Three-layer co-extrusion double-die-head film blowing unit

Abstract

The invention discloses a three-layer co-extrusion double-die-head film blowing unit. The three-layer co-extrusion double-die-head film blowing unit comprises three groups of feeding units and die head devices, the feeding unit comprises a four-component feeding expansion module, a screw feeding mechanism and an integrated screen changing mechanism. The die head device is composed of a first die head, a second die head and a three-way flow divider. The four-component feeding expansion module achieves simultaneous feeding of four raw materials, and after the raw materials are conveyed through the screw feeding mechanism and filtered through the integrated screen changing mechanism, the raw materials are distributed to the double die heads through the three-way flow divider to be synchronously extruded. According to the unit, the production efficiency is greatly improved through synchronous extrusion of the double die heads, and the large-scale production requirement is met; the four-component feeding expansion module expands the feeding types, optimizes the raw material mixing process and reduces the production energy consumption; the integrated screen changing mechanism simplifies screen changing operation, guarantees production continuity, reduces raw material waste and efficiency loss, and effectively solves the problems that a traditional film blowing unit is low in production efficiency, high in energy consumption and complex in screen changing.

Description

Technical Field

[0001] The present invention relates to the technical field of blown film machines, and particularly relates to a three-layer co-extrusion double die head blown film unit. Background Art

[0002] In the plastic film production industry, the blown film unit is the core production equipment, and its performance directly affects the production efficiency, quality and production cost of the film. Traditional blown film units usually adopt a single die head design. During the production process, the extrusion efficiency of a single die head is relatively low, making it difficult to meet the requirements of large-scale production, resulting in a long production cycle and being unable to adapt to the supply requirements of the rapidly changing market. At the same time, the single feeding and extrusion method results in high production energy consumption, low resource utilization efficiency, and increases the production cost of enterprises. In addition, the screen changer mechanism of traditional blown film units has a single function, and the screen changing operation is complex and time-consuming. It not only affects the continuity of production, but also easily causes raw material waste and a decrease in production efficiency during the screen changing process. Therefore, developing a new type of blown film unit that can improve production efficiency, reduce energy consumption and is easy to operate has become an urgent problem to be solved in the plastic film production field. Summary of the Invention

[0003] In view of the deficiencies in the background art, the present invention provides a three-layer co-extrusion double die head blown film unit.

[0004] The technical solution adopted by the present invention is: a three-layer co-extrusion double die head blown film unit, including a feeding unit and a die head device. The feeding unit has three groups, and the feeding unit includes a four-component feeding expansion module, a screw feeding mechanism and an integrated screen changer mechanism. The die head device includes die head one, die head two and a diverter; The four-component feeding expansion module includes a bottom shell, four hoppers arranged on the bottom shell, a suction machine adaptively connected to each hopper, a stirring device connected to the outlets of the four hoppers, and a weighing and metering device arranged on the bottom shell; The feeding pipe of the screw feeding mechanism is connected to the discharging end of the stirring device; The integrated screen changer mechanism is arranged on the feeding pipe; The three feeding ports of the diverter are respectively connected to the feeding pipes of the three feeding units, and the other two discharging ports are respectively connected to die head one and die head two.

[0005] Furthermore, it further includes a cooling component adaptively connected to each die head. The cooling component includes a main fan, an air duct connected to the main fan through an inlet air duct, and a double-air-port air ring connected to the air duct through a connecting pipe. Furthermore, there are multiple connecting pipes, which are arranged equidistantly in a circumferential manner on the outer circles of the air duct and the double-air-port air ring. A die head bottom plate for installing the die head is fixed on the air duct.

[0006] Furthermore, a plurality of anti-scald covers are arranged at equal intervals along the length direction of the feeding pipe, and a heat dissipation fan for blowing air to dissipate heat from the surface of the feeding pipe inside the anti-scald cover is fixed at the bottom of each anti-scald cover. Furthermore, an air outlet is arranged on the anti-scald cover, and a cover is arranged above the air outlet, leaving an air outlet gap between the cover and the surface of the anti-scald cover.

[0007] Furthermore, mounting openings for mounting the hopper are arranged at intervals on the upper end surface of the bottom shell, the stirring device is installed inside the bottom shell below the mounting openings, a material collecting hopper is connected to the inlet of the stirring device, and the material collecting hopper is arranged directly below the mounting openings for receiving the materials falling from the hopper.

[0008] Furthermore, a plurality of die heating coils are arranged at intervals on the outer circles of the first die and the second die.

[0009] Furthermore, the integrated screen changing mechanism includes a first screen changing disc, a second screen changing disc and a screen plate seat. The screen plate seat is rotatably connected between the first screen changing disc and the second screen changing disc through a rotating shaft. Two screen holes are symmetrically arranged on the screen plate seat, and filter screens are installed in the screen holes. Feeding through holes are arranged on the first screen changing disc and the second screen changing disc. By rotating the screen plate seat, one of the screen holes can be aligned with the feeding through hole, and the other screen hole is rotated out to the screen changing station opening on the first screen changing disc.

[0010] Furthermore, flange plates are arranged at the ends of the feeding through holes on the first screen changing disc and the second screen changing disc, and a handle is also connected to the screen plate seat.

[0011] Furthermore, fixing columns are arranged on both sides of the second screen changing disc, and fixing holes for fixedly connecting with the fixing columns are arranged on the first screen changing disc.

[0012] The beneficial effects of the present invention are as follows: First of all, in the dual-die head device, the first die and the second die are connected to three feeding units through a diverter, realizing synchronous extrusion of the dual-die heads. Compared with the traditional single-die head film blowing unit, the production efficiency is greatly improved, more plastic films can be produced in the same time, effectively meeting the large-scale production requirements, shortening the production cycle, and improving the enterprise's response speed to the market. Secondly, the four-component feeding expansion module includes four hoppers, a suction machine, a stirring device and a weighing and metering device, which can process four raw materials at the same time, expanding the feeding types, meeting the requirements of producing films by mixing multiple raw materials, and through scientific structural design, optimizing the raw material mixing process, reducing raw material waste, improving resource utilization efficiency, and thus reducing production energy consumption and saving production costs for the enterprise. Furthermore, the integrated screen changer mechanism is arranged on the feeding pipe. Compared with the traditional screen changer mechanism with a single function, the screen changing operation process is simplified, the screen changing time is greatly shortened, the continuity of production is ensured, and the waste of raw materials and the loss of production efficiency caused by screen changing are reduced.

[0013] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages.

[0014] Hereinafter, the present invention will be described in further detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention.

[0016] Figure 2 It is a schematic diagram of another perspective of the present invention.

[0017] Figure 3 It is a schematic structural diagram of the anti-scald cover.

[0018] Figure 4 It is a schematic structural diagram of the four-component feeding expansion module.

[0019] Figure 5 It is a schematic diagram of another perspective of the four-component feeding expansion module.

[0020] Figure 6 It is a schematic structural diagram of the integrated screen changer mechanism.

[0021] Figure 7 It is an exploded view of the integrated screen changer mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0024] The present invention provides a three-layer coextrusion double die head blown film unit.

[0025] In this embodiment, refer to Figure 1-7, The three-layer coextrusion double die head blown film unit includes a feeding unit and a die head device. There are three groups of feeding units, and each feeding unit includes a four-component feeding expansion module 1, a screw feeding mechanism 2, and an integrated screen changer mechanism 3. The die head device includes a die head 1 4, a die head 2 5, and a diverter 6; The four-component feeding expansion module includes a bottom shell 7, four hoppers 8 arranged on the bottom shell 7, a suction machine 9 adaptively connected to each hopper 8, a stirring device 10 connected to the outlets of the four hoppers 8, and a weighing and metering device 11 arranged on the bottom shell 7; The feeding pipe 12 of the screw feeding mechanism is connected to the discharging end of the stirring device; The integrated screen changer mechanism is arranged on the feeding pipe; The three feeding ports of the diverter 6 are respectively connected to the feeding pipes of the three feeding units, and the other two discharging ports are respectively connected to the die head 1 and the die head 2.

[0026] In the above technical solution, the three groups of feeding units respectively realize the feeding of four raw materials through the four-component feeding expansion module, are transported by the screw feeding mechanism, and the integrated screen changer mechanism filters the raw materials. The feeding pipes of the three feeding units are connected to the diverter, and then the diverter transports the raw materials to the die head 1 and the die head 2 respectively to realize synchronous extrusion of the double die heads. Multiple groups of feeding units cooperate with the double die heads to greatly improve production efficiency and meet the needs of large-scale production; the four-component feeding expansion module realizes simultaneous feeding of multiple raw materials and expands the types of feeding; the integrated screen changer mechanism ensures the purity of the raw materials, and the screen changing operation has little impact on production continuity, reducing raw material waste and efficiency loss.

[0027] Among them, the weighing and metering device can monitor the feeding weight of each hopper in real time. After each group of suction machines transports the materials to the hoppers, the weighing and metering device can accurately measure the total feeding amount, accurate to the number of grams of feeding per minute. Through this data, the hourly production output can be quickly calculated (for example, hourly output = grams of feeding per minute × 60 minutes), and then the total production amount for one day (calculated according to 24 hours) can be obtained, presented in tons (one-day output = hourly output × 24 hours ÷ 1000000 grams / ton), which is convenient for production management personnel to intuitively grasp the production progress and scientifically arrange the production plan.

[0028] Specifically, it also includes a cooling component adaptively connected to each die head. The cooling component includes a main fan 13, a wind cylinder 15 connected to the main fan 13 through an air inlet pipe 14, and a double-air outlet air ring 17 connected to the wind cylinder 15 through a connecting pipe 16. In this embodiment, each die head is adaptively connected to a cooling component. The wind generated by the main fan enters the air duct through the air inlet pipe, and then is transmitted to the double-air outlet air ring through the connecting pipe. The double-air outlet air ring cools the film extruded by the die head, preventing problems such as film deformation and adhesion caused by excessive temperature, ensuring the forming quality and appearance of the film, and improving the product quality.

[0029] Specifically, there are multiple connecting pipes, which are arranged circumferentially at equal intervals on the outer circles of the air duct and the double-air outlet air ring. A die head bottom plate 18 for installing the die head is fixed on the air duct.

[0030] In this embodiment, multiple connecting pipes are arranged circumferentially at equal intervals on the outer circles of the air duct and the double-air outlet air ring, enabling the wind to be evenly transmitted to the double-air outlet air ring; the die head bottom plate is fixed on the air duct for installing the die head, ensuring the stability of the die head installation. The above structure can ensure the uniform cooling of the film by the double-air outlet air ring, avoiding inconsistent film thickness or wrinkles caused by uneven cooling; the stable die head installation structure is conducive to improving the stability of the production process and the quality of film production.

[0031] Specifically, multiple heat insulation covers 19 are arranged at equal intervals along the length direction of the feeding pipe. A heat dissipation fan 20 for blowing air to dissipate heat on the surface of the feeding pipe inside the heat insulation cover is fixed at the bottom of each heat insulation cover 19.

[0032] In this embodiment, multiple heat insulation covers are arranged at equal intervals along the length direction of the feeding pipe. The heat dissipation fan is fixed at the bottom of the heat insulation cover to blow air to dissipate heat on the surface of the feeding pipe, reducing the temperature of the feeding pipe. Preventing the temperature of the feeding pipe from being too high from affecting the raw material performance and avoiding problems such as deterioration and caking of the raw material in the feeding pipe due to excessive temperature, ensuring the stability of raw material transportation and product quality.

[0033] Specifically, an air outlet 21 is provided on the heat insulation cover, and a cover 22 is provided above the air outlet 21, leaving an air outlet gap 23 between the cover and the surface of the heat insulation cover.

[0034] In this embodiment, the air outlet on the heat insulation cover is used to discharge the hot air blown by the heat dissipation fan. The cover and the surface of the heat insulation cover leave an air outlet gap to reasonably guide the hot air discharge path. Optimizing the hot air discharge path enables the hot air to be discharged smoothly, improving the heat dissipation efficiency and further enhancing the heat dissipation protection effect of the heat insulation cover on the feeding pipe.

[0035] Specifically, mounting openings 24 for installing the hopper are arranged at intervals on the upper end surface of the bottom shell. The stirring device is installed in the bottom shell below the mounting openings 24. A material collecting hopper 25 is connected to the inlet of the stirring device. The material collecting hopper 25 is arranged directly below the mounting opening for receiving the materials falling from the hopper.

[0036] In this embodiment, the installation opening on the upper end surface of the bottom shell is used to install the hopper. The stirring device is installed inside the bottom shell below the installation opening. The material-gathering hopper is connected to the inlet of the stirring device and is located directly below the installation opening. After receiving the materials falling from the hopper, it sends them into the stirring device for mixing. The reasonable structural layout enables the raw materials to smoothly enter the stirring device, ensuring the accuracy and efficiency of the mixing of the four raw materials, and providing guarantee for the subsequent production of films with stable performance.

[0037] Specifically, a number of die head heating coils 26 are arranged at intervals on the outer circles of the first die head and the second die head.

[0038] In this embodiment, after the die head heating coils on the outer circles of the first die head and the second die head are electrified, they generate heat to heat the die head, keeping the die head at a suitable temperature to ensure that the raw materials can be smoothly extruded and formed.

[0039] Specifically, the integrated screen-changing mechanism includes a first screen-changing disc 27, a second screen-changing disc 28, and a screen plate seat 29. The screen plate seat is rotatably connected between the first screen-changing disc and the second screen-changing disc through a rotating shaft 30. Two screen holes 31 are symmetrically arranged on the screen plate seat. A filter screen 32 is installed in the screen holes 31. Through holes 33 for passing materials are arranged on the first screen-changing disc and the second screen-changing disc. By rotating the screen plate seat, one of the screen holes can be aligned with the through hole for passing materials, while the other screen hole rotates out to the screen-changing working port 34 on the first screen-changing disc.

[0040] In this embodiment, in the integrated screen-changing mechanism, the screen plate seat rotates between the first screen-changing disc and the second screen-changing disc through the rotating shaft. Filter screens are installed in the two symmetric screen holes on the screen plate seat, and through holes for passing materials are arranged on the first screen-changing disc and the second screen-changing disc. By rotating the screen plate seat, one of the screen holes can be aligned with the through hole for passing materials for filtering, and the other screen hole rotates out to the screen-changing working port for screen-changing operation. It can achieve screen-changing without stopping the machine, reduce the screen-changing time, ensure the continuity of production, reduce the loss of production efficiency and waste of raw materials caused by screen-changing, and at the same time ensure that the raw materials always pass through the filter screen to guarantee the product quality.

[0041] Specifically, flange plates 35 are arranged at the ends of the through holes for passing materials on the first screen-changing disc and the second screen-changing disc, and a handle 36 is also connected to the screen plate seat.

[0042] In this embodiment, the arrangement of the flange plates at the ends of the through holes for passing materials on the first screen-changing disc and the second screen-changing disc facilitates the connection and adaptation of the integrated screen-changing mechanism to external pipe fittings; the handle on the screen plate seat facilitates the operator to rotate the screen plate seat.

[0043] Specifically, fixing columns 37 are arranged on both sides of the second screen-changing disc, and fixing holes 38 for fixedly connecting with the fixing columns 37 are arranged on the first screen-changing disc.

[0044] In this embodiment, the fixing columns of the second screen-changing disc are fixedly matched with the fixing holes of the first screen-changing disc to realize the fixation of the first screen-changing disc and the second screen-changing disc.

[0045] Notice to all technical personnel: Although the present invention has been described according to the above specific embodiments, the idea of the present invention is not limited to this invention alone. Any modification that utilizes the idea of the present invention will be included within the scope of protection of this patent right.

Claims

1. A three-layer co-extrusion double-die film blowing machine unit, comprising a feeding unit and a die device, characterized in that: The feeding unit is divided into three groups, and the feeding unit includes a four-component feeding expansion module, a screw feeding mechanism and an integrated screen changing mechanism. The die head device includes die head 1, die head 2 and a diverter; The four-component feeding expansion module includes a bottom shell, four hoppers arranged on the bottom shell, a suction machine adapted to be connected to each hopper, a stirring device connected to the outlets of the four hoppers, and a weighing meter arranged on the bottom shell; The feeding pipe of the screw feeding mechanism is connected to the discharge end of the stirring device; The integrated screen changing mechanism is arranged on the feeding pipe; The three feed ports of the diverter are respectively connected to the feed pipes of the three feed units, and the other two discharge ports are respectively connected to the die head 1 and the die head 2.

2. The three-layer co-extrusion double-die film blowing machine according to claim 1, characterized in that: It also includes a cooling component adapted to be connected to each die head, and the cooling component includes a main fan, a wind tube connected to the main fan through an air inlet pipe, and a double-air outlet air ring connected to the wind tube through a connecting pipe.

3. The three-layer co-extrusion double-die film blowing machine according to claim 2, characterized in that: There are multiple connecting pipes which are arranged at equal intervals on the outer rings of the air cylinder and the double-air outlet air ring. A die head bottom plate for installing the die head is fixed on the air cylinder.

4. The three-layer co-extrusion double-die film blowing machine according to claim 1, characterized in that: A plurality of anti-scalding covers are arranged at equal intervals along the length direction of the feeding pipe, and a heat dissipation fan for blowing air toward the surface of the feeding pipe in the anti-scalding cover to dissipate heat is fixed at the bottom of each anti-scalding cover.

5. The three-layer co-extrusion double-die film blowing machine according to claim 4, characterized in that: An air outlet is arranged on the anti-scalding cover, a cover is arranged above the air outlet, and an air outlet gap is reserved between the cover and the surface of the anti-scalding cover.

6. The three-layer co-extrusion double-die film blowing machine according to claim 1, characterized in that: The upper end surface of the bottom shell is provided with installation openings for installing the hopper at intervals, the stirring device is installed in the bottom shell below the installation openings, and a material gathering hopper is connected to the inlet of the stirring device. The material gathering hopper is arranged directly below the installation openings for receiving materials falling from the hopper.

7. The three-layer co-extrusion double-die film blowing machine according to claim 1, characterized in that: A plurality of die head heating rings are arranged at intervals on the outer rings of the die head 1 and the die head 2.

8. The three-layer co-extrusion double-die film blowing machine set according to claim 1, characterized in that: The integrated screen changing mechanism comprises a screen changing disk 1, a screen changing disk 2 and a screen plate seat, wherein the screen plate seat is rotatably connected between the screen changing disk 1 and the screen changing disk 2 via a rotating shaft, two mesh holes are symmetrically arranged on the screen plate seat, filters are installed in the mesh holes, and material passing holes are arranged on the screen changing disk 1 and the screen changing disk 2, and by rotating the screen plate seat, one of the mesh holes can be aligned with the material passing hole, and the other mesh hole can be rotated out to the screen changing station opening on the screen changing disk 1.

9. The three-layer co-extrusion double-die film blowing machine unit according to claim 8, characterized in that: The ends of the material passing through holes on the first and second mesh changing plates are both provided with flanges, and a handle is also connected to the mesh plate seat.

10. The three-layer co-extrusion double-die film blowing machine set according to claim 8, characterized in that: The two sides of the second network changing disk are provided with fixing columns, and the first network changing disk is provided with fixing holes which are fixedly connected with the fixing columns.

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