Water-based ink printing machine

Abstract

The invention relates to a water-based ink printing machine which comprises a rack, an ink fountain, a printing roller and a pressing roller are arranged on the rack, an ink delivery roller is arranged on the ink fountain, the printing roller is attached to the ink delivery roller, a filtering pipe and a scraping piece are arranged in the ink fountain, a filtering assembly is arranged on one side of the rack and comprises a filtering cylinder and a filtering piece, and the filtering cylinder is connected with the ink fountain; the filter part is arranged in the filter cartridge, a circulating pump is arranged on one side of the filter cartridge, a return pipe on one side of the circulating pump is located at the ink fountain, a rotating frame is arranged on the rack, and an ink scraping part and a cleaning part are arranged on the two sides of the rotating frame respectively; a printed matter passes through the printing roller, ink is brought to the printing roller through the ink delivery roller, the ink scraping piece scrapes the printing roller, the printing roller rotates for printing, the scraping piece scrapes the ink in the ink fountain, and the ink is filtered through the filtering pipe, conveyed to the filtering cylinder to be filtered and conveyed back to the ink fountain through the circulating pump. The printing device has a good printing effect.

Description

Technical Field

[0001] The present application relates to the field of printing equipment, and in particular to a water-based ink printing machine. Background Art

[0002] Water-based ink is a uniform paste composed of binders, pigments, additives and other substances. The binder provides the necessary transfer properties for the ink, and the pigment gives the ink its color. Water-based ink is mainly printed on a printing press.

[0003] In the related technology, reference can be made to the utility model patent with authorization announcement number CN205167874U, which discloses a printing machine, including a printing system and an ink supply system, the ink supply system including an ink tank and an ink pumping device, and a first pipe connected therebetween, the ink supply system also includes an ink storage tank connected to the ink pumping device through a second pipe, two liquid level sensors for detecting the water level in the ink storage tank are provided in the ink storage tank, and an ink outlet pipe for discharging ink to the printing machine is provided at the bottom of the ink storage tank, so that the ink fountain can be continuously filled with ink while ensuring the best printing effect.

[0004] Impurities are easily retained in the ink fountain during printing. After the ink in the ink fountain has been used for a period of time, it is easy for precipitation to occur, the ink composition to change, and part of the ink to adhere to the printing roller and solidify, which ultimately leads to poor printing results. Summary of the invention

[0005] In order to solve the problems of impurities and precipitation in the ink, changes in ink components, and part of the ink adhering to the printing roller and solidifying, resulting in poor printing effect, the present application provides a water-based ink printing machine.

[0006] The present application provides a water-based ink printing machine adopting the following technical solution: A water-based ink printing machine comprises a frame, an ink fountain, a printing roller and a pressure roller are arranged on the frame, the ink fountain is arranged on the frame, an ink delivery roller is rotatably mounted on the ink fountain, the printing roller is arranged on the upper side of the ink fountain and is in contact with one side of the ink delivery roller, a first motor for driving the printing roller to rotate is arranged on the frame, the pressure roller is arranged on the frame and is located on the upper side of the printing roller, a filter tube is arranged in the ink fountain, a scraper is arranged in the ink fountain, a filter assembly is arranged on one side of the frame, the filter assembly comprises a filter cartridge and a filter element, the filter cartridge is connected to the ink fountain at a lower feeding port, the filter element is arranged in the filter cartridge, a circulating pump is arranged on one side of the filter cartridge, a return pipe is arranged on one side of the circulating pump, one end of the return pipe is located at the ink fountain, a rotating frame is arranged on the frame, an ink scraper and a cleaning element are arranged on both sides of the rotating frame, and one side of the ink scraper is in contact with one side of the printing roller.

[0007] By adopting the above technical scheme, the printed matter passes between the pressing roller and the printing roller, the ink transfer roller brings the ink in the ink fountain to the printing roller, the ink scraper scrapes off the excess ink on the printing roller, the printing roller rotates to print the printed matter, the scraper scrapes the ink in the ink fountain to reduce the amount of sediment in the ink fountain, the ink in the ink fountain is filtered by the filter tube, transported to the filter cylinder, filtered by the filter element of the filter cylinder, and transported back to the ink fountain by the circulation pump through the return pipe. There are fewer impurities in the ink in the ink fountain, and the rotating frame rotates to drive the cleaning element to clean the printing roller. It is not easy to leave solidified ink on the printing roller, and the printing effect is better.

[0008] Optionally, the scraper includes a scraper, which is slidably mounted on the ink fountain, and the scraper is in contact with both side walls of the ink fountain. The scraper is provided with bristles on the downward side, and the bristles are in contact with the side walls of the filter tube.

[0009] By adopting the above technical solution, the scraper scrapes the ink in the ink fountain when it slides, and at the same time scrapes off the agglomerated ink adhering to the side wall of the ink fountain, and transports and filters it through the filter tube. When the scraper moves, the bristles on the lower side of the scraper clean the side wall of the filter tube, reducing the probability of clogging of the filter tube.

[0010] Optionally, a reciprocating screw is rotatably mounted on the frame, the scraper is threadedly connected to the reciprocating screw, a guide rod is provided on the frame, the scraper is slidably connected to the guide rod, a driving mechanism is provided on one side of the frame, and the reciprocating screw is connected to the driving mechanism.

[0011] By adopting the above technical solution, the driving mechanism drives the reciprocating screw to rotate, the reciprocating screw drives the scraper to slide back and forth in the ink fountain, the guide rod guides the movement of the scraper, and the operation of driving the scraper is more convenient.

[0012] Optionally, the driving mechanism includes a driving motor and a first driving wheel, the driving motor is arranged on the frame, the first driving wheel is connected to the ink delivery roller and is coaxially arranged, the first driving wheel is connected to the output shaft of the driving motor, a second driving wheel is coaxially arranged at one end of the reciprocating screw, and the second driving wheel is connected to the first driving wheel through a first belt.

[0013] By adopting the above technical solution, the driving motor drives the first driving wheel to rotate, the first driving wheel drives the grinding roller to rotate, and the second driving wheel is driven by the first belt to drive the reciprocating screw to rotate. The operation of driving the reciprocating screw to rotate is more convenient.

[0014] Optionally, the filter tube is rotatably mounted on the ink fountain, a third driving wheel is coaxially arranged at one end of the filter tube, and the third driving wheel is connected to the first driving wheel via a second belt.

[0015] By adopting the above technical solution, when the first driving wheel rotates, it drives the third driving wheel to rotate and then drives the filter tube to rotate. The filter tube rotates to filter, thereby reducing the probability of impurities accumulating in the ink fountain.

[0016] Optionally, the scraper member includes a scraper plate and a guide plate, the rotating frame is rotatably mounted on the frame, the scraper plate is arranged on one side of the rotating frame, the guide plate is arranged on one side of the scraper plate, and one side of the scraper plate is in contact with the circumferential side wall of the printing roller.

[0017] By adopting the above technical solution, when the printing roller rotates, one side of the scraper scrapes off the excess ink on the printing roller and flows back to the ink fountain along the guide plate, thereby reducing the problem of poor printing effect caused by excessive ink during printing.

[0018] Optionally, the cleaning member comprises a cleaning roller, the cleaning roller is rotatably mounted on the rotating frame, bristles are provided on the cleaning roller, and a locking member for limiting the rotating frame is provided on the frame.

[0019] By adopting the above technical solution, when it is necessary to clean the coagulated ink adhering to the printing roller, the rotating frame drives the cleaning roller to rotate to one side of the printing roller, and the locking piece is locked. When the printing roller rotates, the bristles on the cleaning roller clean the circumferential side wall of the printing roller, and the cleaning operation of the printing roller is more convenient.

[0020] Optionally, the locking member includes a push rod and a spring, the spring is arranged on the frame, the push rod is slidably installed on the frame and connected to one end of the spring, a rotating disk is arranged on one side of the rotating frame, and a limiting groove is arranged on the rotating disk for inserting one end of the push rod.

[0021] By adopting the above technical solution, the rotating disk drives the rotating frame to rotate. When it rotates to the position where the limit groove is located at the position of the push rod, the spring pushes the push rod to be inserted into the limit groove of the rotating disk to limit the rotating disk. At this time, the position of the rotating frame is fixed, and the operation of locking the rotating frame is simple and quick.

[0022] Optionally, the filter element includes a first filter sleeve and a second filter sleeve, the first filter sleeve is rotatably mounted on the filter sleeve, the second filter sleeve is rotatably mounted in the filter sleeve and is located outside the first filter sleeve, and the filter sleeve is provided with a rotating member for driving the first filter sleeve and the second filter sleeve to rotate.

[0023] By adopting the above technical solution, the ink is filtered in the first filter sleeve and then filtered by the second filter sleeve. The filtered ink is transported back to the ink fountain for recycling. The first filter sleeve and the second filter sleeve rotate in opposite directions, driving the ink to move to the outside of the two filter sleeves, and the filtering effect is better.

[0024] Optionally, the rotating part includes a rotating motor and a gear, a first gear ring is rotatably mounted on the filter cartridge, the first filter sleeve is connected to the first gear ring, a second gear ring is rotatably mounted on the filter cartridge, the second filter sleeve is connected to the second gear ring, the gear is rotatably mounted on the filter cartridge and the two sides of the gear are respectively meshed with the first gear ring and the second gear ring, the rotating motor is arranged on the filter cartridge, and the gear is connected to the output shaft of the rotating motor.

[0025] By adopting the above technical solution, the rotating motor drives the gear to rotate, thereby driving the first gear ring and the second gear ring to rotate in the opposite direction, and at the same time drives the first filter sleeve and the second filter sleeve to rotate, so the driving operation is more convenient.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The printed matter passes between the pressing roller and the printing roller, the ink transfer roller brings the ink in the ink fountain to the printing roller, the ink scraper scrapes off the excess ink on the printing roller, the printing roller rotates to print the printed matter, the scraper scrapes the ink in the ink fountain to reduce the amount of sediment in the ink fountain, the ink in the ink fountain is filtered by the filter tube, transported to the filter cylinder, filtered by the filter element of the filter cylinder, and transported back to the ink fountain by the circulation pump through the return pipe. There are fewer impurities in the ink in the ink fountain, and the rotating frame rotates to drive the cleaning element to clean the printing roller. It is not easy to leave solidified ink on the printing roller, and the printing effect is better; 2. The rotating frame drives the cleaning roller to rotate to one side of the printing roller, and the locking piece is locked. When the printing roller rotates, the bristles on the cleaning roller clean the circumferential side wall of the printing roller, and the cleaning operation of the printing roller is more convenient; 3. After the ink is filtered in the first filter sleeve, it is filtered again by the second filter sleeve. The filtered ink is transported back to the ink fountain for recycling. The first filter sleeve and the second filter sleeve rotate in opposite directions, driving the ink to move to the outside of the two filter sleeves, and the filtering effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of this application.

[0028] Figure 2 It is a three-dimensional structural schematic diagram of one side of the circulation component of the present application.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the present application along the vertical direction of the frame.

[0030] Figure 4 It is a schematic diagram of the enlarged three-dimensional structure of part A of the present application.

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the rotating disk and the locking member of the present application.

[0032] Figure 6 It is a cross-sectional schematic diagram of the filter cartridge of the present application.

[0033] Figure 7 It is a schematic diagram of the enlarged three-dimensional structure of part B of this application.

[0034] Those skilled in the art will appreciate that elements in the drawings are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be exaggerated relative to other elements to help improve understanding of embodiments of the present invention.

[0035] Reference numerals: 1, frame; 11, ink fountain; 111, ink transfer roller; 112, filter tube; 113, feed tube; 12, printing roller; 13, pressure roller; 14, first motor; 15, circulation pump; 151, return tube; 16, rotating frame; 161, rotating disk; 1611, limit groove; 17, reciprocating screw rod; 18, guide rod; 19, vertical bracket; 191, sliding groove; 2, scraper; 21, scraper; 211, brush; 3, filter cartridge; 4, filter element; 41, The first filter sleeve; 42, the second filter sleeve; 5, the ink scraper; 51, the ink scraper plate; 52, the guide plate; 6, the cleaning member; 61, the cleaning roller; 7, the driving mechanism; 71, the driving motor; 72, the first driving wheel; 73, the second driving wheel; 74, the first belt; 75, the third driving wheel; 76, the second belt connection; 8, the locking member; 81, the push rod; 82, the spring; 9, the rotating member; 91, the rotating motor; 92, the gear; 93, the first gear ring; 94, the second gear ring. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings.

[0037] The present application embodiment discloses a water-based ink printing machine, referring to Figure 1 and Figure 2 , including a frame 1, on which an ink fountain 11, a printing roller 12 and a pressure roller 13 are arranged, the pressure roller 13 and the printing roller 12 are both rotatably mounted on the frame 1 and are parallel to each other, the pressure roller 13 is located at the upper side of the printing roller 12, the ink fountain 11 is arranged at the lower side of the printing roller 12, an ink transfer roller 111 is rotatably mounted in the ink fountain 11, the ink transfer roller 111 and the printing roller 12 are parallel to each other, and the circumferential side walls of the printing roller 12 and the ink transfer roller 111 are in contact, and a first motor 14 is arranged on the frame 1, and the first motor 14 drives the printing roller 12 to rotate. During printing, the ink transfer roller 111 brings the ink in the ink fountain 11 to the printing roller 12, and the printed product passes between the pressure roller 13 and the printing roller 12 for printing.

[0038] Reference Figure 2 and Figure 3 , a filter tube 112 is installed in the ink fountain 11 on the lower side, and a plurality of filter holes are arranged on the filter tube 112. The filter tube 112 filters some impurities in the ink fountain 11. A scraper 2 is arranged in the ink fountain 11, and the scraper 2 scrapes the ink in the ink fountain 11 to reduce the amount of sediment in the ink fountain 11. A filter assembly is arranged on one side of the frame 1, and the filter assembly includes a filter cartridge 3 and a filter element 4. The ink fountain 11 is connected to a feed pipe 113 at the lower feed port, and one end of the feed pipe 113 is connected to a circulation pump 15. The circulation pump 15 is connected to the top of the filter cartridge 3 through a water pipe. The filter element 4 is arranged in the filter cartridge 3, and a circulation pump 15 is arranged on one side of the filter cartridge 3. A return pipe 151 is arranged on one side of the circulation pump 15, and one end of the return pipe 151 is located on the upper side of the ink fountain 11. A rotating frame 16 is arranged on the frame 1, and an ink scraper 5 and a cleaning member 6 are arranged on both sides of the rotating frame 16, and one side of the ink scraper 5 is attached to one side of the printing roller 12. The ink scraper 5 scrapes off the excess ink on the printing roller 12. The ink in the ink fountain 11 is filtered through the filter tube 112 and then transported to the filter cartridge 3. It is filtered through the filter element 4 of the filter cartridge 3 and then transported back to the ink fountain 11 by the circulation pump 15 through the return pipe 151. There are fewer impurities in the ink in the ink fountain 11. The rotating frame 16 rotates to drive the cleaning component 6 to clean the printing roller 12. It is not easy for solidified ink to remain on the printing roller 12, and the printing effect is better.

[0039] Reference Figure 3 The scraper 2 includes a scraper 21, which is slidably mounted on the ink fountain 11 along the length direction of the ink fountain 11, and the scraper 21 is in contact with the two opposite inner side walls of the ink fountain 11. The scraper 21 is provided with bristles 211 on the downward side, and the bristles 211 are in contact with the side wall of the filter tube 112. When the scraper 21 slides, the ink in the ink fountain 11 is scraped off, and the agglomerated ink adhering to the side wall of the ink fountain 11 is scraped off, and the ink is transported and filtered through the filter tube 112. When the scraper 21 moves, the bristles 211 on the lower side of the scraper 21 clean the side wall of the filter tube 112, thereby reducing the probability of blockage of the filter tube 112.

[0040] Reference Figure 3 A reciprocating screw rod 17 is rotatably mounted on the frame 1, the reciprocating screw rod 17 and the ink fountain 11 are arranged parallel to each other, one end of the scraper 21 is threadedly connected to the reciprocating screw rod 17, a guide rod 18 is arranged on the frame 1, the guide rod 18 and the reciprocating screw rod 17 are arranged parallel to each other, one end of the scraper 21 is slidably connected to the guide rod 18, the reciprocating screw rod 17 drives the scraper 21 to slide back and forth in the ink fountain 11, and the guide rod 18 guides the movement of the scraper 21.

[0041] Reference Figure 4A driving mechanism 7 is provided on one side of the frame 1. The driving mechanism 7 includes a driving motor 71 and a first driving wheel 72. The driving motor 71 is provided on the frame 1. The first driving wheel 72 is connected to the ink delivery roller 111 and is coaxially provided. The first driving wheel 72 is connected to the output shaft of the driving motor 71. A second driving wheel 73 is coaxially provided at one end of the reciprocating screw rod 17. The second driving wheel 73 is connected to the first driving wheel 72 through a first belt 74. The driving motor 71 drives the first driving wheel 72 to rotate, and the first driving wheel 72 drives the ink delivery roller to rotate, and drives the second driving wheel 73 through the first belt 74, and then drives the reciprocating screw rod 17 to rotate.

[0042] Reference Figure 4 A third driving wheel 75 is coaxially arranged at one end of the filter tube 112, and the third driving wheel 75 is connected to the first driving wheel 72 via a second belt 76. When the first driving wheel 72 rotates, the third driving wheel 75 is driven to rotate and then the filter tube 112 is driven to rotate, and the filter tube 112 rotates for filtering.

[0043] Reference Figure 3 and Figure 5 The ink scraping member 5 includes an ink scraping plate 51 and a guide plate 52. A vertical bracket 19 is provided on the frame 1. The rotating frame 16 is rotatably mounted on the vertical bracket 19. A rotating disk 161 is provided on one side of the rotating frame 16. The rotating disk 161 is located on the side of the vertical bracket 19 away from the rotating frame 16. The ink scraping plate 51 is provided on one side of the rotating frame 16. The ink scraping plate 51 is distributed along the length direction of the printing roller 12. The guide plate 52 is provided on one side of the ink scraping plate 51. One side of the ink scraping plate 51 is in contact with the circumferential side wall of the printing roller 12. When the printing roller 12 rotates, one side of the ink scraping plate 51 scrapes off the excess ink on the printing roller 12, and flows back to the ink fountain 11 along the guide plate 52.

[0044] Reference Figure 5 The cleaning member 6 includes a cleaning roller 61, which is rotatably mounted on the side of the rotating frame 16 away from the ink scraper 51. Bristles 211 are arranged on the circumferential side wall of the cleaning roller 61. When it is necessary to clean the coagulated ink adhering to the printing roller 12, the rotating frame 16 drives the cleaning roller 61 to rotate to one side of the printing roller 12. The printing roller 12 rotates, and the bristles 211 on the cleaning roller 61 clean the circumferential side wall of the printing roller 12.

[0045] Reference Figure 5The locking member 8 is provided on the vertical bracket 19, and the locking member 8 includes a push rod 81 and a spring 82. The vertical bracket 19 is provided with a sliding groove 191, and the push rod 81 is slidably installed at the sliding groove 191. The spring 82 is provided at the sliding groove 191 of the vertical bracket 19. One end of the push rod 81 is connected to one end of the spring 82. A limiting groove 1611 is provided on the rotating disk 161, and two limiting grooves 1611 are provided. The rotating disk 161 is rotated to drive the rotating frame 16 to rotate. When the limiting groove 1611 is located at the position of the push rod 81, the spring 82 pushes the push rod 81 to be inserted into the limiting groove 1611 of the rotating disk 161, and the rotating disk 161 is limited. At this time, the position of the rotating frame 16 is fixed, and the rotating frame 16 is locked.

[0046] Reference Figure 6 The filter element 4 includes a first filter sleeve 41 and a second filter sleeve 42. The first filter sleeve 41 is rotatably mounted on the filter sleeve 3, and the second filter sleeve 42 is rotatably mounted in the filter sleeve 3 and is located outside the first filter sleeve 41. The first filter sleeve 41 and the second filter sleeve 42 are both provided with filter holes, and the filter holes on the first filter sleeve 41 are larger than the filter holes on the second filter sleeve 42. After the ink enters the first filter sleeve 41 through the water pipe and is filtered, it is filtered by the second filter sleeve 42, and the filtered ink is transported back to the ink fountain 11 for recycling.

[0047] Reference Figure 6 and Figure 7 , a rotating member 9 is arranged on the top of the filter cartridge 3, and the rotating member 9 includes a rotating motor 91 and a gear 92. A first gear ring 93 is rotatably mounted on the filter cartridge 3, and the top of the first filter sleeve 41 is connected to the first gear ring 93. A second gear ring 94 is rotatably mounted on the filter cartridge 3, and the top of the second filter sleeve 42 is connected to the second gear ring 94. The gear 92 is rotatably mounted on the filter cartridge 3, and the two sides of the gear 92 are respectively meshed with one side of the first gear ring 93 and one side of the second gear ring 94. The rotating motor 91 is arranged on the filter cartridge 3, and the gear 92 is connected to the output shaft of the rotating motor 91. The rotating motor 91 drives the gear 92 to rotate, thereby driving the first gear ring 93 and the second gear ring 94 to rotate in the opposite direction, and at the same time drives the first filter sleeve 41 and the second filter sleeve 42 to rotate. The first filter sleeve 41 and the second filter sleeve 42 rotate in the opposite direction, driving the ink to move to the outside of the two filter sleeves, and the filtering effect is better.

[0048] The implementation principle of a water-based ink printing machine in the embodiment of the present application is as follows: the printed matter passes between the pressure roller 13 and the printing roller 12, the ink transfer roller 111 brings the ink in the ink fountain 11 out to the printing roller 12, the ink scraper 51 scrapes off the excess ink on the printing roller 12, the printing roller 12 rotates to print the printed matter, the scraper 21 scrapes the ink in the ink fountain 11 to reduce the amount of sediment in the ink fountain 11, the ink in the ink fountain 11 is filtered by the filter tube 112, and then transported to the filter cylinder 3, filtered by the first filter sleeve 41 and the second filter sleeve 42 of the filter cylinder 3, and then transported back to the ink fountain 11 by the circulating pump 15 through the return pipe 151. The ink in the ink fountain 11 contains less impurities, and the rotating frame 16 rotates to drive the cleaning roller 61 to clean the printing roller 12. It is not easy for solidified ink to remain on the printing roller 12, and the printing effect is better.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A water-based ink printing machine, comprising a frame (1), the frame (1) being provided with an ink fountain (11), a printing roller (12) and a pressure roller (13), the ink fountain (11) being provided on the frame (1), an ink transfer roller (111) being rotatably mounted on the ink fountain (11), the printing roller (12) being provided on the upper side of the ink fountain (11) and being in contact with one side of the ink transfer roller (111), the frame (1) being provided with a first motor (14) for driving the printing roller (12) to rotate, the pressure roller (13) being provided on the frame (1) and being located on the upper side of the printing roller (12), characterized in that: A filter tube (112) is arranged in the ink fountain (11), a scraper (2) is arranged in the ink fountain (11), a filter assembly is arranged on one side of the frame (1), the filter assembly comprises a filter cartridge (3) and a filter element (4), the filter cartridge (3) is connected to a feed opening of the ink fountain (11) at the lower side, the filter element (4) is arranged in the filter cartridge (3), a circulation pump (15) is arranged on one side of the filter cartridge (3), a return pipe (151) is arranged on one side of the circulation pump (15), one end of the return pipe (151) is located at the ink fountain (11), a rotating frame (16) is arranged on the frame (1), and an ink scraper (5) and a cleaning member (6) are arranged on both sides of the rotating frame (16), and one side of the ink scraper (5) is in contact with one side of the printing roller (12).

2. A water-based ink printer according to claim 1, characterized in that: The scraper (2) comprises a scraper (21), the scraper (21) being slidably mounted on the ink fountain (11), the scraper (21) being in contact with two side walls of the ink fountain (11), and bristles (211) being arranged on the downward side of the scraper (21), the bristles (211) being in contact with the side walls of the filter tube (112).

3. A water-based ink printer according to claim 2, characterized in that: A reciprocating screw (17) is rotatably mounted on the frame (1), the scraper (21) is threadedly connected to the reciprocating screw (17), a guide rod (18) is provided on the frame (1), the scraper (21) is slidably connected to the guide rod (18), a driving mechanism (7) is provided on one side of the frame (1), and the reciprocating screw (17) is connected to the driving mechanism (7).

4. A water-based ink printer according to claim 3, characterized in that: The driving mechanism (7) comprises a driving motor (71) and a first driving wheel (72), wherein the driving motor (71) is arranged on the frame (1), the first driving wheel (72) is connected to the ink delivery roller (111) and is coaxially arranged, the first driving wheel (72) is connected to the output shaft of the driving motor (71), a second driving wheel (73) is coaxially arranged at one end of the reciprocating screw rod (17), and the second driving wheel (73) is connected to the first driving wheel (72) via a first belt (74).

5. A water-based ink printer according to claim 4, characterized in that: The filter tube (112) is rotatably mounted on the ink fountain (11); a third drive wheel (75) is coaxially arranged at one end of the filter tube (112); the third drive wheel (75) is connected to the first drive wheel (72) via a second belt (76).

6. A water-based ink printer according to claim 1, characterized in that: The ink scraping member (5) comprises an ink scraping plate (51) and a guide plate (52); the rotating frame (16) is rotatably mounted on the frame (1); the ink scraping plate (51) is arranged on one side of the rotating frame (16); the guide plate (52) is arranged on one side of the ink scraping plate (51); and one side of the ink scraping plate (51) is in contact with the circumferential side wall of the printing roller (12).

7. The water-based ink printer according to claim 1, characterized in that: The cleaning member (6) comprises a cleaning roller (61), the cleaning roller (61) being rotatably mounted on the rotating frame (16), the cleaning roller (61) being provided with bristles (211), and the frame (1) being provided with a locking member (8) for limiting the position of the rotating frame (16).

8. A water-based ink printer according to claim 7, characterized in that: The locking member (8) comprises a push rod (81) and a spring (82), wherein the spring (82) is arranged on the frame (1), the push rod (81) is slidably mounted on the frame (1) and connected to one end of the spring (82), a rotating disk (161) is arranged on one side of the rotating frame (16), and a limiting groove (1611) is arranged on the rotating disk (161) for inserting one end of the push rod (81).

9. The water-based ink printer according to claim 1, characterized in that: The filter element (4) comprises a first filter sleeve (41) and a second filter sleeve (42); the first filter sleeve (41) is rotatably mounted on the filter sleeve (3); the second filter sleeve (42) is rotatably mounted inside the filter sleeve (3) and is located outside the first filter sleeve (41); and a rotating element (9) is provided on the filter sleeve (3) for driving the first filter sleeve (41) and the second filter sleeve (42) to rotate.

10. The water-based ink printer according to claim 9, characterized in that: The rotating member (9) comprises a rotating motor (91) and a gear (92); a first gear ring (93) is rotatably mounted on the filter cartridge (3); the first filter sleeve (41) is connected to the first gear ring (93); a second gear ring (94) is rotatably mounted on the filter cartridge (3); the second filter sleeve (42) is connected to the second gear ring (94); the gear (92) is rotatably mounted on the filter cartridge (3) and two sides of the gear (92) are respectively meshed with the first gear ring (93) and the second gear ring (94); the rotating motor (91) is arranged on the filter cartridge (3); and the gear (92) is connected to an output shaft of the rotating motor (91).

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