Plastic packaging bag printing device

Abstract

The invention provides a plastic packaging bag printing device, and belongs to the technical field of plastic packaging bag printing, the plastic packaging bag printing device comprises a printing table, the top of the printing table is fixedly connected with an outer cover, the top of the outer cover is fixedly connected with a top plate, the top of the printing table is fixedly connected with a plurality of vertical rods, and the outer side walls of the vertical rods are slidably connected with fixing plates; a plurality of fixing rods are fixedly connected to the side walls of the fixing plates, threaded sleeves are fixedly connected to the ends of the fixing rods, a first motor is fixedly connected to the bottom of the printing table, an output shaft of the first motor is fixedly connected with a threaded shaft, and supporting plates are fixedly connected to the side walls of the fixing plates. The air injection assembly is used for cleaning impurities on the surfaces of plastic packaging bags. The scraping plate assembly is arranged on one side of the supporting plate, and the scraping plate assembly is used for printing work of the plastic packaging bag; and the pressing plate assembly is arranged below the scraping plate assembly, and the pressing plate assembly is used for flattening the plastic packaging bag.

Description

Technical Field

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

[0002] Plastic packaging bag printing is a process of transferring design patterns onto plastic packaging materials. This technology not only enhances the visual appeal of ordinary plastic bags, but also gives them more functionality and personalized features. Whether it is supermarket shopping bags or clothing brand packaging bags, printing technology can achieve a transformation from monotonous and practical to unique, thereby better attracting customers' attention. At the same time, this customized service also provides brands with an effective way to showcase their own image and promote their ideas, which helps to enhance brand image and market competitiveness.

[0003] In the process of printing plastic packaging bags, if wrinkles appear on the surface of the packaging bags, this will directly affect the quality of printing. The presence of wrinkles means that the surface of the plastic bag has lost its flatness. When ink is printed on these irregular areas, a complete and continuous pattern cannot be formed, resulting in the pattern being disconnected or deformed, which greatly reduces the overall effect. In addition to wrinkles, the presence of small particles is also an important factor affecting the printing effect. These particles may be dust, fibers or other tiny impurities. If they are not removed before printing, they will form obstacles on the surface of the plastic bag. When the ink tries to cover these foreign objects, it will not be able to spread evenly due to the presence of the particles, resulting in an uneven surface of the pattern, and even leaving blank spots or patches in the pattern. Such defects not only destroy the overall beauty of the pattern, but also in actual use, these foreign objects not covered by the ink may fall off under touch or friction, further destroying the integrity of the pattern. How to invent a plastic packaging bag printing device to improve these problems has become a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a plastic packaging bag printing device, which aims to prevent the problem that wrinkles appear on the surface of the packaging bag or small particles are contaminated during the printing process of the plastic packaging bag, thereby affecting the printing quality.

[0005] The present invention is achieved in that:

[0006] The present invention provides a plastic packaging bag printing device, comprising a printing platform, wherein the top of the printing platform is fixedly connected to an outer cover, the top of the outer cover is fixedly connected to a top plate, the top of the printing platform is fixedly connected to a plurality of vertical poles, the outer side walls of the vertical poles are slidably connected to a fixing plate, the side walls of the fixing plate are fixedly connected to a plurality of fixing rods, the ends of the fixing rods are fixedly connected to a threaded sleeve, the bottom of the printing platform is fixedly connected to a first motor, the output shaft of the first motor is fixedly connected to a threaded shaft, the side walls of the plurality of fixing plates are fixedly connected to a support plate, and further comprising: an air jet assembly, the air jet assembly is arranged inside the outer cover, and the air jet assembly is used to clean impurities on the surface of the plastic packaging bag; a scraper assembly, the scraper assembly is arranged on one side of the support plate, and the scraper assembly is used for printing the plastic packaging bag; a pressing plate assembly, the pressing plate assembly is arranged below the scraper assembly, and the pressing plate assembly is used to flatten the plastic packaging bag.

[0007] Preferably, the jet assembly includes a vertical plate, the outer wall of the vertical plate is fixedly connected to an air cylinder, the bottom of the air cylinder is fixedly connected to an air pipe, the inside of the air cylinder is slidably connected to a piston, the top of the piston is fixedly connected to a push rod, the side wall of the push rod is sleeved with a tension spring, the top of the push rod is fixedly connected to a lever, a push block is provided below the lever, the side wall of the vertical plate is fixedly connected to a card box, a pin body and a push spring are provided in the side wall of the card box, the side wall of the pin body is fixedly connected to a claw, and the inner side wall of the card box is rotatably connected to an upper swing rod and a lower swing rod.

[0008] Preferably, the two ends of the tension spring are fixedly connected to the lever and the air cylinder respectively, the push block penetrates the vertical plate and is fixedly connected to the support plate, the pin body is slidably arranged with the card box, the bottom surface of the pin body is inclined, the upper swing rod and the lower swing rod are meshed by two gears, the end of the upper swing rod is located inside the claw, the side wall of the lower swing rod is provided with a trapezoidal boss, and the air pipe is connected with the air cylinder.

[0009] Preferably, the scraper assembly includes side frames fixedly connected to both sides of the support plate, the side frames are slidably connected to a plurality of sliding shafts inside, the bottom ends of the sliding shafts are rotatably connected to a fixed frame, the tops of the plurality of sliding shafts are fixedly connected to a support rod, an adjusting rod is sleeved inside the support rod, and a turning handle is fixedly connected to the top of the adjusting rod.

[0010] Preferably, the outer side wall of the side frame is fixedly connected to a second motor, the output shaft of the second motor is fixedly connected to a screw rod, the side wall of the support plate is fixedly connected to a plurality of sliding rods, the outer side wall of the sliding rod is slidably connected to a slide, the side wall of the slide is fixedly connected to a lining plate, the side wall of the lining plate is fixedly connected to a threaded block, and the side wall of the lining plate is fixedly connected to a large arm.

[0011] Preferably, two cylinders are fixedly connected inside the upper arm, the telescopic shafts of the cylinders are fixedly connected to a balance rod, both ends of the balance rod are fixedly connected to long rods, the bottom of the long rods is fixedly connected to a plate frame, and a scraper plate is provided at the bottom of the plate frame.

[0012] Preferably, the adjusting rod is rotatably connected to the support rod via a second thread, the adjusting rod is rotatably connected to the side frame, the threaded block is rotatably connected to the screw rod, and the long rod penetrates the boom and is slidably arranged with the boom.

[0013] Preferably, the pressure plate assembly includes two movable frames arranged on the inner side of the fixed frame, a mesh plate is arranged between the two movable frames, a pressure strip is slidably connected inside the fixed frame, a plurality of first springs are fixedly connected to the top of the pressure strip, the air pipe is fixedly connected to the pressure strip, and a plurality of through holes are opened on the side wall of the pressure strip.

[0014] Preferably, the pressure plate assembly also includes four moving bars slidably arranged at the bottom of the moving frame, the side walls of the moving bars are fixedly connected with a plurality of sliding cards, the side walls of the moving bars are fixedly connected with a plurality of second springs, and the bottom of the moving frame is provided with a plurality of inclined grooves.

[0015] Preferably, the mesh plate is fixedly connected to the movable frame by a plurality of bolts, the first spring is fixedly connected to the fixed frame, the air pipe is connected to a plurality of through holes, the relative sliding surfaces of the movable bar and the movable frame are arranged at an angle of forty-five degrees to the horizontal plane, the bottom surface of the movable bar is lower than the bottom surface of the movable frame, the slide card is slidably arranged in the inclined groove, the four movable bars respectively correspond to the four corners of the fixed frame, and the four movable bars are arranged to slide in opposite directions.

[0016] The beneficial effects of the present invention are as follows: the jet assembly is driven to work by the up and down movement of the support plate, and the compressed air in the jet assembly is ejected from the through hole on the pressure strip through the air pipe, so that the compressed air blows over the surface of the packaging bag, and foreign matters such as dust and fiber on the compressed bag are cleaned, thereby preventing the printing effect from being affected by foreign matters on the surface of the packaging bag;

[0017] The fixed frame moves downward, driving the moving bar in the pressing plate assembly to be pressed down, and the four moving bars move away from each other. The surface of the plastic packaging bag will be flattened due to the movement of the four moving bars away from each other, preventing the printing effect from being affected by wrinkles on the packaging bag surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of an outer cover of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of an air jet assembly of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0023] Figure 5 It is a schematic structural diagram of a scraper assembly of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 The enlarged view of point B in the middle;

[0025] Figure 7 yes Figure 5 Enlarged view of point C in the middle;

[0026] Figure 8 This is a schematic diagram of the position of a screen plate of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0027] Fig. 9 This is a schematic diagram of the position of a layering strip of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0028] Fig.10 This is a schematic diagram of the position of a moving bar of a plastic packaging bag printing device provided by an embodiment of the present invention;

[0029] Fig.11 It is a schematic diagram of the planar structure of a moving bar of a plastic packaging bag printing device provided in an embodiment of the present invention.

[0030] In the figure: 1, printing table; 10, outer cover; 11, top plate; 12, vertical rod; 13, fixed plate; 14, fixed rod; 15, first motor; 16, threaded shaft; 17, threaded sleeve; 18, support plate; 2, vertical plate; 20, air cylinder; 21, piston; 22, push rod; 23, tension spring; 24, lever; 25, card box; 26, push block; 27, pin body; 28, push spring; 29, claw; 30, upper swing rod; 31, lower swing rod; 32, air pipe; 33, trapezoidal boss; 4, side frame; 41, Sliding shaft; 42, adjusting rod; 43, supporting rod; 44, turning handle; 45, second motor; 46, screw rod; 47, sliding rod; 48, sliding frame; 49, lining plate; 50, threaded block; 51, upper arm; 52, cylinder; 54, long rod; 55, balancing rod; 56, plate frame; 57, scraping plate; 6, fixed frame; 60, bolt; 61, movable frame; 62, mesh plate; 63, pressure strip; 64, first spring; 65, through hole; 66, movable strip; 67, sliding card; 68, second spring; 69, inclined groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example, see Figure 1-Figure 11 A plastic packaging bag printing device comprises a printing platform 1, wherein the top of the printing platform 1 is fixedly connected with an outer cover 10, the top of the outer cover 10 is fixedly connected with a top plate 11, the top of the printing platform 1 is fixedly connected with a plurality of vertical poles 12, the outer side wall of the vertical pole 12 is slidably connected with a fixing plate 13, the side wall of the fixing plate 13 is fixedly connected with a plurality of fixing rods 14, the end of the fixing rod 14 is fixedly connected with a threaded sleeve 17, the bottom of the printing platform 1 is fixedly connected with a first motor 15, the output shaft of the first motor 15 is fixedly connected with a threaded shaft 16, the side walls of the plurality of fixing plates 13 are fixedly connected with a support plate 18, and further comprises: an air jet assembly, which is arranged inside the outer cover 10 and is used to clean impurities on the surface of the plastic packaging bag; a scraper assembly, which is arranged on one side of the support plate 18 and is used for printing the plastic packaging bag; a pressing plate assembly, which is arranged below the scraper assembly and is used to flatten the plastic packaging bag;

[0033] The jet assembly includes a vertical plate 2, the outer wall of the vertical plate 2 is fixedly connected to the air cylinder 20, the bottom of the air cylinder 20 is fixedly connected to the air pipe 32, the interior of the air cylinder 20 is slidably connected to the piston 21, the top of the piston 21 is fixedly connected to the push rod 22, the side wall of the push rod 22 is sleeved with a tension spring 23, the top of the push rod 22 is fixedly connected to the lever 24, and a push block 26 is arranged below the lever 24, the side wall of the vertical plate 2 is fixedly connected to the card box 25, the side wall of the card box 25 is provided with a pin body 27 and a push spring 28, the side wall of the pin body 27 is fixedly connected There is a claw 29, the inner side wall of the card box 25 is rotatably connected with an upper swing rod 30 and a lower swing rod 31, the two ends of the tension spring 23 are respectively fixedly connected with the lever 24 and the air cylinder 20, the push block 26 penetrates the vertical plate 2 and is fixedly connected with the support plate 18, the pin body 27 is slidably arranged with the card box 25, the bottom surface of the pin body 27 is inclined, the upper swing rod 30 and the lower swing rod 31 are meshed through two gears, the end of the upper swing rod 30 is located inside the claw 29, the side wall of the lower swing rod 31 is provided with a trapezoidal boss 33, and the air pipe 32 is connected with the air cylinder 20;

[0034] It should be noted that the support plate 18 moves upward, driving the push block 26 to move upward, thereby driving the lever 24 to move upward, and the lever 24 pulls the tension spring 23 to store force. When the lever 24 moves above the pin body 27, the pin body 27 is stuck to the lever 24 due to the thrust of the push spring 28, so that the tension spring 23 no longer rebounds. When the support plate 18 drives the push block 26 to move downward, the push block 26 squeezes the trapezoidal boss 33, causing the lower swing rod 31 to rotate, and the lower swing rod 31 drives the upper end of the upper swing rod 30 to move in the direction away from the lever 24. The upper swing rod 30 pulls the pin body 27 through the claw 29 and no longer blocks the lever 24. The lever 24 rebounds instantly under the pulling force of the tension spring 23, and drives the piston 21 downward through the push rod 22, squeezing the gas inside the cylinder 20, so that the compressed gas rushes out of the air pipe 32 instantly.

[0035] The scraper assembly includes a side frame 4 fixedly connected to both sides of the support plate 18, a plurality of sliding shafts 41 are slidably connected inside the side frame 4, the bottom end of the sliding shaft 41 is rotatably connected to the fixed frame 6, a support rod 43 is fixedly connected to the top of the plurality of sliding shafts 41, an adjusting rod 42 is sleeved inside the support rod 43, a turning handle 44 is fixedly connected to the top of the adjusting rod 42, a second motor 45 is fixedly connected to the outer wall of the side frame 4, a screw rod 46 is fixedly connected to the output shaft of the second motor 45, a plurality of sliding rods 47 are fixedly connected to the side wall of the support plate 18, a slide 48 is slidably connected to the outer wall of the slide 47, and a side wall of the slide 48 is fixedly connected to The lining plate 49 has a threaded block 50 fixedly connected to the side wall of the lining plate 49, and a large arm 51 fixedly connected to the side wall of the lining plate 49. Two cylinders 52 are fixedly connected to the inside of the large arm 51. The telescopic shaft of the cylinder 52 is fixedly connected to a balance rod 55. The two ends of the balance rod 55 are fixedly connected to a long rod 54. The bottom of the long rod 54 is fixedly connected to a plate frame 56. A scraper plate 57 is arranged at the bottom of the plate frame 56. The adjusting rod 42 is rotatably connected to the support rod 43 through a second thread. The adjusting rod 42 is rotatably connected to the side frame 4. The threaded block 50 is rotatably connected to the screw rod 46. The long rod 54 penetrates the large arm 51 and is slidably arranged with the large arm 51.

[0036] The pressure plate assembly includes two moving frames 61 arranged inside the fixed frame 6, a mesh plate 62 is arranged between the two moving frames 61, a pressure strip 63 is slidably connected inside the fixed frame 6, a plurality of first springs 64 are fixedly connected to the top of the pressure strip 63, the air pipe 32 is fixedly connected to the pressure strip 63, a plurality of through holes 65 are opened on the side wall of the pressure strip 63, the pressure plate assembly also includes four moving strips 66 slidably arranged at the bottom of the moving frame 61, a plurality of slide cards 67 are fixedly connected to the side wall of the moving strip 66, a plurality of second springs are fixedly connected to the side wall of the moving strip 66 Spring 68, a plurality of inclined grooves 69 are provided at the bottom of the movable frame 61, the mesh plate 62 is fixedly connected to the movable frame 61 by a plurality of bolts 60, the first spring 64 is fixedly connected to the fixed frame 6, the air pipe 32 is connected to a plurality of through holes 65, the relative sliding surface of the movable bar 66 and the movable frame 61 is set at an angle of forty-five degrees to the horizontal plane, the bottom surface of the movable bar 66 is lower than the bottom surface of the movable frame 61, the slide card 67 is slidably set in the inclined groove 69, the four movable bars 66 correspond to the four corners of the fixed frame 6 respectively, and the four movable bars 66 are set to slide in the opposite direction.

[0037] It should be noted that, as the fixing frame 6 moves downward, the pressure strip 63 first contacts the printing platform 1 below. When a plastic packaging bag is placed on the printing platform 1, the pressure strip 63 first presses the packaging bag. At this time, the jet assembly works, and the compressed air flows through the air pipe 32 and is ejected from the through hole 65 on the pressure strip 63, so that the compressed gas blows over the surface of the packaging bag. Then, the moving strip 66 is pressed down. When the moving strip 66 is pressed down, the four moving strips 66 are acted on by the slide card 67 and the inclined surface of the moving strip 66, and move away from each other. The surface of the plastic packaging bag will be flattened due to the movement of the four moving strips 66 away from each other, so as to prevent the printing effect from being affected by wrinkles on the surface of the packaging bag.

[0038] In this embodiment, if printing is to be performed, the plastic packaging bag to be printed is laid flat on the upper surface of the printing table 1, and the output shaft of the first motor 15 is controlled to rotate, driving the threaded shaft 16 to rotate, and the threaded shaft 16 drives the threaded sleeve 17 and the fixed rod 14 to move downward, and the fixed rod 14 drives the fixed plate 13 to slide downward along the outer side wall of the vertical rod 12, driving the support plate 18 and the side frame 4 to move downward. When the support plate 18 moves downward, the trapezoidal boss 33 is squeezed by the push block 26, triggering the jet assembly to work, and the upper surface of the packaging bag is cleaned.

[0039] The side frame 4 drives the fixed frame 6 to move downward through the sliding shaft 41, thereby driving the pressure plate assembly to move downward, and through the mesh plate 62 to move downward to cover the top of the plastic packaging bag. The telescopic rod of the cylinder 52 closest to the side frame 4 retracts, driving the balance rod 55 and the long rod 54 to move downward, driving the plate frame 56 and the scraper plate 57 to move downward, pressing the mesh surface in the mesh plate 62. The output shaft of the second motor 45 rotates to drive the screw rod 46 to rotate, and through the threaded block 50, the lining plate 49 and the large arm 51 move in the length direction of the screw rod 46, thereby driving the scraper plate 57 to scrape the mesh surface of the mesh plate 62, and the plastic packaging bag is printed.

[0040] After printing is completed, the first motor 15 drives the threaded shaft 16 to rotate, driving the threaded sleeve 17, the fixed rod 14, the fixed plate 13, and the support plate 18 to move upward. The support plate 18 pushes the lever 24 through the push block 26 to store power for the jet assembly to prepare for the next cleaning.

[0041] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A plastic packaging bag printing device, comprising a printing platform (1), wherein the top of the printing platform (1) is fixedly connected to an outer cover (10), the top of the outer cover (10) is fixedly connected to a top plate (11), the top of the printing platform (1) is fixedly connected to a plurality of vertical poles (12), the outer side walls of the vertical poles (12) are slidably connected to a fixed plate (13), the side walls of the fixed plate (13) are fixedly connected to a plurality of fixed rods (14), the ends of the fixed rods (14) are fixedly connected to a threaded sleeve (17), the bottom of the printing platform (1) is fixedly connected to a first motor (15), the output shaft of the first motor (15) is fixedly connected to a threaded shaft (16), and the side walls of the plurality of fixed plates (13) are fixedly connected to support plates (18), characterized in that: Also includes: An air jet assembly, the air jet assembly being arranged inside the outer cover (10) and being used for cleaning impurities on the surface of the plastic packaging bag; A scraper assembly, the scraper assembly is arranged on one side of the support plate (18), and the scraper assembly is used for printing on plastic packaging bags; A pressing plate assembly is arranged below the scraper assembly and is used for flattening the plastic packaging bag.

2. A plastic packaging bag printing device according to claim 1, characterized in that: The jet assembly comprises a vertical plate (2), the outer wall of the vertical plate (2) is fixedly connected to an air cylinder (20), the bottom of the air cylinder (20) is fixedly connected to an air pipe (32), the interior of the air cylinder (20) is slidably connected to a piston (21), the top of the piston (21) is fixedly connected to a push rod (22), the side wall of the push rod (22) is sleeved with a tension spring (23), the top of the push rod (22) is fixedly connected to a shift rod (24), a push block (26) is arranged below the shift rod (24), the side wall of the vertical plate (2) is fixedly connected to a card box (25), a pin body (27) and a push spring (28) are arranged inside the side wall of the card box (25), a claw (29) is fixedly connected to the side wall of the pin body (27), and an upper swing rod (30) and a lower swing rod (31) are rotatably connected to the inner wall of the card box (25).

3. A plastic packaging bag printing device according to claim 2, characterized in that: The two ends of the tension spring (23) are respectively fixedly connected to the lever (24) and the air cylinder (20); the push block (26) penetrates the vertical plate (2) and is fixedly connected to the support plate (18); the pin body (27) is slidably arranged with the card box (25); the bottom surface of the pin body (27) is inclined; the upper swing rod (30) and the lower swing rod (31) are meshed through two gears; the end of the upper swing rod (30) is located inside the claw (29); the side wall of the lower swing rod (31) is provided with a trapezoidal boss (33); and the air pipe (32) is connected with the air cylinder (20).

4. A plastic packaging bag printing device according to claim 2, characterized in that: The scraper assembly comprises a side frame (4) fixedly connected to both sides of the support plate (18); a plurality of sliding shafts (41) are slidably connected inside the side frame (4); the bottom ends of the sliding shafts (41) are rotatably connected to a fixed frame (6); the tops of the plurality of sliding shafts (41) are fixedly connected to a support rod (43); an adjusting rod (42) is sleeved inside the support rod (43); and a turning handle (44) is fixedly connected to the top of the adjusting rod (42).

5. A plastic packaging bag printing device according to claim 4, characterized in that: The outer side wall of the side frame (4) is fixedly connected to a second motor (45), the output shaft of the second motor (45) is fixedly connected to a screw rod (46), the side wall of the support plate (18) is fixedly connected to a plurality of slide rods (47), the outer side wall of the slide rod (47) is slidably connected to a slide frame (48), the side wall of the slide frame (48) is fixedly connected to a lining plate (49), the side wall of the lining plate (49) is fixedly connected to a threaded block (50), and the side wall of the lining plate (49) is fixedly connected to a large arm (51).

6. A plastic packaging bag printing device according to claim 5, characterized in that: Two cylinders (52) are fixedly connected inside the large arm (51), the telescopic shaft of the cylinder (52) is fixedly connected to a balance rod (55), both ends of the balance rod (55) are fixedly connected to long rods (54), the bottom of the long rod (54) is fixedly connected to a plate frame (56), and a scraping plate (57) is provided at the bottom of the plate frame (56).

7. A plastic packaging bag printing device according to claim 6, characterized in that: The adjusting rod (42) is rotatably connected to the supporting rod (43) via a second thread, the adjusting rod (42) is rotatably connected to the side frame (4), the threaded block (50) is rotatably connected to the screw rod (46), and the long rod (54) penetrates the upper arm (51) and is slidably arranged with the upper arm (51).

8. A plastic packaging bag printing device according to claim 4, characterized in that: The pressure plate assembly comprises two movable frames (61) arranged on the inner side of a fixed frame (6), a mesh plate (62) is arranged between the two movable frames (61), a pressure strip (63) is slidably connected inside the fixed frame (6), a plurality of first springs (64) are fixedly connected to the top of the pressure strip (63), the air pipe (32) is fixedly connected to the pressure strip (63), and a plurality of through holes (65) are opened on the side wall of the pressure strip (63).

9. A plastic packaging bag printing device according to claim 8, characterized in that: The pressure plate assembly also includes four moving bars (66) slidably arranged at the bottom of the moving frame (61), the side walls of the moving bars (66) are fixedly connected with a plurality of sliding cards (67), the side walls of the moving bars (66) are fixedly connected with a plurality of second springs (68), and the bottom of the moving frame (61) is provided with a plurality of inclined grooves (69).

10. A plastic packaging bag printing device according to claim 9, characterized in that: The mesh plate (62) is fixedly connected to the movable frame (61) by a plurality of bolts (60), the first spring (64) is fixedly connected to the fixed frame (6), the air pipe (32) is connected to a plurality of through holes (65), the relative sliding surface of the movable bar (66) and the movable frame (61) is set at an angle of forty-five degrees to the horizontal plane, the bottom surface of the movable bar (66) is lower than the bottom surface of the movable frame (61), the sliding card (67) is slidably set in the inclined groove (69), the four movable bars (66) respectively correspond to the four corners of the fixed frame (6), and the four movable bars (66) are set to slide in the opposite direction.

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