SPC board ink-jet printer

Abstract

The invention relates to the technical field of ink-jet printers, and discloses an SPC board ink-jet printer. Comprising a bottom frame, an air suction belt, an air suction mechanism for providing negative pressure suction force for the air suction belt, a cage frame arranged above the bottom frame, a plurality of ink jet units arranged in the cage frame at intervals front and back, UV lamp sets arranged beside the ink jet units, and ink suction assemblies arranged beside the ink jet units. A stain removing mechanism used for polishing and removing ink stains on the surface of the air suction belt is arranged on the portion, below the air suction belt, of the bottom frame. According to the SPC plate ink-jet printer, the air suction belt is matched with the air suction mechanism, the SPC plate is tightly fixed to the air suction belt through negative pressure suction force, edge or local upwarp caused by vibration or deformation or uneven tension is effectively restrained, it is ensured that the distance between the plate and a spray head is stable, and dislocation or virtual printing or overlapping of jet printing patterns is avoided. The stain removing mechanism grinds and removes ink stains cured on the surface in real time or at regular intervals, and the situation that the surface of the air suction belt is uneven due to long-term accumulation of the ink stains is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printers, and particularly to an SPC board inkjet printer. Background Art

[0002] SPC boards are mostly used in indoor and outdoor decorations (such as floors, background walls), and often need to imitate the textures of natural stones and woods (such as marble patterns, wood patterns), or customize personalized patterns, and also need to withstand long-term environmental tests such as friction, humidity, and light. Therefore, a UV inkjet printer is usually selected for printing. The UV ink coating sprayed on the SPC board is quickly cured within a few seconds after being irradiated by a UV lamp to form a high-adhesion coating. After printing, there is no need to wait for drying, and the next process can be entered without waiting for drying, which significantly improves the production efficiency.

[0003] However, the existing UV inkjet printers still have the following technical defects in the printing process for SPC boards:

[0004] 1. Due to the relatively light weight of the SPC board (the density is usually 1.8 - 2.2 g / cm 3 , lower than that of traditional wood boards) and the relatively thin thickness (the common specifications are 2 - 12 mm), during the transmission and printing process, the edge or local warping phenomenon is likely to occur due to problems such as the vibration of the conveyor belt, the elastic deformation of the board itself, or uneven tension. The warping of the board will cause the distance between it and the printing nozzle to deviate from the preset value, resulting in misalignment, ghosting, or local overlap of the printed pattern, seriously affecting the printing accuracy and pattern integrity, and even requiring reprinting at the factory, increasing the production cost.

[0005] 2. During the UV inkjet printing process, the nozzle will inevitably generate ink splashing or floating particles when spraying ink. Some of the ink that does not adhere to the surface of the board will splash onto the conveyor belt, or float and settle on the surface of the conveyor belt to form ink stains. The adhesion of the ink stains on the conveyor belt after being irradiated and cured by the UV lamp is extremely strong, and it is difficult to effectively remove them by traditional wiping, solvent cleaning and other methods. The accumulated ink stains over a long time will cause the surface of the conveyor belt to be uneven, further increasing the risk of warping of the SPC board during transmission.

[0006] It can be seen that the existing technology still needs to be improved. Summary of the Invention

[0007] In view of the above deficiencies of the existing technology, the purpose of the present invention is to provide an SPC board inkjet printer, aiming to solve the technical problems of insufficient stability of board transmission and difficulty in cleaning the ink stains on the suction belt.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] An SPC board inkjet printer, comprising a chassis, a suction belt arranged on the chassis, a belt drive mechanism for driving the suction belt to move cyclically to transport SPC boards, a suction mechanism for providing negative pressure suction to the suction belt, a cage frame arranged above the chassis, a plurality of inkjet units arranged at intervals front and back in the cage frame, a UV lamp group and an ink suction component arranged beside each inkjet unit, and a stain removal mechanism for polishing and removing ink stains on the surface of the suction belt is arranged below the suction belt on the chassis.

[0010] As a further improvement of the above technical solution, the stain removal mechanism includes two side frames, a first guide rod horizontally arranged between the two side frames, a sliding seat slidably arranged on the first guide rod, a grinding wheel machine arranged on the top of the sliding seat, a lead screw horizontally rotatably arranged on the two side frames, a lead screw nut sleeved on the lead screw, and a lead screw drive structure for driving the lead screw to rotate. The lead screw nut is fixedly connected to the sliding seat, and the grinding wheel on the grinding wheel machine faces the suction belt.

[0011] As a further improvement of the above technical solution, the lead screw includes a right-hand thread lead screw part with a positive thread and a left-hand thread lead screw part with a reverse thread. The lead screw nut sleeved on the right-hand thread lead screw part is a right-hand thread lead screw nut, and the lead screw nut sleeved on the left-hand thread lead screw part is a left-hand thread lead screw nut. There are two sliding seats and grinding wheel machines, and the two sliding seats are respectively connected to the right-hand thread lead screw nut and the left-hand thread lead screw nut.

[0012] As a further improvement of the above technical solution, the side frame includes an upper shelf plate fixed on the chassis and a lower shelf plate whose relative position with the upper shelf plate can be changed. An upper adjustment block is arranged on the side surface of the upper shelf plate, and a lower adjustment block corresponding to the upper adjustment block is arranged on the side surface of the lower shelf plate. A vertically extending through hole is opened on the upper adjustment block, and a vertically extending first threaded hole is opened on the lower adjustment block. An adjustment screw passes through the through hole from top to bottom and cooperates with the first threaded hole; a plurality of vertically extending waist-shaped holes are opened on the lower shelf plate, and a second threaded hole corresponding to the waist-shaped holes is opened on the upper shelf plate. A fixing screw passes through the waist-shaped hole and then cooperates with the second threaded hole.

[0013] As a further improvement of the above technical solution, the lead screw drive structure is a handwheel.

[0014] As a further improvement of the above technical solution, a cleaning and moisturizing mechanism is arranged on the chassis. The cleaning and moisturizing mechanism includes two guide rails extending front and back, a sliding frame slidably arranged on the two guide rails, an ink receiving tray arranged on the sliding frame, a nozzle moisturizing structure and a nozzle cleaning structure. The sliding frame is driven by a displacement cylinder to enter or exit the cage frame.

[0015] As a further improvement of the above technical solution, the nozzle cleaning structure includes two second guide rods fixedly arranged on the carriage and extending horizontally, a linear bearing block slidably arranged on the second guide rods, and a translation seat arranged on the two linear bearing blocks. The translation seat extends in the front-back direction, and a plurality of air suction cleaning seats are arranged on the translation seat corresponding to the distribution of the inkjet units. The translation seat moves left and right under the traction of a traction mechanism.

[0016] As a further improvement of the above technical solution, the air suction cleaning seat includes a cushioning frame, a nozzle docking block arranged on the top of the cushioning frame, and an air extraction pipe vertically arranged on the cushioning frame. A through groove extending along the width of the nozzle docking block is formed in the middle of the nozzle docking block. The air extraction pipe is threadedly connected to the bottom of the through groove. The nozzle docking block is provided with ink guide slopes on both sides of the through groove.

[0017] As a further improvement of the above technical solution, the nozzle moisturizing structure includes a plurality of moisturizing plates arranged at intervals in the front-back direction. The number of moisturizing plates is the same as that of the inkjet units and they correspond one by one.

[0018] Advantages of the present invention: The SPC board inkjet printer provided by the present invention, through the cooperation of the air suction belt and the air suction mechanism, uses negative pressure suction to tightly fix the SPC board on the air suction belt, effectively suppressing edge or local warping caused by vibration, deformation or uneven tension, ensuring a stable distance between the board and the nozzle, avoiding misalignment, ghosting or overlapping of the printed pattern, significantly improving the printing accuracy and pattern integrity, reducing the reprint rate of products returned to the factory, and reducing production costs. The stain removal mechanism polishes and removes the cured ink stains on its surface in real time or regularly, avoiding unevenness on the surface of the air suction belt caused by long-term accumulation of ink stains. This design not only reduces the maintenance difficulty of manual wiping or solvent cleaning, but also prevents the risk of board warping aggravated by the unevenness of the air suction belt, and prolongs the service life of the air suction belt and the whole machine. Description of the Drawings

[0019] Figure 1 It is a three-dimensional view of the cleaning and moisturizing mechanism in the non-working state of the SPC board inkjet printer provided by the present invention.

[0020] Figure 2 It is a three-dimensional view of the cleaning and moisturizing mechanism in the working state of the SPC board inkjet printer provided by the present invention.

[0021] Figure 3 It is a three-dimensional view of the stain removal mechanism.

[0022] Figure 4 It is a three-dimensional view of the cleaning and moisturizing mechanism.

[0023] Figure 5 It is a three-dimensional view of the air suction cleaning seat.

[0024] Figure 6 Isometric view of the centering mechanism.

[0025] Description of main component symbols: 11 - chassis, 12 - suction belt, 13 - belt drive mechanism, 21 - cage, 22 - inkjet unit, 23 - UV lamp unit, 24 - ink absorption component, 3 - cleaning and moisturizing mechanism, 31 - guide rail, 32 - carriage, 33 - ink receiving tray, 34 - nozzle moisturizing structure, 341 - moisturizing tray, 35 - nozzle cleaning structure, 351 - second guide rod, 352 - linear bearing block, 353 - translation base, 4 - suction and cleaning base, 41 - elevation stand, 42 - nozzle docking block, 421 - through slot, 422 - ink guiding slope, 43 - exhaust duct, 5 - traction mechanism, 51 - first synchronous pulley, 52 - second synchronous pulley, 53 - synchronous belt, 36 - displacement cylinder, 6 - stain removal mechanism, 61 - side frame, 611 - upper shelf plate, 612 - lower shelf plate, 613 - upper adjustment block, 614 - lower adjustment block, 615 - adjustment screw, 616 - kidney-shaped hole, 62 - first guide rod, 63 - sliding seat, 64 - grinding wheel, 651 - right-handed screw part, 652 - left-handed screw part, 661 - right-handed screw nut, 662 - left-handed screw nut, 67 - handwheel, 7 - centering mechanism, 71 - frame, 72 - belt transmission structure, 73 - top frame, 74 - guide wheel structure, 75 - double-shaft reducer, 76 - centering drive motor, 77 - pull rod. Detailed implementation manners

[0026] The present invention provides an SPC board inkjet printer. To make the objectives, technical solutions and effects of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0027] Please refer to Figures 1 to 3 , the present invention provides an SPC board inkjet printer, including a chassis 11, a suction belt 12 arranged on the chassis 11, a belt drive mechanism 13 for driving the suction belt 12 to move in a cycle to transport the SPC board, a suction mechanism for providing negative pressure suction to the suction belt 12, a cage 21 arranged above the chassis 11, a plurality of inkjet units 22 arranged at intervals in the front and back in the cage 21, a UV lamp unit 23 and an ink absorption component 24 arranged beside each inkjet unit 22. The chassis 11 is provided with a stain removal mechanism 6 for grinding and removing the ink stains on the surface of the suction belt 12 below the suction belt 12.

[0028] Under the action of the air suction mechanism (such as a negative pressure fan, a vacuum chamber, etc.), a uniform negative pressure suction force is generated on the surface of the air suction belt 12, and the SPC board to be printed is tightly adsorbed on the air suction belt 12. The air suction belt 12 is driven by the belt driving mechanism 13 to move in a cycle, and the board is transported to pass under each inkjet unit 22 in turn. Since the SPC board is negatively adsorbed, it can effectively offset the edge or local warping caused by factors such as the vibration of the air suction belt 12, the elastic deformation of the board itself, or the uneven tension, and ensure that the distance between the board and the inkjet nozzle is stably maintained at a preset value.

[0029] When the board moves to pass under the inkjet unit 22 along with the air suction belt 12, the inkjet unit 22 sprays UV ink on the surface of the board to form a preset pattern; subsequently, the UV lamp group 23 irradiates the just-printed UV ink, so that the ink quickly cures within a few seconds to form a high-adhesion coating. During this process, the ink suction component 24 (possibly a negative pressure suction pipe structure) can assist in collecting the splashed or floating ink particles and reduce the splashing of the ink onto the air suction belt 12.

[0030] When the air suction belt 12 moves in a cycle, the return section of the air suction belt 12 that does not carry the board (i.e., the part below the belt) will pass through the stain removal mechanism 6 provided on the chassis 11. The stain removal mechanism 6 removes the cured ink stains on the surface of the belt in real time or regularly by physical polishing, so as to avoid the unevenness of the surface of the air suction belt 12 caused by the accumulation of ink stains.

[0031] The SPC board inkjet printer provided by the present invention, through the cooperation of the air suction belt 12 and the air suction mechanism, uses the negative pressure suction force to tightly fix the SPC board on the air suction belt 12, effectively suppressing the edge or local warping caused by vibration, deformation or uneven tension, ensuring the stability of the distance between the SPC board and the nozzle, avoiding the misalignment, ghosting or overlapping of the printed pattern, significantly improving the printing accuracy and pattern integrity, reducing the reprint rate of returning to the factory, and reducing the production cost. The stain removal mechanism 6 polishes and removes the cured ink stains on its surface in real time or regularly, so as to avoid the unevenness of the surface of the air suction belt 12 caused by the long-term accumulation of ink stains. This design not only reduces the maintenance difficulty of manual wiping or solvent cleaning, but also prevents the risk of board warping aggravated by the unevenness of the air suction belt 12, and prolongs the service life of the air suction belt 12 and the whole machine.

[0032] See Figure 3As shown in the figure, the stain removal mechanism 6 includes two side frames 61, a first guide rod 62 horizontally arranged between the two side frames 61, a sliding seat 63 slidably arranged on the first guide rod 62, a grinding wheel machine 64 arranged on the top of the sliding seat 63, a lead screw horizontally rotatably arranged on the two side frames 61, a lead screw nut sleeved on the lead screw, and a lead screw driving structure for driving the lead screw to rotate. The lead screw nut is fixedly connected to the sliding seat 63, and the grinding wheel on the grinding wheel machine 64 faces the suction belt 12. The ink stain formed after the UV ink is cured has extremely strong adhesion (it is difficult for traditional wiping or solvent cleaning to penetrate and peel off), and the grinding wheel machine 64 can effectively peel off the cured ink stain through the direct physical friction between the high-speed rotating grinding wheel (usually using high-hardness and fine-grained abrasives such as silicon carbide or alumina) and the surface of the suction belt 12. The grinding force of the grinding wheel can directly act on the bonding interface between the ink stain and the suction belt 12. Compared with the slow penetration of chemical solvents or the local force of manual scraping, the grinding wheel machine 64 can efficiently remove stubborn ink stains in a short time, solving the technical problem that it is difficult for traditional cleaning methods to break through and remove ink stains.

[0033] Actually, the rotational speed of the grinding wheel of the grinding wheel machine 64 and the contact pressure with the suction belt 12 can be accurately adjusted through equipment parameters (such as the motor power, the position adjustment of the grinding wheel relative to the suction belt 12). For example, when the ink stain is thick, the rotational speed of the grinding wheel can be increased or the contact pressure can be increased to enhance the grinding force; when the ink stain is thin or the surface of the suction belt 12 has slight wear, the rotational speed can be reduced or the pressure can be reduced to avoid surface damage to the suction belt 12 (such as rubber or polyurethane material) caused by excessive grinding.

[0034] The cleaning grinding wheel machine 64 drives the sliding seat 63 to move horizontally along the first guide rod 62, so that the grinding wheel can cover the entire width of the suction belt 12 (the horizontal direction perpendicular to the plate transmission direction). This design ensures that there is no dead angle grinding on the surface of the suction belt 12 - whether it is the ink stain in the middle area or the edge position, it can be touched and removed by the grinding wheel. Compared with a fixed cleaning device (such as a scraper or brush that can only clean the middle area of the suction belt 12), the horizontal movement ability of the grinding wheel machine 64 completely avoids the problem of unevenness on the surface of the suction belt 12 caused by local ink stain residue, and reduces the risk of warping of the SPC plate due to the protrusion or depression of the suction belt 12 from the source.

[0035] Preferably, the grinding wheel machine 64 is arranged below the suction belt 12 (that is, the return section of the suction belt 12), and the ink stain removal can be completed synchronously during the cyclic movement of the suction belt 12. For example, when the suction belt 12 carries the plate forward to complete printing, the return section of the suction belt 12 will automatically pass under the grinding wheel machine 64. At this time, the grinding wheel starts to grind, without the need to stop the machine to disassemble the suction belt 12 or interrupt the printing process, avoiding the production stagnation caused by the need for shutdown maintenance in traditional cleaning methods, and significantly improving the continuous operation efficiency of the UV inkjet printer.

[0036] In a specific embodiment, in order to improve the grinding efficiency, the lead screw includes a right-hand lead screw portion 651 with a right-hand thread and a left-hand lead screw portion 652 with a left-hand thread. The lead screw nut sleeved on the right-hand lead screw portion 651 is a right-hand lead screw nut 661, and the lead screw nut sleeved on the left-hand lead screw portion 652 is a left-hand lead screw nut 662. There are two slide seats 63 and two grinders 64, and the two slide seats 63 are respectively connected to the right-hand lead screw nut 661 and the left-hand lead screw nut 662. The traditional single grinder 64 needs to move from one side of the suction belt 12 to the other side to complete the full-width grinding (such as a one-way movement from left to right), while the design of the double slide seats 63 with forward and reverse lead screws enables the two grinders 64 to move synchronously in opposite directions (that is, the double grinders 64 grind synchronously away from the center to both sides or converge from both sides to the center). This not only significantly shortens the time required for a single full-width cleaning, but also ensures that the ink stains on the left and right edges and the middle area of the suction belt 12 are evenly removed, further improving the overall flatness of the surface of the suction belt 12.

[0037] The thickness of the ink stain after UV ink curing will change dynamically due to factors such as printing frequency and ink splash volume (such as the ink stain thickening after long-term continuous printing). At the same time, the suction belt 12 (such as made of rubber) will gradually wear and become thinner due to long-term use. Therefore, the side frame 61 includes an upper shelf plate 611 fixed on the bottom frame 11 and a lower shelf plate 612 whose relative position with the upper shelf plate 611 can be changed. The side of the upper shelf plate 611 is provided with an upper adjusting block 613, and the side of the lower shelf plate 612 is provided with a lower adjusting block 614 corresponding to the upper adjusting block 613. A vertically extending through hole is opened on the upper adjusting block 613, and a vertically extending first threaded hole is opened on the lower adjusting block 614. The adjusting screw 615 passes through the through hole from top to bottom and cooperates with the first threaded hole; a plurality of vertically extending waist-shaped holes 616 are opened on the lower shelf plate 612, and a second threaded hole corresponding to the waist-shaped holes 616 is opened on the upper shelf plate 611. The fixing screw passes through the waist-shaped holes 616 and then cooperates with the second threaded hole. When the ink stain is thick, loosen the fixing screw, and then make the upper adjusting block 613 and the lower adjusting block 614 approach each other by tightening the adjusting screw 615, so that the grinding wheel is closer to the suction belt 12, increasing the grinding pressure to completely remove stubborn ink stains. When the ink stain is thin or the suction belt 12 has been worn, loosen the adjusting screw 615 upward to reduce the contact pressure between the grinding wheel and the belt, and avoid damaging the surface of the belt due to excessive grinding. Loosen the fixing screw, push the lower adjusting block 614 to move up and down by rotating the adjusting screw 615, quickly adjust the lower shelf plate 612 to the target height. After confirming the height, tighten the fixing screw to rigidly fix the lower shelf plate 612 and the upper shelf plate 611, ensuring the stable position of the grinder 64 during the grinding process.

[0038] In this embodiment, the lead screw drive structure is a handwheel 67. The operator can directly control the forward and reverse rotation of the lead screw by manually rotating the handwheel 67, thereby driving the movement of the grinder 64. When observing that the local ink stains on the suction belt 12 are stubborn (such as the edge area), the handwheel 67 can be manually rotated to let the grinder 64 reciprocally grind at the target position to strengthen the cleaning specifically.

[0039] See Figures 1 to 4 As shown, a cleaning and moisturizing mechanism 3 is provided on the chassis 11. The cleaning and moisturizing mechanism 3 includes two guide rails 31 extending forward and backward, a carriage 32 slidably disposed on the two guide rails 31, an ink receiving tray 33 disposed on the carriage 32, a nozzle moisturizing structure 34, and a nozzle cleaning structure 35. The carriage 32 is driven by a displacement cylinder 36 to enter or exit the cage 21. The cleaning and moisturizing mechanism 3 can be automatically driven by the displacement cylinder 36 to move the carriage 32 along the guide rail 31 to the maintenance position (directly below the nozzle) during equipment standby, shift change, or fault shutdown, and automatically exit after completing moisturizing or cleaning, without manual handling or manual adjustment. This automated maintenance mode significantly shortens the downtime caused by nozzle maintenance and ensures the continuous production efficiency of the UV inkjet printer.

[0040] The nozzle moisturizing structure 34 covers the surface of the nozzle during the non-printing state of the equipment (such as temporary shutdown, standby at night), forming a closed or high-humidity environment, effectively delaying the curing speed of the UV ink due to exposure to the air. This design fundamentally reduces the problem of nozzle clogging caused by ink drying, reduces the replacement frequency of the nozzle, and significantly reduces the equipment usage cost.

[0041] The nozzle cleaning structure 35 can regularly remove the residual ink stains, dust, or cured particles on the surface of the nozzle, suck the clogged nozzles, and dredge the internal ink channels. The waste ink and cleaning waste liquid generated during the cleaning process are centrally collected by the ink receiving tray 33 to prevent the waste liquid from dripping onto the suction belt 12, the chassis 11, or the surface of the SPC board.

[0042] Specifically, the nozzle cleaning structure 35 includes two second guide rods 351 that are horizontally extended and fixedly arranged on the carriage 32, a linear bearing block 352 that is slidably arranged on the second guide rods 351, and a translation seat 353 that is arranged on the two linear bearing blocks 352. The translation seat 353 extends in the front-back direction. A plurality of suction cleaning seats 4 are correspondingly arranged on the translation seat 353 according to the distribution of the inkjet units 22. The translation seat 353 moves left and right under the traction of the traction mechanism 5. When the equipment needs to clean the nozzles, the displacement cylinder 36 drives the carriage 32 to move along the guide rail 31 to directly below the cage 21 (below the nozzles), so that the whole cleaning structure enters the maintenance position. At this time, the translation seat 353 is aligned with the initial column (such as the leftmost column) of the nozzle array. At this time, the suction cleaning seats 4 on the translation seat 353 respectively correspond to the nozzles in the same column of a plurality of inkjet units 22. When the suction cleaning seat 4 is aligned with the target nozzle, the internal negative pressure fan starts to work, and the suction cleaning seat 4 adsorbs the residual UV ink, dust or cured particles on the surface of the nozzle through negative pressure; at the same time, the nozzles in the same column of a plurality of inkjet units 22 are cleaned. Then the traction mechanism 5 starts and drives the translation seat 353 to move left and right along the second guide rods 351. Since the suction cleaning seats 4 on the translation seat 353 are correspondingly arranged according to the distribution of the inkjet units 22, the suction cleaning seats 4 are aligned with the next column of nozzles, and the cleaning steps are repeated. Through continuous translation, the suction cleaning seats 4 cover all columns of the nozzle array column by column, and finally the cleaning of all nozzles is completed. After the cleaning of one column is completed, the traction mechanism 5 drives the translation seat 353 to reset to the initial position, and the displacement cylinder 36 drives the carriage 32 to withdraw from the cage 21, and the equipment resumes the printing state.

[0043] By setting like this, the number of the suction cleaning seats 4 can be reduced, ensuring sufficient suction force and cleaning all nozzles in an orderly manner.

[0044] See Figure 5As shown, the air suction and cleaning seat 4 includes a cushioning frame 41, a nozzle docking block 42 disposed on the top of the cushioning frame 41, and an air extraction pipe 43 vertically disposed on the cushioning frame 41. The air extraction pipe 43 is connected to a negative pressure air extraction device. A through groove 421 extending along the width of the nozzle docking block 42 is formed in the middle of the nozzle docking block 42. The air extraction pipe 43 is threadedly connected to the bottom of the through groove 421. The nozzle docking block 42 is provided with ink guiding inclined surfaces 422 on both sides of the through groove 421. The through groove 421 of the nozzle docking block 42 extends along its width (consistent with the length direction of the nozzle row), and the width matches the nozzle distribution range of the nozzle row (such as covering a row of nozzles 200 mm long). When the air suction and cleaning seat 4 is aligned with the target nozzle, the through groove 421 can completely cover the area below several nozzles in the same row. The air extraction pipe 43 adsorbs through the negative pressure at the bottom of the through groove 421 to accurately remove the residual ink stains, cured particles or cleaning waste liquid on the surface of the nozzle. The ink guiding inclined surfaces 422 on both sides of the through groove 421 can converge the waste liquid or splashed ink on the surface of the nozzle towards the center of the through groove 421. When the cleaning liquid is sprayed onto the surface of the nozzle, part of the liquid may flow to both sides. The ink guiding inclined surfaces 422 can guide it into the through groove 421 to prevent the liquid from dripping onto the air suction belt 12 or other parts of the device (such as the UV lamp group 23) and causing secondary pollution.

[0045] The design of the ink guiding inclined surface 422 (usually inclined 15°-30° towards the ink receiving tray 33) can centrally guide the waste ink generated during the cleaning process to the ink receiving tray 33. All the waste liquid and ink residues generated during the cleaning are uniformly collected by the ink receiving tray 33, eliminating the need for manual wiping of the device surface or cleaning of scattered ink stains.

[0046] See Figure 4 As shown, the nozzle moisturizing structure 34 includes a plurality of moisturizing trays 341 arranged at intervals in the front-rear direction. The number of moisturizing trays 341 is the same as and corresponds one-to-one with the number of inkjet units 22. The moisturizing trays 341 can be filled with highly absorbent sponges, non-woven fabrics or fiber cotton, and a special moisturizing liquid for UV ink is adsorbed on their surfaces; the number of moisturizing trays 341 is the same as and corresponds one-to-one with the number of inkjet units 22. Each moisturizing tray 341 completely covers the nozzles on the corresponding entire inkjet unit 22, providing sufficient humidity to ensure that the nozzles of each nozzle are in a wet state.

[0047] A plurality of rectangular pipes extending in the front-rear direction are arranged inside the air suction belt 12. The plurality of rectangular pipes are arranged in parallel in the front-rear direction (the sheet conveying direction). A plurality of air suction openings are formed on the upper surface of each rectangular pipe (usually arranged at equal intervals). After the rectangular pipes are connected to the negative pressure air extraction device, a grid-like uniform negative pressure field can be formed on the surface of the belt. The edges and the middle areas of the SPC sheets can obtain consistent adsorption forces (the suction deviation ≤ 5%), effectively offsetting the edge warping caused by transmission vibration or elastic deformation of the sheets.

[0048] In this embodiment, two cage frames 21 are provided and arranged in parallel in the middle of the suction belt 12. The parallel arrangement of the two cage frames 21 generally means that the equipment is configured with more inkjet units 22 (for example, 4 groups of inkjet units 22 are arranged in each cage frame 21, and the total number reaches 8 groups), and the number of nozzles increases significantly. The high-density nozzle array has higher requirements for the timeliness and comprehensiveness of cleaning and moisturizing. A cleaning and moisturizing mechanism 3 is provided upstream of one of the cage frames 21, and a cleaning and moisturizing mechanism 3 is provided downstream of the other cage frame 21, which can make full use of the idle areas on both sides of the suction belt 12 and shorten the overall length of the SPC board inkjet printer.

[0049] In order to correct the position of the SPC board before it enters the suction belt 12 and ensure that the center line of the SPC board coincides strictly with the center line of the suction belt 12, a centering mechanism 7 is provided upstream of the suction belt 12. As shown in Figure 6 the figure, the centering mechanism 7 includes a frame 71, a belt transmission structure 72 provided on the frame 71, a top frame 73 provided on the belt transmission structure 72, two guide wheel structures 74 slid laterally at the bottom of the top frame 73, and a distance adjustment structure for controlling the two guide wheel structures 74 to approach or move away from each other. The distance adjustment structure includes a dual-axis reduction gear 75 provided on the top frame 73 and a centering drive motor 76 connected to the dual-axis reduction gear 75. The two output shafts of the dual-axis reduction gear 75 are respectively connected to the corresponding guide wheel structures 74 through pull rods 77. The distance adjustment structure controls the forward and reverse rotation of the output shafts of the dual-axis reduction gear 75 through the centering drive motor 76, drives the guide wheel structures 74 to quickly approach or move away, and can automatically adjust the distance between the guide wheels according to the width of the SPC board. The rolling contact method of the guide wheels can reduce the frictional resistance to the board and reduce the deformation of the board caused by forced centering (such as the local bending of thin SPC boards caused by extrusion), further reducing production losses.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0051] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An SPC board inkjet printer, characterized in that, It includes a chassis, a suction belt arranged on the chassis, a belt driving mechanism for driving the suction belt to move cyclically to transport SPC boards, a suction mechanism for providing negative pressure suction to the suction belt, a cage arranged above the chassis, a plurality of inkjet units arranged at intervals front and back in the cage, a UV lamp group and an ink suction component arranged beside each inkjet unit. A stain removing mechanism for polishing and removing the ink stains on the surface of the suction belt is arranged below the suction belt on the chassis.

2. The SPC sheet inkjet printer according to claim 1, characterized in that, The stain removing mechanism includes two side frames, a first guide rod horizontally arranged between the two side frames, a sliding seat slidably arranged on the first guide rod, a grinding machine arranged on the top of the sliding seat, a lead screw horizontally rotatably arranged on the two side frames, a lead screw nut sleeved on the lead screw, and a lead screw driving structure for driving the lead screw to rotate. The lead screw nut is fixedly connected to the sliding seat, and the grinding wheel on the grinding machine faces the suction belt.

3. The SPC sheet inkjet printer according to claim 2, wherein, The lead screw includes a right-handed thread lead screw part with a positive thread and a left-handed thread lead screw part with a reverse thread. The lead screw nut sleeved on the right-handed thread lead screw part is a right-handed thread lead screw nut, and the lead screw nut sleeved on the left-handed thread lead screw part is a left-handed thread lead screw nut. There are two sliding seats and grinding machines, and the two sliding seats are respectively connected to the right-handed thread lead screw nut and the left-handed thread lead screw nut.

4. The SPC sheet inkjet printer according to claim 2, characterized in that, The side frame includes an upper shelf plate fixed on the chassis and a lower shelf plate whose relative position to the upper shelf plate can be changed. An upper adjusting block is arranged on the side of the upper shelf plate, and a lower adjusting block corresponding to the upper adjusting block is arranged on the side of the lower shelf plate. A vertically extending through hole is opened on the upper adjusting block, and a vertically extending first threaded hole is opened on the lower adjusting block. An adjusting screw passes through the through hole from top to bottom and is matched with the first threaded hole; a plurality of vertically extending waist-shaped holes are opened on the lower shelf plate, and a second threaded hole corresponding to the waist-shaped holes is opened on the upper shelf plate. A fixing screw passes through the waist-shaped hole and is matched with the second threaded hole.

5. The SPC sheet inkjet printer according to claim 2, wherein, The lead screw driving structure is a handwheel.

6. The SPC sheet inkjet printer according to claim 1, characterized in that, A cleaning and moisturizing mechanism is arranged on the chassis. The cleaning and moisturizing mechanism includes two guide rails extending front and back, a sliding frame slidably arranged on the two guide rails, an ink receiving tray arranged on the sliding frame, a nozzle moisturizing structure and a nozzle cleaning structure. The sliding frame is driven by a displacement cylinder to enter or exit the cage.

7. The SPC sheet inkjet printer according to claim 6, wherein, The nozzle cleaning structure includes two second guide rods horizontally extending and fixedly arranged on the sliding frame, a linear bearing seat slidably arranged on the second guide rods, and a translation seat arranged on the two linear bearing seats. The translation seat extends front and back, and a plurality of suction cleaning seats are arranged on the translation seat corresponding to the distribution of the inkjet units. The translation seat moves left and right under the traction of a traction mechanism.

8. The SPC sheet inkjet printer according to claim 7, characterized in that, The suction cleaning seat includes a pad elevation frame, a nozzle docking block arranged on the top of the pad elevation frame, and a suction pipe vertically arranged on the pad elevation frame. A through groove extending along the width of the nozzle docking block is opened in the middle of the nozzle docking block. The suction pipe is threadedly connected to the bottom of the through groove. The nozzle docking block is provided with guide ink slopes on both sides of the through groove.

9. The SPC sheet inkjet printer according to claim 6, wherein, The nozzle moisturizing structure includes a plurality of moisturizing trays arranged at intervals front and back. The number of moisturizing trays is the same as that of the inkjet units and they correspond one by one.

10. The SPC sheet inkjet printer according to claim 6, characterized in that, A plurality of rectangular tubes extending in the front-rear direction are arranged inside the suction belt. The plurality of rectangular tubes are arranged in parallel in the front-rear direction, and a plurality of suction openings are formed on the upper surface of each rectangular tube. The rectangular tubes are connected to a negative pressure suction device.

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