Automatic nesting mechanism for inner bag and outer bag of market bag

Abstract

The invention discloses a market bag inner bag and outer bag automatic nesting mechanism which comprises an outer bag conveying mechanism, an outer bag opening mechanism, an inner bag conveying mechanism and a cutting mechanism, the outer bag conveying mechanism is arranged on the ground, the outer bag opening mechanism is arranged above the outer bag conveying mechanism, the inner bag conveying mechanism is arranged on one side of the outer bag opening mechanism, and the cutting mechanism is arranged on the other side of the outer bag opening mechanism. A cutting mechanism is arranged between the inner bag conveying mechanism and the outer bag opening mechanism; the inner bag can be conveniently and automatically placed into the outer bag, bagging is completed, and the situation that the inner bag is deposited between the end of the outer bag and the inner bag conveying mechanism due to the fact that the inner bag is not placed into the outer bag is avoided.

Description

Technical Field

[0001] This invention relates to the field of automated processing equipment for market bags, specifically designing an automated nesting mechanism for the inner and outer bags of a market bag. Background Art

[0002] Market bags are generally used for packaging feed and fertilizer. In order to prevent the feed and fertilizer in the bag from getting damp, an inner bag is needed inside the outer bag to prevent the leakage of odor and dust, and at the same time to prevent moisture.

[0003] Previously, inner bag nesting mainly used two opposing rollers, with upper and lower sets of air jets to assist in the inner bag being inserted into the outer bag. However, the above-mentioned inner bag nesting mechanism has the following drawbacks: when the bag is not opened during inner bag nesting, it will cause the inner bag to accumulate and become blocked. This requires cleaning the inner bag before the next inner bag nesting can be performed. At the same time, if the outer bag and inner bag are misaligned, blockage will also occur, which requires machine shutdown for maintenance and delays in production time.

[0004] At the same time, when the inner bag end face is pressed against the outer bag end face, it will also cause the inner bag to block the outer bag end face. In this case, the inner bag cannot be inserted into the outer bag and there is no need to clean it.

[0005] Both of the above situations require shutdown for maintenance, which reduces production efficiency and necessitates frequent equipment maintenance by staff. Summary of the Invention

[0006] To address the shortcomings of the existing technology, this invention proposes an automatic nesting mechanism for the inner and outer bags of a market bag, which facilitates the direct insertion of the inner bag into the outer bag and avoids the inner bag accumulating between the end of the outer bag and the inner bag conveying mechanism if the inner bag is not inserted into the outer bag.

[0007] To achieve the above objectives, the present invention provides an automatic nesting mechanism for an inner and outer bag of a market bag, comprising an outer bag conveying mechanism, an outer bag opening mechanism, an inner bag conveying mechanism, and a cutting mechanism. The outer bag conveying mechanism is disposed on the ground, the outer bag opening mechanism is disposed above the outer bag conveying mechanism, the inner bag conveying mechanism is disposed on one side of the outer bag opening mechanism, and the cutting mechanism is disposed between the inner bag conveying mechanism and the outer bag opening mechanism. A conveyor belt is installed on the top surface of the outer bag conveying mechanism. A swingable stop is set on the outer bag conveying mechanism. The stop is located at the front end of the outer bag opening mechanism. A negative pressure hole is opened on the conveyor belt. A negative pressure chamber is installed below the conveyor belt. The top of the negative pressure chamber is in close contact with the inner wall of the conveyor belt. The negative pressure chamber is connected to a negative pressure pump. A tensioning module is installed between the inner bag conveying mechanism and the cutting mechanism to tension both sides of the inner bag. When the inner bag is conveyed, the tensioning module releases the bag body. A probe capable of lifting and lowering is installed at the top of the outer bag opening mechanism, and the probe passes through the outer bag opening mechanism. A support plate is installed at the bottom of the probe to contact the top of the outer bag. When the top of the outer bag is not attracted by the outer bag opening mechanism and the bag body is not opened, the probe descends, and the inner bag conveying mechanism stops conveying.

[0008] Preferably, the outer bag opening mechanism includes an opening mounting frame, a negative pressure suction head, and a lifting assembly. The opening mounting frame is positioned directly above the outer bag conveying mechanism. Multiple negative pressure suction heads are positioned vertically opposite each other at the bottom of the opening mounting frame and the top of the outer bag conveying mechanism. The lifting assembly is positioned between the opening mounting frame and the outer bag conveying mechanism. Multiple sets of vertically arranged sleeves are provided on the opening mounting frame. Probes that move up and down along the sleeves are inserted into the sleeves. Multiple sets of proximity switches are installed on the top of the opening mounting frame. Each proximity switch is located on one side of a corresponding probe. A trigger block for triggering the proximity switch is installed on the top of the probe. The trigger switch is connected to a controller, and the controller is connected to the inner bag conveying mechanism.

[0009] Preferably, the outer bag conveying mechanism is provided with two opposing swing plates. The swing plates are mounted on the top surface of the outer bag conveying mechanism by rotational engagement. The swing plates are located on both sides of the cutting mechanism and are linked with the cutting mechanism. Two oblong holes are opened on the top surface of the outer bag conveying mechanism. A rotating shaft is fixed to the bottom of one end of the swing plate. The rotating shaft slides in the oblong holes and can also rotate. A rack is installed on the inner wall of one side of the oblong holes. A gear that meshes with the rack is installed on the rotating shaft. A cylinder coaxial with the rotating shaft is fixed to the top of the swing plate. A ring is fitted on the cylinder. A limiting plate is fixed to the top of the cylinder to prevent the ring from detaching. A connecting rod is hinged between the ring and the cutting mechanism. When the cutting mechanism rises, the cylinder is pulled towards the cutting mechanism through the connecting rod. In this way, the swing plates swing outward, and the two swing plates form a trumpet-shaped inclined opening.

[0010] Preferably, the inner bag conveying mechanism includes a roll, conveying rollers, and air jet components. A frame is placed on the ground, and a roll containing the inner bag is installed on the frame. Two conveying rollers, arranged vertically, are installed on the frame near the side of the roll close to the outer bag conveying mechanism. Each conveying roller is driven by a conveying motor. When a proximity switch is triggered, the conveying motor stops working, and the outer walls of the two conveying rollers are in contact. Two sets of air jet components are arranged between the conveying rollers and the cutting mechanism. The two sets of air jet components are located on the upper and lower sides of the inner bag, respectively, and the air jet components are parallel to the direction of inner bag conveying.

[0011] Preferably, a tensioning module is provided between the conveyor roller and the cutting mechanism to tension both sides of the inner mold. The tensioning module is divided into two groups, and the two groups of tensioning modules are located on both sides of the inner bag. Each group of tensioning modules includes a swing arm and a pressing wheel. Each group of tensioning modules consists of two swing arms, which are installed on both sides of the frame by rotational engagement. A linkage component is provided between the swing arm and the conveyor roller. A pressing wheel is installed at the other end of each swing arm. A sliding rod is installed on the central axis of the pressing wheel. The sliding rod passes through the swing arm and slides along the swing arm. A first electric push rod is provided between the sliding rod and the swing arm. The extension and retraction of the first electric push rod drives the translation of the sliding rod. A limit switch and a trigger plate are respectively provided on the inner side of the two swing arms. When the two pressing wheels are in contact, the limit switch is triggered, the first electric push rod is lifted, and the sliding rod moves outward.

[0012] Preferably, two vertical grooves are cut into the frame, and two sliding seats arranged vertically opposite each other are inserted into each groove. The two ends of the conveying roller are mounted on the sliding seats through bearings. The linkage component is the linkage rod, and a sliding sleeve is fitted on the linkage rod. The sliding sleeve is fixed to the frame. A pull rod is hinged between the linkage rod, the sliding seat, and the swing arm. A second electric push rod is set between the linkage rod and the frame. The sliding seat moves closer and the swing arm closes through the second electric push rod. The second electric push rod and the trigger switch are connected to and communicate with the controller.

[0013] Preferably, the outer bag conveying mechanism is a flat plate with a groove for mounting a belt, the top of which is flush with the top of the plate. Negative pressure holes are evenly spaced on the outer wall of the belt, and a negative pressure cavity is located inside the belt. The top of the negative pressure cavity is open and fits against the inner side of the belt. When the negative pressure holes move to the position of the negative pressure cavity, they connect and attract the outer bag, allowing the outer bag to move synchronously with the belt. A groove is formed on the flat plate, and a stop block is hinged within the groove. When the stop block swings down, its top surface is lower than the top surface of the flat plate, and one end of the stop block is connected to one end of the groove. One end is rotated and connected, and the other end of the stop block is hinged to the bottom of the groove by a cylinder. The cylinder swings the stop block upward. A trigger component is installed on the top surface of the stop block. When the edge of the outer bag abuts against the stop block, the trigger component is triggered, the cylinder retracts, and the stop block swings back into the groove. A through-beam photoelectric sensor is installed above and on the plate. The through-beam photoelectric sensor is located in front of the stop block and is connected to the cylinder. When the through-beam photoelectric sensor is in the interrupted state, the cylinder rises, and the stop block blocks the bag. The stop block is located in front of the negative pressure chamber.

[0014] Compared with the prior art, the advantages of the present invention are: it facilitates the automatic insertion of the inner bag into the outer bag, thus completing the bagging process and avoiding the accumulation of the inner bag between the end of the outer bag and the inner bag conveying mechanism due to the inner bag not being inserted into the outer bag. Attached Figure Description

[0015] Figure 1 It is a top view of the present invention.

[0016] Figure 2 This is a perspective view of the present invention.

[0017] Figure 3 This is a cross-sectional view of the outer bag conveying mechanism of the present invention.

[0018] Figure 4 This is a schematic diagram of the inner bag conveying mechanism of the present invention.

[0019] Figure 5 This is a schematic diagram showing the positions of the conveying roller, linkage assembly, and tensioning module of the present invention.

[0020] Figure 6 This is a schematic diagram of the cutting mechanism and the outer bag opening mechanism of the present invention.

[0021] Figure 7 This is a schematic diagram of the cutting mechanism and the opening mounting frame of the present invention.

[0022] Figure 8 This is a schematic diagram of the swing plate, gear, and rack of the present invention.

[0023] Figure 9 This is a perspective view of the mounting frame and flat plate of the present invention.

[0024] Figure 10 The left view shows the mounting bracket and the flat plate of this invention.

[0025] Figure 11 This is a schematic diagram of the swing arm of the present invention.

[0026] The components include: 1. Outer bag conveying mechanism; 2. Conveyor belt; 3. Stop block; 4. Trigger assembly; 5. Negative pressure hole; 6. Negative pressure chamber; 7. Negative pressure pump; 8. Flat plate; 9. Groove; 10. Through-beam photoelectric sensor; 11. Outer bag opening mechanism; 12. Probe; 13. Sleeve; 14. Proximity switch; 15. Trigger block; 16. Opening mounting bracket; 17. Negative pressure suction head; 18. Lifting assembly; 19. Support plate; 20. Swinging plate; 21. Waist-shaped hole; 22. Rotating shaft; 23. Rack and pinion. 24. Gear, 25. Cylinder, 26. Ring, 27. Limiting plate, 28. Connecting rod, 29. Inner bag conveying mechanism, 30. Roller, 31. Conveying roller, 32. Air jet assembly, 33. Frame, 34. Tensioning module, 35. Swing arm, 36. Pressing wheel, 37. Sliding rod, 38. Linkage assembly, 39. Linkage rod, 40. Limit switch, 41. Trigger plate, 42. Cutting mechanism, 43. Slide groove, 44. Sliding seat, 45. Sliding sleeve, 46. Pull rod. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] like Figure 1-11 The aforementioned automatic nesting mechanism for inner and outer bags of a market bag includes an outer bag conveying mechanism 1, an outer bag opening mechanism 11, an inner bag conveying mechanism 29, and a cutting mechanism 42. The outer bag conveying mechanism 1 is bolted to the ground and conveys the bag from front to back. The outer bag opening mechanism 11 is positioned above the outer bag conveying mechanism 1, located in the middle section of the outer bag conveying mechanism 1. The inner bag conveying mechanism 29 is positioned on the ground to the left of the outer bag opening mechanism 11. The cutting mechanism 42 is positioned between the inner bag conveying mechanism 29 and the outer bag opening mechanism 11. The cutting mechanism 42 includes a cutting blade, an eccentric wheel, and a ring. A vertical cutting blade is positioned above the left edge of the outer bag conveying mechanism 1. Vertical guide grooves are provided on both the front and rear sides of the cutting blade, allowing for vertical lifting and lowering of the cutting blade. When the cutting blade lowers... When the cutting blade contacts the top surface of the outer bag conveying mechanism 1, it cuts the inner bag. The top of the vertical guide groove is fixed to the left edge of the outer bag conveying mechanism 1 by bolts. A rocker arm is hinged to the top of the cutting blade, and the top of the rocker arm is hinged to a ring. The ring is fitted onto an eccentric wheel. The cutting motor drives the eccentric wheel to rotate, and the cutting blade is raised and lowered by the rotation of the eccentric wheel. The above-mentioned cutting mechanism 42 is the prior art. During operation, the outer bag conveying mechanism 1 conveys the outer bag to the bottom of the outer bag opening mechanism 11. The outer bag opening mechanism 11 rises and opens the bag body, so that the inner bag can be embedded into the outer bag, thus forming a market bag with inner and outer bags. When the bag body is open, the inner bag is conveyed into the outer bag by the inner bag conveying mechanism 29. After the inner bag is conveyed into the outer bag, the inner bag is cut by the cutting mechanism 42. The outer bag conveying mechanism 1 conveys the outer bag with the inner bag inserted backward.

[0029] The top of the outer bag conveying mechanism 1 is a smooth plane with a groove. A conveyor belt 2 is installed on the top surface of the outer bag conveying mechanism 1 and is embedded in the groove. The top of the conveyor belt 2 is flush with the top surface of the outer bag conveying mechanism 1. The outer bag is placed at the front end of the outer bag conveying mechanism 1, with the bottom of the outer bag in contact with the top surface of the conveyor belt 2. The outer bag is conveyed backward by the conveyor belt 2. A groove 9 is opened on the top surface of the outer bag conveying mechanism 1. There are multiple swingable stops 3 on the outer bag conveying mechanism 1. When the stops 3 are placed in the groove 9, the top of the stops 3 is higher than the top surface of the outer bag conveying mechanism 1, thus blocking the outer bag and preventing the front and rear edges of the outer bag from tilting. It also limits the position of the outer bag. The stops 3 are located at the front end of the outer bag opening mechanism 11. A negative pressure hole 5 is opened on the conveyor belt 2. After the outer bag is aligned, the negative pressure hole 5 on the conveyor belt 2 opens to the bottom of the outer bag. The outer bag is adsorbed, and the outer bag moves synchronously with the conveyor belt 2. A negative pressure chamber 6 is installed below the conveyor belt 2, and the top of the negative pressure chamber 6 is in close contact with the upper inner wall of the conveyor belt 2. When the outer bag is conveyed backward by the conveyor belt 2, if the outer bag is tilted, the rear edge of the outer bag will contact the stop block 3 and stop conveying backward. When the other side also contacts the stop block 3, the stop block 3 swings downward to make way for the bag, so that the tilted bag becomes upright. At the same time, the position of the bag is limited by the stop block 3. When the negative pressure hole 5 moves to the front of the stop block 3, the negative pressure hole 5 is connected to the negative pressure chamber 6. In this way, the negative pressure hole 5 is in a negative pressure state, and the negative pressure hole 5 adsorbs the bottom of the outer bag. In this way, the outer bag is conveyed backward synchronously with the conveyor belt 2. This can prevent the bag from tilting when the outer bag is placed into the inner bag, which would affect the placement of the inner bag. At the same time, it can prevent the outer bag and the conveyor belt 2 from sliding relative to each other during subsequent conveying, which would cause misalignment of the inner and outer bags when nested.

[0030] A tensioning module 34 is provided between the inner bag conveying mechanism 29 and the cutting mechanism 42 to tension both sides of the inner bag. When the inner bag is conveyed, the tensioning module 34 loosens the bag body. When the inner bag is not tensioned by the tensioning module 34, the end of the inner bag droops downward due to gravity. This causes the right end face of the inner bag to press against the left end face of the outer bag during conveying, preventing the inner bag from being conveyed into the outer bag. As a result, the inner bag folds between the cutting mechanism 42 and the outer bag, requiring the machine to be stopped and cleaned before restarting. The tensioning module 34 of this application opens the bag body, which can prevent the bag body from drooping and also prevent the inner bag body from opening. This ensures that the upper and lower edges of the inner bag are within the range of the outer bag opening, preventing the inner bag from being unable to be placed into the outer bag.

[0031] A movable probe 12 passes through the top of the outer bag opening mechanism 11. A support plate 19, which contacts the top of the outer bag, is bolted to the bottom of the probe 12. The support plate 19 primarily prevents the probe 12 from puncturing the bag. When the top of the outer bag is not attracted by the outer bag opening mechanism 11 and the bag is not opened, the probe 12 descends, thus stopping the inner bag conveying mechanism 29. During the process of inserting the inner bag into the outer bag, if the outer bag is not open, the inner bag cannot be inserted. The probe 12 of this application can move up and down; when the outer bag... When the top of the outer bag does not rise with the outer bag opening mechanism 11, the probe 12 descends under the action of gravity, thus triggering the probe 12 and stopping the inner bag conveying mechanism 29 from conveying the inner bag. When the top of the outer bag opens upward with the outer bag opening mechanism 11, the bottom of the tray 19 abuts against the top of the outer bag, thus preventing the probe 12 from descending and triggering it, and the inner bag is conveyed. During the insertion of the inner bag into the outer bag, when the top of the outer bag separates from the outer bag opening mechanism 11, the probe 12 descends rapidly, thus triggering the probe 12 and stopping the inner bag conveying.

[0032] The outer bag opening mechanism 11 includes an opening mounting frame 16, negative pressure suction heads 17, and a lifting assembly 18. The opening mounting frame 16, which is an I-beam frame, is positioned above the outer bag conveying mechanism 1. Multiple negative pressure suction heads 17 are bolted to the bottom of the opening mounting frame 16 and the top of the outer bag conveying mechanism 1, arranged vertically opposite each other. The negative pressure suction heads 17 are connected to a negative pressure air pump, whose switch is connected to a controller. When the opening mounting frame 16 descends and presses against the top surface of the outer bag conveying mechanism 1... When the inner bag is nested, the negative pressure air pump stops working, the negative pressure suction head 17 releases the negative pressure, and the outer bag falls. A lifting assembly 18, which is a cylinder, is installed between the opening mounting frame 16 and the outer bag conveying mechanism 1. The cylinder is connected to a controller via a valve, and the controller controls the extension and retraction of the cylinder. The cylinder body and piston rod are respectively bolted to the top surfaces of the opening mounting frame 16 and the outer bag conveying mechanism 1. The extension and retraction of the cylinder controls the lifting and lowering of the opening mounting frame 16. When the opening mounting frame 16 rises, the negative pressure suction head 17 adsorbs the outer wall of the outer bag, thus opening the outer bag. Multiple sets of vertically arranged sleeves 13 are fixed to the opening mounting frame 16 by welding. Probes 12, which move vertically along the sleeves 13, are inserted into the sleeves 13. Two sets of proximity switches 14 (model SN04-P) are bolted to the top of the opening mounting frame 16. Each set of proximity switches 14 is located on one side of a corresponding probe 12. The top of each probe 12 is secured with bolts. A trigger block 15 is installed in a fastening manner to trigger the proximity switch 14. The trigger switch is connected to the inner bag conveying mechanism 29 through a controller, which is a PLC controller. When the opening mounting frame 16 rises, if the negative pressure suction head 17 on the opening mounting frame 16 adsorbs the opening of the outer bag, the probe 12 cannot descend. When the negative pressure suction head 17 on the opening mounting frame 16 separates from the outer bag, the tray 19 is not supported by the outer bag. In this way, the probe 12 descends due to its own gravity, which will trigger the proximity switch 14.

[0033] Two opposing swing plates 20 are installed on the outer bag conveying mechanism 1. The swing plates 20 are mounted on the outer bag conveying mechanism 1 by rotational engagement. The swing plates 20 are located on the front and rear sides of the cutting mechanism 42 and are linked with the cutting mechanism 42. When the cutting mechanism 42 rises, the swing plates 20 form a flared opening. When the cutting mechanism 42 descends, the two swing plates 20 are parallel to each other, making way for the outer bag conveying. Two parallel waist-shaped holes are opened on the top surface of the outer bag conveying mechanism 1. 21. The oblong hole 21 is located on the right side of the cutting mechanism 42. A rotating shaft 22 is fixed to the bottom of one end of the swing plate 20 by welding. The rotating shaft 22 is inserted into the oblong hole 21 and slides left and right within the oblong hole. The rotating shaft 22 is a truncated cone with a smaller top and a larger bottom, and the oblong hole 21 is also narrower at the top and wider at the bottom. This allows the rotating shaft 22 to be locked in the oblong hole 21 and also to rotate, thus enabling the swing plate 20 to swing. A [missing information - likely a device or component] is installed on the inner wall of one side of the oblong hole 21 by welding. A rack 23 has a gear 24 welded to it on a rotating shaft 22. When the rotating shaft 22 moves left or right, the swing plate 20 deflects. A cylinder 25, coaxial with the rotating shaft 22, is welded to the top of the swing plate 20. A ring 26 is fitted on the cylinder 25, and the ring 26 rotates relative to the cylinder 25. A limiting plate 27 is welded to the top of the cylinder 25 to prevent the ring 26 from disengaging. A hinge is formed between the ring 26 and the cutting mechanism 42. When the cutting mechanism 42 rises, the connecting rod 28 pulls the cylinder 25 toward the cutting mechanism 42, causing the swing plate 20 to swing inward. The two swing plates 20 form a flared inclined opening to prevent the front and rear sides of the inner bag from pressing against the end face of the outer bag, making it easier to embed the inner bag into the outer bag. When the cutting mechanism 42 descends to cut, the connecting rod 28 pushes the cylinder 25 outward, and the swing rod swings inward. The two stops 3 are located on the same plane, making way for the bag body conveyed by the outer bag conveying mechanism 1.

[0034] The inner bag conveying mechanism 29 includes a drum 30, conveying rollers 31, and an air jet assembly 32. A frame 33 is placed on the ground, with its bottom secured to the ground by bolts. A drum 30 containing an inner bag is mounted on the left end of the frame 33 via bearings. The drum 30 supplies the inner bag by unwinding. Two vertically arranged conveying rollers 31 are mounted on the frame 33 near the side of the drum 30 closest to the outer bag conveying mechanism 1. Each conveying roller 31 is driven by a conveying motor. The two conveying rollers 31 clamp the inner bag. When the conveying motor is running, the conveying rollers 31 rotate to convey the inner bag to the right. The motor's switch is connected to the PLC controller. The output terminal is connected, and the proximity switch 14 is connected to the input terminal of the PLC controller. When the proximity switch 14 is triggered, the conveyor motor stops working. Two sets of air jet components 32 are set on the frame 33 between the conveyor roller 31 and the cutting mechanism 42. The two sets of air jet components 32 are located on the upper and lower sides of the inner bag respectively, and the air jet components 32 are parallel to the conveying direction of the inner bag. Each set of air jet components 32 is a set of multiple air jet pipes arranged side by side. The air jet pipes are connected to the air pump. When the inner bag is conveyed, the upper and lower sides of the inner bag are ventilated. This is mainly to assist the inner bag in conveying inside the outer bag and to avoid the inner bag from contacting the outer bag during the conveying process.

[0035] A tensioning module 34 is installed on the frame 33 between the conveyor roller 31 and the cutting mechanism 42. The tensioning module 34 tensions the inner mold on both sides front and back. The tensioning module 34 is divided into two groups, and the two groups of tensioning modules 34 are located on the front and back sides of the inner bag. Each group of tensioning modules 34 includes a swing arm 35 and a pressing wheel 36. Each group of tensioning modules 34 has two swing arms 35, which are arranged vertically. The swing arms 35 are installed on the side walls of the frame 33 by hinge. A linkage component 38 is provided between the swing arm 35 and the conveyor roller 31. When the conveyor roller 31 starts to convey the inner bag, the tensioning module 34 releases the inner bag without affecting the conveying of the inner bag. One end of each swing arm 35 is hinged to the frame 33, and a pressing wheel 36 is installed at the other end of each swing arm 35. A sliding rod 37 is installed on the central axis of the pressing wheel 36 by welding. The sliding rod 37 slides through the swing arm 35. The boom 35 slides, and a first electric push rod is installed between the sliding rod 37 and the swing arm 35 by bolts. A limit switch 40 and a trigger plate 41 are fixed to the inner side of the two swing arms 35 by bolts. When the two pressing wheels 36 are in contact, the limit switch 40 and the trigger plate 41 are in contact, and the limit switch 40 is triggered. The limit switch 40 is model LX19-001 / 111. Since the limit switch 40 is connected to the input terminal of the PLC controller, and the switch of the first electric push rod is connected to the output terminal of the PLC controller, the first electric push rod is raised, so the sliding rod 37 moves outward. When the inner bag stops conveying, the swing arm 35 approaches, and the pressing wheels 36 clamp the two sides of the inner bag. At the same time, the limit switch is triggered, and the first electric push rod is raised. In this way, the first electric push rod pushes the sliding rod 37 outward, and the pressing wheels 36 move outward, thus tightening the inner bag and preventing the inner bag opening from drooping or opening.

[0036] Vertical grooves 43 are formed on both the front and rear sides of the frame 33. Two sliding seats 44, arranged vertically opposite each other, are inserted into the grooves 43. The sliding seats 44 move up and down within the grooves 43. The two ends of the conveying roller 31 are mounted on the sliding seats 44 via bearings. The linkage component 38 is the linkage rod 39. Sliding sleeves 45 are fitted on both ends of the linkage rod 39. The linkage rod 39 slides laterally left and right along the sliding sleeves 45. The sliding sleeves 45 are fixed to the frame 33 by bolts. A pull rod 46 is hinged between the linkage rod 39, the sliding seats 44, and the swing arm 35. When the linkage rod 39 moves left and right, the sliding seats... 44 moves closer and separates, and the swing arm 35 also moves closer and separates. The linkage rod 39 and the frame 33 are fixed with a second electric push rod by bolts. The push rod of the second electric push rod is welded to the linkage rod 39. The linkage rod 39 moves left and right through the second electric push rod. When the linkage rod 39 moves to the left, the two sliding seats 44 move closer and the swing arm 35 closes. The switch of the second electric push rod is connected to the output terminal of the PLC controller. The inner bag is conveyed through the PLC controller. The second electric push rod can be lifted at timed intervals to realize the quantitative conveying of the inner bag and realize the linkage between the conveying roller 31 and the tensioning module 34.

[0037] The outer bag conveying mechanism 1 is a flat plate 8. Negative pressure holes 5 are evenly spaced on the outer wall of the belt. A negative pressure chamber 6 is located on the inner side of the belt, with an open top that fits against the inner side of the belt. When the negative pressure holes 5 move to the position of the negative pressure chamber 6, they connect and attract the outer bag, allowing the outer bag to move with the belt. A groove 9 is located at the front end of the flat plate 8, and a stop block 3 is hinged within the groove 9. When the stop block 3 swings down, its top surface is lower than the top surface of the flat plate 8, and one end of the stop block 3 rotates with one end of the groove 9. The other end of the stop block 3 is hinged to the bottom of the groove 9 via a cylinder. The cylinder causes the stop block 3 to swing upwards, protruding from the plate 8 and perpendicular to it. Taking the stop block 3 retracting into the groove 9 as an example, a trigger assembly 4 is installed on the top surface of the stop block 3. The trigger assembly 4 is a pressure sensor, and two pressure sensors are connected to the input terminals of the PLC controller. The pressure sensors are HPT510 thin matrix solid-state pressure sensors. When the stop block 3 protrudes from the plate 8, the pressure sensor position... On the front side of the stop block 3, when the edge of the outer bag abuts against the stop block 3, the trigger component 4 is triggered by pressure. When both pressure sensors are triggered, the cylinder retracts, and the stop block 3 retracts into the groove 9. The transmitter of the through-beam photoelectric sensor 10 is mounted on the plate 8 via a gantry frame. A circular hole is opened on the plate 8, and the receiver of the through-beam photoelectric sensor 10 is installed in the circular hole. The through-beam photoelectric sensor 10 is a through-beam photoelectric sensor BS5-L1M. The through-beam photoelectric sensor 10 is located on the stop block. In front of position 3, the photoelectric sensor 10 is connected to the cylinder. When the photoelectric sensor 10 is in an interrupted state, the cylinder is lifted, and the stop block 3 blocks the bag. The stop block 3 is located in front of the negative pressure chamber 6. After alignment, the stop block 3 swings downward to make way for the outer bag conveyor. At the same time, the negative pressure hole 5 of the conveyor belt 2 also moves to the front of the stop block 3. The rear edge of the negative pressure hole 5 is flush with the front side of the baffle. When the negative pressure hole 5 moves to the negative pressure chamber 6, the negative pressure hole 5 adsorbs the outer bag to achieve synchronous conveying and avoid misalignment during the conveying process.

Claims

1. An automatic nesting mechanism for inner and outer bags of market bags, comprising an outer bag conveying mechanism, an outer bag opening mechanism, an inner bag conveying mechanism and a cutting mechanism, wherein the outer bag conveying mechanism is arranged on the ground, the outer bag opening mechanism is arranged above the outer bag conveying mechanism, the inner bag conveying mechanism is arranged on one side of the outer bag opening mechanism, and the cutting mechanism is arranged between the inner bag conveying mechanism and the outer bag opening mechanism; It is characterized in that A conveyor belt is installed on the top surface of the outer bag conveying mechanism, a swingable stopper is arranged on the outer bag conveying mechanism, the stopper is located at the front end of the outer bag opening mechanism, a negative pressure hole is opened on the conveyor belt, a negative pressure cavity is installed below the conveyor belt, the top of the negative pressure cavity is in close contact with the inner wall of the conveyor belt, and the negative pressure cavity is connected to the negative pressure pump; A tensioning module for tensioning both sides of the inner bag is arranged between the inner bag conveying mechanism and the cutting mechanism. When the inner bag is conveyed, the tensioning module loosens the bag body. A probe that can be raised and lowered is arranged on the top of the outer bag opening mechanism and passes through the outer bag opening mechanism. A support plate that contacts the top of the outer bag is arranged at the bottom of the probe. When the top of the outer bag is not adsorbed by the outer bag opening mechanism and the bag body is not opened, the probe descends, so that the inner bag conveying mechanism stops conveying.

2. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 1, characterized in that: The outer bag opening mechanism includes an opening mounting frame, a negative pressure suction head and a lifting assembly. The opening mounting frame is arranged directly above the outer bag conveying mechanism. A plurality of negative pressure suction heads arranged opposite to each other up and down are arranged at the bottom of the opening mounting frame and the top of the outer bag conveying mechanism. A lifting assembly is arranged between the opening mounting frame and the outer bag conveying mechanism. A plurality of groups of vertically arranged sleeves are arranged on the opening mounting frame, and probes which are lifted and lowered along the sleeves are inserted into the sleeves. A plurality of groups of proximity switches are installed on the top of the opening mounting frame, and each group of proximity switches is located on one side of the corresponding probe. A trigger block for triggering the proximity switch is installed on the top of the probe. The trigger switch is connected to a controller, and the controller is connected to the inner bag conveying mechanism.

3. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 2, characterized in that: The outer bag conveying mechanism is provided with two swinging plates arranged opposite to each other. The swinging plates are installed on the top surface of the outer bag conveying mechanism by means of rotational cooperation. The swinging plates are located on both sides of the cutting mechanism. The swinging plates are linked with the cutting mechanism. Two waist-shaped holes are opened on the top surface of the outer bag conveying mechanism. A rotating shaft is fixed at the bottom of one end of the swinging plate. The rotating shaft slides in the waist-shaped hole and can also rotate at the same time. A rack is installed on the inner wall of one side of the waist-shaped hole, and a gear meshing with the rack is installed on the rotating shaft. A cylinder coaxial with the rotating shaft is fixed on the top of the swinging plate, a ring is sleeved on the cylinder, and a limit plate is fixed on the top of the cylinder to prevent the ring from detaching. A connecting rod is hinged between the ring and the cutting mechanism. When the cutting mechanism rises, the cylinder is pulled toward the cutting mechanism through the connecting rod, so that the swinging plate swings outward, and the two swinging plates form a trumpet-shaped inclined mouth.

4. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 3, characterized in that: The inner bag conveying mechanism includes a reel, a conveying roller and an air jet assembly, wherein a frame is placed on the ground, a reel with the inner bag is mounted on the frame, and two upper and lower conveying rollers are mounted on the frame on the side of the reel close to the outer bag conveying mechanism, each conveying roller is driven by a conveying motor, when the proximity switch is triggered, the conveying motor stops working, and the outer walls of the two conveying rollers are fitted together, and two upper and lower sets of air jet assemblies are arranged between the conveying roller and the cutting mechanism, and the two sets of air jet assemblies are respectively located on the upper and lower sides of the inner bag and the air jet assemblies are parallel to the conveying direction of the inner bag.

5. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 4, characterized in that: A tensioning module is arranged between the conveying roller and the cutting mechanism, and the two sides of the inner mold are tensioned by the tensioning module. The tensioning module is divided into two groups and the two groups of tensioning modules are located on both sides of the inner bag. Each group of tensioning modules includes a swing arm and a pressing wheel. Each group of tensioning modules is two swing arms. The swing arms are installed on both sides of the frame by rotating cooperation. A linkage assembly is arranged between the swing arm and the conveying roller. A pressing wheel is installed at the other end of each swing arm. A sliding rod is installed on the central axis of the pressing wheel. The sliding rod passes through the swing arm and slides along the swing arm. A first electric push rod is arranged between the sliding rod and the swing arm. The first electric push rod is telescopic to drive the translation of the sliding rod. A travel switch and a trigger sheet are respectively arranged on the inner sides of the two swing arms. When the two pressing wheels are in contact, the travel switch is triggered, and the first electric push rod is lifted, so that the sliding rod moves outward.

6. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 5, characterized in that: Two vertical slide grooves are opened on the frame, and two sliding seats arranged opposite to each other are inserted in each slide groove. Both ends of the conveying roller are installed on the sliding seats through bearings. The linkage component is a linkage rod. A sliding sleeve is sleeved on the linkage rod. The sliding sleeve is fixed on the frame. A pull rod is hinged between the linkage rod and the sliding seat and the swing arm. A second electric push rod is arranged between the linkage rod and the frame. The second electric push rod is used to realize the approach of the sliding seat and the closing of the swing arm. The second electric push rod and the trigger switch are connected and communicated with the controller.

7. The automatic nesting mechanism for inner and outer bags of a market bag according to claim 6, characterized in that: The outer bag conveying mechanism is a flat plate, on which a groove for installing a belt is opened, and the top of the belt is flush with the top of the flat plate; negative pressure holes are opened at equal intervals on the outer wall of the belt, and a negative pressure cavity is arranged on the inner side of the belt, and the top of the negative pressure cavity is opened and fits the inner side of the belt. When the negative pressure hole moves to the position of the negative pressure cavity, the negative pressure hole is connected with the negative pressure cavity and absorbs the outer bag, so that the outer bag moves synchronously with the belt; a groove is opened on the flat plate, and a stopper is hinged in the groove. When the stopper is swung down, the top surface of the stopper is lower than the top surface of the flat plate, and one end of the stopper rotates with one end of the groove The other end of the block is hinged to the bottom of the groove through a cylinder, and the block is swung upward by the cylinder. A trigger assembly is installed on the top surface of the block. When the edge of the outer bag is against the block, the trigger assembly is triggered, the cylinder retracts, and the block retracts into the groove. A photoelectric sensor is installed above and on the flat plate. The photoelectric sensor is located in front of the block. The photoelectric sensor is docked with the cylinder. When the photoelectric sensor is in an interrupted state, the cylinder rises, and the block blocks the bag body. The block is located on the front side of the negative pressure chamber.

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