Backwash screen exchanger

Abstract

The utility model discloses a backwashing screen exchanger in the technical field of screen exchangers, which comprises a screen exchanger body, the front side and the rear side of the screen exchanger body are respectively provided with a feed port and a discharge port, the front end inside the screen exchanger body is provided with a first flow channel communicated with the feed port, the rear end inside the screen exchanger body is provided with a second flow channel communicated with the discharge port, and the first flow channel is communicated with the discharge port. The two sides of the interior of the screen exchanger body are each provided with a reserved cavity, and the two sets of reserved cavities communicate with the first flow channel and the second flow channel correspondingly. The first rotary valves, the first flow channels, the frame body, the filter screens, the reserved cavity, the second rotary valve and the screen exchanger body are arranged in a matched mode, when the filter screen on one side is blocked, one of the first rotary valves can be closed, the second flow channels are kept unblocked, and the filter screen on the other side is not blocked. Under the pressure of the material fluid, the material fluid can reversely flow out of the outlet close to the blocked filter screen, so that the filter screen is reversely cleaned, and the filter function of the filter screen is recovered.

Description

Technical Field

[0001] This utility model relates to the technical field of screen changers, and in particular to backwash screen changers. Background Technology

[0002] A screen changer is a manual or automatic switching device that includes one or more screens to filter out foreign particles and impurities as plasticized material flows through the screen. Screen changers can be installed on any new or existing extruder, melt pump, reactor, or other extrusion production line and can be used to filter any type of polymer, rubber, or ceramic melt.

[0003] A column-type screen changer with patent publication number CN219114751U includes a double-column double-station and a hydraulic cylinder mechanism. A double-column sealing mechanism is provided on one side of the double-column double-station, and an integrated sealing frame is installed on one side of the double-column sealing mechanism. The hydraulic cylinder mechanism is located on one side of the integrated sealing frame. An internal hydraulic rod is installed inside the hydraulic cylinder mechanism, and an internal column hydraulic cylinder is installed below the internal hydraulic rod. A leak-proof frame runs through one side of the internal column hydraulic cylinder, and an internal double-net double-channel mechanism is installed on one side of the leak-proof frame. A screen changing pipe is provided on one side of the internal double-net double-channel mechanism. This column-type screen changer effectively integrates a hollow, leak-proof frame into the built-in hydraulic rod and column cylinder, allowing for double-screen, double-channel through-motion. The built-in double-screen, double-channel mechanism is sealed inside the leak-proof frame, facilitating screen replacement and disassembly. While this allows for convenient screen removal and replacement, frequent screen changes still impact equipment production efficiency. Therefore, ensuring proper screen cleaning during equipment operation is crucial. Utility Model Content

[0004] To address the issue of frequent filter replacements in existing screen changers impacting equipment production efficiency, this invention provides a backwashing screen changer.

[0005] This utility model provides a backwashing screen changer, which adopts the following technical solution:

[0006] A backwashing screen changer includes a screen changer body. The screen changer body has an inlet and an outlet on its front and rear sides, respectively. A first flow channel communicating with the inlet is located at the front end of the screen changer body, and a second flow channel communicating with the outlet is located at the rear end of the screen changer body. Reserved cavities are installed on both sides of the screen changer body, and these two sets of reserved cavities communicate with the first and second flow channels, respectively. A first rotary valve is installed on the side of the first flow channel closest to each of the two reserved cavities, and a second rotary valve is installed on the side of the second flow channel closest to each of the two reserved cavities. A frame is installed inside each of the reserved cavities, and a filter screen is installed inside the frame. Snap-fit ​​seats are installed on both sides of the screen changer body, and a connecting rod connects the snap-fit ​​seats to the frame. A drain channel is located in the middle of each snap-fit ​​seat, and a drain valve is installed inside the drain channel.

[0007] By adopting the above technical solution, the molten material flows into the interior of the first flow channel from the feed inlet. Two sets of first rotary valves are opened, and the molten material flows into the interior of two reserved chambers respectively. After being filtered by two sets of filter screens, two sets of second rotary valves are opened, and the molten material gathers and flows into the second flow channel and is discharged through the outlet, completing the filtration of the molten material. When the filter screen at the left end becomes clogged, the first rotary valve at the left end is closed, while the first rotary valve at the right end and the two sets of second rotary valves remain open. The drain valve at the left end is opened, and the molten material flows in from the feed inlet, passing through the first flow channel and the screen changer body in sequence. Because the first rotary valve at the left end is closed, the molten material can only flow into the second flow channel through the first rotary valve at the right end. Only a small portion of the molten material flows backward through the second rotary valve and then through the opened drain valve. Under the reverse pressure of the molten material, the filter screen at the left end is backwashed. Similarly, when the filter screen at the right end becomes clogged, the filter screen on the other side can be backwashed.

[0008] Optionally, a sludge collection trough is installed at the lower ends of both sides of the screen switch body, and the sludge collection trough is located below the sewage discharge channel.

[0009] By adopting the above technical solution and setting up two sets of sewage receiving tanks, it is convenient to collect the waste residue discharged from the sewage channel in a unified manner.

[0010] Optionally, the first flow channel is Y-shaped and the second flow channel is inverted T-shaped.

[0011] By adopting the above technical solution, it is ensured that the melt can enter the interior of the two sets of reserved chambers through the first flow channel, and after filtration, it can be discharged from the outlet through the second flow channel.

[0012] Optionally, a snap-fit ​​assembly is provided between the snap-fit ​​base and the screen changer body. The snap-fit ​​assembly includes snap-fit ​​blocks, which are installed on both sides of the screen changer body. The snap-fit ​​base has a snap-fit ​​groove on the side near the screen changer body that engages with the snap-fit ​​blocks. Limiting components are provided at both the front and rear ends of the snap-fit ​​base.

[0013] By adopting the above technical solution, when it is necessary to separate the card connector from the network switch body, simply pull the card connector outward until the card block separates from the card slot, and then the card connector can be removed.

[0014] Optionally, the limiting component includes a protective shell, which is installed at both ends of the locking seat. A sliding plate is installed inside the protective shell. A pull rod is connected to the end of the sliding plate away from the locking seat. The end of the pull rod away from the sliding plate extends out of the protective shell and is fitted with a pull plate. A positioning spring is sleeved on the outer wall of the pull rod, and the positioning spring is located between the inner wall of the protective shell and the sliding plate. A limiting rod is connected to the end of the sliding plate away from the pull rod. A limiting groove is opened on the side of the locking block away from the center of the locking seat, which is engaged with the limiting rod.

[0015] By adopting the above technical solution, when it is necessary to release the fixing effect of the limiting rod on the block, pull the pull plate outward. The pull plate drives the slide plate to move through the pull rod and compresses the positioning spring. The movement of the slide plate drives the limiting rod to move until the limiting rod separates from the limiting groove.

[0016] Optionally, pull rings are installed on the side of both sets of card holders facing away from the network switch body.

[0017] By adopting the above technical solution, it is convenient for operators to pull the locking seat by holding the pull ring.

[0018] Optionally, a fixing component is provided between the frame and the filter screen. The fixing component includes a fixing block, which is fixedly installed at the top and bottom of the inner cavity of the frame. The fixing block is located at the end of the frame inside near the screen changer body. Mounting seats are installed at the top and bottom of the inner wall of the frame. A movable plate is installed inside the mounting seat. A movable block is installed on the side of the movable plate near the center of the frame. A guide rod is connected to the end of the movable plate away from the movable block. A return spring is sleeved on the outer side of the guide rod, and the return spring is located between the movable plate and the inner wall of the mounting seat.

[0019] By adopting the above technical solution, after the frame is removed from the interior of the reserved cavity, the operator presses the movable stop, which moves the movable plate and compresses the reset spring until the movable stop is fully inserted into the interior of the mounting base. At this time, the fixing effect of the mounting base on the filter screen is released, so that the filter screen can be removed from the interior of the frame and replaced.

[0020] In summary, this utility model has at least one of the following beneficial effects:

[0021] By coordinating the first rotary valve, the first flow channel, the frame, the filter screen, the reserved cavity, the second rotary valve, and the screen changer body, when the filter screen on one side becomes clogged, one of the first rotary valves can be closed while the second flow channel remains unobstructed. Under the pressure of the material fluid, it can flow out in reverse from the outlet near the clogged filter screen, thus achieving reverse cleaning of the filter screen and restoring its filtering function.

[0022] When one side of the filter screen is damaged, the clogged filter screen can be replaced by controlling the opening and closing of one set of first rotary valves and second rotary valves. During the operation, the filter screen on the other side can work normally, so the filter screen can be replaced without stopping the machine. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 2 This is a front view structural diagram of the present utility model;

[0026] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0027] Figure 4 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0028] Figure 5 For the present utility model Figure 1 Enlarged structural diagram at point B.

[0029] In the diagram: 1. Screen changer body; 2. First rotary valve; 3. First flow channel; 4. Snap-fit ​​assembly; 401. Snap-fit ​​block; 402. Snap-fit ​​groove; 5. Sewage discharge channel; 6. Snap-fit ​​seat; 7. Sewage collection trough; 8. Connecting rod; 9. Frame; 10. Filter screen; 11. Reserved cavity; 12. Second rotary valve; 13. Second flow channel; 14. Limiting assembly; 1401. Pull plate; 1402. Pull rod; 1403. Positioning spring; 1404. Protective shell; 1405. Slide plate; 1406. Limiting rod; 1407. Limiting groove; 15. Sewage discharge valve; 16. Pull ring; 17. Fixing assembly; 1701. Movable stop block; 1702. Movable plate; 1703. Guide rod; 1704. Return spring; 1705. Mounting seat; 1706. Fixing stop block; 18. Feed inlet; 19. Discharge outlet. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in further detail below.

[0031] Please refer to the attached diagram in the instruction manual. Figure 1 and Figure 2 This utility model provides an embodiment of a backwashing screen changer, comprising a screen changer body 1. The screen changer body 1 has an inlet 18 and an outlet 19 on its front and rear sides, respectively. The front end of the screen changer body 1 has a first flow channel 3 communicating with the inlet 18, and the rear end of the screen changer body 1 has a second flow channel 13 communicating with the outlet 19. The first flow channel 3 is Y-shaped, and the second flow channel 13 is an inverted T-shaped. This ensures that the melt can enter the two sets of reserved chambers 11 through the first flow channel 3, be filtered, and then be discharged from the outlet 19 through the second flow channel 13.

[0032] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 and Figure 4The screen changer body 1 has reserved cavities 11 installed on both sides inside. The two sets of reserved cavities 11 are respectively connected to the first flow channel 3 and the second flow channel 13. The first flow channel 3 is provided with a first rotary valve 2 on the side near the two sets of reserved cavities 11, and the second flow channel 13 is provided with a second rotary valve 12 on the side near the two sets of reserved cavities 11. A frame 9 is installed inside the reserved cavity 11, and a filter screen 10 is installed inside the frame 9. A fixing component 17 is provided between the frame 9 and the filter screen 10. The fixing component 17 includes a fixing block 1706, which is fixedly installed in the inner cavity of the frame 9. At the top and bottom, the fixed stop 1706 is located inside the frame 9 near one end of the screen changer body 1. Mounting seats 1705 are installed at the top and bottom of the inner wall of the frame 9. A movable plate 1702 is installed inside the mounting seat 1705. A movable stop 1701 is installed on the side of the movable plate 1702 near the center of the frame 9. A guide rod 1703 is connected to the end of the movable plate 1702 away from the movable stop 1701. A return spring 1704 is sleeved on the outside of the guide rod 1703, and the return spring 1704 is located between the movable plate 1702 and the inner wall of the mounting seat 1705. After the frame 9 is removed from the reserved cavity 11, the operator presses the movable stop 1701. The movable stop 1701 moves the movable plate 1702 and compresses the return spring 1704 until the movable stop 1701 is fully inserted into the mounting base 1705. At this time, the fixing effect of the mounting base 1705 on the filter screen 10 is released, so that the filter screen 10 can be removed from the inside of the frame 9 and replaced.

[0033] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 3 and Figure 5 The screen changer body 1 has two locking seats 6 installed on both sides. A locking assembly 4 is provided between the locking seats 6 and the screen changer body 1. The locking assembly 4 includes locking blocks 401, which are installed on both sides of the screen changer body 1. The locking seat 6 has a locking groove 402 on the side closest to the screen changer body 1, which engages with the locking blocks 401. Limiting components 14 are provided at both the front and rear ends of the locking seat 6. When it is necessary to separate the locking seat 6 from the screen changer body 1, the locking seat 6 is pulled outwards until the locking blocks 401 separate from the locking grooves 402, allowing the locking seat 6 to be removed. Pull rings 16 are installed on the side of both locking seats 6 facing away from the screen changer body 1. This allows the operator to easily move the locking seat 6 by pulling on the pull rings 16.

[0034] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 and Figure 5The limiting component 14 includes a protective shell 1404, which is installed at both ends of the snap-fit ​​seat 6. A sliding plate 1405 is installed inside the protective shell 1404. A pull rod 1402 is connected to the end of the sliding plate 1405 away from the snap-fit ​​seat 6. The end of the pull rod 1402 away from the sliding plate 1405 extends out of the protective shell 1404 and is equipped with a pull plate 1401. A positioning spring 1403 is sleeved on the outer wall of the pull rod 1402, and the positioning spring 1403 is located between the inner wall of the protective shell 1404 and the sliding plate 1405. A limiting rod 1406 is connected to the end of the sliding plate 1405 away from the pull rod 1402. A limiting groove 1407 is opened on the side of the snap-fit ​​block 401 away from the center of the snap-fit ​​seat 6, which is engaged with the limiting rod 1406. When it is necessary to release the fixing effect of the limiting rod 1406 on the locking block 401, pull the pull plate 1401 outward. The pull plate 1401 drives the slide plate 1405 to move through the pull rod 1402 and compresses the positioning spring 1403. The movement of the slide plate 1405 drives the limiting rod 1406 to move until the limiting rod 1406 separates from the limiting groove 1407.

[0035] Please refer to the attached diagram in the instruction manual. Figure 1 , Figure 2 and Figure 3 A connecting rod 8 connects the card holder 6 to the frame 9. A sewage discharge channel 5 is provided in the middle of the card holder 6. Sewage collection troughs 7 are installed at the lower ends of both sides of the screen changer body 1, and the sewage collection troughs 7 are located below the sewage discharge channel 5. The setting of two sets of sewage collection troughs 7 facilitates the unified collection of waste residue discharged from the sewage discharge channel 5. A sewage discharge valve 15 is installed inside the sewage discharge channel 5.

[0036] Working principle: During use, the molten material flows into the interior of the first flow channel 3 from the feed port 18. The two sets of first rotary valves 2 are opened, and the molten material flows into the interior of the two sets of reserved chambers 11 respectively. After being filtered by the two sets of filter screens 10, the two sets of second rotary valves 12 are opened, and the molten material gathers and flows into the second flow channel 13 and is discharged through the discharge port 19, thus completing the filtration of the molten material.

[0037] When the filter screen 10 located on the left end becomes clogged, it can be backflushed. First, close the first rotary valve 2 on the left end, and keep the first rotary valve 2 on the right end and the two sets of second rotary valves 12 open. Then, open the drain valve 15 on the left end. The molten material flows in from the feed inlet 18 and passes through the first flow channel 3 and the screen changer body 1 in sequence. Since the first rotary valve 2 on the left end is closed, the molten material can only flow into the second flow channel 13 through the first rotary valve 2 on the right end. Only a small portion of the molten material flows back. The material flows through the second rotary valve 12 on the left end and then through the open drain valve 15. Under the reverse pressure of the molten material, the filter screen 10 on the left end is backwashed. The washed molten material flows into the corresponding sludge receiving tank 7 through the open drain valve 15. While not affecting the normal filtration of the molten material through the other filter screen 10, the reverse cleaning of the filter screen 10 on the left end is completed. Similarly, when the filter screen 10 on the right end is blocked, the filter screen 10 on the other side can be backwashed.

[0038] When the filter screen 10 on the left needs to be replaced, the first rotary valve 2 and the second rotary valve 12 on the left are closed, while the first rotary valve 2 and the second rotary valve 12 on the right are open. Both drain valves 2 are closed, and the molten material flows in from the feed inlet 18. Since the first rotary valve 2 on the left is closed, the molten material can only flow into the reserved cavity 11 on the right from the first rotary valve 2 on the right. After being filtered by the filter screen 10 on the right, it flows out. Since the second rotary valve 12 on the left is also closed, the molten material will not flow in reverse.

[0039] At this point, pulling the pull plate 1401 outward causes the pull plate 1401 to move the slide plate 1405 via the pull rod 1402, which in turn causes the limiting rod 1406 to separate from the limiting groove 1407, releasing the fixing effect of the limiting rod 1406 on the locking block 401. Then, the operator holds the pull ring 16 and pulls the locking seat 6 outward, causing the locking block 401 to separate from the locking groove 402. The locking seat 6 moves outward, which in turn causes the frame 9 to move outward via the connecting rod 8, until the frame 9 is removed from the interior of the reserved cavity 11. Then press the movable stop 1701. The movable stop 1701 drives the movable plate 1702 to move and causes the return spring 1704 to contract until the movable stop 1701 is fully inserted into the mounting base 1705, thereby releasing the fixing effect of the movable stop 1701 on the filter screen 10. At this time, the filter screen 10 can be removed from the inside of the frame 9 and replaced. This does not affect the filtration of the material melt, and at the same time, the damaged filter screen 10 can be disassembled or replaced.

[0040] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A backwash screen changer, comprising a screen changer body (1), characterized in that: The screen changer body (1) has an inlet (18) and an outlet (19) on its front and rear sides, respectively. The front end of the screen changer body (1) is provided with a first flow channel (3) communicating with the inlet (18), and the rear end of the screen changer body (1) is provided with a second flow channel (13) communicating with the outlet (19). Both sides of the screen changer body (1) are equipped with reserved cavities (11). The two sets of reserved cavities (11) are respectively connected to the first flow channel (3) and the second flow channel (13). The first flow channel (3) is close to the two sets of reserved cavities (11). A first rotary valve (2) is provided on one side of the second flow channel (13) and a second rotary valve (12) is provided on the side of the second flow channel (13) near the two sets of reserved cavities (11). A frame (9) is installed inside the reserved cavity (11), and a filter screen (10) is installed inside the frame (9). A snap-fit ​​seat (6) is installed on both sides of the screen changer body (1). A connecting rod (8) is connected between the snap-fit ​​seat (6) and the frame (9). A sewage discharge channel (5) is opened in the middle of the snap-fit ​​seat (6), and a sewage discharge valve (15) is provided inside the sewage discharge channel (5).

2. The backwashing screen changer according to claim 1, characterized in that: The lower ends of both sides of the screen changer body (1) are equipped with a sludge collection trough (7), and the sludge collection trough (7) is located below the sewage discharge channel (5).

3. The backwashing screen changer according to claim 1, characterized in that: The first flow channel (3) is Y-shaped, and the second flow channel (13) is inverted T-shaped.

4. The backwash screen changer according to claim 1, characterized in that: A snap-fit ​​assembly (4) is provided between the snap-fit ​​base (6) and the screen changer body (1). The snap-fit ​​assembly (4) includes a snap-fit ​​block (401). The snap-fit ​​block (401) is installed on both sides of the screen changer body (1). The snap-fit ​​base (6) has a snap-fit ​​groove (402) on the side near the screen changer body (1) that is inserted and matched with the snap-fit ​​block (401). Limiting components (14) are provided at both the front and rear ends of the snap-fit ​​base (6).

5. The backwash screen changer according to claim 4, characterized in that: The limiting component (14) includes a protective shell (1404), which is installed at both ends of the locking seat (6). A sliding plate (1405) is installed inside the protective shell (1404). A pull rod (1402) is connected to the end of the sliding plate (1405) away from the locking seat (6). The end of the pull rod (1402) away from the sliding plate (1405) extends out of the protective shell (1404) and is equipped with a pull plate. (1401) The outer wall of the pull rod (1402) is fitted with a positioning spring (1403), and the positioning spring (1403) is located between the inner wall of the protective shell (1404) and the slide plate (1405). The end of the slide plate (1405) away from the pull rod (1402) is connected to a limiting rod (1406). The side of the locking block (401) away from the center of the locking seat (6) is provided with a limiting groove (1407) that is inserted and cooperates with the limiting rod (1406).

6. The backwash screen changer according to claim 1, characterized in that: Both sets of card holders (6) are equipped with pull rings (16) on the side opposite to the network switch body (1).

7. The backwashing screen changer according to claim 1, characterized in that: A fixing component (17) is provided between the frame (9) and the filter screen (10). The fixing component (17) includes a fixing block (1706), which is fixedly installed at the top and bottom of the inner cavity of the frame (9). The fixing block (1706) is located at one end of the frame (9) near the screen changer body (1). Mounting seats (1705) are installed at the top and bottom of the inner wall of the frame (9). An internal movable plate (1702) is installed. A movable stop (1701) is installed on the side of the movable plate (1702) near the center of the frame (9). A guide rod (1703) is connected to the end of the movable plate (1702) away from the movable stop (1701). A return spring (1704) is sleeved on the outside of the guide rod (1703), and the return spring (1704) is located between the inner wall of the movable plate (1702) and the mounting base (1705).

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