Heat shrink packaging machine

Abstract

The present invention belongs to the technical field of packaging equipment, and specifically discloses a heat shrink packaging machine, including a frame, a feeding mechanism, a film rolling mechanism and an end film folding and heat sealing mechanism, wherein the feeding mechanism includes a first conveyor belt, a second conveyor belt adjacent to the side of the first conveyor belt and a third conveyor belt located at the conveying end of the first conveyor belt, the third conveyor belt is used to push the objects to be packaged located on the first conveyor belt to the second conveyor belt one by one, the film rolling mechanism includes a film rolling device and a side film folding and heat sealing mechanism, the film rolling device is used to coat a single object to be packaged, and the end film folding and heat sealing mechanism is used to fold and heat seal the film at both ends of the object to be packaged. By adopting this technical solution, the cooperation between the various mechanisms is utilized to realize the transportation and film coating of the objects to be packaged, the transportation efficiency is improved, and the structure is also simpler.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging arrangement and relates to a heat shrink packaging machine. Background Art

[0002] At present, most of the drug packaging boxes are covered with a layer of film on the outside of the box body for sealing, which protects the box body, serves as a mark of unopened, and also serves as a moisture-proof function.

[0003] In the process of film packaging of drug boxes, the drug boxes need to be arranged and separated first, and then the film is rolled on each drug box. The arrangement and separation process generally uses a robot, claws or manual separation method to separate and transfer a large number of drug boxes. For the separation device using a robot and claws, although the drug boxes can be arranged and separated, it is costly and inefficient, and the drug boxes are prone to collision and wear during separation. It usually needs to be connected to the CNC program, and a lot of debugging work must be done, which is not conducive to mass production. The manual separation method has the disadvantages of cumbersome work, requiring more people, and time-consuming and labor-intensive.

[0004] When rolling the film, a horizontally arranged box mold is usually used. The film is wrapped around the medicine packaging box when it is transported through the box mold by a conveying mechanism, and then it can be folded and sealed. The existing processing devices for folding and heat-sealing the film on the sides and ends of the medicine packaging box need to be connected to an additional power source to control its swing to squeeze the side film to achieve processing. This requires the setting of a more complex mechanism to achieve the above operation, which increases the manufacturing cost and consumes more energy. Summary of the invention

[0005] The object of the present invention is to provide a heat shrink packaging machine, which can realize the conveying of objects to be packaged, improve the conveying efficiency, and complete the film coating packaging of the objects to be packaged.

[0006] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is: a heat shrink packaging machine, comprising a frame, a feeding mechanism, a film rolling mechanism and an end film folding and heat sealing mechanism, the feeding mechanism comprising a first conveyor belt, a second conveyor belt adjacent to the side of the first conveyor belt and a third conveyor belt located at the conveying end of the first conveyor belt, the first conveyor belt and the second conveyor belt are both provided with side limit assemblies, and the third conveyor belt is used to push the objects to be packaged located on the first conveyor belt to the second conveyor belt one by one;

[0007] The film rolling mechanism includes a film rolling device and a side film folding and heat sealing mechanism. The film rolling device is located at the conveying end of the second conveyor belt and is used to coat a single object to be packaged. The side film folding and heat sealing mechanism is correspondingly connected to the discharge end of the film rolling device and is used to complete the folding and heat sealing of the side film of the object to be packaged. The end film folding and heat sealing mechanism is located on one side of the output end of the side film folding and heat sealing mechanism and is used to fold and heat seal the films at both ends of the object to be packaged.

[0008] The working principle and beneficial effects of this basic solution are as follows: manually or automatically placing the objects to be packaged in sequence into the conveying head end of the first conveyor belt, and under the action of the first conveyor belt, the objects to be packaged move to the conveying end of the first conveyor belt. Under the action of the third conveyor belt, the objects to be packaged on the first conveyor belt are pushed one by one onto the second conveyor belt, and then under the action of the second conveyor belt, the objects to be packaged are transported forward one by one. The side limit assembly is used to limit the position of the objects to be packaged in the width direction.

[0009] After the film rolling device has preliminarily rolled the object to be packaged, the object to be packaged is output from the discharge end of the film rolling device, and the object to be packaged enters the side film folding and heat sealing mechanism to achieve film folding and heat sealing of the side film of the object to be packaged, and then the object to be packaged is sent to the end film folding and heat sealing mechanism to complete the film folding and heat sealing of the two ends of the object to be packaged.

[0010] Furthermore, the side folding film heat sealing mechanism comprises a disc, at least one lever, and at least one folding film heat sealing device. The disc is rotatably connected to the frame, and a plurality of equally spaced slots are provided at the edge of the disc. When the lever is away and the disc is in a stationary state, the slots on the disc can be correspondingly connected to the output end of the film rolling device, and a positioning mechanism for positioning the object to be packaged is provided in the slots.

[0011] The disc is provided with a plurality of radial grooves slidably connected to the lever, and the radial grooves are spaced apart from the card slot. The lever is arranged on one side of the disc, and the lever is connected to a power source for controlling its rotation, and the power source is fixedly arranged on the frame. The film folding heat sealing device is connected to the power source through a connecting rod, and a spring is connected to one end of the connecting rod of the film folding heat sealing device, and the other end of the connecting rod is fixedly connected to the output end of the power source and rotates with the power source as the center of the circle. When the film folding heat sealing device rotates, it can abut against the side of the object to be processed in the card slot.

[0012] A certain slot on the disc is connected to the output end of the film rolling device. After the object to be packaged slides out from the output end of the film rolling device, it automatically slides into the slot of the disc. At the same time, the positioning mechanism in the slot positions the object to be packaged to prevent the object to be packaged from slipping accidentally and causing processing errors or damage to the object to be packaged. At the same time, the power source can control the rotation of the lever and the connecting rod, and the lever can be slidably connected to the radial groove on the disc. When one end of the lever rotates into the radial groove of the disc, this end of the lever slides in the radial groove to drive the disc to rotate, so that the object to be packaged placed in the slot of the disc automatically moves to the processing location. The connecting rod drives the film folding and heat sealing device to move to the processing location as the power source rotates. The film folding and heat sealing device then abuts against the side of the object to be packaged in the disc slot at the processing location, and the side film of the object to be packaged is folded and heat sealed using the abutting pressure. A spring is provided between the film folding and heat sealing device and the connecting rod. During the process of the film folding and heat sealing device resisting against the object to be processed, the spring can play a buffering role to prevent the film folding and heat sealing device from excessively squeezing the side film of the object to be packaged and causing damage to the film. Then the film folding and heat sealing device continues to rotate against the connecting rod and leaves the object to be packaged at the location to be processed.

[0013] The folding plate is located at the opposite side of the folding plate, and the folding plate is located at the opposite side of the folding plate.

[0014] The control device can control the push rod to move horizontally back and forth, so the push rod can push the object to be packaged that falls on the placement plate. The push rod will push the object to be packaged to the edge of the placement plate so that the object to be packaged abuts against the baffle, and then the push rod continues to move to the side where the baffle is located. According to the interaction force between the push rod and the baffle on the object to be packaged, it is ensured that the object to be packaged is clamped and will not fall into the discharge hole. The clamping plate is connected to the push plate, and the push plate moves with the push rod. The push plate moves to different positions and drives the clamping plate to rotate at different angles. When the push rod moves to the side of the baffle, the push plate drives the clamping plate to move closer to the push rod, thereby clamping inward, until the push rod moves to the limit, and the film folding plate on the clamping plate just abuts against the two ends of the object to be packaged, so as to achieve the folding of the film at both ends of the object to be packaged. The push plate moves the baffle away from the placement plate, and the slow rebound reset device is affected by the pressure generated by the movement of the baffle, and the slow rebound reset device is in a compressed state.

[0015] When the film folding of the object to be packaged is completed, the control device controls the push rod to reset to the side away from the baffle, and the push plate is also reset with the push rod, the clamping plate becomes open again, and the film folding plate leaves the end of the object to be packaged. Due to the slow rebound characteristics of the slow rebound reset device, the baffle slowly resets. At this time, the object to be packaged is no longer clamped by the push plate and the baffle. The object to be packaged falls into the discharge hole due to its own gravity. The two ends of the object to be packaged are heat-sealed by the hot air blower, completing the packaging process. The slow rebound reset device can also elastically buffer the baffle to prevent the object to be packaged from having a hard collision with the baffle and damaging the object to be packaged.

[0016] Furthermore, a first side limit assembly is arranged on the first conveyor belt, and a second side limit assembly is arranged on the second conveyor belt, and the first side limit assembly has the same structure as the second side limit assembly;

[0017] The first side limit assembly includes a first side plate provided on one side of the first conveyor belt and a second side plate provided on the other side of the first conveyor belt, the first side plate is parallel to the second side plate, and the two sides of the first conveyor belt are respectively provided with a first connecting block and a second connecting block;

[0018] The first connecting block is provided with a first connecting shaft perpendicular to the conveying direction of the first conveyor belt, the first side plate is fixed on the first connecting shaft, and the first side plate is also provided with a first locking bolt for locking the first connecting shaft;

[0019] The second connecting block is provided with a second connecting shaft perpendicular to the conveying direction of the first conveyor belt, the second side plate is fixed on the second connecting shaft, and the second side plate is also provided with a second locking bolt for locking the second connecting shaft.

[0020] Through the above-mentioned structural setting, the width between the first side plate and the second side plate can be adjusted to achieve the limitation of boxes of medicines with different widths. The adjustment method of the first side plate is as follows: loosen the first locking bolt, axially move the first connecting shaft to drive the first side plate to move, and when the first side plate moves to a suitable position, lock the first locking bolt. The adjustment method of the second side plate is the same as the adjustment method of the first side plate. Among them, the upper and lower heights of the first connecting block and the second connecting block are adjustable, and the adjustment method of the first connecting block is used as an example. The adjustment methods of other connecting blocks are the same as the adjustment method of the first connecting block. The first connecting block achieves the adjustment of the upper and lower heights in the following manner: a through groove extending in the up and down directions is provided on the first connecting block, and a locking bolt for height adjustment threadedly connected to the frame is passed through the through groove, and the head of the locking bolt is pressed on the first connecting block.

[0021] Furthermore, a top plate whose upper surface is flush with the upper surface of the first conveyor belt is provided above the second conveyor belt, and a groove extending along the conveying direction of the second conveyor belt is provided in the middle of the top plate. A plurality of first push blocks arranged opposite to the groove and evenly arranged along the conveying direction are provided on the second conveyor belt, and the upper ends of the first push blocks extending into the groove are higher than the upper surface of the top plate.

[0022] The second conveyor belt is annular, and a plurality of first push blocks are evenly arranged on the outer ring surface of the second conveyor belt. The first push blocks that move to the upper part of the second conveyor belt along with the second conveyor belt extend into the slot. The upper end of the first push block located at the upper part of the second conveyor belt is higher than the upper surface of the top plate. The distance between two adjacent first push blocks is greater than the length of the boxed medicine. The boxed medicine that moves to the top plate under the action of the pushing structure is transported forward under the action of the first push blocks. The width of the slot is less than 1 / 3 of the width of the boxed medicine to ensure that the boxed medicine will not enter the slot.

[0023] Furthermore, the positioning mechanism includes airbags arranged on both sides of the inner wall of the slot, an inflation mechanism placed on the side of each slot and a limiting groove parallel to the end face of the slot, the airbag is connected to the corresponding adjacent inflation mechanism, the inflation mechanism is fixedly arranged on the end face of the disc, and a gas rod for pushing the gas is provided on the inflation mechanism, the top of the gas rod is slidably connected to the limiting groove, the limiting groove is a circular ring, and the distance between the side of the limiting groove close to the film rolling device and the end face of the disc is greater than the distance between other parts of the limiting groove and the end face of the disc.

[0024] The inflation mechanism is arranged on the end face of the disc, and the top of the gas rod on the inflation mechanism is restricted to slide in the limiting groove, so the inflation mechanism can slide around the annular limiting groove as the disc rotates. The distance between the limiting groove and the end face of the disc on the side close to the film rolling device is greater than the distance between the other parts of the limiting groove and the end face of the disc. That is, the gas rod of the inflation mechanism close to the film rolling device is in a state of being pulled outward due to the position of the limiting groove, at which time the gas in the airbag is sucked out and the airbag is in a contracted state; while the gas rod of the inflation mechanism at other positions is squeezed by the limiting groove and retracted to push into the inflation mechanism, thereby squeezing the gas into the airbag, filling the airbag and squeezing and positioning the object to be packaged in the corresponding card slot.

[0025] Furthermore, the slow rebound reset device includes a piston cylinder placed on the side of the baffle away from the placement plate, a piston plate sealed and slidably connected in the piston cylinder, and a piston rod arranged between the piston plate and the baffle. The baffle is provided with an air hole, which is connected to the side of the piston cylinder close to the baffle. The air hole is inclined from top to bottom and toward the discharge hole. The side of the piston cylinder away from the baffle and the piston plate are filled with enclosed gas. One end of the piston rod is fixedly connected to the piston plate, and the other end extends out of the piston cylinder and is fixedly connected to the baffle.

[0026] According to the above process, when the baffle moves to the side away from the placement plate, the baffle drives the piston rod to move synchronously, and the piston rod moves the piston plate to the side away from the placement plate. The space in the piston cylinder on the side of the piston plate close to the baffle increases, and this space is in a negative pressure state. The space on this side of the piston cylinder applies suction to the packaged object through the connected air holes to prevent the packaged object from sticking to the push plate and moving to the placement plate with the push plate reset. The enclosed gas in the space on the side of the piston plate away from the baffle in the piston cylinder is squeezed by the piston plate, and has an opposite force on the piston plate.

[0027] Furthermore, the distance between the side of the limiting groove close to the end film folding and heat sealing mechanism and the end surface of the disc is equal to the distance between the side of the limiting groove close to the film rolling device and the end surface of the disc.

[0028] In this way, the push rod on the inflation mechanism close to the end film folding and heat sealing mechanism is in a pulled-out state, and the airbag connected to the corresponding inflation mechanism is in a contracted state, so that the object to be packaged in the corresponding slot slides out of the slot and automatically enters the end film folding and heat sealing mechanism.

[0029] Furthermore, the third conveyor belt is provided with a plurality of second push blocks evenly arranged along the conveying direction, and the conveying direction of the third conveyor belt is perpendicular to the conveying direction of the first conveyor belt.

[0030] The third conveyor belt is annular, and a plurality of second push blocks are evenly arranged on the outer ring surface of the third conveyor belt. The distance from the lower part of the third conveyor belt to the first conveyor belt is greater than the thickness of the objects to be packaged, and the distance from the second push blocks that move to the lower part of the third conveyor belt along with the third conveyor belt to the first conveyor belt is less than the thickness of the objects to be packaged. Driven by the third conveyor belt, the second push blocks can push one object to be packaged from the first conveyor belt to the second conveyor belt at a time, and then the objects to be packaged are transported forward under the action of the first push blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a front view of an embodiment of a heat shrink packaging machine of the present invention;

[0032] Figure 2 is a three-dimensional diagram of a feeding mechanism of an embodiment of a heat shrink packaging machine of the present invention;

[0033] Figure 3 It is a right side view of a disc of an embodiment of a heat shrink packaging machine of the present invention;

[0034] Figure 4 is a top view of a clamping plate of an embodiment of a heat shrink packaging machine of the present invention;

[0035] Figure 5 The present invention provides Figure 2 Enlarged schematic diagram at point A in the middle.

[0036] The figure marks in the drawings of the specification include: a first conveyor belt 1, a second conveyor belt 2, a first side plate 3, a second side plate 4, a third conveyor belt 5, a first push block 6, a second push block 7, a film rolling device 8, a disc 9, a slot 10, a radial slot 11, a lever 12, a first film folding plate 13, a heat sealing head 14, a first power source 15, a second power source 16, a connecting rod 17, a connecting rod 2 18, an air pump 19, a limiting slot 20, an air bag 21, an air rod 22, a rotating wheel 23, a hinged rod 24, a push rod 25, a limiting hole 26, a push plate 27, a placement plate 28, a baffle 29, a piston cylinder 30, a piston plate 31, a piston rod 32, a discharge hole 33, a hot air blower 34, a clamp 35, a second film folding plate 36, a first side limiting assembly 37, a second side limiting assembly 38, a first connecting block 39, a first locking bolt 40, a first connecting shaft 41, and a through slot 42. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0040] As attached Figure 1 and attached Figure 2 As shown: The present invention discloses a heat shrink packaging machine, which includes a frame (not shown in the accompanying drawings), a feeding mechanism, a film rolling mechanism and an end film folding and heat sealing mechanism.

[0041] The feeding mechanism comprises a first conveyor belt 1, a second conveyor belt 2 adjacent to the side of the first conveyor belt 1, and a third conveyor belt 5 located at the conveying end of the first conveyor belt 1. The conveying end of the first conveyor belt 1 is provided with an end limit plate, the first conveyor belt 1 is provided with a first side limit assembly 37, and the second conveyor belt 2 is provided with a second side limit assembly 38. The first side limit assembly 37 and the second side limit assembly 38 are used to limit the position of the box medicine in the width direction. A top plate whose upper surface is flush with the upper surface of the first conveyor belt 1 is provided above the second conveyor belt 2, the side wall of the top plate is welded to the frame, and the middle part of the top plate has a slot extending along the conveying direction of the second conveyor belt 2. The second conveyor belt 2 is provided with a plurality of first push blocks 6 arranged opposite to the slot and evenly arranged along the conveying direction, the upper end of the first push block 6 extending into the slot is higher than the upper surface of the top plate, and the distance between two adjacent first push blocks 6 is greater than the length of the box medicine. The third conveyor belt 5 is provided with a plurality of second push blocks 7 evenly arranged along the conveying direction. The conveying direction of the third conveyor belt 5 is perpendicular to the conveying direction of the first conveyor belt 1. The third conveyor belt 5 is used to push the objects to be packaged on the first conveyor belt 1 to the second conveyor belt 2 one by one.

[0042] The film rolling mechanism includes a film rolling device 8 and a side film folding heat sealing mechanism. The film rolling device 8 is a conventional mechanism composed of a film unwinding device, multiple support rollers, a mold and a film cutting roller. The side film folding heat sealing mechanism includes a disc 9, at least one lever 12, and at least one film folding heat sealing device. The disc 9 is axially rotatably connected to the frame. A plurality of equally spaced card slots 10 are arranged at the edge of the disc 9. When the lever 12 is away from the radial slots 11 on the disc 9 and the disc 9 is in a stationary state, the card slots 10 on the disc 9 can be connected to the output end of the film rolling device 8. A positioning mechanism for positioning the packaged object is arranged in the card slot 10. The disc 9 is provided with a plurality of radial slots 11 slidably connected to the lever 12. The radial slots 11 are spaced apart from the card slots 10. The lever 12 is arranged on one side of the disc 9. The lever 12 is connected to a first power source 15 for controlling its rotation. The first power source 15 is welded to the frame. Preferably, the first power source 15 is a motor. According to the setting requirements, the first power source 15 can be welded to one end of the lever 12 or to the middle position of the lever 12, so that the lever 12 can shift the disc 9 at one end or at both ends intermittently.

[0043] As attached Figure 1 and attached Figure 4 As shown, the end film folding and heat sealing mechanism comprises a placing plate 28, a push rod 25 placed on the placing plate 28, a clamping plate 35 arranged on both sides of the push rod 25, a baffle plate 29 located at one side edge of the placing plate 28, and a discharge hole 33 arranged below the baffle plate 29. The placing plate 28 is located below the side film folding mechanism, the placing plate 28 is welded to the frame, and the placing plate 28 is arranged horizontally. The push rod 25 is located between the placing plate 28 and the side film folding mechanism, and the end of the push rod 25 away from the baffle plate 29 is connected to a control device for controlling its horizontal linear reciprocating movement. The object to be packaged output by the side film folding mechanism is located on the running path of the push rod 25. The end of the push rod 25 away from the control device is provided with a push plate 27, and slide blocks are welded on both sides of the push plate 27. A side of the clamping plate 35 close to the push rod 25 is provided with a slide groove slidably connected to the slide block. The clamping plate 35 is opposite to the two ends of the object to be packaged, and the end of the clamping plate 35 close to the baffle plate 29 is welded to a second film folding plate 36, and the second film folding plate 36 is located on the opposite surface between the clamping plates 35. The baffle plate 29 is located on the side of the placement plate 28 away from the control device, and a slow rebound reset device is connected between the baffle plate 29 and the frame. The discharge hole 33 is located between the baffle plate 29 and the placement plate 28, and hot air blowers 34 are respectively provided on both sides of the discharge hole 33. The hot air blowers 34 are directly opposite to the two ends of the object to be processed, and the shell of the hot air blower 34 can be welded to the side wall of the discharge hole 33. In this embodiment, it is preferred that the length of the push plate 27 is greater than the distance between the clamping plates 35 at one end close to the control device, so that when the push rod 25 is located on the side away from the placement plate 28 and away from the baffle plate 29, the clamping plates 35 are in an open state to prevent the clamping plates 35 from interfering with the placement of the object to be packaged on the placement plate 28.

[0044] As attached Figure 2 and attached Figure 5 As shown, in the present embodiment, the first side limit assembly 37 and the second side limit assembly 38 have the same structure, the first side limit assembly 37 comprises a first side plate 3 provided at one side of the first conveyor belt 1 and a second side plate 4 provided at the other side of the first conveyor belt 1, the first side plate 3 is parallel to the second side plate 4, the first side plate 3 extends from the conveying head end of the first conveyor belt 1 to the conveying end of the first conveyor belt 1, and the second side plate 4 extends from the conveying head end of the first conveyor belt 1 to the third conveyor belt 5.

[0045] Two first connecting blocks 39 are provided on one side of the first conveyor belt 1, and a first connecting shaft 41 perpendicular to the conveying direction of the first conveyor belt 1 is passed through each first connecting block 39, and the first side plate 3 is fixed on the first connecting shaft 41, and a first locking bolt 40 for locking the first connecting shaft 41 is also provided on the first side plate 3. Two second connecting blocks are provided on the other side of the first conveyor belt 1, and a second connecting shaft perpendicular to the conveying direction of the first conveyor belt 1 is passed through the second connecting block, and a second side plate 4 is fixed on the second connecting shaft, and a second locking bolt for locking the second connecting shaft is also provided on the second side plate 4. The width between the first side plate 3 and the second side plate 4 can be adjusted to limit the position of the boxed medicines of different widths. The adjustment method of the first side plate 3 is as follows: loosen the first locking bolt 40, axially move the first connecting shaft 41 to drive the first side plate 3 to move, and when the first side plate 3 moves to a suitable position, lock the first locking bolt 40. The adjustment method of the second side plate 4 is the same as the adjustment method of the first side plate 3.

[0046] The second side limit assembly 38 includes a third side plate arranged at one side of the top plate and a fourth side plate arranged at the other side of the top plate, the third side plate is parallel to the fourth side plate, the third side plate extends from the third bed to the conveying end of the second conveyor belt 2, and the fourth side plate extends from the conveying head end of the second conveyor belt 2 to the conveying end of the second conveyor belt 2.

[0047] A third connecting block is provided on one side of the second conveyor belt 2, and a third connecting shaft perpendicular to the conveying direction of the second conveyor belt 2 is passed through the third connecting block, and a third side plate is fixed on the third connecting shaft, and a third locking bolt for locking the third connecting shaft is also provided on the third side plate. A fourth connecting block is provided on the other side of the second conveyor belt 2, and a fourth connecting shaft perpendicular to the conveying direction of the second conveyor belt 2 is passed through the fourth connecting block, and a fourth side plate is fixed on the fourth connecting shaft, and a fourth locking bolt for locking the fourth connecting shaft is also provided on the fourth side plate. The width between the third side plate and the fourth side plate can be adjusted to limit the position of the boxed medicines of different widths. The adjustment method of the third side plate is as follows: loosen the third locking bolt, axially move the third connecting shaft to drive the third side plate to move, and when the third side plate moves to a suitable position, lock the third locking bolt. The adjustment method of the fourth side plate is the same as the adjustment method of the third side plate. During operation, it is necessary to ensure that the distance between the first side plate 3 and the second side plate 4 is equal to the distance from the third side plate to the fourth side plate.

[0048] The first connecting block 39, the second connecting block, the third connecting block and the fourth connecting block are adjustable in height up and down. The adjustment method of the first connecting block 39 is used for explanation. The adjustment methods of other connecting blocks are the same as that of the first connecting block 39. The first connecting block 39 is adjusted in height up and down in the following manner: a through slot 42 extending in the up and down direction is provided on the first connecting block 39, and a locking bolt for height adjustment which is threadedly connected to the frame is passed through the through slot 42, and the head of the locking bolt is pressed on the first connecting block 39.

[0049] As attached Figure 1 and attached Figure 3 As shown, the positioning mechanism includes airbags 21 arranged on both sides of the inner wall of the card slot 10, an inflation mechanism placed on the side of each card slot 10, and a limit groove 20 parallel to the end face of the card slot 10. The side wall of the card slot 10 where the airbag 21 needs to be placed can be preferably set as an arc surface that is concave outward to provide a certain placement space for the airbag 21 to prevent the airbag 21 from obstructing the entry of the packaged object into the card slot 10. The airbag 21 is connected to the corresponding adjacent inflation mechanism. The inflation mechanism is preferably an air pump 19. The bottom of the air pump 19 is welded to the end face of the disc 9. The top of the air rod 22 on the air pump 19 is slidably connected to the limit groove 20. The limit groove 20 is annular. The side of the limit groove 20 away from the disc 9 is welded or riveted to the frame. When the air pump 19 rotates with the disc 9, the top of the air rod 22 of the air pump 19 can slide around the limit groove 20. The distance between the side of the limiting groove 20 close to the film rolling device 8 and the end face of the disc 9 is greater than the distance between the other parts of the limiting groove 20 and the end face of the disc 9, so that the air rod 22 of the air pump 19 intermittently inflates or deflates the airbag 21. The distance between the side of the limiting groove 20 close to the end film folding and heat sealing mechanism and the end face of the disc 9 is equal to the distance between the side of the limiting groove 20 close to the film rolling device 8 and the end face of the disc 9.

[0050] In this embodiment, as shown in the attached Figure 1 As shown, the slow rebound reset device means that the rebound is not completed instantaneously, but is realized within a certain period of time. For example, the control method of the cylinder piston running speed can be achieved by controlling the air pressure or gas density or the friction coefficient between the piston plate 31 and the inner wall of the piston cylinder 30. The specific slow rebound reset device can include a piston cylinder 30 placed on the side of the baffle 29 away from the placement plate 28, a piston plate 31 sealed and slidably connected in the piston cylinder 30, and a piston rod 32 arranged between the piston plate 31 and the baffle 29. The baffle 29 is provided with an air hole, and the air hole is connected to the side of the piston cylinder 30 close to the baffle 29 through an air pipe. The air hole is inclined from top to bottom and toward the discharge hole 33. The side of the piston cylinder 30 away from the baffle 29 and the piston plate 31 are filled with closed gas. One end of the piston rod 32 is welded to the piston plate 31, and the other end extends out of the piston cylinder 30 and is welded to the baffle 29.

[0051] The film folding heat sealing device includes a first film folding plate 13 and a heat sealing head 14. The first film folding plate 13 is connected to the first power source 15 through a connecting rod 17, and the heat sealing head 14 is connected to the power source through a connecting rod 2 18. One end of the connecting rod 17 and the connecting rod 2 18 are welded to the output end of the first power source 15, and the other ends of the two are respectively connected to the corresponding first film folding plate 13 and the heat sealing head 14 with a buffer spring. One end of the buffer spring is welded to the corresponding end of the connecting rod, and the other end of the spring is welded to the corresponding first film folding plate 13 or the heat sealing head 14. The connecting rod 17 and the connecting rod 2 18 both rotate with the first power source 15 as the center of the circle. When the film folding heat sealing device rotates, it can abut against the side of the object to be processed in the card slot 10. The lever 12 runs ahead of the film folding heat sealing device, and the film folding plate runs ahead of the heat sealing head 14. When multiple levers 12 are provided, it is preferred that one end of the lever 12 is connected to the first power source 15, so that the number of film folding heat sealing devices is equal to the lever 12, and the lever 12 is spaced apart from the film folding heat sealing devices; another preference is to connect the middle position of the lever body 12 to the first power source 15, so that the number of film folding heat sealing devices is equal to half of the number of levers 12, and the film folding heat sealing devices are also spaced apart from the lever body 12.

[0052] The control device includes a rotating wheel 23, an articulated rod 24 and a limiting hole 26. The rotating wheel 23 is rotatably connected to the frame. The rotating wheel 23 is connected to a second power source 16 for controlling its rotation. The second power source 16 is preferably a motor. One end of the articulated rod 24 is hinged to the edge of the rotating wheel 23, and the other end of the articulated rod 24 is hinged to the push rod 25. The side wall of the limiting hole 26 is welded to the frame, and the push rod 25 passes through the limiting hole 26. The limiting hole 26 ensures that the push rod 25 maintains linear motion, which is the same as the principle of the crank slider mechanism. The rotation speed of the second power source 16 needs to be matched with the rotation speed of the first power source 15 of the side folding and heat sealing mechanism. For example, when the disc rotates one grid (the distance between two adjacent slots or two adjacent objects to be packaged), the rotating wheel rotates one circle to ensure that when the object to be packaged slides from the slot of the disc onto the placement plate, the push rod and the push plate are on the left side of the object to be packaged, and in the process of the rotating wheel rotating one circle to reset the push plate, the lever drives the disc to rotate so that the disc rotates a certain angle to move the object to be packaged in the next slot to face the placement plate, and when the push plate is reset, the object to be packaged in the slot just falls onto the placement plate.

[0053] Specific operation process: the objects to be packaged are placed at the front end of the first conveyor belt 1 manually or mechanically, and the first conveyor belt 1 conveys the objects to be packaged to the end limit plate. At this time, the second push block 7 on the third conveyor belt 5 pushes the objects to be packaged at the end of the first conveyor belt 1 to the top plate of the second conveyor belt 2, and then the first push block 6 on the second conveyor belt 2 pushes the objects to be packaged to the end of the second conveyor belt 2, thereby conveying the objects to be packaged into the film rolling device 8. After the film rolling device 8 performs preliminary film rolling on the objects to be packaged, the objects to be packaged are output to the side folding film heat sealing mechanism.

[0054] Side folding and heat-sealing process: Start the first power source 15, the first power source 15 controls the lever 12 and the connecting rod to rotate, when one end of the lever 12 rotates into the radial groove 11 of the disc 9, the lever 12 slides in the radial groove 11 to drive the disc 9 to rotate, and the disc 9 rotates so that the object to be packaged in the slot 10 rotates accordingly, until the lever 12 slides out of the radial groove 11. At this time, the connecting rod 17 and the connecting rod 2 18 respectively drive the first film folding plate 13 and the heat-sealing head 14 to move toward the edge of the disc 9 as the power source rotates, and then the first film folding plate 13 and the heat-sealing head 14 successively abut against the side of the object to be packaged in the slot 10 of the disc 9 to be processed, and the side film of the object to be packaged is folded and heat-sealed by the abutting pressure. And in the process of the folding film heat sealing device pre-processing, the buffer spring can play a buffering role to prevent the folding film heat sealing device from excessively squeezing the side film of the package to cause film damage, and then the connecting rod 17 and the connecting rod 2 18 continue to rotate to drive the folding film heat sealing device to leave the package.

[0055] Positioning process: Taking the slot 1 on the disc 9 corresponding to the discharge end of the film roll device 8 as an example, the depth of the slot body of the limiting slot 20 on the side close to the film roll device 8 is greater than the distance from the end face of the disc 9 from other parts of the limiting slot 20. The air rod 22 of the air pump 19 arranged on one side of the slot is in a state of being pulled outward due to the position of the limiting slot 20. At this time, the gas in the air bag 21 in the slot 1 is sucked into the corresponding air pump 19, and the air bag 21 is in a contracted state. The material to be packaged delivered from the discharge end of the film roll device 8 can smoothly enter the slot 1. Then the lever 12 drives the disc 9 to rotate, at which time the card slot 1 rotates with the disc 9, and the inflation mechanism corresponding to the card slot 1 rotates with the disc 9, and the top of the gas rod 22 of the inflation mechanism slides along the limit groove 20, thereby moving to a position where the limit groove 20 is closer to the disc 9. At this time, the gas rod 22 is squeezed by the limit groove 20 and retracts to push into the pump 19, thereby squeezing the gas in the pump 19 into the air bag 21, so that the air bag 21 is filled and the object to be packaged in the card slot 1 is squeezed and positioned. Similarly, when the push rod 25 on the inflation mechanism on the side away from the film rolling device 8 is in a state of being pulled outward, and the air bag 21 connected to the corresponding inflation mechanism is in a contracted state, the object to be packaged in the card slot 1 slides out from the card slot 1 and enters the end film folding and heat sealing mechanism.

[0056] End folding and heat sealing process: Start the second power source 16, the second power source 16 drives the rotating wheel 23 to rotate, the rotating wheel 23 drives the hinged rod 24 to move, the hinged rod 24 controls the push rod 25 to move horizontally to the side of the baffle 29, and the push plate 27 moves with the push rod 25, and the push plate 27 pushes the falling objects to be packaged. The push plate 27 pushes the objects to be packaged to the edge of the placement plate 28, so that the objects to be packaged and the baffle 29 are against each other. Then the push rod 25 continues to move to the side where the baffle 29 is located. According to the interaction force between the push rod 25 and the baffle 29 on the objects to be packaged, it is ensured that the objects to be packaged are clamped and will not fall to the discharge hole 33. During the movement of the push rod 25, the clamping plate 35 is connected to the push plate 27, and the push plate 27 moves with the push rod 25. The movement of the push plate 27 drives the clamping plate 35 to rotate to the side close to the push rod 25. When the push rod 25 moves to the limit, the second film folding plate 36 on the clamping plate 35 just butts against the two ends of the object to be packaged, so that the films at the two ends of the object to be packaged are folded.

[0057] When the baffle plate 29 is pushed and moves away from the placement plate 28, the baffle plate 29 drives the piston rod 32 to move synchronously, and the piston rod 32 moves the piston plate 31 away from the placement plate 28. The space in the piston cylinder 30 on the side of the piston plate 31 close to the baffle plate 29 increases, and this space is in a negative pressure state. The space on this side of the piston cylinder 30 applies suction to the packaging through the connected air holes. The enclosed gas in the space on the side of the piston plate 31 away from the baffle plate 29 in the piston cylinder 30 is squeezed by the piston plate 31, and has an opposite force on the piston plate 31.

[0058] When the film folding of the object to be packaged is completed, the rotating wheel 23 controls the push rod 25 to reset to the side away from the baffle 29, the push plate 27 is also reset with the push rod 25, the clamping plate 35 is again opened, and the second film folding plate 36 leaves the end of the object to be packaged. The baffle 29 is no longer subjected to the pressure transmitted by the push plate 27, and the piston rod 32 and the piston plate 31 are also no longer subjected to the pressure of the baffle 29. The piston plate 31 no longer exerts an extrusion force on the enclosed gas in the piston cylinder 30. The force of the enclosed gas on the piston plate 31 causes the piston plate 31 to slowly reset, and the piston plate 31 drives the piston rod 32 to slowly reset. The piston rod 32 moves the baffle 29 to the side close to the placement plate 28 to reset, thereby realizing the slow reset of the baffle 29. During this process, the objects to be packaged are no longer clamped by the push plate 27 and the baffle plate 29, and the negative pressure in the negative pressure space in the piston cylinder 30 gradually weakens, and the suction force applied to the objects to be packaged through the air holes weakens. The objects to be packaged automatically fall into the discharge hole 33 due to their own gravity, and both ends of the objects to be packaged are heat-sealed by the hot air blower 34, completing the packaging process.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat shrink packaging machine, comprising a frame, a feeding mechanism, a film rolling mechanism and an end film folding and heat sealing mechanism, It is characterized in that The feeding mechanism comprises a first conveyor belt, a second conveyor belt adjacent to the side of the first conveyor belt, and a third conveyor belt located at the conveying end of the first conveyor belt, the first conveyor belt and the second conveyor belt are both provided with side limit assemblies, and the third conveyor belt is used to push the objects to be packaged located on the first conveyor belt to the second conveyor belt one by one; The film rolling mechanism includes a film rolling device and a side film folding and heat-sealing mechanism. The film rolling device is located at the conveying end of the second conveyor belt and is used to coat a single object to be packaged. The side film folding and heat-sealing mechanism is correspondingly connected to the discharge end of the film rolling device and is used to complete the film folding and heat-sealing of the side film of the object to be packaged. The end film folding and heat-sealing mechanism is located at one side of the output end of the side film folding and heat-sealing mechanism and is used to fold and heat-seal the films at both ends of the object to be packaged. The side folding film heat sealing mechanism comprises a disc, at least one lever, and at least one folding film heat sealing device. The disc is rotatably connected to the frame, and a plurality of equally spaced slots are arranged at the edge of the disc. When the lever is away and the disc is in a stationary state, the slots on the disc can be correspondingly connected to the output end of the film rolling device, and a positioning mechanism for positioning the object to be packaged is arranged in the slots. The disc is provided with a plurality of radial grooves slidably connected to the lever, and the radial grooves are spaced apart from the card slot. The lever is arranged on one side of the disc, and the lever is connected to a power source for controlling its rotation, and the power source is fixedly arranged on the frame. The film folding heat sealing device is connected to the power source through a connecting rod, and a spring is connected to one end of the connecting rod of the film folding heat sealing device, and the other end of the connecting rod is fixedly connected to the output end of the power source, and rotates with the power source as the center of the circle. When the film folding heat sealing device rotates, it can abut against the side of the object to be processed in the card slot; The folding and heat sealing mechanism comprises a placing plate, a pushing rod placed on the placing plate, a clamping plate arranged on both sides of the pushing rod, a baffle plate located at one edge of the placing plate and a discharge hole arranged below the baffle plate. The placing plate is located below the side folding mechanism, and one end of the pushing rod away from the baffle plate is connected to a control device for controlling its horizontal linear reciprocating movement. The object to be packaged output by the side folding mechanism is located on the running path of the pushing rod, and a pushing plate is provided at one end of the pushing rod away from the control device, and sliding blocks are provided at both sides of the pushing plate. The side of the clamping plate close to the pushing rod is provided with a sliding groove slidably connected to the sliding block, the two ends of the clamping plate are opposite to the two ends of the object to be packaged, and the end of the clamping plate close to the baffle plate is fixedly connected with the film folding plate, and the film folding plate is located on the opposite surface between the clamping plates, and a slow rebound reset device is connected between the baffle plate and the frame, and the discharge hole is located between the baffle plate and the placing plate, and hot air blowers are respectively provided on both sides of the discharge hole, and the hot air blowers are directly opposite to the two ends of the object to be processed.

2. The heat shrink packaging machine according to claim 1, It is characterized in that The first side limit assembly is arranged on the first conveyor belt, and the second side limit assembly is arranged on the second conveyor belt. The first side limit assembly and the second side limit assembly have the same structure. The first side limit assembly includes a first side plate provided on one side of the first conveyor belt and a second side plate provided on the other side of the first conveyor belt, the first side plate is parallel to the second side plate, and the two sides of the first conveyor belt are respectively provided with a first connecting block and a second connecting block; The first connecting block is provided with a first connecting shaft perpendicular to the conveying direction of the first conveyor belt, the first side plate is fixed on the first connecting shaft, and the first side plate is also provided with a first locking bolt for locking the first connecting shaft; The second connecting block is provided with a second connecting shaft perpendicular to the conveying direction of the first conveyor belt, the second side plate is fixed on the second connecting shaft, and the second side plate is also provided with a second locking bolt for locking the second connecting shaft.

3. The heat shrink packaging machine according to claim 1, It is characterized in that A top plate is provided above the second conveyor belt, and its upper surface is flush with the upper surface of the first conveyor belt. A groove is provided in the middle of the top plate and extends along the conveying direction of the second conveyor belt. The second conveyor belt is provided with a plurality of first push blocks that are arranged opposite to the groove and evenly arranged along the conveying direction, and the upper ends of the first push blocks extending into the groove are higher than the upper surface of the top plate.

4. The heat shrink packaging machine according to claim 1, It is characterized in that The positioning mechanism includes air bags arranged on both sides of the inner wall of the slot, an inflation mechanism placed on the side of each slot and a limiting groove parallel to the end face of the slot, the air bags are connected with the corresponding adjacent inflation mechanisms, the inflation mechanism is fixedly arranged on the end face of the disc, a gas rod for pushing the gas is provided on the inflation mechanism, the top of the gas rod is slidably connected to the limiting groove, the limiting groove is a circular ring, and the distance between the side of the limiting groove close to the film rolling device and the end face of the disc is greater than the distance between other parts of the limiting groove and the end face of the disc.

5. The heat shrink packaging machine according to claim 1, It is characterized in that The slow rebound reset device includes a piston cylinder placed on the side of the baffle away from the placement plate, a piston plate sealed and slidably connected in the piston cylinder, and a piston rod arranged between the piston plate and the baffle. The baffle is provided with an air hole, which is connected to the side of the piston cylinder close to the baffle. The air hole is inclined from top to bottom and toward the discharge hole. The side of the piston cylinder away from the baffle and the piston plate is filled with enclosed gas. One end of the piston rod is fixedly connected to the piston plate, and the other end extends out of the piston cylinder and is fixedly connected to the baffle.

6. The heat shrink packaging machine according to claim 4, It is characterized in that The distance between the side of the limiting groove close to the end film folding and heat sealing mechanism and the end surface of the disc is equal to the distance between the side of the limiting groove close to the film rolling device and the end surface of the disc.

7. The heat shrink packaging machine according to claim 1, It is characterized in that The third conveyor belt is provided with a plurality of second push blocks evenly arranged along the conveying direction, and the conveying direction of the third conveyor belt is perpendicular to the conveying direction of the first conveyor belt.

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