An automatic winding structure for stretch film

Abstract

This utility model discloses an automatic winding structure for stretch film, including a support frame, a roll assembly, a first transmission assembly, a second transmission assembly, a third transmission assembly, a synchronous belt drive assembly, an auxiliary film feeding cylinder, and a conveying and cutting mechanism, all sequentially arranged on the support frame. The support frame is equipped with a lifting and pressing mechanism for pressing the auxiliary film feeding cylinder during winding, a clamping and conveying mechanism for clamping the roll assembly to complete the winding process and conveying the roll assembly, and a telescopic clamping assembly for elastically clamping the end of the roll assembly in the axial direction to limit its axial displacement. The telescopic clamping assembly is located above the clamping and conveying mechanism. This utility model belongs to the field of stretch film winding technology, specifically referring to an automatic winding structure for stretch film.

Description

Technical Field

[0001] This utility model belongs to the field of stretch film winding technology, specifically referring to an automatic stretch film winding structure. Background Technology

[0002] In the field of stretch film production and packaging, automatic winding devices are core equipment for ensuring the quality of finished film and production efficiency. They must simultaneously meet the core requirements of "tight and secure film rolls, neat and even edges, and automated processes without manual intervention." However, existing automatic stretch film winding devices still suffer from three major technical challenges in practical applications, making them difficult to adapt to high-precision, high-efficiency production scenarios:

[0003] 1. Insufficient control over the tightness of the membrane roll can easily lead to damage or loosening.

[0004] In existing technologies, most winding devices use rigid clamping structures (such as fixed rollers or direct cylinder clamping) to clamp the film roll. If the clamping force is set too high, the thin wrapping film is easily damaged or stretched. If the clamping force is reduced to avoid damage, the clamping force will decrease rapidly as the roll diameter gradually increases during winding, resulting in gaps and looseness between film layers, which can easily lead to film layer detachment during subsequent storage or transportation. At the same time, some devices lack a precise guiding structure for the clamping rollers, which can easily cause uneven stress on the film roll during winding due to roller misalignment, ultimately causing wrinkles and misalignment at the edges of the film roll, significantly reducing the appearance and quality precision of the finished product.

[0005] 2. The lack of axial positioning on the drum significantly affects winding accuracy due to movement.

[0006] During the winding of the stretch film, the axial stability of the roll assembly directly determines the edge neatness of the film roll. In existing technologies, most devices only focus on the radial clamping and fixing of the roll, without a specific axial positioning structure. During motor-driven rotation, the roll is prone to axial movement due to processing errors, bearing clearances, or fluctuations in film tension, leading to misalignment between film layers. In severe cases, this can even result in "edge protrusion" or "localized layering," requiring manual trimming, which not only increases process costs but also wastes film material. The few devices that do incorporate axial positioning often use rigid clamping methods, which cannot absorb the minor impact forces from the roll's rotation. Long-term use can easily lead to wear at the roll end and deformation of the positioning components, shortening the equipment's lifespan. Utility Model Content

[0007] To address the aforementioned problems of insufficient control over the tightness of the film roll and lack of axial positioning of the roll, this utility model provides an automatic winding structure for the wound film.

[0008] To achieve the above functions, the technical solution adopted by this utility model is as follows: an automatic winding structure for stretch film, including a support frame, a roll assembly, a first transmission assembly, a second transmission assembly, a third transmission assembly, a synchronous belt drive assembly, an auxiliary film feeding cylinder fixedly installed on the support frame, and a film conveying and cutting mechanism driven by the synchronous belt drive assembly and rotating around the central axis of the auxiliary film feeding cylinder.

[0009] The support frame is equipped with a lifting and pressing mechanism for pressing the auxiliary film feeding tube during winding, a clamping and conveying mechanism for clamping the roll assembly to complete the winding work and conveying the roll assembly, and a telescopic clamping assembly for elastically clamping the end of the roll assembly in the axial direction to limit its axial displacement. The telescopic clamping assembly is located above the clamping and conveying mechanism.

[0010] Furthermore, the lifting and pressing mechanism includes a pressing roller parallel to the auxiliary film feeding cylinder, a support block symmetrically fixed to the top of the support frame, a fixing block fixed to the inner side wall of the support block, a reciprocating cylinder fixed to the top of the fixing block, a pull block, a T-shaped slide groove opened on the support frame, a round rod fixed to one side of the pull block, a torsion spring sleeved on the round rod, and a connecting rod rotatably connected to the round rod.

[0011] The piston rod of the reciprocating cylinder moves through the fixed block and is connected to the top of the pull block;

[0012] The end of the connecting rod away from the round rod is fixedly connected to the pressure roller;

[0013] One end of the torsion spring is fixed to the pull block, and the other end is fixed to the connecting rod.

[0014] Furthermore, a T-shaped slider that is slidably adapted to the T-shaped groove is fixed on the other side of the pull block.

[0015] Furthermore, the clamping and conveying mechanism includes inclined auxiliary plates symmetrically fixed to the inner wall of the support frame, through slots opened on both sides of the support frame, blocks symmetrically fixed to the outer wall of the support frame, transmission cylinders fixed on the blocks, a first transmission block connected to the transmission cylinder piston rod that moves through the blocks, a second transmission block fixed to the first transmission block, a first clamping block fixed to the second transmission block, a hinge seat fixed to the second transmission block, a spring fixed inside the hinge seat, and a second clamping block hinged to the hinge seat.

[0016] There is a certain gap between the auxiliary plate and the support frame;

[0017] The through slot is set parallel to the auxiliary plate;

[0018] The clamping surface of the first clamping block is arc-shaped.

[0019] Furthermore, the second transmission block is provided with a through slot for movement;

[0020] The side wall of the second clamping block is fixedly connected to the spring;

[0021] The clamping surface of the second clamping block is arc-shaped, and under the action of the spring, it cooperates with the first clamping block to form an adaptive clamping opening.

[0022] Furthermore, the telescopic clamping assembly includes a circular groove formed in the inner wall of the support frame, a telescopic clamping cylinder fixed to the outer wall of the support frame, a circular support disposed in the circular groove, and a circular recess formed in the circular support.

[0023] The piston rod of the telescopic clamping cylinder moves through the side of the support frame and is placed in a circular groove, and is fixedly connected to the circular support.

[0024] Furthermore, an elastic gasket is fixedly provided inside the circular groove.

[0025] Compared with the prior art, the present invention achieves the following beneficial effects by adopting the above structure:

[0026] 1. By setting up a lifting and pressing mechanism, compared with the problems of "rigid pressing easily damaging the film material or the pressing force decreasing as the roll diameter increases" in the prior art, this utility model uses a reciprocating cylinder drive and a torsion spring adaptive cooperation to ensure that the pressing roller is always in close contact with the film roll surface. This ensures that there are no gaps between layers and the film roll is uniformly compacted during the winding process, and the elastic buffer of the torsion spring can prevent excessive pressure from damaging the film material. At the same time, the guiding structure of the T-shaped slider and T-shaped groove can prevent the pressing roller from shifting and causing uneven force on the film roll. This solves the problem of wrinkles and misalignment at the edge of the film roll in the prior art, and significantly improves the appearance and quality accuracy of the finished winding product.

[0027] 2. The existing technology, which mostly lacks a telescopic clamping component, utilizes a combination of lifting and pressing mechanism and telescopic clamping assembly. This makes the roll assembly prone to axial movement during winding, affecting winding accuracy. In this invention, the telescopic clamping assembly engages with the protrusion at the end of the roll via a circular groove, and works in conjunction with an elastic gasket to absorb axial movement during roll rotation, thus limiting roll displacement axially. Furthermore, compared to existing rigid positioning structures, the elastic gasket design can absorb the minor impact force of roll rotation, reducing component wear and extending equipment lifespan. It also prevents edge damage to the film roll due to rigid collisions, forming a dual guarantee of radial pressing and axial positioning with the lifting and pressing mechanism, further improving the stability of winding quality. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the automatic winding structure for stretch film proposed in this utility model. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the overall structure of the automatic winding structure for stretch film proposed in this utility model. Figure 2 ;

[0030] Figure 3 Cross-sectional view of an automatic winding structure for stretch film proposed in this utility model. Figure 1 ;

[0031] Figure 4 Cross-sectional view of an automatic winding structure for stretch film proposed in this utility model. Figure 2 ;

[0032] Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle;

[0033] Figure 6 This is a schematic diagram of the overall structure of the lifting and pressing mechanism and the telescopic clamping assembly proposed in this utility model.

[0034] Figure 7 The present utility model proposes Figure 6 A sectional view.

[0035] Among them, 1. Support frame, 11. First transmission assembly, 12. Second transmission assembly, 13. Third transmission assembly, 14. Synchronous belt drive assembly, 15. Conveying and cutting film mechanism, 2. Roll assembly, 3. Auxiliary film feeding roll, 4. Lifting and pressing mechanism, 41. Pressing roller, 42. Support block, 43. Fixing block, 44. Reciprocating cylinder, 45. Pulling block, 451. T-shaped slider, 46. T-shaped slide groove, 47. Round rod, 48. Connecting rod, 49. Torsion spring, 5. Clamping and conveying mechanism, 51. Auxiliary plate, 52. Through groove, 53. Square block, 54. Transmission cylinder, 55. First transmission block, 56. Second transmission block, 57. First clamping block, 58. Hinge seat, 581. Spring, 59. Second clamping block, 6. Telescopic clamping assembly, 61. Round groove, 62. Telescopic clamping cylinder, 63. Round support, 64. Elastic pad. Detailed Implementation

[0036] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-7 As shown, this utility model provides an automatic winding structure for stretch film, including a support frame 1, a roll assembly 2, a first transmission assembly 11, a second transmission assembly 12, a third transmission assembly 13, a synchronous belt drive assembly 14, an auxiliary film feeding cylinder 3 fixedly installed on the support frame 1, and a conveying and cutting mechanism 15 driven by the synchronous belt drive assembly 14 and rotating around the central axis of the auxiliary film feeding cylinder 3. The support frame 1 provides overall structural support. The roll assembly 2 serves as the core carrier for winding the stretch film. The roll assembly 2 includes a central support roller, multiple sets of rolls sleeved on the support roller, and a rotary motor located in the middle of the support roller. During winding, the rotary motor drives the support roller to drive the rolls to rotate synchronously. Component 2 consists of a support roller and multiple sets of rolls tightly fitted on the support roller. Through the cooperation of the first transmission component 11, the second transmission component 12 and the third transmission component 13, the roll assembly 2 is conveyed to the groove on the conveying and cutting mechanism 15. The synchronous belt drive component 14 can stably output power and drive the conveying and cutting mechanism 15 to rotate around the auxiliary film feeding cylinder 3 for one revolution, so that the roll assembly 2 is transferred from the groove on the cutting mechanism to the adaptive clamping mouth of the first clamping block 57 and the second clamping block 59. The auxiliary film feeding cylinder 3 plays a guiding and supporting role for the winding film, ensuring the stability of the film material conveying path. When the conveying and cutting mechanism 15 rotates around the central axis of the auxiliary film feeding cylinder 3, it can simultaneously complete the conveying and positioning of the roll assembly 2 and the cutting of the film material after winding.

[0040] The support frame 1 is equipped with a lifting and pressing mechanism 4 for pressing the auxiliary film feeding tube 3 during winding, a clamping and conveying mechanism 5 for clamping the roll assembly 2 to complete the winding and conveying the roll assembly 2, and a telescopic clamping assembly 6 for elastically clamping the end of the roll assembly 2 in the axial direction to limit its axial displacement. The telescopic clamping assembly 6 is located above the clamping and conveying mechanism 5. The lifting and pressing mechanism 4 can be adjusted up and down during the winding process and always keeps in contact with the surface of the film roll passing through the auxiliary film feeding tube 3, preventing gaps between film roll layers through pressure. The clamping and conveying mechanism 5 can stably clamp the roll assembly 2 to ensure that the roll assembly 2 maintains a fixed posture when rotating and winding, and can also drive the wound roll assembly. Part 2 moves along the auxiliary plate 51 until it engages with the groove of the second transmission component 12 at the edge, completing the unloading process. The telescopic clamping component 6 provides axial elastic clamping from the end of the roll assembly 2, limiting the axial displacement of the roll assembly 2 through elastic force to prevent the roll assembly 2 from shifting during winding. The three components work together to form a winding system that provides radial pressing, axial positioning, and automatic transfer. The lifting and pressing mechanism 4 ensures the tightness of the film roll winding and prevents loosening. The clamping and conveying mechanism 5 automates the clamping, fixing, stable winding, and transfer of the roll assembly 2, reducing manual intervention. The telescopic clamping component 6 improves the positioning accuracy of the roll assembly 2, preventing uneven edges of the film roll due to axial shifting, and improving the overall winding quality and automation level.

[0041] like Figure 1-5 As shown, the lifting and pressing mechanism 4 includes a pressing roller 41 parallel to the auxiliary film feeding cylinder 3, a support block 42 symmetrically fixed to the top of the support frame 1, a fixing block 43 fixed to the inner wall of the support block 42, a reciprocating cylinder 44 fixed to the top of the fixing block 43, a pull block 45, a T-shaped slide groove opened on the support frame 1, a round rod 47 fixed to one side of the pull block 45, a torsion spring 49 sleeved on the round rod 47, and a connecting rod 48 rotatably connected to the round rod 47; the piston rod of the reciprocating cylinder 44 moves through the fixing block 43 and is connected to the top of the pull block 45; the end of the connecting rod 48 away from the round rod 47 is fixedly connected to the pressing roller 41; one end of the torsion spring 49 is fixed to the pull block 45, and the other end is fixed to the connecting rod 48; a T-shaped slider 451 slidably adapted to the T-shaped slide groove 46 is fixed to the other side of the pull block 45, and the T-shaped slider 451 and the pull block 45 are connected to the T-shaped slide groove 46. The T-shaped slide groove 46 slides and adapts to guide and restrict the movement direction of the pull block 45, ensuring that the pull block 45 moves only in the vertical direction. After the reciprocating cylinder 44 is started, its piston rod extends and drives the pull block 45 to move downward, which in turn drives the pressure roller 41 to move downward synchronously. Under the elastic action of the torsion spring 49, the roller surface of the pressure roller 41 can adaptively and tightly fit the auxiliary film feeding cylinder 3, and adjust the clamping force in real time for the winding film passing between the pressure roller 41 and the auxiliary film feeding cylinder 3, which not only ensures that the film roll is tightly wound, but also avoids damage to the film material due to excessive pressure.

[0042] like Figure 1-4As shown in Figures 6 and 7, the clamping and conveying mechanism 5 includes inclined auxiliary plates 51 symmetrically fixed to the inner wall of the support frame 1, through slots 52 extending through both sides of the support frame 1, square blocks 53 symmetrically fixed to the outer wall of the support frame 1, transmission cylinders 54 fixed on the square blocks 53, a first transmission block 55 connected to the piston rod of the transmission cylinders 54 extending through the square blocks 53, a second transmission block 56 fixed to the first transmission block 55, a first clamping block 57 fixed to the second transmission block 56, a hinge seat 58 fixed to the second transmission block 56, and a spring 581 fixed inside the hinge seat 58. The second clamping block 59 is hinged to the hinge seat 58; the auxiliary plate 51 has a certain gap with the support frame 1; the through slot 52 is arranged parallel to the auxiliary plate 51; the clamping surface of the first clamping block 57 is arc-shaped; the second transmission block 56 moves through the through slot 52; the side wall of the second clamping block 59 is fixedly connected to the spring 581; the clamping surface of the second clamping block 59 is arc-shaped, and under the action of the spring 581, it cooperates with the first clamping block 57 to form an adaptive clamping opening; the auxiliary plate 51 is used to support the end of the drum assembly 2 to prevent it from falling through the bottom gap between the first clamping block 57 and the second clamping block 59;

[0043] After the roll assembly 2, clamped between the first clamping block 57 and the second clamping block 59, is wound up, the conveying and cutting mechanism 15 rotates to cut the film material. The transmission cylinder 54 extends, driving the roll assembly 2 to move along the through groove 52 and the auxiliary plate 51 via the first transmission block 55 and the second transmission block 56, until the first clamping block 57 and the second clamping block 59 move the roll assembly 2 to the edge of the auxiliary plate 51. The roll assembly 2 falls from the bottom gap between the first clamping block 57 and the second clamping block 59 into the groove of the second transmission assembly 12, completing the next step of collecting the roll. Then, the transmission cylinder 54 retracts, and the first clamping block 57 and the second clamping block 59 return to their original positions. Then, the conveying and cutting mechanism 15 continues to rotate, carrying the film material to be collected from the groove. The roll assembly 2 is re-transferred and engaged within the adaptive clamping openings of the first clamping block 57 and the second clamping block 59. During engagement, the second clamping block 59 rotates around the hinge seat 58 under the pressure of the roll assembly 2, and the spring 581 is compressed. When the end of the roll assembly 2 is stably delivered to the arc-shaped clamping surface of the first clamping block 57, the restoring force of the spring 581 drives the second clamping block 59 to reset, cooperating with the first clamping block 57 to initially position the end of the roll assembly 2; and cooperating with the telescopic clamping assembly 6 to stably position the roll assembly 2. When the roll assembly 2 is performing winding operations, the rotary motor rotates, driving the roll sleeved on the support roller to rotate and wind up. The two ends of the roll assembly 2 are used to complete the overall transmission and fixing of the support roller.

[0044] like Figure 1 , 2As shown in Figures 4, 6, and 7, the telescopic clamping assembly 6 includes a circular groove 61 formed in the inner wall of the support frame 1, a telescopic clamping cylinder 62 fixed to the outer wall of the support frame 1, a circular support 63 disposed in the circular groove 61, and a circular groove formed in the circular support 63, for engaging with the protrusion at the end of the drum assembly 2 to achieve axial positioning, prevent its movement, and improve winding precision; the piston rod of the telescopic clamping cylinder 62 moves through the side of the support frame 1 and is placed in the circular groove 61, and is fixedly connected to the circular support 63. After the end of the drum assembly 2 is initially positioned in the first clamping block 57 and the second clamping block 59, the telescopic clamping cylinder 62 is activated. 2. Its piston rod extends, driving the circular groove of the circular support 63 to engage with the end of the roll assembly 2, effectively preventing the axial movement of the roll assembly 2, significantly improving the precision of the winding of the film, and avoiding uneven edges of the film roll; the circular groove 61 guides and ensures the accurate movement trajectory of the circular support 63; an elastic pad 64 is fixedly provided inside the circular groove to absorb the axial movement when the roll rotates. The elastic pad 64 is deformed by the pressure of the protrusion at the end of the roll assembly 2, and absorbs the impact force generated by the axial movement when the roll assembly 2 rotates through deformation. At the same time, its reverse elastic force can further limit the axial displacement of the roll assembly 2 and limit it to a preset position.

[0045] In practical use, 1. Roll feeding and preliminary positioning: After starting the equipment, with the cooperation of the first transmission component 11, the second transmission component 12 and the third transmission component 13, the roll assembly 2 to be wound is conveyed to the groove of the conveying film cutting mechanism 15; the synchronous belt drive component 14 drives the conveying film cutting mechanism 15 to rotate around the auxiliary film feeding cylinder 3, and transfers the roll assembly 2 between the first clamping block 57 and the second clamping block 59 of the clamping conveying mechanism 5. At this time, the second clamping block 59 is squeezed by the roll assembly 2 and rotates around the hinge seat 58 and is compressed by the spring 581. After the end of the roll assembly 2 is attached to the arc surface of the first clamping block 57, the spring 581 resets and drives the second clamping block 59 to clamp, completing the preliminary positioning of the roll assembly 2.

[0046] 2. Axial positioning and winding start: The telescopic clamping cylinder 62 is activated, and its piston rod pushes the circular support 63 to move along the circular groove 61, so that the circular groove on the end face of the circular support 63 engages with the protrusion at the end of the roll assembly 2. The subsequent rotational movement is absorbed by the elastic gasket 64. At the same time, the reciprocating cylinder 44 of the lifting and pressing mechanism 4 is activated, and the piston rod drives the pull block 45 to move down along the T-shaped slide 46, which drives the pressing roller 41 to fit the film material at the auxiliary film feeding cylinder 3. The torsion spring 49 adaptively adjusts the pressing force. The wrapping film is transported from the outside to the equipment. It is first pressed by the pressing roller 41 and the auxiliary film feeding cylinder 3, and then guided by the auxiliary film feeding cylinder 3 to the conveying and cutting mechanism 15. Finally, it is wound onto multiple rolls of the roll assembly 2. Then, the rotary motor in the center of the roll assembly 2 is activated, and the roll begins to rotate and wind. The pressing roller 41 adjusts the angle and pressure in real time with the increase of the film roll diameter through the torsion spring 49 to ensure that the film roll is tight.

[0047] 3. Film cutting and finished product transfer: After winding is completed, the film cutting mechanism 15 rotates and cuts the film material; the transmission cylinder 54 extends, and through the first transmission block 55 and the second transmission block 56, it drives the roll assembly 2 to move along the through groove 52 and the auxiliary plate 51 to the edge of the auxiliary plate 51. The roll assembly 2 falls from the bottom gap of the clamping block into the groove of the second transmission assembly 12, completing the finished product collection; then the transmission cylinder 54 retracts, the clamping block resets, and the film cutting mechanism 15 continues to rotate, conveying the new roll assembly 2 to be wound into the clamping block, entering the next winding cycle.

[0048] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An automatic winding structure for stretch film, comprising a support frame (1), a roll assembly (2), a first transmission assembly (11), a second transmission assembly (12), a third transmission assembly (13), a synchronous belt drive assembly (14), an auxiliary film feeding roll (3), and a film conveying and cutting mechanism (15) sequentially arranged on the support frame (1), characterized in that: The support frame (1) is provided with a lifting and pressing mechanism (4) for pressing the auxiliary film feeding cylinder (3) during winding, a clamping and conveying mechanism (5) for clamping the roll assembly (2) to complete the winding work and conveying the roll assembly (2), and a telescopic clamping assembly (6) for elastically clamping the end of the roll assembly (2) in the axial direction to limit its axial displacement. The telescopic clamping assembly (6) is located above the clamping and conveying mechanism (5).

2. The automatic winding structure for stretch film according to claim 1, characterized in that: The lifting and pressing mechanism (4) includes a pressing roller (41) parallel to the auxiliary film feeding cylinder (3), a support block (42) symmetrically fixed to the top of the support frame (1), a fixing block (43) fixed to the inner side wall of the support block (42), a reciprocating cylinder (44) fixed to the top of the fixing block (43), a pull block (45), a T-shaped slide groove (46) opened on the support frame (1), a round rod (47) fixed to one side of the pull block (45), a torsion spring (49) sleeved on the round rod (47), and a connecting rod (48) rotatably connected to the round rod (47). The piston rod of the reciprocating cylinder (44) moves through the fixed block (43) and is connected to the top of the pull block (45); The end of the connecting rod (48) away from the round rod (47) is fixedly connected to the pressure roller (41); One end of the torsion spring (49) is fixed to the pull block (45), and the other end is fixed to the connecting rod (48).

3. The automatic winding structure for stretch film according to claim 2, characterized in that: The other side of the pull block (45) is fixed with a T-shaped slider (451) that is slidably adapted to the T-shaped groove (46).

4. The automatic winding structure for stretch film according to claim 1, characterized in that: The clamping and conveying mechanism (5) includes an inclined auxiliary plate (51) symmetrically fixed on the inner wall of the support frame (1), a through slot (52) through the two sides of the support frame (1), a block (53) symmetrically fixed on the outer wall of the support frame (1), a transmission cylinder (54) fixed on the block (53), a first transmission block (55) connected to the piston rod of the transmission cylinder (54) that moves through the block, a second transmission block (56) fixed to the first transmission block (55), a first clamping block (57) fixed on the second transmission block (56), a hinge seat (58) fixed on the second transmission block (56), a spring (581) fixed inside the hinge seat (58), and a second clamping block (59) hinged to the hinge seat (58). The through slot (52) is set parallel to the auxiliary plate (51); The clamping surface of the first clamping block (57) is arc-shaped.

5. The automatic winding structure for stretch film according to claim 4, characterized in that: The second transmission block (56) is moved through the through slot (52); The side wall of the second clamping block (59) is fixedly connected to the spring (581); The clamping surface of the second clamping block (59) is arc-shaped, and under the action of the spring (581), it cooperates with the first clamping block (57) to form an adaptive clamping opening.

6. The automatic winding structure for stretch film according to claim 1, characterized in that: The telescopic clamping assembly (6) includes a circular groove (61) opened on the inner wall of the support frame (1), a telescopic clamping cylinder (62) fixed on the outer wall of the support frame (1), a circular support (63) provided in the circular groove (61), and a circular recess opened in the circular support (63). The piston rod of the telescopic clamping cylinder (62) moves through the side of the support frame (1) and is placed in the circular groove, and is fixedly connected to the circular support (63).

7. The automatic winding structure for a stretch film according to claim 6, characterized in that: An elastic gasket (64) is fixed inside the circular groove.

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