PE film blowing device

Abstract

The utility model provides a PE film blowing device which comprises a film blowing die head and a cooling air tower, the film blowing die head comprises an outer die base and an inner die core, the top of the inner die core is provided with the cooling air tower, the cooling air tower comprises an inner pipe fitting and an outer pipe sleeve, an air guide inner cavity is formed between the inner pipe fitting and the outer pipe sleeve, and the outer wall of the outer pipe sleeve is provided with a blowing grating. According to the utility model, the air inlet interface is externally connected with air supply equipment, and cooling air after temperature regulation is filled, so that the cooling air is guided into the air guide inner cavity formed between the inner pipe fitting and the outer pipe sleeve through the air inlet channel, the shunting ring channel and the branch air through holes, and then is uniformly discharged from the periphery through the air blowing grid arranged on the outer wall of the outer pipe sleeve, thereby blowing and cooling the interior of the PE film; and finally, the gas is guided to the exhaust interface through the inner cavity of the inner pipe fitting and the exhaust channel to be exhausted, so that blowing inflation of the PE film can be ensured, airflow circulation can be realized, and the cooling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of PE film production equipment, and in particular to a PE film blowing device. Background Technology

[0002] Blown film is a plastics processing method that involves heating and melting plastic particles and then blowing them into a thin film. Typically, a polymer is extruded into a tubular preform, which is then blown to the required thickness using high-pressure air under good melt flow conditions. After cooling and setting, it becomes a finished film. During the blown film forming process, the PE film undergoes melting and shaping steps inside the die. Subsequently, the film needs to be cooled at an appropriate temperature to ensure its shape stability and absence of defects. Existing cooling methods involve blowing room-temperature gas onto the PE film, which results in unstable and difficult-to-control cooling, as well as low coverage and uneven cooling. Utility Model Content

[0003] To address the aforementioned problems, this invention proposes a PE film blowing device to more accurately resolve the problems described above.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a PE film blowing device, including a blowing die head and a cooling tower. The blowing die head includes an outer mold base and an inner mold core, with the inner mold core assembled in the outer mold base. A stepped mold cavity is formed between the outer mold base and the inner mold core, and the top of the stepped mold cavity is the blowing port. The outer wall of the outer mold base has several feeding channels communicating with the stepped mold cavity, and the feeding channels are arranged in a circular array along the center of the inner mold core. A cooling tower is provided on the top of the inner mold core, and the cooling tower includes an inner tube and an outer sleeve. An air-guiding cavity is formed between the inner mold core and the outer tube. A flow-dividing ring channel is opened at the top of the inner mold core. Several branch air passages are opened between the flow-dividing ring channel and the air-guiding cavity. The several branch air passages are arranged in a ring array along the center of the cooling tower. An air-blowing grid is provided on the outer wall of the outer tube sleeve. An air inlet interface connected to the air inlet channel is opened on the outer wall of the outer mold base. An exhaust channel connected to the inner tube cavity channel is opened in the middle of the inner mold core. An exhaust interface connected to the exhaust channel is opened on the outer wall of the blown film die head. The upper port of the inner tube is a return air port.

[0006] Furthermore, the air-blowing grille is composed of several air guide hoods arranged at equal intervals along the vertical direction. The air-blowing grille is a conical hood, and the air-blowing grille's air-guiding direction is obliquely upward at 60°-75°.

[0007] Furthermore, the top of the inner tube is provided with a conical air guide hood, and an air duct top cover is provided above the air guide hood. The air duct top cover is fixed to the air guide hood by a bracket.

[0008] Furthermore, the cross-section of the air duct top cover is V-shaped, and the upper outer edge of the air duct top cover is an outwardly curved annular arc cover.

[0009] Furthermore, the cooling tower is composed of several sections of inner pipe fittings and outer pipe sleeves connected together. The top inner wall of the inner pipe fittings is provided with internal threads, and the top outer wall of the outer pipe sleeve is provided with external threads. The bottom of both the inner pipe fittings and the outer pipe sleeves are provided with threaded connection parts, and the sections of inner pipe fittings and outer pipe sleeves are connected by threads.

[0010] The beneficial effects of this utility model are:

[0011] 1. This utility model connects to an external air supply device through an air inlet to fill in temperature-controlled cooling gas. The cooling gas is then introduced into the air guide cavity formed between the inner pipe and the outer pipe through the air inlet channel, the diversion ring channel, and the branch air passage. Then, it is evenly discharged around the perimeter through the air blowing grid set on the outer wall of the outer pipe, thereby blowing and cooling the inside of the PE membrane. Finally, the gas is discharged through the inner cavity of the inner pipe and the exhaust channel to the exhaust port. This can ensure that the PE membrane is inflated by air blowing and realize airflow circulation, thereby improving cooling efficiency.

[0012] 2. In this utility model, the air blowing grille is composed of several air guide hoods arranged at equal intervals in the vertical direction. The air blowing grille is a conical hood, which causes the gas discharged along the air blowing grille to be blown out at an angle of 60°-75° upward. The top of the inner pipe is provided with an air guide hood in the shape of a conical hood. Above the air guide hood is an air intake top cover, which is used to stably and effectively return the upward airflow outside the cooling tower to the inner cavity of the inner pipe.

[0013] 3. The cooling tower in this utility model is composed of several sections of inner pipes and outer pipe sleeves connected together. The inner pipes and outer pipe sleeves of each section are connected by threads. The components can be added or removed according to the production height of the PE film, and the assembly is highly flexible. Attached Figure Description

[0014] Figure 1 This is a half-sectional view of the three-dimensional structure of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 3 This is a front view of the structure of this utility model;

[0017] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0018] Figure 5 This is a cross-sectional view of the blown film die head in this utility model.

[0019] In the diagram: 1. Blown film die head; 101. Outer mold base; 1011. Stepped mold cavity; 1012. Feed channel; 1013. Blown film nozzle; 1014. Air inlet; 1015. Exhaust port; 102. Inner mold core; 1021. Air inlet channel; 1022. Diverting ring channel; 1023. Branch air passage; 1024. Exhaust channel; 2. Cooling tower; 201. Inner pipe fitting; 202. Outer pipe sleeve; 2021. Blowing grid; 203. Threaded connection; 204. Air guide hood; 205. Air duct top cover; 2051. Support; 3. PE film. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] A PE film blowing device includes a blowing die head 1 and a cooling tower 2. The blowing die head 1 includes an outer mold base 101 and an inner mold core 102. The inner mold core 102 is assembled in the outer mold base 101. A stepped mold cavity 1011 is formed between the outer mold base 101 and the inner mold core 102. The top of the stepped mold cavity 1011 is a blowing nozzle 1013. The outer wall of the outer mold base 101 is provided with several feeding channels 1012 that communicate with the stepped mold cavity 1011. The several feeding channels 1012 are arranged in a ring array along the center of the inner mold core 102. The feeding channels 1012 uniformly introduce PE film hot melt material into the inner cavity of the stepped mold cavity 1011 through an external PE film hot melt material supply pipeline. Finally, the material is ejected at the blowing nozzle 1013 to form a cylindrical PE film 3.

[0022] The inner mold core 102 is equipped with a cooling tower 2 at its top. The cooling tower 2 includes an inner pipe 201 and an outer pipe sleeve 202, forming an air guiding cavity between the inner pipe 201 and the outer pipe sleeve 202. A diversion ring channel 1022 is opened at the top of the inner mold core 102. Several branch air passages 1023 are opened between the diversion ring channel 1022 and the air guiding cavity. The several branch air passages 1023 are arranged in a ring array along the center of the cooling tower 2. The outer wall of the outer pipe sleeve 202 is equipped with an air blowing grille 2021. The outer wall of the outer mold base 101 is provided with an air inlet channel 10. The air inlet 1014 is connected to the air supply pipeline, and the air supply pipeline is combined with the temperature control equipment to adjust the temperature of the supplied gas. The middle part of the inner mold core 102 is provided with an exhaust channel 1024 that is connected to the inner cavity channel of the inner tube 201 to discharge the gas after heat exchange. The outer wall of the blown film die head 1 is provided with an exhaust port 1015 that is connected to the exhaust channel 1024. The exhaust port 1015 is connected to the hot waste gas treatment pipeline to discharge and treat the hot waste gas. The upper port of the inner tube 201 is a return air port.

[0023] The technical solutions in the above-described embodiments of this application have at least the following technical effects or advantages: This utility model connects an external air supply device through the air inlet 1014 to charge in temperature-controlled cooling gas. The cooling gas is then introduced into the air guide cavity formed between the inner pipe 201 and the outer pipe sleeve 202 through the air inlet channel 1021, the diversion ring channel 1022, and the branch air passage 1023. Then, it is evenly discharged around the perimeter through the air blowing grille 2021 provided on the outer wall of the outer pipe sleeve 202, thereby blowing and cooling the inside of the PE membrane 3. Finally, the gas is discharged through the inner cavity of the inner pipe 201 and the exhaust channel 1024 to the exhaust port 1015. This not only ensures that the PE membrane 3 is inflated by blowing air but also realizes airflow circulation, thereby improving cooling efficiency. Example 2

[0024] Combination Figure 2 , Figure 3 and Figure 5 As shown, the air blowing grille 2021 is composed of several air guide shrouds arranged at equal intervals along the vertical direction. The air blowing grille 2021 is a conical shroud, which causes the gas discharged along the air blowing grille 2021 to be blown out at an angle of 60°-75° upward. The top of the inner pipe 201 is provided with an air guide shroud 204 in the shape of a conical shroud. Above the air guide shroud 204 is an air intake top cover 205. The air intake top cover 205 is fixed to the air guide shroud 204 by a bracket 2051. The cross-section of the air intake top cover 205 is V-shaped, and the outer edge of the upper end of the air intake top cover 205 is an outwardly curved annular arc cover, which is used to stably and effectively return the upward airflow outside the cooling tower 2 to the inner cavity of the inner pipe 201.

[0025] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: In this utility model, the air blowing grille 2021 is composed of several air guide hoods arranged at equal intervals in the vertical direction. The air blowing grille 2021 is a conical hood, so that the gas discharged along the air blowing grille 2021 is blown out at an angle of 60°-75° upward. The top of the inner pipe 201 is provided with an air guide hood 204 in the shape of a conical hood. Above the air guide hood 204 is an air duct top cover 205, which is used to stably and effectively return the upward airflow outside the cooling tower 2 to the inner cavity of the inner pipe 201. Example 3

[0026] The cooling tower 2 is composed of several sections of inner pipe fittings 201 and outer pipe sleeves 202 connected together. The inner wall of the top of the inner pipe fitting 201 is provided with internal threads, and the outer wall of the top of the outer pipe sleeve 202 is provided with external threads. The bottom of both the inner pipe fitting 201 and the outer pipe sleeve 202 is provided with threaded connection parts 203. The sections of inner pipe fittings 201 and outer pipe sleeves 202 are connected by threads.

[0027] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: In this utility model, the cooling tower 2 is composed of several sections of inner pipe 201 and outer pipe sleeve 202 connected together. The sections of inner pipe 201 and outer pipe sleeve 202 are connected by threads. The PE film 3 can be added or removed according to the production height, and the assembly is highly flexible.

[0028] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A PE film blowing device comprising a film blowing die (1) and a cooling air tower (2), characterized in that, The film blowing die (1) comprises an outer die seat (101) and an inner die core (102), the inner die core (102) is assembled in the outer die seat (101), a stepped die cavity (1011) is formed between the outer die seat (101) and the inner die core (102), the top of the stepped die cavity (1011) is a film blowing port (1013), the outer wall of the outer die seat (101) is provided with a plurality of feeding channels (1012) communicated with the stepped die cavity (1011), and the plurality of feeding channels (1012) are arranged in a ring array along the center of the inner die core (102); the top of the inner die core (102) is provided with a cooling gas tower (2), the cooling gas tower (2) comprises an inner pipe (201) and an outer pipe sleeve (202), a gas guiding inner cavity is formed between the inner pipe (201) and the outer pipe sleeve (202), a shunt ring channel (1022) is formed in the top of the inner die core (102), a plurality of branch gas through holes (1023) are formed between the shunt ring channel (1022) and the gas guiding inner cavity, the plurality of branch gas through holes (1023) are arranged in a ring array along the center of the cooling gas tower (2), the outer wall of the outer pipe sleeve (202) is provided with a gas blowing grid (2021), the outer wall of the outer die seat (101) is provided with a gas inlet interface (1014) communicated with the gas inlet channel (1021), the middle part of the inner die core (102) is provided with a gas outlet channel (1024) communicated with the inner cavity of the inner pipe (201), the outer wall of the film blowing die (1) is provided with a gas outlet interface (1015) communicated with the gas outlet channel (1024), and the upper end of the inner pipe (201) is a backflow gas port.

2. The PE film blowing device according to claim 1, characterized in that, The gas blowing grid (2021) is composed of a plurality of wind guide covers arranged at equal intervals in the vertical direction, the gas blowing grid (2021) is a conical cover body, and the wind guide direction of the gas blowing grid (2021) is inclined upward by 60-75 degrees.

3. The PE film blowing device according to claim 1, wherein, The top of the inner pipe (201) is provided with a gas guiding cover (204) in the form of a conical cover body, the upper part of the gas guiding cover (204) is provided with a gas guiding top cover (205), and the gas guiding top cover (205) is fixed to the gas guiding cover (204) through a support (2051).

4. The PE film blowing device according to claim 3, characterized in that, The gas guiding top cover (205) is in the shape of a "V" in cross section, and the upper end of the gas guiding top cover (205) is an outwardly curved annular arc surface cover.

5. The PE film blowing device according to claim 1, wherein, The cooling gas tower (2) is composed of a plurality of inner pipes (201) and outer pipe sleeves (202) connected together, the inner wall of the top of the inner pipe (201) is provided with an inner thread, the outer wall of the top of the outer pipe sleeve (202) is provided with an outer thread, the bottom of the inner pipe (201) and the bottom of the outer pipe sleeve (202) are provided with a threaded connection part (203), and the inner pipes (201) and the outer pipe sleeves (202) are connected through threads.

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