Three-layer co-extrusion blown film machine

Abstract

This utility model relates to the field of blown film machine technology, specifically a three-layer co-extrusion blown film machine, including a blown film die head, an air inlet pipe, a mounting box, a docking mechanism, a filtering mechanism, and an adjusting mechanism. An air inlet fan for blown film is installed on one side of the bottom of the blown film die head. The air inlet pipe is positioned between the air inlet fan and the blown film die head, with one end connected to the air outlet of the air inlet fan and the other end connected to the air inlet of the blown film die head. The mounting box is positioned between the blown film die head and the air inlet fan, and both sides of the mounting box are equipped with sealing covers. Two sets of docking mechanisms are provided. The filtering mechanism is located inside the mounting box. The adjusting mechanism is located on the mounting box. This utility model, through its adjusting mechanism and dual-filter design, allows for filter switching without stopping the machine, avoiding production capacity loss and extended production cycles caused by downtime. It also avoids additional energy consumption during start-up and shutdown, reducing the overall operating cost of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, specifically to a three-layer co-extrusion blown film machine. Background Technology

[0002] A three-layer co-extrusion blown film machine uses a co-extrusion process to press three raw materials together while the plastic is in a molten state to form a three-layer co-extruded film. Then, a blown film process is used, with a bottom fan blowing air into the film to make it into a cylindrical plastic bag.

[0003] Chinese Patent No. CN218084048U discloses an extrusion device for a three-layer co-extrusion blown film machine, relating to the field of co-extrusion blown film machines. The extrusion device includes a blown film die head, an air intake fan for blown film is installed on one side of the bottom of the die head, an air intake seat is installed on the outer surface of the bottom end of the die head, an air intake pipe is fixedly installed at the output end of the air intake fan, and the other end of the air intake pipe is installed inside the air intake seat. A locking mechanism is provided at the inner top of the air intake seat, the locking mechanism including a locking strip and a locking screw, the locking strip being movably engaged with the outer surface of a clamping plate. By rotating the locking screw counterclockwise, the locking strip moves upward, causing the top of the clamping plate to flip outward and then be pulled outward, completing the disassembly of the air intake pipe, facilitating the removal of the air filter for cleaning or replacement.

[0004] However, the above technical solutions have the following drawbacks: Directly disassembling the filter element while the equipment is running will cause unfiltered air to directly enter the blown film machine, affecting the blown film quality. Therefore, operators need to force the machine to stop, wait for the air intake system to depressurize before disassembling the filter element, cleaning and replacing it, and then restarting the equipment. This operating mode has significant drawbacks: on the one hand, the shutdown process will interrupt the continuous operation of the equipment, and each shutdown will lead to a loss of production capacity and an extended production cycle; on the other hand, frequent shutdowns and restarts will increase equipment start-up and shutdown losses, shorten the equipment's service life, and consume additional start-up and shutdown energy, increasing operating costs. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a three-layer co-extrusion blown film machine.

[0006] The technical solution of this utility model: a three-layer co-extrusion blown film machine, comprising: The blown film machine die head has an air intake fan installed on one side of its bottom for blowing film; An air inlet pipe is installed between the air intake fan and the blown film machine die head. One end of the air inlet pipe is connected to the air outlet of the air intake fan, and the other end of the air inlet pipe is connected to the air inlet of the blown film machine die head. The mounting box is located between the blown film machine die head and the air intake fan, and both sides of the mounting box are equipped with sealing covers. The docking mechanism is provided in two sets, which are respectively located on both sides of the mounting box. One end of the docking mechanism is connected to the mounting box, and the other end of the docking mechanism is connected to the air inlet pipe. The filter mechanism is installed inside the mounting box to filter the air in the air inlet duct. The filter mechanism is movably installed inside the mounting box. An adjustment mechanism is installed on the mounting box, and its output end is connected to the filter mechanism to adjust the position of the filter mechanism.

[0007] Preferably, the filtration mechanism includes a mounting frame and a filter screen; the mounting frame is slidably disposed in the mounting box, and the mounting frame has two through holes; two filter screens are provided and correspond one-to-one with the through holes; the filter screens are detachably disposed in the through holes.

[0008] Preferably, each docking mechanism includes a docking cylinder, a movable cylinder, and a docking ring; one end of the docking cylinder is connected to the mounting box, and the other end of the docking cylinder is connected to the air inlet pipe; the movable cylinder is slidably disposed inside the docking cylinder, one end of the movable cylinder extends into the air inlet pipe and is slidably connected to the air inlet pipe; the docking ring is slidably disposed inside the docking cylinder and is fixedly connected to the movable cylinder.

[0009] Preferably, the docking cylinder is provided with multiple docking springs, one end of the docking spring is connected to the docking cylinder, and the other end of the docking spring is connected to the docking ring. The docking ring contacts the mounting frame under the action of the docking spring.

[0010] Preferably, the adjusting mechanism includes a connecting frame, an adjusting motor, an adjusting screw, and an adjusting sleeve; the connecting frame is fixedly connected to the top of the mounting box, the adjusting motor is fixedly connected to the connecting frame, the adjusting screw is rotatably disposed within the connecting frame, one end of the adjusting screw is connected to the output end of the adjusting motor, the adjusting sleeve is slidably disposed within the connecting frame, the adjusting sleeve is threadedly connected to the adjusting screw, and the adjusting sleeve is fixedly connected to the mounting frame.

[0011] Preferably, cleaning holes are provided through both sides of the installation box, and multiple sealing covers are provided, each corresponding to one of the cleaning holes. The sealing covers are used to seal the cleaning holes.

[0012] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects: This invention, through its adjustment mechanism and dual-filter design, allows for filter cleaning. When the filters need cleaning, the adjusting motor drives the adjusting screw to rotate, which in turn moves the mounting frame via the adjusting sleeve. This allows the working filter to be pushed out and the spare filter to be put into operation, enabling filter switching without stopping the machine. This avoids production capacity loss and extended production cycles caused by downtime, and reduces mechanical wear during equipment start-up and shutdown, extending the equipment's lifespan. It also avoids additional energy consumption during start-up and shutdown, reducing overall operating costs. The docking mechanism ensures the docking ring remains in contact with the mounting frame under the action of the docking spring, guaranteeing a sealed connection between the mounting box and the air inlet pipe during filter switching and equipment operation. This prevents unfiltered air from leaking into the system, maintaining filtration efficiency and equipment operational stability. Attached Figure Description

[0013] Figure 1 This is a perspective view of one embodiment of the present invention; Figure 2 This is a perspective view of the mounting box in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the mounting box in one embodiment of the present invention; Figure 4 This is a cross-sectional view of the docking mechanism in one embodiment of the present invention; Figure 5 This is a perspective view of the movable cylinder in one embodiment of the present invention; Reference numerals in the attached drawings: 1. Blown film machine die head; 21. Mounting frame; 22. Filter screen; 31. Docking cylinder; 32. Movable cylinder; 33. Docking ring; 34. Docking spring; 41. Connecting frame; 42. Adjusting motor; 43. Adjusting screw; 44. Adjusting sleeve; 5. Air inlet fan; 6. Air inlet pipe; 7. Mounting box; 8. Sealing cover. Detailed Implementation

[0014] Example 1; as Figure 1-5As shown, this utility model proposes a three-layer co-extrusion blown film machine, including a blown film die head 1, an air inlet pipe 6, a mounting box 7, a docking mechanism, a filtering mechanism, and an adjusting mechanism. An air inlet fan 5 for blown film is installed on one side of the bottom of the blown film die head 1. Three sets of extrusion mechanisms are provided at the feed inlet of the blown film die head 1. The air inlet fan 5 is connected to the control system and power supply via wires. The air inlet pipe 6 is located between the air inlet fan 5 and the blown film die head 1. One end of the air inlet pipe 6 is connected to the air outlet of the air inlet fan 5, and the other end is connected to the air inlet of the blown film die head 1. The mounting box 7 is located between the blown film die head 1 and the air inlet fan 5. Both sides of the mounting box 7 are equipped with sealing covers 8, and cleaning holes are opened through both sides of the mounting box 7. Multiple sealing covers 8 are provided, each corresponding to a cleaning hole, and the sealing covers 8 are used to seal the cleaning holes. Two sets of docking mechanisms are provided, one on each side of the mounting box 7. One end of the docking mechanism is connected to the mounting box 7, and the other end is connected to the air inlet pipe 6. The filter mechanism is set inside the mounting box 7 to filter the air in the air inlet pipe 6. The filter mechanism is movably set inside the mounting box 7. The adjustment mechanism is set on the mounting box 7, and the output end of the adjustment mechanism is connected to the filter mechanism to adjust the position of the filter mechanism.

[0015] Example 2; as Figure 3 As shown, the present invention proposes a three-layer co-extrusion blown film machine. Compared with Embodiment 1, this embodiment also specifically discloses the structure of the filter mechanism. The filter mechanism includes a mounting frame 21 and a filter screen 22. The mounting frame 21 is slidably disposed in the mounting box 7. The mounting frame 21 has two through holes. Two filter screens 22 are provided and correspond one-to-one with the through holes. The filter screens 22 are detachably disposed in the through holes.

[0016] Example 3; as Figure 2-5 As shown, this utility model proposes a three-layer co-extrusion blown film machine. Compared with Embodiment 2, this embodiment also specifically discloses the structure of the docking mechanism. Each docking mechanism includes a docking cylinder 31, a movable cylinder 32, and a docking ring 33. One end of the docking cylinder 31 is connected to the mounting box 7, and the other end of the docking cylinder 31 is connected to the air inlet pipe 6. The movable cylinder 32 is slidably disposed inside the docking cylinder 31. One end of the movable cylinder 32 extends into the air inlet pipe 6 and is slidably connected to the air inlet pipe 6. The docking ring 33 is slidably disposed inside the docking cylinder 31 and is fixedly connected to the movable cylinder 32. Multiple docking springs 34 are provided inside the docking cylinder 31. One end of the docking spring 34 is connected to the docking cylinder 31, and the other end of the docking spring 34 is connected to the docking ring 33. The docking ring 33 contacts the mounting frame 21 under the action of the docking spring 34.

[0017] Example 4; as Figure 2-3As shown, this utility model proposes a three-layer co-extrusion blown film machine. Compared with Embodiment 3, this embodiment also specifically discloses the structure of the adjustment mechanism. The adjustment mechanism includes a connecting frame 41, an adjustment motor 42, an adjustment screw 43, and an adjustment sleeve 44. The connecting frame 41 is fixedly connected to the top of the mounting box 7. The adjustment motor 42 is fixedly connected to the connecting frame 41. The adjustment motor 42 has forward and reverse rotation functions and is connected to the control system and power supply through wires. The adjustment screw 43 is rotatably disposed in the connecting frame 41. One end of the adjustment screw 43 is connected to the output end of the adjustment motor 42. The adjustment sleeve 44 is slidably disposed in the connecting frame 41. The adjustment sleeve 44 is threadedly connected to the adjustment screw 43 and is fixedly connected to the mounting frame 21.

[0018] Three sets of raw materials are fed into the blown film die head 1 through the extrusion mechanism to form a cylindrical co-extruded film. The air intake fan 5 delivers gas to the blown film die head 1 through the air intake pipe 6 to cool the formed co-extruded film. The gas passes through the mounting box 7 and is filtered by the filter screen 22 to ensure the quality of the air entering the blown film die head 1. When the filter screen 22 needs to be cleaned, the adjusting motor 42 drives the adjusting screw 43 to rotate. The rotation of the adjusting screw 43 drives the mounting frame 21 to move through the adjusting sleeve 44. The movement of the mounting frame 21 pushes out the working filter screen 22 and simultaneously puts the spare filter screen 22 into operation. The docking ring 33 is docked and sealed with the mounting frame 21 under the action of the docking spring 34.

[0019] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A three-layer co-extrusion blown film machine, characterized in that, include: The blown film machine die head (1) has an air intake fan (5) installed on one side of its bottom for blown film. An air inlet pipe (6) is installed between the air inlet fan (5) and the blown film die (1). One end of the air inlet pipe (6) is connected to the air outlet of the air inlet fan (5), and the other end of the air inlet pipe (6) is connected to the air inlet of the blown film die (1). The mounting box (7) is located between the blown film die head (1) and the air intake fan (5). Both sides of the mounting box (7) are equipped with sealing covers (8). The docking mechanism is provided in two sets. The docking mechanisms are respectively set on both sides of the mounting box (7). One end of the docking mechanism is connected to the mounting box (7), and the other end of the docking mechanism is connected to the air inlet pipe (6). The filter mechanism is installed in the mounting box (7) to filter the air in the air inlet pipe (6). The filter mechanism is movably installed in the mounting box (7). An adjustment mechanism is installed on the mounting box (7), and the output end of the adjustment mechanism is connected to the filter mechanism to adjust the position of the filter mechanism; The filtration mechanism includes a mounting frame (21) and a filter screen (22); the mounting frame (21) is slidably disposed in the mounting box (7), and the mounting frame (21) has two through holes. There are two filter screens (22) that correspond one-to-one with the through holes. The filter screens (22) are detachably disposed in the through holes.

2. The three-layer co-extrusion blown film machine according to claim 1, characterized in that, Each docking mechanism includes a docking cylinder (31), a movable cylinder (32), and a docking ring (33); one end of the docking cylinder (31) is connected to the mounting box (7), and the other end of the docking cylinder (31) is connected to the air inlet pipe (6). The movable cylinder (32) is slidably disposed inside the docking cylinder (31), and one end of the movable cylinder (32) extends into the air inlet pipe (6) and is slidably connected to the air inlet pipe (6). The docking ring (33) is slidably disposed inside the docking cylinder (31), and the docking ring (33) is fixedly connected to the movable cylinder (32).

3. A three-layer co-extrusion blown film machine according to claim 2, characterized in that, Multiple docking springs (34) are provided inside the docking cylinder (31). One end of the docking spring (34) is connected to the docking cylinder (31), and the other end of the docking spring (34) is connected to the docking ring (33). The docking ring (33) contacts the mounting frame (21) under the action of the docking spring (34).

4. A three-layer co-extrusion blown film machine according to claim 1, characterized in that, The adjustment mechanism includes a connecting frame (41), an adjustment motor (42), an adjustment screw (43), and an adjustment sleeve (44). The connecting frame (41) is fixedly connected to the top of the mounting box (7), the adjustment motor (42) is fixedly connected to the connecting frame (41), the adjustment screw (43) is rotatably disposed in the connecting frame (41), one end of the adjustment screw (43) is connected to the output end of the adjustment motor (42), the adjustment sleeve (44) is slidably disposed in the connecting frame (41), the adjustment sleeve (44) is threadedly connected to the adjustment screw (43), and the adjustment sleeve (44) is fixedly connected to the mounting frame (21).

5. A three-layer co-extrusion blown film machine according to claim 1, characterized in that, The mounting box (7) has cleaning holes through both sides. Multiple sealing covers (8) are provided and correspond one-to-one with the cleaning holes. The sealing covers (8) are used to seal the cleaning holes.

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