An automatic paper bag flipping device for a paper bag production line

Abstract

The present invention relates to the technical field of paper bag production, and particularly relates to an automatic paper bag flipping device for a paper bag production line, including: an operation box and a paper bag body. Two rollers are rotatably connected to the inner wall of the operation box through two rotating shafts. A first conveyor belt is connected to one of the rollers, and a second conveyor belt is connected to the other roller; a flipping mechanism, the flipping mechanism includes a hollow rod rotatably connected to the inner wall of the operation box. Two U-shaped plates are fixedly connected to the side wall of the hollow rod. The lower surface of one of the U-shaped plates faces the upper surface of the first conveyor belt. By rotating the hollow rod forward half a turn to change the positions of the two U-shaped plates, the initially upper surface of the adsorbed paper bag body will face downward, and the initially lower surface of the adsorbed paper bag body will face upward. In this way, the paper bag body can be conveyed out under the action of the second conveyor belt, and the surface of the paper bag body without printed patterns can be printed, thereby automatically flipping and conveying the front and back sides of the paper bag body.

Description

Technical Field

[0001] The present invention relates to the technical field of paper bag production, and particularly relates to an automatic paper bag flipping device for a paper bag production line. Background Art

[0002] There are many varieties of paper bags, various paper materials, and many styles, and there can be various display forms, such as white cardboard paper bags, whiteboard paper bags, copperplate paper bags, kraft paper bags, etc. When processing paper bags, printing and painting are carried out on both the front and back sides, and it is necessary to turn them over.

[0003] In the prior art, when printing and painting on both the front and back sides of a paper bag, it is carried out while moving on the production line. However, after printing and painting the front side of the paper bag, it is necessary for workers to manually flip the paper bag and then print and paint the back side. The labor intensity is high, and it is impossible to ensure the position consistency during the conveying process of the paper bag, which affects the printing and painting quality of the back side of the paper bag. Moreover, since impurities are inevitably contaminated on the back side of the paper bag after being conveyed on the production line, and these impurities are not cleaned after flipping, it affects the printing and painting quality of the back side of the paper bag again. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and to propose an automatic paper bag flipping device for a paper bag production line.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] An automatic paper bag flipping device for a paper bag production line, comprising:

[0007] An operation box and a paper bag body. Two rollers are rotatably connected to the inner wall of the operation box through two rotating shafts. A first conveyor belt is connected to one of the rollers, and a second conveyor belt is connected to the other roller;

[0008] A flipping mechanism. The flipping mechanism includes a hollow rod rotatably connected to the inner wall of the operation box. Two U-shaped plates are fixedly connected to the side wall of the hollow rod. The lower surface of one of the U-shaped plates faces the upper surface of the first conveyor belt, and the upper surface of the other U-shaped plate is flush with the upper surface of the second conveyor belt. A strip-shaped cavity is opened in each of the two U-shaped plates. A plurality of adsorption holes penetrating the side wall of the U-shaped plate are opened on the inner wall of the strip-shaped cavity. The openings of the plurality of adsorption holes close to the first conveyor belt face downward, and the openings of the plurality of adsorption holes close to the second conveyor belt face upward. The inner walls of the two strip-shaped cavities are both communicated with the inner wall of the hollow rod through a first air suction pipe, and an air suction mechanism is provided on the operation box.

[0009] Preferably, the air extraction mechanism includes an L-shaped plate fixedly connected to the side wall of the operation box. A exhaust pipe is fixedly connected to the side wall of the L-shaped plate. The side wall of the exhaust pipe is hermetically and rotatably connected to the inner side wall of the hollow rod. The side wall of the exhaust pipe is provided with a first arc-shaped groove. An air vent groove is provided on the side wall of the exhaust pipe away from the first arc-shaped groove. The first air extraction pipe close to the first conveyor belt is aligned with the first arc-shaped groove, and the first air extraction pipe close to the second conveyor belt is aligned with the air vent groove.

[0010] Preferably, solenoid valves are provided in both of the first air extraction pipes. Sensors are installed on the side walls of the two U-shaped plates away from the hollow rod. The sensors are electrically connected to their corresponding solenoid valves through an external control mechanism.

[0011] Preferably, a cleaning mechanism is provided on the U-shaped plate. The cleaning mechanism includes a groove opened on the U-shaped plate away from the strip cavity. A U-shaped rod is slidably connected to the inner wall of the groove. A plurality of brush hairs are fixedly connected to the side wall of the U-shaped rod. The plurality of brush hairs are close to the side wall of the U-shaped plate.

[0012] Preferably, suction pipes are fixedly connected to the side walls of the two U-shaped rods close to the brush hairs. The inner walls of the two suction pipes are communicated with the inner wall of the hollow rod through second air extraction pipes. A second arc-shaped groove is provided on the side wall of the exhaust pipe. The second air extraction pipe close to the first conveyor belt is aligned with the second arc-shaped groove during rotation.

[0013] Preferably, a reciprocating lead screw is rotatably connected to the inner wall of the groove. The side wall of the reciprocating lead screw is threadedly connected to the side wall of the U-shaped rod. A fixing plate is fixedly connected to the side wall of the U-shaped plate away from the hollow rod. A first bevel gear is rotatably connected to the side wall of the fixing plate through a cross bar. A second bevel gear is fixedly connected to the side wall of the reciprocating lead screw close to the fixing plate. The first bevel gear and the second bevel gear are meshed with each other.

[0014] Preferably, an arc-shaped toothed plate is fixedly connected to the inner top of the operation box. A first gear is fixedly connected to the side wall of the cross bar away from the first bevel gear. The first gear meshes with the arc-shaped toothed plate during the rotation following the fixing plate.

[0015] Preferably, a motor is fixedly connected to the side wall of the L-shaped plate. A second gear is fixedly connected to the side wall of the output shaft of the motor. A third gear is fixedly connected to the side wall of the hollow rod. The second gear and the third gear are meshed with each other.

[0016] Preferably, frame openings are provided on the inner walls of the operation box close to the upper surfaces of the first conveyor belt and the second conveyor belt. Guide plates are symmetrically and fixedly connected to the inner walls of the frame openings.

[0017] Preferably, two hot air blowers are fixedly connected to the inner top of the operation box. A box door is hinged to the side wall of the operation box.

[0018] Compared with the existing technology, the advantages of the present invention are as follows:

[0019] 1. A flipping mechanism is provided. When the hollow rod rotates forward half a turn to replace the positions of the two U-shaped plates, the initially upper surface of the adsorbed paper bag body will face downward, and the initially lower surface of the adsorbed paper bag body will face upward. And the first air suction pipe corresponding to the paper bag body will face the ventilation groove after rotating half a turn, so that the air pressure in the strip-shaped cavity returns to normal and no longer adsorbs the paper bag body, enabling the paper bag body to be conveyed out under the action of the second conveyor belt, and printing the surface of the paper bag body without printed patterns. Thus, the front and back sides of the paper bag body are automatically flipped and conveyed, avoiding the need for manual flipping of the paper bag body by workers for reverse printing and painting at present, which has a large labor intensity and cannot ensure the position consistency during the conveying process of the paper bag body.

[0020] 2. A cleaning mechanism is provided. When the first gear meshes with the arc-shaped tooth plate following the rotation of the fixed plate, the first gear will drive the reciprocating lead screw to rotate through the cross bar, the first bevel gear and the second bevel gear, driving the U-shaped rod to move, so that the brush bristles on the U-shaped rod clean the surface of the paper bag body without printed patterns, avoiding the inevitable contamination of impurities on the reverse side of the paper bag body during conveying on the production line in the prior art, and not cleaning these impurities after flipping, which affects the printing and painting quality of the reverse side of the paper bag body again.

[0021] 3. A dust suction pipe and a second air suction pipe are provided. When the U-shaped plate rotates to make the first gear mesh with the arc-shaped tooth plate, the second air suction pipe corresponding to the paper bag body is aligned with the second arc-shaped groove. At this time, the second arc-shaped groove sucks air from the dust suction pipe through the second air suction pipe. Then, following the movement of multiple brush bristles, the impurities cleaned from the reverse side of the paper bag body can be absorbed, avoiding the flow of impurities in the operation box and resulting in a decline in the cleaning effect on the reverse side of the paper bag body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an automatic paper bag flipping device for a paper bag production line proposed by the present invention;

[0023] Figure 2 is Figure 1 a vertical sectional structural diagram at two first air suction pipes in

[0024] Figure 3 is Figure 2 a magnified structural diagram at A in

[0025] Figure 4 is Figure 1 a vertical sectional structural diagram at two strip-shaped cavities in

[0026] Figure 5 is Figure 4Schematic enlarged view of the structure at B in [the figure];

[0027] Figure 6 is Figure 4 Schematic enlarged view of the structure at C in [the figure];

[0028] Figure 7 is Figure 1 Top view structure schematic of two U-shaped plates in [the figure];

[0029] Figure 8 is Figure 7 Schematic enlarged view of the structure at D in [the figure];

[0030] Figure 9 is Figure 1 Rear view structure schematic of [it].

[0031] In the figure: 1. Operation box; 2. Roller; 3. First conveyor belt; 4. Second conveyor belt; 5. Paper bag body; 6. Hollow rod; 7. U-shaped plate; 8. Strip-shaped cavity; 9. Suction hole; 10. L-shaped plate; 11. Exhaust pipe; 12. First suction pipe; 13. First arc-shaped groove; 14. Ventilation groove; 15. Solenoid valve; 16. Sensor; 17. Groove; 18. U-shaped rod; 19. Brush hair; 20. Dust suction pipe; 21. Second suction pipe; 22. Second arc-shaped groove; 23. Reciprocating lead screw; 24. Fixed plate; 25. Cross bar; 26. First bevel gear; 27. Second bevel gear; 28. Arc-shaped toothed plate; 29. First gear; 30. Motor; 31. Second gear; 32. Third gear; 33. Frame opening; 34. Guide plate; 35. Hot air blower; 36. Box door. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Referring to Figure 1 - Figure 9 , a paper bag automatic flipping device for a paper bag production line includes an operation box 1 and a paper bag body 5. Two rollers 2 are rotatably connected to the inner wall of the operation box 1 through two rotating shafts. A first conveyor belt 3 is connected to one of the rollers 2, and a second conveyor belt 4 is connected to the other roller 2.

[0034] It should be noted that the parts of the first conveyor belt 3 and the second conveyor belt 4 outside the operation box 1 in the present invention are connected to an external driving source (not shown in the figure).

[0035] The inner walls of the operation box 1 close to the upper surfaces of the first conveyor belt 3 and the second conveyor belt 4 are both provided with frame openings 33. The inner walls of the frame openings 33 are symmetrically and fixedly connected with guide plates 34, which can ensure that the positions of the paper bag body 5 correspond before and after flipping, and phenomena such as tilting will not occur.

[0036] Two hot air blowers 35 are fixedly connected to the inner top of the operation box 1, which can heat the paper bag body 5 flipped inside the operation box 1, facilitating the drying of the patterns printed and sprayed on the front of the paper bag body 5. A box door 36 is hinged on the side wall of the operation box 1.

[0037] Flipping mechanism, the flipping mechanism includes a hollow rod 6 rotatably connected to the inner wall of the operation box 1. Two U-shaped plates 7 are fixedly connected to the side wall of the hollow rod 6. The lower surface of one of the U-shaped plates 7 faces the upper surface of the first conveyor belt 3, and the upper surface of the other U-shaped plate 7 is flush with the upper surface of the second conveyor belt 4 (as Figure 2 shown). It should be noted that the lengths of the two rollers 2 are both less than the distance between the mutually close side walls of the U-shaped plates 7, so that during the rotation of the two U-shaped plates 7, the first conveyor belt 3 and the second conveyor belt 4 will not be collided.

[0038] Bar-shaped cavities 8 are opened in both of the two U-shaped plates 7. A plurality of adsorption holes 9 penetrating the side walls of the U-shaped plates 7 are opened on the inner walls of the bar-shaped cavities 8 (as Figure 5 shown). The openings of the plurality of adsorption holes 9 close to the first conveyor belt 3 face downward, and the openings of the plurality of adsorption holes 9 close to the second conveyor belt 4 face upward. The inner walls of the two bar-shaped cavities 8 are both communicated with the inner wall of the hollow rod 6 through the first air suction pipes 12. An air suction mechanism is provided on the operation box 1.

[0039] The air suction mechanism includes an L-shaped plate 10 fixedly connected to the side wall of the operation box 1. An exhaust pipe 11 is fixedly connected to the side wall of the L-shaped plate 10 (as Figure 9 shown). The side wall of the exhaust pipe 11 is hermetically and rotatably connected to the inner side wall of the hollow rod 6. A first arc-shaped groove 13 is opened on the side wall of the exhaust pipe 11 (as Figure 3 shown). An air ventilation groove 14 is opened on the side wall of the exhaust pipe 11 away from the first arc-shaped groove 13. The first air suction pipes 12 close to the first conveyor belt 3 face the first arc-shaped groove 13, and the first air suction pipes 12 close to the second conveyor belt 4 face the air ventilation groove 14.

[0040] It should be noted that the exhaust pipe 11 is communicated with the air inlet of an external negative pressure fan.

[0041] Solenoid valves 15 are provided in both of the two first air suction pipes 12 (as Figure 3 shown). Sensors 16 are installed on the side walls of the two U-shaped plates 7 away from the hollow rod 6 (as Figure 2 and Figure 7 shown). The sensors 16 are electrically connected to their corresponding solenoid valves 15 through an external control mechanism.

[0042] When the sensor 16 does not sense the signal of the paper bag body 5, the corresponding solenoid valve 15 is powered off and closed at this time.

[0043] A motor 30 is fixedly connected to the side wall of the L-shaped plate 10. A second gear 31 is fixedly connected to the side wall of the output shaft of the motor 30. A third gear 32 is fixedly connected to the side wall of the hollow rod 6. The second gear 31 and the third gear 32 are meshed with each other.

[0044] The first conveyor belt 3 can convey the paper bag body 5 with the front printed pattern (the unprinted surface is attached to the first conveyor belt 3). When the paper bag body 5 is conveyed to the lower surface of the U-shaped plate 7, the sensor 16 located on the U-shaped plate 7 senses the signal of the paper bag body 5 at this time. The corresponding solenoid valve 15 is powered on and opened at this time. Then, the external negative pressure fan extracts air from the plurality of adsorption holes 9 through the exhaust pipe 11, the first arc-shaped groove 13, the first air extraction pipe 12 and the strip-shaped cavity 8. At this time, under the action of negative pressure, the edge of the unprinted surface of the printed surface of the paper bag body 5 is adsorbed and attached to the lower surface of the U-shaped plate 7. Then, the driving motor 30 rotates forward half a turn, and then drives the hollow rod 6 to rotate forward half a turn through the second gear 31 and the third gear 32, replacing the positions of the two U-shaped plates 7. At this time, the printed surface of the adsorbed paper bag body 5 will face down, and the unprinted surface of the adsorbed paper bag body 5 will face up. And the first air extraction pipe 12 corresponding to the paper bag body 5 will be aligned with the ventilation groove 14 after rotating half a turn, so that the air pressure in the strip-shaped cavity 8 returns to normal and no longer adsorbs the paper bag body 5, so that the paper bag body 5 can be conveyed out under the action of the second conveyor belt 4, and the unprinted surface of the paper bag body 5 is printed, thereby automatically turning over and conveying the front and back sides of the paper bag body 5, avoiding the need for workers to manually turn over the paper bag body 5 and then print and spray paint its back side at present, with high labor intensity and unable to ensure the position consistency of the paper bag body 5 during the conveying process.

[0045] A cleaning mechanism is provided on the U-shaped plate 7. The cleaning mechanism includes a groove 17 (as shown in Figure 5 shown) opened on the U-shaped plate 7 away from the strip-shaped cavity 8. A U-shaped rod 18 is slidably connected to the inner wall of the groove 17. A plurality of brush hairs 19 are fixedly connected to the side wall of the U-shaped rod 18. The plurality of brush hairs 19 are close to the side wall of the U-shaped plate 7.

[0046] A reciprocating lead screw 23 is rotatably connected to the inner wall of the groove 17. The side wall of the reciprocating lead screw 23 is threadedly connected to the side wall of the U-shaped rod 18. A fixing plate 24 is fixedly connected to the side wall of the U-shaped plate 7 away from the hollow rod 6. A first bevel gear 26 is rotatably connected to the side wall of the fixing plate 24 through a cross bar 25. A second bevel gear 27 is fixedly connected to the side wall of the reciprocating lead screw 23 close to the fixing plate 24. The first bevel gear 26 and the second bevel gear 27 are meshed with each other.

[0047] An arc-shaped toothed plate 28 is fixedly connected to the inner top of the operation box 1 (as shown inFigure 4 As shown in the figure, a first gear 29 is fixedly connected to the side wall of the cross bar 25 away from the first bevel gear 26. During the rotation of the first gear 29 following the fixed plate 24, it meshes with the arc-shaped toothed plate 28.

[0048] During the rotation of the hollow rod 6 driving the two U-shaped plates 7, at this time, the two fixed plates 24 drive the two first gears 29 to rotate. When the first gear 29 meshes with the arc-shaped toothed plate 28 following the rotation of the fixed plate 24, at this time, the first gear 29 will drive the reciprocating lead screw 23 to rotate through the cross bar 25, the first bevel gear 26 and the second bevel gear 27, driving the U-shaped rod 18 to move, so that the bristles 19 on the U-shaped rod 18 clean the surface of the paper bag body 5 without printed patterns. When the first gear 29 meshes with the arc-shaped toothed plate 28 and then separates following the rotation of the fixed plate 24, the U-shaped rod 18 moves back and forth on the side wall of the reciprocating lead screw 23 to the initial position, which will not affect the normal removal of the subsequent paper bag body 5, realizing the cleaning of the reverse side of the paper bag body 5, avoiding the inevitable contamination of impurities on the reverse side of the paper bag body 5 after being conveyed on the production line in the prior art, and not cleaning these impurities after flipping it, which will affect the printing and painting quality of the reverse side of the paper bag body 5 again.

[0049] Vacuum suction pipes 20 are fixedly connected to the side walls of the two U-shaped rods 18 close to the bristles 19. The inner walls of the two vacuum suction pipes 20 are communicated with the inner wall of the hollow rod 6 through second suction pipes 21 (as Figure 8 shown in the figure). A second arc-shaped groove 22 is formed in the side wall of the exhaust pipe 11. The second suction pipe 21 close to the first conveyor belt 3 is aligned with the second arc-shaped groove 22 during rotation.

[0050] When the U-shaped plate 7 rotates to make the first gear 29 mesh with the arc-shaped toothed plate 28, at this time, the second suction pipe 21 corresponding to the paper bag body 5 is aligned with the second arc-shaped groove 22. At this time, the second arc-shaped groove 22 sucks air from the vacuum suction pipe 20 through the second suction pipe 21. Then, following the movement of the plurality of bristles 19, the impurities cleaned from the reverse side of the paper bag body 5 can be absorbed, avoiding the flow of impurities in the operation box 1, resulting in a decrease in the cleaning effect of the reverse side of the paper bag body 5.

[0051] After the front side of the paper bag body 5 is printed with a pattern, the first conveyor belt 3 can convey the paper bag body 5 with the front side printed pattern into the operation box 1. When the paper bag body 5 is conveyed to the lower surface of the U-shaped plate 7, the sensor 16 located on the U-shaped plate 7 senses the signal of the paper bag body 5 at this time. At this time, the electromagnetic valve 15 corresponding to the sensor 16 is energized and opened. Then, the external negative pressure fan extracts air from the plurality of adsorption holes 9 through the exhaust pipe 11, the first arc groove 13, the first air extraction pipe 12, and the strip cavity 8. At this time, under the action of negative pressure, the unprinted surface edge of the printed surface of the paper bag body 5 is adsorbed and attached to the lower surface of the U-shaped plate 7. Subsequently, the driving motor 30 rotates forward half a turn, and then drives the hollow rod 6 to rotate forward half a turn through the second gear 31 and the third gear 32, changing the positions of the two U-shaped plates 7. At this time, the surface of the paper bag body 5 with the printed pattern will face downwards, and the surface of the paper bag body 5 without the printed pattern will face upwards. And after the first air extraction pipe 12 corresponding to the paper bag body 5 rotates half a turn, it will be aligned with the ventilation groove 14, making the air pressure in the strip cavity 8 return to normal and no longer adsorb the paper bag body 5, so that the paper bag body 5 can be conveyed out under the action of the second conveyor belt 4, and the surface of the paper bag body 5 without the printed pattern is printed, thereby automatically flipping and conveying the front and back sides of the paper bag body 5, avoiding the need for workers to manually flip the paper bag body 5 and then print and spray paint its back side at present, with a large labor intensity and unable to ensure the position consistency of the paper bag body 5 during the conveying process;

[0052] At the same time, during the flipping process of the paper bag body 5, two hot blowers 35 can heat-treat the paper bag body 5 flipped in the operation box 1, facilitating the drying of the patterns printed and spray-painted on the front side of the paper bag body 5;

[0053] During the process of the hollow rod 6 driving the two U-shaped plates 7 to rotate, at this time, the two fixing plates 24 drive the two first gears 29 to rotate. When the first gear 29 meshes with the arc-shaped tooth plate 28 following the rotation of the fixing plate 24, at this time, the first gear 29 drives the reciprocating lead screw 23 to rotate through the cross bar 25, the first bevel gear 26, and the second bevel gear 27, driving the U-shaped rod 18 to move, so that the bristles 19 located on the U-shaped rod 18 clean the surface of the paper bag body 5 without the printed pattern. And when the first gear 29 meshes with the arc-shaped tooth plate 28 and then separates following the rotation of the fixing plate 24, the U-shaped rod 18 moves back and forth on the side wall of the reciprocating lead screw 23 to the initial position, which will not affect the normal removal of the subsequent paper bag body 5, realizing the cleaning of the back side of the paper bag body 5, avoiding the inevitable contamination of impurities on the back side of the paper bag body 5 after being conveyed on the production line in the prior art, and not cleaning these impurities after flipping it, which will affect the printing and spray painting quality of the back side of the paper bag body 5 again;

[0054] When the U-shaped plate 7 rotates to make the first gear 29 engage with the arc-shaped tooth plate 28, at this time, the second air extraction pipe 21 corresponding to the paper bag body 5 is aligned with the second arc-shaped groove 22. At this time, the second arc-shaped groove 22 extracts air from the dust suction pipe 20 through the second air extraction pipe 21. Furthermore, following the movement of a plurality of bristles 19, the impurities cleaned from the reverse side of the paper bag body 5 can be absorbed, preventing the impurities from flowing in the operation box 1 and resulting in a decline in the cleaning effect of the reverse side of the paper bag body 5.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An automatic paper bag turning device for a paper bag production line, characterized in that: Including: An operation box (1) and a paper bag body (5). Two rollers (2) are rotatably connected to the inner wall of the operation box (1) through two rotating shafts. A first conveyor belt (3) is connected to one of the rollers (2), and a second conveyor belt (4) is connected to the other roller (2). A flipping mechanism. The flipping mechanism includes a hollow rod (6) rotatably connected to the inner wall of the operation box (1). Two U-shaped plates (7) are fixedly connected to the side wall of the hollow rod (6). The lower surface of one of the U-shaped plates (7) faces the upper surface of the first conveyor belt (3), and the upper surface of the other U-shaped plate (7) is flush with the upper surface of the second conveyor belt (4). A strip-shaped cavity (8) is formed in each of the two U-shaped plates (7). A plurality of adsorption holes (9) penetrating the side wall of the U-shaped plate (7) are formed in the inner wall of the strip-shaped cavity (8). The openings of the plurality of adsorption holes (9) close to the first conveyor belt (3) face downward, and the openings of the plurality of adsorption holes (9) close to the second conveyor belt (4) face upward. The inner walls of the two strip-shaped cavities (8) are communicated with the inner wall of the hollow rod (6) through a first air suction pipe (12). An air suction mechanism is provided on the operation box (1). The air suction mechanism includes an L-shaped plate (10) fixedly connected to the side wall of the operation box (1). An exhaust pipe (11) is fixedly connected to the side wall of the L-shaped plate (10). The side wall of the exhaust pipe (11) is hermetically and rotatably connected to the inner side wall of the hollow rod (6). A first arc-shaped groove (13) is formed in the side wall of the exhaust pipe (11). A ventilation groove (14) is formed in the side wall of the exhaust pipe (11) far from the first arc-shaped groove (13). The first air suction pipe (12) close to the first conveyor belt (3) faces the first arc-shaped groove (13), and the first air suction pipe (12) close to the second conveyor belt (4) faces the ventilation groove (14). A cleaning mechanism is provided on the U-shaped plate (7). The cleaning mechanism includes a groove (17) formed in the U-shaped plate (7) away from the strip-shaped cavity (8). A U-shaped rod (18) is slidably connected to the inner wall of the groove (17). A plurality of brush hairs (19) are fixedly connected to the side wall of the U-shaped rod (18). The plurality of brush hairs (19) are close to the side wall of the U-shaped plate (7). A reciprocating lead screw (23) is rotatably connected to the inner wall of the groove (17). The side wall of the reciprocating lead screw (23) is threadedly connected to the side wall of the U-shaped rod (18). A fixing plate (24) is fixedly connected to the side wall of the U-shaped plate (7) away from the hollow rod (6). A first bevel gear (26) is rotatably connected to the side wall of the fixing plate (24) through a cross bar (25). A second bevel gear (27) is fixedly connected to the side wall of the reciprocating lead screw (23) close to the fixing plate (24). The first bevel gear (26) and the second bevel gear (27) are meshed with each other. An arc-shaped toothed plate (28) is fixedly connected to the inner top of the operation box (1). A first gear (29) is fixedly connected to the side wall of the cross bar (25) away from the first bevel gear (26). The first gear (29) meshes with the arc-shaped toothed plate (28) during the rotation following the fixing plate (24). Two hot blowers (35) are fixedly connected to the top of the operation box (1), and a box door (36) is hingedly connected to the side wall of the operation box (1).

2. The automatic paper bag turning device for a paper bag production line according to claim 1, characterized in that: The two first air extraction pipes (12) are each provided with an electromagnetic valve (15), and the side walls of the two U-shaped plates (7) away from the hollow rod (6) are each provided with a sensor (16), and the sensor (16) is electrically connected to its corresponding electromagnetic valve (15) through an external control mechanism.

3. The automatic paper bag turning device for a paper bag production line according to claim 1, characterized in that: The side walls of the two U-shaped rods (18) close to the bristles (19) are fixedly connected to a dust suction pipe (20); the inner walls of the two dust suction pipes (20) are connected to the inner wall of the hollow rod (6) through a second air suction pipe (21); a second arc-shaped groove (22) is formed on the side wall of the exhaust pipe (11); and the second air suction pipe (21) close to the first conveyor belt (3) is opposite to the second arc-shaped groove (22) during rotation.

4. The automatic paper bag turning device for a paper bag production line according to claim 1, characterized in that: A motor (30) is fixedly connected to the side wall of the L-shaped plate (10), a second gear (31) is fixedly connected to the side wall of the output shaft of the motor (30), a third gear (32) is fixedly connected to the side wall of the hollow rod (6), and the second gear (31) and the third gear (32) are meshed with each other.

5. The automatic paper bag turning device for a paper bag production line according to claim 1, characterized in that: The inner wall of the operation box (1) close to the upper surface of the first conveyor belt (3) and the second conveyor belt (4) is provided with a frame opening (33), and the inner wall of the frame opening (33) is symmetrically fixedly connected with a guide plate (34).

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