PVC decorative film production conveying bidirectional stretching device

Abstract

The utility model provides a PVC decorative film production conveying bidirectional stretching device relates to the technical field of plastic film processing, include: bottom plate, workstation, workstation fixed connection is in the surface of bottom plate, a plurality of first support frame, a plurality of first support frame all are fixedly connected to the surface of bottom plate, second support frame, second support frame fixed connection is in the surface of workstation, width adjusting mechanism, width adjusting mechanism includes air cylinder, lifting plate and two groups of rolling parts, air cylinder fixed connection is in the surface of second support frame, lifting plate fixed connection is in the output shaft of air cylinder, two groups of rolling parts all include connecting rod, swing arm and rolling wheel, thereby effectively solved the film edge in the background art and produced the problem of indentation, scratch or local tearing, significantly improved the surface quality and yield.

Description

Technical Field

[0001] This utility model relates to the field of plastic film processing technology, and in particular to a bidirectional stretching device for producing and conveying PVC decorative film. Background Technology

[0002] The biaxial stretching device for PVC decorative film production is used to stretch the formed film longitudinally and laterally to improve its strength and dimensional stability. Longitudinal stretching is achieved through multiple sets of heated rollers. The film passes sequentially through the upper and lower heated rollers, utilizing the speed difference between the later rollers and the earlier ones to stretch it along the running direction while heated. Traditional lateral stretching uses chain clamps to hold the film edge and simultaneously expand it outwards to achieve widening. While this method provides stable results, it is prone to leaving indentations or causing tears at the film edge.

[0003] However, the rigid contact between the chain clamp and the film edge causes indentations, scratches, or localized tears at the edge, which has a significant impact, especially on high-gloss, thin, or flexible PVC decorative films. This not only reduces surface quality but also easily causes film edge cracking during stretching, affecting the yield and product grade.

[0004] Therefore, it is necessary to provide a biaxial stretching device for the production and conveying of PVC decorative film to solve the above problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a bidirectional stretching device for producing and conveying PVC decorative film.

[0006] This utility model provides a bidirectional stretching device for the production, conveying, and manufacturing of PVC decorative film, comprising: Base plate; A workbench, which is fixedly connected to the surface of the base plate; Multiple first support frames are fixedly connected to the surface of the base plate; The second support frame is fixedly connected to the surface of the workbench; The width adjustment mechanism includes a cylinder, a lifting plate, and two sets of rolling components. The cylinder is fixedly connected to the surface of the second support frame, and the lifting plate is fixedly connected to the output shaft of the cylinder. Each set of rolling components includes a connecting rod, a swing arm, and rolling wheels. There are two connecting rods and two swing arms. The two connecting rods are fixedly connected to both ends of the lifting plate, and one end of each swing arm is rotatably connected to the circumferential surface of the two connecting rods. The two ends of each rolling wheel are rotatably connected to the other end of each swing arm. When the cylinder drives the lifting plate to press down, the two rolling wheels rotate outward around their respective connecting rods as the origin, thereby pushing the film edge to extend and increase the width.

[0007] Preferably, the device further includes multiple sets of rolling components, each set of which includes a motor, a heated roller, and gears. Two heated rollers and two gears are provided. Both ends of the two heated rollers are rotatably connected to the first support frame. The two gears are respectively fixedly connected to one end of the two heated rollers and mesh with each other. The motor is fixedly connected to the surface of the first support frame, and its output end is fixedly connected to the other end of one of the heated rollers. The motor is an intermittently operating motor used to control the distance the film advances each time to be the same as the length of the rolling roller.

[0008] Preferably, the device further includes two sets of pressurizing components. Each set of pressurizing components includes a first connecting plate, a spring, and a second connecting plate. The first connecting plate is fixedly connected to the surface of one of the swing arms on one side of the lifting plate, and the second connecting plate is fixedly connected to the surface of the other swing arm on the same side of the lifting plate. One end of the spring is fixedly connected to the surface of the first connecting plate, and the other end of the spring is fixedly connected to the surface of the second connecting plate. The spring is stretched when the swing arm swings to increase the pressure of the rolling roller on the membrane and improve the friction.

[0009] Preferably, the surfaces of both rollers are coated with a polyurethane layer.

[0010] Preferably, the cylinder controls the reciprocating motion of the lifting plate, causing the rolling roller to push the film edge to extend multiple times during each pause, thereby increasing the film width to a sufficient extent.

[0011] Compared with related technologies, the PVC decorative film production, conveying, biaxial stretching device provided by this utility model has the following advantages: 1. This utility model uses rolling rollers with a polyurethane coating to simultaneously roll and push the film outward from both sides of the film, replacing the traditional chain clamping and widening method. This avoids the indentation, scratches or tears caused by rigid clamping to the film edge, effectively protecting the edge integrity of high-gloss, thin and soft PVC decorative film, significantly improving product surface quality and yield, and solving the technical problem of product grade reduction caused by clamping damage in the background art.

[0012] 2. This utility model uses a cylinder to drive the lifting plate to drive the rolling roller to reciprocate. Combined with the intermittent conveying of the motor, the widening operation can be completed in steps during each pause. Combined with the spring pressure structure, the friction between the rolling roller and the film surface is increased, realizing stable and controllable non-clamping width adjustment. It is not only simple in structure and runs smoothly, but also suitable for decorative films of different thicknesses and materials, with good adaptability and production flexibility. Attached Figure Description

[0013] Figure 1 A first-view perspective perspective view provided for this utility model; Figure 2A second-view perspective perspective view provided for this utility model; Figure 3 A partial exploded view provided for this utility model.

[0014] The following are the labels in the diagram: 1. Base plate; 2. Workbench; 3. First support frame; 401. Motor; 402. Heating roller; 403. Gear; 5. Second support frame; 601. Cylinder; 602. Lifting plate; 701. Connecting rod; 702. Swing arm; 703. Rolling roller; 801. First connecting plate; 802. Spring; 803. Second connecting plate. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Please refer to the following: Figures 1 to 3 A biaxial stretching device for producing and conveying PVC decorative film, comprising: Base plate 1; Workbench 2 is fixedly connected to the surface of base plate 1; Multiple first support frames 3 are fixedly connected to the surface of the base plate 1; The second support frame 5 is fixedly connected to the surface of the workbench 2; The width adjustment mechanism includes a cylinder 601, a lifting plate 602, and two sets of rolling components. The cylinder 601 is fixedly connected to the surface of the second support frame 5, and the lifting plate 602 is fixedly connected to the output shaft of the cylinder 601. Each set of rolling components includes a connecting rod 701, a swing arm 702, and a rolling wheel 703. There are two connecting rods 701 and two swing arms 702. The two connecting rods 701 are fixedly connected to both ends of the lifting plate 602, and one end of each swing arm 702 is rotatably connected to the circumferential surface of the two connecting rods 701. The two ends of each rolling wheel 703 are rotatably connected to the other end of each swing arm 702. When the cylinder 601 drives the lifting plate 602 to press down, the two rolling wheels 703 rotate outward with their respective connecting rods 701 as the origin, thereby pushing the film edge to extend and increase the width.

[0017] In the specific implementation process, the PVC film is first fed in from the front rolling assembly and placed above the worktable 2. Then, the cylinder 601 starts to move, pushing the lifting plate 602 downward. The two rolling rollers 703 descend together. When they contact the surface of the film, the swing arm 702 swings outward around the connecting rod 701. The rolling rollers 703 on both sides press down and roll to the left and right, slowly pushing the edge of the film open to increase the width. After the width reaches the required level, the cylinder 601 lifts the lifting plate 602, the rolling rollers leave the film surface, and the film continues to move forward to the next step.

[0018] refer to Figures 1 to 3 As shown, it also includes multiple sets of rolling components. Each set of rolling components includes a motor 401, a hot roller 402, and a gear 403. There are two hot rollers 402 and two gears 403. Both ends of the two hot rollers 402 are rotatably connected to the first support frame 3. The two gears 403 are respectively fixedly connected to one end of the two hot rollers 402 and the two gears 403 mesh with each other. The motor 401 is fixedly connected to the surface of the first support frame 3, and the output end of the motor 401 is fixedly connected to the other end of one of the hot rollers 402. The motor 401 is an intermittent motor used to control the distance the film advances each time to be the same as the length of the rolling roller 703.

[0019] In the above embodiment, after the motor 401 starts, it drives the two hot rollers 402 to rotate, conveying the film forward a fixed distance. Then the motor stops, and the film stops as well. This motor works intermittently, with the same running time and speed each time, so the length of the film conveyed each time is also the same, for example, 100mm each time. In this way, each time it stops, the position of the film is precisely aligned with the bottom of the rolling roller 703, preparing for the subsequent width adjustment and avoiding misalignment.

[0020] It should be further explained that motor 401 is a stepper motor, controlled by PLC. It advances 100mm every 5 seconds and stops for 3 seconds. Gear 403 meshes and drives the transmission to ensure that the two hot rollers 402 are synchronized and to prevent the film from deviating.

[0021] refer to Figures 1 to 3 As shown, it also includes two sets of pressurizing components. Each set of pressurizing components includes a first connecting plate 801, a spring 802, and a second connecting plate 803. The first connecting plate 801 is fixedly connected to the surface of one of the swing arms 702 on one side of the lifting plate 602, and the second connecting plate 803 is fixedly connected to the surface of the other swing arm 702 on one side of the lifting plate 602. One end of the spring 802 is fixedly connected to the surface of the first connecting plate 801, and the other end of the spring 802 is fixedly connected to the surface of the second connecting plate 803. The spring 802 is stretched when the swing arm 702 swings to increase the pressure of the rolling roller 703 on the membrane and improve the friction.

[0022] In the above embodiment, when the roller 703 presses down and pushes the film outward, the swing arm 702 will open outward. At this time, the spring 802 connected between the two swing arms will be stretched. The stretching of the spring will generate a pull-back force, which will make the swing arm 702 press down the roller 703 more forcefully. This is equivalent to automatically increasing the pressure of the roller on the film. In this way, the friction is greater during the pushing process, making it less likely to slip and pushing more steadily, which is especially suitable for high-gloss films with smooth surfaces.

[0023] refer to Figures 1 to 3As shown, the surfaces of both rolling rollers 703 are covered with a polyurethane layer.

[0024] In the above embodiment, the surface of the roller 703 is covered with a layer of polyurethane material. This material is moderately soft and hard, and will not scratch the film surface or leave indentations. At the same time, it has enough friction to allow the roller to firmly grasp the edge of the film and push it outward. The film will not slip when pushed, and the width can be increased evenly.

[0025] refer to Figures 1 to 3 As shown, cylinder 601 controls the reciprocating motion of lifting plate 602, so that rolling roller 703 pushes the film edge to extend multiple times during each pause, so as to increase the film width to a sufficient extent.

[0026] In the above embodiment, each time the membrane stops, the cylinder 601 does not just press down once, but can control the lifting plate 602 to move up and down several times. Each time it presses down, the rolling roller 703 pushes outward a little, and the membrane width increases a little. This gradual opening in several steps is gentler than pulling it all at once, and it is less likely to tear the membrane. It can achieve more uniform and controllable width adjustment.

[0027] It should be further explained that: the front end of this device is equipped with three sets of longitudinal stretching hot rollers with linear speeds of 5m / min, 6m / min and 7m / min respectively, which are used to continuously stretch the PVC film longitudinally; the hot roller 402 is set in front of the width adjustment station as a set of conveying rollers, driven by stepper motor 401, and adopts an intermittent operation mode, advancing 100mm every 5 seconds and stopping for 3 seconds, so that the rolling assembly can complete the width adjustment operation.

[0028] The working principle of the PVC decorative film production, conveying, and bidirectional stretching device provided by this utility model is as follows: The PVC decorative film is first longitudinally stretched by multiple sets of hot rollers 402 at the front end. The surface of the hot rollers 402 is heated to soften the film. The linear speed of the subsequent set of hot rollers is higher than that of the previous set. Under the action of the speed difference, the film is stretched and thinned along the running direction, completing the longitudinal orientation strengthening. Then the film enters the width adjustment station. A pair of hot rollers 402 driven by motor 401 convey the film intermittently. After each fixed distance, they stop. At this time, cylinder 601 pushes the lifting plate 602 down, and the two side rolling rollers 703 swing outward with the swing arm 702 around the connecting rod 701, synchronously contacting the left and right edges of the film and rolling and pushing it. Under the additional pressure generated by the tension of the spring 802, the rolling roller 703 maintains sufficient friction with the film surface to prevent slippage, gradually increasing the film width. After one widening operation, the cylinder 601 returns, and the motor 401 restarts to transport the next step. This cycle is repeated to achieve continuous step-by-step widening. This process does not require clamps to hold the film edge. The rolling roller 703 with a polyurethane coating is used for flexible pushing, avoiding the rigid contact between the traditional chain clamp and the film edge. This effectively solves the problem of indentation, scratches, or local tearing of the film edge in the prior art, and significantly improves surface quality and yield.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A biaxial stretching device for producing and conveying PVC decorative film, characterized in that, include: Base plate (1); Workbench (2), which is fixedly connected to the surface of base plate (1); Multiple first support frames (3) are fixedly connected to the surface of the base plate (1); The second support frame (5) is fixedly connected to the surface of the workbench (2); The width adjustment mechanism includes a cylinder (601), a lifting plate (602), and two sets of rolling components. The cylinder (601) is fixedly connected to the surface of the second support frame (5), and the lifting plate (602) is fixedly connected to the output shaft of the cylinder (601). Each set of rolling components includes a connecting rod (701), a swing arm (702), and a rolling wheel (703). There are two connecting rods (701) and two swing arms (702). The two swing arms (702) are fixedly connected to the two ends of the lifting plate (602), and one side of each swing arm (702) is rotatably connected to the circumferential surface of the two connecting rods (701). The two ends of the rolling rollers (703) are rotatably connected to the other ends of the two swing arms (702). When the cylinder (601) drives the lifting plate (602) to press down, the two rolling rollers (703) rotate outward with their respective connecting rods (701) as the origin, thereby pushing the film edge to extend and increase the width.

2. The PVC decorative film production conveying bidirectional stretching device according to claim 1, characterized in that, It also includes multiple sets of rolling components, each set of rolling components including a motor (401), a hot roller (402) and a gear (403). There are two hot rollers (402) and two gears (403). The two ends of the two hot rollers (402) are rotatably connected to the first support frame (3). The two gears (403) are respectively fixedly connected to one end of the two hot rollers (402) and the two gears (403) mesh with each other. The motor (401) is fixedly connected to the surface of the first support frame (3) and the output end of the motor (401) is fixedly connected to the other end of one of the hot rollers (402). The motor (401) is an intermittent motor used to control the distance the film advances each time to be the same as the length of the rolling roller (703).

3. The PVC decorative film production conveying bidirectional stretching device according to claim 1, characterized in that, It also includes two sets of pressurizing components. Each set of pressurizing components includes a first connecting plate (801), a spring (802), and a second connecting plate (803). The first connecting plate (801) is fixedly connected to the surface of one of the swing arms (702) on one side of the lifting plate (602), and the second connecting plate (803) is fixedly connected to the surface of the other swing arm (702) on one side of the lifting plate (602). One end of the spring (802) is fixedly connected to the surface of the first connecting plate (801), and the other end of the spring (802) is fixedly connected to the surface of the second connecting plate (803). The spring (802) is stretched when the swing arm (702) swings to increase the pressure of the rolling roller (703) on the membrane and improve the friction.

4. The PVC decorative film production conveying bidirectional stretching device according to claim 2, characterized in that, The surfaces of both rollers (703) are covered with a polyurethane layer.

5. A PVC decorative film production conveying bidirectional stretching device according to claim 2, characterized in that, The cylinder (601) controls the lifting plate (602) to reciprocate, so that the rolling roller (703) pushes the film edge to extend multiple times during each pause, so as to increase the film width to a sufficient extent.

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