Automated express bag production line based on coordinated control of heat sealing, hot cutting and intermittent conveying

Abstract

The present invention relates to the field of express bag production, and specifically to an automated express bag production line based on the coordinated control of heat sealing, heat cutting, and intermittent conveying, comprising a machine body, a sealing and cutting unit and a conveying unit provided on the machine body, the sealing and cutting unit comprising a heat sealing knife and a knife column; a separation unit provided between the sealing and cutting unit and the conveying unit, the separation unit comprising a lifting plate, a follower plate, a bracket, and a first spring; the lifting plate is arranged on the machine body for vertical movement; the follower plate is arranged above the lifting plate for vertical movement, and when the follower plate is in the lowest position, a gap exists between the lifting plate and the follower plate for the express bag to pass through; the bracket is fixedly provided horizontally on the machine body; and the first spring is provided vertically between the bracket and the follower plate. The present invention avoids the occurrence of false connections in express bags, reduces the frequency of regular maintenance of the heat sealing knife, and ensures the production efficiency of the automated express bag production line.

Description

Technical Field

[0001] The present invention application relates to the field of express bag production, specifically to an automated express bag production line based on coordinated control of heat sealing, hot cutting and intermittent conveying. Background Art

[0002] Handle courier bags, evolved from conventional courier bags, have become increasingly common in the express delivery industry. They typically feature sealed edges on the left and right sides, a glue-sealed opening on the bottom, and a top seal with a handle hole and a top-sealed handle. During production, the left and right side seals are the last process, following the heat-sealing process below the handle hole using a heat sealer, punching the handle hole using a heated punching die, and gluing and attaching a release film to the bottom.

[0003] However, during the heat sealing and hot cutting process, due to the wear of the heat sealing knife, the express bag may not be completely cut, resulting in the express bag being connected after heat cutting. At the same time, after the express bag is heat cut, if a traditional belt conveyor is used for transportation, the cut express bag may slip or shift in position. If two conveyors are superimposed and used, the two belt conveyors will clamp and transport the cut express bag, but it will be difficult for the express bag to smoothly enter between the two belt conveyors. Summary of the Invention

[0004] In response to the above problems, an automated production line for express bags based on coordinated control of heat sealing, heat cutting and intermittent conveying is provided. By arranging a separation unit between the sealing and cutting unit and the conveying unit, the lifting plate and the follower plate are arranged in the vertical direction, and there is a gap between the lifting plate and the follower plate. When the sealing and cutting unit seals and cuts the express bag, the express bag is located in the gap between the lifting plate and the follower plate. When the heat sealing knife and the knife column are aligned, that is, when the heat sealing knife and the knife column cut the express bag, the heat sealing knife will not be lifted immediately. During this process, the lifting plate rises and drives the follower plate to rise synchronously. When the first spring on the upper part of the follower plate is squeezed, the first spring provides pressure on the follower plate, so that the lifting plate and the follower plate can stably clamp the express bag. When the express bag between the lifting plate and the follower plate no longer slips, the lifting plate and the sliding plate continue to rise and can pull the express bag apart.

[0005] To solve the problems of the prior art, the present invention provides an automated express bag production line based on the coordinated control of heat sealing and cutting and intermittent conveying, comprising a machine body, on which a sealing and cutting unit and a conveying unit are arranged, wherein the sealing and cutting unit comprises a heat sealing knife and a knife column;

[0006] A separation unit is provided between the sealing and cutting unit and the conveying unit, and includes a lifting plate, a follower plate, a bracket, and a first spring; the lifting plate is arranged on the machine body for vertical movement; the follower plate is arranged above the lifting plate for vertical movement; when the follower plate is at the lowest position, a gap is provided between the lifting plate and the follower plate for the express bag to pass through; the bracket is fixedly provided horizontally on the machine body; the first spring is vertically provided between the bracket and the follower plate, and the two ends of the first spring are fixedly connected to the follower plate and the bracket respectively;

[0007] The conveying unit includes a belt conveyor, a conveyor belt, a driving wheel and a second rotary driver. The belt conveyor is horizontally arranged on the machine body and is used to receive express bags. The conveyor belt is rotatably arranged above the belt conveyor. The side of the conveyor belt facing the sealing and cutting unit forms an acute angle with the upper end face of the belt conveyor. There are multiple driving wheels and they are all arranged inside the conveyor belt. The driving wheel cooperates with the conveyor belt transmission. The second rotary driver is arranged on one of the driving wheels.

[0008] Preferably, the separation unit further comprises an extension rod and a limiting ring;

[0009] The extension rod is vertically fixed on the upper part of the follower plate and passes through the bracket, and the extension rod and the bracket are slidably matched in the vertical direction;

[0010] The limiting ring is fixedly arranged on the top of the extension rod. When the limiting ring contacts the upper part of the bracket, the first spring is in an unstressed state.

[0011] Preferably, a rack is vertically fixedly provided on one side of the lifting plate, and a first gear is rotatably engaged with one side of the rack.

[0012] Preferably, a rotating disk and a lifting unit are provided on one side of the first gear;

[0013] The rotating disk is rotatably arranged on one side of the first gear, and a section of meshing teeth is fixedly arranged on the outer periphery of the rotating disk, and the length of the meshing teeth section accounts for one quarter of the total length of the outer periphery of the rotating disk;

[0014] The lifting unit is arranged on the upper part of the rotating disk. When the rotating disk rotates, the lifting unit drives the heat sealing knife to move up and down.

[0015] Preferably, the lifting unit includes a first limiting plate, a lifting rod, a hinged column and a connecting rod;

[0016] The first limiting plate is fixedly arranged horizontally on the side wall of the heat sealing knife;

[0017] The lifting rod is vertically movable and is arranged below the first limit plate. Before the heat sealing knife contacts the courier bag, the upper end of the lifting rod is always in contact with the first limit plate.

[0018] The hinged column is fixedly arranged at the end of the rotating disk;

[0019] The two ends of the connecting rod are respectively hinged to the hinge column and the lower end of the lifting rod.

[0020] Preferably, the separation unit further includes a second limiting plate and a second spring;

[0021] The second limiting plate is fixedly arranged horizontally on the side wall of the heat sealing knife, the second limiting plate is located below the first limiting plate, and the upper end of the lifting rod is always located above the second limiting plate;

[0022] The second spring is vertically arranged between the second limiting plate and the upper end of the lifting rod, and both ends of the second spring are fixedly connected to the second limiting plate and the upper end of the lifting rod respectively.

[0023] Preferably, a driving unit is provided at one end of the rotating disk, and the driving unit comprises a first rotary driver and a second gear;

[0024] Two second gears are provided, the two second gears are arranged vertically and mesh with each other, and one of the second gears is coaxially connected to the central shaft with the rotating disk;

[0025] The first rotation driver is provided at an end of the second gear which is not connected to the rotating disk, and is used for driving the second gear to rotate.

[0026] Preferably, the conveying unit comprises a belt conveyor, a conveyor belt, a driving wheel and a second rotary drive;

[0027] The belt conveyor is horizontally arranged on the machine body and is used to receive the express bags;

[0028] The conveyor belt is rotatably arranged above the belt conveyor, and the side of the conveyor belt facing the sealing and cutting unit forms an acute angle with the upper end surface of the belt conveyor;

[0029] There are multiple driving wheels and they are all arranged inside the conveyor belt, and the driving wheels are in transmission cooperation with the conveyor belt;

[0030] The second rotary drive is provided on one of the drive wheels.

[0031] Preferably, the conveying unit further comprises a swing wheel, a swing arm and a third rotary drive;

[0032] The swing wheel is arranged on the inner ring of the conveyor belt and cooperates with the conveyor belt transmission. The swing wheel is located at the end of the conveyor belt facing the sealing and cutting unit;

[0033] One end of the swing arm is hinged to the swing wheel. The hinge between the swing arm and the swing wheel is called the swing end. The other end of the swing arm is called the center end. The swing end swings around the center end.

[0034] The third rotary driver is disposed at the center end of the swing arm and is used to drive the swing arm to swing.

[0035] Preferably, a tensioning wheel for tensioning the conveyor belt is also provided inside the conveyor belt.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The present invention applies to setting a separation unit between the sealing and cutting unit and the conveying unit so that the lifting plate and the follower plate are arranged in the vertical direction, and there is a gap between the lifting plate and the follower plate. When the sealing and cutting unit seals and cuts the express bag, the express bag is located in the gap between the lifting plate and the follower plate. When the heat-sealing knife and the knife column are aligned, that is, when the heat-sealing knife and the knife column cut the express bag, the heat-sealing knife will not be lifted immediately. During this process, the lifting plate rises and drives the follower plate to rise synchronously. When the first spring on the upper part of the follower plate is squeezed, the first spring provides pressure to the follower plate, so that the lifting plate and the follower plate can stably clamp the express bag. When the express bag between the lifting plate and the follower plate no longer slips, the lifting plate and the sliding plate continue to rise and can pull the express bag apart, avoiding the situation where the express bag is loosely connected, reducing the frequency of regular maintenance of the heat-sealing knife, and ensuring the production efficiency of the express bag automated production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a three-dimensional diagram of the automatic production line for express bags applied by the present invention Figure 1 .

[0039] Figure 2 This is a three-dimensional diagram of the automatic production line for express bags applied by the present invention Figure 2 .

[0040] Figure 3 This invention application Figure 2 A local enlarged schematic diagram of point A in the middle.

[0041] Figure 4 It is a side view of the automatic production line for express bags applied for by the present invention.

[0042] Figure 5 This invention application Figure 4 Schematic cross-sectional view at the middle BB.

[0043] Figure 6 It is a cutaway perspective schematic diagram of the automated production line for express bags applied for by the present invention.

[0044] Figure 7 This invention application Figure 6 A partial enlarged schematic diagram of point C in the middle.

[0045] Figure 8 It is a three-dimensional schematic diagram of the automated production line for express bags applied for by the present invention with the body removed.

[0046] Figure 9 This invention application Figure 8 A local enlarged schematic diagram of point D in the middle.

[0047] The numbers in the figure are:

[0048] 1. Machine body; 2. Sealing and cutting unit; 21. Heat sealing knife; 22. Knife column; 3. Conveying unit; 31. Belt conveyor; 32. Conveyor belt; 33. Driving wheel; 34. Second rotary driver; 35. Swing wheel; 36. Swing arm; 37. Third rotary driver; 38. Tensioning wheel; 4. Separating unit; 41. Lifting plate; 42. Follower plate; 421. Rack; 422. First gear; 423. Rotating disk; 4231. Meshing gear; 424. Lifting unit; 4241. First limit plate; 4242. Lifting rod; 4243. Articulated column; 4244. Connecting rod; 43. Bracket; 44. First spring; 45. Extension rod; 46. Limiting ring; 47. Second limit plate; 48. Second spring; 49. Driving unit; 491. Second gear; 492. First rotary driver; 5. Express bag. DETAILED DESCRIPTION

[0049] In order to further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0050] Reference Figures 1-8 : An automated production line for express bags based on coordinated control of heat sealing, hot cutting and intermittent conveying, comprises a machine body 1, on which a sealing and cutting unit 2 and a conveying unit 3 are arranged, the sealing and cutting unit 2 comprises a heat sealing knife 21 and a knife column 22; a separation unit 4 is arranged between the sealing and cutting unit 2 and the conveying unit 3, the separation unit 4 comprises a lifting plate 41, a follower plate 42, a bracket 43 and a first spring 44; the lifting plate 41 is arranged on the machine body 1 for movement in the vertical direction; the follower plate 42 is arranged above the lifting plate 41 for movement in the vertical direction, and when the follower plate 42 is in the lowest position, there is a gap between the lifting plate 41 and the follower plate 42 for the express bag 5 to pass through; the bracket 43 is fixedly arranged horizontally on the machine body 1; the first spring 44 is vertically arranged between the bracket 43 and the follower plate 42, and the two ends of the first spring 44 are fixedly connected to the follower plate 42 and the bracket 43 respectively.

[0051] During the production process of express bags 5, the raw materials of express bags 5 are usually released in rolls. The sealing and punching of the hand-held side are completed before the sealing and cutting unit 2, and then the bags intermittently enter the sealing and cutting unit 2 for heat sealing and hot cutting, thus completing the edge sealing and cutting of the express bags. In the prior art, the sealing and cutting unit 2 is mainly used to cut and segment the express bags. The sealing and cutting unit 2 includes a heat sealing knife 21 and a knife column 22. When cutting, the express bag 5 is passed between the heat sealing knife 21 and the knife column 22, and then the heat sealing knife 21 is heated up and cooled down and matches the knife column 22, thereby achieving the sealing and cutting of the express bag 5. However, after a period of use, it is easy for the express bag 5 to fail to be completely cut. The main reasons include that the temperature of the heat sealing knife 21 is not enough, the sealing and cutting time is insufficient, the heat sealing knife 21 and the knife column 22 cannot match normally, the blade of the heat sealing knife 21 is blunt, the pressure of the heat sealing knife 21 is too low, etc. The heat-sealing knife 21 will inevitably become blunted as it is used, or the courier bag 5 cannot be cut smoothly due to plastic residue on the heat-sealing knife 21. Therefore, the heat-sealing knife 21 needs to be regularly maintained. During the maintenance process, the entire production line needs to be shut down. Even after the maintenance, there is no guarantee that the heat-sealing knife 21 can completely cut the courier bag 5. It is worth noting that the courier bag 5 mentioned above cannot be cut refers to the courier bag 5 being in a virtual connection state after being cut by the heat-sealing knife 21, not a completely connected state. This is because when the heat-sealing knife 21 cuts the courier bag 5, it not only relies on the sharpness of the blade of the heat-sealing knife 21, but also relies on high-temperature heating to assist. Therefore, the courier bag 5 that has not been cut is mostly in a virtual connection state.

[0052] In order to avoid the above situation, the existing automated production line for express bags 5 is optimized and designed. By setting a separation unit 4 between the sealing and cutting unit 2 and the conveying unit 3, when the sealing and cutting unit 2 cuts the express bag 5, the separation unit 4 simultaneously pulls the express bag 5, so that the express bag 5 can be completely disconnected, avoiding the situation where the express bag 5 is not connected after sealing and cutting, reducing the frequency of regular maintenance of the heat sealing knife 21, and ensuring the production efficiency of the automated production line for express bags 5. The specific structure and working process of the present invention application are as follows:

[0053] During use, first, the express bag 5 is transported to the sealing and cutting unit 2. The end of the express bag 5 stops moving after passing through the sealing and cutting unit 2 for a specified length. The sealing and cutting unit 2 starts to seal and cut the express bag 5. The end of the express bag 5 passes through the sealing and cutting unit 2, which means that the express bag 5 passes between the heat sealing knife 21 and the knife column 22. At this time, the lifting plate 41 is located below the express bag 5, and the follower plate 42 is located above the express bag 5. Then the heat sealing knife 21 descends and coincides with the knife column 22. The heat sealing knife 21 is in a heated state, which increases the cutting speed of the heat sealing knife 21. After the heat sealing knife 21 coincides with the knife column 22, it stays for 0.6 to 0.8 seconds. During this process, As the lifting plate 41 rises, the gap between the lifting plate 41 and the follower plate 42 gradually narrows. As the lifting plate 41 rises, it lifts the courier bag 5. After the lifting plate 41 and the follower plate 42 clamp the courier bag 5, the lifting plate 41 continues to rise, compressing the first spring 44. The compressed first spring 44 provides pressure to the follower plate 42, allowing the lifting plate 41 and the follower plate 42 to fully clamp the courier bag 5. As the lifting plate 41 and the follower plate 42 continue to rise, the courier bag 5 is pulled by the lifting plate 41 and the follower plate 42. Under the high temperature of the heat-sealing knife 21, the courier bag 5 is completely severed, preventing the courier bag 5 from being loosely connected. The conveying unit 3 is disposed at the rear end of the sealing and cutting unit 2. While the sealing and cutting unit 2 is cutting the courier bag 5, the conveying unit 3 is stationary. After the cutting is completed, the conveying unit 3 starts again and discharges the cut courier bag 5.

[0054] By setting the separation unit 4 between the sealing and cutting unit 2 and the conveying unit 3, the lifting plate 41 and the follower plate 42 are arranged in the vertical direction, and there is a gap between the lifting plate 41 and the follower plate 42. When the sealing and cutting unit 2 seals and cuts the express bag 5, the express bag 5 is located in the gap between the lifting plate 41 and the follower plate 42. When the heat sealing knife 21 and the knife column 22 coincide with each other, that is, when the heat sealing knife 21 and the knife column 22 cut the express bag 5, the heat sealing knife 21 will not be lifted immediately. During this process, the lifting plate 41 rises and drives the follower plate 42 They rise synchronously. When the first spring 44 on the upper part of the follower plate 42 is squeezed, the first spring 44 provides pressure to the follower plate 42, so that the lifting plate 41 and the follower plate 42 can stably clamp the express bag 5. When the express bag 5 between the lifting plate 41 and the follower plate 42 no longer slips, the lifting plate 41 and the sliding plate continue to rise and can pull the express bag 5 apart, avoiding the situation of false connection of the express bag 5, reducing the frequency of regular maintenance of the heat sealing knife 21, and ensuring the production efficiency of the automated production line of the express bag 5.

[0055] Reference Figure 8 : The separation unit 4 further includes an extension rod 45 and a limiting ring 46;

[0056] The extension rod 45 is vertically fixed on the upper part of the follower plate 42 and passes through the bracket 43. The extension rod 45 and the bracket 43 slide together in the vertical direction. The limiting ring 46 is fixed on the top of the extension rod 45. When the limiting ring 46 contacts the upper part of the bracket 43, the first spring 44 is in an unstressed state.

[0057] Since the first spring 44 needs to provide an extruding force to the follower plate 42, in order to extend the service life of the first spring 44, an extension rod 45 is provided on the upper part of the follower plate 42, and a limit ring 46 is provided on the top of the extension rod 45. When the lifting plate 41 is not raised, the follower plate 42 is in the lowest position. At this time, the gap between the lifting plate 41 and the follower plate 42 is the largest, and the first spring 44 is in an unstressed state, that is, the first spring 44 is neither in a stretched state nor in a compressed state. This ensures that when the follower plate 42 is not lifted by the lifting plate 41, the first spring 44 will not be affected by the gravity of the follower plate 42, thereby extending the service life of the first spring 44 and reducing the cost of use.

[0058] Reference Figure 8 : A rack 421 is vertically fixed on one side of the lifting plate 41, and a first gear 422 is rotatably engaged with one side of the rack 421. The first gear 422 is rotatably set on the body 1 through an axis and a bearing. When the first gear 422 rotates, the rack 421 is driven up by the first gear 422.

[0059] Reference Figure 1 and Figure 8 : A rotating disk 423 and a lifting unit 424 are provided on one side of the first gear 422; the rotating disk 423 is rotatably provided on the body 1 on one side of the first gear 422 through a shaft and a bearing, and a section of meshing teeth 4231 is fixedly provided on the outer periphery of the rotating disk 423, and the length of the meshing teeth 4231 section accounts for one quarter of the total length of the outer periphery of the rotating disk 423; the lifting unit 424 is provided on the upper part of the rotating disk 423, and when the rotating disk 423 rotates, the lifting unit 424 drives the heat sealing knife 21 to rise and fall.

[0060] Reference Figure 8 and Figure 9 : The lifting unit 424 includes a first limit plate 4241, a lifting rod 4242, a hinged column 4243 and a connecting rod 4244; the first limit plate 4241 is horizontally fixed on the side wall of the heat sealing knife 21; the lifting rod 4242 is vertically movable below the first limit plate 4241, and a guide sleeve for guiding the moving direction of the lifting rod 4242 is provided at the position corresponding to the lifting rod 4242 on the body 1. Before the heat sealing knife 21 contacts the express bag 5, the upper end of the lifting rod 4242 is always in contact with the first limit plate 4241; the hinged column 4243 is fixed at the end of the rotating disk 423; the two ends of the connecting rod 4244 are respectively hinged to the hinged column 4243 and the lower end of the lifting rod 4242.

[0061] Reference Figure 9 : The separation unit 4 also includes a second limit plate 47 and a second spring 48; the second limit plate 47 is horizontally fixed on the side wall of the heat sealing knife 21, the second limit plate 47 is located below the first limit plate 4241, and the upper end of the lifting rod 4242 is always located above the second limit plate 47; the second spring 48 is vertically arranged between the second limit plate 47 and the upper end of the lifting rod 4242, and the two ends of the second spring 48 are respectively fixedly connected to the second limit plate 47 and the upper end of the lifting rod 4242.

[0062] In addition, both sides of the follower plate 42 are outside the zipper bag, and blind holes are respectively opened at the bottom of both sides of the follower plate 42. A third spring is fixedly connected between the top wall of the blind hole and the top surface of the lifting plate 41. The size of the third spring after maximum compression is no greater than the depth of the blind hole.

[0063] A driving unit 49 is provided at the end of the rotating disk 423. The driving unit 49 is used to drive the rotating disk 423 to rotate. The hinged column 4243 provided on the rotating disk 423 has the highest position and the lowest position as the rotating disk 423 rotates. Before cutting, the hinged column 4243 provided on the rotating disk 423 is in the highest position. Then the driving unit 49 drives the rotating disk 423 to rotate, and the hinged column 4243 on the rotating disk 423 rotates and descends. The hinged column 4243 drives the lifting rod 4242 to descend through the connecting rod 4244. At this time, the meshing teeth 4231 on the rotating disk 423 are not engaged with the first gear 422, so the first gear 422 does not rotate. When the heat sealing knife 21 is aligned with the knife column 22, that is, when the heat sealing knife 21 starts to seal and cut the express bag 5, At this time, the heat sealing knife 21 contacts the express bag 5, and the heat sealing knife 21 no longer descends, the meshing teeth 4231 on the rotating disk 423 begin to mesh with the first gear 422, and the driving unit 49 continues to drive the rotating disk 423 to rotate in its inherent direction. The heat sealing knife 21 no longer descends, and the lifting rod 4242 continues to descend under the action of the connecting rod 4244, and the third spring and the second spring 48 are compressed. The compressed second spring 48 generates pressure on the heat sealing knife 21, so that the pressure when the heat sealing knife 21 and the knife column 22 coincide with each other continues to increase, and the lifting rod 4242 is lifted. The probability of the express bag 5 being broken is increased, and at this time the first gear 422 is engaged with the meshing tooth 4231 on the rotating disk 423, and the first gear 422 drives the rack 421 to rise, thereby causing the lifting plate 41 to rise and clamp the express bag 5 together with the follower plate 42. When the hinge column 4243 on the rotating disk 423 rotates to the lowest position, the second spring 48 reaches the maximum compression amount, and the first spring 44 and the third spring are also at the maximum compression amount. At this time, the lifting plate 41 and the follower plate 42 complete the pulling of the express bag 5, thereby achieving To completely disconnect the courier bag 5, the drive unit 49 then continues to rotate the rotating disk 423, disengaging the meshing teeth 4231 on the rotating disk 423 from the first gear 422. The hinge post 4243 moves from its lowest position to its highest position, and the first spring 44 drives the follower plate 42 to reset. Simultaneously, the lifting plate 41 descends and resets. The rack 421 descends under its own weight, the elastic force of the third spring, and the weight of the lifting plate 41, driving the first gear 422 to rotate. When the lifting plate 41 is completely lowered, it stops moving. The conveying unit 3 conveys and discharges the sealed courier bag 5. As the hinge post 4243 moves from its lowest position to its highest position, the second spring 48 gradually recovers. Subsequently, the lifting rod 4242 contacts and lifts the first limit plate 4241, causing the heat sealing knife 21 to rise synchronously with the lifting rod 4242, disengaging the heat sealing knife 21 from the knife post 22.

[0064] Reference Figure 1 and Figure 4A drive unit 49 is provided at one end of the rotating disk 423. The drive unit 49 includes a first rotation driver 492 and a second gear 491. Two second gears 491 are provided, arranged vertically and meshing with each other. One of the second gears 491 is coaxially connected to the central axis of the rotating disk 423. The first rotation driver 492 is provided at the end of the second gear 491 not connected to the rotating disk 423 and is used to drive the second gear 491 to rotate. The first rotation driver 492 is preferably a servo motor.

[0065] Reference Figure 2 : The conveying unit 3 includes a belt conveyor 31, a conveyor belt 32, a driving wheel 33 and a second rotary driver 34; the belt conveyor 31 is horizontally arranged on the body 1 and is used to receive the express bag 5; the conveyor belt 32 is rotatably arranged above the belt conveyor 31, and the side of the conveyor belt 32 facing the sealing and cutting unit 2 forms an acute angle with the upper end face of the belt conveyor 31; there are multiple driving wheels 33 and they are all arranged inside the conveyor belt 32, and the driving wheel 33 is coordinated with the conveyor belt 32 for transmission; the second rotary driver 34 is arranged on one of the driving wheels 33.

[0066] The second rotary driver 34 is preferably a servo motor. The second rotary driver 34 drives the conveyor belt 32 to rotate via the drive wheel 33. The second rotary driver 34 starts and stops synchronously with the belt conveyor 31. By forming an acute angle between the side of the conveyor belt 32 facing the sealing and cutting unit 2 and the upper end face of the belt conveyor 31, it is ensured that the express bag 5 can smoothly enter between the conveyor belt 32 and the belt conveyor 31. The cut express bag 5 is clamped and transported by the belt conveyor 31 and the conveyor belt 32, ensuring that the express bag 5 is not easily displaced during rapid transportation. If only a single belt conveyor 31 is provided to transport the express bag 5, the express bag 5 is likely to deviate during transportation.

[0067] Reference Figure 1 、 Figure 2 and Figure 5 : The conveying unit 3 also includes a swing wheel 35, a swing arm 36 and a third rotary driver 37; the swing wheel 35 is arranged on the inner ring of the conveyor belt 32 and cooperates with the conveyor belt 32 in transmission, and the swing wheel 35 is located at the end of the conveyor belt 32 facing the sealing and cutting unit 2; one end of the swing arm 36 is hinged to the swing wheel 35, and the hinge point between the swing arm 36 and the swing wheel 35 is called the swing end, and the other end of the swing arm 36 is called the center end, and the swing end swings around the center end; the third rotary driver 37 is arranged at the center end of the swing arm 36 and is used to drive the swing arm 36 to swing.

[0068] When the sealing and cutting unit 2 seals and cuts the courier bag 5, the swing arm 36 drives the swing wheel 35 to rise. At this time, the angle between the conveyor belt 32 and the belt conveyor 31 is at its maximum. When the courier bag 5 is completely cut, that is, when the heat sealing knife 21 rises, the courier bag 5 is located between the conveyor belt 32 and the belt conveyor 31. The swing arm 36 drives the swing wheel 35 to descend, so that the angle between the conveyor belt 32 and the belt conveyor 31 is zero. Then, the second rotary drive 34 and the belt conveyor 31 operate synchronously. This ensures the stability of the conveyor unit 3 when it quickly transports the sealed and cut courier bag 5.

[0069] Reference Figure 6 : In conveyor belt 32, also be provided with the tensioning wheel 38 that conveyor belt 32 is tensioned. Tensioning wheel 38 provides tensioning force to conveyor belt 32 when oscillating wheel 35 swings, guarantees that conveyor belt 32 can not and the situation of loosening between driving wheel 33 and oscillating wheel 35 when rotating.

[0070] Working principle: During use, first, the express bag 5 is transported to the sealing and cutting unit 2, and the end of the express bag 5 stops moving after passing through the sealing and cutting unit 2 for a specified length, and the sealing and cutting unit 2 starts to seal and cut the express bag 5. The end of the express bag 5 passes through the sealing and cutting unit 2, which means that the express bag 5 passes between the heat sealing knife 21 and the knife column 22, and at this time the lifting plate 41 is located below the express bag 5, and the lifting plate 41 is located above the express bag 5. Then the heat sealing knife 21 descends and coincides with the knife column 22. The heat sealing knife 21 is in a heated state, which increases the cutting speed of the heat sealing knife 21. After the heat sealing knife 21 coincides with the knife column 22, it stays for 0.6 to 0.8 seconds. During the process, the lifting plate 41 rises, and the gap between the lifting plate 41 and the follower plate 42 gradually narrows. As the lifting plate 41 rises, it lifts the courier bag 5. After the lifting plate 41 and the follower plate 42 clamp the courier bag 5, the lifting plate 41 continues to rise, causing the first spring 44 to be compressed. The compressed first spring 44 provides pressure for the follower plate 42, allowing the lifting plate 41 and the follower plate 42 to completely clamp the courier bag 5. As the lifting plate 41 and the follower plate 42 continue to rise, the courier bag 5 is pulled by the lifting plate 41 and the follower plate 42. Under the high temperature of the heat sealing knife 21, the courier bag 5 is completely cut, avoiding the situation where the courier bag 5 has a loose connection. The conveying unit 3 is arranged at the rear end of the sealing and cutting unit 2. When the sealing and cutting unit 2 cuts the courier bag 5, the conveying unit 3 is in a stationary state. After the cutting is completed, the conveying unit 3 starts again and discharges the cut courier bag 5.

[0071] The above embodiments merely represent one or more embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automated express bag production line based on coordinated control of heat sealing, heat cutting and intermittent conveying, comprising a machine body (1), a sealing and cutting unit (2) and a conveying unit (3) being arranged on the machine body (1), the sealing and cutting unit (2) comprising a heat sealing knife (21) and a knife column (22); It is characterized in that A separation unit (4) is provided between the sealing and cutting unit (2) and the conveying unit (3), and the separation unit (4) includes a lifting plate (41), a follower plate (42), a bracket (43) and a first spring (44); The lifting plate (41) is arranged on the machine body (1) for movement in the vertical direction, and the following plate (42) is arranged above the lifting plate (41) for movement in the vertical direction. When the following plate (42) is at the lowest position, a gap is provided between the lifting plate (41) and the following plate (42) for the express bag (5) to pass through. The bracket (43) is fixedly arranged on the machine body (1) horizontally, and the first spring (44) is vertically arranged between the bracket (43) and the following plate (42). The two ends of the first spring (44) are fixedly connected to the following plate (42) and the bracket (43) respectively. The conveying unit (3) includes a belt conveyor (31), a conveyor belt (32), a driving wheel (33) and a second rotary driver (34). The belt conveyor (31) is horizontally arranged on the machine body (1) and is used to receive the express bag (5). The conveyor belt (32) is rotatably arranged above the belt conveyor (31). The side of the conveyor belt (32) facing the sealing and cutting unit (2) forms an acute angle with the upper end surface of the belt conveyor (31). A plurality of driving wheels (33) are provided and are all arranged inside the conveyor belt (32). The driving wheel (33) and the conveyor belt (32) are in transmission cooperation. The second rotary driver (34) is arranged on one of the driving wheels (33). A rack (421) is vertically fixed on one side of the lifting plate (41), a first gear (422) is rotatably engaged with one side of the rack (421), and a rotating disk (423) and a lifting unit (424) are provided on one side of the first gear (422); The rotating disk (423) is rotatably arranged on one side of the first gear (422), and a section of meshing teeth (4231) is fixedly arranged on the outer periphery of the rotating disk (423), and the length of the meshing teeth (4231) section accounts for one quarter of the total length of the outer periphery of the rotating disk (423); the lifting unit (424) is arranged on the upper part of the rotating disk (423), and when the rotating disk (423) rotates, the lifting unit (424) drives the heat sealing knife (21) to rise and fall; The lifting unit (424) comprises a first limiting plate (4241), a lifting rod (4242), a hinged column (4243) and a connecting rod (4244). The first limiting plate (4241) is fixedly arranged horizontally on the side wall of the heat sealing knife (21); the lifting rod (4242) is arranged to move vertically below the first limiting plate (4241); before the heat sealing knife (21) contacts the express bag (5), the upper end of the lifting rod (4242) is always in contact with the first limiting plate (4241); the hinged column (4243) is fixedly arranged at the end of the rotating disk (423); and the two ends of the connecting rod (4244) are hinged to the hinged column (4243) and the lower end of the lifting rod (4242), respectively.

2. The express bag automated production line based on the coordinated control of heat sealing, hot cutting and intermittent conveying according to claim 1 is characterized in that: The separation unit (4) further includes an extension rod (45) and a limiting ring (46); The extension rod (45) is vertically fixedly arranged on the upper part of the follower plate (42) and passes through the bracket (43), and the extension rod (45) and the bracket (43) are slidably matched in the vertical direction; The limiting ring (46) is fixedly arranged on the top of the extension rod (45). When the limiting ring (46) contacts the upper part of the bracket (43), the first spring (44) is in an unstressed state.

3. The express bag automated production line based on coordinated control of heat sealing, hot cutting and intermittent conveying according to claim 1 is characterized in that: The separation unit (4) further includes a second limiting plate (47) and a second spring (48); The second limiting plate (47) is fixedly arranged horizontally on the side wall of the heat sealing knife (21), the second limiting plate (47) is located below the first limiting plate (4241), and the upper end of the lifting rod (4242) is always located above the second limiting plate (47); The second spring (48) is vertically arranged between the second limiting plate (47) and the upper end of the lifting rod (4242), and the two ends of the second spring (48) are fixedly connected to the second limiting plate (47) and the upper end of the lifting rod (4242) respectively.

4. The express bag automated production line based on coordinated control of heat sealing, hot cutting and intermittent conveying according to claim 1 is characterized in that: A driving unit (49) is provided at one end of the rotating disk (423), and the driving unit (49) includes a first rotation driver (492) and a second gear (491); Two second gears (491) are provided, and the two second gears (491) are arranged vertically and mesh with each other, and one of the second gears (491) is coaxially connected to the central axis with the rotating disk (423); The first rotation driver (492) is provided at the end of the second gear (491) that is not connected to the rotating disk (423), and the first rotation driver (492) is used to drive the second gear (491) to rotate.

5. The express bag automated production line based on coordinated control of heat sealing, hot cutting and intermittent conveying according to claim 1 is characterized in that: The conveying unit (3) further comprises a swing wheel (35), a swing arm (36) and a third rotary drive (37); The swing wheel (35) is arranged on the inner ring of the conveyor belt (32) and is in transmission cooperation with the conveyor belt (32). The swing wheel (35) is located at the end of the conveyor belt (32) facing the sealing and cutting unit (2); One end of the swing arm (36) is hinged to the swing wheel (35), the hinged portion of the swing arm (36) and the swing wheel (35) is called the swing end, and the other end of the swing arm (36) is called the center end, and the swing end swings around the center end; The third rotary driver (37) is provided at the center end of the swing arm (36) and is used to drive the swing arm (36) to swing.

6. The express bag automated production line based on the coordinated control of heat sealing, hot cutting and intermittent conveying according to claim 5 is characterized in that: A tensioning wheel (38) for tensioning the conveyor belt (32) is also provided in the conveyor belt (32).

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