A splash-proof ink supply device for PVC decorative film intaglio printing

Abstract

The utility model relates to the intaglio printing equipment technical field, concretely relates to a kind of anti-splashing ink supply device for PVC decorative film intaglio printing, including oil groove, oil groove is equipped with oil storage cavity, and printing cylinder is rotatably arranged at the mouth of oil storage cavity, and the two opposite inner cavity walls of oil storage cavity are slidably installed with scraper, the bottom of oil groove is installed with oil supply pump, the output end of oil supply pump is communicated with oil storage cavity, the input end is communicated with oil supply pipe, the other end of oil supply pipe is inserted into oil storage cavity, and ink nozzle is installed, the utility model is in energy saving and consumption reduction aspect, using high pressure injection direct oil supply mode cooperates closed oil storage cavity design, so that ink utilization rate is promoted to more than 95%, about 40% than traditional immersion type ink saving.The built-in circulation system forms the complete ink utilization closed loop of "injection-backflow-filtration-reinjection", and the ink cost of more than 150,000 yuan per year is saved for the production line of 5000 meters per day after measurement.

Description

Technical Field

[0001] This utility model relates to the field of gravure printing equipment technology, specifically to an anti-splatter ink supply device for gravure printing of PVC decorative film. Background Technology

[0002] PVC decorative film, widely used in building materials, home furnishings, and other fields, directly impacts product added value through its surface printing quality. Traditional gravure printing equipment faces the following technical challenges in PVC film printing: Significant ink waste: In traditional immersion ink supply methods, about 30% of the ink is lost due to splashing, sedimentation, and other reasons, and the recycling rate is low, resulting in high production costs.

[0003] Cleaning and maintenance are difficult: the fixed scraper cannot completely remove the ink skin and impurities accumulated on the surface of the printing cylinder, and the frequency of machine shutdown for cleaning is high (it needs to be cleaned once every 8 hours), which affects production efficiency.

[0004] Insufficient adaptability: Most existing doctor blades are fixedly installed and cannot dynamically adjust the pressure according to the ink viscosity or printing speed, which easily leads to problems such as incomplete ink scraping or excessive wear of the roller. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an anti-splatter ink supply device for gravure printing of PVC decorative film, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides an anti-splatter ink supply device for gravure printing of PVC decorative film, including an oil tank with an oil storage cavity inside. A printing roller is rotatably installed at the opening of the oil storage cavity. Scrapers with varying distances from the printing roller are slidably installed on both opposite inner walls of the oil storage cavity. An oil supply pump is installed at the bottom of the oil tank. The output end of the oil supply pump is connected to the oil storage cavity, and the input end is connected to an oil supply pipe. The other end of the oil supply pipe extends into the oil storage cavity and is equipped with an ink nozzle, which is positioned directly below the printing roller.

[0007] Furthermore, a sealing ring is fixedly fitted at the opening of the oil storage cavity. Both outer ring walls of the sealing ring have slots that penetrate the inner ring wall. The two scrapers slide through the corresponding slots respectively.

[0008] Furthermore, mounting strips are fixedly installed on both opposite outer walls of the oil tank, and each mounting strip has a through hole, with a small screw installed in each of the two holes.

[0009] Furthermore, two telescopic electric cylinders are fixedly installed on the top of the oil tank. The output ends of the two telescopic electric cylinders are connected to L-shaped connecting rods, and the other ends of the two L-shaped connecting rods are fixedly connected to the corresponding scrapers.

[0010] Furthermore, two fixing seats are vertically fixedly installed on the top of the oil tank, and large screws are threaded onto both fixing seats. The ends of the two large screws are respectively inserted into the two ends of the printing cylinder.

[0011] The technical solution provided by this utility model has the following advantages compared with the known prior art: In terms of energy saving and consumption reduction, the high-pressure jet direct oil supply method combined with a closed oil storage chamber design increases the ink utilization rate to over 95%. Tested according to GB / T 13217.1-2008 standard, the ink transfer efficiency reaches 95.2% at a speed of 600m / min, saving approximately 40% of ink compared to traditional immersion methods. The built-in circulation system forms a complete closed loop of ink utilization: "jet-recirculation-filtration-rejet." Based on an ink unit price of 150 yuan / kg, this translates to a daily ink saving of 2.7kg.

[0012] The intelligent self-cleaning function performs exceptionally well. The retractable scraper, driven by an electric cylinder, achieves precise dynamic adjustment, thoroughly removing excess ink and powerfully scraping off various surface impurities. When deep cleaning is required, the scraper fully retracts, maintaining a sufficient gap with the roller, increasing high-pressure washing efficiency by more than four times and significantly reducing maintenance time.

[0013] The equipment boasts significantly enhanced adaptability, with doctor blade pressure automatically adjusting according to printing speed to ensure effective cleaning even during high-speed production. Its unique sealing design allows it to accommodate various inks ranging from 50-500 cP, eliminating the need for mechanical adjustments when changing ink types.

[0014] Regarding extending equipment lifespan, real-time impurity removal reduces printing cylinder wear by 50%, extending its lifespan to over one year. The modular printhead and piping design supports quick replacement, minimizing downtime. Actual application data shows that this device can reduce the overall annual cost of the production line by 280,000 yuan and increase overall equipment efficiency by 22%. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the overall first-view structure of this utility model; Figure 2 This is a schematic diagram of the overall second-view structure of this utility model; Figure 3 This is a schematic diagram of the ink nozzle and ink tank installation structure of this utility model.

[0017] The labels in the diagram represent: 1. Oil groove; 11. Sealing ring; 12. Mounting strip; 13. Small screw; 21. Telescopic electric cylinder; 22. L-shaped connecting rod; 23. Scraper; 31. Fixing base; 32. Printing roller; 33. Large screw; 41. Oil supply pump; 42. Oil supply pipe; 43. Ink printhead. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Example 1

[0021] Reference Figure 1-3This is the first embodiment of the present invention, a splash-proof ink supply device for gravure printing of PVC decorative film, comprising an oil tank 1 (made of 304 stainless steel, 5mm thick), an oil storage cavity (with polished inner wall, surface roughness Ra≤0.8μm), a printing roller 32 (with hard chrome plating, hardness ≥HRC60) rotatably mounted at the opening of the oil storage cavity, and two opposing inner walls of the oil storage cavity slidably fitted with scrapers 23 (made of high carbon tool steel SK5, hardness HRC58-62) whose distance from the printing roller 32 increases or decreases. At the bottom of 1, an oil supply pump 41 (using a corrosion-resistant stainless steel gear pump) is installed. The output end of the oil supply pump 41 is connected to the oil storage chamber, and the input end is connected to an oil supply pipe 42 (made of polytetrafluoroethylene, with an inner diameter of 8mm). The other end of the oil supply pipe 42 extends into the oil storage chamber and is equipped with an ink nozzle 43 (made of brass, with a nozzle diameter of 0.5mm). The ink nozzle 43 adopts a fan-shaped nozzle structure with a spray angle of 60° and a coverage width 10mm longer than the printing cylinder 32 to ensure uniform ink supply across the entire surface. The ink nozzle 43 is positioned directly below the printing cylinder 32 (the spacing is adjustable from 10 to 50mm).

[0022] Example 2

[0023] Reference Figure 1-3 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a sealing ring 11 (made of fluororubber, Shore hardness 70±5) is fixedly fitted at the opening of the oil storage cavity. Both outer ring walls of the sealing ring 11 have strip-shaped openings (the width of which is 0.2mm larger than the thickness of the scraper 23) that penetrate the inner ring wall. The two scrapers 23 slide through the corresponding strip-shaped openings. Both outer ring walls of the oil tank 1 are fixedly installed with mounting strips 12 (made of aluminum alloy). Both mounting strips 12 have strip-shaped holes (50mm in length) that penetrate the two strip-shaped holes. Small screws 13 (stainless steel hexagonal screws) are installed in both strip-shaped holes.

[0024] Two telescopic electric cylinders 21 (stroke 50mm, thrust 200N) are fixedly installed on the top of the oil tank 1. Each of the two telescopic electric cylinders 21 has an L-shaped connecting rod 22 (45# steel, chrome-plated) connected to its output end. The other end of each L-shaped connecting rod 22 is fixedly connected to a corresponding scraper 23 (using M4 hexagonal socket screws). Two openings are formed at the top of the oil tank 1. The bottom of each L-shaped connecting rod 22 extends through these openings and is fixedly connected to the top of the scraper 23. Two fixed seats 31 (cast iron) are vertically fixedly installed at the top of the oil tank 1. Large screws 33 (M10×50) are threaded onto each fixed seat 31. The ends of the two large screws 33 are inserted into both ends of the printing roller 32 (with a clearance of 0.05-0.1mm). The telescopic electric cylinders 21 are synchronously controlled by a PLC control system (Siemens S7-200), with a response time ≤0.1s and a position repeatability of ±0.01mm. The control process includes: (1) Initialization phase: The two electric cylinders extend synchronously to the preset zero position; (2) Working stage: The stroke is automatically adjusted according to the printing speed (the stroke decreases by 0.1mm for every 100m / min increase in speed); (3) Maintenance phase: The two electric cylinders retract synchronously to the maximum spacing position.

[0025] The remaining structure is the same as that in Example 1.

[0026] The working process of this ink supply device can be divided into four main stages: ink supply, ink scraping, circulation, and cleaning. The components work together as follows: Ink supply stage The ink pump 41 draws ink from the oil storage tank and delivers it to the ink nozzle 43 via the ink supply pipe 42. The ink nozzle 43 sprays the ink directly onto the surface of the printing cylinder 32 at a pressure of 0.3-0.6 MPa. The sealed structure formed by the sealing ring 11 and the oil tank 1 effectively prevents ink splashing.

[0027] ink scraping stage The telescopic electric cylinder 21 drives the L-shaped connecting rod 22, causing the scraper 23 to maintain a working gap of 0.1-0.5mm with the printing cylinder 32. During the printing process: Scraper 23 removes excess ink from the surface of printing cylinder 32; At the same time, remove impurities adhering to the surface of the roller; The pressure of the scraper 23 is automatically adjusted according to the printing speed.

[0028] Ink cycle stage The scraped-off ink and impurities fall back to the bottom of the oil reservoir: Impurities are intercepted by the filter screen (installed at the input end of the oil supply pump 41, the filter screen is a 316L stainless steel sintered filter element, with a filtration accuracy of 50μm); The ink flows back to the ink supply pump 41 through the circulation channel; The ink supply pump 41 delivers the ink back to the ink printhead 43.

[0029] Cleaning and maintenance phase The telescopic electric cylinder 21 fully retracts the scraper 23; A 3mm cleaning gap is formed; The printing roller 32 can be easily disassembled for cleaning; The ink printhead 43 and ink supply line 42 support quick replacement.

[0030] Work process characteristics A combination of high-pressure jetting and mechanical scraping; The doctor blade 23 can adapt to inks of different viscosities; The closed-loop design reduces ink loss; The intelligent control system automatically optimizes operating parameters.

[0031] Security protection mechanism: The oil supply pump 41 is equipped with a pressure sensor (range 0-1MPa, accuracy 0.5%FS), and automatically shuts down in case of overpressure. The telescopic electric cylinder 21 is equipped with a limit switch (Omron D4V-8100) to prevent damage to the scraper due to overtravel. The oil tank 1 is equipped with a liquid level alarm device (photoelectric sensor). When the liquid level is below 20%, the ink in the external oil storage tank is drawn by the oil pump and added to the oil tank 1. When the liquid level is below 10%, the ink supply is stopped.

[0032] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An anti-splatter ink supply device for gravure printing of PVC decorative film, comprising an ink tank (1), wherein an ink storage cavity is provided in the ink tank (1), and a printing roller (32) is rotatably disposed at the opening of the ink storage cavity, characterized in that, The two opposing inner walls of the oil storage chamber are each equipped with a scraper (23) that expands or decreases the distance between the scraper and the printing roller (32). An oil supply pump (41) is installed at the bottom of the oil tank (1). The output end of the oil supply pump (41) is connected to the oil storage chamber, and the input end is connected to an oil supply pipe (42). The other end of the oil supply pipe (42) extends into the oil storage chamber and is equipped with an ink nozzle (43). The ink nozzle (43) is located directly below the printing roller (32).

2. The anti-splatter ink supply device for gravure printing of PVC decorative film according to claim 1, characterized in that, A sealing ring (11) is fixedly fitted at the opening of the oil storage cavity. The two outer ring walls of the sealing ring (11) are both provided with strip-shaped openings that penetrate the inner ring wall. The two scrapers (23) slide through the corresponding strip-shaped openings respectively.

3. The anti-splatter ink supply device for gravure printing of PVC decorative film according to claim 1, characterized in that, The oil tank (1) has two opposite outer walls fixedly installed with mounting strips (12), and each of the two mounting strips (12) has a through hole, and each of the two holes has a small screw (13).

4. The anti-splatter ink supply device for gravure printing of PVC decorative film according to claim 1, characterized in that, Two telescopic electric cylinders (21) are fixedly installed on the top of the oil tank (1). The output ends of the two telescopic electric cylinders (21) are connected to L-shaped connecting rods (22), and the other ends of the two L-shaped connecting rods (22) are fixedly connected to the corresponding scrapers (23).

5. The anti-splatter ink supply device for gravure printing of PVC decorative film according to claim 1, characterized in that, The top of the oil tank (1) is vertically fixed with two fixing seats (31), and each fixing seat (31) is threaded with a large screw (33). The ends of the two large screws (33) are respectively inserted into the two ends of the printing roller (32).

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