CN112571752A

CN112571752A - Plastic extrusion device for multilayer co-extruded film

Info

Publication number: CN112571752A
Application number: CN202011440041.4A
Authority: CN
Inventors: 张春华; 秦志红; 白汝佳; 杨丁卯
Original assignee: Guangdong Simcheng Plastics Machinery Co Ltd
Current assignee: Guangdong Simcheng Plastics Machinery Co Ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-03-30
Also published as: WO2022122045A1

Abstract

The invention discloses a plastic extrusion device for a multilayer co-extruded film, which comprises a blanking mechanism, a melting mechanism, a co-extrusion composite distributor, a co-extrusion die head, a rack platform and a gantry frame body, wherein the blanking mechanism is arranged on the frame platform; through sliding the base and setting up on rack platform, make the melt mechanism can relative slip on rack platform, consequently when whole melt mechanism expend with heat and contract with cold, can expand and contract on rack platform to reduce the stress of melt mechanism. The output end of the melting mechanism is connected with the feed end of the co-extrusion composite distributor through the metal hose, so that the distance between the co-extrusion composite distributor and the melting mechanism is variable, and the stress of expansion with heat and contraction with cold of the melting mechanism is effectively prevented from being transmitted to the co-extrusion composite distributor. In addition, because the distance between the co-extrusion composite distributor and the melting mechanism is variable, the co-extrusion die head is hung in front of the rack platform through the linearly moving suspension arm, so that the co-extrusion die head can move back and forth relative to the rack platform, and the position of the extruded raw material of the co-extrusion die head can be conveniently adjusted.

Description

Plastic extrusion device for multilayer co-extruded film

Technical Field

The invention relates to the technical field of film production equipment, in particular to a plastic extrusion device for a multilayer co-extrusion film.

Background

In the multilayer co-extrusion film production line, plastic particles are firstly put into a melting mechanism through a blanking mechanism, the plastic particles are melted into plastic slurry in the melting mechanism, the plastic slurry flows from the melting mechanism to a co-extrusion composite distributor to be compounded into composite melt with a multilayer structure, and then the composite melt is extruded from a co-extrusion die head. In the prior art, the position relationship between the mechanisms is fixed, so that the expansion and contraction of the melting mechanism are difficult to realize during working, the excessive stress of the melting mechanism is easy to cause deformation, the normal operation of a multilayer co-extrusion film production line is influenced, and the position of the extrusion raw material of the co-extrusion die head is not easy to adjust.

Disclosure of Invention

Aiming at the defects, the invention aims to provide a plastic extrusion device for a multilayer co-extrusion film, which solves the technical problems that the existing plastic extrusion device has overlarge stress and the position of an extrusion raw material of a co-extrusion die head is difficult to adjust.

In order to achieve the purpose, the invention adopts the following technical scheme: a plastic extrusion device for multilayer co-extrusion films comprises a blanking mechanism, a melting mechanism, a co-extrusion composite distributor, a co-extrusion die head, a rack platform and a gantry frame body; the melting mechanism is provided with a base; a linear moving suspension arm which slides back and forth is arranged on the gantry frame body; the base is arranged on the stand platform in a sliding manner, and the sliding direction of the base is parallel to the length direction of the melting mechanism; the gantry frame body is arranged in front of the rack platform, the co-extrusion die head is fixedly connected with the linear moving suspension arm, and the co-extrusion composite distributor is arranged on the co-extrusion die head; the discharging end of the discharging mechanism is communicated to the feeding end of the melting mechanism to form a raw material melting unit, the output ends of the melting mechanism in the raw material melting units are communicated to the feeding end of the co-extrusion composite distributor through metal hoses respectively, and the discharging end of the co-extrusion composite distributor is communicated to the feeding end of the co-extrusion die head.

Further, the linear moving suspension arm comprises a sliding seat, an adjusting frame and a suspension plate; the sliding seat is linearly and slidably arranged on the gantry frame body; the adjusting frame is connected with the bottom pin of the sliding seat in a left-right sliding manner; the hanging plate is arranged at the bottom of the adjusting frame in a vertically sliding manner; the hanger plates in the two linear moving hanger arms are respectively and fixedly connected with the two ends of the co-extrusion die head.

Furthermore, the adjusting frame is provided with an adjusting hole and an adjusting nut, and the adjusting nut is positioned in the adjusting hole; the top of hanger plate is equipped with the adjusting screw bolt, and the top of adjusting screw bolt is worn to establish to adjusting hole and adjusting nut screw-thread fit from the bottom of alignment jig.

Further, the metal hose is provided with a heating element and heat preservation covers, the heating element is arranged on the periphery of the metal hose in a surrounding mode, and the heat preservation covers are arranged on the periphery of the heating element in a covering mode in a segmented mode.

Further, the base is provided with a roller, the rack platform is provided with a guide rail, the slide rail extends along the length direction of the melting mechanism, and the roller is in sliding fit with the guide rail.

Further, the material melting mechanism comprises a heating pipeline, the heating pipeline is provided with a feeding hole, a water-cooling hopper seat is arranged on the periphery of the heating pipeline, and the blanking mechanism is arranged on the water-cooling hopper seat; the water-cooling hopper seat is provided with a feed opening, an installation cavity and a cold water chamber; the feed opening is communicated to the inside of the mounting cavity; the installation cavity is sleeved on the periphery of the heating pipeline, and the feed opening is connected with the feed inlet; the cold water chamber is arranged on the periphery of the mounting cavity in a surrounding manner; the discharging end of the discharging mechanism is communicated to the discharging opening.

Further, the blanking mechanism comprises an outer hopper component for throwing plastic particles and an inner hopper component for throwing plastic film rim charge, and the outer hopper component comprises a suction hopper and an outer hopper; the inner hopper component comprises a cyclone separator, a discharging screw rod and an inner hopper; the inner hopper is arranged inside the outer hopper; the suction hopper is used for sucking plastic particles into the outer hopper; the cyclone separator is used for introducing the casting film rim charge into the inner hopper; the discharging screw rod is rotationally arranged inside the inner hopper; the discharge end of outer hopper communicates to the installation cavity through the feed opening, and the discharge end of interior hopper wears out and communicates to the installation cavity from the discharge end of outer hopper.

Further, the outer hopper assembly further comprises a bifurcated hopper; the fork-shaped hopper is provided with a plurality of discharge ends; the discharge end of the suction hopper is communicated to the feed end of the forked hopper; a plurality of discharge ends of the forked type hopper are uniformly arranged on the outer wall of the outer hopper and communicated to the inside of the outer hopper.

The material melting mechanism further comprises a material pushing screw rod, the material pushing screw rod is rotatably arranged in the heating pipeline in a penetrating mode, and the material pushing screw rod is sequentially provided with a feeding section, a compression section and a metering section along the axial direction; the feed section has a first thread and a first helical groove; the compression section is provided with a second thread and a second spiral groove, and the second thread is provided with a third spiral groove; the metering section has a third thread and a fourth helical groove; the turning directions of the first thread, the second thread and the third thread are the same, the tail end of the first thread is connected with the starting end of the second thread, and the tail end of the second thread is connected with the starting end of the third thread; the tail end of the first spiral groove is connected with the starting end of the second spiral groove, and the tail end of the third spiral groove is connected with the starting end of the fourth spiral groove; the rod body of the compression section has a taper, the diameter of the rod body at the starting end of the compression section is smaller than that at the terminal end of the compression section, the groove width of the second spiral groove gradually changes to zero from the starting end of the compression section to the terminal end of the compression section, and the groove depth of the second spiral groove gradually changes to zero from the starting end of the compression section to the terminal end of the compression section.

Further, the middle part of measurement district section still is equipped with protective screen portion, and protective screen portion is equipped with a plurality of fourth screw threads, feeding helicla flute and ejection of compact helicla flute, and the fourth screw thread is the same with the turning of first screw thread, and the groove depth of feeding helicla flute gradually changes to zero from the feed end to the discharge end, and the groove depth of ejection of compact helicla flute gradually changes to zero from the discharge end to pan feeding end.

In the invention, the base is arranged on the rack platform in a sliding manner, so that the melting mechanism can slide on the rack platform relatively, and therefore, when the whole melting mechanism expands with heat and contracts with cold, the melting mechanism can expand and contract on the rack platform, so as to reduce the stress of the melting mechanism. Furthermore, the output end of the melting mechanism is connected with the feed end of the co-extrusion composite distributor through a metal hose, and the deformable characteristic of the metal hose is utilized, so that the metal hose can be bent in the thermal expansion process of the melting mechanism, and the reduction of the distance between the co-extrusion composite distributor and the melting mechanism is realized. When the melting mechanism is in the cold contraction process, the metal hose can be opened, and the distance between the co-extrusion composite distributor and the melting mechanism is enlarged. The metal hose can make corresponding deformation according to actual conditions promptly, makes the interval between crowded composite distributor altogether and the melt mechanism variable, effectively avoids the stress transmission of the expend with heat and contract with cold of melt mechanism to crowd composite distributor altogether. In addition, because the distance between the co-extrusion composite distributor and the melting mechanism is variable, the co-extrusion die head is hung in front of the rack platform through the linearly moving suspension arm, so that the co-extrusion die head can move back and forth relative to the rack platform, and the position of the extruded raw material of the co-extrusion die head can be conveniently adjusted.

Drawings

FIG. 1 is a schematic block diagram of one embodiment of the present invention;

FIG. 2 is a schematic diagram of a linearly moving boom of an embodiment of the present invention;

FIG. 3 is a schematic structural view of a melt mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a water-cooled bucket seat according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a water-cooled bucket seat according to an embodiment of the present invention;

FIG. 6 is a schematic view of a middle section of a blanking mechanism according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a pusher screw according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1 to 7, a plastic extrusion device for a multilayer co-extrusion film comprises a blanking mechanism 100, a melting mechanism 200, a co-extrusion composite distributor 300, a co-extrusion die head 400, a frame platform 500 and a gantry 600. The melt mechanism 200 has a base 210, and in particular, the base 210 is used to carry the remaining components of the melt mechanism 200. The gantry body 600 is provided with a linearly moving boom 610 that slides back and forth. The base 210 is slidably disposed on the rack platform 500, and a sliding direction of the base 210 is parallel to a length direction of the melting mechanism 200. The gantry 600 is disposed in front of the gantry platform 500, the co-extrusion die head 400 is fixedly connected with the linearly moving boom 610, and the co-extrusion composite distributor 300 is installed on the co-extrusion die head 400. The discharging end of the blanking mechanism 100 is communicated to the feeding end of the melting mechanism 200 to form a raw material melting unit, the output end of the melting mechanism 200 in the raw material melting units is communicated to the feeding end of the co-extrusion composite distributor 300 through the metal hose 310, and the discharging end of the co-extrusion composite distributor 300 is communicated to the feeding end of the co-extrusion die head 400. Specifically, after the blanking mechanism 100 puts the material into the melting mechanism 200, the melting mechanism 200 melts the material and transmits the material to the co-extrusion composite distributor 300, and the co-extrusion composite distributor 300 compounds the material in the molten state into a composite melt with a multilayer structure, and transmits the composite melt to the co-extrusion die head 400 for extrusion.

In the present invention, the base 210 is slidably disposed on the frame platform 500, so that the melting mechanism 200 can slide on the frame platform 500, and when the whole melting mechanism 200 expands with heat and contracts with cold, the melting mechanism can expand and contract on the frame platform 500, so as to reduce the stress of the melting mechanism 200. Further, the output end of the melting mechanism 200 is connected to the input end of the co-extrusion composite distributor 300 through the metal hose 310, and the metal hose 310 is deformable, so that when the melting mechanism 200 is in a thermal expansion process, the metal hose 310 can be bent, and the distance between the co-extrusion composite distributor 300 and the melting mechanism 200 is reduced. When the melting mechanism 200 is shrinking, the metal hose 310 can be opened, so that the distance between the co-extrusion composite distributor 300 and the melting mechanism 200 is increased. That is, the metal hose 310 can deform correspondingly according to the actual situation, so that the distance between the co-extrusion composite distributor 300 and the melt mechanism 200 is variable, and the stress of expansion with heat and contraction with cold of the melt mechanism 200 is effectively prevented from being transmitted to the co-extrusion composite distributor 300. In addition, since the distance between the co-extrusion composite distributor 300 and the melting mechanism 200 is variable, the co-extrusion die head 400 is hung in front of the rack platform 500 by the linearly moving suspension arm 610, so that the co-extrusion die head 400 can move back and forth relative to the rack platform 500, and the position of the co-extrusion die head 400 for extruding raw materials can be conveniently adjusted.

Specifically, linearly moving boom 610 includes a slide 611, an adjustment bracket 612, and a boom plate 613. The carriage 611 is linearly slidably disposed on the gantry body 600. The adjusting bracket 612 is pin-connected with the bottom of the sliding seat 611 in a left-right sliding manner. The hanging plate 613 is slidably disposed up and down at the bottom of the adjusting bracket 612. The hanging plates 613 of the two linearly moving hanging arms 610 are respectively fixedly connected with both ends of the co-extrusion die head 400. As shown in FIG. 2, the height of the co-extrusion die 400 is adjusted up and down by slidably disposing the hanging plate 613 up and down at the bottom of the adjusting frame 612. The adjusting frame 612 is connected with the bottom pin of the sliding seat 611 in a left-right sliding manner, so that the two ends of the co-extrusion die head 400 can move left and right relatively, therefore, when the co-extrusion die head 400 expands with heat and contracts with cold, the two ends of the co-extrusion die head 400 can extend and retract respectively, and the co-extrusion die head 400 is prevented from being deformed due to overlarge stress. It should be noted that, in some embodiments, the gantry 600 is provided with a linear moving module, and the sliding base 611 is fixed at a moving end of the linear moving module, so that the linearly moving boom 610 can linearly slide on the gantry 600, and further the co-extrusion die head 400 can be driven to move back and forth.

Further, the adjusting bracket 612 is provided with an adjusting hole 614 and an adjusting nut 615, and the adjusting nut 615 is located in the adjusting hole 614. An adjusting stud 616 is arranged at the top of the hanging plate 613, and the top end of the adjusting stud 616 penetrates into the adjusting hole 614 from the bottom of the adjusting frame 612 to be in threaded fit with the adjusting nut 615. As shown in fig. 2, when the top of the adjusting stud 616 is inserted into the adjusting hole 614 and then is in threaded fit with the adjusting nut 615, the hanging plate 613 is clamped at the bottom of the adjusting frame 612. The adjusting hole 614 is used for a worker to screw the adjusting nut 615, and the lifting plate 613 can be adjusted to ascend or descend by screwing the adjusting nut 615, so that the height position of the front die assembly or the rear die assembly in the co-extrusion die head 400 can be adjusted.

Preferably, in some embodiments, the metal hose 310 is provided with a heating element circumferentially disposed on the outer circumference of the metal hose 310 and a plurality of heat-insulating covers sectionally disposed on the outer circumference of the heating element. Specifically, in the process that the raw material in the molten state enters the co-extrusion composite distributor 300 through the metal hose 310, the heating element generates heat to keep the temperature of the raw material, so that the temperature of the raw material is kept unchanged, and the raw material is favorably compounded in the co-extrusion composite distributor 300. The plurality of heat preservation cover bodies are covered on the periphery of the heating element in a segmented mode, so that heat loss is reduced, and the heat preservation cover bodies are arranged on the periphery of the metal hose 310 in a segmented mode, so that the heat preservation cover bodies are prevented from damaging the flexibility of the metal hose 310. Wherein, the heating element can be a ceramic heating plate or an electric heating ring.

It should be noted that the base 210 is provided with rollers, the rack platform 500 is provided with guide rails, the slide rails extend along the length direction of the melting mechanism 200, and the rollers are slidably engaged with the guide rails. Through the sliding fit between the rollers and the guide rails, the base 210 can slide on the rack platform 500. The rolling friction is adopted between the base 210 and the rack platform 500, so that the friction force between the base 210 and the rack platform 500 is greatly reduced, the expansion caused by heat and the contraction caused by cold of the melting mechanism 200 on the rack platform 500 are facilitated, and the stress of the melting mechanism 200 is reduced.

Specifically, referring to fig. 3 to 5, the melting mechanism 200 includes a heating pipe 220, the heating pipe 220 is provided with a feeding port 221, a water-cooled hopper seat 230 is provided on the outer periphery of the heating pipe 220, and the blanking mechanism 100 is installed on the water-cooled hopper seat 230. The water-cooled hopper base 230 has a feed opening 231, a mounting cavity 232, and a cold water chamber 233. The feed opening 231 communicates with the inside of the installation cavity 232. The installation cavity 232 is sleeved on the periphery of the heating pipeline 220 to realize installation and fixation of the water-cooling hopper seat 230, and the feed opening 231 is connected with the feed opening 221 so as to realize that the material of the blanking mechanism 100 can be put into the heating pipeline 220. The cold water chamber 233 is circumferentially provided at the outer circumference of the installation cavity 232. The discharging end of the discharging mechanism 100 is communicated to the discharging port 231. Through set up cold water chamber 233 in the periphery of installation cavity 232 with encircling, realize wrapping up installation cavity 232, utilize cold water chamber 233 to load cold water in order to reduce the heat transfer of heating pipeline 220 to unloading mechanism 100, avoid the material in unloading mechanism 100 to melt and produce the adhesion resistance and reduce unloading efficiency. Further, the water-cooling hopper base 230 includes a first hollow shell 234 and a second hollow shell 235, and the first hollow shell 234 covers the second hollow shell 235 to form the cylindrical water-cooling hopper base 230. As shown in fig. 4 and 5, the first hollow shell 234 and the second hollow shell 235 are respectively in a semicircular arc shape, and are covered on the second hollow shell 235 through the first hollow shell 234 to form a cylindrical water-cooling hopper seat 230, the hollow parts of the first hollow shell 234 and the second hollow shell 235 are cold water chambers 233, the hollow part of the water-cooling hopper seat 230 is an installation cavity 232, and the water-cooling hopper seat 230 is arranged in a cylindrical shape to reduce corners, so that cold water in the cold water chambers 233 can flow conveniently. Further, the first hollow housing 234 is provided with a first cold water input port 2341 and a first cold water output port 2342, and the second hollow housing 235 is provided with a second cold water input port 2351 and a second cold water output port 2352. The first cold water input port 2341 is used to introduce cold water into the interior of the first hollow housing 234, and the first cold water output port 2342 is connected to the second cold water input port 2351 through a connection hose, so that the first hollow housing 234 communicates with the second hollow housing 235. The second cold water output 2352 is used for drawing out cold water of the second hollow housing 235. In the water-cooled hopper holder 230, the external cold water flows into the hollow portion of the first hollow housing 234 from the first cold water input port 2341, then flows into the second cold water input port 2351 from the first cold water input port 2341, so that the cold water flows into the hollow portion of the second hollow housing 235, and then is discharged from the second cold water output port 2352, so that the cold water in the cold water chamber 233 flows to carry away part of the heat, thereby reducing the heat transfer of the melt mechanism 200 to the blanking mechanism 100.

It is worth mentioning that the blanking mechanism 100 comprises an outer hopper assembly 110 for throwing plastic particles and an inner hopper assembly 120 for throwing plastic film scraps, and the outer hopper assembly 110 comprises a suction hopper 111 and an outer hopper 112. The inner hopper assembly 120 includes a cyclone 121, a feed screw 122, and an inner hopper 123. The inner hopper 123 is disposed inside the outer hopper 112. The suction hopper 111 is used to suck plastic particles to the inside of the outer hopper 112. Specifically, the feeding end of the suction hopper 111 is communicated to a material pool for storing plastic particles, and the discharging end of the suction hopper 111 is communicated to the inside of the outer hopper 112. The suction hopper 111 may be a hopper that sucks the raw material into the outer hopper 112 by a negative pressure generated by a high pressure blower. The cyclone 121 serves to introduce the casting film scrap into the interior of the inner hopper 123. Specifically, the feeding end of the cyclone separator 121 is communicated to a rim charge material pool for storing crushed materials, the discharging end of the cyclone separator 121 is communicated to the inside of the inner hopper 123, and the cyclone separator 121 introduces rim charges of the casting film through a self rotating structure. The feed screw 122 is rotatably provided inside the inner hopper 123. The discharge end of the outer hopper 112 is communicated to the mounting cavity 232 through the feed opening 231, and the discharge end of the inner hopper 123 penetrates out of the discharge end of the outer hopper 112 and is communicated to the mounting cavity 232. Specifically, as shown in fig. 6, the inner hopper 123 is disposed inside the outer hopper 112, which is beneficial to reducing the occupied space of the blanking mechanism 100, wherein after the suction hopper 111 sucks the plastic particles to the outer hopper 112, the plastic particles flow out from the discharge end of the outer hopper 112, so as to realize feeding of the blanked plastic particles. After the cyclone separator 121 introduces the plastic film rim charge into the inner hopper 123, the plastic film rim charge flows out from the discharge end of the inner hopper 123, and the feeding of the discharged plastic film rim charge is realized. Because the discharge end of interior hopper 123 is worn out from the discharge end of outer hopper 112, consequently the plastic film rim charge can not enter into outer hopper 112 all the time, hinders the normal input of plastic granules, realizes separately putting in plastic granules and plastic film rim charge. Meanwhile, the inner hopper assembly 120 pushes the rim charge in the inner hopper 123 to move downwards by rotating the discharging screw 122, so that forced discharging is realized, and the efficiency of rim charge discharging is improved.

Optionally, as shown in fig. 6, the outer hopper assembly 110 further comprises a bifurcated hopper 113. The bifurcated hopper 113 has a plurality of discharge ends. The discharge end of the suction hopper 111 is communicated to the feed end of the bifurcated hopper 113. The discharge ends of the bifurcated hopper 113 are uniformly arranged on the outer wall of the outer hopper 112 and communicated to the inside of the outer hopper 112. By arranging the forked hopper 113 between the suction hopper 111 and the outer hopper 112, plastic particles sucked up by the suction hopper 111 are put into the outer hopper 112 in multiple directions, so that the plastic particles are uniformly distributed in the outer hopper 112, the plastic particles are prevented from being piled up on one side of the outer hopper 112 to reduce the blanking speed of the outer hopper assembly 110, and the efficiency of the blanking mechanism 100 is improved.

It should be noted that the melting mechanism 200 further includes a pushing screw 240, the pushing screw 240 is rotatably disposed inside the heating pipe 220, and the pushing screw 240 is sequentially provided with a feeding section 241, a compressing section 242, and a metering section 243 along an axial direction. The feeding section 241 has a first thread 2411 and a first helical groove 2412. The compression section 242 has a second thread 2421 and a second helical groove 2422, the second thread 2421 being provided with a third helical groove 2423. The metering section 243 has a third thread 2431 and a fourth helical groove 2432. The first thread 2411, the second thread 2421 and the third thread 2431 have the same direction of rotation, the end of the first thread 2411 is connected with the beginning of the second thread 2421, and the end of the second thread 2421 is connected with the beginning of the third thread 2431. The end of the first spiral groove 2412 is in contact with the start of the second spiral groove 2422, and the end of the third spiral groove 2423 is in contact with the start of the fourth spiral groove 2432. The shaft of the compression section 242 has a taper, the diameter of the shaft at the beginning of the compression section 242 is smaller than the diameter of the shaft at the end of the compression section 242, the width of the second spiral groove 2422 gradually changes from the beginning of the compression section 242 to the end of the compression section 242 to zero, and the depth of the second spiral groove 2422 gradually changes from the beginning of the compression section 242 to the end of the compression section 242 to zero. As shown in fig. 7, the feeding section 241 of the pushing screw 240 pushes the material falling in the first spiral groove 2412 by using the first thread 2411, so that the material just entering the heating pipe 220 is pushed forward to the compressing section 242 for compression and melting. In the compression section 242, the solid material is in the second spiral groove 2422, and since the rod body of the compression section 242 has the taper, the groove depth of the second spiral groove 2422 gradually changes to zero, and the groove width of the second spiral groove 2422 also gradually changes to zero, so that narrowing from the width and the depth is realized, that is, the volume of the second spiral groove 2422 gradually changes to zero, so that the space between the second spiral groove 2422 and the inner wall of the heating pipe 220 is reduced, and further, the solid material in the second spiral groove 2422 is extruded, and the melting efficiency of the material is improved. Therein, the material melted in the second helical groove 2422 into a molten state is extruded to advance in the third helical groove 2423 to the metering section 243. The material falling in the fourth helical groove 2432 in a molten state is quantitatively pushed by the third thread 2431 in the metering section 243.

In some embodiments, the middle portion of the metering section 243 is further provided with a barrier 244, the barrier 244 is provided with a plurality of fourth threads 2441, a feed helical groove 2442 and a discharge helical groove 2443, the fourth threads 2441 have the same direction of rotation as the first threads 2411, the groove depth of the feed helical groove 2442 gradually changes from the feed end to the discharge end to zero, and the groove depth of the discharge helical groove 2443 gradually changes from the discharge end to the feed end to zero. As shown in fig. 7, by providing the barrier portion 244 in the metering drive, the material enters the barrier portion 244 from the feeding spiral groove 2442, after the incompletely melted solid material reaches the end of the feeding spiral groove 2442, due to the extrusion of the subsequent material, the unmelted solid material passes through the fourth thread 2441 and enters the discharging spiral groove 2443, so that the solid material is secondarily compressed and melted, and finally flows out of the discharging spiral groove 2443, so that the incompletely melted material is secondarily compressed and melted, and the melting efficiency of the melting mechanism 200 is improved.

Other configurations and operations of a plastic extrusion apparatus for a multi-layer co-extruded film according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a plastics extrusion device of multilayer coextrusion film which characterized in that:

comprises a blanking mechanism, a melting mechanism, a co-extrusion composite distributor, a co-extrusion die head, a rack platform and a gantry frame body;

the melting mechanism is provided with a base;

the gantry frame body is provided with a linear moving suspension arm which slides back and forth;

the base is arranged on the rack platform in a sliding mode, and the sliding direction of the base is parallel to the length direction of the melting mechanism;

the gantry frame body is arranged in front of the rack platform, the co-extrusion die head is fixedly connected with the linear moving suspension arm, and the co-extrusion composite distributor is arranged on the co-extrusion die head;

the discharging end of the discharging mechanism is communicated to the feeding end of the melting mechanism to form a raw material melting unit, the output end of the melting mechanism in the raw material melting units is communicated to the feeding end of the co-extrusion composite distributor through metal hoses, and the discharging end of the co-extrusion composite distributor is communicated to the feeding end of the co-extrusion die head.

2. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 1, wherein:

the linear moving suspension arm comprises a sliding seat, an adjusting frame and a suspension plate;

the sliding seat is linearly and slidably arranged on the gantry frame body;

the adjusting frame is connected with the bottom pin of the sliding seat in a left-right sliding manner;

the hanging plate is arranged at the bottom of the adjusting frame in a vertically sliding manner;

and the hanger plates in the two linearly moving hanger arms are respectively and fixedly connected with the two ends of the co-extrusion die head.

3. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 2, wherein:

the adjusting frame is provided with an adjusting hole and an adjusting nut, and the adjusting nut is positioned in the adjusting hole;

the top of hanger plate is equipped with the adjusting screw bolt, the top of adjusting screw bolt from the bottom of alignment jig wear to establish to in the adjusting hole with adjusting nut screw-thread fit.

4. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 1, wherein: the metal hose is provided with a heating element and a heat preservation cover body, the heating element is arranged on the periphery of the metal hose in a surrounding mode, and the heat preservation cover body covers the periphery of the heating element in a segmented mode.

5. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 1, wherein: the base is equipped with the gyro wheel, rack platform is equipped with the guide rail, the slide rail is followed the length direction of melt mechanism extends, the gyro wheel with guide rail sliding fit.

6. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 1, wherein:

the material melting mechanism comprises a heating pipeline, the heating pipeline is provided with a feeding hole, a water-cooling hopper seat is arranged on the periphery of the heating pipeline, and the blanking mechanism is arranged on the water-cooling hopper seat;

the water-cooling hopper seat is provided with a feed opening, an installation cavity and a cold water chamber;

the blanking port is communicated to the inside of the mounting cavity;

the installation cavity is sleeved on the periphery of the heating pipeline, and the feed opening is connected with the feed inlet;

the cold water chamber is arranged on the periphery of the mounting cavity in a surrounding manner;

and the discharge end of the discharging mechanism is communicated to the discharging opening.

7. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 6, wherein:

the blanking mechanism comprises an outer hopper component for throwing plastic particles and an inner hopper component for throwing plastic film rim charge;

the outer hopper assembly comprises a suction hopper and an outer hopper;

the inner hopper assembly comprises a cyclone separator, a discharging screw rod and an inner hopper;

the inner hopper is arranged inside the outer hopper;

the suction hopper is used for sucking plastic particles into the outer hopper;

the cyclone separator is used for introducing the casting film rim charge into the inner hopper;

the discharging screw rod is rotatably arranged inside the inner hopper;

the discharging end of the outer hopper is communicated to the mounting cavity through the discharging port, and the discharging end of the inner hopper penetrates out of the discharging end of the outer hopper and is communicated to the mounting cavity.

8. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 7, wherein:

the outer hopper assembly further comprises a bifurcated hopper;

the bifurcated hopper is provided with a plurality of discharge ends;

the discharge end of the suction hopper is communicated to the feed end of the forked hopper;

and a plurality of discharge ends of the forked hopper are uniformly arranged on the outer wall of the outer hopper and communicated to the inside of the outer hopper.

9. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 6, wherein:

the melting mechanism further comprises a pushing screw rod, the pushing screw rod is rotatably arranged in the heating pipeline in a penetrating mode, and the pushing screw rod is sequentially provided with a feeding section, a compression section and a metering section along the axial direction;

the feed section having a first flight and a first helical groove; the compression section is provided with a second thread and a second spiral groove, and the second thread is provided with a third spiral groove; the metering section has a third thread and a fourth helical groove;

the turning directions of the first thread, the second thread and the third thread are the same, the tail end of the first thread is connected with the starting end of the second thread, and the tail end of the second thread is connected with the starting end of the third thread; the tail end of the first spiral groove is connected with the starting end of the second spiral groove, and the tail end of the third spiral groove is connected with the starting end of the fourth spiral groove;

the rod body of compression section has the tapering, and the rod body diameter at compression section initial end is less than the rod body diameter at compression section terminal end, the groove width of second helicla flute is from the compression section initial end to compression section terminal grade change to zero, the groove depth of second helicla flute is from the compression section initial end to compression section terminal grade change to zero.

10. A plastic extrusion apparatus of a multi-layer co-extruded film as claimed in claim 9, wherein: the middle part of measurement district section still is equipped with protective screen portion, protective screen portion is equipped with a plurality of fourth screw threads, feeding helicla flute and ejection of compact helicla flute, the fourth screw thread with the turning round of first screw thread is the same, the groove depth of feeding helicla flute is from the feed end to the discharge end gradual change to zero, the groove depth of ejection of compact helicla flute is from the discharge end to the pan feeding end gradual change to zero.