Fountain solution backflow purification type alcohol fountain printing machine

Abstract

The invention discloses a fountain solution backflow purification type alcohol fountain printing machine, and belongs to the technical field of printing machines.The fountain solution backflow purification type alcohol fountain printing machine comprises a rack, a motor is fixedly installed on the right side of the rack, a fountain roller is rotationally installed on the rack, a fountain is further fixedly installed on the rack, and a branch bucket is fixedly installed on the outer side of the fountain; a fixed plate is fixedly installed below the water bucket, a movable cylinder is elastically and rotationally installed below the fixed plate, the movable cylinder is connected with the shaft part of the water bucket roller through a transmission assembly, meanwhile, the transmission assembly drives the movable cylinder to rotate in a reciprocating mode, and a lifting piston piece is elastically installed on the inner side of the movable cylinder in a lifting mode; an elastic rubber piece is fixedly connected between the lifting piston piece and the fixing plate in a sealed mode. According to the fountain solution backflow purification type alcohol fountain printing machine, dripping fountain solution can be recycled, volatilized alcohol can be recycled, the alcohol concentration of the fountain solution is ensured, and meanwhile the safety of the production environment is improved.

Description

Technical Field

[0001] This invention relates to the field of printing press technology, specifically to an alcohol-based dampening printing press with a dampening solution recirculation and purification system. Background Technology

[0002] As a core piece of equipment in offset printing, the alcohol-based dampening printing press works by supplying a dampening solution containing alcohol (usually isopropanol) to the blank areas of the printing plate. By utilizing the property of alcohol to reduce the surface tension of the dampening solution, the blank areas of the printing plate are uniformly wetted, thereby preventing ink from spreading to the blank areas and ensuring the clarity and integrity of the printed images.

[0003] The prior art (Chinese patent publication number: CN120327083A, publication date: 2025-07-18) discloses a printing liquid water supply device. The device has a printing liquid tank on its inner bottom surface. Above the printing liquid tank are a water filling component, a dampening solution filling component, an alcohol filling component, a printing liquid temperature control component, and a printing water supply pump. The printing liquid tank also has an alcohol concentration detection component, which includes a vertical float channel fixed to the top surface of the printing liquid tank. A float detection component is installed within the vertical float channel. An inlet is located at the bottom of the vertical float channel and connected to a first valve via a pipe. The first valve is connected to the printing liquid temperature control component via a pipe. An outlet is located at the top of the vertical float channel, above the printing liquid inside the printing liquid tank. This static detection method ensures the accuracy of the alcohol concentration detection results, which is more accurate and controllable than traditional dynamic detection. Prior art (Chinese Patent Publication No.: CN214056841U, Publication Date: 2021-08-27) discloses a damping solution circulation and filtration system, including a mixing tank for holding the prepared solvent, a storage tank, a printing press, a filter tank, a mixing tank, and a solvent tank. The mixing tank is connected to the storage tank via a first inlet pipe. A detachable first outlet pipe is provided below the storage tank, and a solenoid valve is provided on the first outlet pipe. Several printing presses are connected to the first outlet pipe via several inlet branch pipes. The filter tank is connected to the printing press via the first outlet branch pipe. The mixing tank is connected to the filter tank via a second outlet pipe. The solvent tank is connected to the mixing tank via a second outlet branch pipe. The mixing tank is also connected to the storage tank via a second inlet pipe. The operation of this system enables the recycling of damping solution in waste liquid.

[0004] While existing alcohol-based dampening printing presses can purify and recycle the dampening solution during use, they cannot easily reduce the evaporation of alcohol in the solution, nor can they easily recycle and reuse the evaporated alcohol. This results in the alcohol content in the dampening solution decreasing too quickly, which not only affects the printing effect but also poses a possibility of alcohol vapor explosion, thus presenting certain defects in use. Summary of the Invention

[0005] The purpose of this invention is to provide a damping solution recirculation and purification type alcohol damping printing machine to solve the problems mentioned in the background art, namely, that current alcohol damping printing machines on the market are inconvenient to reduce the evaporation of alcohol in the damping solution and are inconvenient to recycle and reuse the evaporating alcohol.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a damping solution recirculation purification type alcohol damping printing machine, comprising a frame, with a motor fixedly installed on the right side of the frame, and a water fountain roller rotatably installed on the frame, the shaft end of the water fountain roller being fixedly connected to the output end of the motor. A water glue foot is rotatably installed on the outer side of the shaft of the water fountain roller, and a cylinder is rotatably installed on the frame, the output end of the cylinder being rotatably connected to the lower end of the water glue foot. A metering roller is rotatably installed on the water glue foot, and the output end of the metering roller and the water fountain roller are connected by a transmission gear set. A damping roller assembly is also provided on the frame, and a damping roller assembly is also fixedly installed on the frame. The device includes a water hopper with a sub-hopper fixedly installed on its outer side. A fixed plate is fixedly installed below the water hopper, and a movable cylinder is rotatably mounted below the fixed plate. The movable cylinder and the shaft of the water hopper roller are connected by a transmission assembly, which drives the movable cylinder to rotate reciprocally. A lifting piston plate is elastically installed on the inner side of the movable cylinder, and an elastic rubber component is sealed and fixedly connected between the lifting piston plate and the fixed plate. When the elastic rubber component twists and returns to its original state, the waste liquid in the purified sub-hopper is recovered through a reflux assembly. A condensation assembly for absorbing and condensing alcohol is provided on the inner side of the movable cylinder, and a movable floating cover assembly is provided on the inner side of the water hopper.

[0007] Preferably, the dampening roller assembly includes a water-applying roller, a water-spreading roller, an intermediate roller, a first inking roller, and a printing plate cylinder, all rotatably mounted on the frame. The water-applying roller is attached to the outer side of the metering roller, and the water-spreading roller and the intermediate roller are attached to the outer side of the water-applying roller, while the first inking roller is attached to the outer side of the intermediate roller. The outer sides of the water-applying roller and the first inking roller are in contact with the printing plate cylinder.

[0008] Preferably, the transmission assembly includes a transmission shaft rotatably mounted on the frame, and the transmission shaft and the water bucket roller shaft are connected by a transmission belt. An incomplete gear is also rotatably connected to the lower end of the water bucket. The shaft of the incomplete gear and the transmission shaft are connected by a bevel gear assembly. A toothed ring is fixedly mounted on the outer side of the movable cylinder, and the incomplete gear and the toothed ring are meshed to drive the movable cylinder to reciprocate.

[0009] Preferably, the lifting piston plate is sealed and slidably connected to the inner side of the movable cylinder, a guide rod is fixedly installed on the inner side of the movable cylinder, and the guide rod slides through the lifting piston plate, and a spring is fixedly connected between the movable cylinder and the lifting piston plate.

[0010] Preferably, the elastic rubber component is arranged in a cylindrical structure, and during the rotation of the movable cylinder, the lifting piston plate is driven to rotate synchronously through the guide rod, and the lifting piston plate, in conjunction with the fixed plate, twists the elastic rubber component during the rotation.

[0011] Preferably, the reflux assembly includes a suction pipe fixedly connected between the hopper and the fixed plate, and a purification cylinder fixedly connected to the middle position of the lifting piston plate. The purification cylinder is sealed and installed through the lower end of the movable cylinder, and a filter membrane is installed on the purification cylinder. At the same time, a reflux pipe is rotatably connected to the purification cylinder. Both the suction pipe and the reflux pipe are equipped with a one-way valve structure, and the upper end of the reflux pipe is connected to a drain pipe. The opening of the drain pipe faces the water hopper, and the drain pipe is fixedly installed on the outside of the water hopper.

[0012] Preferably, the condensation assembly includes a condenser tube fixedly installed on the lifting piston plate, and the condenser tube is arranged in a spiral shape. The lower end of the condenser tube is connected to the space below the lifting piston plate. A liquid delivery pipe is connected between the lower space of the movable cylinder and the upper space of the lifting piston plate. Hollow air passages are opened on the water tank and the dividing tank. A suction pipe is connected between the hollow air passage and the upper end of the condenser tube. A one-way valve structure is provided on both the suction pipe and the liquid delivery pipe.

[0013] Preferably, the space between the movable cylinder and the elastic component is filled with coolant, and the space between the movable cylinder and the elastic component is connected to an external refrigeration device through a circulating cooling pipe. A one-way valve is provided on the circulating cooling pipe, and the coolant is circulated and transported during the twisting and recovery process of the elastic component.

[0014] Preferably, the movable floating cover assembly includes a float plate that is lifted and installed inside the water bucket, and the float plate is elastically and telescopically installed with a cover plate. A pull rope is fixedly connected between the end of the cover plate away from the water bucket roller and the bottom of the inner side of the water bucket, and the cover plate and the outer wall of the water bucket roller are fitted with a clearance.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the damping solution recirculation purification type alcohol damping printing machine can recover the dripping damping solution and can recover and reuse the evaporated alcohol, ensuring the alcohol concentration of the damping solution, and also improving the safety of the production environment. The specific details are as follows. 1. Equipped with a fixed plate, a movable cylinder, and an elastic rubber component, the movable cylinder is driven to reciprocate as the water fountain roller rotates, causing the lower end of the elastic rubber component to rotate synchronously. This, in turn, works with the fixed plate to twist the elastic rubber component, allowing it to draw the dripping damping solution collected in the hopper through the suction pipe. During the twisting of the elastic rubber component, the recovered damping solution is pressurized and filtered, allowing it to be quickly filtered through a filter membrane and then returned to the water fountain via the return pipe and drain pipe, achieving recycling. 2. Equipped with a condenser, suction pipe and infusion pipe, as the elastic rubber part twists and recovers, the condenser can extract the alcohol gas volatilized by the heat through the suction pipe and the cavity air passage on the water bucket and the dividing bucket, and after condensation, it is sucked into the inside of the elastic rubber part through the infusion pipe and mixed with the recycled dampening solution. It is also equipped with a circulating cooling pipe. As the elastic rubber part twists and recovers, the space between it and the movable cylinder changes repeatedly. This allows the space between the movable cylinder and the elastic rubber part to circulate coolant through the circulating cooling pipe, thereby achieving rapid cooling and condensation of the alcohol gas in the condenser.

[0016] 3. Equipped with a float plate, cover plate, and pull rope, the float plate and cover plate can cover the surface of the dampening solution in the water fountain and reduce the gap between the water fountain and the water fountain roller, thereby effectively reducing the evaporation of alcohol components in the dampening solution. When the liquid level inside the water fountain changes, the cover plate will automatically adjust under the pull of the pull rope to ensure that a suitable distance is maintained between it and the water fountain roller, which reduces the evaporation rate and ensures the normal delivery of the dampening solution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the motor and water jet roller mounting structure of the present invention; Figure 3 This is a schematic diagram of the water bucket structure from below in this invention; Figure 4 This is a partial cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the connection structure between the water bucket roller and the water bucket of the present invention; Figure 6 This is a schematic diagram of the movable cylinder mounting structure of the present invention; Figure 7 This is a schematic cross-sectional view of the water bucket and the sub-buckets of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle; Figure 9 This is a schematic diagram of the three-dimensional structure of the movable cylinder of the present invention; Figure 10 This is a schematic cross-sectional view of the movable cylinder structure of the present invention; Figure 11 This is a schematic diagram of the elastic rubber component mounting structure of the present invention; Figure 12 This is a schematic diagram of the tortuous structure of the elastic rubber component of the present invention.

[0018] In the diagram: 1. Frame; 2. Motor; 3. Water hopper roller; 4. Water-based adhesive foot; 5. Cylinder; 6. Metering roller; 7. Water-applying roller; 8. Water-spreading roller; 9. Intermediate roller; 10. First inking roller; 11. Printing plate cylinder; 12. Water hopper; 1201. Dividing hopper; 1202. Cavity air passage; 13. Drive shaft; 14. Incomplete gear; 15. Fixed plate; 16. Movable cylinder; 17. Gear ring; 18. Lifting piston plate; 1801. Guide rod; 19. Elastic rubber part; 20. Suction pipe; 21. Purification cylinder; 22. Filter membrane; 23. Return pipe; 24. Drain pipe; 25. Condenser pipe; 26. Air suction pipe; 27. Infusion pipe; 28. Circulating cooling pipe; 29. ​​Float plate; 30. Cover plate; 31. Pull rope. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Existing alcohol-based dampening printing presses are inconvenient for purifying and recycling the dampening solution during use, increasing production costs. To solve this technical problem, this example discloses the following technical content. Please refer to [link / reference]. Figures 1-6 and Figures 9-12 As shown; a frame 1, with a motor 2 fixedly mounted on the right side of the frame 1, and a water fountain roller 3 rotatably mounted on the frame 1, with the shaft end of the water fountain roller 3 fixedly connected to the output end of the motor 2. A water glue foot 4 is rotatably mounted on the outer side of the shaft of the water fountain roller 3, and a cylinder 5 is rotatably mounted on the frame 1, with the output end of the cylinder 5 rotatably connected to the lower end of the water glue foot 4. A metering roller 6 is rotatably mounted on the water glue foot 4, and the output end of the metering roller 6 and the water fountain roller 3 are connected by a transmission gear set. A dampening roller set is also provided on the frame 1, and a water fountain 12 is also fixedly mounted on the frame 1. A hopper 1201 is fixedly installed on the outer side of the hopper 12. A fixed plate 15 is fixedly installed below the hopper 12. A movable cylinder 16 is elastically rotatably installed below the fixed plate 15. The movable cylinder 16 and the shaft of the hopper roller 3 are connected by a transmission assembly. The transmission assembly drives the movable cylinder 16 to rotate back and forth. A lifting piston plate 18 is elastically lifted and lowered on the inner side of the movable cylinder 16. An elastic rubber part 19 is sealed and fixedly connected between the lifting piston plate 18 and the fixed plate 15. When the elastic rubber part 19 twists and recovers, the waste liquid in the purified hopper 1201 is recovered through the return assembly.

[0021] The dampening roller assembly includes a water-applying roller 7, a water-spreading roller 8, an intermediate roller 9, a first inking roller 10, and a printing plate cylinder 11, all rotatably mounted on the frame 1. The water-applying roller 7 is attached to the outer side of the metering roller 6, and the water-spreading roller 8 and the intermediate roller 9 are respectively attached to the outer side of the water-applying roller 7. The first inking roller 10 is attached to the outer side of the intermediate roller 9. The outer sides of the water-applying roller 7 and the first inking roller 10 are in contact with the printing plate cylinder 11. The transmission assembly includes a drive shaft 13 rotatably mounted on the frame 1. The water hopper 12 and the water drum 13 are connected by a transmission belt. An incomplete gear 14 is rotatably connected to the lower end of the water drum 12. The shaft of the incomplete gear 14 is connected to the transmission shaft 13 via a bevel gear assembly. A gear ring 17 is fixedly installed on the outer side of the movable cylinder 16, and the incomplete gear 14 and gear ring 17 mesh together, driving the movable cylinder 16 to rotate reciprocally. The lifting piston plate 18 is sealed and slidably connected to the inner side of the movable cylinder 16. A guide rod 1801 is fixedly installed on the inner side of the movable cylinder 16, and the guide rod 1801 slides through the lifting piston plate 18. A spring is fixedly connected between the movable cylinder 16 and the lifting piston plate 18. The elastic rubber part 19 has a cylindrical structure. During the rotation of the movable cylinder 16, the guide rod 1801 drives the lifting piston plate 18 to rotate synchronously. During the rotation of the lifting piston plate 18, it cooperates with the fixed plate 15 to twist the elastic rubber part 19. The return assembly includes a suction pipe 2 fixedly connected between the dividing hopper 1201 and the fixed plate 15. 0, and a purification cylinder 21 is fixedly connected to the middle position of the lifting piston plate 18. The purification cylinder 21 is sealed and installed at the lower end of the movable cylinder 16. A filter membrane 22 is installed on the purification cylinder 21. At the same time, a return pipe 23 is rotatably connected to the purification cylinder 21. Both the suction pipe 20 and the return pipe 23 are equipped with a one-way valve structure. The upper end of the return pipe 23 is connected to a drain pipe 24. The opening of the drain pipe 24 faces the water tank 12. At the same time, the drain pipe 24 is fixedly installed on the outside of the water tank 12.

[0022] The control cylinder 5 pushes the water-based adhesive foot 4 to rotate, so that the metering roller 6 connected to the water-based adhesive foot 4 is in contact with the outside of the water-applying roller 7. At the same time, the motor 2 is started, so that the motor 2 drives the water-spraying roller 3 to rotate. Simultaneously, the water-spraying roller 3 drives the metering roller 6 to rotate through the transmission gear, so that the water-spraying roller 3 can transfer the alcohol dampening solution in the water-spraying basin 12 to the metering roller 6. Then, the dampening solution is evenly transferred to the blank area of ​​the printing plate cylinder 11 through the water-applying roller 7. The water-spraying roller 8 can further grind and homogenize the dampening solution to avoid uneven local liquid volume. The first inking roller 10 can transfer the ink to the printing area of ​​the printing plate cylinder 11.

[0023] As the water drum roller 3 rotates, it drives the incomplete gear 14 to rotate via the transmission shaft 13 and bevel gear assembly. The incomplete gear 14 drives the gear ring 17 and the movable cylinder 16 to rotate reciprocally through meshing. This causes the movable cylinder 16 to drive the lower end of the elastic rubber part 19 to rotate synchronously. In turn, it works with the fixed plate 15 to twist the elastic rubber part 19, causing the space inside the elastic rubber part 19 to be adjusted back and forth. The damping solution collected in the hopper 1201 can be drawn out through the suction pipe 20. When the elastic rubber part 19 is twisted, the recovered damping solution is pressurized and filtered. After being quickly filtered through the filter membrane 22, the damping solution flows back to the water drum 12 through the return pipe 23 and the drain pipe 24, realizing recycling.

[0024] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Existing alcohol-based dampening printing presses are inconvenient for recovering and reusing alcohol gas. To further solve this technical problem, this example discloses the following technical content: Figures 6-8 As shown; the inner side of the movable cylinder 16 is provided with a condensing component for absorbing and condensing alcohol, and the inner side of the water tank 12 is provided with a movable floating cover component.

[0025] The condensation assembly includes a condenser tube 25 fixedly mounted on the lifting piston plate 18, the condenser tube 25 being spirally arranged, and the lower end of the condenser tube 25 communicating with the space below the lifting piston plate 18. A delivery tube 27 connects the lower space of the movable cylinder 16 and the upper space of the lifting piston plate 18. Hollow air passages 1202 are provided on the water tank 12 and the dividing tank 1201, and a suction pipe 26 connects the hollow air passage 1202 and the upper end of the condenser tube 25. Both the suction pipe 26 and the delivery tube 27 are equipped with one-way valve structures. The movable cylinder 16 and the elastic rubber... Coolant is filled between the parts 19, and the space between the movable cylinder 16 and the elastic rubber part 19 is connected to an external refrigeration device through a circulating cooling pipe 28. A one-way valve is provided on the circulating cooling pipe 28. The coolant is circulated and transported during the twisting and recovery process of the elastic rubber part 19. The movable floating cover assembly includes a float 29 that is lifted and installed inside the water bucket 12. A cover plate 30 is installed on the float 29 with elastic extension and retraction. A pull rope 31 is fixedly connected between the end of the cover plate 30 away from the water bucket roller 3 and the bottom of the inner side of the water bucket 12. At the same time, the cover plate 30 and the outer wall of the water bucket roller 3 are fitted with a clearance.

[0026] As the elastic component 19 reciprocates and recovers, it drives the lifting piston plate 18 to move up and down synchronously, thereby adjusting the air pressure between the lifting piston plate 18 and the lower part of the movable cylinder 16. This causes the condenser tube 25 to extract the heated and volatilized alcohol gas through the suction pipe 26 and the cavity air passage 1202 on the water tank 12 and the dividing hopper 1201. The alcohol gas in the condenser tube 25 exchanges heat with the coolant inside the movable cylinder 16 and condenses. Then, it enters the lower inner part of the movable cylinder 16 through the lower end of the condenser tube 25. As the lifting piston plate 18 moves down, the liquid delivery pipe 27 draws the condensed alcohol liquid into the inner part of the elastic component 19 and mixes it with the recovered dampening solution. As the elastic component 19 reciprocates and recovers, the space between it and the movable cylinder 16 changes repeatedly, causing the space between the movable cylinder 16 and the elastic component 19 to circulate coolant through the circulating cooling pipe 28, thereby achieving rapid cooling and condensation of the alcohol gas in the condenser tube 25.

[0027] Meanwhile, the float plate 29 and the cover plate 30 can cover the surface of the dampening solution in the water tank 12 and reduce the gap between the water tank 12 and the water tank roller 3, thereby effectively reducing the evaporation of alcohol components in the dampening solution. When the liquid level inside the water tank 12 changes, the cover plate 30 will automatically adjust under the pull of the pull rope 31 to ensure that a suitable distance is maintained between it and the water tank roller 3, which reduces the evaporation rate and ensures the normal transmission of the dampening solution.

[0028] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fountain solution backflow purification type alcohol fountain printing machine, comprising a rack (1), and a motor (2) is fixedly installed on the right side of the rack (1), a water bucket roller (3) is rotatably installed on the rack (1), and the shaft end of the water bucket roller (3) is fixedly connected with the output end of the motor (2); characterized in that A water glue foot (4) is rotatably installed on the outer side of the shaft part of the water bucket roller (3), an air cylinder (5) is rotatably installed on the rack (1), the output end of the air cylinder (5) is rotatably connected with the lower end of the water glue foot (4), a metering roller (6) is rotatably installed on the water glue foot (4), the metering roller (6) and the output end of the water bucket roller (3) are drivingly connected through a transmission gear set, a fountain roller set is further arranged on the rack (1), a water bucket (12) is further fixedly installed on the rack (1), a distribution bucket (1201) is fixedly installed on the outer side of the water bucket (12), a fixed plate (15) is fixedly installed below the water bucket (12), an active cylinder (16) is elastically rotatably installed below the fixed plate (15), the active cylinder (16) and the shaft part of the water bucket roller (3) are connected through a transmission assembly, meanwhile the transmission assembly drives the active cylinder (16) to reciprocatingly rotate, a lifting piston piece (18) is elastically liftably installed on the inner side of the active cylinder (16), the lifting piston piece (18) and the fixed plate (15) are sealingly and fixedly connected with an elastic rubber piece (19), and when the elastic rubber piece (19) is twisted and restored, the waste liquid in the distribution bucket (1201) is recovered through a backflow assembly, a condensing assembly for absorbing and condensing alcohol is arranged on the inner side of the active cylinder (16), and an active floating cover assembly is arranged on the inner side of the water bucket (12).

2. A fountain solution recirculating and purifying type alcohol-based fountain printing machine according to claim 1, characterized in that: The fountain roller set comprises a water applying roller (7), a water stringing roller (8), an intermediate roller (9), a first ink applying roller (10) and a plate cylinder (11) which are rotatably installed on the rack (1), the water applying roller (7) is attached to the outer side of the metering roller (6), the water stringing roller (8) and the intermediate roller (9) are respectively attached to the outer side of the water applying roller (7), the first ink applying roller (10) is attached to the outer side of the intermediate roller (9), and the outer sides of the water applying roller (7) and the first ink applying roller (10) are attached to the plate cylinder (11).

3. The purified alcohol dampening station printing machine with backflow of dampening solution according to claim 1, characterized in that: The transmission assembly comprises a transmission shaft (13) which is rotatably installed on the rack (1), the transmission shaft (13) and the shaft part of the water bucket roller (3) are drivingly connected through a transmission belt, an incomplete gear (14) is further rotatably connected with the lower end of the water bucket (12), the shaft part of the incomplete gear (14) and the transmission shaft (13) are drivingly connected through a bevel gear assembly, a tooth ring (17) is fixedly installed on the outer side of the active cylinder (16), the incomplete gear (14) and the tooth ring (17) are meshingly connected to drive the active cylinder (16) to reciprocatingly rotate.

4. A fountain solution recirculating and purifying type alcohol-based lithographic printing machine according to claim 1, characterized in that: The lifting piston piece (18) is sealingly and slidingly connected on the inner side of the active cylinder (16), a guide rod (1801) is fixedly installed on the inner side of the active cylinder (16), the guide rod (1801) slidingly penetrates through the lifting piston piece (18), and a spring is fixedly connected between the active cylinder (16) and the lifting piston piece (18).

5. A fountain solution recirculating purified spirit dampening printing machine according to claim 4, characterized in that: The elastic rubber piece (19) is arranged in a cylindrical structure, and the lifting piston piece (18) is driven to rotate synchronously by the guide rod (1801) during the rotation of the movable cylinder (16), and the lifting piston piece (18) is twisted by the fixed plate (15) during the rotation.

6. A fountain solution recirculating and purifying type alcohol-based lithographic printing machine according to claim 1, wherein: The backflow assembly comprises a liquid suction pipe (20) fixedly connected between the bucket (1201) and the fixed plate (15), and the middle position of the lifting piston piece (18) is fixedly connected with a purification cylinder (21) which is sealingly penetrated through the lifting installation of the lower end of the movable cylinder (16), and the purification cylinder (21) is provided with a filter membrane (22) and a backflow pipe (23) which is rotatably connected to the purification cylinder (21), and the liquid suction pipe (20) and the backflow pipe (23) are provided with one-way valve structures, and the upper end of the backflow pipe (23) is connected with a liquid discharge pipe (24) which is fixedly installed outside the water bucket (12).

7. A fountain solution recirculating purified spirit dampening printing machine according to claim 1, characterized in that: The condensing assembly comprises a condensing pipe (25) fixedly installed on the lifting piston piece (18), and the condensing pipe (25) is arranged in a spiral shape, and the lower end of the condensing pipe (25) is in communication with the space below the lifting piston piece (18), and the space above the lifting piston piece (18) and the lower space of the movable cylinder (16) are connected with a liquid delivery pipe (27), and the water bucket (12) and the bucket (1201) are provided with a cavity air channel (1202), and the cavity air channel (1202) and the upper end of the condensing pipe (25) are connected with an air suction pipe (26), and the air suction pipe (26) and the liquid delivery pipe (27) are provided with one-way valve structures.

8. A fountain solution recirculating purified spirit dampening printing machine according to claim 1, characterized in that: The movable cylinder (16) and the elastic rubber piece (19) are filled with cooling liquid, and the space between the movable cylinder (16) and the elastic rubber piece (19) is connected with an external refrigeration device through a circulating cold pipe (28), and the circulating cold pipe (28) is provided with a one-way valve, and the cooling liquid is circulated during the twisting and restoring of the elastic rubber piece (19).

9. A fountain solution recirculating purified spirit dampening printing machine according to claim 1, characterized in that: The movable floating cover assembly comprises a floating plate (29) which is liftingly installed on the inner side of the water bucket (12), and the floating plate (29) is elastically and telescopically provided with a cover plate (30), and the cover plate (30) is fixedly connected with a pull rope (31) between the end away from the water bucket roller (3) and the inner bottom of the water bucket (12), and the cover plate (30) and the outer wall of the water bucket roller (3) are gap-fitted.

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