A slitting device for producing a wrapping film

Abstract

The utility model discloses a kind of slitting devices for wrapping film production, it is related to the production technical field of wrapping film, including support frame, support frame is fixed with mounting bracket, winding roller is rotatably arranged in mounting bracket inside, mounting rod is installed in mounting bracket outside, cutter is fixed with mounting rod outer wall, cutter is provided with multiple groups, fixed frame is fixed with mounting bracket outer wall, mounting seat is equipped in fixed frame top, mounting bracket is provided with multiple groups and is rotatably arranged with winding roller inside, plug rod is inserted with mounting seat inside, fixed sleeve is inserted with plug rod top, control sleeve is rotatably arranged with fixed sleeve top, clamping block is fixed with control sleeve inside, clamping block is provided with multiple groups, plug rod outer wall is fixed with clamping plate, the quick plug-in locking mechanism of plug rod and fixed sleeve and control sleeve cooperation is used in this device, and the installation of winding roller can be completed by operator without using spanner screwdriver and any tool.

Description

Technical Field

[0001] This utility model relates to the field of stretch film production technology, and more specifically, it relates to a slitting device for stretch film production. Background Technology

[0002] During the roll replacement and loading process in stretch film production, the winding rollers wrapped with film need to be installed onto the slitting equipment for subsequent processing. Existing devices generally use bolt fastening or pin insertion for fixing. Operators need to use tools such as wrenches to tighten the bolts or tap the pins one by one to complete the installation. The loading and unloading process of a single winding roller usually takes several minutes or even longer. When the production line needs to frequently change rolls of different specifications or batches, the long loading and unloading operations cause equipment downtime and waiting, which seriously affects the continuity of production and overall efficiency. Especially in a production environment where multiple workstations are operating simultaneously, the cumulative waste of loading and unloading time is even more significant. At the same time, tool operation increases labor intensity and poses safety hazards such as tools being lost or bolts being loose. The lack of a fast and convenient tool-free loading and unloading mechanism restricts the improvement of production efficiency. Utility Model Content

[0003] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a slitting device for the production of stretch film to solve the technical problems mentioned in the background art.

[0004] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a slitting device for producing stretch film, comprising a support frame, a mounting frame fixedly mounted on the support frame, a winding roller rotatably mounted inside the mounting frame, a mounting rod mounted on the outside of the mounting frame, a cutter fixedly mounted on the outer wall of the mounting rod, multiple sets of cutters, a fixing frame fixedly mounted on the outer wall of the mounting frame, a mounting seat at the top of the fixing frame, multiple sets of mounting frames with winding rollers rotatably mounted inside, an insert rod inserted into the fixing frame and the mounting seat, a fixing sleeve inserted into the top of the insert rod, a control sleeve rotatably mounted on the top of the fixing sleeve, a locking block fixedly mounted inside the control sleeve, multiple sets of locking blocks, a locking plate fixedly mounted on the outer wall of the insert rod, multiple sets of locking plates inserted into multiple sets of locking blocks, a limiting groove formed on the outer wall of the insert rod, and a limiting block fixedly mounted inside the fixing sleeve, multiple sets of both the limiting groove and the limiting block.

[0005] The present invention is further configured such that the top of the fixing frame is provided with an insertion hole, and the insertion hole is provided in multiple sets and is respectively inserted into multiple sets of insertion rods, so as to realize the quick and accurate positioning and guiding insertion of the insertion rods and reduce the assembly difficulty.

[0006] The present invention is further configured such that a positioning block is slidably provided on the outer wall of the control sleeve, and multiple sets of positioning blocks are provided, each with a return spring connected to its top end. The multiple sets of return springs are connected to the outer wall of the control sleeve. A positioning groove is provided on the outer wall of the fixed sleeve, and multiple sets of positioning grooves are provided, each abutting against multiple sets of positioning blocks. The axial positioning and anti-reverse locking of the control sleeve after it has rotated to the correct position are achieved by the positioning blocks automatically springing into the positioning grooves under the action of the return springs.

[0007] The present invention is further configured such that a limiting sleeve is slidably provided on the outer wall of the fixed sleeve, the limiting sleeve abuts against the top of multiple sets of positioning blocks, a sliding rod is fixedly provided on the bottom surface of the limiting sleeve, multiple sets of sliding rods are provided, and a limiting block is fixedly provided at the bottom end of each sliding rod, a rotating sleeve is rotatably provided on the outer wall of the fixed sleeve, a limiting hole is provided on the outer wall of the rotating sleeve, multiple sets of limiting holes are provided, and an unlocking hole is provided at one end of each limiting hole, and multiple sets of compression springs are provided on the bottom surface of the limiting sleeve. The limiting sleeve and the rotating sleeve cooperate to construct a step-by-step unlocking mechanism, and under the action of the compression springs and the limiting blocks, multiple locking protections are formed to prevent accidental disassembly.

[0008] The present invention is further configured such that: a mounting ring is fixedly provided on the bottom surface of the rotating sleeve; an arc-shaped block is fixedly provided on the bottom surface of the mounting ring; multiple sets of arc-shaped blocks are provided, and abutment blocks are slidably provided on both sides; a push spring is provided between each set of abutment blocks and the arc-shaped block; an annular sleeve is fixedly provided on the outer wall of the fixed sleeve; abutment holes are provided on both sides of the annular sleeve; multiple sets of abutment holes are provided, and each abuts against multiple sets of abutment blocks; by the abutment blocks being inserted into the abutment holes under the pushing force of the push spring, frictional resistance is applied to the rotating sleeve to achieve anti-loosening locking; and when unlocking, the arc-shaped block pushes the abutment blocks away from the abutment holes.

[0009] The present invention is further configured such that a screw is threadedly connected to the top of the mounting bracket, and the screw is provided with multiple sets, each of which is rotatably connected to a slider at its bottom. An adjusting roller is rotatably connected to the inner side of the multiple sets of sliders. By rotating the screw, the sliders and adjusting rollers are moved up and down to adjust the length of the film running path and achieve tension control.

[0010] The present invention is further configured such that a limiting roller is rotatably connected to the inner side of the mounting frame, and the limiting roller abuts against the outer wall of the membrane material to provide support and guidance to ensure smooth conveying and prevent deviation.

[0011] The present invention is further configured such that a connecting rod is rotatably connected to the inner side of the support frame, a driving component is connected between the connecting rod and the support frame, and a transmission component is connected between the connecting rod and the take-up roller. The driving component drives the connecting rod to rotate and the transmission component transmits the power to the take-up roller to achieve film winding.

[0012] (III) Beneficial Effects Compared with the prior art, the present invention provides a slitting device for the production of stretch film, which has the following advantages: 1. This device adopts a quick-connect locking mechanism that uses a plug rod in conjunction with a fixed sleeve and a control sleeve. Operators can complete the installation of the winding roller without using any tools such as wrenches or screwdrivers. After the mounting base is placed against the top surface of the fixing frame, the plug rod automatically inserts into the plug hole and the fixed sleeve. The precise guidance of the limiting block and the limiting groove ensures that the plug is in place. Then, simply rotating the control sleeve will drive multiple sets of locking blocks and plates to quickly engage and complete the main locking. The operation process completely eliminates the need for tools, avoiding waiting time caused by lost or inconvenient tools. At the same time, it reduces the labor intensity of operators. A single person can easily complete the winding roller loading and unloading operation that originally required multiple people to cooperate, significantly improving the efficiency of on-site operations and the flexibility of manpower allocation.

[0013] 2. This device forms a first layer of mechanical locking by interlocking multiple sets of locking blocks with the locking plate in a circumferentially distributed manner. The rotation of the control sleeve drives the locking blocks to deeply engage with the locking plate, providing strong anti-pull-out capability. The positioning block automatically pops out under the action of the return spring and inserts into the positioning groove to form a second layer of axial limiting, preventing the locking block from disengaging due to accidental reverse rotation of the control sleeve. The limiting sleeve presses the top of the positioning block under the thrust of the compression spring, forming a third layer of locking protection. The limiting block abuts against the top surface of the rotating sleeve, supporting the limiting sleeve and preventing it from moving upward, forming a fourth layer of physical barrier. The abutting block is embedded in the abutting hole under the action of the push spring, applying frictional resistance to the rotating sleeve, forming a fifth layer of anti-loosening mechanism. The five independent and interconnected locking structures work together to ensure that the winding roller always maintains a stable connection under high-speed operation and high tension conditions. The multi-level locking process is accompanied by obvious mechanical biting tactile and audible feedback, allowing operators to clearly perceive the completion status of each locking step and avoid the risk of misoperation due to incomplete locking.

[0014] 3. The step-by-step unlocking mechanism designed in this device requires operators to perform the disassembly operation in a fixed sequence: first, rotate the rotating sleeve to release the restraint of the abutment block; then, push the limit sleeve to release the constraint of the positioning block; and finally, rotate the control sleeve to separate the locking block and plate. Each unlocking step depends on the completion of the preceding step. If the rotating sleeve is not rotated to the unlocking position, the unlocking hole and the limit block are misaligned and the limit sleeve cannot be pushed. If the limit sleeve is not moved upward, the positioning block remains in the positioning groove to prevent the control sleeve from rotating. If the control sleeve is not rotated and separated, the locking block and plate are in an engaged state, preventing the insertion rod from being pulled out. The multi-level interlocking protection completely eliminates the possibility of operators skipping key steps and forcibly disassembling the device from the mechanical structure level, effectively preventing personal injury caused by sudden tension release or accidental detachment of the winding roller due to incorrect operation sequence or omission of steps. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a slitting device for producing stretch film according to the present invention; Figure 2 This is a schematic diagram of the structure of the adjusting roller and the transmission assembly in this utility model; Figure 3 This is a schematic diagram of the disassembly structure of the mounting base in this utility model; Figure 4 This is a schematic diagram of the locking state of the insertion rod in this utility model; Figure 5 This is a cross-sectional view of the control sleeve and the limiting sleeve in this utility model; Figure 6 This is a cross-sectional view of the rotating sleeve and mounting ring in this utility model.

[0016] In the diagram: 1. Support frame; 2. Mounting frame; 3. Take-up roller; 4. Mounting rod; 5. Cutter; 6. Fixing frame; 7. Mounting base; 8. Winding roller; 9. Insert rod; 10. Fixing sleeve; 11. Control sleeve; 12. Locking block; 13. Locking plate; 14. Limiting groove; 15. Limiting block; 16. Insertion hole; 17. Positioning block; 18. Return spring; 19. Positioning groove; 20. Limiting sleeve; 21. Slide rod; 22. Limiting block; 23. Rotating sleeve; 24. Limiting hole; 25. Unlocking hole; 250. Compression spring; 26. Mounting ring; 27. Arc-shaped block; 28. Abutment block; 29. ​​Push spring; 30. Annular sleeve; 31. Abutment hole; 32. Screw; 33. Slider; 34. Adjusting roller; 35. Limiting roller; 350. Linking rod; 36. Drive assembly; 37. Transmission assembly. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0020] Please see Figures 1-6A slitting device for producing stretch film includes a support frame 1, a mounting frame 2 fixedly mounted on the support frame 1, a take-up roller 3 rotatably mounted inside the mounting frame 2, a mounting rod 4 mounted on the outside of the mounting frame 2, a cutter 5 fixedly mounted on the outer wall of the mounting rod 4, and multiple sets of cutters 5. A fixing frame 6 is fixedly mounted on the outer wall of the mounting frame 2, a mounting seat 7 is provided at the top of the fixing frame 6, multiple sets of the mounting frame 2 have a winding roller 8 rotatably mounted inside, an insert rod 9 is inserted into the fixing frame 6 and the mounting seat 7, a fixing sleeve 10 is inserted into the top of the insert rod 9, a control sleeve 11 is rotatably mounted at the top of the fixing sleeve 10, a locking block 12 is fixedly mounted inside the control sleeve 11, and multiple sets of locking blocks 12 are provided. A locking plate 13 is fixedly mounted on the outer wall of the insert rod 9, and multiple sets of locking plates 13 are inserted into multiple sets of locking blocks 12. A limiting groove 14 is opened on the outer wall of the insert rod 9, and a limiting block 15 is fixedly mounted inside the fixing sleeve 10. Multiple sets of limiting grooves 14 and limiting blocks 15 are provided.

[0021] The top of the fixed frame 6 is provided with a socket 16, and the socket 16 is provided in multiple sets and is respectively connected to multiple sets of plug rods 9.

[0022] The mounting bracket 2 is threadedly connected to a screw 32 at its top. Multiple screws 32 are provided, and each screw 32 is rotatably connected to a slider 33 at its bottom. Adjusting rollers 34 are rotatably connected to the inner side of the multiple sliders 33.

[0023] The mounting bracket 2 is provided with a limit roller 35 for rotatable connection on the inner side.

[0024] A connecting rod 350 is rotatably connected to the inner side of the support frame 1. A drive assembly 36 is connected between the connecting rod and the support frame 1. A transmission assembly 37 is connected between the connecting rod and the take-up roller 3.

[0025] In this embodiment, during use, the mounting base 7 connected to both ends of the winding roller 8 abuts against the top surface of the fixing frame 6, the insert rod 9 is inserted into the insertion hole 16 and connected to the mounting base 7, the insert rod 9 is inserted into the fixing sleeve 10 and the control sleeve 11, and the multiple sets of limiting blocks 15 are positioned and inserted into the limiting groove 14. The control sleeve 11 is rotated to make the multiple sets of locking blocks 12 and locking plates 13 insert into each other, the rotating sleeve 23 is rotated to make the multiple sets of sliding rods 21 slide out of the limiting hole 24 and into the unlocking hole 25, the multiple sets of compression springs 250 push the limiting sleeve 20 abut against the top of the multiple sets of positioning blocks 17, so that the multiple sets of positioning blocks 17 abut against the positioning groove 19 to position the control sleeve 11, and then the rotating sleeve 23 is rotated to make the multiple sets of limiting blocks 15 abut against the top of the positioning blocks 17. Position block 22 abuts against the top of rotating sleeve 23 to restrict limiting sleeve 20. Multiple sets of push springs 29 push abutting block 28 to abut in abutting hole 31 to restrict rotating sleeve 23, thus fixing mounting base 7. The top of the wrapping film wound on winding roller 8 is connected to the outer wall of take-up roller 3. The drive assembly 36 drives the linkage rod 350 to rotate. The linkage rod 350 drives the take-up roller 3 to transmit the wrapping film through transmission assembly 37. Limiting roller 35 abuts against the outer wall of wrapping film to ensure smooth transmission. Multiple sets of cutters 5 cut the wrapping film. Rotary thread is threaded to mounting bracket 2 to drive slider 33 to slide, thereby adjusting the tension of wrapping film through adjusting roller 34.

[0026] Please see Figures 3-6 As a further implementation of the overall equipment: the outer wall of the control sleeve 11 is provided with a positioning block 17, the positioning block 17 is provided in multiple sets and the top of each is connected with a reset spring 18, the multiple sets of reset springs 18 are connected to the outer wall of the control sleeve 11, the outer wall of the fixed sleeve 10 is provided with a positioning groove 19, the positioning groove 19 is provided in multiple sets and abuts against the multiple sets of positioning blocks 17 respectively. A limiting sleeve 20 is slidably provided on the outer wall of the fixed sleeve 10. The limiting sleeve 20 abuts against the top of multiple sets of positioning blocks 17. A sliding rod 21 is fixedly provided on the bottom surface of the limiting sleeve 20. Multiple sets of sliding rods 21 are provided, and each of them is fixedly provided with a limiting block 22 at its bottom end. A rotating sleeve 23 is rotatably provided on the outer wall of the fixed sleeve 10. A limiting hole 24 is opened on the outer wall of the rotating sleeve 23. Multiple sets of limiting holes 24 are provided, and each of them is provided with an unlocking hole 25 at one end. Multiple compression springs 250 are provided on the bottom surface of the limiting sleeve 20.

[0027] A mounting ring 26 is fixedly provided on the bottom surface of the rotating sleeve 23. An arc-shaped block 27 is fixedly provided on the bottom surface of the mounting ring 26. Multiple sets of arc-shaped blocks 27 are provided, and abutment blocks 28 are slidably provided on both sides. Push springs 29 are connected between the multiple sets of abutment blocks 28 and the arc-shaped blocks 27. An annular sleeve 30 is fixedly provided on the outer wall of the fixed sleeve 10. Abutment holes 31 are provided on both sides of the annular sleeve 30. Multiple sets of abutment holes 31 are provided and abut against the multiple sets of abutment blocks 28 respectively.

[0028] More specifically, when the winding roller 8 needs to be disassembled, rotating the rotating sleeve 23 causes multiple sets of arc-shaped blocks 27 to slide, pushing the abutment blocks 28 through multiple sets of abutment holes 31 to compress the push spring 29, and causing multiple sets of abutment blocks 28 to slide along the inner wall of the annular sleeve 30. The rotating sleeve 23 causes multiple sets of unlocking holes 25 to rotate to the bottom surface of the limiting block 22, releasing the restriction on the limiting sleeve 20, and pushing the limiting sleeve 20 so that multiple sets of sliding rods 21 are inserted into the unlocking holes 25 and compress the spring. 250 is pressed, and the rotating sleeve 23 is rotated so that multiple sets of slide rods 21 slide into the limiting hole 24 so that the limiting block 22 abuts against the bottom surface of the rotating sleeve 23. Multiple sets of reset springs 18 pull the positioning block 17 to disengage it from the positioning groove 19 and release the positioning of the control sleeve 11. Then the control sleeve 11 is rotated so that multiple sets of locking blocks 12 and locking plates 13 separate and release the locking of the insertion rod 9. Then the insertion rod 9 can be pulled out of the mounting base 7 and the insertion hole 16 to disassemble the winding roller 8.

[0029] In summary, during use or operation of the overall equipment: When in use, the mounting bases 7 connected to both ends of the winding roller 8 abut against the top surface of the fixed frame 6. The insertion rod 9 is inserted into the insertion hole 16 and connected to the mounting base 7. The insertion rod 9 is then inserted into the fixed sleeve 10 and the control sleeve 11. Multiple sets of limiting blocks 15 are positioned and inserted into the limiting groove 14. Rotating the control sleeve 11 causes multiple sets of locking blocks 12 to engage with the locking plate 13. Rotating the rotating sleeve 23 causes multiple sets of sliding rods 21 to slide out of the limiting hole 24 and into the unlocking hole 25. Multiple sets of compression springs 250 push the limiting sleeve 20 against the top of multiple sets of positioning blocks 17, causing the multiple sets of positioning blocks 17 to abut against the positioning groove 19 to position the control sleeve 11. Then, the rotating sleeve 23 is rotated. Multiple sets of limiting blocks 22 abut against the top of the rotating sleeve 23 to restrict the limiting sleeve 20. Multiple sets of push springs 29 push the abutting block 28 to abut against the abutting hole 31 to restrict the rotating sleeve 23, thus completing the fixation of the mounting base 7. The top of the wrapping film wound on the winding roller 8 is connected to the outer wall of the take-up roller 3. The driving component 36 drives the connecting rod 350 to rotate. The connecting rod 350 drives the take-up roller 3 to transmit the wrapping film through the transmission component 37. The limiting roller 35 abuts against the outer wall of the wrapping film to ensure smooth transmission. Multiple sets of cutters 5 cut the wrapping film. The rotating thread is threadedly connected to the mounting bracket 2 to drive the slider 33 to slide, thereby adjusting the tension of the wrapping film through the adjusting roller 34.

[0030] When the winding roller 8 needs to be disassembled, rotating the rotating sleeve 23 drives multiple sets of arc-shaped blocks 27 to slide, pushes the abutment blocks 28 through multiple sets of abutment holes 31 to press the push spring 29, and causes multiple sets of abutment blocks 28 to slide along the inner wall of the annular sleeve 30. The rotating sleeve 23 drives multiple sets of unlocking holes 25 to rotate to the bottom surface of the limiting block 22, releasing the restriction on the limiting sleeve 20. Pushing the limiting sleeve 20 causes multiple sets of sliding rods 21 to be inserted into the unlocking holes 25 and press the compression spring 250. Rotating the rotating sleeve 23 causes multiple sets of sliding rods 21 to slide into the limiting holes 24, causing the limiting block 22 to abut against the bottom surface of the rotating sleeve 23. Multiple sets of reset springs 18 pull the positioning block 17 to disengage it from the positioning groove 19 and release the positioning of the control sleeve 11. Then, rotating the control sleeve 11 causes multiple sets of locking blocks 12 to separate from the locking plate 13 and release the locking of the insertion rod 9. Then the insertion rod 9 can be pulled out of the mounting base 7 and the insertion hole 16 to disassemble the winding roller 8.

[0031] Of all the solutions mentioned above, those involving connections between two components can be selected based on the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. These will not be elaborated on here. For all the fixed connections mentioned above, welding is the preferred option. In all the solutions mentioned above, the operation of electrical components, unless otherwise specified, is controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and wiring connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here. The specific models and specifications of the electrical components involved in this solution need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, and therefore will not be described in detail. Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be described in detail in this utility model. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A slitting device for producing stretch film, comprising a support frame (1), characterized in that: A mounting frame (2) is fixedly mounted on the support frame (1). A winding roller (3) is rotatably mounted on the inner side of the mounting frame (2). A mounting rod (4) is mounted on the outer side of the mounting frame (2). A cutter (5) is fixedly mounted on the outer wall of the mounting rod (4). Multiple sets of cutters (5) are provided. A fixing frame (6) is fixedly mounted on the outer wall of the mounting frame (2). A mounting seat (7) is provided at the top of the fixing frame (6). Multiple sets of winding rollers (8) are provided on the inner side of the mounting frame (2). An insert rod (9) is inserted into the fixing frame (6) and the mounting seat (7). A fixing sleeve (10) is inserted into the top of the rod (9). A control sleeve (11) is rotatably provided at the top of the fixing sleeve (10). A locking block (12) is fixedly provided inside the control sleeve (11). Multiple sets of locking blocks (12) are provided. A locking plate (13) is fixedly provided on the outer wall of the rod (9). Multiple sets of locking plates (13) are provided and are respectively inserted into multiple sets of locking blocks (12). A limiting groove (14) is opened on the outer wall of the rod (9). A limiting block (15) is fixedly provided inside the fixing sleeve (10). Multiple sets of limiting groove (14) and limiting block (15) are provided.

2. The slitting device for producing stretch film according to claim 1, characterized in that: The top of the fixing frame (6) is provided with a socket (16), and the socket (16) is provided in multiple sets and is respectively connected to multiple sets of plug rods (9).

3. A slitting device for producing stretch film according to claim 2, characterized in that: The outer wall of the control sleeve (11) is provided with a positioning block (17). The positioning block (17) is provided in multiple sets and each of the top ends is connected to a reset spring (18). The multiple sets of reset springs (18) are connected to the outer wall of the control sleeve (11). The outer wall of the fixed sleeve (10) is provided with a positioning groove (19). The positioning groove (19) is provided in multiple sets and abuts against the multiple sets of positioning blocks (17).

4. A slitting device for producing stretch film according to claim 3, characterized in that: The outer wall of the fixed sleeve (10) is provided with a limiting sleeve (20), which abuts against the top of multiple positioning blocks (17). The bottom surface of the limiting sleeve (20) is provided with a sliding rod (21), which is provided with multiple sets and each of which is provided with a limiting block (22) at its bottom end. The outer wall of the fixed sleeve (10) is provided with a rotating sleeve (23), which is provided with a limiting hole (24) on its outer wall. The limiting hole (24) is provided with multiple sets and each of which is provided with an unlocking hole (25) at one end. The bottom surface of the limiting sleeve (20) is provided with multiple compression springs (250).

5. A slitting device for producing stretch film according to claim 4, characterized in that: The bottom surface of the rotating sleeve (23) is fixedly provided with an installation ring (26), and the bottom surface of the installation ring (26) is fixedly provided with an arc-shaped block (27). The arc-shaped block (27) is provided with multiple sets and has sliding abutment blocks (28) on both sides. Push springs (29) are connected between the multiple sets of abutment blocks (28) and the arc-shaped block (27). The outer wall of the fixed sleeve (10) is fixedly provided with an annular sleeve (30). The annular sleeve (30) has abutment holes (31) on both sides. The abutment holes (31) are provided with multiple sets and abut against the multiple sets of abutment blocks (28) respectively.

6. A slitting device for producing stretch film according to claim 5, characterized in that: The mounting bracket (2) is threadedly connected to a screw (32) at its top end. The screw (32) is provided with multiple sets, and each set is rotatably connected to a slider (33) at its bottom end. The sliders (33) are rotatably connected to an adjusting roller (34) on their inner sides.

7. A slitting device for producing stretch film according to claim 6, characterized in that: The mounting bracket (2) is rotatably connected to a limiting roller (35).

8. A slitting device for producing stretch film according to claim 7, characterized in that: The inner side of the support frame (1) is rotatably connected to a connecting rod (350), a drive assembly (36) is connected between the connecting rod and the support frame (1), and a transmission assembly (37) is connected between the connecting rod and the take-up roller (3).

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