A winding drum control mechanism for plastic packaging bag winding

Abstract

The utility model belongs to plastic packaging bag production equipment technical field relates to a kind of plastic packaging bag winding with winding drum control mechanism, is constituted by machine body component and support component, and is equipped with roll shaft assembly, magnetic control component and linkage assembly on support component.Machine body component inside motor drive support component and magnetic control component work, realize roll shaft assembly on winding drum switching and winding.The mechanism is through each component cooperation, solved the winding drum switching inconvenience in the winding process of plastic packaging bag, and the problem of poor winding stability, can effectively improve winding efficiency and product quality, ensure the continuity and reliability of winding work.

Description

Technical Field

[0001] This application relates to the technical field of plastic packaging bag production equipment, specifically to a control mechanism for a rewinding drum used for rewinding plastic packaging bags. Background Technology

[0002] In the production of plastic packaging bags, winding is a crucial step. Traditional winding equipment has several problems. Changing the winding drum often requires manual operation, which is inefficient and prone to interruptions, affecting production continuity. Furthermore, the winding drum is not securely fixed during winding, leading to wobbling and poor winding quality. Improper handling during winding drum switching can also stretch the packaging bag, causing deformation and reducing product quality.

[0003] Therefore, there is an urgent need for a winding control mechanism that can automatically and efficiently switch winding drums, ensure a stable winding process, and prevent packaging bag deformation, so as to improve the overall quality and efficiency of plastic packaging bag production and meet the market demand for high-quality packaging products. Summary of the Invention

[0004] To address the aforementioned technical problems, this application resolves the difficulties in switching the winding drum during the winding of plastic packaging bags, as well as the issues that unstable winding drum fixation and easy stretching and deformation of the packaging bag during switching can affect product quality.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a winding drum control mechanism for rewinding plastic packaging bags, comprising a body assembly and a support assembly, wherein the support assembly is provided with multiple roller assemblies, magnetic control assemblies and linkage assemblies.

[0006] The support assembly includes a support frame and an extension rod. The support frame is fixedly mounted on the body assembly, and the extension rod is rotatably disposed at the end of the support frame away from the body assembly.

[0007] The roller assembly includes an outer arc plate, a limiting plate, and an inner arc plate. The roller assembly is rotatably mounted on an extension rod. The roller assembly includes three outer arc plates and three inner arc plates, which are staggered. Limit plates are provided at both ends of the outer arc plates. The arcs of the three outer arc plates and the three inner arc plates are combined to form a circle.

[0008] The magnetic control assembly includes a mounting plate, a first strong magnet, and a second strong magnet. Each roller assembly is equipped with a magnetic control assembly, and the machine body assembly is also equipped with a magnetic control assembly. The magnetic control assembly is connected to the output end of the motor inside the machine body assembly. The mounting plate is set on the roller assembly and has six mounting positions. The first strong magnet and the second strong magnet are each provided with three, and they are staggered in the mounting positions of the mounting plate.

[0009] The linkage component includes a linkage ring, which is mounted on the roller assembly and controls the roller assembly to support the take-up drum.

[0010] Preferably, the roller assembly includes an outer protective plate, an inner protective plate, mounting rods, a long shaft, connecting blocks, connecting rods, turntables, and contact blocks. The outer and inner protective plates are respectively disposed at the two ends of the outer arc-shaped plate. The long shaft is disposed on the extension rod and is provided with multiple mounting rods and two turntables. The two turntables are respectively located at the two ends of the outer arc-shaped plate. Three through shafts are fixedly disposed on the outer arc-shaped plate. The inner end of a connecting rod is rotatably disposed at both ends of each shaft. Three connecting blocks are disposed, and each connecting block slides on a groove of an inner arc-shaped plate. The connecting blocks are rotatably connected to the outer ends of the connecting rods. The contact blocks are fixedly disposed on the outer arc surface of the inner arc-shaped plate.

[0011] Preferably, the limiting plate is installed at an angle on the outer arc plate, with the inner end of the limiting plate pointing to the center of the arc of the outer arc plate, and the limiting plates between two adjacent outer arc plates forming an inverted conical space to restrict the movement of the inner arc plate.

[0012] Preferably, the linkage component includes a short tie rod, and the linkage ring is provided with multiple holes for mounting the short tie rod, which can be adapted to different adjustment requirements by adjusting the mounting position.

[0013] Preferably, the linkage assembly includes a long pull rod, a connecting shaft, a slider, a spring, and a bushing. The long pull rod is slidably mounted on the extension rod. The end of the long pull rod near the linkage ring is rotatably connected to the short pull rod. The end of the long pull rod near the linkage ring is rotatably connected to the connecting shaft. The slider slides on the groove of the extension rod. The connecting shaft is fixedly mounted on the slider. A spring is fixedly mounted on the groove of the extension rod. The spring is fixedly connected to the slider.

[0014] Preferably, a bushing is rotatably provided at one end of the connecting shaft near the machine body assembly, and three push rods are provided on the drive ring, with arc-shaped surfaces on the push rods.

[0015] The technical solution provided in this application has the following advantages compared with the prior art:

[0016] 1: This application achieves automatic switching of the winding drum by setting up multiple roller assemblies and support assemblies. Combined with the roll material cutting, bonding and pressing device on the outsourced production line, it can ensure continuous winding work, reduce manual intervention and improve winding efficiency.

[0017] 2: The roller assembly of this application adopts a structure in which the outer arc plate and the inner arc plate are arranged alternately. When winding, the outer arc plate supports the winding drum, which facilitates its rotation and disassembly. When switching, the inner arc plate can slide outward to fix the winding drum, so as to avoid the packaging bag being stretched and deformed during the switching process and ensure product quality.

[0018] 3: The magnetic control component of this application utilizes a first strong magnet and a second strong magnet to alternately set up, and drives the winding drum to rotate through magnetic connection. This not only ensures the stability of the magnetic connection, but also keeps the axis aligned when the winding drum rotates, further improving the winding stability.

[0019] 4. The linkage component of this application can control the rotation of the linkage ring, which drives the long shaft to rotate, thereby pushing the inner arc plate to move and fix the winding drum. At the same time, by adjusting the mounting hole position of the short tie rod, it can adapt to different winding drum materials and contact block deformations, ensuring stable fixation of the winding drum.

[0020] 5: In this application, when switching roller assembly, the drive ring pushes the connecting shaft and slider to compress the spring through the push rod, which drives the long pull rod and short pull rod to rotate the linkage ring and long shaft, thereby fixing the inner arc plate to the winding drum. The whole process is highly automated and precise in operation. In addition, the spring setting can realize the reset function, ensuring the reliability of the mechanism operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application;

[0022] Figure 2 This is a schematic diagram of the structure of the supporting components of this application;

[0023] Figure 3 This is a schematic diagram of the structure of the linkage component in this application;

[0024] Figure 4 for Figure 3 Enlarged view of the local structure at point A;

[0025] Figure 5 This is a schematic diagram of the structure of the magnetic control component of this application;

[0026] Figure 6 This is a schematic diagram of the contact block structure of this application;

[0027] Figure 7 This is a schematic diagram of the turntable structure in this application.

[0028] In the diagram: 100-Main body assembly; 200-Support assembly; 201-Drive ring; 202-Push rod; 203-Support frame; 204-Extension rod; 300-Roller assembly; 301-Outer protective plate; 302-Inner protective plate; 303-Outer arc plate; 304-Mounting rod; 305-Long shaft; 306-Limiting plate; 307-Inner arc plate; 308-Connecting block; 309-Connecting rod; 310-Turntable; 311-Contact block; 400-Magnetic control assembly; 401-Mounting plate; 402-Isolation plate; 403-Connecting ring; 404-First strong magnet; 405-Second strong magnet; 500-Linkage assembly; 501-Linkage ring; 502-Short pull rod; 503-Long pull rod; 504-Connecting shaft; 505-Slider; 506-Spring; 507-Shaft sleeve. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] like Figures 1 to 7 As shown, a winding drum control mechanism for rewinding plastic packaging bags includes a body assembly 100 and a support assembly 200. The support assembly 200 is provided with a plurality of roller assemblies 300, a magnetic control assembly 400, and a linkage assembly 500.

[0032] Specifically, the machine body assembly 100 contains multiple motors that drive the magnetic control assembly 400 and the support assembly 200 mounted on the machine body assembly 100. The support assembly 200 has three roller assemblies 300. Each roller assembly 300 has a magnetic control assembly 400 mounted at its end near the machine body assembly 100, and a linkage assembly 500 mounted at its end away from the machine body assembly 100. A take-up drum is fitted onto each roller assembly 300. The support assembly 200 supports and drives the three roller assemblies 300, controlling their rotation around the axis of the support assembly 200. This allows for the switching of the packaging bag take-up drum on the roller assembly 300. After the take-up drum's position changes, the outer plastic packaging... The roll material cutting device on the packaging bag processing production line cuts the packaging bags, and the bonding and pressing device attaches the subsequent roll material to the take-up drum of the new roller assembly 300. When the roller assembly 300 is on top, the magnetic control component 400 is driven by the motor on the machine body assembly 100. The magnetic control component 400 drives the magnetic control component 400 on the roller assembly 300 to rotate through magnetic force, thereby driving the take-up drum on the roller assembly 300 to rotate, realizing the winding of the packaging bag roll material. When the support assembly 200 rotates to switch the roller assembly 300, the magnetic control component 400 of the upper roller assembly 300 is disengaged from the magnetic control component 400 of the machine body assembly 100, thereby losing the magnetic connection and not driving the take-up drum on the roller assembly 300 to rotate.

[0033] The working principle of the packaging bag roll material disconnection during roller assembly 300 switching is as follows: When the upper winding drum of roller assembly 300 is fully wound, the diameter sensor triggers a switching signal, which controls the switching of the three roller assemblies 300 through support assembly 200. The surface of the new roller assembly 300 undergoes adhesion pretreatment through adhesive coating, heating, or electrostatic treatment. Subsequently, the guide plate guides the roll material to the bonding position of the new roller assembly 300. At this time, a high-speed pneumatic cutter (equipped with alloy steel blades, driven by a cylinder to achieve instantaneous cutting) or a rotating circular cutter group (rotating in pairs in opposite directions, cutting through the blades) is used. The precise meshing and cutting mechanism quickly cuts the roll material from the transition section between the old roller assembly 300 and the new roller assembly 300 within 0.1-0.2 seconds. If the roll material requires sealing at the edges, a hot cutting device (nickel-chromium alloy blade, heated to 150-300°C) can be used to melt and seal the edges while cutting. At the moment of cutting, the synchronous pressure roller immediately presses the material head against the surface of the roller assembly 300, achieving firm adhesion through adhesive, thermal bonding, electrostatic adsorption, or mechanical interlocking, completing uninterrupted switching and ensuring continuous production.

[0034] The support assembly 200 includes a support frame 203 and an extension rod 204. The support frame 203 is fixedly installed on the body assembly 100, and the extension rod 204 is rotatably disposed at the end of the support frame 203 away from the body assembly 100.

[0035] Specifically, the drive ring 201 is sleeved on the shaft of the support frame 203. The drive ring 201 is driven to rotate by the motor in the machine body assembly 100. In turn, the drive ring 201 drives the extension rod 204 to rotate on the support frame 203. The extension rod 204 drives the three roller shaft assemblies 300 to switch positions.

[0036] The roller assembly 300 includes an outer arc plate 303, a limiting plate 306, and an inner arc plate 307. The roller assembly 300 is rotatably mounted on the extension rod 204. The roller assembly 300 includes three outer arc plates 303 and three inner arc plates 307. The outer arc plates 303 and inner arc plates 307 are staggered. Limiting plates 306 are provided at both ends of the outer arc plates 303. The arcs of the three outer arc plates 303 and the three inner arc plates 307 are combined to form a circle.

[0037] Specifically, when the roller assembly 300 is winding, a winding drum is fitted onto the roller assembly 300 and supported by three outer arc-shaped plates 303, with gaps to facilitate the rotation and disassembly of the winding drum. When winding is finished and switching is required, the inner arc-shaped plate 307 is controlled to slide outward on the outer arc-shaped plate 303 and the limiting plate 306, thereby causing the inner arc-shaped plate 307 to contact and push the winding drum outward. Through the movement of the three inner arc-shaped plates 307, the inner arc-shaped plates 307 are tightly connected to the winding drum, fixing the winding drum and restricting its rotation on the outer arc-shaped plate 303. This prevents stretching and deformation of the packaging when switching the roller assembly 300, which would affect product quality.

[0038] The magnetic control assembly 400 includes a mounting plate 401, a first strong magnet 404, and a second strong magnet 405. Each roller assembly 300 is provided with a magnetic control assembly 400, and the machine body assembly 100 is also provided with a magnetic control assembly 400. The magnetic control assembly 400 is connected to the output end of the motor inside the machine body assembly 100. The mounting plate 401 is provided on the roller assembly 300 and has six mounting positions. The first strong magnet 404 and the second strong magnet 405 are each provided with three, and are staggered in the mounting positions of the mounting plate 401.

[0039] Specifically, the mounting plate 401 of the magnetic control assembly 400 is rotatably mounted on the long shaft 305 of the roller assembly 300. The mounting plate 401 is magnetically connected to the take-up drum on the outer arc plate 303. The motor on the machine body assembly 100 drives the magnetic control assembly 400 on the machine body assembly 100, that is, the output end of the motor drives the mounting plate 401. The mounting plate 401 drives multiple first strong magnets 404 and second strong magnets 405 mounted on it. The first strong magnets 404 and second strong magnets 405 are alternately arranged with the first strong magnets 404 and second strong magnets 405 of the magnetic control assembly 400 on the roller assembly 300. The magnetic force drives the magnetic control assembly 400 on the roller assembly 300 to rotate, thereby driving the take-up drum to rotate. By alternating the first strong magnets 404 and second strong magnets 405, the stability of the magnetic connection is ensured, and deviation of the magnetic connection is avoided. During rotation, the two magnetic control assemblies 400 can be stabilized, keeping their axes aligned, thereby stabilizing the rotation of the take-up drum. When the roller assembly 300 is switched, the magnetic control component 400 on the roller assembly 300 moves away from the magnetic control component 400 on the machine body assembly 100, thereby releasing the control of the winding drum rotation on the roller assembly 300.

[0040] The linkage component 500 includes a linkage ring 501, which is disposed on the roller assembly 300. The linkage ring 501 controls the roller assembly 300 to support the take-up drum.

[0041] Specifically, the linkage ring 501 is driven to rotate around the axis of the long shaft 305 by the control structure. As a result, the linkage ring 501 drives the long shaft 305 to rotate. When the long shaft 305 rotates, it drives the inner arc plate 307 in the roller assembly 300 to move outward, that is, to move away from the axis of the roller assembly 300, thereby contacting and pushing the take-up drum, and finally forming a fixed position.

[0042] like Figure 2 , Figure 3 , Figure 6 and Figure 7As shown, the roller assembly 300 includes an outer protective plate 301, an inner protective plate 302, mounting rods 304, a long shaft 305, connecting blocks 308, connecting rods 309, turntables 310, and contact blocks 311. The outer protective plate 301 and the inner protective plate 302 are respectively disposed at the two ends of the outer arc plate 303. The long shaft 305 is disposed on the extension rod 204. The long shaft 305 is provided with multiple mounting rods 304 and two turntables 310. The two turntables 310 are respectively located at the two ends of the outer arc plate 303. Three through shafts are fixedly disposed on the outer arc plate 303. The inner ends of connecting rods 309 are rotatably disposed at the two ends of each shaft. Three connecting blocks 308 are disposed. Each connecting block 308 slides on a groove of an inner arc plate 307. The connecting block 308 is rotatably connected to the outer end of the connecting rod 309. The contact block 311 is fixedly disposed on the outer arc surface of the inner arc plate 307.

[0043] Specifically, the two ends of the outer arc plate 303 are protected and fixed by the outer protective plate 301 and the inner protective plate 302, so that the axis of the outer arc plate 303 coincides with the axis of the long axis 305. The inner arc plate 307 is restricted and supported by the limiting plate 306 to prevent the long axis 305 from getting too close to the axis of the long axis 305. The inner arc plate 307 falls on the limiting plate 306 and the outer arc plate 303 by gravity. When the inner arc plate 307 is pushed, it slides on the limiting plate 306 and the long axis 305.

[0044] When winding, the outer end face of the inner arc plate 307 is tucked inside the outer arc plate 303. That is, the outer end face of the outer arc plate 303 is further away from the axis of the major axis 305 than the outer end face of the inner arc plate 307. Thus, the outer arc plate 303 supports the winding drum, ensuring the rotation and disassembly of the winding drum.

[0045] When switching, the long shaft 305 is controlled to rotate, which drives the turntable 310 to rotate around the axis of the long shaft 305. The shaft on the turntable 310 pushes a connecting rod 309, so that the end of the connecting rod 309 that contacts the connecting block 308 pushes the connecting block 308, causing the inner arc plate 307 to slide outward on the limiting plate 306 and the long shaft 305, so that the contact block 311 on the inner arc plate 307 contacts the take-up drum. The contact block 311 ensures the stability of the contact and avoids scratches and slippage from hard contact.

[0046] like Figure 7 As shown, the limiting plate 306 is installed at an angle on the outer arc plate 303, and the inner end of the limiting plate 306 points to the center of the arc of the outer arc plate 303. The limiting plates 306 between two adjacent outer arc plates 303 form an inverted cone-shaped space to restrict the movement of the inner arc plate 307.

[0047] Specifically, the inverted conical space formed by the two limiting plates 306 allows the inner arc plate 307 to move towards the axis of the long axis 305 by gravity or the pulling of the connecting rod 309 when it does not need to contact the winding drum. In this process, the space gradually reduced by the limiting plates 306 restricts the movement distance of the inner arc plate 307, and the pulling of the connecting rod 309 ensures the stability of the position of the inner arc plate 307 and avoids shaking.

[0048] like Figure 3 and Figure 4 As shown, the linkage component 500 includes a short pull rod 502, and the linkage ring 501 is provided with a plurality of holes for mounting the short pull rod 502, which can be adapted to different adjustment requirements by adjusting the mounting position.

[0049] Specifically, after prolonged use, the contact block 311 may experience elastic deformation, and the contact capability may vary depending on the material of the winding drum. Therefore, it is necessary to adjust the thrust of the inner arc plate 307 to ensure stable fixation of the winding drum. In use, the pushing distance of the inner arc plate 307 can be adjusted by controlling the shaft on the short pull rod 502 to be inserted into different holes.

[0050] like Figure 3 and Figure 4 As shown, the linkage component 500 includes a long pull rod 503, a connecting shaft 504, a slider 505, a spring 506, and a bushing 507. The long pull rod 503 is slidably mounted on the extension rod 204. One end of the long pull rod 503 near the linkage ring 501 is rotatably connected to the short pull rod 502. One end of the long pull rod 503 near the linkage ring 501 is rotatably connected to the connecting shaft 504. The slider 505 slides on the groove of the extension rod 204. The connecting shaft 504 is fixedly mounted on the slider 505. The spring 506 is fixedly mounted on the groove of the extension rod 204 and is fixedly connected to the slider 505.

[0051] like Figure 2 As shown, a bushing 507 is rotatably provided at one end of the connecting shaft 504 near the machine body assembly 100, and three push rods 202 are provided on the drive ring 201, with an arc-shaped surface on each push rod 202.

[0052] Specifically, when the roller assembly 300 needs to be switched, the motor-driven drive ring 201 inside the machine body assembly 100 rotates on the shaft of the support frame 203, thereby driving the three push rods 202 on it to rotate. The arc surface of the push rods 202 contacts and pushes the bushing 507 of the connecting shaft 504, thereby pushing the connecting shaft 504 to move towards the axis of the drive ring 201. As a result, the connecting shaft 504 pushes the slider 505 to slide on the groove of the extension rod 204 and compresses the spring 506 in the groove. Subsequently, the spring force of the spring 506 is used to reset the slider.

[0053] When the connecting shaft 504 moves toward the axis of the drive ring 201, the connecting shaft 504 pulls the long pull rod 503 to slide on the extension rod 204. As a result, the long pull rod 503 pulls the end of the short pull rod 502 close to the axis of the drive ring 201. As a result, the end of the short pull rod 502 away from the axis of the drive ring 201 pulls the linkage ring 501 and the long shaft 305 to rotate on the extension rod 204, pushing the inner arc plate 307 in the roller assembly 300 and fixing the take-up drum.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control mechanism for a take-up drum used for rewinding plastic packaging bags, characterized in that, It includes a body assembly (100) and a support assembly (200), wherein the support assembly (200) is provided with a plurality of roller assemblies (300), a magnetic control assembly (400) and a linkage assembly (500). The support assembly (200) includes a support frame (203) and an extension rod (204). The support frame (203) is fixedly mounted on the body assembly (100), and the extension rod (204) is rotatably disposed at one end of the support frame (203) away from the body assembly (100). The drive ring (201) is provided with three push rods (202), and the push rods (202) are provided with arc-shaped surfaces; The roller assembly (300) includes an outer arc plate (303), a limiting plate (306), and an inner arc plate (307). The roller assembly (300) is rotatably mounted on the extension rod (204). The roller assembly (300) includes three outer arc plates (303) and three inner arc plates (307). The outer arc plates (303) and the inner arc plates (307) are staggered. The two ends of the outer arc plates (303) are provided with limiting plates (306). The arc of the three outer arc plates (303) and the three inner arc plates (307) is combined to form a circle. The magnetic control assembly (400) includes a mounting plate (401), a first strong magnet (404), and a second strong magnet (405). Each roller assembly (300) is provided with a magnetic control assembly (400), and the machine body assembly (100) is also provided with a magnetic control assembly (400). The magnetic control assembly (400) is connected to the output end of the motor inside the machine body assembly (100). The mounting plate (401) is provided on the roller assembly (300). The mounting plate (401) is provided with six mounting positions. The first strong magnet (404) and the second strong magnet (405) are each provided with three, and are staggered in the mounting positions of the mounting plate (401). The linkage assembly (500) includes a linkage ring (501), which is mounted on the roller assembly (300). The linkage ring (501) controls the roller assembly (300) to support the take-up drum.

2. The control mechanism for a winding drum for rewinding plastic packaging bags according to claim 1, characterized in that, The roller assembly (300) includes an outer protective plate (301), an inner protective plate (302), mounting rods (304), a long shaft (305), a connecting block (308), a connecting rod (309), a turntable (310), and a contact block (311). The outer protective plate (301) and the inner protective plate (302) are respectively disposed at the two ends of the outer arc-shaped plate (303). The long shaft (305) is disposed on the extension rod (204), and multiple mounting rods (304) and two turntables (310) are disposed on the long shaft (305). Two turntables (310) are located at the two ends of the outer arc plate (303). Three through shafts are fixedly installed on the outer arc plate (303). The inner end of a connecting rod (309) is rotatably installed at both ends of each shaft. Three connecting blocks (308) are provided. Each connecting block (308) slides on a groove of an inner arc plate (307). The connecting block (308) is rotatably connected to the outer end of the connecting rod (309). The contact block (311) is fixedly installed on the outer arc surface of the inner arc plate (307).

3. The control mechanism for a take-up drum for plastic packaging bags according to claim 1, characterized in that, The limiting plate (306) is installed at an angle on the outer arc plate (303). The inner end of the limiting plate (306) points to the center of the arc of the outer arc plate (303). The limiting plates (306) between two adjacent outer arc plates (303) form an inverted cone-shaped space to restrict the movement of the inner arc plate (307).

4. The control mechanism for a take-up drum for plastic packaging bags according to claim 1, characterized in that, The linkage component (500) includes a short pull rod (502), and the linkage ring (501) is provided with a plurality of holes for mounting the short pull rod (502), which can be adapted to different adjustment requirements by the mounting position.

5. The control mechanism for a take-up drum for plastic packaging bags according to claim 4, characterized in that, The linkage assembly (500) includes a long pull rod (503), a connecting shaft (504), a slider (505), a spring (506), and a bushing (507). The long pull rod (503) is slidably mounted on the extension rod (204). One end of the long pull rod (503) near the linkage ring (501) is rotatably connected to the short pull rod (502). One end of the long pull rod (503) near the linkage ring (501) is rotatably connected to the connecting shaft (504). The slider (505) slides on the groove of the extension rod (204). The connecting shaft (504) is fixedly mounted on the slider (505). The spring (506) is fixedly mounted on the groove of the extension rod (204). The spring (506) is fixedly connected to the slider (505).

6. The control mechanism for a take-up drum for plastic packaging bags according to claim 5, characterized in that, The coupling (504) is rotatably fitted with a bushing (507) at one end near the body assembly (100).

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