Filtering device of film blowing machine

Abstract

The utility model relates to the technical field of film blowing machines, and discloses a filtering device of a film blowing machine, which comprises a material conveying barrel, an impurity filtering component, a material conveying component, a material conveying component and a material conveying component, wherein the impurity filtering component is arranged in an annular seat and can intercept impurities in plastic melt; and the sealing assembly is arranged in the dismounting and replacing cavity and used for preventing the plastic melt from leaking out of the material conveying barrel. According to the utility model, impurities and particles which are not completely melted in a plastic melt are intercepted through the impurity filtering assembly, so that the plastic melt subsequently entering the die head is finer and smoother, and the stable quality of a plastic film is ensured; the plastic melt is prevented from leaking through the gap between the replacement cavity and the drawing block through the sealing assembly, and the sealing performance of the material conveying barrel is improved; and the whole drawing block is taken out from the interior of the replacement cavity through the quick disassembly assembly, so that the impurity filtering assembly can be quickly replaced, the replacement process is simplified, the replacement difficulty is reduced, and the labor load of workers is relieved.

Description

Technical Field

[0001] This utility model relates to the field of blown film machine technology, specifically a filtration device for a blown film machine. Background Technology

[0002] A blown film machine is a device that heats and melts plastic particles and blows them into a thin film. Its working principle is to add plastic raw materials into the hopper of an extruder, and then melt the plastic raw materials under high temperature and pressure to form a melt. The plastic melt is extruded through a die to form a continuous plastic film. After blowing, cooling and winding, the film production is completed. In order to ensure the stable quality of the plastic film, it is necessary to use filter components such as filter screens to remove impurities and particles from the plastic melt, so that the cooled and formed plastic film has a beautiful and smooth appearance.

[0003] When using the existing blown film machine's filtration device, impurities and particles in the plastic melt adhere to the filter screen. After a long period of plastic film production and processing, the plastic melt cannot flow normally into the die head due to the filter screen pores becoming clogged. At this time, it is necessary to disassemble and replace the filter screen. However, the filter screen is generally installed inside the extruder head with multiple bolts. Due to the limited space between the extruder and the die head, this installation method makes the operation steps for disassembling and installing the filter screen very cumbersome for the staff, and it cannot achieve quick replacement of the filter screen. This will affect the progress of plastic film production and processing. Utility Model Content

[0004] The purpose of this invention is to provide a filtration device for a blown film machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a filtering device for a blown film machine, comprising a feeding cylinder, a boss on the outer side of the feeding cylinder, a replacement cavity on the top of the boss, the feeding cylinder communicating with the outside through the replacement cavity, a pull block inside the replacement cavity, a filtering cavity inside the pull block, and an annular seat coaxially arranged inside the filtering cavity, further comprising:

[0006] A filter assembly is installed inside the annular seat to intercept impurities inside the plastic melt. A limiting component is provided on the outside of the annular seat to facilitate positioning and fixing the filter assembly inside the filter chamber. A positioning groove corresponding to the pull block is opened on the inner wall of the feed cylinder, and the pull block is located inside the positioning groove.

[0007] A sealing assembly is installed inside the replacement chamber to prevent the plastic melt from leaking to the outside of the feed cylinder. The top of the pull block extends through to the outside of the replacement chamber and is fixedly connected to a sealing cover plate. Both ends of the sealing cover plate are equipped with quick-release components that can speed up the replacement of the filter assembly.

[0008] Preferably, the impurity filtering assembly includes a filter screen fixed inside the annular seat, and at least three reinforcing rods are provided on both sides of the filter screen, the reinforcing rods being fixedly installed on the filter screen.

[0009] Preferably, the limiting component includes a retaining ring fixed at one end of the filter chamber, a limiting sleeve at the other end of the filter chamber, a plurality of mounting holes on the inner wall of the limiting sleeve, a fastening bolt at the bottom of the inner cavity of each mounting hole, one end of the fastening bolt being connected to the pull block, and a plug being installed at the top opening of the mounting hole.

[0010] Preferably, the sealing assembly includes sealing gaskets fixed to both sides of the pull-out block, and a sealing groove corresponding to the sealing gasket is formed on the inner wall of the replacement cavity, with the sealing gasket located inside the sealing groove.

[0011] Preferably, the quick-release assembly includes receiving cavities disposed inside both ends of the boss. A ball screw is provided inside the receiving cavity. One end of the ball screw is rotatably connected to the inner wall of the receiving cavity, and the other end of the ball screw extends through to the outside of the boss and is fixedly connected to a turntable. A movable block is helically connected to the outside of the ball screw. Through grooves are provided on both sides of the inner wall of the receiving cavity. A rotating shaft is fixedly connected to both sides of the movable block. One end of the rotating shaft extends through to the outside of the through groove. Limiting grooves are provided at the top of both ends of the sealing cover. A U-shaped frame is provided inside the limiting groove. The U-shaped frame is rotatably connected to the rotating shafts at both ends.

[0012] Preferably, a gripping handle is fixedly installed on the top of the sealing cover.

[0013] Preferably, both ends of the conveying cylinder are provided with connecting flanges.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention uses a filter assembly to intercept impurities and incompletely melted particles inside the plastic melt, thus making the plastic melt entering the die head finer and ensuring the stability of the plastic film quality. A sealing assembly prevents leakage of the plastic melt through the gap between the replacement chamber and the pull block, improving the sealing performance of the feed cylinder. A quick-release assembly allows the pull block to be removed entirely from the replacement chamber, enabling rapid replacement of the filter assembly, simplifying the replacement process, reducing the difficulty of replacement, and lessening the workload of the workers. Attached Figure Description

[0016] Figure 1 A schematic diagram of the filter device for the blown film machine provided by this utility model;

[0017] Figure 2 A schematic diagram of the quick-release component structure provided by this utility model;

[0018] Figure 3 This is a schematic diagram of the specific structure of the pull-out block provided by this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the feed cylinder provided by this utility model;

[0020] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle;

[0021] Figure 6 A schematic diagram of the limiting component structure provided by this utility model.

[0022] In the diagram: 1. Feed cylinder; 2. Connecting flange; 3. Boss; 4. Replacement chamber; 5. Pull-out block; 6. Filter chamber; 7. Filter assembly; 71. Reinforcing rod; 72. Filter screen; 8. Limiting assembly; 81. Retaining ring; 82. Limiting sleeve; 83. Mounting hole; 84. Fastening bolt; 85. Plug; 9. Sealing assembly; 91. Sealing groove; 92. Sealing gasket; 10. Sealing cover plate; 11. Grip handle; 12. Quick release assembly; 121. Receiving chamber; 122. Ball screw; 123. Moving block; 124. Through groove; 125. Rotating shaft; 126. U-shaped frame; 127. Limiting groove; 128. Turntable; 13. Positioning groove; 14. Annular seat. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-6As shown, a filtering device for a blown film machine includes a feeding cylinder 1, a boss 3 on the outer side of the feeding cylinder 1, a replacement chamber 4 on the top of the boss 3, the feeding cylinder 1 being connected to the outside through the replacement chamber 4, a pull block 5 inside the replacement chamber 4, a filtering chamber 6 inside the pull block 5, and an annular seat 14 coaxially inside the filtering chamber 6. The device also includes a filter assembly 7 disposed inside the annular seat 14 to intercept impurities within the plastic melt. By setting the filter assembly 7, impurities and incompletely melted particles inside the plastic melt can be intercepted, thus making the plastic melt finer and ensuring stable quality of the plastic film. A limiting component 8 is provided on the outer side of the annular seat 14 to facilitate positioning and fixing the filter assembly 7 inside the filtering chamber 6. By setting the limiting component 8, it is convenient for operators to position and fix the filter assembly 7 inside the filtering chamber 6. The positioning is installed inside the filter chamber 6 to facilitate the subsequent replacement of the filter assembly 7. The inner wall of the feed cylinder 1 is provided with a positioning groove 13 corresponding to the pull block 5, and the pull block 5 is located inside the positioning groove 13. A sealing assembly 9 is set inside the replacement chamber 4 to prevent the plastic melt from leaking to the outside of the feed cylinder 1. By setting the sealing assembly 9, the sealing performance of the feed cylinder 1 can be improved, thus preventing the plastic melt from leaking through the gap between the replacement chamber 4 and the pull block 5. The top of the pull block 5 extends through to the outside of the replacement chamber 4 and is fixedly connected to a sealing cover plate 10. Both ends of the sealing cover plate 10 are provided with quick-release components 12 to speed up the replacement of the filter assembly 7. By setting the quick-release components 12, the entire pull block 5 inside the feed cylinder 1 can be quickly replaced, thereby improving the replacement speed of the filter assembly 7.

[0025] The impurity filtering assembly 7 includes a filter screen 72 fixed inside the annular seat 14. At least three reinforcing rods 71 ​​are provided on both sides of the filter screen 72, and the reinforcing rods 71 ​​are fixedly installed on the filter screen 72. Figure 3 , Figure 6 As shown, by setting the reinforcing rod 71, the overall support strength of the filter screen 72 can be improved, making it less likely to deform and fall apart when squeezed by the plastic melt. Then, the filter screen 72 is used to intercept impurities and incompletely melted particles inside the plastic melt, thus ensuring the stable quality of the plastic film.

[0026] The limiting component 8 includes a retaining ring 81 fixed at one end of the filter chamber 6, and a limiting sleeve 82 at the other end of the filter chamber 6. Multiple mounting holes 83 are formed on the inner wall of the limiting sleeve 82. Each mounting hole 83 has a fastening bolt 84 at its bottom. One end of the fastening bolt 84 is connected to the pull-out block 5. A plug 85 is installed at the top opening of the mounting hole 83. Figure 5 , Figure 6 As shown, by setting the mounting hole 83 and fastening bolt 84, the limiting sleeve 82 can be easily fixedly installed inside the filter chamber 6. After the limiting sleeve 82 is installed, the retaining ring 81 can be used to firmly position and fix the annular seat 14 and its internal filter assembly 7, thus realizing the installation of the filter assembly 7.

[0027] The sealing assembly 9 includes sealing gaskets 92 fixed to both sides of the pull-out block 5. A sealing groove 91 corresponding to the sealing gasket 92 is formed on the inner wall of the replacement cavity 4. The sealing gasket 92 is located inside the sealing groove 91. Figure 5 , Figure 6 As shown, the sealing gasket 92 is pressed tightly into the sealing groove 91 by the pull-out block 5, which can prevent the plastic melt from leaking through the gap between the replacement chamber 4 and the pull-out block 5.

[0028] The quick-release assembly 12 includes receiving cavities 121 located inside both ends of the boss 3. A ball screw 122 is installed inside each receiving cavity 121. One end of the ball screw 122 is rotatably connected to the inner wall of the receiving cavity 121, and the other end of the ball screw 122 extends through to the outside of the boss 3 and is fixedly connected to a turntable 128. A movable block 123 is helically connected to the outer side of the ball screw 122. Through grooves 124 are provided on both sides of the inner wall of the receiving cavity 121. Rotating shafts 125 are fixedly connected to both sides of the movable block 123. One end of the rotating shaft 125 extends through to the outside of the through groove 124. Limiting grooves 127 are provided at the top of both ends of the sealing cover plate 10. U-shaped brackets 126 are provided inside the limiting grooves 127, and the U-shaped brackets 126 are rotatably connected to the rotating shafts 125 at both ends. Figure 2 , Figure 3 As shown, when the filter assembly 7 needs to be cleaned, maintained, or replaced, the turntable 128 can be used to drive the ball screw 122 to rotate. The ball screw 122 then drives the moving block 123 to rise as a whole. At this time, the rotation space between the U-shaped frame 126 and the limiting groove 127 gradually increases. Then, the U-shaped frame 126 is flipped down, the sealing cover 10 is no longer restricted, and the pull-out block 5 can be freely removed from the inside of the replacement chamber 4. This achieves quick replacement of the filter assembly 7, simplifies the replacement process, reduces the difficulty of replacement, and reduces the workload of the staff.

[0029] A gripping handle 11 is fixedly installed on the top of the sealing cover 10, such as... Figure 2 , Figure 3 As shown, by setting a gripping handle 11, it is easier for staff to pull the filter assembly 7 out of the replacement chamber 4, thus improving its practicality.

[0030] Both ends of the conveyor cylinder 1 are equipped with mating flanges 2, such as Figure 1 As shown, in actual use, the feed cylinder 1 can be connected to the extruder head and die head respectively through the flanges 2 at both ends. The extruder head will squeeze the plastic melt into the feed cylinder 1, and the filter assembly 7 will remove the impurities inside the plastic melt. Then the plastic melt enters the die head to form a film. After the film is cooled and shaped, it can be wound up.

[0031] Working principle: First, the operator connects the flanges 2 at both ends of the feed cylinder 1 to the extruder head and die head respectively. After the plastic melt is extruded into the feed cylinder 1, the filter assembly 7 intercepts impurities and incompletely melted particles inside the plastic melt, thus making the plastic melt entering the die head more delicate and ensuring the stable quality of the plastic film. During this process, the sealing assembly 9 prevents the plastic melt from leaking through the gap between the replacement chamber 4 and the pull block 5, improving the sealing performance of the feed cylinder 1. After a long period of plastic film production and processing, the pull block 5 can be removed from the replacement chamber 4 as a whole through the quick-release assembly 12, thus realizing the quick replacement of the filter assembly 7, simplifying the replacement process, reducing the difficulty of replacement, and reducing the workload of the operator.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filtering device for a blown film machine, comprising a feed cylinder (1), characterized in that, The feed cylinder (1) has a boss (3) on its outer side, and a replacement cavity (4) is opened on the top of the boss (3). The feed cylinder (1) is connected to the outside through the replacement cavity (4). A pull block (5) is provided inside the replacement cavity (4). A filter cavity (6) is opened inside the pull block (5). An annular seat (14) is coaxially provided inside the filter cavity (6). The feed cylinder (1) also includes: A filter assembly (7) is set inside the annular seat (14) to intercept impurities inside the plastic melt. A limiting assembly (8) is provided on the outside of the annular seat (14) to facilitate positioning and fixing the filter assembly (7) inside the filter chamber (6). A positioning groove (13) corresponding to the pull block (5) is opened on the inner wall of the feed cylinder (1). The pull block (5) is located inside the positioning groove (13). A sealing assembly (9) is installed inside the replacement chamber (4) to prevent the plastic melt from leaking to the outside of the feed cylinder (1). The top of the pull block (5) extends through to the outside of the replacement chamber (4) and is fixedly connected to a sealing cover plate (10). Both ends of the sealing cover plate (10) are provided with quick-release assemblies (12) that can speed up the replacement of the filter assembly (7).

2. The filtration device for a blown film machine according to claim 1, characterized in that: The filter assembly (7) includes a filter screen (72) fixed inside the annular seat (14). The filter screen (72) has no less than three reinforcing rods (71) on both sides, and the reinforcing rods (71) are fixedly installed on the filter screen (72).

3. The filtration device for a blown film machine according to claim 1, characterized in that: The limiting component (8) includes a retaining ring (81) fixed at one end of the filter chamber (6), and a limiting sleeve (82) provided at the other end of the filter chamber (6). The inner wall of the limiting sleeve (82) is provided with multiple mounting holes (83). Each mounting hole (83) has a fastening bolt (84) at the bottom of its inner cavity. One end of the fastening bolt (84) is connected to the pull block (5). A plug (85) is installed at the top opening of the mounting hole (83).

4. The filtration device for a blown film machine according to claim 1, characterized in that: The sealing assembly (9) includes sealing gaskets (92) fixed on both sides of the pull-out block (5), and a sealing groove (91) corresponding to the sealing gasket (92) is provided on the inner wall of the replacement cavity (4), with the sealing gasket (92) located inside the sealing groove (91).

5. The filtration device for a blown film machine according to claim 1, characterized in that: The quick-release assembly (12) includes receiving cavities (121) disposed inside both ends of the boss (3). A ball screw (122) is provided inside the receiving cavity (121). One end of the ball screw (122) is rotatably connected to the inner wall of the receiving cavity (121), and the other end of the ball screw (122) extends through to the outside of the boss (3) and is fixedly connected to a turntable (128). A moving block (123) is spirally connected to the outside of the ball screw (122). Both sides of the inner wall of the receiving cavity (121) are provided with through grooves (124), and both sides of the moving block (123) are fixedly connected with rotating shafts (125). One end of the rotating shaft (125) extends through to the outside of the through groove (124). Both ends of the sealing cover plate (10) are provided with limiting grooves (127). The limiting grooves (127) are provided with U-shaped frames (126) inside. The U-shaped frames (126) are rotatably connected to the rotating shafts (125) at both ends respectively.

6. The filtration device for a blown film machine according to claim 1, characterized in that: A grip handle (11) is fixedly installed on the top of the sealing cover (10).

7. The filtration device for a blown film machine according to claim 1, characterized in that: Both ends of the conveying cylinder (1) are provided with connecting flanges (2).

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