Ultrathin film edge strip recovery equipment
By setting up a traction short roller and a gear transmission mechanism in the ultra-thin film edge strip recycling equipment, the traction force is provided to assist the side strips in the suction pipe, which solves the problems of negative pressure instability and sensitivity to negative pressure, and achieves stable recovery of the side strips and reduces disturbances of the film main body.
Patent Information
- Application Number
- CN202422022374.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-20
AI Technical Summary
When recycling the edge strips of ultra-thin films, existing equipment may easily cause the edge strips to be pulled out under the action of large negative pressure, and the negative pressure of the edge suction pipe will disturb the film main body.
An ultra-thin film edge strip recycling device is designed, and a pair of traction short rollers are arranged between the pipe opening of the suction pipe and the downstream guide roller, including a rubber short roller and a brush short roller. The two are rotated in reverse through a gear transmission mechanism, providing traction force to assist the side strips into the suction pipe, while reducing the negative pressure required for the suction pipe.
The traction force provided by the traction short roller and the negative pressure of the exhaust mechanism work together, the tension force of the edge strip when entering the edge suction pipe is reduced, avoiding the edge strip being pulled off, and at the same time reducing disturbance to the film main body.
Smart Images
Figure CN222987106U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plastic production equipment, and particularly relates to a recycling device for ultra-thin film edge strips. Background Art
[0002] Plastic films are generally produced by blow molding or casting extrusion processes. When using the casting extrusion method, the left and right edges of the freshly extruded plastic film will irregularly contract towards the center. Therefore, the thickness of the two edges of the film is relatively thick, and the edges are uneven. Thus, a trimming process is usually required. Similarly, when using the blow molding method, after the formed tubular film is flattened, the two edges need to be cut off to form two film sheets with equal widths. Therefore, a trimming process is also required. The cut-off scraps obtained from the above trimming process are called edge strips, and the edge strips can be recycled online and granulated again.
[0003] The film edge strip recycling device includes an upstream guide roller and a downstream guide roller. The axial direction of the upstream guide roller and the downstream guide roller is called the transverse direction. At the transverse edge positions of the film travel trajectory between the upstream guide roller and the downstream guide roller, there are two cutting knives on the left and right; there are also two suction edge pipes on the left and right. The transverse position of each suction edge pipe matches the transverse position of the corresponding cutting knife. The pipe orifice of the suction edge pipe faces the downstream guide roller; the suction edge pipe is connected to an air extraction mechanism. During operation, the two cutting knives on the left and right continuously cut the film edges to form edge strips. The negative pressure of the suction edge pipe sucks the edge strips into the edge strip pipe. Then, the edge strips are collected for recycling, or the edge strips are directly crushed for recycling.
[0004] When the existing above structure is applied to ordinary films, there are not many problems. However, when the existing above structure is applied to ultra-thin films (ultra-thin films refer to films with a thickness less than 10 microns), there are the following problems: First, the above edge strips completely rely on the negative pressure generated by the air extraction mechanism to suck them into the suction edge pipe. Therefore, the negative pressure value generated by the air extraction mechanism needs to be relatively large, and the negative pressure value generated by the air extraction mechanism is not stable. Moreover, the edge strips of ultra-thin films are very thin. Under the action of a relatively large negative pressure, they are easily broken. Once broken, it may cause the subsequent edge strips to deviate from the pipe orifice of the suction edge pipe and cannot be smoothly sucked in continuously; Second, due to the ultra-thin thickness of ultra-thin films, they are very sensitive to negative pressure. A slight negative pressure will disturb the film. The pipe orifice of the suction edge pipe faces the downstream guide roller, and the negative pressure value of the suction edge pipe is not small. Therefore, it often disturbs the main body of the film (the main body of the film refers to the film between the two tangents on the left and right). Summary of the Utility Model
[0005] The purpose of the utility model is to overcome the above-mentioned drawbacks and provide a recycling device for ultra-thin film edge strips, which can avoid the edge strips from being broken under the action of a relatively large negative pressure.
[0006] Its purpose can be achieved according to the following solution: An ultra-thin film edge strip recycling device includes an upstream guide roller and a downstream guide roller. The axial direction of the upstream guide roller and the downstream guide roller is called the transverse direction. There are two cutting knives, one on the left and one on the right, between the upstream guide roller and the downstream guide roller; There are also two edge suction pipes, one on the left and one on the right. The transverse position of the edge suction pipe on each side matches the transverse position of the corresponding cutting knife, and the pipe orifice of the edge suction pipe faces the downstream guide roller; The edge suction pipe is connected to an air extraction mechanism; It is characterized in that: Between the pipe orifice of each side edge suction pipe and the downstream guide roller, there is also a pair of traction short rollers. Each pair of traction short rollers includes a rubber short roller and a brush short roller. The bristles of the brush short roller are attached to the surface of the rubber short roller. There is a gear transmission mechanism between the rubber short roller and the brush short roller to make their rotation directions opposite; There is also a motor for driving the rubber short roller and the brush short roller to rotate.
[0007] The two edge suction pipes on the left and right are respectively installed on the corresponding pipe supports; There is also a transverse position adjustment mechanism for driving the pipe support and the edge suction pipe to move horizontally. This transverse position adjustment structure includes a handwheel and an adjustment screw rod, and the adjustment screw rod is drivingly connected to the pipe support.
[0008] The present utility model has the following advantages and effects:
[0009] First, when the present utility model works, the air extraction mechanism generates negative pressure at the pipe orifice through the edge suction pipe. At the same time, the motor drives the rubber short roller and the brush short roller to rotate in opposite directions. The edge strip passes through between the rubber short roller and the brush short roller. The rubber short roller and the brush short roller can also provide a certain amount of traction force for the edge strip. The traction force and the negative pressure suction force jointly assist in sending the edge strip into the pipe orifice of the edge suction pipe. Therefore, the negative pressure required by the edge suction pipe can be greatly reduced. In other words, the force for pushing the edge strip into the edge suction pipe is divided into two stages and comes from two parts, thus avoiding the edge strip being broken due to too large a local pulling force.
[0010] Second, the clamping of the rubber short roller and the brush short roller can not only provide a certain amount of traction force but also ensure that the traction force will not be too large to break the edge strip of the ultra-thin film.
[0011] Third, the traction short roller is located between the pipe orifice of the edge suction pipe and the downstream guide roller. In this way, the traction short roller can prevent the negative pressure at the pipe orifice of the edge suction pipe from directly being transmitted face to face to the main body of the film near the downstream guide roller, reducing the disturbance to the main body of the film. Description of the Drawings
[0012] Figure 1 It is a schematic diagram of the overall structure and the use state of inhaling the edge strip of a specific embodiment of the present utility model.
[0013] Figure 2 It is Figure 1 A three-dimensional schematic diagram of the traction short roller assisting in clamping and feeding the edge strip in the structure shown.
[0014] Figure 3 Yes Figure 2 It is a three-dimensional structure schematic diagram after hiding the rubber short roller in the shown structure.
[0015] Figure 4 It is a three-dimensional structure schematic diagram of an overall specific embodiment of the present utility model (hiding the rubber short roller).
[0016] Figure 5 It is a three-dimensional structure schematic diagram of the brush short roller.
[0017] Figure 6 It is a schematic diagram of the cooperation relationship between the brush short roller and the rubber short roller. Specific implementation mode
[0018] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 As shown in Figure 5 and Figure 6 , a kind of ultra-thin film edge strip recycling device includes an upstream guide roller 1 and a downstream guide roller 2. The axial direction of the upstream guide roller 1 and the downstream guide roller 2 is called the transverse direction. There are two cutting knives 3 on the left and right between the upstream guide roller 1 and the downstream guide roller 2; there are also two suction edge pipes 4 on the left and right. The transverse position of each suction edge pipe 4 on one side matches the transverse position of the corresponding cutting knife 3. The pipe orifice 40 of the suction edge pipe 4 faces the downstream guide roller 2; the suction edge pipe 4 is connected with an air extraction mechanism; between the pipe orifice 40 of each suction edge pipe 4 on one side and the downstream guide roller 2, there is also a pair of traction short rollers. Each pair of traction short rollers includes a rubber short roller 5 and a brush short roller 6. The bristles 60 of the brush short roller 6 are attached to the surface of the rubber short roller 5, as Figure 5 、 Figure 6 shown; there is a gear transmission mechanism between the rubber short roller 5 and the brush short roller 6 to make the rotation directions of the rubber short roller 5 and the brush short roller 6 opposite. The gear transmission mechanism includes a first gear 71 and a second gear 72 that mesh with each other. The first gear 71 is coaxially and fixedly connected with the brush short roller 6, and the second gear 72 is coaxially and fixedly connected with the rubber short roller 5; there is also a motor 91 for driving the rotation of the rubber short roller 5 and the brush short roller 6. The motor 91 drives the rubber short roller 5 and the first gear 71 through a belt 9, and the first gear 71 drives the second gear 72 and the rubber short roller 5. The above-mentioned two suction edge pipes 4 on the left and right are respectively installed on the corresponding pipe supports 41; there is also a transverse position adjustment mechanism for driving the transverse movement of the pipe support 41 and the suction edge pipe 4. The transverse position adjustment structure includes a handwheel and an adjustment screw rod 42, and the adjustment screw rod 42 is drivingly connected to the pipe support 41.
[0019] The working principle of the above embodiment is as follows:
[0020] During operation, the left and right cutting knives 3 cut the edges of the film 8 to form a film body 81 and a side strip 80; the air extraction mechanism is started, so that a negative pressure is generated at the pipe orifice 40 through the edge suction pipe 4. At the same time, the motor 91 drives the rubber short roller 5 and the brush short roller 6 to rotate in opposite directions. The side strip 80 passes between the rubber short roller 5 and the brush short roller 6. The rubber short roller 5 and the brush short roller 6 can also provide a part of the traction force for the side strip 80. The traction force and the negative pressure suction assist in feeding the side strip 80 into the pipe orifice 40 of the edge suction pipe. Therefore, the negative pressure required for the edge suction pipe 4 can be greatly reduced.
[0021] When the width of the film 8 changes, the hand wheel and the adjusting screw rod 42 can be used to drive the pipe support 41 and the edge suction pipe 4 to move horizontally, so that the pipe orifice 40 of the edge suction pipe 4 remains aligned with the side strip 80.
Claims
1. An ultra-thin film edge strip recycling device, comprising an upstream guide roller and a downstream guide roller, the axial direction of the upstream guide roller and the downstream guide roller is called the transverse direction, and two left and right cutters are arranged between the upstream guide roller and the downstream guide roller; two left and right edge suction pipes are also arranged, the transverse position of each side edge suction pipe matches the transverse position of the corresponding side cutter, and the pipe opening of the edge suction pipe faces the downstream guide roller; the edge suction pipe is connected to an exhaust mechanism; characterized in that: A pair of traction short rollers is also provided between the pipe opening of each side suction pipe and the downstream guide roller. Each pair of traction short rollers includes a rubber short roller and a brush short roller. The bristles of the brush short roller are attached to the surface of the rubber short roller. A gear transmission mechanism is provided between the rubber short roller and the brush short roller so that the two rotate in opposite directions. A motor is also provided to drive the rubber short roller and the brush short roller to rotate.
2. The ultra-thin film edge strip recycling device according to claim 1, characterized in that: The left and right suction pipes are respectively installed on the pipe supports on the corresponding sides; a lateral position adjustment mechanism is also provided to drive the pipe support and the suction pipe to move lateraly, and the lateral position adjustment mechanism includes a hand wheel and an adjustment screw rod, and the adjustment screw rod drives the connected pipe support.