Packaging bag printing device

Abstract

The present invention relates to the technical field of packaging and printing equipment, and in particular to a packaging bag printing device. Through the cooperation between an arc-shaped limiting plate and a printing plate block, a traditional pattern groove engraved on a printing roller is separated into two parts, which is convenient for cleaning during the printing process. By causing relative sliding between the arc-shaped limiting plate and the printing plate block, the dried ink in the groove is pushed out, which is beneficial to improving the cleaning effect. When the printing plate block and the arc-shaped limiting plate slide relatively, the ink can be sprayed out through the injection hole, so that the ink appears from the bottom of the groove. The ink in the entire groove can be evenly replaced, and the phenomenon that the ink at the bottom of the traditional groove is prevented from always being retained, thereby improving the uniformity of the ink and being beneficial to improving the printing effect. The present invention has broad application prospects in the technical field of packaging and printing equipment.

Description

Technical Field

[0001] The invention relates to the technical field of packaging and printing equipment, in particular to a packaging bag printing device. Background Art

[0002] Gravure printing is the most commonly used printing method for packaging bags. The image and text part of the printing plate is concave, and the degree of concavity varies with the level of the image. The advantages of gravure printing are bright colors, high saturation, high plate printability, stable print quality, and fast printing speed. Therefore, it occupies an extremely important position in the fields of printing, packaging, and graphic publishing. During printing, ink is filled into the pits, and the ink on the surface of the printing plate is scraped off with a scraper. There is a certain pressure contact between the printing plate and the substrate, and the ink in the pits is transferred to the substrate to complete the printing.

[0003] At present, in the long-term gravure printing process of packaging bags, the transfer rate of ink from the cells on the printing plate to the surface of the substrate is usually about 50% to 70%, and about 30% to 50% of the ink always remains in the cells. The ink remaining in the cells will be partially dried due to certain factors, so that the ink may block the cells, resulting in the ink being unable to flow out smoothly, affecting the lines and color effects of the printed products. Over time, the cells are blocked more and more shallowly, and the ink transfer rate is getting lower and lower, and finally causing plate blocking failure. Therefore, the operators on the production line currently need to regularly clean or replace the gravure plate surface to maintain its good printing effect. If the phenomenon of ink blocking the cells is more serious, it is necessary to temporarily stop the machine and disassemble the entire printing plate for thorough cleaning. The re-disassembly process is cumbersome, which seriously affects the printing efficiency.

[0004] Therefore, there is an urgent need for a packaging bag printing device that can automatically clean the cells on the printing plate to solve the problems in the above-mentioned background technology. Summary of the invention

[0005] In order to solve the problems in the above background technology, a packaging bag printing device is invented.

[0006] The technical solution of the present invention is to include a mounting seat, wherein the bottom of the mounting seat is filled with ink, a rotatable printing plate shell is arranged in the mounting seat, a printing groove is provided on the printing plate shell, a plurality of arc-shaped limit plates which can be embedded in the printing groove are evenly distributed in the printing plate shell, the radius of the arc-shaped limit plates is equal to that of the printing plate shell, a pattern groove is provided on the arc-shaped limit plates, a rotatable rotating body is arranged in the middle of the printing plate shell, the rotating body includes a conversion chamber, a rotating chamber, an ink storage chamber, and a waste liquid chamber, the rotating chamber is located in the middle of the rotating body, the conversion chamber is located on the outside of the rotating chamber, the waste liquid chamber is located in the front side of the conversion chamber and is connected with the conversion chamber, and the front and rear sides of the rotating chamber are respectively It is set as an ink storage cavity, and an inkjet cavity corresponding to the arc-shaped limit plate is set in the printing plate shell, one end of the inkjet cavity is fixedly connected to the arc-shaped limit plate, a pump body is set in the inkjet cavity, one end of the pump body is inserted into the rotating cavity and communicated with the ink storage cavity, a plurality of slots are provided on the rotating cavity, a slidable sliding rod is provided in the slot, a printing plate block is provided at the upper end of each sliding rod, a pattern protrusion cooperating with the pattern slot is provided at the upper end of the printing plate block, a slot hole cooperating with the pattern protrusion is provided on the inkjet cavity, the printing plate block can slide in the slot hole, an injection hole is provided in the inkjet cavity, and the injection hole of the printing plate block can be communicated with the slot hole when the printing plate block slides.

[0007] Preferably, a limit block is provided on the rotating body, the limit block is provided with a first sliding groove, the limit block is provided with a sliding body that can slide in the first sliding groove, the upper and lower ends of the sliding body are respectively provided with electromagnets, the upper and lower ends of the limit block are respectively provided with metal bodies that can attract each other with the electromagnets on the corresponding sides, a sliding shell is provided on the sliding body, a fixed body is provided in the printing plate thin shell, a wedge-shaped groove is provided in the fixed body, an inclined surface is provided in the wedge groove, a wedge block located in the wedge groove is provided on the sliding shell, the wedge block can slide along the inclined surface, and the wedge block can extend out of the wedge groove when sliding on the inclined surface, and a limit rod corresponding to the wedge block on the corresponding side is provided on the inkjet cavity, and the wedge block can contact the limit rod when sliding in the wedge groove.

[0008] Preferably, a rotating cam is provided in the middle of the rotating chamber, a first motor is provided at one end of the rotating cam, the first motor is fixedly connected to the rotating body, and a contact wheel is provided at one end of each sliding rod close to the rotating cam, and the contact wheel is rollingly connected to the rotating cam.

[0009] Preferably, a third sliding groove is provided on the printing plate block, the upper end of the sliding rod is inserted into the third sliding groove and can slide in the third sliding groove, and a third compression spring is provided between the sliding rod and the printing plate block.

[0010] Preferably, a plurality of second compression springs are arranged between the inkjet cavity and the printing plate block, and the elastic coefficient of the second compression spring is much smaller than the elastic coefficient of the third compression spring.

[0011] Preferably, a second rotating shaft is provided in the mounting seat, a cleaning roller is provided on the second rotating shaft, a soft brush layer is provided on the surface of the cleaning roller, the soft brush layer can contact the thin layer of the printing plate, a second motor is provided on one side of the second rotating shaft, and the second motor is fixedly connected to the mounting seat.

[0012] Preferably, a driving motor is provided at one end of the printing plate shell, and the driving motor is fixedly connected to the mounting seat.

[0013] Preferably, a cleaning brush layer is provided inside the printing plate shell, and the cleaning brush layer can contact the surface of the printing plate block.

[0014] Preferably, a rotating handle is fixedly connected to one side of the rotating body, and the rotating handle is rotatably connected to the mounting seat.

[0015] Preferably, the mounting seat is provided with an ink scraper holder in contact with the printing plate shell, the upper end of the mounting seat is provided with a pressure roller, one end of the pressure roller is provided with a third motor, and the third motor is fixedly connected to the mounting seat.

[0016] The technical solution of the present invention can achieve the following beneficial effects:

[0017] (1) A printing groove, an arc-shaped limit plate, and a printing plate block are provided. Through the cooperation between the arc-shaped limit plate and the printing plate block, the conventional pattern groove engraved on the printing roller is separated into two parts, which is convenient for cleaning during the printing process. By causing relative sliding between the arc-shaped limit plate and the printing plate block, the dried ink in the groove is pushed out, which is beneficial to improving the cleaning effect;

[0018] (2) A cleaning roller and a soft brush layer are provided, and when the printing plate shell contacts the soft brush layer, the surface of the printing plate shell can be cleaned. At the same time, by adjusting the relative position height of the printing plate block and the arc-shaped limiting plate, the soft brush layer can clean the surfaces of the printing plate block and the arc-shaped limiting plate at the same time;

[0019] (3) A cleaning brush layer is provided. By providing a plurality of arc-shaped limit plates and printing plate blocks, when one set of arc-shaped limit plates and printing plate block components is working, the remaining arc-shaped limit plates and printing plate block kits can be selected as spares. By selecting the arc-shaped limit plates and printing blocks, they can be quickly switched. At the same time, under the action of the cleaning brush layer, the arc-shaped limit plates and printing plate block kits stored in the printing plate shell can be further cleaned, achieving a multiple cleaning effect;

[0020] (4) An inkjet housing, a pump body, and an ink storage chamber are provided. When the printing plate and the arc-shaped limiting plate slide relative to each other, the ink can be ejected through the ejection hole, so that the ink appears from the bottom of the groove, and the ink in the entire groove can be evenly replaced, thereby preventing the phenomenon that the ink at the bottom of the traditional groove is always retained, thereby improving the uniformity of the ink and facilitating the improvement of the printing effect;

[0021] The technical solution of the present invention has broad application prospects in the technical field of packaging and printing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an axonometric view of the present invention;

[0023] Figure 2 is a schematic diagram of a mounting seat and a connecting member thereof of the present invention;

[0024] Figure 3 It is a front view full cutaway view of the present invention;

[0025] Figure 4 It is a right side full cutaway view of the present invention;

[0026] Figure 5 For the present invention Figure 3 A magnified view of middle;

[0027] Figure 6 For the present invention Figure 3 Enlarged view of middle B;

[0028] Figure 7 is an enlarged view of the printing plate shell of the present invention;

[0029] Figure 8 It is an enlarged view of the arc-shaped limiting plate and the printing plate block of the present invention;

[0030] Fig. 9 is an enlarged view of the inkjet cavity of the present invention;

[0031] Among them, 1. mounting seat, 2. printing plate shell, 3. printing groove, 4. arc-shaped limit plate, 5. pattern groove, 6. rotating body, 7. conversion chamber, 8. rotating chamber, 9. ink storage chamber, 10. waste liquid chamber, 11. inkjet chamber, 12. pump body, 13. sliding rod, 14. printing plate block, 15. pattern protrusion, 16. slot hole, 17. injection hole, 18. limit block, 19. first sliding groove, 20. sliding body 20, 21. electromagnet, 22. metal body, 23 , sliding shell, 24, fixed body, 25, wedge groove, 26, wedge block, 27, limit rod, 28, rotating cam, 29, first motor, 30, contact wheel, 31, third sliding groove, 32, third compression spring, 33, second compression spring, 34, second rotating shaft, 35, cleaning roller, 36, soft brush layer, 37, second motor, 38, driving motor, 39, cleaning brush layer, 40, rotating handle, 41, ink scraper holder, 42, pressure roller, 43, third motor. DETAILED DESCRIPTION

[0032] The technical solutions of various embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which 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 cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 to Figure 9The packaging bag printing device shown includes a mounting seat 1. A specific embodiment is that the bottom of the mounting seat 1 is filled with ink, and a rotatable printing plate shell 2 is rotatably connected inside the mounting seat 1. The printing plate shell 2 is set to be cylindrical. When the printing plate shell 2 rotates, it contacts the ink so that the ink adheres to the surface of the printing plate shell 2. A printing groove 3 is opened on the printing plate shell 2, and a plurality of arc-shaped limit plates 4 that can be embedded in the printing groove 3 are evenly distributed in the printing plate shell 2. In this embodiment, the number of the arc-shaped limit plates 4 is set to three, and the radius of the arc-shaped limit plates 4 is equal to that of the printing plate shell 2, so that when it is embedded in the printing groove 3, the arc-shaped limit plates 4 and the printing plate shell 2 form a complete "cylindrical" shape.

[0035] like Figure 1 to Figure 9 The packaging bag printing device shown in the figure has a specific embodiment in which a pattern groove 5 is provided on the arc-shaped limiting plate 4, and the shape of the pattern groove 5 is adaptively formulated according to the pattern to be printed. Specifically, during implementation, part or all of the parts that need to be made into grooves can be made into a "hollow pattern groove 5 plus a pattern protrusion 15 on the printing plate 14" to form a groove part in a manner of combining so that the pattern groove is separated into two parts. A rotatable rotating body 6 is rotatably connected to the middle part of the printing plate shell 2. The rotating body 6 includes a conversion chamber 7, a rotation chamber 8, an ink storage chamber 9, and a waste liquid chamber 10. The rotation chamber 8 is located in the middle of the rotating body 6, the conversion chamber 7 is located on the outside of the rotation chamber 8, the waste liquid chamber 10 is located on the front side of the conversion chamber 7 and is connected to the conversion chamber 7. The front and rear sides of the rotation chamber 8 are respectively provided with ink storage chambers 9. An inkjet cavity 11 corresponding to the arc-shaped limiting plate 4 is provided in the printing plate shell 2. One end of the inkjet cavity 11 is fixedly connected to the arc-shaped limiting plate 4, and the other end is fixedly connected to the printing plate The block 14 is flexibly connected, and a pump body 12 is fixedly connected in the inkjet cavity 11. One end of the pump body 12 is inserted into the rotating cavity 8 and is connected to the ink storage cavity 9. The pump body 12 can slide relatively in the ink storage cavity 9. A pattern protrusion 15 that cooperates with the pattern groove 5 is provided at the upper end of the printing plate block 14. A slot hole 16 that cooperates with the pattern protrusion 15 is provided on the inkjet cavity 11. The slot hole 16 is set as a through hole. The printing plate block 14 can slide in the slot hole 16. A plurality of injection holes 17 that can be connected with the slot hole 16 are provided in the inkjet cavity 11. The injection holes 17 of the printing plate block 14 are connected with the slot hole 16 when sliding. In this embodiment, when the printing plate block 14 slides relatively with the arc-shaped limiting plate 4, ink can be sprayed out through the injection holes 17, so that the ink appears from the bottom of the groove, and the ink in the entire groove can be evenly replaced, which prevents the phenomenon that the ink at the bottom of the traditional groove is always retained, improves the uniformity of the ink, and is conducive to improving the printing effect.

[0036] like Figure 1 to Figure 9The packaging bag printing device shown in the figure is a specific embodiment. A plurality of slots corresponding to the limit plates are provided on the rotating chamber 8. A slidable sliding rod 13 is slidably connected in the slot. The slot guides the sliding of the sliding rod 13. The upper end of each sliding rod 13 is flexibly connected to a printing plate block 14. Specifically, a third sliding groove 31 is provided on the printing plate block 14. The upper end of the sliding rod 13 is inserted into the third sliding groove 31 and can slide in the third sliding groove 31. A third compression spring 32 is fixedly connected between the sliding rod 13 and the printing plate block 14. The third compression spring 32 is located in the third sliding groove 31.

[0037] In the above or some embodiments, the rotating body 6 is fixedly connected to the limit block 18, the limit block 18 is provided with a first sliding groove 19, the limit block 18 is slidably connected to a sliding body 20 that can slide in the first sliding groove 19, the upper and lower ends of the sliding body 20 are respectively fixedly connected to the electromagnet 21, the two ends of the limit block 18 are respectively fixedly connected to the metal body 22 that can attract the electromagnet 21 on the corresponding side, and the sliding body 20 is fixedly connected to the sliding shell 23. Specifically, when the electromagnet 21 contacts the metal body 22 on the side close to the printed thin shell, the sliding body 20 drives the sliding shell 23 to move upward, and the rotating body 6 is fixedly connected to a fixed body 24 corresponding to the limiting block 18. A wedge-shaped groove 25 is provided in the fixed body 24, and an inclined surface is provided in the wedge groove 25. The upper end of the sliding shell 23 is fixedly connected to a wedge block 26 located in the wedge groove 25. The wedge block 26 can slide along the inclined surface. When the wedge block 26 slides on the inclined surface, it can extend out of the wedge groove 25. The inkjet cavity 11 is fixedly connected to a limiting rod 27 corresponding to the wedge block 26 on its corresponding side. When the wedge block 26 slides in the wedge groove 25, it can contact the limiting rod 27.

[0038] like Figure 1 to Figure 9 The packaging bag printing device shown in a specific embodiment is that a rotating cam 28 is rotatably connected to the middle of the rotating chamber 8, one end of the rotating cam 28 is fixedly connected to a first motor 29, the first motor 29 is fixedly connected in the rotating body 6, and a protective cover is welded and fixed to the outer side of the first motor 29 for protecting the first motor 29, and one end of each sliding rod 13 close to the rotating cam 28 is rotatably connected to a contact wheel 30, and the contact wheel 30 is rollingly connected to the rotating cam 28 to facilitate relative sliding between the sliding rod 13 and the rotating body 6.

[0039] like Figure 1 to Figure 9 In a specific embodiment of the packaging bag printing device shown, a plurality of second compression springs 33 are fixedly connected between the inkjet cavity 11 and the printing plate block 14 , and the elastic coefficient of the second compression spring 33 is much smaller than the elastic coefficient of the third compression spring 32 .

[0040] like Figure 1 to Figure 9The packaging bag printing device shown in the figure is a specific embodiment. A second rotating shaft 34 is rotatably connected in the mounting seat 1, a cleaning roller 35 is fixedly connected to the outer side of the second rotating shaft 34, a soft brush layer 36 is fixedly connected to the surface of the cleaning roller 35, and the soft brush layer 36 can contact the printing plate thin layer. A second motor 37 is coaxially fixedly connected to one side of the second rotating shaft 34, and the second motor 37 is fixedly connected to the mounting seat 1. In this embodiment, the second motor 37 drives the second rotating shaft 34 to rotate, the second rotating shaft 34 drives the cleaning roller 35 to rotate, the cleaning roller 35 drives the soft brush layer 36 to rotate, and the soft brush layer 36 rubs and cleans the surface of the printing plate thin shell 2.

[0041] like Figure 1 to Figure 9 In a specific embodiment of the packaging bag printing device shown, one end of the printing plate shell 2 is fixedly connected to a driving motor 38, and the driving motor 38 is fixedly connected to the mounting base 1 to facilitate driving the printing plate shell 2 to rotate.

[0042] like Figure 1 to Figure 9 A specific embodiment of the packaging bag printing device shown is that a cleaning brush layer 39 is fixedly connected to the interior of the printing plate shell 2, and the cleaning brush layer 39 can contact the surface of the printing plate block 14. The printing plate block 14 received in the interior of the printing plate shell 2 can contact the cleaning brush layer 39 and further clean it.

[0043] like Figure 1 to Figure 9 The packaging bag printing device shown is a specific embodiment in which a scraper holder 41 in contact with the printing plate shell 2 is fixedly mounted on the mounting seat 1, a pressure roller 42 is rotatably connected to the upper end of the mounting seat 1, one end of the pressure roller 42 is fixedly connected to a third motor 43, and the third motor 43 is fixedly connected to the mounting seat 1 to drive the pressure roller 42 to rotate.

[0044] like Figure 1 to Figure 9 The packaging bag printing device shown in a specific embodiment is that a rotating handle 40 is fixedly connected to one side of the rotating body 6, and the rotating handle 40 is rotatably connected to the mounting base 1. When the relative position between the rotating body 6 and the printing plate shell 2 is adjusted, the printing plate shell 2 is fixed manually, and then the rotating handle 40 is rotated to drive the rotating body 6 to rotate, so that it is convenient to replace between multiple printing plate blocks 14.

[0045] When the device is in use, the arc-shaped limit plate 4 cooperates with the printing plate block 14 to separate the traditional pattern groove engraved on the printing roller into two parts, which is convenient for cleaning during the printing process. The arc-shaped limit plate 4 and the printing plate block 14 slide relative to each other, so that the ink dried in the groove is pushed out, which is conducive to improving the cleaning effect. At the same time, when the printing plate shell 2 contacts with the soft brush layer 36, the relative position height of the printing plate block 14 and the arc-shaped limit plate 4 is adjusted, so that the soft brush layer 36 can simultaneously clean the printing plate block 14 and the arc-shaped limit plate 4. The surface is cleaned. When the arc-shaped limit plate 4 is received into the printing plate shell 2, the cleaning brush layer 39 inside the printing plate shell 2 cleans the surface of the arc-shaped limit plate 4 and the printing plate block 14. When the printing plate block 14 and the arc-shaped limit plate 4 slide relative to each other, the ink can be sprayed out through the injection hole 17, so that the ink appears from the bottom of the groove, and the ink in the entire groove can be evenly replaced, preventing the phenomenon of ink always being retained at the bottom of the traditional groove, thereby improving the uniformity of the ink, which is beneficial to improving the printing effect and further reducing the occurrence of ink drying.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A packaging bag printing device, comprising a mounting seat (1), characterized in that: The bottom of the mounting seat (1) is filled with ink, and a rotatable printing plate shell (2) is arranged in the mounting seat (1). A printing groove (3) is provided on the printing plate shell (2). A plurality of arc-shaped limiting plates (4) that can be embedded in the printing groove (3) are evenly distributed in the printing plate shell (2). The radius of the arc-shaped limiting plates (4) is equal to that of the printing plate shell (2). A pattern groove (5) is provided on the arc-shaped limiting plates (4). A printing plate shell (2) is provided in the middle. A rotatable rotating body (6) is arranged, the rotating body (6) comprising a conversion chamber (7), a rotation chamber (8), an ink storage chamber (9), and a waste liquid chamber (10), the rotation chamber (8) being located in the middle of the rotating body (6), the conversion chamber (7) being located outside the rotation chamber (8), the waste liquid chamber (10) being located in front of the conversion chamber (7) and being communicated with the conversion chamber (7), the front and rear sides of the rotation chamber (8) being respectively arranged as ink storage chambers (9), and the printing plate shell (2) being provided with a plurality of ink storage chambers (9). An inkjet cavity (11) is provided which corresponds to the arc-shaped limit plate (4) one by one. One end of the inkjet cavity (11) is fixedly connected to the arc-shaped limit plate (4). A pump body (12) is provided in the inkjet cavity (11). One end of the pump body (12) is inserted into the rotating cavity (8) and communicates with the ink storage cavity (9). A plurality of slots are provided on the rotating cavity (8). A slidable sliding rod (13) is provided in the slot. The upper end of each sliding rod (13) is A printing plate block (14) is provided, wherein a pattern protrusion (15) cooperating with the pattern groove (5) is provided at the upper end of the printing plate block (14), a slot hole (16) cooperating with the pattern protrusion (15) is provided on the inkjet cavity (11), the printing plate block (14) can slide in the slot hole (16), and an injection hole (17) is provided in the inkjet cavity (11), and the injection hole (17) can be connected with the slot hole (16) when the printing plate block (14) slides; The rotating body (6) is provided with a limit block (18), the limit block (18) is provided with a first sliding groove (19), the limit block (18) is provided with a sliding body (20) which can slide in the first sliding groove (19), the upper and lower ends of the sliding body (20) are respectively provided with electromagnets (21), the upper and lower ends of the limit block (18) are respectively provided with metal bodies (22) which can attract the electromagnets (21) on the corresponding sides, the sliding body (20) is provided with a sliding shell (23), and the printing plate shell (2) is provided with a fixed body ( 24), a wedge-shaped groove (25) is provided in the fixed body (24), an inclined surface is provided in the wedge-shaped groove (25), a wedge-shaped block (26) located in the wedge-shaped groove (25) is provided on the sliding shell (23), the wedge-shaped block (26) can slide along the inclined surface, and the wedge-shaped block (26) can extend out of the wedge-shaped groove (25) when sliding on the inclined surface, and a limiting rod (27) corresponding to the wedge-shaped block (26) on the corresponding side is provided on the inkjet cavity (11), and the wedge-shaped block (26) can contact the limiting rod (27) when sliding in the wedge-shaped groove (25); A rotating cam (28) is disposed in the middle of the rotating chamber (8), a first motor (29) is disposed at one end of the rotating cam (28), and the first motor (29) is fixedly connected to the rotating body (6). A contact wheel (30) is disposed at one end of each sliding rod (13) close to the rotating cam (28), and the contact wheel (30) is rollingly connected to the rotating cam (28).

2. The packaging bag printing device according to claim 1, characterized in that: The printing plate block (14) is provided with a third sliding groove (31), the upper end of the sliding rod (13) is inserted into the third sliding groove (31) and can slide in the third sliding groove (31), and a third compression spring (32) is provided between the sliding rod (13) and the printing plate block (14).

3. The packaging bag printing device according to claim 1, characterized in that: A plurality of second compression springs (33) are arranged between the inkjet cavity (11) and the printing plate block (14), and the elastic coefficient of the second compression spring (33) is much smaller than the elastic coefficient of the third compression spring (32).

4. The packaging bag printing device according to claim 1, characterized in that: A second rotating shaft (34) is arranged in the mounting seat (1), a cleaning roller (35) is arranged on the second rotating shaft (34), a soft brush layer (36) is arranged on the surface of the cleaning roller (35), and the soft brush layer (36) can contact the printing plate thin layer, and a second motor (37) is arranged on one side of the second rotating shaft (34), and the second motor (37) is fixedly connected to the mounting seat (1).

5. The packaging bag printing device according to claim 1, characterized in that: A driving motor (38) is provided at one end of the printing plate shell (2), and the driving motor (38) is fixedly connected to the mounting seat (1).

6. The packaging bag printing device according to claim 1, characterized in that: A cleaning brush layer (39) is provided inside the printing plate shell (2), and the cleaning brush layer (39) can be in contact with the surface of the printing plate block (14).

7. The packaging bag printing device according to claim 1, characterized in that: A rotating handle (40) is coaxially fixedly connected to one side of the rotating body (6), and the rotating handle (40) is rotatably connected to the mounting seat (1).

8. The packaging bag printing device according to claim 1, characterized in that: The mounting seat (1) is provided with an ink scraper holder (41) in contact with the printing plate shell (2); a pressure roller (42) is provided at the upper end of the mounting seat (1); a third motor (43) is provided at one end of the pressure roller (42); and the third motor (43) is fixedly connected to the mounting seat (1).

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