Nitrogen protection device for thin film extrusion processing

Abstract

The utility model relates to the technical field of thin films, and discloses a nitrogen protection device for thin film extrusion processing, which comprises a platform, an extruder is fixedly connected to the top end face of the platform, a feed hopper is fixedly connected to the top end face of the extruder, and the feed hopper is fixedly connected to the top end face of the platform. The side wall of the feeding hopper is fixedly connected with an air inlet pipe, and a flow guide assembly is arranged on the inner wall of the feeding hopper. According to the nitrogen protection device for thin film extrusion processing, by arranging the flow guide inclined plate, the flow guide arc plate, the baffle and the flat plate, nitrogen is shunted, a part of nitrogen is blown to external air, then the air is prevented from entering an extruder through the feeding hopper, a positive pressure environment is formed in the feeding hopper and the extruder through flowing of the nitrogen, and the nitrogen protection effect is improved. And the other part of nitrogen pushes the blades and the rotating shaft to rotate, airflow is guided to flow downwards more stably and intensively, and then the nitrogen is protected in the whole extrusion barrel.

Description

Technical Field

[0001] This utility model relates to the field of film technology, specifically to a nitrogen protection device for film extrusion processing. Background Technology

[0002] Plastic film is the raw material for manufacturing woven bags. The production process involves drying the prepared raw materials and then feeding them into the extrusion barrel of an extruder. As the feed screw rotates, the raw materials are forced towards the die head. No air can enter during this process, so nitrogen is needed to fill the entire extrusion barrel for protection, thereby isolating the air.

[0003] According to a public announcement of a nitrogen protection device for film extrusion processing (Announcement No.: CN221584464U), the above application includes a worktable, an extruder is provided on the surface of the worktable, an extrusion cylinder is provided inside the extruder, a feed pipe is provided above the worktable, a feed hopper is provided at the top of the feed pipe, a conveying pipe is provided on one side of the feed pipe, an upper inclined plate is provided on the inner wall of the feed pipe, and a lower inclined plate is provided at the bottom of the upper inclined plate.

[0004] However, in actual use, the nitrogen gas in the above-mentioned nitrogen protection device is blown downwards, but a low-pressure zone is generated when the nitrogen gas passes through, which in turn draws in external air, causing air to be mixed in with the nitrogen gas entering the extruder, thus reducing the protective effect of film extrusion; in view of this, we propose a nitrogen protection device for film extrusion processing. Utility Model Content

[0005] The purpose of this invention is to provide a nitrogen protection device for film extrusion processing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen protection device for film extrusion processing, comprising a platform, an extruder fixedly connected to the top end face of the platform, a feed hopper fixedly connected to the top end face of the extruder, an air inlet pipe fixedly connected to the side wall of the feed hopper, and a flow guiding assembly provided on the inner wall of the feed hopper, the flow guiding assembly comprising:

[0007] A flow guide plate is fixedly connected to the inner wall of the feed hopper. A flow guide arc plate is fixedly connected to the inner wall of the feed hopper. A baffle is fixedly connected to the inner wall of the flow guide plate. A through hole is opened on the top end face of the baffle.

[0008] A flat plate is fixedly connected to the inner wall of the feed hopper. A through hole is fixedly connected to the top end face of the flat plate. A vertical cylinder is fixedly connected to the bottom of the flat plate. A mounting bracket is fixedly connected to the inner wall of the vertical cylinder. The mounting bracket is rotatably connected to a rotating shaft. Blades are fixedly connected to the side wall of the rotating shaft.

[0009] Preferably, a guide arc block is fixedly connected to the top end face of the baffle, and the guide arc block is fixedly connected to the inner wall of the guide inclined plate.

[0010] Preferably, a stop block is fixedly connected to the top end face of the plate, the second through hole is located on the left side of the stop block, the first through hole is located on the right side of the stop block, and an arc-shaped edge is provided on the right side of the stop block.

[0011] Preferably, the guide plate is located on the side of the feed hopper closer to the air inlet pipe, the guide plate is located above the air inlet pipe, the guide arc plate is located on the side of the feed hopper away from the air inlet pipe, the guide arc plate is located below the air inlet pipe, and the flat plate is located between the guide plate and the guide arc plate.

[0012] Preferably, an arc-shaped plate is fixedly connected to the end of the flat plate away from the inner wall of the feed hopper, and an inner chamfer is provided at the bottom of the baffle. The arc-shaped plate and the inner chamfer narrow the air passage, and the airflow is accelerated when passing through the narrow area by the contraction air duct, thereby increasing the local wind speed and expelling the outside air.

[0013] Preferably, the number of blades is set in several groups, and the several groups of blades are equally spaced at the bottom of the plate. When the airflow blows the blades, the rotation of the blades will form a vortex structure in the airflow, generating a turbulent area of ​​air. The vortex can guide the airflow to flow more stably and concentratedly downwards, thereby protecting the nitrogen gas in the entire extrusion cylinder and isolating it from the air.

[0014] Compared with the prior art, this utility model provides a nitrogen protection device for film extrusion processing, which has the following beneficial effects:

[0015] 1. This nitrogen protection device for film extrusion processing uses a guide plate, a guide arc plate, a baffle, and a plate to divert nitrogen gas. Part of the nitrogen gas is blown towards the outside air, thus preventing air from entering the extruder through the feed hopper. The flow of nitrogen gas creates a positive pressure environment inside the feed hopper and the extruder, preventing outside air from entering. The other part of the nitrogen gas drives the blades and the shaft to rotate, guiding the airflow to flow more stably and concentratedly downwards, thereby protecting the nitrogen gas throughout the entire extrusion barrel.

[0016] 2. The nitrogen protection device for film extrusion processing narrows the air path by setting an arc plate and inner chamfer. It accelerates the airflow when passing through the narrow area by using a contraction air duct, thereby increasing the local wind speed and expelling the outside air. The high-speed airflow forms a directional flow, the airflow speed increases, and the direction becomes more concentrated, which restricts the backflow or reflow of the outside airflow into the feed hopper and extruder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the feed hopper of this utility model;

[0019] Figure 3 This is a schematic diagram of the flat plate structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the guide inclined plate structure of this utility model.

[0021] In the diagram: 1. Platform; 2. Extruder; 3. Feed hopper; 4. Air inlet pipe; 5. Flow guide assembly; 501. Flow guide inclined plate; 502. Flow guide arc plate; 503. Baffle; 504. Through hole one; 505. Guide arc block; 506. Flat plate; 507. Through hole two; 508. Vertical cylinder; 509. Mounting bracket; 510. Rotating shaft; 511. Blade; 512. Stop block; 6. Arc plate; 7. Inner chamfer. Detailed Implementation

[0022] like Figures 1-4 As shown, this utility model provides a technical solution: a nitrogen protection device for film extrusion processing, including a platform 1, an extruder 2 fixedly connected to the top end face of the platform 1, a feed hopper 3 fixedly connected to the top end face of the extruder 2, an air inlet pipe 4 fixedly connected to the side wall of the feed hopper 3, and a flow guiding component 5 provided on the inner wall of the feed hopper 3. The flow guiding component 5 includes a flow guiding inclined plate 501, a flow guiding arc plate 502, a baffle 503, a first through hole 504, a guide arc block 505, a flat plate 506, a second through hole 507, a vertical cylinder 508, a mounting bracket 509, a rotating shaft 510, a blade 511, and a stop block 512.

[0023] In one embodiment of this utility model, a guide plate 501 is fixedly connected to the inner wall of the feed hopper 3, a guide arc plate 502 is fixedly connected to the inner wall of the feed hopper 3, a baffle 503 is fixedly connected to the inner wall of the guide plate 501, a through hole 504 is provided on the top end face of the baffle 503, a flat plate 506 is fixedly connected to the inner wall of the feed hopper 3, the guide plate 501 is located on the side of the feed hopper 3 near the air inlet pipe 4, the guide plate 501 is located above the air inlet pipe 4, the guide arc plate 502 is located on the side of the feed hopper 3 away from the air inlet pipe 4, the guide arc plate 502 is located below the air inlet pipe 4, the flat plate 506 is located between the guide plate 501 and the guide arc plate 502, a guide arc block 505 is fixedly connected to the top end face of the baffle 503, and the guide arc block 505 is fixedly connected to the inner wall of the guide plate 501.

[0024] A through hole 2 507 is fixedly connected to the top end face of the plate 506. A stop block 512 is fixedly connected to the top end face of the plate 506. The through hole 2 507 is located on the left side of the stop block 512, and the through hole 1 504 is located on the right side of the stop block 512. An arc-shaped edge is provided on the right side of the stop block 512. A vertical cylinder 508 is fixedly connected to the bottom of the plate 506. A mounting bracket 509 is fixedly connected to the inner wall of the vertical cylinder 508. The mounting bracket 509 is rotatably connected to the rotating shaft 510. A blade 511 is fixedly connected to the side wall of the rotating shaft 510. Several sets of blades 511 are arranged at equal intervals at the bottom of the plate 506. When the airflow blows the blades 511, the rotation of the blades 511 will form a vortex structure in the airflow, generating a turbulent area of ​​air. The vortex can guide the airflow to flow more stably and concentratedly downward, thereby protecting the nitrogen in the entire extrusion cylinder and isolating it from the air.

[0025] Nitrogen gas is blown into the feed hopper 3 through the air inlet pipe 4. The nitrogen gas is guided to the baffle 503 by the guide plate 501. A portion of the nitrogen gas reaches the top of the plate 506 through the through hole 504. This portion of nitrogen gas reaches the guide arc plate 502 through the right side of the plate 506. The guide arc plate 502 guides the nitrogen gas upward and blows it towards the outside air, thereby preventing air from entering the extruder 2 through the feed hopper 3. The flow of nitrogen gas creates a positive pressure environment inside the feed hopper 3 and the extruder 2, preventing outside air from entering.

[0026] Another portion of the nitrogen gas falls onto the flat plate 506 through the left side of the baffle 503. This portion of nitrogen gas enters the vertical cylinder 508. The nitrogen gas drives the blades 511 and the rotating shaft 510 to rotate. The rotation of the blades 511 will form a vortex structure in the airflow, generating a turbulent area of ​​air. The vortex can guide the airflow to flow more stably and concentratedly downwards, thereby protecting the nitrogen gas in the entire extrusion cylinder. The vortex and turbulence increase the mixing and coverage area of ​​the gas, enabling more efficient coverage of the internal space of the extruder 2.

[0027] In addition, an arc-shaped plate 6 is fixedly connected to the end of the plate 506 away from the inner wall of the feed hopper 3. The bottom of the baffle 503 is provided with an inner chamfer 7. The arc-shaped plate 6 and the inner chamfer 7 narrow the air passage. By using the constricted air duct, the airflow is accelerated when passing through the narrow area, thereby increasing the local wind speed and expelling the external air. The high-speed airflow forms a directional flow, the airflow speed increases, and the direction becomes more concentrated, reducing airflow diffusion and turbulence, and restricting the backflow or reflow of external airflow into the feed hopper 3 and the extruder 2.

[0028] In this invention, during use, nitrogen gas is blown into the feed hopper 3 through the air inlet pipe 4. The nitrogen gas is guided to the baffle 503 by the guide plate 501. Part of the nitrogen gas is blown to the guide arc plate 502, which guides the nitrogen gas upward and blows it towards the outside air, preventing air from entering the extruder 2 through the feed hopper 3. The other part of the nitrogen gas drives the blades 511 and the rotating shaft 510 to rotate, guiding the airflow to flow downward more stably and in a concentrated manner, so that the nitrogen gas is protected throughout the extrusion cylinder.

[0029] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A nitrogen protection device for film extrusion processing, comprising a platform (1), wherein an extruder (2) is fixedly connected to the top end face of the platform (1), and a feed hopper (3) is fixedly connected to the top end face of the extruder (2), characterized in that: An air inlet pipe (4) is fixedly connected to the side wall of the feed hopper (3), and a flow guiding component (5) is provided on the inner wall of the feed hopper (3). The flow guiding component (5) includes: A guide plate (501) is fixedly connected to the inner wall of the feed hopper (3). A guide arc plate (502) is fixedly connected to the inner wall of the feed hopper (3). A baffle (503) is fixedly connected to the inner wall of the guide plate (501). A through hole (504) is provided on the top end face of the baffle (503). A plate (506) is fixedly connected to the inner wall of the feed hopper (3). A through hole (507) is fixedly connected to the top end face of the plate (506). A vertical cylinder (508) is fixedly connected to the bottom of the plate (506). A mounting bracket (509) is fixedly connected to the inner wall of the vertical cylinder (508). The mounting bracket (509) is rotatably connected to the rotating shaft (510). A blade (511) is fixedly connected to the side wall of the rotating shaft (510).

2. The nitrogen protection device for film extrusion processing according to claim 1, characterized in that: The top end face of the baffle (503) is fixedly connected to a guide arc block (505), and the guide arc block (505) is fixedly connected to the inner wall of the guide inclined plate (501).

3. The nitrogen protection device for film extrusion processing according to claim 1, characterized in that: A stop block (512) is fixedly connected to the top end face of the plate (506). The second through hole (507) is located on the left side of the stop block (512), and the first through hole (504) is located on the right side of the stop block (512). An arc-shaped edge is provided on the right side of the stop block (512).

4. The nitrogen protection device for film extrusion processing according to claim 1, characterized in that: The guide plate (501) is located on the side of the feed hopper (3) near the air inlet pipe (4), the guide plate (501) is located above the air inlet pipe (4), the guide arc plate (502) is located on the side of the feed hopper (3) away from the air inlet pipe (4), the guide arc plate (502) is located below the air inlet pipe (4), and the flat plate (506) is located between the guide plate (501) and the guide arc plate (502).

5. A nitrogen protection device for film extrusion processing according to claim 1, characterized in that: An arc-shaped plate (6) is fixedly connected to one end of the plate (506) away from the inner wall of the feed hopper (3), and an inner chamfer (7) is provided at the bottom of the baffle (503).

6. A nitrogen protection device for film extrusion processing according to claim 1, characterized in that: The number of blades (511) is set in several groups, and the several groups of blades (511) are equally spaced at the bottom of the plate (506).

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