Plastic film scrap melting device

Abstract

The utility model discloses a kind of plastic film edge angle material melting devices, comprising: breaker, breaker includes broken frame and two groups of broken shaft, two groups of broken shaft are rotatably connected in the inner wall of broken frame, a plurality of groups of broken teeth and engagement groove are provided on broken shaft, the broken tooth of one group of broken shaft is matched with the engagement groove of another group of broken shaft, wherein, the shape of broken tooth is cylindrical gear structure, broken tooth profile is involute shape, broken tooth has tooth top circle, dedendum circle and the involute tooth side surface of connecting both, multiple gear teeth are sequentially arranged along the axial direction of broken shaft. The plastic film edge angle material melting device of the utility model can effectively reduce the phenomenon of plastic film edge angle material winding around the shaft, make the processing process more smooth, reduce the frequency of shutdown cleaning caused by winding, improve the overall processing efficiency and stability, and ensure continuous operation.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic film recycling, and in particular to a device for melting plastic film scraps. Background Technology

[0002] Plastic film scraps are byproducts that are inevitably generated in the plastic film production process. They mainly originate from the cutting, slitting, and trimming processes after film forming. For example, the regular cutting of the film roll edges in the blown film process, the removal of excess material edges after printing or lamination processes, and the crushing of defective products. They are mostly long strips, irregular fragments, or rolls of scrap, and the materials cover common plastic film types such as PE, PP, and PVC.

[0003] In the large-scale production of plastic film, the amount of such scraps can reach 5% to 15% of the total output, which will lead to resource waste if not recycled in time. However, due to its thinness, high ductility and toughness, it is very easy for it to become entangled on the crushing shaft when it enters the crushing equipment during traditional recycling processes, forming a "shaft-entangled material" phenomenon. This not only causes the crushing equipment to jam and stop, but also requires frequent manual cleaning, seriously disrupting the continuous production process, significantly reducing recycling efficiency, and increasing labor costs and equipment wear and tear risks. Utility Model Content

[0004] This utility model aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, the purpose of this utility model is to propose a plastic film scrap melting device, which can effectively reduce the phenomenon of plastic film scraps winding around the shaft, make the processing smoother, reduce the frequency of downtime cleaning caused by entanglement, improve the overall processing efficiency and stability, and ensure continuous operation.

[0006] To achieve the above objectives, this utility model proposes a plastic film scrap melting device, comprising: a crusher, the crusher including a crushing frame and two sets of crushing shafts, the two sets of crushing shafts being rotatably connected to the inner wall of the crushing frame, the crushing shafts being provided with multiple sets of meshing teeth and meshing grooves, the meshing teeth of one set of crushing shafts engaging with the meshing grooves of the other set of crushing shafts, wherein the shape of the meshing teeth is a cylindrical gear structure, the tooth profile of the meshing teeth is involute, the meshing teeth have a tooth tip circle, a tooth root circle, and an involute tooth side surface connecting the two, the multiple gear teeth are arranged sequentially along the axial direction of the crushing shafts to form multiple sets of meshing tooth structures; a pelletizing device, the feed inlet of the pelletizing device being located at the discharge outlet of the crusher, the pelletizing device being provided with a heating device; and a support frame, the support frame being used to support the crusher and the pelletizing device.

[0007] The plastic film scrap melting device of this invention can effectively reduce the phenomenon of plastic film scraps winding around the shaft, making the processing smoother, reducing the frequency of downtime for cleaning due to entanglement, improving the overall processing efficiency and stability, and ensuring continuous operation.

[0008] In addition, the plastic film scrap melting device proposed in the above application may also have the following additional technical features: Specifically, the grinding teeth are rotating structures, and their axial cross-sectional profile is composed of multiple tangent circular arcs; The radial cross-section of the crushing tooth is elliptical in shape.

[0009] Specifically, the surface of the grinding teeth is covered with micro-protrusions.

[0010] Specifically, the end of the crushing shaft is connected to a gear, and two sets of gears are meshed together. It also includes a drive device, the output end of which is connected to one of the sets of crushing shafts.

[0011] Specifically, the pelletizing device includes a pelletizing cylinder, a helical blade shaft, and an extrusion head. The helical blade shaft is rotatably connected to the pelletizing cylinder. The extrusion head is provided with multiple sets of extrusion holes and is located at the discharge port of the pelletizing cylinder. A pelletizing motor is provided outside the pelletizing cylinder, and the output end of the pelletizing motor is connected to the helical blade shaft.

[0012] Specifically, the bottom plate of the crushing frame is an inclined surface, with its inclination angle facing the pelletizing device.

[0013] Specifically, the extrusion cylinder has a double-layer structure, and a heating wire is installed inside the double-layer structure.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the plastic film scrap melting device of this utility model; Figure 2 This is a schematic diagram of the crusher structure in the plastic film scrap melting device of this utility model; Figure 3 This is a schematic diagram of the two sets of shafts in the plastic film scrap melting device of this utility model; Figure 4 This is a schematic diagram of the spiral blade shaft and extruder head structure in the plastic film scrap melting device of this utility model.

[0016] As shown in the figure: 1. Crusher; 2. Shaft gear; 3. Extrusion cylinder; 4. Support frame; 5. Drive device; 6. Crushing frame; 7. Crushing shaft; 8. Gear; 9. Gear; 10. Meshing groove; 11. Spiral blade shaft; 12. Extrusion head. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. Rather, the embodiments of the present invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0018] The following description, in conjunction with the accompanying drawings, describes the plastic film scrap melting device according to an embodiment of the present invention.

[0019] like Figures 1-4 As shown, the plastic film scrap melting device of this utility model embodiment includes: The crusher 1 includes a crushing frame 6 and two sets of crushing shafts 7. The two sets of crushing shafts 7 are rotatably connected to the inner wall of the crushing frame 6. Multiple sets of meshing teeth 8 and meshing grooves 10 are provided on the crushing shafts 7. The meshing teeth 8 of one set of crushing shafts 7 engage with the meshing grooves 10 of the other set of crushing shafts 7. The crushing shafts 7 and the meshing teeth 8 form a set of shaft gear components 2. The shape of the crushing tooth 8 is a cylindrical gear 9 structure. The tooth profile of the crushing tooth 8 is involute. The crushing tooth 8 has a tooth tip circle, a tooth root circle, and an involute tooth side connecting the two. Multiple gear 9 teeth are arranged sequentially along the crushing shaft 7 to form multiple sets of crushing tooth 8 structures.

[0020] The gear 9 employs a typical involute tooth profile, enabling the meshing teeth 8 of the two sets of crushing shafts 7 to engage with the meshing grooves 10 in a continuous, impact-free meshing motion, conforming to the "constant instantaneous transmission ratio" characteristic of involute gears 9. When the crushing shafts 7 rotate, the tooth surface contact points slide along the involute trajectory, resulting in a uniform distribution of shear force and avoiding localized stress concentration. This improves the continuity and stability of plastic film crushing while reducing the wear rate of the meshing teeth 8.

[0021] The pelletizing device has its feed inlet located at the discharge outlet of the crusher 1, and a heating device is installed inside the pelletizing device.

[0022] Support frame 4 is used to support crusher 1 and pelletizing device.

[0023] Specifically, scrap plastic film is fed into the feed inlet of the crusher 1 via a feeding conveyor and falls between two sets of counter-rotating crushing shafts 7. Because the meshing teeth 8 of one set of crushing shafts 7 and the meshing grooves 10 of the other set are in an alternating fit, when the plastic film enters the crushing zone, it is first subjected to the shearing action of the involute tooth profile. The involute tooth profile provides a constant transmission ratio, ensuring uniform and stable shearing force.

[0024] The crushed plastic granules fall into the feed inlet of the extrusion device by gravity and move towards the die head under the push of the rotating screw. The material first passes through the feeding section, which has a lower temperature and mainly serves a conveying function. As the material moves towards the melting section, the temperature gradually rises, and the plastic granules begin to soften and melt.

[0025] In the melting section, the screw compression ratio gradually increases, applying high pressure to the material. Simultaneously, the threaded guide grooves on the inner wall of the barrel induce radial flow in the material, enhancing the mixing and plasticizing effect. The homogenization section maintains a temperature 5-10°C above the plastic's melting point, further homogenizing the material's temperature and viscosity.

[0026] Molten plastic is extruded through small holes in the die head template, forming multiple continuous filaments. A rotating cutter cuts the filaments at a set speed, forming uniform granules. During the pelletizing process, the granules are cooled and shaped using either air or water cooling. Finally, the qualified plastic granules are conveyed to a storage device via a conveyor belt.

[0027] In one embodiment of this utility model, the meshing tooth 8 is a rotating body structure, and its axial cross-sectional profile is composed of multiple tangent circular arcs.

[0028] The radial cross-section of the crushing tooth 8 is elliptical in shape.

[0029] Specifically, the cutting edge along the major axis of the ellipse is sharper and has a smaller radius of curvature, which is beneficial for initial entry. This allows the crushing teeth 8 to form a "wave-shaped" shearing edge in the axial direction. Compared with a straight cutting edge, this increases the contact points with the plastic film, creating a "point-line-surface" composite crushing effect during rotation. This is especially suitable for processing plastic films of different thicknesses and toughnesses, such as single-layer films and composite films, thus improving crushing efficiency.

[0030] In one embodiment of this utility model, the surface of the crushing tooth 8 is distributed with micro-protrusions.

[0031] Specifically, the gaps between the micro-protrusions can accommodate the small debris generated during the crushing process, preventing debris from accumulating on the tooth surface and causing "tooth jamming".

[0032] In one embodiment of the present invention, a gear 9 is connected to the end of the crushing shaft 7, and two sets of gears 9 are meshed together. The invention also includes a driving device 5, the output end of which is connected to one of the sets of crushing shafts 7.

[0033] Specifically, the drive device 5 directly drives a set of crushing shafts 7 through its output end. The gear 9 at the end of the shaft meshes with the gear 9 at the end of another set of crushing shafts 7, so that the two sets of crushing shafts 7 rotate in opposite directions.

[0034] In one embodiment of the present invention, the pelletizing device includes a pelletizing cylinder 3, a helical blade shaft 11, and an extrusion head 12. The helical blade shaft 11 is rotatably connected to the pelletizing cylinder 3. The extrusion head 12 is provided with multiple sets of extrusion holes and is located at the discharge port of the pelletizing cylinder 3. A pelletizing motor is provided outside the pelletizing cylinder 3, and the output end of the pelletizing motor is connected to the helical blade shaft 11.

[0035] The extrusion motor drives the spiral blade shaft 11 to rotate, propelling the crushed plastic granules within the extrusion cylinder 3. Heating wires inside the double-layer cylinder heat up, causing the granules to gradually melt and plasticize.

[0036] In one embodiment of this utility model, the bottom plate of the crushing frame 6 is an inclined surface, and its inclination angle is towards the pelletizing device.

[0037] Specifically, the inclined base plate guides the crushed plastic particles to slide towards the pelletizing device by gravity.

[0038] In one embodiment of this utility model, the pelletizing cylinder 3 has a double-layer structure, and a heating wire is provided inside the double-layer structure.

[0039] The molten material is pushed to the extrusion head 12 by the spiral blade shaft 11 and forms a continuous strip through multiple sets of extrusion holes.

[0040] Specifically, in actual operation, plastic film scraps are conveyed into the crusher 1. Two sets of counter-rotating crushing shafts 7, with their involute teeth 8 and meshing grooves 10, shear the material in an alternating manner. Combined with the rotating structure and micro-protrusion design, the material is efficiently crushed into granules. The granules fall into the extrusion device through the inclined bottom plate and are melted and plasticized under the heating wire of the double-layer extrusion cylinder 3. The spiral blade shaft 11 pushes the material through multiple holes in the extrusion head 12 to form strips. After cooling and shaping by the cutter, recycled granules are output.

[0041] In summary, the plastic film scrap melting device of this utility model can effectively reduce the phenomenon of plastic film scraps winding around the shaft, making the processing smoother, reducing the frequency of downtime for cleaning due to entanglement, improving the overall processing efficiency and stability, and ensuring continuous operation.

[0042] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A device for melting plastic film scraps, characterized in that, include: A crusher (1) includes a crushing frame (6) and two sets of crushing shafts (7). The two sets of crushing shafts (7) are rotatably connected to the inner wall of the crushing frame (6). Each crushing shaft (7) is provided with multiple sets of meshing teeth (8) and meshing grooves (10). The meshing teeth (8) of one set of crushing shafts (7) engage with the meshing grooves (10) of the other set of crushing shafts (7). The shape of the crushing tooth (8) is a cylindrical gear (9) structure. The tooth profile of the crushing tooth (8) is involute. The crushing tooth (8) has a tooth tip circle, a tooth root circle and an involute tooth side surface connecting the two. Multiple gear (9) teeth are arranged sequentially along the crushing shaft (7) to form multiple sets of crushing tooth (8) structures. The pelletizing device has its feed inlet located at the discharge outlet of the crusher (1) and is equipped with a heating device. Support frame (4) is used to support the crusher (1) and the pelletizing device.

2. The plastic film scrap melting device according to claim 1, characterized in that, The grinding tooth (8) is a rotating body structure, and its axial cross-sectional profile is composed of multiple tangent circular arcs; The radial cross-section of the crushing tooth (8) is elliptical.

3. The plastic film scrap melting device according to claim 1, characterized in that, The surface of the crushing tooth (8) is covered with micro-protrusions.

4. The plastic film scrap melting device according to claim 1, characterized in that, The crushing shaft (7) is connected to a gear (9) at its end, and two sets of gears (9) are meshed together. The shaft also includes a drive device (5), the output end of which is connected to one of the crushing shafts (7).

5. The plastic film scrap melting device according to claim 1, characterized in that, The pelletizing device includes a pelletizing cylinder (3), a spiral blade shaft (11), and an extrusion head (12). The spiral blade shaft (11) is rotatably connected to the pelletizing cylinder (3). The extrusion head (12) is provided with multiple sets of extrusion holes. The extrusion head (12) is located at the discharge port of the pelletizing cylinder (3). A pelletizing motor is provided outside the pelletizing cylinder (3). The output end of the pelletizing motor is connected to the spiral blade shaft (11).

6. The plastic film scrap melting device according to claim 1, characterized in that, The bottom plate of the crushing frame (6) is an inclined surface, and its inclination angle is towards the pelletizing device.

7. The plastic film scrap melting device according to claim 5, characterized in that, The extrusion cylinder (3) has a double-layer structure, and a heating wire is provided inside the double-layer structure.

Images