A negative pressure type ton bag packing machine

Abstract

The present invention belongs to the technical field of packaging machinery, in particular to a negative-pressure type ton bag packaging machine, which includes a housing, an external conveying mechanism, a lifting mechanism, and a switch door. A weighing top plate is fixed on the inner wall of the top of the housing. A hose is connected to the top of the weighing top plate. Hanging racks are fixed at both the front and rear ends of the weighing top plate. A shaft column is rotatably connected between the two ends of the hanging rack. A hook is fixedly sleeved on the shaft column. A rod portion is provided on the hook. A pair of first cylinders are fixed on the top of the weighing top plate. The output shaft of the first cylinder is connected with a connecting piece. A first connecting rod is rotatably connected between the connecting piece and the rod portion. In the present invention, the lifting mechanism lifts the ton bag upwards until the bag mouth of the ton bag is flush with the bottom of the weighing top plate. The output shaft of the first cylinder pushes the first connecting rod, and the first connecting rod pushes the rod portion, causing the hook to rotate around the axis of the shaft column. The hook first gradually approaches the ton bag along an arc trajectory, and then hooks and pulls out the sling on the ton bag, thereby hanging the sling.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machinery, and particularly relates to a negative-pressure type ton bag packaging machine. Background Art

[0002] At present, ultra-fine powders in China are generally filled in valve-mouth paper-plastic composite small bags, but in developed foreign countries, ton bags are already used for packaging and transportation. Valve-mouth paper-plastic composite small bags can only be used once and cannot be reused, and it is very difficult to deal with the recycled waste bags, which is not conducive to environmental protection; ton bags can be reused several times, which is conducive to environmental protection and saves national resources.

[0003] In order to solve the problem of "the domestic ultra-fine powder packaging is mainly manual packaging, which wastes working hours and is cumbersome", the Chinese patent with the publication number CN211223956U discloses a negative-pressure type ton bag packaging machine, specifically discloses that "it includes a sealed box body, top air claws, a lifting device, an external conveying device. The lifting device is arranged at the bottom inside the sealed box body, the top air claws are arranged at the top of the sealed box body, and the external conveying device is arranged at the front side of the front door of the sealed box body; a feed pipe and a vacuum extraction pipe are respectively connected to the top of the sealed box body, and a dust removal interface is arranged at the lower part of the rear side of the sealed box body." When hanging the sling on the ton bag through the top air claws, "the staff enters the sealed box body through the side door by means of a high platform and hangs the four slings on the ton bag on the claw bodies of the four top air claws respectively." Manual operation is required, which is very inconvenient. Therefore, the present application proposes a negative-pressure type ton bag packaging machine that can automatically hang the ton bag sling;

[0004] And the present invention also solves the following problems existing in the existing patent applications;

[0005] 1. A weighing device is provided in this application. The weighing device can weigh the entire sealed box body to control the stop of the filling process. Since the entire box body is weighed, various pipelines on the box body (oil pipelines and hydraulic pipelines of driving parts), as well as the remaining powder in the feed pipe are all uncertain quantities, and the overall self-weight is too large, which all have a great impact on the weighing result, resulting in inaccurate results. The present invention weighs the filling weight in real time through a weighing top plate and a weighing sensor. After reaching the set value, the filling automatically stops. The weighing components involved are few, only small components with a constant weight, and the self-weight is light, reducing uncertain quantities, thereby improving the accuracy of the weighing result;

[0006] 2. The lifting device in this application is arranged on the bottom wall of the box body. The lifting device is prone to dust accumulation and is not convenient for daily maintenance. The present invention arranges the lifting mechanism on the side wall of the outer shell, which is convenient for the staff to maintain and can also reduce dust accumulation, making the bottom space of the outer shell large and making it easier to clean the dust accumulated at the bottom;

[0007] 3. The external conveying device in this application has a complex structure. Since the front door in this application rotates around the door shaft to open, when the walking trolley moves to a certain distance in front of the front door, it has to wait for the front door to open first, and then the walking trolley continues to move forward, stops near the door part, and then can dock with the lifting device, which makes the control difficult and costly. The switchable door set in the present invention can open parallel to both sides, and a common conveying device (such as a belt conveyor) can be used to convey the ton bags. After the switchable door is opened, it can be directly docked with the lifting mechanism inside the housing, thereby reducing costs and control difficulty. Summary of the Invention

[0008] Based on the technical problems existing in the prior art, the present invention provides a negative pressure type ton bag packing machine.

[0009] A negative pressure type ton bag packing machine provided by the present invention includes a housing with a feed pipe at its top, an external conveying mechanism, a lifting mechanism, and a switchable door located in front of the housing. A weighing top plate with a weighing sensor installed inside is fixed on the inner wall of the top of the housing. A flexible hose communicating with the feed pipe is connected to the top of the weighing top plate. Hanging brackets are fixed at both the front and rear ends of the weighing top plate. The same shaft column is rotatably connected between the two ends of the hanging bracket. A hook for hanging the sling is fixedly sleeved on the shaft column. A rod portion is provided on the hook. A pair of first cylinders distributed oppositely are fixed on the top of the weighing top plate. The output shaft of the first cylinder is connected with a connecting member. The connecting member and the rod portion are rotatably connected by the same first connecting rod. The lifting mechanism lifts the ton bag upward until the bag opening of the ton bag is flush with the bottom of the weighing top plate. Then, the first cylinder is started. The output shaft of the first cylinder pushes the first connecting rod, and the first connecting rod pushes the rod portion, so that the hook rotates around the axis of the shaft column. The hook first gradually approaches the ton bag along an arc trajectory, and then hooks and pulls out the sling on the ton bag, so as to hang the sling.

[0010] Preferably, a pair of sliding grooves are opened at the bottom of the weighing top plate. A pair of supporting plates distributed oppositely are arranged below the weighing top plate. A sliding block integrally formed with the supporting plate and slidably connected with the sliding groove is provided at the top of the supporting plate. The supporting plate and the rod portion are rotatably connected by the same second connecting rod.

[0011] Preferably, a guiding portion integrally formed with the supporting plate is provided at the bottom end of the supporting plate. The two guiding portions are distributed in a V shape.

[0012] Preferably, the lifting mechanism is fixed on a lifting frame on the inner wall of the rear end of the housing. A guiding groove is opened on the lifting frame. A guiding block is slidably connected in the guiding groove. A lifting plate for lifting the ton bag is fixed at the front end of the guiding block. A screw rod threadedly connected with the guiding block is rotatably connected in the guiding groove. A first motor for driving the screw rod to rotate is fixed at the top end of the lifting frame.

[0013] Preferably, the switch door includes a pair of beams distributed up and down and fixed at the door of the outer shell, a pair of main shafts are rotatably connected between the two beams, a pair of connecting rods distributed up and down are fixedly sleeved on the main shafts, the other ends of the upper and lower connecting rods are rotatably connected to the same door panel, a pair of left-right symmetrical linkage rods are rotatably connected to the bottom of the upper beam, the other end of the linkage rods is rotatably connected to the corresponding door panel, and a mechanism for driving the main shaft to rotate is arranged on the upper beam.

[0014] Preferably, the mechanism for driving the main shaft to rotate comprises a pair of second cylinders distributed in opposite directions, the output shafts of the second cylinders are connected to racks, and the top fixed sleeve of the main shaft is provided with a gear that can be meshed with the racks.

[0015] Preferably, the external conveying mechanism is a belt conveyor arranged at the door of the shell for conveying the ton bag to the lifting plate.

[0016] Preferably, an installation groove is provided on the top of the lifting plate, and a plurality of laterally distributed conveying rollers are rotatably connected in the installation groove. Two pulleys are fixedly sleeved on one end of the conveying roller, and a belt sleeved on the two pulleys is provided between two adjacent conveying rollers. The two adjacent belts are staggered with each other, and a second motor is fixed on one side of the lifting plate, and the output shaft of the second motor is connected to the end of one of the conveying rollers.

[0017] Preferably, a pair of first seals and second seals are respectively provided on opposite sides of the two support plates, the first seals and the second seals are close together, the cross section of the second seal is convex, and the end of the first seal is provided with a sliding opening into which the end of the second seal can be inserted.

[0018] Preferably, a vacuum pipe is installed on the top of the shell, and a dust removal pipe is installed on the lower part of the rear end of the shell.

[0019] Compared with the prior art, the present invention provides a negative pressure ton bag packaging machine, which has the following beneficial effects:

[0020] 1. A negative pressure type ton bag packing machine. By setting a hook, the tray is placed on the external conveying mechanism, and then the ton bag is placed on the tray. The tray and the ton bag are conveyed to the lifting mechanism by the external conveying mechanism. Then the switch door is started and closed. The lifting mechanism lifts the ton bag upward until the bag mouth of the ton bag is flush with the bottom of the weighing top plate. Then the first cylinder is started. The output shaft of the first cylinder pushes the first connecting rod, and the first connecting rod pushes the rod part, so that the hook rotates around the axis of the shaft column. The hook first gradually pushes the ton bag inward along the arc track, and the pushed part of the ton bag sinks inward, forming a larger gap between the naturally hanging sling and the ton bag, so that the hook can pass through this gap. Then the sling on the ton bag is hooked and pulled outward to hang the sling. Then the filling of the ton bag starts. The weighing sensor weighs the filling weight in real time. After reaching the set value, the filling automatically stops. Then the first cylinder moves back to its original position, the hook rotates back to its original position, and the sling is released. The lifting mechanism drives the ton bag back to the initial height, the switch door is opened, and the ton bag and the tray are transferred to the external conveying mechanism and transported away.

[0021] 2. A negative pressure type ton bag packing machine. By setting a mouth-opening plate, when the rod part rotates outward, it pulls the second connecting rod, and the second connecting rod pulls the mouth-opening plate to move outward, so as to simultaneously use two mouth-opening plates to open the bag mouth of the ton bag and make the bag mouth stable, so as to reduce the overflow of dust.

[0022] 3. A negative pressure type ton bag packing machine. By setting an introduction part, since the two introduction parts are distributed in a V shape below the mouth-opening plate, a narrow-mouth structure can be formed. When the ton bag moves upward, the bag mouth is more likely to be sleeved between the two mouth-opening plates. And when the hook hooks the sling, the introduction part will not hinder the hook. And due to the setting of the introduction part, when the ton bag sinks inward, it will gradually fit on the surface of the introduction part, and the side of the ton bag will form a large range of inward inclination, rather than just forming a conical depression at the part in contact with the hook, so that the gap formed between the sling and the ton bag is larger and it is easier for the hook to pass through the gap and hook the sling.

[0023] 4. A negative pressure type ton bag packing machine. By setting a switch door, the output shafts of the two second cylinders both extend outward to push the rack to move. The rack meshes with and drives the gear to rotate. The gear synchronously drives the main shaft to rotate. The rotation directions of the two main shafts are opposite. The main shafts synchronously drive the connecting rod to rotate, so that the two door panels move to both sides respectively, and then the door opening is opened.

[0024] 5. A negative pressure type ton bag packing machine. By setting a first seal and a second seal, after the two mouth-opening plates open the bag mouth of the ton bag, both ends of the bag mouth of the ton bag will closely adhere to the mouth-opening plates, and both sides of the bag mouth will closely adhere to the first seal and the second seal. The end of the first seal is still inserted into the sliding opening, so that the bag mouth can be sealed more tightly, thereby effectively reducing the overflow of dust. Description of the Drawings

[0025] Figure 1 This is a schematic diagram of the overall structure of a negative pressure ton bag packaging machine proposed by the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the first angle of the interior of a negative pressure ton bag packaging machine proposed by the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the second angle inside a negative pressure ton bag packaging machine proposed by the present invention;

[0028] Figure 4 This is a first angle structural schematic diagram of a ton bag fixing process of a negative pressure ton bag packaging machine proposed by the present invention;

[0029] Figure 5 A second angle structural schematic diagram of a ton bag fixing process of a negative pressure ton bag packaging machine proposed by the present invention;

[0030] Figure 6 This is a schematic diagram of the support plate structure of a negative pressure ton bag packaging machine proposed by the present invention;

[0031] Figure 7 This is a structural schematic diagram of a lifting mechanism of a negative pressure ton bag packaging machine proposed by the present invention;

[0032] Figure 8 This is a schematic diagram of the switch door structure of a negative pressure ton bag packaging machine proposed by the present invention;

[0033] Figure 9 This is an enlarged structural schematic diagram of point A of a negative pressure ton bag packaging machine proposed by the present invention;

[0034] Figure 10 This is a schematic diagram of the enlarged structure of point B of a negative pressure ton bag packaging machine proposed by the present invention;

[0035] Figure 11 This is a schematic structural diagram of the cooperation between the first seal and the second seal of a negative pressure ton bag packaging machine proposed by the present invention;

[0036] Figure 12 This is a schematic diagram of the enlarged structure of point C of a negative pressure ton bag packaging machine proposed by the present invention.

[0037] In the figure: 1. Outer shell; 2. Weighing top plate; 3. Hanging rack; 4. Axial column; 5. Hook; 6. Rod part; 7. First connecting rod; 8. First cylinder; 9. Connecting piece; 10. Mouth-opening plate; 11. Import part; 12. Slide groove; 13. Slide block; 14. Second connecting rod; 15. Lifting frame; 16. Guide groove; 17. Screw rod; 18. Guide block; 19. Lifting plate; 20. First motor; 21. Door panel; 22. Beam plate; 23. Main shaft; 24. Connecting rod; 25. Linking rod; 26. Gear; 27. Second cylinder; 28. Rack; 29. Belt conveyor; 30. Installation groove; 31. Conveyor roller; 32. Belt pulley; 33. Belt; 34. Second motor; 35. Hose; 36. First seal; 37. Second seal; 38. Slide opening. Detailed implementation manner

[0038] 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 of the embodiments.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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 should not be construed as a limitation to the present invention.

[0040] Embodiment

[0041] Refer to Figures 1-12, a negative pressure type ton bag packing machine, including a housing 1 with a feed pipe at its top, an external conveying mechanism, a lifting mechanism, and a switch door located in front of the housing 1. A weighing top plate 2 with a weighing sensor installed inside is fixed to the inner wall of the top of the housing 1. A flexible hose 35 communicating with the feed pipe is connected to the top of the weighing top plate 2. Hanging brackets 3 are fixed to both the front and rear ends of the weighing top plate 2. A same shaft column 4 is rotatably connected between the two ends of the hanging bracket 3. A hook 5 for hanging the sling is fixedly sleeved on the shaft column 4. A rod portion 6 is provided on the hook 5. A pair of first cylinders 8 distributed oppositely are fixed to the top of the weighing top plate 2. The output shaft of the first cylinder 8 is connected with a connecting member 9. A same first connecting rod 7 is rotatably connected between the connecting member 9 and the rod portion 6. Place the pallet on the external conveying mechanism, then place the ton bag on the pallet. The external conveying mechanism conveys the pallet and the ton bag to the lifting mechanism. Then the switch door is started to close. The lifting mechanism lifts the ton bag upward until the bag mouth of the ton bag is flush with the bottom of the weighing top plate 2. Then start the first cylinder 8. The output shaft of the first cylinder 8 pushes the first connecting rod 7. The first connecting rod 7 pushes the rod portion 6, causing the hook 5 to rotate around the axis of the shaft column 4. The hook 5 gradually pushes the ton bag inward along an arc trajectory. The pushed part of the ton bag sinks inward, forming a larger gap between the naturally hanging sling and the ton bag, so that the hook 5 can pass through this gap. Then hook the sling on the ton bag and pull it outward to hang the sling. Then start filling the ton bag. The weighing sensor weighs the filling weight in real time. After reaching the set value, the filling automatically stops. Then, the first cylinder 8 moves back to its original position, and the hook 5 rotates back to its original position to release the sling. The lifting mechanism drives the ton bag back to the initial height. The switch door is opened, and the ton bag and the pallet are transferred to the external conveying mechanism and transported away.

[0042] Further, a pair of sliding grooves 12 are opened at the bottom of the weighing top plate 2. A pair of support plates 10 distributed oppositely are arranged below the weighing top plate 2. A slider 13 integrally formed with the support plate 10 and slidably connected to the sliding groove 12 is provided at the top of the support plate 10. A same second connecting rod 14 is rotatably connected between the support plate 10 and the rod portion 6. When the rod portion 6 rotates outward, it pulls the second connecting rod 14. The second connecting rod 14 pulls the support plate 10 to move outward, so as to simultaneously use the two support plates 10 to open the bag mouth of the ton bag and make the bag mouth stable, so as to reduce the overflow of dust.

[0043] Further, an introduction part 11 integrally formed with the bottom end of the mouth-opening plate 10 is provided. The two introduction parts 11 are distributed in a V shape. Since the two introduction parts 11 are distributed in a V shape below the mouth-opening plate 10, a narrow-mouth structure can be formed. When the ton bag moves upward, the bag mouth is more easily sleeved between the two mouth-opening plates 10. When the hook 5 hooks the sling, the introduction part 11 will not hinder the hook 5. And due to the setting of the introduction part 11, when the ton bag is indented inward, it will gradually fit onto the surface of the introduction part 11, and a large range of inward inclination will be formed on the side of the ton bag, rather than just a conical depression formed at the part in contact with the hook 5. Thus, a larger gap is formed between the sling and the ton bag, making it easier for the hook 5 to pass through the gap and hook the sling.

[0044] Further, the lifting mechanism is fixed to the lifting frame 15 on the inner wall at the rear end of the housing 1. A guide groove 16 is provided on the lifting frame 15. A guide block 18 is slidably connected in the guide groove 16. A lifting plate 19 for lifting the ton bag is fixed to the front end of the guide block 18. A screw rod 17 in threaded connection with the guide block 18 is rotatably connected in the guide groove 16. A first motor 20 for driving the screw rod 17 to rotate is fixed to the top end of the lifting frame 15. The output shaft of the first motor 20 drives the screw rod 17 to rotate, driving the guide block 18 and the lifting plate 19 to move upward along the guide groove 16 to lift the pallet and the ton bag upward.

[0045] Further, the switch door includes a pair of upper and lower beam plates 22 fixed at the door opening of the housing 1. A pair of main shafts 23 are rotatably connected between the two beam plates 22. A pair of upper and lower connecting rods 24 are fixedly sleeved on the main shafts 23. The other ends of the upper and lower connecting rods 24 are rotatably connected to the same door panel 21. A pair of left and right symmetrically distributed linkage rods 25 are rotatably connected to the bottom of the upper beam plate 22. The other ends of the linkage rods 25 are rotatably connected to the corresponding door panel 21. A mechanism for driving the main shaft 23 to rotate is provided on the upper beam plate 22. The mechanism for driving the main shaft 23 to rotate drives the two main shafts 23 to rotate in opposite directions respectively. The main shafts 23 synchronously drive the connecting rods 24 to rotate, causing the two door panels 21 to move to both sides respectively, thereby opening the door opening.

[0046] Further, the mechanism for driving the main shaft 23 to rotate includes a pair of second cylinders 27 distributed facing each other. The output shaft of the second cylinder 27 is connected to a rack 28. A gear 26 that can be meshed with the rack 28 is fixedly sleeved on the top end of the main shaft 23. The output shafts of the two second cylinders 27 both extend outward to push the rack 28 to move. The rack 28 meshes with and drives the gear 26 to rotate. The gear 26 synchronously drives the main shaft 23 to rotate. The rotation directions of the two main shafts 23 are opposite.

[0047] Further, the external conveying mechanism is a belt conveyor 29 arranged at the door opening of the housing 1 for conveying the ton bag to the lifting plate 19, and the ton bag is conveyed by the belt conveyor 29.

[0048] Furthermore, an installation groove 30 is formed at the top of the lifting plate 19. A plurality of horizontally distributed conveying rollers 31 are rotatably connected in the installation groove 30. Two belt pulleys 32 are fixedly sleeved at one end of each conveying roller 31. A belt 33 sleeved on the two belt pulleys 32 is arranged between two adjacent conveying rollers 31. The adjacent two belts 33 are mutually staggered. A second motor 34 is fixed on one side of the lifting plate 19. The output shaft of the second motor 34 is connected to the end of one of the conveying rollers 31. After the lifting plate 19 is reset to the initial height, the output shaft of the second motor 34 drives one of the conveying rollers 31 to rotate. Then, through the transmission cooperation of the plurality of belts 33 and the belt pulleys 32, the plurality of conveying rollers 31 rotate synchronously, and the filled ton bags are conveyed outwards to the external conveying mechanism.

[0049] Furthermore, a pair of first sealing strips 36 and second sealing strips 37 are respectively arranged on the opposite surfaces of the two bag-opening plates 10. The first sealing strips 36 and the second sealing strips 37 are closely adjacent to each other. The cross section of the second sealing strip 37 is convex. A sliding opening 38 into which the end of the second sealing strip 37 can be inserted is formed at the end of the first sealing strip 36. After the two bag-opening plates 10 open the mouth of the ton bag, both ends of the mouth of the ton bag will closely adhere to the bag-opening plates 10, and both sides of the mouth of the bag will closely adhere to the first sealing strips 36 and the second sealing strips 37. The end of the first sealing strip 36 is still inserted in the sliding opening 38, so that the mouth of the bag can be sealed more tightly, thereby effectively reducing the dust spillage.

[0050] Furthermore, a vacuum extraction pipe is installed at the top of the outer shell 1, and a dust removal pipe is installed at the lower part of the rear end of the outer shell 1. The vacuum extraction pipe is connected to a water ring vacuum pump outside. A vacuum pipeline switch butterfly valve and a vacuum pipeline pressure relief butterfly valve are installed on the vacuum extraction pipe. By controlling the corresponding butterfly valves, the water ring vacuum pump evacuates the inside of the sealed outer shell 1 to form a negative pressure, so that a constant negative pressure value is reached inside the outer shell 1. The pressure difference between the inside and outside of the outer shell 1 sucks the powder into the ton bag. The gas in the powder discharged from the surface of the ton bag remains in the ton bag. The dust removal pipe is connected to an external dust collector. After the packaging is completed, the dust inside the outer shell 1 can be collected by opening the dust collector.

[0051] 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, makes an equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A negative pressure type ton bag packing machine, comprising a housing (1) with a feed pipe at its top, an external conveying mechanism, a lifting mechanism, and a switch door located in front of the housing (1), characterized in that, A weighing top plate (2) with a weighing sensor installed inside is fixed to the inner wall of the top of the housing (1). A flexible hose (35) communicating with the feed pipe is connected to the top of the weighing top plate (2). Hanging brackets (3) are fixed to both the front and rear ends of the weighing top plate (2). A same shaft column (4) is rotatably connected between the two ends of the hanging bracket (3). A hook (5) for hanging the sling is fixedly sleeved on the shaft column (4). A rod portion (6) is provided on the hook (5). A pair of first cylinders (8) distributed oppositely are fixed to the top of the weighing top plate (2). The output shaft of the first cylinder (8) is connected with a connecting member (9). A same first connecting rod (7) is rotatably connected between the connecting member (9) and the rod portion (6). The lifting mechanism lifts the ton bag upwards until the bag mouth of the ton bag is flush with the bottom of the weighing top plate (2). Then, the first cylinder (8) is started. The output shaft of the first cylinder (8) pushes the first connecting rod (7). The first connecting rod (7) pushes the rod portion (6), causing the hook (5) to rotate around the axis of the shaft column (4). The hook (5) first gradually approaches the ton bag along an arc trajectory, and then hooks and pulls outwards the sling on the ton bag, thereby hanging the sling. A pair of chutes (12) are formed at the bottom of the weighing top plate (2). A pair of support plates (10) distributed oppositely are arranged below the weighing top plate (2). Sliders (13) integrally formed with the support plates (10) and slidably connected to the chutes (12) are provided on the tops of the support plates (10). A same second connecting rod (14) is rotatably connected between the support plates (10) and the rod portion (6). A pair of first seals (36) and second seals (37) are respectively provided on the opposite surfaces of the two support plates (10). The first seal (36) and the second seal (37) are closely adjacent to each other. The cross-section of the second seal (37) is convex-shaped. A sliding opening (38) into which the end of the second seal (37) can be inserted is formed at the end of the first seal (36).

2. The negative pressure type ton bag packing machine according to claim 1, characterized in that, An introduction portion (11) integrally formed with the support plate (10) is provided at the bottom end of the support plate (10). The two introduction portions (11) are distributed in a V shape.

3. The negative pressure type ton bag packing machine according to claim 1, characterized in that, The lifting mechanism is a lifting frame (15) fixed to the inner wall of the rear end of the housing (1). A guide groove (16) is formed in the lifting frame (15). A guide block (18) is slidably connected in the guide groove (16). A lifting plate (19) for lifting the ton bag is fixed to the front end of the guide block (18). A screw rod (17) in threaded connection with the guide block (18) is rotatably connected in the guide groove (16). A first motor (20) for driving the screw rod (17) to rotate is fixed to the top end of the lifting frame (15).

4. The negative pressure type ton bag packing machine according to claim 1, wherein, The switch door comprises a pair of beam plates (22) distributed vertically and fixed at the door opening of the housing (1); a pair of main shafts (23) are rotatably connected between the two beam plates (22); a pair of connecting rods (24) distributed vertically are fixedly sleeved on the main shafts (23); the other ends of the two connecting rods (24) are rotatably connected to the same door plate (21); a pair of left-right symmetrical linkage rods (25) are rotatably connected to the bottom of the upper beam plate (22); the other ends of the linkage rods (25) are rotatably connected to the corresponding door plate (21); and a mechanism for driving the main shaft (23) to rotate is provided on the upper beam plate (22).

5. The negative pressure type ton bag packing machine according to claim 4, characterized in that, The mechanism for driving the main shaft (23) to rotate comprises a pair of second cylinders (27) arranged in opposite directions, the output shaft of the second cylinder (27) is connected to a rack (28), and the top end of the main shaft (23) is fixedly sleeved with a gear (26) that can mesh with the rack (28).

6. The negative-pressure type ton bag packing machine according to claim 1, wherein The external conveying mechanism is a belt conveyor (29) arranged at the door of the housing (1) and used for conveying the ton bag to the lifting plate (19).

7. The negative pressure type ton bag packaging machine according to claim 3, characterized in that, The top of the lifting plate (19) is provided with a mounting groove (30), and a plurality of laterally distributed conveying rollers (31) are rotatably connected in the mounting groove (30), one end of the conveying roller (31) is fixedly sleeved with two pulleys (32), a belt (33) sleeved on the two pulleys (32) is provided between two adjacent conveying rollers (31), and the two adjacent belts (33) are staggered with each other, and a second motor (34) is fixed on one side of the lifting plate (19), and the output shaft of the second motor (34) is connected to the end of one of the conveying rollers (31).

8. A negative pressure type ton bag packing machine according to claim 1, characterized in that, A vacuum pipe is installed on the top of the shell (1), and a dust removal pipe is installed at the lower part of the rear end of the shell (1).

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