A cutting mechanism for LLDPE polyethylene wrapping film

Abstract

This utility model belongs to the field of LLDPE polyethylene film cutting technology and discloses an LLDPE polyethylene wrapping film cutting mechanism, including a mounting frame. A sliding and retractable cutting blade is mounted on the inner top surface of the mounting frame. A slide rail is fixedly connected to the front surface of the mounting frame, and an electric slider is slidably connected to the slide rail. A support block is fixedly connected to the outer surface of the electric slider, and a tension adjusting rod is fixedly connected to the lower side of the outer surface of the support block. A slot is provided on the support block, and a motor is fixedly connected to the inner surface of the slot. A lead screw is fixedly connected to the output end of the motor, and a threaded block is threadedly connected to the lead screw. A clamping plate is fixedly connected to the outer surface of the threaded block. Through the cooperation of the tension adjusting rod, the slot, the motor, the lead screw, the threaded block, and the clamping plate, the film can be clamped on both sides of the cutting position during cutting, preventing displacement, wrinkling, or stretching deformation of the film material during the cutting process. This allows the cutting blade to accurately cut along the preset cutting line, thereby ensuring cutting accuracy and obtaining a neat and smooth cut.

Description

Technical Field

[0001] This utility model belongs to the field of LLDPE polyethylene film cutting technology, specifically an LLDPE polyethylene wrapping film cutting mechanism. Background Technology

[0002] LLDPE (linear low-density polyethylene) stretch film has become a core packaging material in logistics packaging (pallet wrapping), industrial cushioning (box filling), and food protection (moisture-proof covering) due to its high ductility (elongation at break ≥500%), low crystallinity (density 0.915~0.925g / cm³), thinness (typically 15-50μm), and toughness. However, when cutting existing stretch film, workers need to hold the film in one hand and grip the cutting tool tightly in the other. During the cutting process, manual cutting can lead to uneven cuts, causing the cutting line to tilt and affecting the cutting quality. At the same time, unstable grip can cause the cutting to be interrupted, thus affecting cutting efficiency and wasting time.

[0003] Meanwhile, a wrapping film cutting device with application number CN202022083502.9 includes a clamping plate 1, a clamping plate 2 below the clamping plate 1, and support plates symmetrically arranged on one side of the clamping plate 1 and the clamping plate 2. The bottom end of the clamping plate 1 is provided with a sleeve, and the top end of the clamping plate 2 is provided with a connecting rod inserted into the sleeve. The top end of the connecting rod is provided with a movable block. The two support plates are connected by a connecting mechanism. A collar is fitted on the connecting mechanism, and a cutting mechanism is provided on one side of the collar. Each of the two support plates has a clamping plate 1 and a clamping plate 2 located on one side of the clamping plate 1. One end of the clamping plate 2 is connected to the support plate through the clamping mechanism. The connecting mechanism includes a connecting tube, an insert rod, a slider, a sliding groove, and a locking block. The clamping mechanism is fixedly installed on one side of one of the support plates. An insert rod connected to the side wall of the other support plate is inserted inside the connecting tube. One end of the insert rod is provided with a slider. Locking blocks are symmetrically arranged on both sides of the slider. The inner wall of the connecting tube is symmetrically provided with sliding grooves that slide in connection with the locking blocks.

[0004] However, the following problems were found in the implementation of the relevant technology: the tension device is fixed and cannot dynamically adjust the tension according to the change of the membrane roll diameter or the natural decrease of the membrane tension as the diameter of the mother roll gradually decreases during unwinding. This results in excessive tension in the initial stage of the membrane roll, leading to breakage, and insufficient tension in the later stage, leading to loose and wrinkled membrane surface and severe burrs on the cut. At the same time, the clamping and fixing scheme is unreasonable, and the cutting accuracy is difficult to guarantee. The clamping is only set on one side of the cutting line, and the membrane is easy to slide on the other side during cutting, resulting in uneven cuts or wrinkles.

[0005] Therefore, we propose an LLDPE polyethylene wrapping film cutting mechanism. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides an LLDPE polyethylene wrapping film cutting mechanism, which has the advantages of precisely controlling the tension through an adjustable tension adjustment rod to ensure that the film is always in a taut but not stretched state, and can clamp both sides of the cutting position for cutting, preventing the film material from shifting, wrinkling or stretching during the cutting process.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an LLDPE polyethylene wrapping film cutting mechanism, comprising a mounting frame, a sliding and retractable cutting blade mounted on the inner top surface of the mounting frame, a slide rail fixedly connected to the front surface of the mounting frame, an electric slider slidably connected to the slide rail, a support block fixedly connected to the outer surface of the electric slider, a tension adjusting rod fixedly connected to the lower side of the outer surface of the support block, a slot provided on the support block, a motor fixedly connected to the inner surface of the slot, a lead screw fixedly connected to the output end of the motor, a threaded block threadedly connected to the lead screw, a clamping plate fixedly connected to the outer surface of the threaded block, a groove provided between the tension adjusting rod and the clamping plate, a rotating rod rotatably connected within the groove, and a conveying roller fixedly connected to the outer surface of the rotating rod.

[0008] Preferably, an opening is provided in the middle of the tension adjusting rod and the clamping plate.

[0009] Preferably, a limiting plate is fixedly connected to the upper end of the slide rail, and the limiting plate is fixedly connected to the mounting bracket.

[0010] Preferably, a fixing block is fixedly connected inside the slot, and the fixing block is rotatably connected to the lead screw.

[0011] Preferably, a sliding rod is fixedly connected to the fixing block, and the threaded block is slidably connected to the sliding rod.

[0012] Preferably, the mounting frame is equipped with a winding and rewinding device.

[0013] Preferably, the winding device is detachably connected to a drum, the length of which is shorter than that of the conveyor roller and the midpoint of which is aligned with the conveyor roller.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model utilizes the cooperation of a slide rail, an electric slider, a support block, a tension adjusting rod, a groove, a rotating rod, and a conveying roller. The tension is precisely controlled by the height-adjustable tension adjusting rod, which changes the pressure of the rod on the film surface and precisely controls the stress on the film. This ensures that the film remains in a stable state of tension without stretching during the winding process, thereby avoiding film breakage or damage and reducing material waste.

[0015] 2. This utility model, through the cooperation of a tension adjusting rod, slot, motor, lead screw, threaded block, and clamping plate, can clamp both sides of the cutting position during cutting, preventing the film material from shifting, wrinkling, or stretching during the cutting process. This allows the cutting blade to accurately cut along the preset cutting line, thereby ensuring cutting precision, obtaining neat and smooth cuts, avoiding cutting errors caused by film material movement or excessive stretching, reducing waste caused by poor cutting, reducing material loss, and improving material utilization. Attached Figure Description

[0016] Figure 1 This is a bottom view of the overall structure of this utility model; Figure 2 This is a side view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the slide rail connection structure of this utility model; Figure 4 This is a schematic diagram of the support block connection structure of this utility model.

[0017] In the diagram: 1. Mounting bracket; 2. Sliding telescopic cutting blade; 3. Slide rail; 4. Electric slider; 5. Support block; 6. Tension adjusting rod; 7. Slot; 8. Motor; 9. Lead screw; 10. Threaded block; 11. Clamping plate; 12. Groove; 13. Rotating rod; 14. Conveying roller; 15. Slide rod; 16. Winding and rewinding device. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figures 1 to 4 As shown, this utility model provides an LLDPE polyethylene wrapping film cutting mechanism, including a mounting frame 1. A sliding and retractable cutting blade 2 is mounted on the inner top surface of the mounting frame 1. A slide rail 3 is fixedly connected to the front surface of the mounting frame 1. An electric slider 4 is slidably connected to the slide rail 3. A support block 5 is fixedly connected to the outer surface of the electric slider 4. A tension adjusting rod 6 is fixedly connected to the lower side of the outer surface of the support block 5. A slot 7 is provided on the support block 5. A motor 8 is fixedly connected to the inner surface of the slot 7. A lead screw 9 is fixedly connected to the output end of the motor 8. A threaded block 10 is threadedly connected to the lead screw 9. A clamping plate 11 is fixedly connected to the outer surface of the threaded block 10. A groove 12 is provided on the tension adjusting rod 6 and the clamping plate 11. A rotating rod 13 is rotatably connected in the groove 12. A conveying roller 14 is fixedly connected to the outer surface of the rotating rod 13.

[0020] Specifically, an opening is provided in the middle of the tension adjusting rod 6 and the clamping plate 11.

[0021] Furthermore, a limiting plate is fixedly connected to the upper end of the slide rail 3. The limiting plate is fixedly connected to the mounting bracket 1 to limit the sliding range of the electric slider 4 and prevent it from derailing.

[0022] Furthermore, a fixing block is fixedly connected inside the slot 7, and the fixing block is rotatably connected to the lead screw 9.

[0023] It is worth noting that a slide rod 15 is fixedly connected to the fixed block, and the threaded block 10 is slidably connected to the slide rod 15 to prevent the threaded block 10 from rotating.

[0024] It is worth noting that the mounting frame 1 is equipped with a winding and rewinding device 16.

[0025] It is worth mentioning that a roll is detachably connected to the winding device 16. The length of the roll is shorter than that of the conveyor roller 14 and its midpoint is aligned with the conveyor roller 14, ensuring that the LLDPE polyethylene film is wound onto the winding device 16.

[0026] The sliding retractable cutting blade 2, motor 8, conveying roller 14, and winding and rewinding device 16 are existing technologies and will not be described in detail. Additionally, this utility model also includes a power supply, controller, and switch, which are not the main technical points of this patent and will not be described in detail. The "front, back, left, and right" perspectives of this device are... Figure 1 The direction shown in the diagram is the reference.

[0027] Working principle: In use, one end of the LLDPE polyethylene film is passed between the tension adjusting rod 6 and the clamping plate 11 and connected to the winding device 16. The winding device 16 winds up the LLDPE polyethylene film. If the LLDPE polyethylene film is too loose during the winding process, the electric slider 4 slides on the slide rail 3 driven and controlled by the power system. This, in turn, drives the tension adjusting rod 6 to slide through the support block 5, tightening the LLDPE polyethylene film and ensuring its tension. The LLDPE polyethylene film is then conveyed by the conveyor roller 1. When the LLDPE polyethylene film needs to be cut, the motor 8 in the slot 7 drives the lead screw 9 to rotate. The threaded block 10 moves linearly on the lead screw 9 through the action of the thread. As a result, the threaded block 10 drives the clamping plate 11 to move downward. The conveying roller 14 on the clamping plate 11 contacts the conveying roller 14 on the tension adjusting rod 6. The LLDPE polyethylene film is clamped and fixed by the two conveying rollers 14. Then, the sliding telescopic cutting blade 2 extends out and slides, thereby cutting the LLDPE polyethylene film by sliding in the openings on the tension adjusting rod 6 and the clamping plate 11.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] 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 cutting mechanism for LLDPE polyethylene winding film, comprising a mounting frame (1), characterized in that: The mounting bracket (1) has a sliding retractable cutting blade (2) installed on its inner top surface. The mounting bracket (1) has a slide rail (3) fixedly connected to its front surface. An electric slider (4) is slidably connected to the slide rail (3). A support block (5) is fixedly connected to the outer surface of the electric slider (4). A tension adjusting rod (6) is fixedly connected to the lower side of the outer surface of the support block (5). A slot (7) is provided on the support block (5). A motor (8) is fixedly connected to the inner surface of the slot (7). A lead screw (9) is fixedly connected to the output end of the motor (8). A threaded block (10) is threadedly connected to the lead screw (9). A clamping plate (11) is fixedly connected to the outer surface of the threaded block (10). A groove (12) is provided on the tension adjusting rod (6) and the clamping plate (11). A rotating rod (13) is rotatably connected in the groove (12). A conveying roller (14) is fixedly connected to the outer surface of the rotating rod (13).

2. The LLDPE polyethylene wrapping film cutting mechanism according to claim 1, characterized in that: An opening is provided in the middle of the tension adjusting rod (6) and the clamping plate (11).

3. The LLDPE polyethylene wrapping film cutting mechanism according to claim 1, characterized in that: The upper end of the slide rail (3) is fixedly connected to a limiting plate, and the limiting plate is fixedly connected to the mounting bracket (1).

4. The LLDPE polyethylene wrapping film cutting mechanism according to claim 1, characterized in that: A fixing block is fixedly connected inside the slot (7), and the fixing block is rotatably connected to the lead screw (9).

5. The LLDPE polyethylene wrapping film cutting mechanism according to claim 4, characterized in that: A slide rod (15) is fixedly connected to the fixed block, and the threaded block (10) is slidably connected to the slide rod (15).

6. The LLDPE polyethylene wrapping film cutting mechanism according to claim 1, characterized in that: The mounting frame (1) is equipped with a winding and rewinding device (16).

7. The LLDPE polyethylene wrapping film cutting mechanism according to claim 6, characterized in that: A detachable drum is connected to the winding and rewinding device (16), the length of which is shorter than that of the conveyor roller (14) and the midpoint of which is aligned with the conveyor roller (14).

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