A stretch wrapping machine

Abstract

This invention relates to the field of film packaging technology, specifically to a stretch wrapping machine, including a control console. A PLC controller is fixedly installed at the front end of the control console, a vertical frame is fixedly installed at the upper end of the control console, a vertical plate is fixedly installed in the middle of the vertical frame, a core tube is provided at the front end of the vertical plate, and packaging film is wrapped around the outer side of the core tube. A conveying device for conveying the packaged item is provided at the upper end of the control console, and a limiting device for restricting the position of the packaged item is provided at the upper end of the conveying device. The packaging machine also includes a core removal mechanism, a film changing mechanism, and a control system. The core removal mechanism is located at the front end of the vertical plate and can automatically remove empty core tubes when the packaging film is used up. The film changing mechanism is located at the upper end of the vertical frame and is used to install new core tubes with packaging film. The control system is located at the front end of the vertical plate and can enable intelligent linkage between the core removal mechanism and the film changing mechanism.

Description

Technical Field

[0001] This invention relates to the field of film packaging technology, and in particular to a stretch wrapping machine. Background Technology

[0002] Stretch film, with its excellent adhesion and extensibility, can tightly adhere to the surface of goods, forming a tough and continuous protective film. This effectively prevents damage to goods during transportation, handling, and storage due to external factors such as collision, friction, squeezing, moisture, and dust intrusion, ensuring the integrity and quality stability of the goods. Simultaneously, stretch film can firmly integrate scattered or irregularly shaped goods into a stable unit, greatly improving the stacking stability of goods and preventing safety hazards such as slippage or collapse when goods are stacked in multiple layers. This ensures efficient utilization of warehouse space and the personal safety of personnel. Furthermore, stretch film packaging is simple and quick to operate, adapting to the packaging needs of goods of different sizes and types, effectively improving packaging efficiency, reducing labor and time costs, and its transparency facilitates rapid identification and inventory checks of goods. It plays a crucial role in improving logistics efficiency and optimizing supply chain management.

[0003] In traditional packaging operations, the replacement of stretch film on packaging machines is mostly done manually. Manual replacement requires operators to spend a significant amount of time and effort disassembling the old film core and installing the new one. Disassembling the old film requires careful handling to avoid damaging parts, while installing the new film requires precise alignment and tension adjustment—a process that is tedious and allows no room for error. Manual operation is also limited by the operator's skill level; varying levels of proficiency mean that novices may need to attempt the replacement repeatedly, increasing replacement time. Reaction speed also plays a role; slow-reacting operators may not respond promptly to the machine's replacement prompts, leading to longer downtime. This results in time-consuming manual replacements and frequent machine downtime. During periods of high volume, large quantities of goods cannot be packaged promptly, potentially accumulating on the production line or in the warehouse, disrupting production and logistics plans, reducing overall packaging efficiency, and impeding the smooth flow of logistics or production processes.

[0004] Therefore, a stretch film packaging machine is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a stretch film packaging machine to solve the problem of low efficiency in changing stretch film mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stretch film packaging machine, including a control console, a PLC controller fixedly installed at the front end of the control console, a vertical frame fixedly installed at the upper end of the control console, a vertical plate fixedly installed in the middle of the vertical frame, a core tube provided at the front end of the vertical plate, a packaging film wrapped around the outer side of the core tube, a conveying device for conveying the packaged item provided at the upper end of the control console, a limiting device for limiting the position of the packaged item provided at the upper end of the conveying device, the packaging machine further including a core removal mechanism, a film changing mechanism, and a control system, the core removal mechanism being located at the front end of the vertical plate, which can automatically remove empty core tubes when the packaging film is used up, the film changing mechanism being located at the upper end of the vertical frame, which is used to install new core tubes with packaging film, and the control system being located at the front end of the vertical plate, which enables the core removal mechanism and the film changing mechanism to be intelligently linked;

[0007] The core removal mechanism includes a mounting plate fixedly installed on the outer side of the toothed ring, a central column fixedly installed on the outer side of the mounting plate, a core cylinder sleeved on the outer side of the central column, and a slot formed on the inner side of the core cylinder.

[0008] The membrane changing mechanism includes a membrane box fixedly installed on the upper end of the upright. The upper end of the membrane box has a feed inlet, and the side of the membrane box near the upright plate has a discharge outlet.

[0009] The control system includes position detection markers fixedly installed on the outer side of the gear ring, and two sets of symmetrical position detection sensors fixedly installed on the left side of the upright plate.

[0010] Preferably, a servo motor is fixedly installed on the side of the upright plate, and the output shaft of the servo motor is fixedly connected to a gear, which meshes with a gear ring, and the gear ring is rotatably connected to the upright plate.

[0011] Preferably, the central column has two sets of rotating drums rotatably connected inside, and pulleys are fixedly connected to the outside of the rotating drums. The two sets of pulleys are connected by belt drive.

[0012] Preferably, the rotating drum has an internal movable cavity, and two sets of limiting plates are movably connected inside the movable cavity. The outer side of the limiting plates is fixedly connected to a locking post, and the outer end of the locking post is inserted into a locking groove, which is opened on the inner wall of the core cylinder.

[0013] Preferably, a damping spring is provided between the two sets of limiting plates, and an inclined notch is opened at the outer end of the locking post. Both the movable cavity and the limiting plates are polygonal in shape.

[0014] Preferably, the central column has an equipment cavity, a stepper motor is fixedly installed inside the equipment cavity, the output shaft of the stepper motor is fixedly connected to a bevel gear, the bevel gear meshes with a bevel gear ring, and the bevel gear ring is fixedly installed on a set of rotating drums.

[0015] Preferably, a first cylinder is fixedly installed on the right side of the upright plate, the piston rod of the first cylinder passes through the upright plate and is fixedly connected to a push plate.

[0016] Preferably, a second cylinder is fixedly installed below the upright frame. The piston rod of the second cylinder is inserted into the film box and is fixedly connected to a pusher. The right side of the pusher is directly opposite the core tube and the packaging film.

[0017] Preferably, the position detection mark and the position detection sensor are a reflector and a photoelectric reflective sensor, or a light shield and a photoelectric emitting sensor, or a magnet and a Hall sensor, respectively.

[0018] The beneficial effects of this invention are:

[0019] 1. This invention, through the design of a core removal mechanism in conjunction with a film changing mechanism, and the coordinated design of a stepper motor driving the rotation of the clamping post and a first cylinder pushing the push plate, allows the hollow cylinder to automatically detach along the notch of the clamping post without manual intervention, effectively reducing downtime losses; at the same time, the matching structure of the polygonal movable cavity and the limiting plate prevents the clamping post notch from changing its orientation accidentally, facilitating structural stability and preventing accidental detachment.

[0020] 2. This invention, through the design of a membrane replacement mechanism, uses a second cylinder to drive a pusher, which can quickly and accurately push the new core tube in the membrane box to the central column and automatically lock it, achieving "ready to use immediately after replacement" and solving the production capacity loss caused by traditional downtime membrane replacement.

[0021] 3. This invention designs a joint control system to work with the core removal mechanism and the film changing mechanism. Relying on the position detection mark fixed on the toothed ring and two sets of position detection sensors on the upright plate, the toothed ring position can be accurately located to achieve accurate switching between the core removal and film changing stations. At the same time, the PLC controller leads the closed-loop control of "core removal-film changing-reset" to ensure the orderly connection of the entire process. Moreover, the sensors can monitor the equipment status in real time, give timely warnings of faults and record relevant information to assist in the rapid troubleshooting of problems. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional schematic diagram of a stretch film packaging machine according to an embodiment of the present invention;

[0024] Figure 2 This is a partial perspective view of a stretch film packaging machine according to an embodiment of the present invention;

[0025] Figure 3 An embodiment of the present invention provides a stretch film packaging machine. Figure 2Enlarged view of point A in the middle;

[0026] Figure 4 This is a three-dimensional schematic diagram of a core-removing mechanism of a stretch film packaging machine according to an embodiment of the present invention;

[0027] Figure 5 This is a top view schematic diagram of the core-removing mechanism of a stretch film packaging machine according to an embodiment of the present invention;

[0028] Figure 6 An embodiment of the present invention provides a stretch film packaging machine. Figure 5 Schematic diagram of cross-section at point BB;

[0029] Figure 7 This is a three-dimensional cross-sectional view of the inside of the drum of a stretch wrapping machine according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic cross-sectional view of the film changing mechanism of a stretch wrapping machine according to an embodiment of the present invention.

[0031] The following are labeled in the diagram: 1. Control console; 11. PLC controller; 12. Stand; 13. Stand plate; 14. Servo motor; 15. Gear; 16. Gear ring; 17. Core cylinder; 171. Slot; 18. Packaging film;

[0032] 2. Conveying device; 3. Package to be packaged; 4. Restricting device;

[0033] 5. Core removal mechanism; 51. Mounting plate; 52. Central column; 521. Equipment cavity; 53. Rotary drum; 531. Pulley; 532. Movable cavity; 54. Belt; 55. Limiting plate; 551. Locking post; 552. Damping spring; 56. Stepper motor; 561. Bevel gear; 57. Bevel gear ring; 58. First cylinder; 59. Push plate;

[0034] 6. Membrane changing mechanism; 61. Membrane box; 611. Feed inlet; 612. Discharge outlet; 62. Second cylinder; 63. Push cylinder;

[0035] 7. Joint control system; 71. Position detection marker; 72. Position detection sensor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0037] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Please see Figures 1 to 8 The present invention provides a technical solution: a stretch wrapping machine, including a control console 1, a PLC controller 11 fixedly installed at the front end of the control console 1, a stand 12 fixedly installed at the upper end of the control console 1, a stand plate 13 fixedly installed in the middle of the stand 12, a core tube 17 provided at the front end of the stand plate 13, a packaging film 18 wrapped around the outer side of the core tube 17, a conveying device 2 for conveying the packaged item 3 provided at the upper end of the control console 1, a limiting device 4 for limiting the position of the packaged item 3 provided at the upper end of the conveying device 2, the packaging machine also includes a core removal mechanism 5, a film changing mechanism 6 and a control system 7, the core removal mechanism 5 is located at the front end of the stand plate 13 and can automatically remove the empty core tube 17 when the packaging film 18 is used up, the film changing mechanism 6 is located at the upper end of the stand 12 and is used to install a new core tube 17 with packaging film 18, the control system 7 is located at the front end of the stand plate 13 and can enable the core removal mechanism 5 and the film changing mechanism 6 to intelligently link together.

[0039] As one embodiment of the present invention, such as Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, the core removal mechanism 5 includes a mounting plate 51 fixedly installed on the outer side of the gear ring 16. A central column 52 is fixedly installed on the outer side of the mounting plate 51. A core cylinder 17 is sleeved on the outer side of the central column 52. A slot 171 is formed on the inner side of the core cylinder 17. The slot 171 is arranged in a ring shape. A servo motor 14 is fixedly installed on the side of the upright plate 13. A gear 15 is fixedly connected to the output shaft of the servo motor 14. The gear 15 meshes with the gear ring 16. The gear ring 16 is rotatably connected to the upright plate 13. Two sets of rotating cylinders 53 are rotatably connected inside the central column 52. A pulley 531 is fixedly connected to the outer side of the rotating cylinder 53. The two sets of pulleys 531 are connected by a belt 54. A movable cavity 532 is formed inside the rotating cylinder 53. Two sets of limiting plates 5 are movably connected in the movable cavity 532. 5. A locking post 551 is fixedly connected to the outer side of the limiting plate 55. The outer end of the locking post 551 is inserted into the locking groove 171, which is opened on the inner wall of the core cylinder 17. A damping spring 552 is provided between the two sets of limiting plates 55. An inclined notch is opened at the outer end of the locking post 551. The movable cavity 532 and the limiting plate 55 are both polygonal. An equipment cavity 521 is opened in the center column 52. A stepper motor 56 is fixedly installed inside the equipment cavity 521. A bevel gear 561 is fixedly connected to the output shaft of the stepper motor 56. The bevel gear 561 meshes with a bevel ring 57. The bevel ring 57 is fixedly installed on a set of rotating cylinders 53. A first cylinder 58 is fixedly installed on the right side of the upright plate 13. The piston rod of the first cylinder 58 passes through the upright plate 13 and is fixedly connected to a push plate 59.

[0040] By adopting the above technical solution, when it is necessary to remove the core tube 17 after the packaging film 18 has been used up, firstly, the PLC controller 11 controls the stepper motor 56 to start, and the stepper motor 56 drives the bevel gear 561 to rotate 180 degrees. Because the bevel gear 561 meshes with the bevel gear ring 57 on the rotating drum 53, the stepper motor 56 drives the rotating drum 53 to rotate 180 degrees. Since the two sets of rotating drums 53 are connected by pulley 531 and belt 54, the two sets of rotating drums 53 rotate 180 degrees simultaneously. Then, since the movable cavity 532 and the limiting piece 55 are both polygonal, the locking post 551 rotates 180 degrees with the rotating drum 53, so that the outer end notch of the locking post 551 faces the gear ring 16. Finally, the PLC controller 11 controls the first cylinder 58 to start, and the first cylinder 58 is activated by the push plate 5. The core cylinder 17 on the central column 52 is pushed. Since the outer end notch of the locking post 551 faces the toothed ring 16, the inner wall of the locking groove 171 on the core cylinder 17 can overcome the rebound force of the damping spring 552 and press the locking post 551 into the central column 52 along the outer end notch of the locking post 551. This allows the core cylinder 17 to detach from the central column 52, which is conducive to the full automation and high compatibility of the hollow core cylinder 17 processing. The design of the stepper motor 56 driving the locking post 551 to rotate and the first cylinder 58 pushing the push plate 59 allows the hollow core cylinder 17 to automatically detach along the notch of the locking post 551 without manual intervention, effectively reducing downtime losses. At the same time, the matching structure of the polygonal movable cavity 532 and the limiting piece 55 prevents the orientation of the notch of the locking post 551 from changing unexpectedly, which facilitates the stabilization of the structure and prevents accidental detachment.

[0041] As one embodiment of the present invention, such as Figure 1 and Figure 8 As shown, the film changing mechanism 6 includes a film box 61 fixedly installed on the upper end of the upright 12. The upper end of the film box 61 has a feed port 611, and the side of the film box 61 near the upright plate 13 has a discharge port 612. A second cylinder 62 is fixedly installed below the upright 12. The piston rod of the second cylinder 62 is inserted into the film box 61 and is fixedly connected to a push cylinder 63. The right side of the push cylinder 63 faces the core cylinder 17 and the packaging film 18.

[0042] By adopting the above technical solution, when a new core cylinder 17 with packaging film 18 needs to be replaced, the PLC controller 11 controls the film changing mechanism 6 to start, the stepper motor 56 drives the clamping post 551 to rotate 180 degrees, so that the outer end notch of the clamping post 551 faces the film box 61. Then, the PLC controller 11 controls the second cylinder 62 to start, and the piston rod of the second cylinder 62 pushes the new core cylinder 17 with packaging film 18 onto the central post 52 through the pusher 63. And because the outer end notch of the clamping post 551... With the end notch facing the membrane box 61, the slot 171 inside the core tube 17 cannot disengage from the central column 52, allowing the locking post 551 to lock the new core tube 17. Moreover, because the core tube 17 is annular, it does not affect the rotation of the core tube 17 on the central column 52. This facilitates the use of the second cylinder 62 to drive the pusher 63, which can quickly and accurately push the new core tube 17 in the membrane box 61 to the central column 52 and automatically lock it, achieving "ready to use immediately after replacement" and solving the production capacity loss caused by traditional downtime for membrane replacement.

[0043] As one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 3 As shown, the control system 7 includes a position detection mark 71 fixedly installed on the outer side of the toothed ring 16, and two sets of symmetrical position detection sensors 72 fixedly installed on the left side of the upright plate 13. The position detection mark 71 and the position detection sensor 72 are respectively a reflector and a photoelectric reflective sensor, or a light shield and a photoelectric emission sensor, or a magnet and a Hall sensor.

[0044] By adopting the above technical solution, 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 then controls the servo motor 14 to shut down, causing the mounting plate 51 on the side of the gear ring 16 to stay at its lowest position, creating conditions for the core removal mechanism 5 to remove the hollow core cylinder 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 then controls the servo motor 14 to shut down, causing the mounting plate 51 on the side of the gear ring 16 to stop at its lowest position, creating conditions for the core removal mechanism 5 to remove the hollow core cylinder 17. The servo motor 14 is shut down, causing the mounting plate 51 on the side of the gear ring 16 to remain at its highest position, creating conditions for the film changing mechanism 6 to replace the new core cylinder 17. This facilitates efficient collaboration and stable operation of multiple mechanisms through intelligent design. Relying on the position detection mark 71 fixed on the gear ring 16 and the two sets of position detection sensors 72 on the upright plate 13, the position of the gear ring 16 can be accurately located, realizing accurate switching between the core removal and film changing stations. At the same time, the PLC controller 11 leads the closed-loop control of "core removal-film changing-reset", ensuring orderly connection of the entire process. The sensors can monitor the equipment status in real time, promptly warn of faults and record relevant information to assist in rapid troubleshooting.

[0045] Working principle: When the core tube 17 of the packaging film 18 needs to be removed, the PLC controller 11 first controls the stepper motor 56 to start. The stepper motor 56 drives the bevel gear 561 to rotate 180 degrees. Because the bevel gear 561 meshes with the bevel ring 57 on the rotating drum 53, the stepper motor 56 drives the rotating drum 53 to rotate 180 degrees. Since the two sets of rotating drums 53 are connected by pulley 531 and belt 54, the two sets of rotating drums 53 rotate 180 degrees simultaneously. Then, because the movable cavity 532 and the limiting piece 55 are both polygonal in shape... Therefore, the locking pin 551 rotates 180 degrees with the rotating drum 53, so that the outer end notch of the locking pin 551 faces the toothed ring 16. Finally, the PLC controller 11 controls the first cylinder 58 to start. The first cylinder 58 pushes the core cylinder 17 on the central column 52 through the push plate 59. Since the outer end notch of the locking pin 551 faces the toothed ring 16, the inner wall of the locking groove 171 on the core cylinder 17 can overcome the rebound force of the damping spring 552 and press the locking pin 551 into the central column 52 along the outer end notch of the locking pin 551, so that the core cylinder 17 can be separated from the central column 52.

[0046] When a new core cylinder 17 with packaging film 18 needs to be replaced, the PLC controller 11 controls the film changing mechanism 6 to start. The stepper motor 56 drives the locking post 551 to rotate 180 degrees, so that the outer end notch of the locking post 551 faces the film box 61. Then, the PLC controller 11 controls the second cylinder 62 to start. The piston rod of the second cylinder 62 pushes the new core cylinder 17 with packaging film 18 onto the central post 52 through the pusher 63. Because the outer end notch of the locking post 551 faces the film box 61, the locking groove 171 on the inner side of the core cylinder 17 cannot disengage from the central post 52, so that the locking post 551 can lock the new core cylinder 17. Moreover, because the core cylinder 17 is annular, it does not affect the rotation of the core cylinder 17 on the central post 52.

[0047] 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 turn off, so that the mounting plate 51 on the side of the gear ring 16 stays at the lowest position, creating conditions for the core removal mechanism 5 to remove the hollow core cylinder 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 turn off, so that the mounting plate 51 on the side of the gear ring 16 stays at the highest position, creating conditions for the film changing mechanism 6 to replace the new core cylinder 17.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. 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 can be understood by those skilled in the art.

Claims

1. A stretch wrapping machine, comprising a control console (1), wherein a PLC controller (11) is fixedly installed at the front end of the control console (1), a support frame (12) is fixedly installed at the upper end of the control console (1), a support plate (13) is fixedly installed in the middle of the support frame (12), a core cylinder (17) is provided at the front end of the support plate (13), and a packaging film (18) is wrapped around the outer side of the core cylinder (17), and a conveying device (2) for conveying a package (3) is provided at the upper end of the control console (1), and a limiting device (4) for limiting the position of the package (3) is provided at the upper end of the conveying device (2), characterized in that: The packaging machine also includes a core removal mechanism (5), a film changing mechanism (6), and a control system (7). The core removal mechanism (5) is located at the front end of the upright plate (13) and can automatically remove empty core tubes (17) when the packaging film (18) is used up. The film changing mechanism (6) is located at the upper end of the upright frame (12) and is used to install new core tubes (17) with packaging film (18). The control system (7) is located at the front end of the upright plate (13) and can enable the core removal mechanism (5) and the film changing mechanism (6) to work together intelligently. The core removal mechanism (5) includes a mounting plate (51) fixedly installed on the outer side of the gear ring (16). A central column (52) is fixedly installed on the outer side of the mounting plate (51). A core cylinder (17) is sleeved on the outer side of the central column (52). A slot (171) is opened on the inner side of the core cylinder (17). The slot (171) is arranged in a ring shape. Two sets of rotating cylinders (53) are rotatably connected inside the central column (52). A pulley (531) is fixedly connected to the outer side of the rotating cylinder (53). The two sets of pulleys (531) are connected by a belt (54). The rotating cylinder (53) has an internal movable cavity (532). Two sets of limiting plates (55) are movably connected in the movable cavity (532). A locking post (551) is fixedly connected to the outer side of the limiting plate (55). The outer end of the locking post (551) is inserted into the locking groove (171). The locking groove (171) is opened on the inner wall of the core cylinder (17). A damping spring (552) is provided between the two sets of limiting plates (55). An inclined notch is opened at the outer end of the locking post (551). The movable cavity (532) and the limiting plate (55) are both polygonal. The membrane changing mechanism (6) includes a membrane box (61) fixedly installed on the upper end of the stand (12). The upper end of the membrane box (61) is provided with a feed inlet (611), and the side of the membrane box (61) near the stand plate (13) is provided with a discharge outlet (612). The control system (7) includes a position detection mark (71) fixedly installed on the outer side of the toothed ring (16), and two sets of symmetrical position detection sensors (72) are fixedly installed on the left side of the upright plate (13).

2. The stretch wrapping machine according to claim 1, characterized in that, A servo motor (14) is fixedly installed on the side of the upright plate (13). A gear (15) is fixedly connected to the output shaft of the servo motor (14). The gear (15) meshes with a gear ring (16). The gear ring (16) is rotatably connected to the upright plate (13).

3. The stretch wrapping machine according to claim 1, characterized in that, The central column (52) has an equipment cavity (521) inside, and a stepper motor (56) is fixedly installed inside the equipment cavity (521). The output shaft of the stepper motor (56) is fixedly connected to a bevel gear (561). The bevel gear (561) meshes with a bevel ring (57), and the bevel ring (57) is fixedly installed on a set of rotating drums (53).

4. A stretch wrapping machine according to claim 3, characterized in that, A first cylinder (58) is fixedly installed on the right side of the upright plate (13). The piston rod of the first cylinder (58) passes through the upright plate (13) and is fixedly connected to a push plate (59).

5. A stretch wrapping machine according to claim 1, characterized in that, A second cylinder (62) is fixedly installed below the support frame (12). The piston rod of the second cylinder (62) is inserted into the film box (61) and is fixedly connected to a push cylinder (63). The right side of the push cylinder (63) is directly opposite the core cylinder (17) and the packaging film (18).

6. A stretch wrapping machine according to claim 1, characterized in that, The position detection mark (71) and the position detection sensor (72) are respectively a reflector and a photoelectric reflective sensor, or a light shield and a photoelectric emission sensor, or a magnet and a Hall sensor.

Images