Winding film packaging machine

Abstract

The invention relates to the technical field of film packaging, in particular to a wrapping film packaging machine which comprises a control table, a PLC is fixedly installed at the front end of the control table, a vertical frame is fixedly installed at the upper end of the control table, a vertical plate is fixedly installed in the middle of the vertical frame, a core cylinder is arranged at the front end of the vertical plate, and a packaging film is wound on the outer side of the core cylinder. The upper end of the control table is provided with a conveying device used for conveying to-be-packaged pieces, the upper end of the conveying device is provided with a limiting device used for limiting the positions of the to-be-packaged pieces, the packaging machine further comprises a core retreating mechanism, a film changing mechanism and a joint control system, and the core retreating mechanism is arranged at the front end of the vertical plate and can automatically remove empty core barrels when packaging films are used up; the film changing mechanism is arranged at the upper end of the vertical frame and used for installing a new core cylinder with a packaging film, and the joint control system is arranged at the front end of the vertical plate and can make the core withdrawing mechanism and the film changing mechanism intelligently linked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film packaging, in particular to a wrapping film packaging machine. BACKGROUND

[0002] The wrapping film can tightly adhere to the surface of the goods due to its excellent adhesion and ductility, forming a tough and continuous protective film, which can effectively prevent the goods from being damaged due to external factors such as collision, friction, extrusion, moisture, dust invasion, etc. during transportation, handling and storage, and ensure the integrity and quality stability of the goods. At the same time, the wrapping film can firmly integrate scattered or irregularly shaped goods into a stable whole unit, greatly improving the stacking stability of the goods, avoiding safety hazards such as sliding and collapse of the goods when stacked in multiple layers, and ensuring the efficient use of storage space and the personal safety of workers. In addition, the wrapping film packaging operation is simple and fast, which can adapt to the packaging needs of goods of different scales and types, effectively improve the packaging efficiency, reduce the labor and time cost, and also facilitate quick identification and inventory of goods through its transparent property, playing a key role in improving logistics operation efficiency and optimizing supply chain management.

[0003] In traditional packaging operations, the wrapping film of the packaging machine is replaced manually. When manually replacing, the operator needs to spend a lot of time and effort to disassemble the old film core and install the new film core. Disassembling the old one needs to be careful to prevent damage to the parts, and installing the new one needs to be accurately aligned and adjusted for tightness, which is a tedious and error-prone process. Manual operation is subject to the operator's own factors, and the operation proficiency varies. Beginners may need to try repeatedly to install it properly, increasing the replacement time. The reaction speed also has an impact. After the packaging machine prompts to replace the film, the operator who reacts slowly cannot respond in time, resulting in longer downtime. This results in long time-consuming manual replacement and frequent downtime of the packaging machine. When the cargo flow is large, a large number of goods cannot be packaged in time, which may accumulate in the production line or warehouse area, disrupting production and logistics plans, reducing overall packaging efficiency, and disrupting the smoothness of the logistics or production link.

[0004] Therefore, a wrapping film packaging machine is proposed. SUMMARY

[0005] The present application aims to provide a wrapping film packaging machine to solve the problem of low wrapping film replacement efficiency in the background art.

[0006] In order to achieve the above object, the present application provides the following technical scheme: A wrapping film packaging machine, comprising a control console, a PLC controller is fixedly installed at the front end of the control console, a stand is fixedly installed at the upper end of the control console, a vertical plate is fixedly installed at the middle part of the stand, a core barrel is arranged at the front end of the vertical plate, a wrapping film is wound outside the core barrel, a conveying device for conveying the to-be-packaged parts is arranged at the upper end of the control console, a limiting device for limiting the position of the to-be-packaged parts is arranged at the upper end of the conveying device, the packaging machine further comprises a core removing mechanism, a film replacing mechanism and a joint control system, the core removing mechanism is arranged at the front end of the vertical plate and can automatically remove the empty core barrel when the wrapping film is used up, the film replacing mechanism is arranged at the upper end of the stand and is used for installing a new core barrel with wrapping film, and the joint control system is arranged at the front end of the vertical plate and can intelligently link the core removing mechanism and the film replacing mechanism; The core removing mechanism comprises a mounting plate fixedly installed outside the gear ring, a center column is fixedly installed outside the mounting plate, the core barrel is sleeved outside the center column, and a clamping groove is formed in the inner side of the core barrel and arranged in a ring shape. The film replacing mechanism comprises a film box fixedly installed at the upper end of the stand, a feeding port is formed at the upper end of the film box, and a discharging port is formed at the side of the film box close to the vertical plate. The joint control system comprises a position detection mark fixedly installed outside the gear ring, and two groups of position detection sensors are fixedly installed at the left side of the vertical plate.

[0007] Preferably, a servo motor is fixedly installed at the side of the vertical plate, a gear is fixedly connected to the output shaft of the servo motor, the gear is engaged with the gear ring, and the gear ring is rotatably connected to the vertical plate.

[0008] Preferably, two groups of rotating cylinders are rotatably connected to the inside of the center column, a belt pulley is fixedly connected to the outside of each rotating cylinder, and the two groups of belt pulleys are drivingly connected through a belt.

[0009] Preferably, a movable cavity is formed in the inside of the rotating cylinder, two groups of limiting pieces are movably connected in the movable cavity, a clamping column is fixedly connected to the outer side of each limiting piece, the outer end of the clamping column is inserted into the clamping groove, and the clamping groove is formed in the inner wall of the core barrel.

[0010] Preferably, a damping spring is arranged between the two groups of limiting pieces, an inclined gap is formed in the outer end of the clamping column, and the movable cavity and the limiting piece are polygonally arranged.

[0011] Preferably, an equipment cavity is formed in the center column, a stepping motor is fixedly installed in the inside of the equipment cavity, a bevel gear is fixedly connected to the output shaft of the stepping motor, the bevel gear is engaged with a bevel gear ring, and the bevel gear ring is fixedly installed on one group of rotating cylinders.

[0012] Preferably, a first air cylinder is fixedly installed at the right side of the vertical plate, the piston rod of the first air cylinder penetrates through the vertical plate and is fixedly connected with a push plate.

[0013] Preferably, a second cylinder is fixedly installed below the stand, the piston rod of the second cylinder is inserted into the film box, and a push cylinder is fixedly connected.

[0014] Preferably, the position detection mark and the position detection sensor are a reflective sheet and a photoelectric reflective sensor respectively, or are a light shielding sheet and a photoelectric emission sensor respectively, or are a magnetic steel and a Hall sensor respectively.

[0015] The present application has the following beneficial effects: 1. The present application designs a core withdrawing mechanism and a film replacing mechanism, and through the cooperation of the rotation of the clamping column driven by the stepping motor and the push plate pushed by the first cylinder, the empty core cylinder can automatically fall out of the clamping column gap without manual intervention, effectively reducing downtime loss; at the same time, the adaptive structure of the polygonal movable cavity and the limiting sheet avoids accidental changes in the direction of the clamping column gap, facilitates stable structure, and avoids accidental falling.

[0016] 2. The present application designs a film replacing mechanism, and by means of the second cylinder driving the push cylinder, the new core cylinder in the film box can be accurately pushed to the center column and automatically locked, realizing “replace and use”, and solving the production capacity loss caused by traditional downtime film replacement.

[0017] 3. The present application designs a control system cooperating with the core withdrawing mechanism and the film replacing mechanism, relies on the position detection mark fixed on the gear ring and the two groups of position detection sensors on the stand, can accurately position the gear ring, realizes accurate switching of the core withdrawing mechanism and the film replacing mechanism, at the same time, the PLC controller dominates the “core withdrawing-film replacing-resetting” closed-loop control, ensures the orderly connection of the whole process, and the sensor can monitor the equipment state in real time, timely alarm failure and record relevant information, and assist in quickly troubleshooting problems. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a whole three-dimensional schematic view of a wrapping film packaging machine according to an embodiment of the present application. Figure 2 It is a partial three-dimensional schematic view of a wrapping film packaging machine according to an embodiment of the present application. Figure 3 It is a partial three-dimensional schematic view of a wrapping film packaging machine according to an embodiment of the present application. Figure 2 It is an enlarged schematic view of position A in FIG. 6. Figure 4 It is a three-dimensional schematic view of a core withdrawing mechanism of a wrapping film packaging machine according to an embodiment of the present application. Figure 5 It is a top view schematic diagram of a core withdrawing mechanism of a wrapping film packaging machine according to an embodiment of the present application; Figure 6 It is a top view schematic diagram of a core withdrawing mechanism of a wrapping film packaging machine according to an embodiment of the present application; Figure 5 It is a sectional view schematic diagram at B-B of the core withdrawing mechanism; Figure 7 It is a sectional view schematic diagram of the inside of a rotating drum of a wrapping film packaging machine according to an embodiment of the present application; Figure 8 It is a sectional view schematic diagram of the inside of a film changing mechanism of a wrapping film packaging machine according to an embodiment of the present application.

[0020] In the figure, the marks are: 1, control console; 11, PLC controller; 12, stand; 13, stand plate; 14, servo motor; 15, gear; 16, gear ring; 17, core cylinder; 171, clamping groove; 18, wrapping film; 2, conveying device; 3, piece to be packaged; 4, limiting device; 5, core withdrawing mechanism; 51, mounting plate; 52, center column; 521, equipment cavity; 53, rotating drum; 531, pulley; 532, movable cavity; 54, belt; 55, limiting piece; 551, clamping column; 552, damping spring; 56, stepping motor; 561, bevel gear; 57, bevel gear ring; 58, first air cylinder; 59, push plate; 6, film changing mechanism; 61, film box; 611, feeding port; 612, discharging port; 62, second air cylinder; 63, push cylinder; 7, joint control system; 71, position detection mark; 72, position detection sensor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present application should be the commonly understood meanings by those skilled in the art to which the present application belongs. The words "first", "second" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The words "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The words "up", "down", "left", "right" and the like only represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0023] Referring to Figures 1 to 8 The application provides a technical scheme: a wrapping film packaging machine, which comprises a control console 1, a PLC controller 11 is fixedly installed at the front end of the control console 1, a stand 12 is fixedly installed at the upper end of the control console 1, a vertical plate 13 is fixedly installed at the middle part of the stand 12, a core barrel 17 is arranged at the front end of the vertical plate 13, wrapping film 18 is wound outside the core barrel 17, a conveying device 2 for conveying a to-be-packaged piece 3 is arranged at the upper end of the control console 1, a limiting device 4 for limiting the position of the to-be-packaged piece 3 is arranged at the upper end of the conveying device 2, and the packaging machine further comprises a core removing mechanism 5, a film replacing mechanism 6 and a joint control system 7; the core removing mechanism 5 is arranged at the front end of the vertical plate 13 and can automatically remove the empty core barrel 17 when the wrapping film 18 is used up; the film replacing mechanism 6 is arranged at the upper end of the stand 12 and is used for mounting a new core barrel 17 with the wrapping film 18; and the joint control system 7 is arranged at the front end of the vertical plate 13 and can intelligently link the core removing mechanism 5 and the film replacing mechanism 6.

[0024] As an embodiment of the application, as shown in Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , the core removing mechanism 5 comprises a mounting plate 51 fixedly installed outside the tooth ring 16, a center column 52 is fixedly installed outside the mounting plate 51, the core barrel 17 is sleeved outside the center column 52, a clamping groove 171 is formed in the inner side of the core barrel 17, the clamping groove 171 is arranged in a ring shape, a servo motor 14 is fixedly installed on the side of the vertical plate 13, a gear 15 is fixedly connected to the output shaft of the servo motor 14, the gear 15 is engaged with the tooth ring 16, the tooth ring 16 is rotationally connected to the vertical plate 13, two groups of rotating cylinders 53 are rotationally connected in the center column 52, a belt pulley 531 is fixedly connected to the outer side of the rotating cylinder 53, the two groups of belt pulleys 531 are drivingly connected through a belt 54, an active cavity 532 is formed in the rotating cylinder 53, two groups of limiting pieces 55 are movably connected in the active cavity 532, a clamping column 551 is fixedly connected to the outer side of the limiting piece 55, the outer end of the clamping column 551 is inserted into the clamping groove 171, the clamping groove 171 is formed in the inner wall of the core barrel 17, a damping spring 552 is arranged between the two groups of limiting pieces 55, an inclined gap is formed in the outer end of the clamping column 551, the active cavity 532 and the limiting piece 55 are both polygonally arranged, an equipment cavity 521 is formed in the center column 52, a stepping motor 56 is fixedly installed in the inner part of the equipment cavity 521, a bevel gear 561 is fixedly connected to the output shaft of the stepping motor 56, the bevel gear 561 is engaged with a bevel gear ring 57, the bevel gear ring 57 is fixedly installed on one group of rotating cylinders 53, a first air cylinder 58 is fixedly installed on the right side of the vertical plate 13, the piston rod of the first air cylinder 58 penetrates through the vertical plate 13 and is fixedly connected with a push plate 59.

[0025] By adopting the above technical scheme, when the core barrel 17 with the used packaging film 18 needs to be removed, first, the PLC controller 11 controls the step motor 56 to start, and the step motor 56 drives the bevel gear 561 to rotate by 180 degrees. Because the bevel gear 561 meshes with the bevel gear ring 57 on the rotating drum 53, the step motor 56 drives the rotating drum 53 to rotate by 180 degrees. Because the two groups of rotating drums 53 are drivingly connected through the belt pulley 531 and the belt 54, the two groups of rotating drums 53 rotate by 180 degrees at the same time. Then, because the movable cavity 532 and the limiting piece 55 are both polygonally arranged, the clamping column 551 rotates by 180 degrees with the rotating drum 53, so that the outer end gap of the clamping column 551 faces the gear ring 16. Finally, the PLC controller 11 controls the first air cylinder 58 to start, and the first air cylinder 58 drives the core barrel 17 on the center column 52 through the push plate 59. Because the outer end gap of the clamping column 551 faces the gear ring 16, the inner wall of the clamping groove 171 on the core barrel 17 can overcome the rebound force of the damping spring 552 and press the clamping column 551 into the center column 52 along the outer end gap of the clamping column 551, so that the core barrel 17 can be separated from the center column 52, which is beneficial to realize the full automation and high compatibility of the empty core barrel 17 processing. Through the cooperation design of the step motor 56 driving the clamping column 551 to rotate and the first air cylinder 58 driving the push plate 59, the empty core barrel 17 can be automatically separated along the gap of the clamping column 551, without manual intervention, which effectively reduces the downtime loss. At the same time, the adaptive structure of the polygonal movable cavity 532 and the limiting piece 55 avoids the gap of the clamping column 551 from changing unexpectedly, which is convenient and stable, and avoids accidental falling.

[0026] As an embodiment of the present application, as shown in Figure 1 and Figure 8 The film replacing mechanism 6 includes a film box 61 fixedly installed on the upper end of the stand 12. The upper end of the film box 61 is provided with an inlet 611, and the side of the film box 61 close to the vertical plate 13 is provided with an outlet 612. A second air cylinder 62 is fixedly installed below the stand 12, the piston rod of the second air cylinder 62 is inserted into the film box 61, and a push barrel 63 is fixedly connected. The right side of the push barrel 63 is opposite to the core barrel 17 and the packaging film 18.

[0027] By adopting the above technical scheme, when a new cartridge 17 with a packaging film 18 needs to be replaced, the PLC controller 11 controls the film replacing mechanism 6 to start, the step motor 56 drives the clamping column 551 to rotate by 180 degrees, so that the outer end gap of the clamping column 551 faces the film box 61 direction, then the PLC controller 11 controls the second air cylinder 62 to start, the piston rod of the second air cylinder 62 pushes the new cartridge 17 with the packaging film 18 to the center column 52 through the push barrel 63, and because the outer end gap of the clamping column 551 faces the film box 61 direction, the clamping groove 171 on the inner side of the cartridge 17 cannot be separated from the center column 52 outward, so that the clamping column 551 can lock the new cartridge 17, and because the cartridge 17 is annular, it does not affect the rotation of the cartridge 17 on the center column 52, which is beneficial to the driving of the push barrel 63 by the second air cylinder 62, so that the new cartridge 17 in the film box 61 can be quickly and accurately pushed to the center column 52 and automatically locked, realizing "replace and use", and solving the production capacity loss caused by traditional shutdown and film replacement.

[0028] As an embodiment of the present application, as shown in Figure 1 、 Figure 2 and Figure 3 , the joint control system 7 includes a position detection mark 71 fixedly installed on the outer side of the gear ring 16, and two symmetrical groups of position detection sensors 72 fixedly installed on the left side of the vertical plate 13. The position detection mark 71 and the position detection sensor 72 are respectively a reflective sheet and a photoelectric reflective sensor, or a light-shielding sheet and a photoelectric emission sensor, or a magnetic steel and a Hall sensor.

[0029] By adopting the above technical scheme, when the PLC controller 11 controls the position detection sensor 72 at the rear end of the gear ring 16 to start, the position detection sensor 72 records the position detection mark 71 and transmits the information to the PLC controller 11, and the PLC controller 11 controls the servo motor 14 to close, so that the mounting plate 51 on the side of the gear ring 16 stays at the lowest position, creating conditions for the core removing mechanism 5 to remove the empty cartridge 17, when the PLC controller 11 controls the position detection sensor 72 at the front end of the gear ring 16 to start, the position detection sensor 72 records the position detection mark 71 and transmits the information to the PLC controller 11, and the PLC controller 11 controls the servo motor 14 to close, so that the mounting plate 51 on the side of the gear ring 16 stays at the highest position, creating conditions for the film replacing mechanism 6 to replace the new cartridge 17, which is beneficial to the efficient cooperation and stable operation of multiple mechanisms through intelligent design, and the position of the gear ring 16 can be accurately positioned by relying on the position detection mark 71 fixed on the gear ring 16 and the two groups of position detection sensors 72 on the vertical plate 13, realizing accurate switching of the core removing and film replacing stations; at the same time, the PLC controller 11 leads the "core removing-film replacing-resetting" closed-loop control, ensuring the orderly connection of the whole process, and the sensor can monitor the equipment state in real time, timely alarm failure and record relevant information, and assist in quickly troubleshooting problems.

[0030] Working principle: when the core barrel 17 with the used packaging film 18 needs to be removed, first, the PLC controller 11 controls the step motor 56 to start, and the step motor 56 drives the bevel gear 561 to rotate by 180 degrees. Because the bevel gear 561 meshes with the bevel gear ring 57 on the rotating drum 53, the step motor 56 drives the rotating drum 53 to rotate by 180 degrees. Because the two groups of rotating drums 53 are connected through the belt pulley 531 and the belt 54, the two groups of rotating drums 53 rotate by 180 degrees at the same time. Then, because the movable cavity 532 and the limiting piece 55 are both polygonal, the clamping column 551 rotates by 180 degrees with the rotating drum 53, so that the outer end gap of the clamping column 551 faces the gear ring 16. Finally, the PLC controller 11 controls the first air cylinder 58 to start, and the first air cylinder 58 pushes the core barrel 17 on the center column 52 through the push plate 59. Because the outer end gap of the clamping column 551 faces the gear ring 16, the inner wall of the clamping groove 171 on the core barrel 17 can overcome the rebound force of the damping spring 552 and press the clamping column 551 into the center column 52 along the outer end gap of the clamping column 551, so that the core barrel 17 can be separated from the center column 52. When a new core barrel 17 with a packaging film 18 needs to be replaced, the PLC controller 11 controls the film replacing mechanism 6 to start, and the step motor 56 drives the clamping column 551 to rotate by 180 degrees, so that the outer end gap of the clamping column 551 faces the film box 61. Then, the PLC controller 11 controls the second air cylinder 62 to start, and the piston rod of the second air cylinder 62 pushes the new core barrel 17 with the packaging film 18 onto the center column 52 through the push barrel 63. Because the outer end gap of the clamping column 551 faces the film box 61, the clamping groove 171 on the inside of the core barrel 17 cannot be separated from the center column 52 outward, so that the clamping column 551 can lock the new core barrel 17. Because the core barrel 17 is annular, it does not affect the rotation of the core barrel 17 on the center column 52. When the PLC controller 11 controls the position detection sensor 72 at the rear end of the gear ring 16 to start, the position detection sensor 72 records the position detection mark 71 and transmits the information to the PLC controller 11. The PLC controller 11 controls the servo motor 14 to stop, so that the mounting plate 51 on the side of the gear ring 16 stays at the lowest position, creating conditions for the core removing mechanism 5 to remove the empty core barrel 17. When the PLC controller 11 controls the position detection sensor 72 at the front end of the gear ring 16 to start, the position detection sensor 72 records the position detection mark 71 and transmits the information to the PLC controller 11. The PLC controller 11 controls the servo motor 14 to stop, so that the mounting plate 51 on the side of the gear ring 16 stays at the highest position, creating conditions for the film replacing mechanism 6 to replace the new core barrel 17.

[0031] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0032] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A winding film packaging machine, comprising a control console (1), a PLC controller (11) is fixedly installed at the front end of the control console (1), a stand (12) is fixedly installed at the upper end of the control console (1), a vertical plate (13) is fixedly installed at the middle part of the stand (12), a core barrel (17) is arranged at the front end of the vertical plate (13), a packaging film (18) is wound on the outer side of the core barrel (17), a conveying device (2) for conveying the to-be-packaged pieces (3) is arranged at the upper end of the control console (1), and a limiting device (4) for limiting the position of the to-be-packaged pieces (3) is arranged at the upper end of the conveying device (2), characterized in that: the packaging machine further comprises a core removing mechanism (5), a film replacing mechanism (6) and a joint control system (7), the core removing mechanism (5) is arranged at the front end of the vertical plate (13) and can automatically remove the empty core barrel (17) when the packaging film (18) is used up, the film replacing mechanism (6) is arranged at the upper end of the stand (12) and is used for installing a new core barrel (17) with the packaging film (18), and the joint control system (7) is arranged at the front end of the vertical plate (13) and can intelligently link the core removing mechanism (5) and the film replacing mechanism (6); the core removing mechanism (5) comprises a mounting plate (51) fixedly installed on the outer side of a gear ring (16), a center column (52) fixedly installed on the outer side of the mounting plate (51), and a core barrel (17) sleeved on the outer side of the center column (52), wherein a clamping groove (171) is formed in the inner side of the core barrel (17) and arranged in an annular shape; the film replacing mechanism (6) comprises a film box (61) fixedly installed at the upper end of the stand (12), an inlet (611) formed at the upper end of the film box (61), and an outlet (612) formed at the side of the film box (61) close to the vertical plate (13); the joint control system (7) comprises position detection marks (71) fixedly installed on the outer side of the gear ring (16), and two groups of position detection sensors (72) fixedly installed on the left side of the vertical plate (13).

2. A wrapping film packaging machine according to claim 1, characterized in that A servo motor (14) is fixedly installed on the side of the vertical plate (13), a gear (15) is fixedly connected to the output shaft of the servo motor (14), the gear (15) is engaged with the gear ring (16), and the gear ring (16) is rotationally connected to the vertical plate (13).

3. A wrap-around film packaging machine according to claim 2, characterized in that Two groups of rotating cylinders (53) are rotationally connected in the center column (52), a belt pulley (531) is fixedly connected to the outer side of each rotating cylinder (53), and the two groups of belt pulleys (531) are drivingly connected through a belt (54).

4. A wrap-around film packaging machine according to claim 3, characterized in that An active cavity (532) is formed in the rotating cylinder (53), two groups of limiting pieces (55) are movably connected in the active cavity (532), a clamping column (551) is fixedly connected to the outer side of each limiting piece (55), the outer end of the clamping column (551) is inserted into the clamping groove (171), and the clamping groove (171) is formed in the inner wall of the core barrel (17).

5. A wrap-around film packaging machine according to claim 4, characterized in that The two groups of limiting sheets (55) are provided with damping springs (552), the outer side end of the clamping column (551) is provided with an inclined gap, and the movable cavity (532) and the limiting sheet (55) are both polygonally arranged.

6. A wrap-around film packaging machine according to claim 1, characterized in that, A device cavity (521) is arranged in the central column (52), a stepping motor (56) is fixedly installed in the device cavity (521), the output shaft of the stepping motor (56) is fixedly connected with a bevel gear (561), the bevel gear (561) is engaged with a bevel gear ring (57), and the bevel gear ring (57) is fixedly installed on a group of rotating cylinders (53).

7. A wrap-around film packaging machine according to claim 6, characterized in that The right side of the vertical plate (13) is fixedly installed with a first air cylinder (58), the piston rod of the first air cylinder (58) penetrates through the vertical plate (13) and is fixedly connected with a push plate (59).

8. A stretch wrap packaging machine according to claim 1, wherein, The lower side of the stand (12) is fixedly installed with a second air cylinder (62), the piston rod of the second air cylinder (62) is inserted into the film box (61) and is fixedly connected with a push cylinder (63), and the right side of the push cylinder (63) is opposite to the core cylinder (17) and the packaging film (18).

9. A stretch wrap packaging machine according to claim 1, wherein, The position detection mark (71) and the position detection sensor (72) are respectively a reflective sheet and a photoelectric reflection type sensor, or are respectively a light shielding sheet and a photoelectric emission type sensor, or are respectively a magnetic steel and a Hall sensor.

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