Extruder filter screen changeback device

Abstract

This utility model relates to an extruder filter screen changing backflushing device, which effectively solves the problems of leakage and instability in extruder screen changing devices. The technical solution includes a core column, an inner cylinder, and an outer cylinder coaxially arranged from the inside to the outside. The lower end of the core column is fixed to the lower end of the outer cylinder. The side wall of the inner cylinder fits against the core column and the outer cylinder, and the core column can rotate around its axis. An axial groove is opened on the side wall of the core column, with the lower end of the axial groove opening to the lower end face of the core column and the upper end closed. Several filter screens are evenly distributed around the side wall of the inner cylinder. A feed port is provided on the side wall of the outer cylinder, which is aligned with the groove opening of the axial groove of the core column. A discharge port is opened at the bottom of the outer cylinder, which is aligned with the lower end of the axial groove. A slag discharge port is opened on the side wall of the outer cylinder. An axial liquid channel is opened inside the core column, and a slit connects the liquid channel and the outer wall of the core column. The outer end of the slit corresponds to the slag discharge port. This utility model can ensure that the material does not leak during operation and screen changing, and the movement is more stable and reliable.

Description

Technical Field

[0001] This utility model relates to the field of extruders, specifically an extruder filter screen replacement backflushing device. Background Technology

[0002] The utility model patent with application number CN202121037702.9 discloses a non-stop filter replacement device for an extruder. The filter passes through the material channel on both sides, and the screen replacement operation is achieved by pulling the filter. However, it was found that this structure has drawbacks in use. On the one hand, when the filter passes through the through groove of the material channel, the material will continuously leak out in a small amount along the through groove under the pressure of the extruder. On the other hand, the fit between the filter and the through groove is extremely unstable. In addition, the filter is equipped with baffles, and the filter is very easy to get stuck during the pulling process. Although crossbars are set to guide it, it is still difficult to completely solve the problem. Summary of the Invention

[0003] This invention provides an extruder filter screen changing backflushing device, which aims to solve the problems of leakage and instability in extruder screen changing devices.

[0004] The technical solution includes a core column, an inner cylinder, and an outer cylinder coaxially nested together from the inside out. The lower end of the core column is fixed to the lower end of the outer cylinder. The side wall of the inner cylinder fits against the core column and the outer cylinder, and the core column can rotate around its axis. An axial groove is opened on the side wall of the core column, with the lower end of the axial groove opening to the lower end face of the core column and the upper end closed. Several filter screens are evenly distributed around the circumference of the side wall of the inner cylinder. A feed port is provided on the side wall of the outer cylinder, which is aligned with the groove opening of the axial groove of the core column. A discharge port is opened at the bottom of the outer cylinder, which is aligned with the lower end of the axial groove. A slag discharge port is opened on the side wall of the outer cylinder. An axial liquid channel is opened inside the core column, and a slit connects the liquid channel and the outer wall of the core column. The outer end of the slit corresponds to the slag discharge port.

[0005] The inner cylinder has several circumferentially distributed windows on its side wall, and the filter screens are installed in the windows one by one.

[0006] The inner wall and outer wall of the inner cylinder are each equipped with two sealing rings and several sealing strips. The two sealing rings are located at the upper and lower ends of the inner cylinder side wall and are respectively used to seal the core column and the outer cylinder. The sealing strips are installed axially in a one-to-one correspondence between adjacent filter screens. Each filter screen is completely surrounded by the sealing rings at the upper and lower ends and the sealing strips on both sides.

[0007] The slits are arranged in a fan shape and are evenly distributed in multiples.

[0008] The inner cylinder is provided with a toothed ring at its upper end for driving the inner cylinder to rotate.

[0009] This invention allows for screen replacement via the rotation of the inner cylinder, enabling filter switching and cleaning without stopping the machine. The sealing between the inner and outer cylinders and the cylindrical surfaces of the core column ensures no leakage of materials during operation, and the cylindrical surface fit also makes the relative movement of the components more stable and reliable. Attached Figure Description

[0010] Figure 1 This is the front view of the present invention.

[0011] Figure 2 This is a top view of the present invention.

[0012] Figure 3 This is the front sectional view of the present invention.

[0013] Figure 4 This is a top sectional view of the present invention.

[0014] Figure 5 The three-dimensional representation of this utility model Figure 1 .

[0015] Figure 6 The three-dimensional representation of this utility model Figure 2 The image shows a partial cross-section of the outer cylinder.

[0016] Figure 7 The three-dimensional representation of this utility model Figure 3 The image shows a partial cross-section of the outer cylinder.

[0017] Figure 8 Disassembly of this utility model Figure 1 .

[0018] Figure 9 Disassembly of this utility model Figure 2 . Detailed Implementation

[0019] Referring to the accompanying drawings, this utility model includes a core column 1, an inner cylinder 2, and an outer cylinder 3 coaxially sleeved together from the inside to the outside. The lower end of the core column 1 is fixed to the lower end of the outer cylinder 3. The side wall of the inner cylinder 2 is in contact with the core column 1 and the outer cylinder 3, and the core column 1 can rotate around the axis. An axial groove 4 is opened on the side wall of the core column 1. The lower end of the axial groove 4 opens to the lower end face of the core column 1, and the upper end is closed. A plurality of filter screens 5 are evenly distributed around the side wall of the inner cylinder 2. A feed inlet 6 is provided on the side wall of the outer cylinder 3. The feed inlet 6 is aligned with the groove opening of the axial groove 4 of the core column 1. A discharge outlet 7 is opened at the bottom of the outer cylinder 3. The discharge outlet 7 is aligned with the lower end of the axial groove 4. The rotation of the filter cylinder can cause the filter screens 5 to be positioned between the feed inlet 6 and the axial groove 4 in sequence. The material enters the outer cylinder 3 from the feed inlet 6, enters the axial groove 4 through the filter screens 5, and then is discharged from the lower end of the axial groove 4 through the discharge outlet 7. The outer cylinder 3 has a slag discharge port 8 on its side wall. With the rotation direction of the inner cylinder 2 as a reference, the slag discharge port 8 is located downstream of the feed inlet 6. The core column 1 has an axial liquid channel 9. The liquid channel 9 is connected to the outer wall of the core column 1 by a slit 10. The outer end of the slit 10 corresponds to the slag discharge port 8. The liquid channel 9 is connected to flushing water. When a filter screen 5 on the inner cylinder 2 rotates to the slag discharge port 8, water flows through the liquid channel 9 and the slit 10 and sprays out from the outer end of the slit 10 to backwash the filter screen 5.

[0020] The inner cylinder 2 has several circumferentially distributed windows 11 on its side wall, and the filter screens 5 are installed in the windows 11 one by one.

[0021] The inner wall and outer wall of the inner cylinder 2 are each equipped with two sealing rings 12 and several sealing strips 13. The two sealing rings 12 are located at the upper and lower ends of the side wall of the inner cylinder 2, respectively, and are sealed with the core column 1 and the outer cylinder 3. The sealing strips 13 are installed axially one-to-one between adjacent filter screens 5. Each filter screen 5 is completely surrounded by the sealing rings 12 at the upper and lower ends and the sealing strips 13 on both sides, so that the material cannot enter between the inner cylinder 2 and the outer cylinder 3 or between the inner cylinder 2 and the core column 1, thus avoiding the cross-flow of material between different filter screens 5. The only flow path of the material is from the feed port 6 through the filter screen 5 to the axial groove 4, and then discharged from the lower end of the axial groove 4 through the discharge port 7.

[0022] The slits 10 are evenly distributed in a fan shape, which increases the recoil area and improves the recoil efficiency.

[0023] The inner cylinder 2 is provided with a toothed ring 14 at its upper end for driving the inner cylinder 2 to rotate.

[0024] In use, the material enters the outer cylinder 3 through the feed inlet 6, then enters the axial groove 4 through the filter screen 5 on the inner cylinder 2, and is discharged from the lower end of the axial groove 4 through the discharge outlet 7, thus achieving material filtration. Due to the separation of the sealing ring 12 and the sealing strip 13, the material cannot flow through the gap between the inner cylinder 2 and the outer cylinder 3 and the core column 1, thus preventing material leakage.

[0025] When the filter screen 5 at the feed inlet 6 is clogged, the inner cylinder 2 is rotated so that the next filter screen 5 switches to the feed inlet 6 for filtration. When the clogged filter screen 5 rotates to the slag discharge port 8, the backwash water is sprayed out from the slit 10 to backwash the filter screen 5, thereby realizing the cyclic switching and cleaning of the filter screen 5.

[0026] This invention allows for screen replacement by rotating the inner cylinder 2, enabling the switching and cleaning of the filter screen 5 without stopping the machine. The sealing between the inner cylinder 2, the outer cylinder 3, and the cylindrical surface of the core column 1 ensures that there is no leakage of materials during operation, and the cylindrical surface fit also makes the mutual movement of each component more stable and reliable.

Claims

1. A backflushing device for changing screens in an extruder filter, characterized in that, The inner cylinder (2) and outer cylinder (3) are coaxially fitted together from the inside out. The lower end of the inner cylinder (1) is fixed to the lower end of the outer cylinder (3). The side wall of the inner cylinder (2) is fitted with the inner cylinder (1) and the outer cylinder (3), and the inner cylinder (1) can rotate around the axis. An axial groove (4) is opened on the side wall of the inner cylinder (1). The lower end of the axial groove (4) is open to the lower end face of the inner cylinder (1), and the upper end is closed. Several filter screens (5) are evenly distributed around the side wall of the inner cylinder (2). 3) has a feed inlet (6) on its side wall, which is aligned with the groove of the axial groove (4) of the core column (1). The bottom of the outer cylinder (3) has a discharge port (7), which is aligned with the lower end of the axial groove (4). The side wall of the outer cylinder (3) has a slag discharge port (8), and the core column (1) has an axial liquid channel (9). The liquid channel (9) is connected to the outer wall of the core column (1) by a slit (10), and the outer end of the slit (10) corresponds to the slag discharge port (8).

2. The extruder filter screen changing backflushing device according to claim 1, characterized in that, The inner cylinder (2) has several circumferentially distributed windows (11) on its side wall, and the filter screen (5) is installed in the window (11) one by one.

3. The extruder filter screen changing backflushing device according to claim 1, characterized in that, The inner wall (2) and outer wall are equipped with two sealing rings (12) and several sealing strips (13). The two sealing rings (12) are located at the upper and lower ends of the side wall of the inner cylinder (2) and are respectively sealed with the core column (1) and the outer cylinder (3). The sealing strips (13) are installed axially one-to-one between adjacent filter screens (5). Each filter screen (5) is completely surrounded by the sealing rings (12) at the upper and lower ends and the sealing strips (13) on both sides.

4. The extruder filter screen changing backflushing device according to claim 1, characterized in that, The slits (10) are evenly distributed in a fan shape.

5. The extruder filter screen changing backflushing device according to claim 1, characterized in that, The inner cylinder (2) is provided with a toothed ring (14) at the upper end for driving the inner cylinder (2) to rotate.

Images