A PVC medical film trimming device

Abstract

This utility model relates to the field of PVC medical film technology, specifically a PVC medical film trimming device, including a worktable, an unwinder, a rewinder, a support assembly, and a trimming assembly. In this PVC medical film trimming device, a lifter drives a sliding frame to rise and fall vertically, allowing precise adjustment of the cutting blade height according to the thickness of the PVC medical film. The positive and negative threaded rods within the sliding frame groove are driven by a servo motor, with opposite thread directions at both ends. Two sets of sliders are connected to left-hand and right-hand threads respectively. When the motor rotates, it drives the sliders to move closer or further apart synchronously, achieving symmetrical adjustment of the blade distance. When installing the blade holder, the free end of the U-shaped blade holder is inserted below the slider. Rotating the handle drives the worm gear to mesh with the worm wheel, causing the screws at both ends of the worm wheel to rotate synchronously, pushing the pin in the groove to extend and embed into the positioning groove of the blade holder, forming a rigid lock—the entire process requires no tools, ensuring assembly stability and convenience.

Description

Technical Field

[0001] This utility model relates to the field of PVC medical film technology, specifically a PVC medical film trimming device. Background Technology

[0002] PVC medical film is a flexible film material made from polyvinyl chloride resin as the base material, with the addition of plasticizers, stabilizers, lubricants and other additives, through processes such as extrusion, calendering or blow molding. Due to its excellent barrier properties, transparency, processability and cost advantages, it has become a core raw material for key medical consumables such as infusion bags, blood bags, catheter packs, and surgical films in the medical field. When processing PVC medical membrane rolls, the edges need to be cut. Traditional cutting equipment is not convenient for stable centering and adjusting the height and spacing of the cutting blade. At the same time, traditional cutting blades are fixed to the slider with bolts. After a period of use, the cutting blades will wear down. If they are not replaced in time, burrs will easily appear. The bolt-fixed cutting blades are also inconvenient to disassemble and assemble. Utility Model Content

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a PVC medical film trimming device.

[0004] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a PVC medical film trimming device, comprising a worktable, an unwinder, a rewinder, a support assembly, and a trimming assembly. An unwinder and a rewinder are respectively arranged on the front and rear sides of the worktable. A support assembly is arranged in the middle of the worktable. The support assembly includes side plates, a top plate, a first support roller, and a second support roller. Two sets of side plates are symmetrically arranged on the left and right sides above the worktable. A top plate is arranged above the two sets of side plates. Two sets of symmetrically arranged first support rollers are arranged on the lower front and rear sides between the two sets of side plates. Two sets of symmetrically arranged second support rollers are arranged on the upper front and rear sides between the two sets of side plates. The two sets of second support rollers are located between the two sets of first support rollers. The trimming assembly includes a motor, a lifter, a slide frame, positive and negative threaded rods, a slider, a connector, a tool holder, and a cutting blade. The output end of the lifter passes through the top plate and is connected to the slide frame. The slider is positioned above two sets of second support rollers. A groove is provided below the slide frame, and positive and negative threaded rods are arranged within the groove. One end of the motor output passes through the slide frame and is connected to the positive and negative threaded rods. The sliders are arranged in two symmetrical sets, with the upper part of the two sets of sliders extending into the groove and threadedly connected to the positive and negative threaded rods. A connector for mounting the tool holder is provided below the slider, which protrudes from the slide frame. A cutting blade is positioned below the connector.

[0005] To ensure the stability of the sliding frame's lifting and lowering, this utility model is improved by providing a guide rod that penetrates the top plate on the sliding frame, with the guide rod arranged in two symmetrical sets.

[0006] To facilitate the assembly and disassembly of the tool holder, this utility model is improved as follows: the connecting component includes a handle, a worm, a worm wheel, a screw, and a pin; a cavity is provided on the inner side of the lower part of the slider, and a worm wheel and a worm are arranged in the cavity, with the worm wheel and worm meshing; grooves are also symmetrically arranged on the front and rear sides of the lower part of the slider, and pins are arranged in the grooves; screws are symmetrically arranged on the front and rear sides of the worm wheel, and one end of the corresponding screw extends into the corresponding groove and is threadedly connected to one end of the corresponding pin; the tool holder is U-shaped with an upper opening, and positioning grooves adapted to the other end of the pin are provided on the two free ends of the tool holder.

[0007] Preferably, the edge of the handle is provided with several sets of friction textures.

[0008] Preferably, the motor is a servo motor.

[0009] Preferably, the workbench is also provided with support legs at the four corners below.

[0010] (III) Beneficial Effects Compared with the prior art, this utility model provides a PVC medical film trimming device, which has the following beneficial effects: This PVC medical film trimming device uses a lifter to drive the sliding frame to rise and fall vertically, allowing for precise adjustment of the cutting blade height according to the thickness of the PVC medical film. The positive and negative thread bars in the slide frame groove are driven by a servo motor. The threads at both ends of the positive and negative thread bars have opposite directions. The two sets of sliders are connected to the left-hand and right-hand threads respectively. When the motor rotates, it drives the sliders to move closer or separate synchronously, so as to realize the symmetrical adjustment of the tool distance. When installing the tool holder, insert the free end of the U-shaped tool holder under the slider, turn the handle to drive the worm gear to mesh with the worm wheel and rotate. The screws at both ends of the worm wheel rotate synchronously, pushing the pin in the groove to extend and embed into the positioning groove of the tool holder, forming a rigid lock. The whole process requires no tools, ensuring the stability and convenience of assembly. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a bottom view of the structure of this utility model; Figure 3 This is a partial side view of the structure of this utility model; Figure 4 This is a partial explosion diagram of the structure of this utility model.

[0012] In the diagram: 1. Workbench; 2. Unwinder; 3. Rewinder; 4. Side plate; 5. Top plate; 6. First support roller; 7. Second support roller; 8. Motor; 9. Lifter; 10. Slide frame; 11. Positive and negative toothed rods; 12. Slider; 13. Tool holder; 14. Cutting blade; 15. Guide rod; 16. Handle; 17. Worm gear; 18. Worm wheel; 19. Screw; 20. Pin; 21. Friction pattern; 22. Support leg. Detailed Implementation

[0013] 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.

[0014] Please see Figures 1-4 A PVC medical film trimming device includes a workbench 1, an unwinder 2, a rewinder 3, a support assembly, and a trimming assembly. The unwinder 2 and the rewinder 3 are respectively arranged on the front and rear sides of the workbench 1. The support assembly is arranged in the middle part of the workbench 1. The support assembly includes side plates 4, a top plate 5, a first support roller 6, and a second support roller 7. Two sets of side plates 4 are symmetrically arranged on the left and right sides above the workbench 1. The top plate 5 is arranged above the two sets of side plates 4. Two sets of first support rollers 6 are symmetrically arranged on the lower front and rear sides between the two sets of side plates 4. Two sets of second support rollers 7 are symmetrically arranged on the upper front and rear sides between the two sets of side plates 4. The two sets of first support rollers 7 are located between the two sets of first support rollers 6. The workbench 1 is provided with four support legs 22 at the four corners. In this embodiment, both the unwinder 2 and the rewinder 3 include a roller frame, a roller body and a drive device. The drive devices of the unwinder 2 and the rewinder 3 work together to complete the unwinding of the material roll. The material roll passes through the first support roller 6 located below one set, the two sets of second support rollers 7 located above, and the other set of first support rollers 6 located below. At this time, the trimming assembly completes the trimming of the material edge. In this embodiment, the trimming assembly includes a motor 8, a lifter 9, a sliding frame 10, positive and negative toothed rods 11, a slider 12, a connector, a knife holder 13, and a cutting knife 14. The output end of the lifter 9 passes through the top plate 5 and is connected to the sliding frame 10. The slider 12 is disposed above two sets of the second support rollers 7. A sliding groove is provided below the sliding frame 10, and the positive and negative toothed rods 11 are disposed in the sliding groove. One end of the output end of the motor 8 passes through the sliding frame 10 and is connected to the positive and negative toothed rods 11. The sliders 12 are arranged in two symmetrical sets. The upper part of the two sets of sliders 12 extends into the sliding groove and is threadedly connected to the positive and negative toothed rods 11. A connector for mounting the knife holder 13 is provided below the slider 12, which protrudes from the sliding frame 10. The cutting knife 14 is disposed below the connector. Input the target membrane width, and the controller sends a rotation signal to the servo motor 8. The motor 8 drives the positive and negative toothed rods 11 in the slide groove of the slide frame 10 to rotate (speed adjustable from 0-50 r / min): The threads at both ends of the positive and negative toothed rod 11 have opposite directions of rotation. The two sets of sliders 12 are connected to the left-hand and right-hand threads respectively, and move closer (reducing the tool distance) or separate (increasing the tool distance) synchronously with the rotation of the rod. The servo motor 8 has a built-in encoder that provides real-time position feedback. It automatically stops when the blade distance reaches a preset value (e.g., 1000mm), with a centering deviation of ≤0.5mm, ensuring that the trimming width on both sides of the membrane is consistent. Then press the “Height Adjustment” button on the controller. The lifting device 9 (servo electric cylinder, lifting accuracy ±0.01mm) drives the slide frame 10 to rise and fall in the vertical direction. The guide rod 15 restricts the tilt of the slide frame 10. After the height adjustment is completed, the lifting device 9 automatically locks to prevent the height from shifting due to vibration during the trimming process. At this time, the cutting blade 14 cuts the material.

[0015] When the cutting blade 14 needs to be replaced, the connecting parts include a handle 16, a worm 17, a worm wheel 18, a screw 19, and a pin 20. The lower part of the slider 12 has a cavity on its inner side, and the worm wheel 18 and the worm 17 are arranged in the cavity. The worm wheel 18 and the worm 17 mesh. The lower part of the slider 12 also has symmetrical grooves on its front and rear sides, and the pin 20 is arranged in the grooves. The worm wheel 18 has symmetrical screws 19 arranged on its front and rear sides. One end of the corresponding screw 19 extends into the corresponding groove and is threaded to one end of the corresponding pin 20. The blade holder 13 is U-shaped with an upper opening. The two free ends of the blade holder 13 are provided with positioning grooves that are adapted to the other end of the pin 20. The handle 16 has several sets of friction textures 21 on its edge. When the unwinder 2 and the rewinder 3 stop, the lifter 9 drives the slide frame 10 to rise, and the handle 16 is rotated in the opposite direction: the worm gear 17 drives the worm wheel 18 to rotate in the opposite direction, which drives the screw 19 to retract the pin 20. The pin 20 is disengaged from the positioning groove of the tool holder 13, and the old tool holder 13 can be removed. After replacing the tool holder 13, repeat the initial installation process. The pin 20 is inserted into the positioning groove to form a lock. The entire tool changing process does not require tools and is easy to operate.

[0016] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0017] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0018] 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.

Claims

1. A PVC medical film trimming device, comprising a worktable (1), an unwinder (2), a rewinder (3), a support assembly, and a trimming assembly, characterized in that: The workbench (1) is provided with an unwinder (2) and a rewinder (3) on the front and rear sides respectively. The middle part of the workbench (1) is provided with a support assembly, which includes a side plate (4), a top plate (5), a first support roller (6) and a second support roller (7). Two sets of side plates (4) are symmetrically arranged on the left and right sides above the workbench (1). A top plate (5) is provided above the two sets of side plates (4). Two sets of first support rollers (6) are symmetrically arranged on the lower part of the front and rear sides between the two sets of side plates (4). Two sets of second support rollers (7) are symmetrically arranged on the upper part of the front and rear sides between the two sets of side plates (4). The two sets of second support rollers (7) are located between the two sets of first support rollers (6). The trimming assembly includes a motor (8), a lifter (9), a slide frame (10), a positive and negative toothed rod (11), a slider (12), a connector, a knife holder (13), and a cutting knife (14). The output end of the lifter (9) passes through the top plate (5) and is connected to the slide frame (10). The slider (12) is set above two sets of the second support rollers (7). A groove is provided below the slide frame (10), and a positive and negative toothed rod (11) is provided in the groove. One end of the output end of the motor (8) passes through the slide frame (10) and is connected to the positive and negative toothed rod (11). The slider (12) is arranged in two symmetrical sets. The upper part of the two sets of sliders (12) extends into the groove and is threadedly connected to the positive and negative toothed rod (11). A connector for installing the knife holder (13) is provided below the slider (12) protruding from the slide frame (10). A cutting knife (14) is provided below the connector.

2. The PVC medical film trimming device according to claim 1, characterized in that: The sliding frame (10) is also provided with a guide rod (15) that passes through the top plate (5), and the guide rod (15) is arranged in two symmetrical sets.

3. The PVC medical film trimming device according to claim 2, characterized in that: The connector includes a handle (16), a worm (17), a worm wheel (18), a screw (19), and a pin (20). The lower part of the slider (12) has a cavity on its inner side, in which the worm wheel (18) and the worm (17) are arranged. The worm wheel (18) and the worm (17) mesh. The lower part of the slider (12) also has symmetrical grooves on its front and rear sides, in which the pin (20) is arranged. The worm wheel (18) has symmetrical screws (19) on its front and rear sides. One end of the corresponding screw (19) extends into the corresponding groove and is threaded to one end of the corresponding pin (20). The tool holder (13) is U-shaped with an upper opening. The two free ends of the tool holder (13) are provided with positioning grooves that are adapted to the other end of the pin (20).

4. The PVC medical film trimming device according to claim 3, characterized in that: The handle (16) has several sets of friction textures (21) on its edge.

5. A PVC medical film trimming device according to claim 4, characterized in that: The motor (8) is a servo motor.

6. A PVC medical film trimming device according to claim 5, characterized in that: The workbench (1) is also provided with support legs (22) at the four corners below.

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