Deslagging mechanism for candle filter

Abstract

The utility model discloses a deslagging mechanism for a candle filter, which comprises an inlet flange, the lower end of the inlet flange is provided with a cylinder, the bottom of the inner wall of the cylinder is provided with a sealing mechanism, one side of the cylinder is fixedly connected with an anti-dropping mechanism, the lower end of the cylinder is welded with a connecting flange I, and the connecting flange II is welded with a connecting flange II. A filter screen is detachably connected to the lower end of the first connecting flange, a second connecting flange is detachably connected to the lower end of the filter screen, and a mounting frame is fixedly connected to the other side of the barrel. By means of the sealing mechanism, when the candle filter works, it can be guaranteed that filter residues cannot leak from the residue discharging opening, and the sealing performance of the candle filter is effectively improved; by means of the anti-falling mechanism, the equipment can be more stably connected with all parts, the situation that the parts are loosened or fall off due to filter cake accumulation or liquid pressure in the using process is effectively prevented, and the tightness of the movable clamping plate can be flexibly adjusted through cooperation of the screw and the movable plate.

Description

Technical Field

[0001] This utility model relates to the field of candle filter technology, specifically to a slag discharge mechanism for candle filters. Background Technology

[0002] A candle filter is an automated pressure filtration device, mainly composed of a cylinder, filter element, filter cloth, filter aid, computer control system, and accessories. Its filtration process involves liquid passing through the filter cloth under pressure, causing solid particles to form a filter cake layer on the surface of the cloth, thus achieving solid-liquid separation.

[0003] According to patent document CN218687005U, a slurry discharge mechanism for a candle filter is disclosed, including a raw liquid tank, a filter, the filter being fixedly mounted on the upper end of the pulping tank, the filter being connected to the pulping tank via a slag discharge valve, the raw liquid tank being connected to the filter via a feeding assembly, a pulping pump, the pulping pump being connected to the pulping tank at both ends via pipes, a level switch being provided at the upper end of the pulping tank, a clear liquid tank being connected to the filter via a pipe, and a slurry discharge pump, one end of which is connected to the pulping tank via a pipe, and the other end being connected to an external concentrated slurry storage tank.

[0004] Currently, the traditional slag discharge mechanism of the candle filter is prone to clogging when there is a large amount of filter cake due to the small diameter of the slag discharge port required for pipeline transportation. It also has poor sealing effect. The bolt connection is usually used, which makes disassembly cumbersome and complicated, reducing the practicality of the device. Utility Model Content

[0005] The purpose of this utility model is to provide a slag discharge mechanism for candle filters, in order to solve the problems mentioned in the background art. The traditional slag discharge mechanism for candle filters is prone to clogging when there is a large amount of filter cake due to the small diameter of the slag discharge port required for pipeline transportation, and the poor sealing effect. In addition, bolts are usually used for connection, which makes disassembly cumbersome and complicated, reducing the practicality of the device.

[0006] To achieve the above objectives, this utility model provides the following technical solution: It includes an inlet flange, a cylinder is provided at the lower end of the inlet flange, a sealing mechanism is provided at the bottom of the inner wall of the cylinder, an anti-detachment mechanism is fixedly connected to one side of the cylinder, a connecting flange one is welded to the lower end of the cylinder, a filter screen is detachably connected to the lower end of the connecting flange one, a connecting flange two is detachably connected to the lower end of the filter screen, a mounting bracket is fixedly connected to the other side of the cylinder, and a cover-opening cylinder is hinged to one side of the mounting bracket;

[0007] The sealing mechanism includes a fixed ring, the outer wall of which is fixedly connected to the bottom of the inner wall of the cylinder. A sliding hole is provided on the upper inner wall of the fixed ring, and a sliding rod is provided on the inner wall of the sliding hole. A limit plate is fixedly connected to the upper end of the sliding rod, and a spring is sleeved on the outer wall of the sliding rod. A sealing ring is fixedly connected to the lower end of the spring.

[0008] Preferably, the upper inner wall of the fixing ring is connected through the outer wall of the sliding hole, and the inner wall of the sliding hole is slidably connected to the outer wall of the sliding rod.

[0009] Preferably, the upper end of the spring is fixedly connected to the lower end of the fixing ring, and the lower end of the spring is fixedly connected to the upper end of the sealing ring.

[0010] Preferably, the upper end of the cylinder is fixedly connected to the lower end of the inlet flange, and the outer wall of the sealing mechanism is fixedly connected to the bottom of the inner wall of the cylinder.

[0011] Preferably, the anti-detachment mechanism includes a fixed support, one side of which is welded to one side of the cylinder. A mounting shell is provided on one side of the fixed support. A movable groove is provided on the inner wall of the mounting shell. A screw is rotatably connected to the inner wall of the mounting shell. A rotating handle is fixedly connected to one end of the screw. A movable plate is threadedly connected to the outer wall of the screw. A movable clamping plate is fixedly connected to one side of the movable plate. A rubber pad is adhered to the inner side wall of the movable clamping plate.

[0012] Preferably, one side of the fixed support is fixedly connected to one side of the mounting shell, and the inner wall of the mounting shell is embedded and connected to the outer wall of the movable groove.

[0013] Preferably, the upper end of the movable plate is provided with a screw hole that is compatible with the screw rod.

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

[0015] 1. The sealing mechanism ensures that filter cake does not leak from the discharge port when the candle filter is in operation, effectively improving the sealing performance of the equipment. When the candle filter starts working, the liquid pressure pushes the sealing ring to fit tightly against the inner wall of the cylinder, forming an effective sealing barrier. Since the sealing ring is connected to the slide rod by a spring, the spring force ensures that the sealing ring always fits tightly against the bottom of the inner wall of the cylinder, maintaining a good sealing effect even when there is a lot of filter cake or when the liquid pressure fluctuates.

[0016] 2. The anti-detachment mechanism ensures a more secure connection between the components, effectively preventing loosening or detachment due to filter cake accumulation or liquid pressure during use. The movable clamping plate, through the cooperation of the screw and the movable plate, allows for flexible adjustment of its tightness to accommodate candle filter components of different sizes. Simultaneously, the rubber pads increase friction between the clamping plate and connecting flanges one and two, further enhancing connection stability. Furthermore, the rotating handle allows operators to easily rotate the screw, readily adjusting the position of the movable clamping plate, facilitating the installation and disassembly of the candle filter components, significantly improving the equipment's practicality and convenience. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the sealing mechanism of this utility model;

[0019] Figure 3 This is a schematic diagram of the anti-detachment mechanism of this utility model;

[0020] Figure 4 This is a three-dimensional side view of the present invention.

[0021] In the diagram: 1. Inlet flange; 2. Cylinder; 3. Sealing mechanism; 4. Anti-detachment mechanism; 5. Connecting flange one; 6. Filter screen; 7. Connecting flange two; 8. Mounting bracket; 9. Opening cylinder; 31. Fixing ring; 32. Sliding hole; 33. Sliding rod; 34. Limiting plate; 35. Spring; 36. Sealing ring; 41. Fixed support; 42. Mounting shell; 43. Movable groove; 44. Screw; 45. Rotary handle; 46. Movable plate; 47. Movable clamping plate; 48. Rubber pad. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 , Figure 2 and Figure 4This utility model provides a technical solution: a slag discharge mechanism for a candle filter, including an inlet flange 1, a cylinder 2 at the lower end of the inlet flange 1, a sealing mechanism 3 at the bottom of the inner wall of the cylinder 2, an anti-detachment mechanism 4 fixedly connected to one side of the cylinder 2, a connecting flange 5 welded to the lower end of the cylinder 2, a filter screen 6 detachably connected to the lower end of the connecting flange 5, a connecting flange 7 detachably connected to the lower end of the filter screen 6, a mounting bracket 8 fixedly connected to the other side of the cylinder 2, a cover-opening cylinder 9 hinged to one side of the mounting bracket 8, and a fixing ring 31, the outer wall of the fixing ring 31 being fixedly connected to the bottom of the inner wall of the cylinder 2. The upper inner wall of the fixed ring 31 is provided with a sliding hole 32, and a sliding rod 33 is provided on the inner wall of the sliding hole 32. The upper end of the sliding rod 33 is fixedly connected to a limit plate 34, and a spring 35 is sleeved on the outer wall of the sliding rod 33. A sealing ring 36 is fixedly connected to the lower end of the spring 35. The upper inner wall of the fixed ring 31 is connected through to the outer wall of the sliding hole 32. The inner wall of the sliding hole 32 is slidably connected to the outer wall of the sliding rod 33. The upper end of the spring 35 is fixedly connected to the lower end of the fixed ring 31, and the lower end of the spring 35 is fixedly connected to the upper end of the sealing ring 36. The upper end of the cylinder 2 is fixedly connected to the lower end of the inlet flange 1. The outer wall of the sealing mechanism 3 is fixedly connected to the bottom of the inner wall of the cylinder 2.

[0024] One side of the fixed support 41 is welded to one side of the cylinder 2. A mounting shell 42 is provided on one side of the fixed support 41. The inner wall of the mounting shell 42 is provided with a movable groove 43. A screw 44 is rotatably connected to the inner wall of the mounting shell 42. One end of the screw 44 is fixedly connected to a handle 45. By rotating the handle 45, the handle 45 drives the screw 44 to rotate on the inner wall of the mounting shell 42. A movable plate 46 is threadedly connected to the outer wall of the screw 44. The movable plate 46 moves under the rotation of the screw 44. A movable clamping plate 47 is fixedly connected to one side of the movable plate 46. The movable clamping plate 47 moves accordingly. A rubber pad 48 is adhered to the inner wall of the movable clamping plate 47. The rubber pad 48 increases the connection between the movable clamping plate 47 and the connecting flange 5, connecting flange 7, and filter screen. The friction between the filter screens 6 and 6 improves the stability of the filter screen 6 installation. One side of the fixed support 41 is fixedly connected to one side of the mounting shell 42. The inner wall of the mounting shell 42 is embedded and connected to the outer wall of the movable groove 43. The upper end of the movable plate 46 is provided with a screw hole that matches the screw 44. Through the screw hole, the screw 44 can pass through the movable plate 46 and be threadedly connected to the movable plate 46. The inlet flange 1 is provided, and the lower end of the inlet flange 1 is provided with a cylinder 2. A sealing mechanism 3 is provided at the bottom of the inner wall of the cylinder 2 to ensure the sealing performance during the filtration process. In addition, one side of the cylinder 2 is fixedly connected with an anti-detachment mechanism 4 to prevent the parts from accidentally falling off during operation. A connecting flange is welded at the lower end of the cylinder 2. 5. The lower end of connecting flange 5 is fixed for easy installation and replacement of filter screen 6. The lower end of filter screen 6 is also detachable. Connecting flange 7 is used in conjunction with it. A mounting bracket 8 is fixed to the other side of the cylinder 2. One side of the mounting bracket 8 is connected to a cover-opening cylinder 9 by a hinge. This allows the connecting flange 7 of the filter to be easily opened and closed when needed. The sealing mechanism 3 is one of the core parts of this slag discharge mechanism. The outer wall of the fixing ring 31 is firmly connected to the bottom of the inner wall of the cylinder 2. Multiple sliding holes 32 are opened on the upper inner wall of the fixing ring 31. The sliding holes 32 are equidistantly arranged along the upper circumference of the fixing ring 31. A sliding rod 33 is provided on the inner wall of the sliding hole 32. The upper end of the sliding rod 33 is fixed to a... Position plate 34 is used to control the movement range of slide rod 33. Spring 35 is sleeved on the outer wall of slide rod 33. A sealing ring 36 is fixed to the lower end of spring 35 to ensure sealing effect. The upper inner wall of fixing ring 31 is connected to the outer wall of sliding hole 32 to ensure sliding fit between sliding hole 32 and slide rod 33. At the same time, the upper end of spring 35 is fixed to the lower end of fixing ring 31, and the lower end of spring 35 is fixed to the upper end of sealing ring 36, thus forming a stable elastic seal. The upper end of cylinder 2 is fixed to the lower end of inlet flange 1 to ensure the stability and reliability of the overall structure. The outer wall of the entire sealing mechanism 3 is firmly connected to the bottom of the inner wall of cylinder 2, thereby ensuring the sealing performance of filter during operation.

[0025] Please see Figure 1 , Figure 3 and Figure 4 The anti-detachment mechanism 4 includes a fixed support 41, one side of which is welded to one side of the cylinder 2. A mounting shell 42 is provided on one side of the fixed support 41. A movable groove 43 is provided on the inner wall of the mounting shell 42. A screw 44 is rotatably connected to the inner wall of the mounting shell 42. A handle 45 is fixedly connected to one end of the screw 44. A movable plate 46 is threadedly connected to the outer wall of the screw 44. A movable clamping plate 47 is fixedly connected to one side of the movable plate 46. A rubber pad 48 is adhered to the inner side wall of the movable clamping plate 47. One side of the fixed support 41 is fixedly connected to one side of the mounting shell 42. The inner wall of the mounting shell 42 is embedded and connected to the outer wall of the movable groove 43. A screw hole adapted to the screw 44 is opened at the upper end of the movable plate 46.

[0026] One side of the fixed support 41 is tightly joined to one side of the cylinder 2 by welding. On the corresponding side of the fixed support 41, a mounting shell 42 is provided. The inner wall of the mounting shell 42 has a movable groove 43. A screw 44 is rotatably connected to the inner wall of the mounting shell 42. One end of the screw 44 is fixedly connected to a handle 45, allowing the operator to easily rotate the screw 44. A movable plate 46 is threaded onto the outer wall of the screw 44. A movable retaining plate 47 is fixedly connected to one side of the movable plate 46. To increase friction and provide protection, the movable retaining plate 47... A rubber pad 48 is affixed to the inner wall of plate 47. Furthermore, one side of the fixed support 41 is fixedly connected to one side of the mounting shell 42, ensuring structural stability. The inner wall of the mounting shell 42 is embedded into the outer wall of the movable groove 43, ensuring both mobility and tightness of the connection. Finally, the upper end of the movable plate 46 is provided with a screw hole adapted to the screw 44, facilitating the rotation and fixing of the screw 44. During operation, the slag discharge mechanism is connected to the slag discharge port of the candle filter via the inlet flange 1 and secured with bolts. When slag discharge is required, the opening cylinder 9 is activated. The output end of the opening cylinder 9 drives the filter screen 6 to move, and the connecting flange 7 drives the filter screen 6 to move simultaneously. When the filter screen 6 moves to a certain position, the filter screen 6 separates from the connecting flange 5. At this time, the filter cake falls through the filter screen 6 to the slag discharge port. At the same time, the sealing mechanism 3 seals the slag discharge port to prevent liquid leakage. When the sealing mechanism 3 needs to be replaced or repaired, the limit plate 34 is moved upward. The limit plate 34 drives the slide rod 33 to slide upward in the sliding hole 32. The slide rod 33 compresses the spring 35, and the spring 35 is compressed by force. Spring 35 drives sealing ring 36 to move upward. When sealing ring 36 moves to a certain position, sealing mechanism 3 can be replaced or repaired. The operation is simple and convenient. When it is necessary to fix the candle filter, turn handle 45. Handle 45 drives screw 44 to rotate in mounting housing 42. Screw 44 drives movable plate 46 to move in mounting housing 42. Movable plate 46 drives movable clamping plate 47 to move. When movable clamping plate 47 moves to the appropriate position, the candle filter can be fixed to prevent the candle filter from falling off during use, thus improving the practicality of the device.

[0027] Working principle: First, one side of the fixed support 41 is welded to one side of the cylinder 2. A mounting shell 42 is provided on one side of the fixed support 41. A movable groove 43 is provided on the inner wall of the mounting shell 42. A screw 44 is rotatably connected to the inner wall of the mounting shell 42. A handle 45 is fixedly connected to one end of the screw 44. By rotating the handle 45, the screw 44 rotates on the inner wall of the mounting shell 42. A movable plate 46 is threadedly connected to the outer wall of the screw 44. The movable plate 46 moves under the rotation of the screw 44. A movable retaining plate 47 is fixedly connected to one side of the movable plate 46, and the movable retaining plate 47 moves accordingly. A rubber pad 48 is adhered to the inner wall of the movable retaining plate 47. The rubber pad 48 increases the connection between the movable retaining plate 47 and the connecting flange 5. The friction between flange 7 and filter screen 6 improves the stability of filter screen 6 installation. One side of fixed support 41 is fixedly connected to one side of mounting shell 42. The inner wall of mounting shell 42 is embedded and connected to the outer wall of movable groove 43. The upper end of movable plate 46 is provided with a screw hole adapted to screw 44. Through the screw hole, screw 44 can pass through movable plate 46 and be threadedly connected to movable plate 46. Among them, the inlet flange 1 is provided, and the lower end of inlet flange 1 is provided with cylinder 2. The bottom of the inner wall of cylinder 2 is provided with sealing mechanism 3 to ensure sealing performance during filtration. In addition, one side of cylinder 2 is fixedly connected with anti-detachment mechanism 4 to prevent parts from accidentally falling off during operation. At the lower end of cylinder 2, a connecting Connecting flange 5, the lower end of which is fixed for easy installation and replacement of filter screen 6. The lower end of filter screen 6 is also detachable. Connecting flange 7 is used in conjunction with it. A mounting bracket 8 is fixedly connected to the other side of the cylinder 2. One side of the mounting bracket 8 is connected to a cover-opening cylinder 9 by a hinge, which allows the connecting flange 7 of the filter to be opened and closed easily when needed. The sealing mechanism 3 is one of the core parts of this slag discharge mechanism. The outer wall of the fixing ring 31 is firmly connected to the bottom of the inner wall of the cylinder 2. Multiple sliding holes 32 are opened on the upper inner wall of the fixing ring 31. The sliding holes 32 are equidistantly arranged along the upper circumference of the fixing ring 31. A sliding rod 33 is provided on the inner wall of the sliding hole 32. The upper end of the sliding rod 33 is fixedly connected to A limiting plate 34 is used to control the movement range of the slide rod 33. A spring 35 is sleeved on the outer wall of the slide rod 33. A sealing ring 36 is fixed to the lower end of the spring 35 to ensure the sealing effect. The upper inner wall of the fixing ring 31 is connected to the outer wall of the sliding hole 32 to ensure the sliding fit between the sliding hole 32 and the slide rod 33. At the same time, the upper end of the spring 35 is fixed to the lower end of the fixing ring 31, and the lower end of the spring 35 is fixed to the upper end of the sealing ring 36, thus forming a stable elastic sealing effect. The upper end of the cylinder 2 is fixed to the lower end of the inlet flange 1 to ensure the stability and reliability of the overall structure. The outer wall of the entire sealing mechanism 3 is firmly connected to the bottom of the inner wall of the cylinder 2, thereby ensuring the sealing performance of the filter during operation.

[0028] Then, the fixed support 41 is tightly joined to the cylinder 2 by welding. On the corresponding side of the fixed support 41, a mounting shell 42 is provided. The inner wall of the mounting shell 42 is provided with a movable groove 43. A screw 44 is rotatably connected to the inner wall of the mounting shell 42. One end of the screw 44 is fixedly connected to a handle 45, so that the operator can easily rotate the screw 44. A movable plate 46 is threadedly connected to the outer wall of the screw 44. A movable clamping plate 47 is fixedly connected to one side of the movable plate 46. In order to increase friction and provide protection, the inner wall of the movable clamping plate 47 is pasted with... A rubber pad 48 is added. Furthermore, one side of the fixed support 41 is fixedly connected to one side of the mounting shell 42, ensuring structural stability. The inner wall of the mounting shell 42 is connected to the outer wall of the movable groove 43 by embedding. This design ensures both mobility and tightness of connection. Finally, the upper end of the movable plate 46 is provided with a screw hole adapted to the screw 44, facilitating the rotation and fixing of the screw 44. During operation, the slag discharge mechanism is connected to the slag discharge port of the candle filter through the inlet flange 1 and fixed with bolts. When slag discharge is required, the cover-opening cylinder 9 is activated. The output end drives the filter screen 6 to move, and the connecting flange 7 drives the filter screen 6 to move simultaneously. When the filter screen 6 moves to a certain position, the filter screen 6 separates from the connecting flange 5. At this time, the filter cake falls through the filter screen 6 to the slag discharge port. At the same time, the sealing mechanism 3 seals the slag discharge port to prevent liquid leakage. When the sealing mechanism 3 needs to be replaced or repaired, the limit plate 34 is moved upward. The limit plate 34 drives the slide rod 33 to slide upward in the slide hole 32. The slide rod 33 compresses the spring 35, and the spring 35 is compressed. The spring 35 drives the sealing ring 36 to move upward. When the sealing ring 36 moves to a certain position, the sealing machine can be closed. The device can be easily replaced or repaired. When the candle filter needs to be fixed, the handle 45 is rotated, which drives the screw 44 to rotate inside the mounting housing 42. The screw 44 drives the movable plate 46 to move inside the mounting housing 42. The movable plate 46 drives the movable clamping plate 47 to move. When the movable clamping plate 47 moves to the appropriate position, the candle filter can be fixed, preventing it from falling off during use and improving the practicality of the device. The above is the working process of the entire device. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0029] 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 slagging mechanism for a candle filter, comprising an inlet flange (1), characterized in that: The lower end of the inlet flange (1) is provided with a cylinder (2), the inner wall bottom of the cylinder (2) is provided with a sealing mechanism (3), one side of the cylinder (2) is fixedly connected with an anti-dropping mechanism (4), the lower end of the cylinder (2) is welded with a connecting flange (5), the lower end of the connecting flange (5) is detachably connected with a filter screen (6), the lower end of the filter screen (6) is detachably connected with a connecting flange (7), the other side of the cylinder (2) is fixedly connected with a mounting bracket (8), one side of the mounting bracket (8) is hingedly connected with a cover opening cylinder (9). The sealing mechanism (3) comprises a fixed ring (31), the outer wall of the fixed ring (31) is fixedly connected with the inner wall bottom of the cylinder (2), the upper end inner wall of the fixed ring (31) is provided with a sliding hole (32), the inner wall of the sliding hole (32) is provided with a sliding rod (33), the upper end of the sliding rod (33) is fixedly connected with a limiting plate (34), the outer wall of the sliding rod (33) is sleeved with a spring (35), the lower end of the spring (35) is fixedly connected with a sealing ring (36).

2. The deslagging mechanism for a candle filter according to claim 1, characterized in that: The upper end inner wall of the fixed ring (31) is connected with the outer wall of the sliding hole (32), and the inner wall of the sliding hole (32) is connected with the outer wall of the sliding rod (33) in sliding mode.

3. The deslagging mechanism for a candle filter according to claim 2, characterized in that: The upper end of the spring (35) is fixedly connected with the lower end of the fixed ring (31), and the lower end of the spring (35) is fixedly connected with the upper end of the sealing ring (36).

4. The deslagging mechanism for a candle filter according to claim 1, characterized in that: The upper end of the cylinder (2) is fixedly connected with the lower end of the inlet flange (1), and the outer wall of the sealing mechanism (3) is fixedly connected with the inner wall bottom of the cylinder (2).

5. The deslagging mechanism for a candle filter according to claim 1, characterized in that: The anti-dropping mechanism (4) comprises a fixed support (41), one side of the fixed support (41) is welded with one side of the cylinder (2), one side of the fixed support (41) is provided with a mounting shell (42), the inner wall of the mounting shell (42) is provided with a movable groove (43), the inner wall of the mounting shell (42) is rotatably connected with a screw rod (44), one end of the screw rod (44) is fixedly connected with a rotating handle (45), the outer wall of the screw rod (44) is threadedly connected with a movable plate (46), one side of the movable plate (46) is fixedly connected with a movable clamping plate (47), the inner side wall of the movable clamping plate (47) is bonded with a rubber pad (48).

6. The deslagging mechanism for a candle filter according to claim 5, characterized in that: One side of the fixed support (41) is fixedly connected with one side of the mounting shell (42), and the inner wall of the mounting shell (42) is embeddedly connected with the outer wall of the movable groove (43).

7. The deslagging mechanism for a candle filter according to claim 5, characterized in that: The upper end of the movable plate (46) is provided with a screw hole matched with the screw rod (44).

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