Extrusion device of three-layer co-extrusion film blowing machine

Abstract

The utility model discloses an extrusion device of a three-layer co-extrusion film blowing machine, which belongs to the technical field of film blowing machines, and comprises a film blowing machine die head, a plurality of air inlet fans and a plurality of filter boxes, the two ends of each filter box are respectively and fixedly connected with an adjusting box, and the two sides of each filter box are respectively provided with a filter channel. A plurality of clamping grooves are formed in inner cavities of the two filtering channels, and the inner sides of the clamping grooves are sleeved with filtering cotton. According to the utility model, the two filtering channels are arranged on the filtering box, the filtering cotton is arranged in the two filtering channels, the two three-way valves are arranged at the two ends of the filtering box, and the flowing direction of gas is controlled through the three-way valves, so that the gas flows from the two different filtering channels regularly; and when gas flows in one filtering channel, the sealing plate in the inner cavity of the other filtering channel can be pulled out to take out the filtering cotton for dust removal and replacement, so that the continuity of gas supply to the die head of the film blowing machine is ensured, and the practicability is good.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, and more specifically, to an extrusion device for 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] A search revealed that utility model patent CN220638821U discloses an extrusion device for a three-layer co-extrusion blown film machine. The device includes a blown film die head, an adjustment device on one side of the die head, and an air inlet pipe movably nested on one side of the adjustment device. The air inlet pipe is movably nested on one side of an air intake fan. The adjustment device includes a fixing device and a filtering device. A conveying pipe is nested on one side of the air inlet pipe. Fixing devices are symmetrically arranged on the outer walls of the air inlet pipe and the conveying pipe. Each fixing device includes an adjustment box, an adjustment rod, a fixing ring, a first limiting groove, a sealing strip, a connecting plate, a placement groove, and a fixing block. The adjustment box is welded to one side of the blown film die head, and the adjustment rod is symmetrically threaded to both sides of the outer wall of the adjustment box. This extrusion device for a three-layer co-extrusion blown film machine, when locked and sealed, can completely fit with the air inlet pipe and the conveying pipe, preventing air leakage and achieving a complete sealing and locking effect. However, the above patents still have the following shortcomings: as the filter element passes through the gas, dust will affect the airflow speed. Cleaning and replacing the filter element requires stopping the machine, which affects the operation of the blown film machine. Furthermore, the convenience of fixing the air inlet pipe and the delivery pipe by rotating the two rotating rods to drive the two fixing rings is not good. At the same time, it does not have a locking function, and the fixing rings and rotating rods are prone to loosening, affecting the connection stability. Therefore, we propose an extrusion device for a three-layer co-extrusion blown film machine. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of this utility model is to provide an extrusion device for a three-layer co-extrusion blown film machine.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] An extrusion device for a three-layer co-extrusion blown film machine includes a blown film die head, multiple air inlet fans, and multiple filter boxes. Adjustment boxes are fixedly connected to both ends of each filter box. Filter channels are provided on both sides of each filter box. Multiple slots are provided within the inner cavities of both filter channels, and filter cotton is fitted inside each slot. Two slots are formed on the top surface of the filter box. Fixing grooves are provided on the bottom surfaces of the inner cavities of both filter channels. Sealing plates are fitted inside the inner cavities of the slots, with the bottom ends of the sealing plates movably fitted into the inner cavities of the fixing grooves. The filter boxes are located at both ends and are positioned between two adjustment boxes. The inner cavities of the two filter channels are respectively fixedly fitted with three-way valves. The two ends of the two three-way valves extend to the inner cavities of the two filter channels respectively. The third ends of the two three-way valves are fixedly connected with second flanges. The inner cavities of the two regulating boxes are provided with snap-fit ​​mechanisms. The side of the blown film die head is provided with multiple air inlet pipes. The ends of the multiple air inlet pipes are fixedly connected with third flanges. The third flanges are connected to a second flange. The output end of the air inlet fan is fixedly connected with an air guide pipe. The end of the air guide pipe is fixedly connected with a first flange. The first flange is connected to another second flange.

[0007] As a preferred embodiment of this utility model, the locking mechanism includes a worm gear rotatably connected to the inner cavity of the regulating box, a double-acting screw, and a slide rod fixedly sleeved in the inner cavity of the regulating box. Clamp sleeves are threaded onto the outer sides of both ends of the double-acting screw, and the bottom ends of the two clamp sleeves are movably sleeved with the slide rod. A worm wheel is fixedly sleeved onto the outer side of one end of the double-acting screw, and the worm wheel and the worm gear mesh with each other. The top end of the worm gear extends to the top of the regulating box and is fixedly connected to a knob.

[0008] In a preferred embodiment of this utility model, the outer diameters of the third flange, the first flange, and the second flange are equal, and the inner diameter of the clamp sleeve is equal to the outer diameters of the third flange, the first flange, and the second flange, respectively.

[0009] As a preferred embodiment of this utility model, both adjustment boxes are hinged to the top with adjustment doors.

[0010] In a preferred embodiment of this utility model, the side of the filter cotton is respectively attached to the inner wall of the filter channel and the inner side of the sealing plate.

[0011] In a preferred embodiment of this utility model, the side of the sealing plate is respectively attached to the inner wall of the slot and the fixing groove.

[0012] Compared with existing technologies, the advantages of this utility model are:

[0013] (1) In this utility model, two filter channels are set on the filter box, and filter cotton is set inside both filter channels. In addition, two three-way valves are set at both ends of the filter box. The flow direction of the gas is controlled by the three-way valves, so that the gas flows from the two different filter channels at regular intervals. When the gas flows in one filter channel, the sealing plate of the inner cavity of the other filter channel can be pulled out to remove the filter cotton for cleaning and replacement, so as to ensure the continuity of the gas supply to the blown film die head.

[0014] (2) In this utility model, when the second flange and the third flange, or the second flange and the first flange are connected, the knob is turned to drive the worm to rotate. The meshing transmission between the worm and the worm wheel drives the bidirectional screw to rotate. The threaded engagement between the bidirectional screw and the two clamp sleeves drives the two clamp sleeves to move closer to each other. The two clamp sleeves are used to connect the second flange and the third flange, or the second flange and the first flange, respectively, ensuring the convenience of connection. The self-locking advantage between the worm and the worm wheel is used to prevent the clamp sleeves from loosening, ensuring the stability of the connection. It has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the blown film machine die head of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the air guide duct of this utility model;

[0018] Figure 4 This is a schematic diagram of the snap-fit ​​mechanism of this utility model;

[0019] Figure 5 This is a schematic diagram showing the disassembled filter box, filter cotton, and sealing plate of this utility model;

[0020] Figure 6 This is a cross-sectional schematic diagram of the regulating box of this utility model;

[0021] Figure 7 This is a schematic diagram of the internal structure of the filter channel of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1. Blown film die head; 2. Air inlet fan; 3. Filter box; 4. Adjustment box; 5. Filter channel; 6. Slot; 7. Filter cotton; 8. Slot; 9. Fixing slot; 10. Sealing plate; 11. Three-way valve; 12. Second flange; 13. Snap-fit ​​mechanism; 14. Air inlet pipe; 15. Third flange; 16. Air guide pipe; 17. First flange; 18. Two-way lead screw; 19. Slide rod; 20. Worm gear; 21. Clamp sleeve; 22. Worm wheel; 23. Knob; 24. Adjustment door. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example:

[0028] Please see Figure 1-7An extrusion device for a three-layer co-extrusion blown film machine includes a blown film die head 1, multiple air inlet fans 2, and multiple filter boxes 3. Adjustment boxes 4 are fixedly connected to both ends of the filter boxes 3. Filter channels 5 are provided on both sides of the filter boxes 3. Multiple slots 6 are provided inside the cavities of both filter channels 5. Filter cotton 7 is fitted inside the slots 6. Two slots 8 are opened on the top surface of the filter boxes 3. Fixed grooves 9 are provided on the bottom surfaces of the cavities of both filter channels 5. Sealing plates 10 are fitted inside the cavities of the slots 8, and the bottom ends of the sealing plates 10 are movably fitted into the cavities of the fixed grooves 9. The two ends of the filter boxes 3 are located within the cavities of the two adjustment boxes 4 respectively. Two three-way valves 11 are fixedly connected, with both ends of the two three-way valves 11 extending into the inner cavity of the two filter channels 5 respectively. The third end of each of the two three-way valves 11 is fixedly connected to a second flange 12. The inner cavity of each of the two regulating boxes 4 is provided with a snap-fit ​​mechanism 13. Multiple air inlet pipes 14 are provided on the side of the blown film die head 1. The ends of the multiple air inlet pipes 14 are fixedly connected to a third flange 15. The third flange 15 is connected to a second flange 12. The output end of the air inlet fan 2 is fixedly connected to an air guide pipe 16. The end of the air guide pipe 16 is fixedly connected to a first flange 17. The first flange 17 is connected to another second flange 12.

[0029] For details, please refer to Figure 4 The locking mechanism 13 includes a worm 20 rotatably connected to the inner cavity of the regulating box 4, a double-acting screw 18, and a slide rod 19 fixedly sleeved in the inner cavity of the regulating box 4. The outer sides of both ends of the double-acting screw 18 are respectively threaded with clamp sleeves 21, and the bottom ends of the two clamp sleeves 21 are respectively movably sleeved with the slide rod 19. A worm wheel 22 is fixedly sleeved on the outer side of one end of the double-acting screw 18. The worm wheel 22 and the worm 20 mesh with each other. The top end of the worm 20 extends to the top of the regulating box 4 and is fixedly connected with a knob 23.

[0030] In this embodiment, the worm 20 and the worm wheel 22 have a self-locking advantage, ensuring that only the worm 20 can drive the worm wheel 22 to rotate, while the worm wheel 22 cannot drive the worm 20 to rotate, thus ensuring the stability of the clamp sleeve 21 in connecting the second flange 12 and the first flange 17, and the second flange 12 and the third flange 15.

[0031] For details, please refer to Figure 2 , Figure 3 and Figure 6 The outer diameters of the third flange 15, the first flange 17, and the second flange 12 are equal, and the inner diameter of the clamp sleeve 21 is equal to the outer diameters of the third flange 15, the first flange 17, and the second flange 12, respectively.

[0032] In this embodiment, the second flange 12 and the first flange 17, and the second flange 12 and the third flange 15 can be stably fitted into the inner cavity of the two clamp sleeves 21, so as to achieve a stable connection between the second flange 12 and the first flange 17, and the second flange 12 and the third flange 15.

[0033] For details, please refer to Figure 5 Both adjustment boxes 4 have adjustment doors 24 hinged to their tops.

[0034] In this embodiment, the regulating door 24 can be installed by a hovering hinge or a spring hinge, and the three-way valve 11 inside the regulating box 4 can be adjusted by opening the regulating door 24.

[0035] For details, please refer to Figure 5 The sides of the filter cotton 7 are respectively attached to the inner wall of the filter channel 5 and the inner side of the sealing plate 10.

[0036] In this embodiment, the stability of the filter cotton 7 within the filter channel 5 is ensured, while also ensuring that the filter cotton 7 can filter all gases.

[0037] For details, please refer to Figure 4 , Figure 5 and Figure 7 The sides of the sealing plate 10 are respectively attached to the inner walls of the slot 8 and the fixing slot 9.

[0038] In this embodiment, the sealing and stability of the sealing plate 10 inserted into the slot 8 and the fixing groove 9 are ensured.

[0039] Working principle: In use, firstly, the third flange 15 at the end of the air inlet pipe 14 and the second flange 12 inside the regulating box 4 are brought into contact. Turning a knob 23 rotates the worm gear 20, which in turn drives the double-acting screw 18 to rotate through the meshing transmission between the worm gear 20 and the worm wheel 22. The threaded engagement between the double-acting screw 18 and the two clamp sleeves 21 brings the two clamp sleeves 21 closer together, causing the second flange 12 and the third flange 15 to fit inside the two clamp sleeves 21, thus connecting the second flange 12 and the third flange 15. Similarly, the first flange 17 at the end of the air guide pipe 16 is brought into contact with the second flange 12 inside the regulating box 4, and another set of clamp sleeves 21 is used to connect the first flange 17 and the second flange 12. Start the air intake fan 2 to draw external air into the inner cavity of the air duct 16, and allow the air in the air duct 16 to enter a filter channel 5 through a three-way valve 11. The air is filtered by the filter cotton 7 in the inner cavity of the filter channel 5. The filtered air is discharged into the air intake pipe 14 through another three-way valve 11. The air is then guided into the blown film die head 1 through the air intake pipe 14 for blown film operation. Finally, open the regulating door 24 at regular intervals to adjust the two three-way valves 11, allowing the air to enter another filter channel 5. The air is then filtered by the filter cotton 7 in the other filter channel 5. At this time, the sealing plate 10 in the inner cavity of the first filter channel 5 can be removed to replace and clean the filter cotton 7.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. An extrusion device for a three-layer co-extrusion blown film machine, comprising a blown film die (1), multiple air inlet fans (2), and multiple filter boxes (3), characterized in that: The filter box (3) is fixedly connected to two regulating boxes (4) at both ends. Filter channels (5) are provided on both sides of the filter box (3). Multiple slots (6) are provided in the inner cavity of each of the two filter channels (5). Filter cotton (7) is sleeved on the inner side of each of the multiple slots (6). Two slots (8) are opened on the top surface of the filter box (3). Fixed grooves (9) are provided on the bottom surface of the inner cavity of each of the two filter channels (5). A sealing plate (10) is sleeved in the inner cavity of the slot (8). The bottom end of the sealing plate (10) is movably sleeved into the inner cavity of the fixed groove (9). Three-way valves (11) are fixedly sleeved at both ends of the filter box (3) and in the inner cavities of the two regulating boxes (4). Both ends of the door (11) extend into the inner cavity of the two filter channels (5), and the third ends of the two three-way valves (11) are fixedly connected to the second flange (12). The inner cavities of the two regulating boxes (4) are provided with snap-fit ​​mechanisms (13). The side of the blown film die head (1) is provided with multiple air inlet pipes (14). The ends of the multiple air inlet pipes (14) are fixedly connected to the third flange (15). The third flange (15) is connected to a second flange (12). The output end of the air inlet fan (2) is fixedly connected to the air guide pipe (16). The end of the air guide pipe (16) is fixedly connected to the first flange (17). The first flange (17) is connected to another second flange (12).

2. The extrusion device of a three-layer co-extrusion blown film machine according to claim 1, characterized in that: The locking mechanism (13) includes a worm (20) rotatably connected to the inner cavity of the regulating box (4), a double-acting screw (18), and a slide rod (19) fixedly sleeved in the inner cavity of the regulating box (4). The outer sides of both ends of the double-acting screw (18) are respectively threaded with clamp sleeves (21). The bottom ends of the two clamp sleeves (21) are respectively movably sleeved with the slide rod (19). The outer side of one end of the double-acting screw (18) is fixedly sleeved with a worm wheel (22). The worm wheel (22) and the worm (20) mesh with each other. The top end of the worm (20) extends to the top of the regulating box (4) and is fixedly connected with a knob (23).

3. The extrusion device of a three-layer co-extrusion blown film machine according to claim 2, characterized in that: The outer diameters of the third flange (15), the first flange (17), and the second flange (12) are equal, and the inner diameter of the clamp sleeve (21) is equal to the outer diameters of the third flange (15), the first flange (17), and the second flange (12), respectively.

4. The extrusion device of a three-layer co-extrusion blown film machine according to claim 1, characterized in that: Both of the regulating boxes (4) have regulating doors (24) hinged to their tops.

5. The extrusion device of a three-layer co-extrusion blown film machine according to claim 1, characterized in that: The side of the filter cotton (7) is in contact with the inner wall of the filter channel (5) and the inner side of the sealing plate (10), respectively.

6. The extrusion device of a three-layer co-extrusion blown film machine according to claim 1, characterized in that: The side of the sealing plate (10) is respectively attached to the inner wall of the slot (8) and the fixing groove (9).

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