roller, can be installed after the pretreatment device to clean the surface of the flexible sheet.

[0065] See Figure 1 The painting device 200 is used to spray a finishing paint onto the sanded flexible sheet. The painting device 200 can be a conventional reciprocating spray painting machine or a robotic spray painting station, and includes spray guns, a paint circulation system, etc. The topcoat drying device 300 is used to quickly dry the sprayed paint layer; it can be a hot air circulating drying box or an infrared drying tunnel oven. To achieve a better paint finish, in the finishing method of this application, the sheet passes through the painting device 200 and the topcoat drying device 300 twice, achieving secondary painting and secondary drying to ensure paint film thickness and adhesion.

[0066] See Figure 1 and Figure 5The flexible sheet with the dried topcoat needs to have a backing mesh attached to its back side, therefore it needs to be flipped by a flipping device 400. In one embodiment of this application, the flipping device 400 includes a support 410, a feeding conveying mechanism 420 disposed on the support 410, and a discharging conveying mechanism 430. The feeding conveying mechanism 420 is disposed above the discharging conveying mechanism 430 and the conveying directions are opposite (for example, the feeding conveying mechanism 420 conveys to the right, and the discharging conveying mechanism 430 conveys to the left). The feeding conveying mechanism 420 receives the flexible sheet output by the topcoat drying device 300, and the discharging end of the discharging conveying mechanism 430 is connected to the feeding end of the backing mesh attaching device 500. An arc-shaped guide frame 440 is provided in the area between the discharge end of the feeding conveying mechanism 420 and the feed end of the discharge conveying mechanism 430 on the support 410. Several guide rollers 450 are provided on the arc-shaped guide frame 440. An arc-shaped guide plate 460 is provided on the outer side of the arc-shaped guide frame 440 on the support 410. A flipping guide channel 470 with a width slightly greater than the sheet thickness is formed between all the guide rollers 450 and the arc-shaped guide plate 460. The upper end of the flipping guide channel 470 is connected to the discharge end of the feeding conveying mechanism 420, and the lower end is connected to the feed end of the discharge conveying mechanism 430. During operation, after the flexible sheet is output from the feeding conveyor 420, its front end enters the flipping guide channel 470. Under the thrust of the feeding conveyor 420 and its own gravity, it smoothly slides down the arc-shaped flipping guide channel 470, completing a 180-degree flip during this process. Finally, it lands on the discharge conveyor 430 with its back facing up and is transported to the next station. The entire process involves no rigid clamping, no squeezing or pulling, ensuring the flexible sheet is flat and wrinkle-free, with a regular flipping posture, providing a precise posture foundation for subsequent backing mesh application.

[0067] See Figure 1 , Figure 6 and Figure 7After being flipped, the sheet material enters the backing mesh attaching device 500 for the backing mesh attaching process. The backing mesh attaching device 500 includes a frame 510, a flexible sheet conveying mechanism 520, a backing mesh unwinding mechanism 530, a backing mesh cutting mechanism 540, and a backing mesh conveying mechanism 550. The flexible sheet conveying mechanism 520, the backing mesh unwinding mechanism 530, the backing mesh cutting mechanism 540, and the backing mesh conveying mechanism 550 are all mounted on the frame 510. The backing mesh conveying mechanism 550 is positioned above the flexible sheet conveying mechanism 520, and the backing mesh unwinding mechanism 530 is used to convey material to the backing mesh conveying mechanism 550. The back netting is provided with a back netting cutting mechanism 540 located on the frame 510 in the area between the back netting unwinding mechanism 530 and the back netting conveying mechanism 550. The frame 510 is provided with an adhesive coating mechanism 560 at the output end of the back netting conveying mechanism 550. The adhesive coating mechanism 560 can coat the back netting conveyed by the back netting conveying mechanism 550 with adhesive. The back netting coated with adhesive by the adhesive coating mechanism 560 and output can be attached to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism 520.

[0068] The backing mesh application device 500 adopts a two-tiered layout. The lower tier is the flexible sheet conveying mechanism 520, which transports the sheet material. The upper tier completes the backing mesh unwinding, traction cutting, and adhesive application. The process layout is compact and reasonable, with the backing mesh and sheet conveying speeds synchronized to ensure wrinkle-free and offset-free bonding. Both the flexible sheet conveying mechanism 520 and the backing mesh conveying mechanism 550 can use flat belt conveyors. The backing mesh unwinding mechanism 530 can be a conventional unwinding structure or a structure composed of a motor, air shaft, and magnetic powder brake to control the unwinding tension. It should be noted that after the backing mesh is output from the adhesive application mechanism 560, it travels synchronously with the flexible sheet conveyed by the flexible sheet conveying mechanism 520. This ensures that each backing mesh can be bonded to each flexible sheet as closely as possible, guaranteeing bonding overlap and reducing the number of adjustments required later.

[0069] The structure of the adhesive application mechanism 560 is shown below. Figure 7The system includes a receiving guide plate 561, a support frame 562, and a glue-receiving trough 563. The support frame 562 is mounted on the machine frame 510, and both the glue-receiving trough 563 and the receiving guide plate 561 are mounted on the support frame 562. The glue-receiving trough 563 is located at the lower end of the receiving guide plate 561, and the upper end of the receiving guide plate 561 receives the back net output by the back net conveying mechanism 550. Its guiding surface is a smooth arc surface, allowing the back net to smoothly turn downwards. A glue-applying roller 564 is rotatably mounted inside the glue-receiving trough 563, with its lower half immersed in glue. A pressure roller 565, which cooperates with the glue-applying roller 564, is rotatably mounted on the support frame 562. The gap between the pressure roller 565 and the glue-applying roller 564 is slightly smaller than the thickness of the back net to clamp the back net and control the glue amount. A driver 570 connected to one end of the glue-applying roller 564 is provided on the machine frame 510. When the back net passes between the glue coating roller 564 and the pressure roller 565, it is evenly coated with glue and then output from below them at an angle, landing precisely on the back of the sheet on the flexible sheet conveying mechanism 520.

[0070] The driver 570 can be a servo motor for easy control of the clamping speed. The coating roller 564 is made of elastic rubber with fine grooves on its outer circumference to absorb glue and achieve uniform coating. A pressure roller 565, which cooperates with the coating roller 564, is rotatably mounted on the support frame 562 via bearing seats. The pressure roller 565 is a hard metal roller, which is selected according to actual needs. In some embodiments, to better restrict the back net on the receiving guide plate 561, a limiting guide roller 566 is provided on the support frame 562. The limiting guide roller 566 is an elastic rubber roller with its axis parallel to the surface of the receiving guide plate 561. The limiting guide roller 566 can cooperate with the receiving guide plate 561 to clamp the back net, limit the conveying direction of the back net, prevent the back net from deviating when conveyed on the receiving guide plate 561, and ensure that the back net can accurately enter the clamping gap between the coating roller 564 and the pressure roller 565. Furthermore, an active roller 567, which cooperates with the limiting guide roller 566, is rotatably mounted on the support frame 562 via a bearing seat. The active roller 567 is connected to the glue-applying roller 564 via a gear set, achieving synchronous rotation with the glue-applying roller 564. The receiving guide plate 561 has a hollow hole for avoiding the active roller 567. The upper part of the active roller 567 extends out of the hollow hole and cooperates with the limiting guide roller 566, forming a clamping structure to provide auxiliary power for the conveying of the back net, ensuring the smooth conveying of the back net and preventing the back net from sagging or wrinkling due to its own weight.

[0071] See Figure 7In actual production, the backing mesh is made of fiberglass mesh, adhesive, and reinforcing materials bonded together. Although it maintains a certain rigidity, its overall deflection exceeds its rigidity. Furthermore, its surface is uneven and its edges are warped. If only simple clamping rollers are used for feeding, errors can easily occur, affecting the subsequent bonding quality. Therefore, in one embodiment of this application, see... Figure 6 The back netting cutting mechanism 540 includes a slide 541 mounted on a frame 510, a cross arm 542 disposed on the sliding end of the slide 541, a pair of opening and closing clamping blocks 543 disposed on the cross arm 542, and a cutting assembly 544 disposed on the frame 510. The cutting assembly 544 is disposed on one end of the slide 541 near the back netting unwinding mechanism 530. A pair of guide pinch rollers 545 are rotatably disposed on the frame 510 between the cutting assembly 544 and the back netting unwinding mechanism 530 for continuously conveying the back netting belt. An opening and closing cylinder 546 is disposed on the cross arm 542 to control the opening and closing of the pair of opening and closing clamping blocks 543. A pair of receiving pinch rollers 547 are disposed on one end of the frame 510 near the back netting conveying mechanism 550, and each receiving pinch roller 547 has a cooperating pinching protrusion 548 disposed on its outer periphery. Each pair of opening and closing clamping blocks 543 has a notch 549 on one side that matches the clamping protrusion 548. During operation, the slide 541 moves the closed opening and closing clamping blocks 543 to the guide clamping roller 545, clamping the end of the back mesh belt. Then, the slide 541 retracts, pulling the back mesh belt to a predetermined length. At this point, the notch 549 engages with the clamping protrusion 548, positioning the back mesh belt. The cutting assembly 544 then cuts the back mesh. The receiving clamping roller 547 clamps the cut back mesh and conveys it forward to the back mesh conveying mechanism 550. The entire process achieves precise length setting and rapid transfer. During the resetting process of the slide 541, the released opening and closing clamping blocks 543 also serve to support the back mesh.

[0072] In the above embodiments, the slide 541 can be a rodless cylinder or an electric slide, and the cutting component 544 can be a pneumatic scissors or a cutting blade that can be raised and lowered. These are all conventional technical means, and will not be described in detail here.

[0073] See Figure 1 and Figure 8In one embodiment of this application, a back netting straightening device 600 is used to straighten the position of a back netting that has just been pasted but whose adhesive has not yet cured. The back netting straightening device 600 includes a frame 610, a straightening conveying mechanism 620, a roller straightening frame 630, an adjusting cylinder 640, and a visual comparison mechanism 650. The straightening conveying mechanism 620 and the visual comparison mechanism 650 are both mounted on the frame 610. A reciprocating adjusting platform 660 is slidably mounted on the frame 610 above the straightening conveying mechanism 620. The roller straightening frame 630 is rotatably mounted on the reciprocating adjusting platform 660, and a straightening motor 670 is provided on the reciprocating adjusting platform 660 to drive the roller straightening frame 630 to rotate. The visual comparison mechanism 650 is electrically connected to the drive mechanism of the straightening motor 670 and the reciprocating adjusting platform 660. The straightening conveying mechanism 620 can be a precision belt conveyor with a lateral positioning mechanism to facilitate the positioning of the flexible sheet and improve the straightening accuracy. The visual comparison mechanism 650 includes an industrial camera and an image processing system, which are conventional technical means. For details on the specific cooperation between the two, please refer to patents such as CN103645743B-Visual Alignment Control System and Method, CN106530357B-Visual Alignment Control Device and Calibration Method, and CN115200480A-An Alignment and Fitting Visual Inspection System. This application does not elaborate on the specific principles of their cooperation in product alignment detection. The reciprocating adjustment platform 660 in this application can reciprocate along the conveying direction of the correction conveying mechanism 620 to adapt to the correction back net.

[0074] To gently and effectively move the back mesh without damaging the sheet or causing wrinkles, the adjusting cylinder 640 employs an adaptive floating structure. See also Figure 8 and Figure 9The roller straightening frame 630 has sliding grooves 631 at both ends, and sliding blocks 632 are slidably installed in each sliding groove 631. A return spring 633 connected to the sliding block 632 is provided in each sliding groove 631. Each sliding block 632 has a mounting block 635 rotatably mounted on it via a rotating shaft 634. A torsion spring 636 for resetting the mounting block 635 relative to the sliding block 632 is fitted on the rotating shaft 634. The two ends of the adjusting cylinder 640 are rotatably mounted on the two mounting blocks 635. When the adjusting cylinder 640 is pressed against the back mesh and the correcting motor 670 drives it to rotate at an angle, the two ends of the adjusting cylinder 640 may be subjected to asymmetrical forces due to the deformation resistance of the back mesh and the unevenness of the sheet surface. At this time, the two mounting blocks 635 can swing independently around the rotating shaft 634, and the two sliding blocks 632 can also float up and down independently, thereby adaptively adjusting the tilt angle and the height of the two ends of the adjusting cylinder 640, ensuring that the adjusting cylinder 640 always maintains good and uniform contact with the back mesh and the sheet surface. This is beneficial for adapting to the adhesion force of different areas on the back mesh, which can effectively drive the back mesh to twist without generating excessive local stress that would cause the back mesh to twist and affect the bonding quality of the two.

[0075] In practice, during the process of straightening and conveying the flexible sheet in this application, before the sheet enters the working area of ​​the roll forming straightening frame 630, the industrial camera has already captured images of the back net and the flexible sheet. The image processing system then controls the straightening motor 670 to rotate at an appropriate angle based on the misalignment, thereby causing the back net to twist relative to the flexible sheet to correct their relative positions. Since the back net and the flexible sheet are not firmly bonded before roll forming, and are only partially bonded, the straightening motor 670, through the adjusting cylinder 640, can partially twist the back net and the flexible sheet. After being rolled by the adjusting cylinder 640, the adhesion between the two increases significantly. If the adjusting cylinder 640 twists and rolls the unrolled area, the unrolled part of the back net is more likely to twist relative to the flexible sheet, while the rolled part will not twist significantly relative to the flexible sheet. This application utilizes this characteristic to ensure that when the adjusting cylinder 640 performs multiple twisting adjustments, the rolled back net will not slip or twist excessively with the flexible sheet, thus affecting the quality of the rolling process. During the twisting and rolling process of a back net and its corresponding flexible sheet, it usually starts from the end along the conveying direction. Because the back net has a certain degree of flexibility and there is a certain adhesive area between it and the back of the flexible sheet, the entire process of rolling the back net with the flexible sheet requires multiple twisting and rolling operations to ensure maximum correction and adhesion. The specific number of corrections required depends on the flexibility of the back net and the adhesive strength of the glue, which will not be detailed here. Typically, after the adjusting cylinder 640 corrects once, the unrolled area of ​​the back mesh near the feeding direction of the adjusting cylinder 640 will be rectified. Therefore, the adjusting cylinder 640 will directly roll this area until misalignment occurs in the unrolled area in the feeding direction of the adjusting cylinder 640. Then, the adjusting cylinder 640 will perform a second twist, and this process will be repeated multiple times to complete the rolling. During this rolling correction process, the visual comparison mechanism 650 needs to capture and process image data of the unrolled area of ​​the back mesh and the flexible sheet in real time, and then update the data in real time to ensure the normal correction operation of the adjusting cylinder 640.

[0076] Furthermore, to prevent unnecessary swaying of the adjusting cylinder 640 during the correction process and to ensure its reset accuracy, a balance bar 637 is hinged to one swinging end of each of the two mounting blocks 635. One balance bar 637 has a connecting cylinder 638 at its outward end, and the other balance bar 637 has a rotatable insertion part at its outward end, which can be screwed into the connecting cylinder 638. By rotating the insertion part, the total length of the two balance bars 637 can be adjusted, thereby locking the relative swing angle of the two mounting blocks 635 or providing damping. This constitutes a balance beam structure, making the force on both ends of the adjusting cylinder 640 more even.

[0077] After correction, the flexible sheet with the back mesh enters the back mesh drying device 700 to completely cure the adhesive. Subsequently, the edge trimming and polishing device 800 cuts and polishes the four sides of the flexible sheet to ensure precise dimensions and smooth edges; the edge trimming and polishing device 800 can adopt the technical solution in patent CN202322237005.3 - an edge trimming device. Finally, the stacking and unloading device 900 picks up or pushes the finished sheets one by one onto the stacking platform, neatly stacking them into a stack. The stacking and unloading device 900 can be a conventional multi-axis robot that unloads by suction, such as the technical solution in patent CN202423017038.8 - a flexible sheet stacking device, or the technical solution in CN202423050020.8 - a flexible sheet unloading and conveying device; details are not described here.

[0078] The present invention also provides a method for finishing flexible decorative sheets, comprising the following steps:

[0079] S100: The surface of the flexible sheet is polished by the flexible sheet pretreatment device 100, and the polished flexible sheet is dusted.

[0080] S200: The dust-removed flexible sheet is fed into the spray painting device 200 for a first spray of topcoat, and then into the topcoat drying device 300 for a first drying; after the first drying is completed, it is then passed through the spray painting device 200 and the topcoat drying device 300 for a second spray of topcoat and a second drying.

[0081] S300: After the flexible sheet is dried for the second time, the flexible sheet is turned over by the turning device 400;

[0082] S400: The flexible sheet conveying mechanism 520 receives the flexible sheet output by the flipping device 400. The back net unwinding mechanism 530, in conjunction with the back net cutting mechanism 540, cuts the strip-shaped back net into segments. The back net conveying mechanism 550 conveys each segment of back net to the gluing mechanism 560 for back gluing and adjusts the back net conveying direction. The output end of the gluing mechanism 560 enables the back net to contact and adhere to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism 520.

[0083] S500: After the straightening conveyor 620 receives and positions the flexible sheet output by the flexible sheet conveyor 520, the visual comparison mechanism 650 captures and identifies the flexible sheet on the straightening conveyor 620 and the back net on its back. Based on the degree and situation of misalignment between the outline of the flexible sheet and the outline of the back net output by the visual comparison mechanism 650, the straightening motor 670 drives the roller straightening frame 630 to rotate, and the reciprocating adjustment platform 660 adjusts the lateral sliding amount, thereby causing the adjustment cylinder 640 to rotate the back net relative to the flexible sheet. The above operation is repeated multiple times until the outline of the back net and the outline of the flexible sheet are completely superimposed or the degree of superposition meets the preset value.

[0084] S600: After the flexible sheet and the back mesh on its back side are straightened, the back mesh drying device 700 receives and dries the flexible sheet output by the straightening conveying mechanism 620.

[0085] S700: After the flexible sheet and its back mesh are dried, they are sent to the trimming and grinding device 800 for trimming and grinding in sequence to obtain the finished product. The stacking and unloading device 900 unloads the finished product one by one and stacks them into a stack.

[0086] In step S100 above, the grinding depth and smoothness of the flexible sheet pretreatment device 100 are designed according to actual needs. After grinding, dust removal is necessary to ensure the quality of the subsequent topcoat spraying. In steps S200 and S600 above, the drying temperature is generally 60-80℃, and the drying time is 25-30 minutes.

[0087] Step S400 is specifically detailed as follows:

[0088] S410: Flexible sheet conveying mechanism 520 receives the flexible sheet output by the flipping device 400, and the guide plates on both sides of the flexible sheet conveying mechanism 520 position the flexible sheet.

[0089] S420: The back net unwinding mechanism 530 and the guide pinch roller 545 are started. The back net unwinding mechanism 530 unwinds the back net belt, and the guide pinch roller 545 pinches the back net belt. The slide 541 drives the cross arm 542 to approach the guide pinch roller 545. After reaching the clamping position, the opening and closing cylinder 546 drives a pair of opening and closing clamping blocks 543 to clamp the ends of the back net belt output by the pair of guide pinch rollers 545. The slide 541 drives the pair of opening and closing clamping blocks 543 and the clamped back net belt to move together toward the feed end of the back net conveying mechanism 550.

[0090] S430: After the notches 549 on the pair of opening and closing clamping blocks 543 are engaged with the clamping protrusions 548 on the pair of receiving clamping rollers 547, the cutting assembly 544 cuts the back net belt into a single back net; then the pair of receiving clamping rollers 547 and the back net conveying mechanism 550 start synchronously, and at the same time the opening and closing cylinder 546 controls the pair of opening and closing clamping blocks 543 to release the back net; the pair of receiving clamping rollers 547 clamp the cut back net, and the back net conveying mechanism 550 receives the back net output by the pair of receiving clamping rollers 547; the slide 541 drives the pair of opening and closing clamping blocks 543 to reset;

[0091] S440: After the end of the back net is output from the back net conveying mechanism 550, the end of the back net is conveyed along the guiding direction of the receiving guide plate 561 due to its own weight or the guiding structure, and is finally clamped by the glue coating roller 564 and the pressure roller 565. When the glue coating roller 564 and the pressure roller 565 clamp the back net, they can simultaneously apply glue to the back net.

[0092] S450: The back netting, which is clamped by the glue-coating roller 564 and the pressure roller 565, adheres to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism 520 due to its own weight.

[0093] In step S500 above, the specific correction determination process is as follows:

[0094] If the unrolled portion of the back net does not misalign with the flexible sheet, the straightening motor 670 does not rotate, and the axis of the adjusting cylinder 640 is perpendicular to the conveying direction of the straightening conveying mechanism 620. If the unrolled portion of the back net misaligns with the flexible sheet, the area of ​​the unrolled portion of the back net that exceeds the outline of the flexible sheet is twisted a second time along the conveying direction of the straightening conveying mechanism 620, based on the outline of the flexible sheet. The above-mentioned rolling adjustment operation is repeated until the latest image data captured by the visual comparison mechanism 650 identifies that the unrolled areas no longer misalign.

[0095] It should be noted that, in this application, because the back mesh is grid-like, during the actual adjustment process, inaccurate cutting will inevitably result in crisscrossing adhesive thread ends at the edges of the back mesh. Therefore, during the recognition process, the visual comparison mechanism 650 uses the shape formed by the outermost ring of the adhesive threads as the basic basis for judging the posture and position of the back mesh. Thus, in the actual judgment process, the first step of the visual comparison mechanism 650 is to determine whether the shape of the structure formed by the outermost ring of the adhesive threads aligns with the contour of the flexible sheet, i.e., whether the corresponding edges are parallel. Only then is it determined whether the area enclosed by all the thread ends aligns with the contour of the flexible sheet. Of course, in some embodiments, the thread ends can be directly captured and identified using graphics, and then the contour formed by all the thread ends can be constructed through algorithm recognition. The specific contour of the back mesh is constructed in this way. This method has high requirements for the algorithm, but the overall accuracy is higher. This application prefers this design scheme. Of course, you can also refer to the correction scheme in patent CN202411184289.7 - an automatic correction device and correction method for soft porcelain backing mesh.

[0096] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A production line for refining flexible decorative sheets, characterized in that, include A flexible sheet pretreatment device that can polish the surface of flexible sheets; A painting device capable of spraying a finishing paint onto the flexible sheet output by the flexible sheet pretreatment device. A topcoat drying device that can dry the flexible sheet output by the spray painting device; A flipping device that can receive and flip the flexible sheet output by the paint drying device; The backing mesh attaching device is capable of receiving the flexible sheet output by the flipping device and attaching the backing mesh to the flexible sheet. A back netting correction device is capable of receiving the flexible sheet with a back netting output by the back netting device and moving the back netting relative to the flexible sheet to correct the relative position of the back netting and the flexible sheet. A back-web drying device, which can receive and dry the flexible sheet material after it has been corrected by the back-web straightening device; The edge trimming and polishing device is capable of trimming and polishing the four sides of the flexible sheet output by the back mesh drying device. A stacking and unloading device is used to unload the dried flexible sheets from the trimming and polishing device one by one and stack them into a stack.

2. The flexible decorative sheet finishing production line according to claim 1, characterized in that: The backing mesh attaching device includes a frame, a flexible sheet conveying mechanism, a backing mesh unwinding mechanism, a backing mesh cutting mechanism, and a backing mesh conveying mechanism. All of these mechanisms are mounted on the frame. The backing mesh conveying mechanism is positioned above the flexible sheet conveying mechanism. The backing mesh unwinding mechanism conveys the backing mesh to the backing mesh conveying mechanism. The backing mesh cutting mechanism is located on the frame in the area between the backing mesh unwinding mechanism and the backing mesh conveying mechanism. A gluing mechanism is located at the output end of the frame of the backing mesh conveying mechanism. This gluing mechanism applies adhesive to the backing mesh conveyed by the backing mesh conveying mechanism. The backing mesh, after being coated with adhesive and output by the gluing mechanism, can be attached to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism.

3. The flexible decorative sheet finishing production line according to claim 2, characterized in that: The glue-applying mechanism includes a receiving guide plate, a support frame, and a glue-receiving trough. The support frame is mounted on the machine frame, and both the glue-receiving trough and the receiving guide plate are disposed on the support frame. The glue-receiving trough is located at the lower end of the receiving guide plate, and the upper end of the receiving guide plate can receive the back net output by the back net conveying mechanism. A glue-applying roller is rotatably mounted in the glue-receiving trough, and a pressure roller that cooperates with the glue-applying roller is rotatably mounted on the support frame. The pressure roller and the glue-applying roller cooperate to clamp and convey the back net. A driver connected to one end of the glue-applying roller is disposed on the machine frame. The back side of the flexible sheet conveyed by the flexible sheet conveying mechanism can receive the back net clamped by the cooperation of the pressure roller and the glue-applying roller.

4. The flexible decorative sheet finishing production line according to claim 2, characterized in that: The back netting cutting mechanism includes a slide mounted on a frame, a cross arm disposed on the sliding end of the slide, a pair of opening and closing clamping blocks disposed on the cross arm, and a cutting assembly disposed on the frame. The cutting assembly is disposed on the end of the slide near the back netting unwinding mechanism. A pair of guide pinch rollers are rotatably disposed on the frame between the cutting assembly and the back netting unwinding mechanism. An opening and closing cylinder for controlling the opening and closing of the pair of opening and closing clamping blocks is disposed on the cross arm. A pair of receiving pinch rollers are disposed on the end of the frame near the back netting conveying mechanism. Each receiving pinch roller has a mutually cooperating pinching protrusion on its outer periphery. Each of the pair of opening and closing clamping blocks has a notch on one side corresponding to the pinching protrusion.

5. The flexible decorative sheet finishing production line according to claim 1, characterized in that: The flipping device includes a support frame, an infeed conveyor mechanism and an outfeed conveyor mechanism mounted on the support frame. The infeed conveyor mechanism is positioned above the outfeed conveyor mechanism and in the opposite direction. The infeed conveyor mechanism can receive the flexible sheet material output by the topcoat drying device. The outfeed end of the outfeed conveyor mechanism is connected to the infeed end of the backing mesh device. An arc-shaped guide frame is provided in the area between the outfeed end and the infeed end of the infeed conveyor mechanism on the support frame. Several guide rollers are provided on the arc-shaped guide frame. An arc-shaped guide plate is provided on the outside of the arc-shaped guide frame on the support frame. The lower end of the arc-shaped guide plate is connected to the infeed end of the outfeed conveyor mechanism. A flipping guide channel is formed between all the guide rollers and the arc-shaped guide plate. The lower end of the flipping guide channel is connected to the infeed end of the outfeed conveyor mechanism.

6. The flexible decorative sheet finishing production line according to claim 1, characterized in that: The back netting straightening device includes a frame, a straightening conveying mechanism, a roller straightening frame, an adjusting cylinder, and a visual comparison mechanism. Both the straightening conveying mechanism and the visual comparison mechanism are mounted on the frame. The two ends of the straightening conveying mechanism are respectively connected to the back netting application device and the back netting drying device. A reciprocating adjusting platform is slidably mounted on the area above the straightening conveying mechanism on the frame. The roller straightening frame is rotatably mounted on the reciprocating adjusting platform, and a straightening motor for driving the roller straightening frame to rotate is provided on the reciprocating adjusting platform. The visual comparison mechanism is electrically connected to the straightening motor. Both ends of the roller straightening frame... A sliding groove is provided, and a sliding block is slidably installed in each sliding groove. A return spring connected to the sliding block is provided in each sliding groove. Each sliding block is rotatably mounted with a mounting block via a rotating shaft. A torsion spring for resetting the mounting block relative to the sliding block is fitted on the rotating shaft. The two ends of the adjusting cylinder are rotatably mounted on two mounting blocks respectively. When the straightening motor drives the roller straightening frame to rotate, each mounting block can automatically adjust its swing angle relative to the sliding block according to the force borne by the adjusting cylinder when it contacts the back net, so as to match the height of the rotation center of the corresponding end of the adjusting cylinder.

7. The flexible decorative sheet finishing production line according to claim 6, characterized in that: Both mounting blocks have a balance bar hinged to one swinging end. One balance bar has a connecting cylinder at its outward end, and the other balance bar has a rotatable insertion part at its outward end, which can be screwed into the connecting cylinder.

8. The flexible decorative sheet finishing production line according to claim 1, characterized in that: The flexible sheet pretreatment device includes a mounting frame, a feeding conveyor line, a finishing sanding frame, and sanding rollers. The feeding conveyor line is mounted on the mounting frame, and sanding tracks are provided on both sides of the mounting frame. The finishing sanding frame is spanned above the feeding conveyor line, with its two ends slidably mounted on the corresponding sanding tracks. A reciprocating direct drive is provided on the mounting frame to drive the finishing sanding frame to slide back and forth. Mounting seats are provided at both ends of the finishing sanding frame, and the lower end of each mounting seat has an inverted U-shaped groove. Bushings are fitted at both ends of the sanding rollers, and guide grooves are provided axially on the inner walls of both bushings. The polishing roller has key blocks at both ends that mate with the guide grooves; a sliding block is vertically slidably installed in each inverted U-shaped groove, and both bushings are rotatably mounted on the sliding blocks. The bottom of each inverted U-shaped groove is connected to the sliding block via an elastic element; both ends of the polishing roller have cones with outward-pointing tips; both ends of the finishing polishing frame have sliding seats that can be reset, located on opposite sides of the two mounting seats; the downward-facing end of each sliding seat has an inverted V-shaped groove, and the inner wall of each inverted V-shaped groove abuts against the outer wall of the corresponding cone; the finishing polishing frame is equipped with a polishing motor that is drivenly connected to one end of the polishing roller.

9. A method for finishing flexible decorative sheets, comprising the following steps: S100: The surface of the flexible sheet is polished using a flexible sheet pretreatment device, and the polished flexible sheet is then dusted. S200: The dust-removed flexible sheet is fed into the spray painting device for a first spray of topcoat, and then into the topcoat drying device for a first drying; after the first drying is completed, it is then passed through the spray painting device and the topcoat drying device for a second spray of topcoat and a second drying. S300: After the flexible sheet has been dried for the second time, the flexible sheet is turned over using a turning device; S400: The flexible sheet conveying mechanism receives the flexible sheet output by the flipping device. The back net unwinding mechanism, together with the back net cutting mechanism, cuts the strip back net into segments. The back net conveying mechanism conveys each segment of back net to the gluing mechanism for back-side gluing and adjusts the back net conveying direction. The output end of the gluing mechanism enables the back net to contact and adhere to the back side of the flexible sheet conveyed by the flexible sheet conveying mechanism. S500: After the correction conveyor receives and positions the flexible sheet output by the flexible sheet conveyor, the visual comparison mechanism captures and identifies the flexible sheet on the correction conveyor and the back net on its back. The correction motor and the reciprocating adjustment platform can adjust their own rotation angle and sliding amount according to the degree and situation of misalignment between the outline of the flexible sheet and the outline of the back net output by the visual comparison mechanism, so that the adjustment cylinder can drive the back net to twist relative to the flexible sheet. Repeat the above operation multiple times until the outline of the back net and the outline of the flexible sheet are completely superimposed or the degree of superposition meets the preset value. S600: After the flexible sheet and the back net on its back side are straightened, the back net drying device receives and dries the flexible sheet output by the straightening conveying mechanism. S700: After the flexible sheet and its back mesh are dried, they are sent to the trimming and grinding device for trimming and grinding in sequence to obtain the finished product. The stacking and unloading device unloads the finished product one by one and stacks them into a stack.

10. A method for finishing flexible decorative sheets according to claim 9, characterized in that: Step S400 specifically includes the following steps: S410: The flexible sheet conveying mechanism receives the flexible sheet output by the flipping device, and the guide plates on both sides of the flexible sheet conveying mechanism position the flexible sheet. S420: The back net unwinding mechanism and guide pinch rollers are started. The back net unwinding mechanism unwinds the back net belt, and the guide pinch rollers pinch the back net belt. The slide block drives the cross arm to approach the guide pinch rollers. After reaching the clamping position, the opening and closing cylinder drives a pair of opening and closing clamping blocks to clamp the ends of the back net belt output by the pair of guide pinch rollers. The slide block drives the pair of opening and closing clamping blocks and the clamped back net belt to move together toward the feed end of the back net conveying mechanism. S430: After the notches on the pair of opening and closing clamping blocks are engaged with the clamping protrusions on the pair of receiving clamping rollers, the cutting assembly cuts the back netting into a single back netting sheet; then the pair of receiving clamping rollers and the back netting conveying mechanism start synchronously, and at the same time the opening and closing cylinder controls the pair of opening and closing clamping blocks to release the back netting; the pair of receiving clamping rollers clamp the cut back netting, and the back netting conveying mechanism receives the back netting output by the pair of receiving clamping rollers; the slide moves the pair of opening and closing clamping blocks to reset; S440: After the end of the back net is output from the back net conveying mechanism, the end of the back net is conveyed along the guiding direction of the receiving guide plate due to its own weight or the guiding structure, and is finally clamped by the glue coating roller and the pressure roller; when the glue coating roller and the pressure roller clamp the back net, glue can be applied to the back net simultaneously. S450: The back netting, which is clamped by the coating roller and the pressure roller, adheres to the back of the flexible sheet conveyed by the flexible sheet conveying mechanism due to its own weight.

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