Leftover material recovery device for winding film production

Abstract

The invention belongs to the technical field of plastic recovery, and discloses a leftover material recovery device for production of a winding film, which comprises a plurality of guide rollers mounted on a portal frame, and further comprises a shearing group and a shearing roller which are mounted on the portal frame, two cutters of the shearing group abut against the peripheral surface of the shearing roller to cut the winding film wound on the shearing roller, and the shearing roller is mounted on the portal frame. Offcut is unloaded from the middle of the shearing set; the guide group, the fixed guide wheel and the rim charge recovery group are arranged at the lower section of the portal frame; and a rim charge film passes through the guide group to the fixed guide wheel, turns towards the rim charge recovery group and is wound on the rim charge recovery group. The rim charge film conveyed downwards by the guide group is wound through the rope winding group I, the rim charge film penetrates through the space between the two light-weight rollers II, the light-weight rollers II clamp and drive the rim charge film to rotate in a self-winding manner, and the rim charge film conveyed in a plane is twisted into one strand, so that the tensile property of the rim charge film is improved. Therefore, the rim charge recycling group can wind the rim charge which is twisted into the rope relatively tightly, and the collection amount of the winding core is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic recycling, and in particular relates to a device for recycling edge material used in the production of stretch films. Background Art

[0002] Stretch film is produced by melting and extruding plastic pellets. The film is then slit into various widths or uniform widths, which are then wound onto cores. Typically, a single extruded film is slit into five smaller sheets, each wound onto a separate core. The cut film scraps are directly wound onto a recycling core, where they are then fed into a crusher to break them into uniform, small pieces for recycling. However, due to the film's low tensile strength, the scraps are carefully wound tightly to prevent breakage. Consequently, the cores are relatively loose, resulting in a low recovery rate per core. For example, publication number CN119116218B discloses a device for recovering scraps for use in stretch film production. The device controls the rotation of a rotary disc by starting a first driving member, so that the scraps of the stretch film rotate with the winding roller to a position close to the shredding roller. As the winding roller pulls out the rotary disc, the rolled stretch film falls onto the shredding roller. The device can effectively reduce the running time of the motor by intermittently starting the shredding roller, thereby reducing the operating energy consumption of the equipment and making it easier for staff to control equipment maintenance and usage costs.

[0003] When this type of claw-knife type crushing roller crushes the stretch film, the film is easily affected by static electricity and adsorbed into clumps, resulting in accumulation at the inlet and outlet, and is easily splashed and adhered to the cavity wall or the crushing roller, reducing the continuous operation time of the crusher.

[0004] The present application proposes a device for recovering edge material from stretch film production to overcome the above-mentioned defects. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a device for recovering edge material for stretch film production.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for recovering scraps for use in stretch film production, comprising a plurality of guide rollers mounted on a gantry, a shearing group and a shearing roller mounted on the gantry, wherein two cutters of the shearing group abut against the circumference of the shearing roller to cut the stretch film passing over the shearing roller, and the scraps are discharged from the middle of the shearing group; It also includes a guide group, a fixed guide wheel and a scrap recovery group arranged at the lower section of the gantry. The scrap film passes through the guide group to the fixed guide wheel and turns to the scrap recovery group and is rolled up in the scrap recovery group. A winding core is provided on one side of the edge material recovery device, and the stretch film cut by the shearing group is finally wound onto the winding core through a guide roller.

[0007] Preferably, a first rope winding group is further provided between the guide group and the fixed guide wheel on the gantry, and the edge film is guided by the guide group into the first rope winding group for winding, and then guided to the fixed guide wheel after passing through the first rope winding group; The rope winding group 1 is driven uniformly by a driver arranged below.

[0008] Preferably, the rope winding group 1 includes a fixing unit 1 fixedly mounted on the gantry, a fixing unit 2 fixedly mounted on the bottom of the fixing unit 1 via a gear ring, and a gear ring rotatably arranged between the fixing unit 1 and the fixing unit 2; A pair of lightweight rollers are provided on the inner side of the gear ring for clamping the edge film.

[0009] Preferably, the rope winding group 1 also includes a slide arranged on the fixed unit 1, the fixed unit 2 and the gear ring, and balls are rolled between the slide on the gear ring and the slides on the fixed unit 1 and the fixed unit 2; a bracket is provided on the inner side of the gear ring, and a pair of waist holes are opened on the bracket, and the center axis of the lightweight roller 2 is installed in the waist hole and can be adjusted along the length direction of the waist hole.

[0010] Preferably, the guide group includes a cantilever fixed on the gantry, and a pair of lightweight rollers are arranged between the cantilevers, wherein one of the lightweight rollers can adjust the distance between itself and the other lightweight roller along a waist hole opened on the cantilever, and the center axes of the two lightweight rollers are elastically connected by a tension spring.

[0011] Preferably, the edge material recovery device is also provided with a drive, which includes a drive motor and a drive roller movably mounted on the gantry, the drive motor is rotatably connected to the drive roller via a pulley, and the drive roller is meshedly connected to the gear ring on each winding group.

[0012] Preferably, two blades are provided at the bottom end of the shearing group, and the distance between the two blades can be adjusted by a spacer.

[0013] Preferably, the circumferential surface of the shearing roller is provided with fine grooves at equal intervals, and the fine grooves can be embedded in the blades at the bottom of the shearing group.

[0014] Preferably, a winding group 2 is provided on the gantry between the fixed guide wheel and the edge material recovery group. The winding group 2 is composed of a winding group 1 and an independent power source for driving the winding group 1. Each strand of edge material film guided by the fixed guide wheel passes through the winding group 1 on the winding group 2 and is then wound up in the edge material recovery group.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses several shearing groups to slit the stretch film, which is then transported to a winding core for rewinding. The cut film scraps are then wound onto a scrap recovery group via a guide group, a rope winding group (1), and a fixed guide pulley. The rope winding group (1) winds the scrap film fed downward by the guide group. The scrap film passes between two lightweight rollers (2), which grip and rotate the film, twisting it into a single strand. This increases the film's tensile strength. The scrap recovery group thus winds the twisted scrap film relatively tightly, increasing the amount collected on the winding core.

[0016] By adding a second winding assembly between the fixed guide wheel and the scrap recovery assembly, this assembly rewinds the multiple strands of scrap film rope that have been guided by the fixed guide wheel, twisting them into a single strand and delivering them to the scrap recovery assembly. This interwoven scrap film rope can significantly reduce the centrifugal effect of the blades, minimize splashing, and reduce static electricity adhesion to the chamber wall. It also prevents the film from clumping and causing channel blockage, reducing downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the edge material recovery mechanism of the present invention; Figure 2 This is a schematic diagram of the structure and position of the guide group, the rope winding group 1 and the fixed guide wheel of the scrap recovery mechanism of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 A schematic diagram showing the function of the first rope winding group and the position of the additional second rope winding group of the present invention; Figure 5 The structure and connection diagram of the driver of the present invention; Figure 6 This is a top view of the structure of the rope winding group 1 of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the rope winding group 1 of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure of part B; Figure 9 It is a structural schematic diagram of the guide group of the present invention; Figure 10 Schematic diagram of the structure of the shearing group of the present invention.

[0018] In the figure: 100, shearing group; 200, shearing roller; 300, guide group; 301, cantilever; 302, lightweight roller 1; 303, center shaft; 304, tension spring; 400, rope winding group 1; 401, fixed unit 1; 402, fixed unit 2; 403, slide; 404, gear ring; 405, bracket; 406, lightweight roller 2; 407, waist hole; 408, ball bearing; 500, fixed guide wheel; 600, winding core; 700, edge material recovery group; 800, drive; 801, driving machine; 802, pulley; 803, driving roller; 900, rope winding group 2. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] The first embodiment, as Figures 1 to 4 As shown, the present invention provides a device for recovering scraps for stretch film production, comprising a plurality of guide rollers mounted on a gantry, and a shearing group 100 and a shearing roller 200 mounted on the gantry. The two cutters of the shearing group 100 abut against the circumference of the shearing roller 200 to cut the stretch film wrapped around the shearing roller 200, and the scraps are unloaded from the middle of the shearing group 100. The machine also includes a guide group 300, a fixed guide wheel 500 and a scrap recovery group 700 arranged at the lower section of the gantry. The scrap film passes through the guide group 300 to the fixed guide wheel 500, turns to the scrap recovery group 700 and is rolled up in the scrap recovery group 700. A winding core 600 is provided on one side of the edge material recovery device, and the stretch film cut by the shearing group 100 is finally wound onto the winding core 600 through a guide roller.

[0021] A rope winding group 1 400 is also provided between the guide group 300 and the fixed guide wheel 500 on the gantry. The edge film is guided by the guide group 300 into the rope winding group 1 400 for winding, and then guided to the fixed guide wheel 500 after passing through the rope winding group 1 400. The rope winding group 1 400 is driven uniformly by a driver 800 disposed below.

[0022] During the stretch film production process, the raw material is extruded through a heated extrusion unit and then flows along guide rollers into an automatic cutting unit. The scrap recovery device in this application is a cutting unit, which cuts the continuously conveyed stretch film into stretch films of equal or different widths through a plurality of shearing groups 100, and then conveys the film to a winding core 600 for winding to form the finished film. The cut scrap film passes through a guide group 300, a rope winding group 400, and a fixed guide wheel 500, and is wound onto the scrap recovery group 700. Several fixed guide wheels 500 are provided below the gantry, and are aligned vertically with the cut scrap film. The scrap film is wound around its circumference and redirected to be conveyed to the scrap recovery group 700.

[0023] like Figure 6-Figure 7 As shown, the rope winding assembly 1 400 includes a fixed unit 1 401 fixed to the gantry, a fixed unit 2 402 fixed to the bottom of the fixed unit 1 401 via a gear ring 404, and a gear ring 404 rotatably disposed between the fixed unit 1 401 and the fixed unit 2 402. A pair of lightweight rollers 2 406 are disposed inside the gear ring 404 for clamping the film scrap. The rope winding assembly 1 400 also includes a slide 403 disposed on the fixed unit 1 401, the fixed unit 2 402, and the gear ring 404. Balls 408 are disposed between the slide 403 on the gear ring 404 and the slides 403 on the fixed unit 1 401 and the fixed unit 2 402. A bracket 405 is disposed inside the gear ring 404, with a pair of waist holes 407 formed in the bracket 405. The central axis of the lightweight roller 2 406 is mounted in the waist holes 407 and can be adjusted along the length of the waist holes 407.

[0024] Winding assembly 1 400 is positioned between guide assembly 300 and fixed guide wheel 500. It winds the film flakes conveyed downward by guide assembly 300. The film flakes pass between two lightweight rollers 2 406, which grip and drive the film flakes to self-wind and rotate, twisting the flat film flakes into a strand and increasing their tensile strength. The film flakes continuously pass between the two lightweight rollers 2 406, which continuously rotate to twist the film flakes. Winding assembly 1 400's rotation mechanism is achieved via a toothed ring 404 located between fixed units 1 401 and 2 402. The teeth of the toothed ring 404 mesh with the driver 800, which drives the flakes. Furthermore, as the film flakes pass through lightweight rollers 2 406, they passively rotate around their axes, eliminating any conveying resistance.

[0025] The top and bottom of the gear ring 404 are respectively matched with the slides on the fixing unit 1 401 and the fixing unit 2 402 through balls, so as to realize free rotation around the central axis. The bracket 405 is provided with a waist hole 407 to adjust the position of the lightweight roller 2 406 along the extension direction of the bracket 405. Figure 7The adjustment method disclosed in the document uses a screw thread on the shaft end and a nut for fixation. Alternatively, elastic adjustment can be used to allow the two lightweight rollers 406 to elastically move closer together, thereby clamping the edge film. One lightweight roller 406 is fixed in position, allowing the other to elastically move along the waist hole. Specific adjustments can be made based on actual conditions by those skilled in the art.

[0026] like Figure 9 As shown, the guide group 300 includes a cantilever 301 fixed on the gantry, and a pair of lightweight rollers 302 are arranged between the cantilevers 301. One of the lightweight rollers 302 can adjust the distance between itself and the other lightweight roller 302 along the waist hole opened on the cantilever 301, and the central axes 303 of the two lightweight rollers 302 are elastically connected by a tension spring 304.

[0027] The guide group 300 is used to isolate the winding of the scrap film from the shear group 100 above, preventing the winding group 400 from rotating too fast, which would affect the scrap film at the shear group 100 above, and avoid pulling the scrap film shearing area. The guide group 300 is installed on the crossbeam in the middle of the gantry via a cantilever 301. Two lightweight rollers 302 are also installed at its end. One lightweight roller 302 is fixed in position, while the other lightweight roller 302 can move in the waist hole. A tension spring 304 is pulled between the two lightweight rollers 302, which always keep them in close contact with each other. Therefore, they can clamp the flat surface of the scrap film, restricting it from twisting. At the same time, it prevents the twisting trend from being transmitted upward, and limits the twisting movement of the scrap film to between the guide group 300 and the winding group 400.

[0028] The lightweight roller 302 can be configured to be hollow inside and covered with a layer of rubber on the surface, so that it can fit tightly without causing excessive resistance.

[0029] like Figure 5 As shown, the driver 800 includes a driving machine 801 and a driving roller 803 movably mounted on the gantry. The driving machine 801 is rotationally connected to the driving roller 803 through a pulley 802, and the driving roller 803 is meshedly connected with the gear ring 404 on each winding group 400.

[0030] A platform is placed at the bottom of the gantry, and a drive motor 801 is fixed to it. A plurality of gears or other components capable of meshing with the gear ring 404 are intermittently arranged on the drive roller 803. The position of each component is adjusted along the length of the drive roller 803. The drive motor 801 drives the drive roller 803 via the pulley 802, thereby driving the rope winding unit 1 400.

[0031] like Figure 10As shown, the bottom end of the shearing assembly 100 is equipped with two blades, and the spacing between the two blades can be adjusted using a spacer. During the production of stretch film, the specifications are determined according to the current different cores. The spacing between the blades is adjusted according to the core model, and the width between the two blades is increased or decreased according to the core width.

[0032] The circumference of the shear roller 200 is provided with fine grooves at equal intervals, and the fine grooves can be embedded in the blades at the bottom of the shear group 100.

[0033] The second embodiment, as Figure 4 As shown, a winding group 2 900 is provided on the gantry between the fixed guide wheel 500 and the scrap recovery group 700. The winding group 2 900 is composed of a winding group 1 400 and an independent power source for driving the winding group 1 400. The scrap film strands guided by each fixed guide wheel 500 pass through the winding group 1 400 on the winding group 2 900 and are then wound up in the scrap recovery group 700.

[0034] In this embodiment, a second rope winding assembly 400 is added between the fixed guide wheel 500 and the scrap recovery assembly 700. This rope winding assembly 400 is used to rewind the scrap rope that has been guided by the fixed guide wheel 500, rewinding multiple strands of scrap film into a single strand and conveying it to the scrap recovery assembly 700. The multiple sets of fixed guide wheels 500 are at the same height, so the scrap film can be twisted into a single strand below the fixed guide wheel 500 and conveyed to the scrap recovery assembly 700. As a result, the scrap recovery assembly 700 winds a single strand of scrap film rope. For subsequent scrap crushing, only the twisted strand of scrap film rope needs to be fed into the crushing device. When the scrap material recovery group 700 is winding, since the scrap material film rope has stronger tensile strength than the scrap material film, the scrap material recovery group 700 can adjust the tightness of the winding when winding, thereby improving the tightness of the winding while ensuring that it does not break. Compared with winding the scrap material film, the winding core can wind a longer scrap material film rope, thereby reducing the frequency of automatic replacement of the winding core.

[0035] The working principle and use process of the present invention: After being extruded through the heated extruder, the raw material follows the guide rollers and passes through the shearing assembly 100 and shearing roller 200 for slitting. The strips are then cut into strips of the same or varying specifications and transported to the winding core 600 for reeling, resulting in the finished film. The cut film scraps are then wound onto the scrap recovery assembly 700 via the guide assembly 300, the rope winding assembly 1 400, and the fixed guide pulley 500. The scraps pass between two lightweight rollers 406, which grip and rotate the scraps, twisting them into a single strand and increasing their tensile strength. The scraps continue to pass between the two lightweight rollers 406, which rotate continuously to twist the scraps as they pass through. The wound edge material rope is then transported to the edge material recovery group 700 for collection via the fixed guide wheel 500. The tensile strength of the edge material film wound into a rope is significantly improved, allowing the edge material recovery group 700 to wrap tightly and increase the collection capacity of a single winding core.

[0036] A rope winding assembly 400 is added between the fixed guide wheel 500 and the scrap recovery assembly 700. This rope winding assembly 400 is used to rewind the scrap rope that has been wound individually from the fixed guide wheel 500, rewinding multiple strands of scrap film into a single strand and conveying it to the scrap recovery assembly 700. The multiple fixed guide wheels 500 are at the same height, so the scrap film can be twisted into a single strand along the bottom of the fixed guide wheel 500 and conveyed to the scrap recovery assembly 700.

[0037] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for recovering scraps from stretch film production, comprising a plurality of guide rollers mounted on a gantry, characterized in that: It also includes a shearing group (100) and a shearing roller (200) installed on the gantry, wherein the two cutters of the shearing group (100) are pressed against the peripheral surface of the shearing roller (200) to cut the stretch film wrapped around the shearing roller (200), and the edge material is unloaded from the middle of the shearing group (100); It also includes a guide group (300), a fixed guide wheel (500) and a scrap recovery group (700) arranged at the lower section of the gantry. The scrap film passes through the guide group (300) to the fixed guide wheel (500), turns to the scrap recovery group (700) and is rolled up in the scrap recovery group (700). A winding core (600) is provided on one side of the edge material recovery device, and the wrapping film cut by the shearing group (100) is finally wound onto the winding core (600) through a guide roller.

2. The device for recovering edge material for stretch film production according to claim 1, characterized in that: A rope winding group 1 (400) is further provided between the guide group (300) and the fixed guide wheel (500) on the gantry. The edge film is guided by the guide group (300) into the rope winding group 1 (400) for winding, and then guided to the fixed guide wheel (500) after passing through the rope winding group 1 (400); The rope winding group 1 (400) is driven uniformly by a driver (800) arranged below.

3. The device for recovering edge material for stretch film production according to claim 2, characterized in that: The rope winding group 1 (400) includes a fixing unit 1 (401) fixed on the gantry, a fixing unit 2 (402) fixed to the bottom of the fixing unit 1 (401) through a gear ring (404), and a gear ring (404) rotatably arranged between the fixing unit 1 (401) and the fixing unit 2 (402); A pair of lightweight rollers (406) are provided on the inner side of the gear ring (404) for clamping the edge film.

4. The device for recovering edge material for stretch film production according to claim 3, characterized in that: The rope winding group 1 (400) further includes a slide (403) arranged on the fixed unit 1 (401), the fixed unit 2 (402) and the gear ring (404), and a ball (408) is arranged to roll between the slide (403) on the gear ring (404) and the slide (403) on the fixed unit 1 (401) and the fixed unit 2 (402); a bracket (405) is arranged on the inner side of the gear ring (404), and a pair of waist holes (407) are opened on the bracket (405), and the central axis of the lightweight roller 2 (406) is installed in the waist hole (407) and can be adjusted along the length direction of the waist hole (407).

5. The device for recovering edge material for stretch film production according to claim 4, characterized in that: The guide group (300) includes a cantilever (301) fixedly mounted on a gantry, and a pair of lightweight rollers (302) are provided between the cantilever (301), wherein the distance between one lightweight roller (302) and the other lightweight roller (302) can be adjusted along a waist hole provided on the cantilever (301), and the central axes (303) of the two lightweight rollers (302) are elastically connected via a tension spring (304).

6. The device for recovering edge material for stretch film production according to claim 3, characterized in that: The edge material recovery device is further provided with a driver (800), the driver (800) comprising a driving machine (801) and a driving roller (803) movably mounted on the gantry, the driving machine (801) being rotationally connected to the driving roller (803) via a pulley (802), and the driving roller (803) being meshedly connected with a gear ring (404) on each winding group (400).

7. A device for recovering edge material for stretch film production according to any one of claims 1 to 7, characterized in that: Two blades are provided at the bottom end of the shearing group (100), and the distance between the two blades can be adjusted by a spacer.

8. A device for recovering edge material for stretch film production according to any one of claims 1 to 7, characterized in that: The circumferential surface of the shearing roller (200) is provided with fine grooves at equal intervals, and the fine grooves can be embedded in the blades at the bottom of the shearing group (100).

9. The device for recovering edge material for stretch film production according to claim 4, characterized in that: A second rope group (900) is provided on the gantry between the fixed guide wheel (500) and the scrap recovery group (700). The second rope group (900) is composed of the first rope group (400) and an independent power source for driving the first rope group (400). Each strand of scrap film guided by the fixed guide wheel (500) passes through the first rope group (400) on the second rope group (900) and is then wound up in the scrap recovery group (700).

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