Self-cleaning device for filter screen of screw extruder

Abstract

The invention relates to the technical field of screw extruders, in particular to a screw extruder filter screen self-cleaning device which comprises a screw extruder body. A screen changing mechanism is arranged on the screw extruder body, and a filtering mechanism and a cleaning mechanism are arranged on the screen changing mechanism; the screen replacing mechanism comprises a shell, the shell is fixedly connected to the screw extruder body, a replacing groove is formed in the shell, a sealing shell is fixedly connected to the shell, and a supporting frame is slidably connected to the interior of the sealing shell. The arranged screen replacing mechanism can automatically replace the filter screen, so that when the internal pressure rises to a set value due to blockage of the filter screen, the driving device can be used for driving the supporting frame to move, the filter screen is moved and replaced, and manual operation of workers is reduced. And the arranged cleaning mechanism can form high pressure in the shell through gas continuously pumped by an air pump, impurities stored in the shaping rod can be cleaned through the high pressure, and dismounting and replacing operation on the screen is avoided.

Description

Technical Field

[0001] This invention relates to the field of screw extruder technology, specifically to a self-cleaning device for screw extruder filters. Background Technology

[0002] Screw extruders, as core equipment in polymer material processing, are widely used in continuous production processes in plastics, rubber, and chemical fibers. Their core working principle involves heating and melting solid materials through the rotating extrusion action of the screw, then pushing them into the forming die. However, impurities in the molten material can severely affect product quality and even damage precision components such as the screw and die. Therefore, filter assemblies, as key filtration units in screw extruders, are typically installed along the path of the molten material to remove impurities through physical interception, ensuring continuous production and stable product quality. However, a major problem faced by filter assemblies during use is clogging and failure: as filtration time increases, intercepted impurities gradually accumulate within the filter pores or on the surface, leading to increased melt flow resistance, decreased melt flow rate, and even filter rupture or equipment shutdown due to localized pressure overload.

[0003] Therefore, filters need to be replaced or cleaned after a period of use. Existing technologies require disassembling and manually cleaning the filters after replacement, necessitating repeated disassembly and reassembly by operators, thus affecting the efficiency of filter use or replacement. In view of this, we propose a self-cleaning device for screw extruder filters. Summary of the Invention

[0004] The purpose of this invention is to provide a self-cleaning device for screw extruder filters, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A self-cleaning device for a screw extruder filter screen includes a screw extruder body; The screw extruder body is equipped with a screen changing mechanism, which includes a filtering mechanism and a cleaning mechanism. The screen changing mechanism includes a housing, which is fixedly connected to the screw extruder body. A changing slot is provided on the housing. A sealing shell is fixedly connected to the housing. A support frame is slidably connected inside the sealing shell. The screen changing mechanism also includes a drive device for controlling the movement and switching of the support frame.

[0006] Preferably, the filtration mechanism includes a filter screen, which is detachably connected to a support frame. The filter screen has a ring structure, and a shaping frame is fixedly connected to the filter screen. A driving block is connected in the middle of the shaping frame.

[0007] Preferably, the shaping frame includes a shaping ring fixedly connected to the middle of the filter screen and a shaping rod fixedly connected to the outside of the shaping ring, wherein the shaping rod is a straight structure or an arc-shaped structure.

[0008] Preferably, the drive block has a hollow internal structure, and corresponding slag discharge holes are provided on the side of the drive block and the shaping frame, and a through hole is provided at one end of the drive block.

[0009] Preferably, a connecting rod is connected inside the shaping frame, and a connecting rod is slidably connected inside the driving block, with the end of the connecting rod abutting against the driving block.

[0010] Preferably, the inner side of the support frame is a sloping structure, a positioning plate is fixedly connected to the support frame, a groove corresponding to the filter screen structure is opened inside the support frame, and a pressure relief valve is connected to the support frame.

[0011] Preferably, the cleaning mechanism includes a cleaning hole, which is opened on one side of the sealing shell. A protective sleeve is fixedly connected to the outside of the cleaning hole, and a heating tube is slidably connected inside the protective sleeve. A heating component is provided inside the protective sleeve.

[0012] Preferably, the heating assembly includes a heating rod, which is fixedly connected to the protective sleeve. A limiting plate is fixedly connected to the side of the heating tube, and the heating rod passes through the limiting plate. Corresponding contact springs are fixedly connected to the side of the limiting plate and the inside of the protective sleeve.

[0013] Preferably, the cleaning mechanism further includes an air pump, which is connected to the heating tube via a pipe. The pipe is equipped with a solenoid valve. A drive frame is fixedly connected to the end of the heating tube. An electric push rod is fixedly connected to the side of the outer casing. The output end of the electric push rod is fixedly connected to the drive frame.

[0014] By employing the above technical solution, the present invention provides a screw extruder filter screen self-cleaning device that has at least the following beneficial effects: (1) The present invention can automatically replace the filter screen through the screen replacement mechanism. When the filter screen is blocked and the internal pressure rises to a set value, the support frame can be moved by the drive device to replace the filter screen, thereby reducing the manual operation of the staff and improving the replacement efficiency of the filter screen.

[0015] (2) The present invention can form several independent storage cavities through the set shape frame structure. At the same time, when the filter screen filters the material, it is driven by the screw to rotate, so that the material and the filter screen can rotate relative to each other. The material can move the impurities into the shape rod, which is convenient for temporary treatment of impurities and reduces the blockage of the screen holes by large particles of impurities.

[0016] (3) The present invention can use the gas continuously pumped in by the air pump to form high pressure inside the shell through the cleaning mechanism, so that the impurities stored inside the shaping rod can be cleaned by the high pressure, avoiding the disassembly and replacement of the screen. At the same time, the heating component can continuously heat the heating tube, so that the internal air can be kept at the set temperature, avoiding the inconvenience of cleaning caused by the solidification of materials on the filter screen. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention, form part of this application: Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the internal structure of the present invention. Figure 2 ; Figure 5 In this invention Figure 4 Enlarged diagram of point A.

[0018] Figure 6 This is a schematic diagram of the support frame structure of the present invention; Figure 7 This is a schematic diagram of the filter structure of the present invention.

[0019] In the diagram: 1. Screw extruder body; 2. Screen changing mechanism; 21. Outer shell; 22. Changing slot; 23. Support frame; 24. Positioning plate; 25. Sealing shell; 3. Filtering mechanism; 31. Filter screen; 32. Shaping frame; 321. Shaping ring; 322. Shaping rod; 33. Drive block; 34. Slag discharge hole; 35. Through hole; 36. Connecting rod; 4. Cleaning mechanism; 41. Cleaning hole; 42. Protective sleeve; 43. Heating tube; 44. Heating assembly; 441. Heating rod; 442. Limiting plate; 443. Contact spring; 45. Air pump; 47. Drive frame. Detailed Implementation

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

[0021] Example 1 A self-cleaning device for screw extruder filter screen, such as Figures 1-4 , Figure 6 As shown, it includes a screw extruder body 1; the screw extruder body 1 is provided with a screen changing mechanism 2, which can drive and replace the support structure of the filter screen 31.

[0022] Specifically, the screen changing mechanism 2 includes a housing 21, which is fixedly connected to the screw extruder body 1. A changing groove 22 is provided on the housing 21, and a sealing shell 25 is fixedly connected to the housing 21. A support frame 23 is slidably connected inside the sealing shell 25. The structure of the changing groove 22 allows for easy movement and replacement of the support frame 23, thereby enabling automatic replacement when the filter screen 31 becomes clogged. The screen changing mechanism 2 also includes a drive device for controlling the movement and switching of the support frame 23. The drive device is a pneumatic cylinder or a hydraulic cylinder. In this solution, the drive device is a hydraulic cylinder. The screen changing mechanism 2 also includes a sensor for detecting the pressure of the molten material inside the screw extruder to monitor the clogging status of the filter screen 31 in real time.

[0023] Example 2 like Figure 3 , Figures 5-7 As shown, based on Example 1, the screen changing mechanism 2 is equipped with a filter mechanism 3, which can filter the molten material and separate impurities such as sand from the material.

[0024] In this embodiment, the filtering mechanism 3 includes a filter screen 31, which is detachably connected to the support frame 23. The filter screen 31 has an annular structure, and a shaping frame 32 is fixedly connected to the filter screen 31. A driving block 33 is connected in the middle of the shaping frame 32. There are two driving blocks 33, and one driving block 33 is nested inside the other driving block 33. The annular structure of the filter screen 31 can be easily matched with the internal structure of the screw extruder. At the same time, the structure of the shaping frame 32 can support the screen. The shaping frame 32 includes a shaping ring 321 fixedly connected in the middle of the filter screen 31 and a shaping rod 322 fixedly connected to the outside of the shaping ring 321. The shaping rod 322 has a straight or arc-shaped structure, and the cross-section of the shaping rod 322 is an L-shaped structure, that is, an open structure on one side, which facilitates the collection and storage of impurities.

[0025] Furthermore, the drive block 33 has a hollow internal structure, and corresponding slag discharge holes 34 are provided on the side of the drive block 33 and the shaping frame 32. A through hole 35 is provided at one end of the drive block 33. The drive block 33 can fill and fix the center of the filter screen 31, so that the screw of the screw extruder can be used to rotate the screen to remove impurities from the material. The structure of the slag discharge hole 34 can connect the inside of the shaping rod 322 with the drive block 33, which facilitates subsequent slag removal operations.

[0026] It is worth noting that a connecting rod 36 is internally connected to the shaping frame 32, and a connecting rod is connected to the end of the connecting rod 36. The end of the connecting rod abuts against the drive block 33. The inner circumference of the support frame 23 has a sloping structure, and a positioning plate 24 is fixedly connected to the support frame 23. The connecting rod 36 and the shaping rod 322 are both L-shaped structures, and the connecting rod 36 and the shaping rod 322 are combined to form a U-shaped structure. A spring is fixedly connected to the inner side of the connecting rod 36. During filtration, the material compression can cause the connecting rod 36 to rotate, so that the connecting rod 36... The side closest to the screen rotates open, facilitating the collection of impurities. The connecting rod structure drives the drive block 33, causing the drive blocks 33 to move away from each other and their ends to abut against the screw of the screw extruder. The screw drives the drive block 33 to rotate. The support frame 23 has a groove inside that corresponds to the structure of the filter screen 31. A pressure relief valve is connected to the support frame 23. The pressure relief valve includes a pressure relief hole on the support frame 23. A return spring is fixedly connected inside the pressure relief hole, and a sealing plug is fixedly connected to the end of the return spring.

[0027] Example 3 like Figures 1-3 , Figure 5 As shown, based on embodiment 2, the screen changing mechanism 2 is provided with a cleaning mechanism 4, which can automatically clean the switched filter screen 31.

[0028] In this embodiment, the cleaning mechanism 4 includes a cleaning hole 41, which is opened on one side of the sealing shell 25. A protective sleeve 42 is fixedly connected to the outside of the cleaning hole 41. A heating tube 43 is slidably connected inside the protective sleeve 42. A heating component 44 is provided inside the protective sleeve 42. The structure of the cleaning hole 41 allows the heating tube 43 to communicate with the through hole 35 on the drive block 33. The through hole 35 and the slag discharge hole 34 are used to clean the impurities inside the shaping rod 322. The heating component 44 can heat the cleaning mechanism 4 to keep the filter screen 31 at a set temperature, preventing the material on the filter screen 31 from solidifying and becoming difficult to clean. At the same time, the heating component 44 can preheat the filter screen 31 so that the filter screen 31 can be kept at a set temperature when the filter screen 31 is replaced.

[0029] In addition, the heating assembly 44 includes a heating rod 441, which is fixedly connected to the protective sleeve 42. A limiting plate 442 is fixedly connected to the side of the heating tube 43. The heating rod 441 passes through the limiting plate 442. Corresponding contact springs 443 are fixedly connected to the side of the limiting plate 442 and the inside of the protective sleeve 42. The structure of the heating rod 441 can continuously heat the limiting plate 442 and the heating tube 43, so that the gas flowing inside the heating tube 43 is kept within the set temperature range. At the same time, the structure of the contact springs 443 can move the heating tube 43 to abut against the driving block 33 to open the heating rod 441.

[0030] It is worth noting that the cleaning mechanism 4 also includes an air pump 45, which is connected to the heating tube 43 via a pipe. A solenoid valve is installed on the pipe. A drive frame 47 is fixedly connected to the end of the heating tube 43. An electric push rod is fixedly connected to the side of the outer casing 21. The output end of the electric push rod is fixedly connected to the drive frame 47. The air pump 45 can pump air into the heating tube 43, thereby using the airflow to clean the impurities inside the shaping rod 322. At the same time, the solenoid valve can control the opening and closing of the pipe, so that the air pump 45 can be connected to the screen that needs to be cleaned. The drive frame 47 can drive the heating tube 43 to move, so that the heating tube 43 can come into contact with the drive block 33.

[0031] In the use of the screw extruder filter screen self-cleaning device of the present invention, when the screen needs to be replaced, the drive device drives the support frame 23 to move. After the support frame 23 moves, it moves and removes the filter screen 31 to be replaced from inside the outer shell 21, and at the same time moves the new filter screen 31 into the outer shell 21. After the filter screen 31 moves into the outer shell 21, the molten material inside the screw extruder body 1 moves to the other end under impact. The connecting rod inside the drive block 33 moves under pressure and pushes another drive block 33, so that the drive block 33 can abut against the end of the screw. When the screw rotates, it can drive the filter screen 31 to rotate synchronously, and the impurities can be moved into the shaping rod 322 by utilizing the flow of material.

[0032] The replaced filter 31 is removed from the housing 21. Simultaneously, the push rod motor drives the heating tube 43 to move. After the heating tube 43 moves to the set position, the push rod motor stops, and the solenoid valve corresponding to the filter 31 opens. The air pump 45 continuously supplies airflow into the heating tube 43. As the heating tube 43 moves, the limiting plate 442 moves synchronously. The limiting plate 442 moves along the heating rod 441. When the contact spring 443 on the limiting plate 442 connects with the contact spring 443 inside the protective sleeve 42, the heating rod 441 starts and heats the limiting plate 442 and the heating tube 43. The air flowing into the heating tube 43 under the drive of the air pump 45 is heated by the heating rod 441, so that the air is heated to the set temperature as it flows along the heating tube 43. Then, the air flows from the through hole 35 on the drive block 33 into the drive block 33, and then flows along the slag discharge hole 34 into the shaping rod 322. As air is continuously pumped in, the internal gas pressure continues to increase. When it reaches the set pressure, the internal gas pushes open the pressure relief valve and is discharged from the valve. The high-speed airflow blows the impurities inside the shaping rod 322 outward synchronously, thereby cleaning the impurities inside the shaping rod 322. At the same time, since the gas is directly introduced into the drive block 33, the air will flow to the other side of the filter screen 31. Also, since there is a certain gap between the heating tube 43 and the protective sleeve 42, when the internal air leaks outward, it will impact the filter screen 31 from the opposite direction of the material flow, thereby blowing the impurities off the filter screen 31.

[0033] 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 process, method, article, or apparatus.

[0034] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-cleaning device for a screen of a screw extruder, characterized in that: Including screw extruder body (1); The screen changing mechanism (2) is provided with a filtering mechanism (3) and a cleaning mechanism (4). The screen changing mechanism (2) includes a shell (21) fixedly connected to the screw extruder body (1), a replacement groove (22) is formed in the shell (21), a sealing shell (25) is fixedly connected to the shell (21), a support frame (23) is slidably connected in the sealing shell (25), and a driving device is further included in the screen changing mechanism (2) to move and switch the support frame (23).

2. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The filtering mechanism (3) includes a filter screen (31) detachably connected to the support frame (23), the filter screen (31) has an annular structure, a shaping frame (32) is fixedly connected to the filter screen (31), and a driving block (33) is connected to the middle of the shaping frame (32).

3. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The shaping frame (32) includes a shaping ring (321) fixedly connected to the middle of the filter screen (31) and a shaping rod (322) fixedly connected to the outer side of the shaping ring (321), and the shaping rod (322) has a linear structure or an arc structure.

4. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The driving block (33) has a hollow structure, a deslagging hole (34) is formed in the side surface of the driving block (33) and the shaping frame (32), and a through hole (35) is formed in one end of the driving block (33).

5. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: A connecting rod (36) is connected to the inside of the shaping frame (32), a connecting rod is slidably connected to the inside of the driving block (33), and the end of the connecting rod abuts against the driving block (33).

6. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The inside of the support frame (23) has an inclined surface structure, a positioning plate (24) is fixedly connected to the support frame (23), a groove corresponding to the structure of the filter screen (31) is formed in the inside of the support frame (23), and a pressure relief valve is connected to the support frame (23).

7. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The cleaning mechanism (4) includes a cleaning hole (41) formed in one side of the sealing shell (25), a protective sleeve (42) fixedly connected to the outside of the cleaning hole (41), a heating pipe (43) slidably connected to the inside of the protective sleeve (42), and a heating assembly (44) arranged in the inside of the protective sleeve (42).

8. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The heating assembly (44) includes a heating rod (441) fixedly connected to the protective sleeve (42), a limiting plate (442) fixedly connected to the side surface of the heating pipe (43), the heating rod (441) passes through the limiting plate (442), and a contact spring (443) corresponding to the limiting plate (442) and the inside of the protective sleeve (42) is fixedly connected to the side surface of the limiting plate (442) and the inside of the protective sleeve (42).

9. A self-cleaning screen device for a screw extruder as claimed in claim 1, characterized in that: The cleaning mechanism (4) further includes an air pump (45) in communication with the heating pipe (43) through a pipeline, an electromagnetic valve is arranged on the pipeline, a driving frame (47) is fixedly connected to the end of the heating pipe (43), an electric push rod is fixedly connected to the side surface of the shell (21), and the output end of the electric push rod is fixedly connected to the driving frame (47).

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