Vertical power distribution cabinet convenient for internal cleaning

Abstract

The invention discloses a vertical power distribution cabinet convenient for internal cleaning, and belongs to the technical field of power distribution cabinets, the vertical power distribution cabinet comprises a cabinet body standing above the ground, the upper end of the cabinet body is fixedly provided with a motor, and the output end of the motor is fixedly provided with an adjusting screw rod; an adjusting seat is installed on the outer side of the adjusting lead screw, an air bag is fixedly connected between the adjusting seat and the inner wall of the lower end of the cabinet body, an air blowing assembly used for cleaning internal dust is installed on the adjusting seat, a collecting seat is fixedly installed at the lower end of the cabinet body, and through holes are formed between the lower end of the cabinet body and the upper end of the collecting seat; and a fixing frame is fixedly installed on the inner side of the collecting seat, and a blocking plate is installed on the fixing frame in a lifting mode. According to the vertical power distribution cabinet convenient for internal cleaning, multi-angle comprehensive blowing cleaning can be performed on the inner side of the cabinet body, and blown dust can be automatically filtered and collected, so that subsequent centralized treatment is facilitated, and the cleaning effect is effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution cabinets, and specifically to a vertical distribution cabinet that is convenient for internal cleaning. Background Art

[0002] In modern power systems, vertical distribution cabinets, as key end-stage equipment of the power distribution system, are widely used in multiple fields such as industry, commerce, residential buildings, and ships, and undertake the important responsibilities of power distribution, control, and protection. During the long-term use of the distribution cabinet, dust and other impurities are likely to enter the inner side. To avoid affecting the normal operation of power control, it is necessary to clean the inside of the cabinet body.

[0003] The prior art (Chinese patent with publication number: CN214044456U, publication date: August 24, 2021) discloses an internally self-cleaning distribution cabinet, which relates to the field of distribution cabinet equipment, including a main body. A motor is installed inside the main body, and the output end of the motor is connected to a rotating rod. A second bevel gear is sleeved on the outer wall of the rotating rod, and two sets of lead screws are arranged on one side of the rotating rod inside the main body. By setting a first bevel gear, a second bevel gear, a lead screw, and a brush, the output end of the motor rotates and drives the rotating rod to rotate. The rotating rod drives the first bevel gear to rotate through the second bevel gear, the first bevel gear drives the lead screw to rotate, and the lead screw drives the U-shaped plate to lower through the thread on the outer wall, so that the brush removes dust inside the main body, reducing the phenomenon of short circuit or open circuit of the internal circuit of the main body caused by dust, and then ensuring the normal operation of the electrical appliances inside the main body, and at the same time achieving the effect of facilitating the automatic cleaning of dust inside the distribution cabinet; The prior art (Chinese patent with publication number: CN207057175U, publication date: March 2, 2018) discloses a cleaning device for a distribution cabinet, including a cabinet body, a blowing device arranged on the cabinet door of the cabinet body, and a vacuum cleaner communicated with the cabinet body. The blowing device includes a plurality of horizontally arranged blowing rods and an air inlet pipe. Two rows of connecting seats are arranged in parallel on the inner side of the cabinet door of the cabinet body. Both ends of the blowing rod are rotatably connected to the connecting seats on both sides through bearings. One end of the blowing rod is a closed end, and the other end is an open end. The air inlet pipe is vertically fixed on one side of the open end of the blowing rod. The air inlet pipe is provided with the same number of air outlet heads as the blowing rods. The air outlet heads are inserted into the open ends of the blowing rods, and the air outlet heads are rotatably connected to the blowing rods. The utility model can blow each layer of electrical components inside the cabinet body repeatedly at an angle, and can blow out the dust in the gaps, improving the cleaning effect; Although the existing distribution cabinets can achieve internal cleaning by blowing air, the blowing structure is fixed, making it impossible to blow and clean the inner side of the cabinet at multiple angles and positions, resulting in limited cleaning effect and certain usage defects. Summary of the Invention

[0004] The object of the present invention is to provide a vertical power distribution cabinet that is convenient for internal cleaning, so as to solve the problem in the above-mentioned background technology that the blowing structure of the vertical power distribution cabinet in the current market is fixed, making it impossible to blow and clean the inner side of the cabinet at multiple angles and positions, resulting in limited cleaning effect.

[0005] To achieve the above object, the present invention provides the following technical solution: A vertical power distribution cabinet that is convenient for internal cleaning, including a cabinet body standing above the ground. A motor is fixedly installed at the upper end of the cabinet body, and an adjusting screw rod is fixedly installed at the output end of the motor; An adjusting seat is installed on the outer side of the adjusting screw rod, and an air bag is fixedly connected between the adjusting seat and the inner wall of the lower end of the cabinet body. And a blowing component for cleaning the internal dust is installed on the adjusting seat. A collecting seat is fixedly installed at the lower end of the cabinet body, through holes are opened between the lower end of the cabinet body and the upper end of the collecting seat. And a fixing frame is fixedly installed inside the collecting seat. A blocking plate is installed on the fixing frame in a lifting manner, and a collecting frame is slidably pulled inside the collecting seat. And a filter plate is installed inside the collecting frame. A blower is installed on the collecting seat.

[0006] Preferably, the adjusting screw rod is in threaded connection with the adjusting seat, and the adjusting seat is slidably arranged in contact with the inner part of the cabinet body. And during the movement of the adjusting seat, the dust on the inner wall of the cabinet body is scraped and cleaned.

[0007] Preferably, during the lifting and adjusting process of the adjusting seat, the air bag is squeezed and stretched. And the lower end of the air bag is fixedly connected with an air suction pipe, and a filter screen structure is arranged at the pipe orifice of the air suction pipe. At the same time, the upper part of the air bag is communicated with an exhaust pipe. One-way valve structures are arranged in both the air suction pipe and the exhaust pipe.

[0008] Preferably, the blowing component includes a blowing nozzle elastically and rotatably installed on the outer side of the adjusting seat. And the blowing nozzle is rotatably connected and communicated with the exhaust pipe. And the opening of the blowing nozzle faces the electrical components inside the cabinet body.

[0009] Preferably, a transmission gear is fixedly installed on the outer side of the blowing nozzle, and a rack is fixedly installed inside the cabinet body. And the rack is meshed with the transmission gear. At the same time, multiple groups of tooth blocks are evenly arranged on the rack. And during the downward movement of the adjusting seat, the transmission gear drives the blowing nozzle to perform reciprocating elastic rotation through the meshing action.

[0010] Preferably, a baffle is slidably installed at the opening of the blowing nozzle, and a first spring is fixedly connected between the baffle and the blowing nozzle. And a second pulling rope is fixedly installed on the baffle. At the same time, the upper end of the second pulling rope is fixedly connected to the adjusting seat. During the rotation of the blowing nozzle, the second pulling rope pulls the baffle to elastically slide and adjust on the blowing nozzle to realize the adjustment of the size of the air outlet.

[0011] Preferably, a second spring is fixedly connected between the fixing frame and the plugging plate, and the plugging plate and the through hole are in interference sealing fit. A winding wheel is elastically rotatably connected below the plugging plate. A second pulling rope is fixedly connected to the outer side of the winding wheel. The upper end of the second pulling rope is fixedly connected to the adjusting seat. During the downward movement of the adjusting seat, the winding wheel elastically rotates to wind up the second pulling rope. When the adjusting seat moves up to the highest point, it pulls the plugging plate downward through the second pulling rope and the winding wheel to plug the through hole.

[0012] Preferably, the blower extracts the air inside the cabinet through the through hole, and the filter plate filters the air drawn in by the blower.

[0013] Preferably, a first magnet is fixedly installed at the lower end of the plugging plate, and a second magnet is fixedly installed on the upper surface of the filter plate. The positions of the first magnet and the second magnet are vertically corresponding, and the magnetic poles of their opposite surfaces are opposite. At the same time, the filter plate is made of an elastic material. The filter plate elastically vibrates under the magnetic force of the first magnet and the second magnet to prevent blockage.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The vertical power distribution cabinet convenient for internal cleaning can blow and clean the inside of the cabinet from multiple angles, and can automatically filter and collect the blown dust, which is convenient for subsequent centralized treatment, effectively ensuring the cleaning effect. The specific contents are as follows; 1. An adjusting seat, an airbag and a blowing nozzle are provided. The control motor is driven to rotate the adjusting screw rod, so that the adjusting screw rod drives the adjusting seat to move downward through threaded connection, so that the adjusting seat can scrape off the dust attached to the inner wall of the cabinet. At the same time, the adjusting seat will squeeze the airbag, so that the gas in the airbag is blown into the blowing nozzle through the exhaust pipe, and then blown out through the blowing nozzle to blow off the dust inside the cabinet; 2. A blowing nozzle and a baffle are provided. As the adjusting seat moves downward, the transmission gear outside the blowing nozzle will intermittently engage with multiple tooth blocks on the rack, thereby driving the blowing nozzle to perform reciprocating elastic rotation, so that the blowing nozzle can evenly blow air and remove dust inside the cabinet. When the blowing nozzle rotates, the first pulling rope will pull the baffle to move elastically, so as to synchronously adjust the air outlet aperture of the blowing nozzle to ensure that the electrical components inside the cabinet receive sufficient airflow when the blowing nozzle swings; 3. A blocking plate and a filter plate are provided. As the adjusting seat moves downward, the wire winding wheel can wind up the second pulling rope, so that the second pulling rope releases the downward pulling force on the blocking plate. At this time, the blocking plate moves upward elastically, opening the through hole. At this time, the first magnet and the second magnet gradually move away from each other, causing the filter plate to vibrate elastically, achieving the anti-blocking effect. Subsequently, the blower is started, and the dust and the like blown off by the air blowing nozzle can be extracted and filtered and collected through the filter plate. After the cleaning is completed, controlling the adjusting seat to move upward can cause the adjusting seat to pull the second pulling rope, causing the wire winding wheel to rotate elastically. When the second pulling rope fixedly connected to the outside of the wire winding wheel is completely unwound, the second pulling rope can pull the blocking plate downward through the wire winding wheel and block the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a front view structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the adjusting seat and the airbag installation of the present invention; Figure 3 is a structural schematic diagram of the connection between the adjusting screw rod and the adjusting seat of the present invention; Figure 4 is a structural schematic diagram of the connection between the adjusting seat and the air blowing nozzle of the present invention; Figure 5 is a structural schematic diagram of the air blowing nozzle and the baffle of the present invention; Figure 6 is a bottom view structural schematic diagram of the adjusting seat of the present invention; Figure 7 is a sectional view structural schematic diagram of the collection seat of the present invention; Figure 8 of the present invention Figure 7 is an enlarged structural schematic diagram at A in

[0016] In the figure: 1, cabinet; 2, motor; 3, adjusting screw rod; 4, adjusting seat; 5, airbag; 6, suction pipe; 7, exhaust pipe; 8, air blowing nozzle; 9, transmission gear; 10, rack; 11, baffle; 12, first spring; 13, first pulling rope; 14, collection seat; 15, through hole; 16, fixing frame; 17, blocking plate; 1701, wire winding wheel; 18, second spring; 19, second pulling rope; 20, blower; 21, collection box; 22, filter plate; 23, first magnet; 24, second magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment 1: The dust blowing structure of the existing vertical power distribution cabinet is fixed, and it is impossible to achieve uniform dust blowing inside, resulting in limited internal cleaning effect. To solve this technical problem, the following technical content is disclosed in this embodiment. Please refer to Figures 1 - 5 As shown in the figure; a vertical power distribution cabinet that is convenient for internal cleaning, including a cabinet body 1 standing above the ground, a motor 2 is fixedly installed at the upper end of the cabinet body 1, and an adjusting screw rod 3 is fixedly installed at the output end of the motor 2; An adjusting seat 4 is installed on the outer side of the adjusting screw rod 3, and an air bag 5 is fixedly connected between the adjusting seat 4 and the inner wall of the lower end of the cabinet body 1. And a blowing component for cleaning the internal dust is installed on the adjusting seat 4.

[0019] The adjusting screw rod 3 is in threaded connection with the adjusting seat 4, and the adjusting seat 4 is slidably arranged in contact with the inner wall of the cabinet body 1. During the movement of the adjusting seat 4, the dust on the inner wall of the cabinet body 1 is scraped and cleaned. During the lifting and lowering adjustment of the adjusting seat 4, the air bag 5 is squeezed and stretched. And the lower end of the air bag 5 is fixedly connected with an air suction pipe 6, and a filter structure is arranged at the pipe orifice of the air suction pipe 6. At the same time, the upper part of the air bag 5 is communicated with an exhaust pipe 7. One-way valve structures are arranged in both the air suction pipe 6 and the exhaust pipe 7. The blowing component includes a blowing nozzle 8 elastically and rotatably installed on the outer side of the adjusting seat 4. And the blowing nozzle 8 is rotatably connected and communicated with the exhaust pipe 7. And the opening of the blowing nozzle 8 faces the electrical components inside the cabinet body 1. A transmission gear 9 is fixedly installed on the outer side of the blowing nozzle 8. And a rack 10 is fixedly installed on the inner side of the cabinet body 1. And the rack 10 is meshed with the transmission gear 9. At the same time, multiple groups of tooth blocks are evenly arranged on the rack 10. And during the downward movement of the adjusting seat 4, the transmission gear 9 drives the blowing nozzle 8 to perform reciprocating elastic rotation through the meshing action. A baffle 11 is slidably installed at the opening of the blowing nozzle 8. And a first spring 12 is fixedly connected between the baffle 11 and the blowing nozzle 8. And a second pull rope 19 is fixedly installed on the baffle 11. At the same time, the upper end of the second pull rope 19 is fixedly connected to the adjusting seat 4. During the rotation of the blowing nozzle 8, the second pull rope 19 pulls the baffle 11 to elastically slide and adjust on the blowing nozzle 8 to realize the adjustment of the size of the air outlet.

[0020] When it is necessary to clean the inside of the cabinet body 1, control the motor 2 to drive the adjusting screw rod 3 to rotate, so that the adjusting screw rod 3 drives the adjusting seat 4 to move downward on the inner side of the cabinet body 1 through threaded connection. At this time, the adjusting seat 4 can cooperate with the cabinet body 1 to squeeze the air bag 5, so that the gas in the air bag 5 enters the blowing nozzle 8 through the exhaust pipe 7 and is blown out through the blowing nozzle 8, realizing the dust blowing treatment of the inside of the cabinet body 1. As the adjusting seat 4 moves downward, the transmission gear 9 outside the blowing nozzle 8 will intermittently engage with multiple tooth blocks on the rack 10, so that the blowing nozzle 8 performs synchronous elastic reciprocating rotation during the downward movement, enabling the blowing nozzle 8 to blow dust at multiple angles on the inner side of the cabinet body 1. At the same time, as the blowing nozzle 8 rotates, the first pull rope 13 will pull the baffle 11 to elastically slide on the blowing nozzle 8, thereby adjusting the air outlet diameter of the blowing nozzle 8, so that the electrical components are subjected to sufficient air flow during the rotation of the blowing nozzle 8, further ensuring the dust blowing effect. When the adjusting seat 4 moves upward and resets, the air bag 5 can inhale the filtered gas through the suction pipe 6 to ensure that blowing can be carried out again later.

[0021] Embodiment 2: The technical content disclosed in this embodiment is a further improvement based on the above Embodiment 1. The existing vertical power distribution cabinet is inconvenient for centralized collection and treatment of dust and impurities inside, making it easy to have residues after cleaning. To further solve this technical problem, the following technical content is disclosed in this embodiment, as Figures 6 - 8 shown; A collection seat 14 is fixedly installed at the lower end of the cabinet body 1, through holes 15 are opened between the lower end of the cabinet body 1 and the upper end of the collection seat 14, and a fixed frame 16 is fixedly installed inside the collection seat 14. A blocking plate 17 is installed on the fixed frame 16 in a lifting manner, and a collection frame 21 is arranged in a drawable manner inside the collection seat 14. A filter plate 22 is installed inside the collection frame 21, and a fan 20 is installed on the collection seat 14.

[0022] A second spring 18 is fixedly connected between the fixing frame 16 and the plugging plate 17, and the plugging plate 17 is in interference sealing fit with the through hole 15. A winding wheel 1701 is elastically rotatably connected below the plugging plate 17. A second pulling rope 19 is fixedly connected to the outside of the winding wheel 1701. The upper end of the second pulling rope 19 is fixedly connected to the adjusting seat 4. During the downward movement of the adjusting seat 4, the winding wheel 1701 elastically rotates to wind up the second pulling rope 19. When the adjusting seat 4 moves up to the highest point, it pulls the plugging plate 17 downward through the second pulling rope 19 and the winding wheel 1701 to plug the through hole 15. The fan 20 extracts the air inside the cabinet body 1 through the through hole 15, and the filter plate 22 filters the air drawn in by the fan 20. A first magnetic block 23 is fixedly installed at the lower end of the plugging plate 17, and a second magnetic block 24 is fixedly installed on the upper surface of the filter plate 22. The positions of the first magnetic block 23 and the second magnetic block 24 are arranged vertically corresponding to each other, and the magnetic poles of their opposite faces are opposite. At the same time, the filter plate 22 is made of an elastic material. The filter plate 22 elastically vibrates under the magnetic force of the first magnetic block 23 and the second magnetic block 24 to prevent blockage.

[0023] When the adjusting seat 4 moves downward, the plugging plate 17 will elastically move upward under the elastic force of the second spring 18, so that the plugging plate 17 releases the plugging of the through hole 15. As the adjusting seat 4 continues to move downward, the winding wheel 1701 can elastically rotate to wind up the second pulling rope 19. At the same time, the fan 20 is started, so that the fan 20 can extract the dust and the like blown off inside the cabinet body 1 through the through hole 15. When the airflow carrying dust passes through the collection frame 21, it will be filtered and collected by the filter plate 22. The filtered gas is discharged through the fan 20. When the cleaning inside the cabinet body 1 is completed, the adjusting seat 4 is controlled to move upward, so that the adjusting seat 4 pulls the second pulling rope 19, and the winding wheel 1701 unwinds the second pulling rope 19. When the second pulling rope 19 is completely unwound, the second pulling rope 19 will pull the winding wheel 1701 to drive the plugging plate 17 to elastically move downward, so as to realize the plugging of the through hole 15 and prevent the dust on the filter plate 22 from entering the cabinet body 1 again. As the plugging plate 17 moves downward, the first magnetic block 23 at its lower end will approach the second magnetic block 24, so that the filter plate 22 deforms and vibrates under the magnetic force, so as to realize cleaning the blockage, which is convenient for subsequent cleaning and filtering again. By pulling out the collection frame 21, the collected dust and impurities can be centrally processed.

[0024] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A vertical power distribution cabinet convenient for internal cleaning, comprising a cabinet body (1) standing above the ground. A motor (2) is fixedly installed at the upper end of the cabinet body (1), and an adjusting screw rod (3) is fixedly installed at the output end of the motor (2). It is characterized in that An adjusting seat (4) is installed on the outer side of the adjusting screw rod (3). An air bag (5) is fixedly connected between the adjusting seat (4) and the inner wall of the lower end of the cabinet body (1). A blowing component for cleaning internal dust is installed on the adjusting seat (4). A collecting seat (14) is fixedly installed at the lower end of the cabinet body (1). Through holes (15) are formed between the lower end of the cabinet body (1) and the upper end of the collecting seat (14). A fixing frame (16) is fixedly installed inside the collecting seat (14). A blocking plate (17) is installed on the fixing frame (16) in a lifting manner. A collecting frame (21) is arranged inside the collecting seat (14) in a drawable manner. A filter plate (22) is installed inside the collecting frame (21). A blower (20) is installed on the collecting seat (14).

2. The vertical power distribution cabinet convenient for internal cleaning according to claim 1, wherein: The adjusting screw rod (3) is in threaded connection with the adjusting seat (4). The adjusting seat (4) is arranged to slide inside the cabinet body (1) in a fitting manner. During the movement of the adjusting seat (4), the dust on the inner wall of the cabinet body (1) is scraped and cleaned.

3. The vertical power distribution cabinet convenient for internal cleaning according to claim 1, characterized in that: During the lifting adjustment of the adjusting seat (4), the air bag (5) is compressed and stretched. An air suction pipe (6) is fixedly connected to the lower end of the air bag (5). A filter screen structure is arranged at the pipe orifice of the air suction pipe (6). The upper part of the air bag (5) is communicated with an exhaust pipe (7). Check valve structures are arranged in both the air suction pipe (6) and the exhaust pipe (7).

4. The vertical power distribution cabinet convenient for internal cleaning according to claim 1, wherein: The blowing component includes a blowing nozzle (8) elastically and rotatably installed on the outer side of the adjusting seat (4). The blowing nozzle (8) is rotatably connected and communicated with the exhaust pipe (7). The opening of the blowing nozzle (8) faces the electrical components inside the cabinet body (1).

5. The vertical power distribution cabinet convenient for internal cleaning according to claim 4, wherein: A transmission gear (9) is fixedly installed on the outer side of the blowing nozzle (8). A rack (10) is fixedly installed inside the cabinet body (1). The rack (10) is meshed with the transmission gear (9). Multiple groups of tooth blocks are evenly arranged on the rack (10). During the downward movement of the adjusting seat (4), the transmission gear (9) drives the blowing nozzle (8) to perform reciprocating elastic rotation through the meshing action.

6. The vertical power distribution cabinet convenient for internal cleaning according to claim 5, wherein: A baffle (11) is slidably installed at the opening of the blowing nozzle (8). A first spring (12) is fixedly connected between the baffle (11) and the blowing nozzle (8). A second pulling rope (19) is fixedly installed on the baffle (11). The upper end of the second pulling rope (19) is fixedly connected to the adjusting seat (4). During the rotation of the blowing nozzle (8), the second pulling rope (19) pulls the baffle (11) to elastically slide and adjust on the blowing nozzle (8) to realize the adjustment of the size of the air outlet.

7. An upright power distribution cabinet facilitating internal cleaning according to claim 1, characterized in that: A second spring (18) is fixedly connected between the fixing frame (16) and the plugging plate (17), and the plugging plate (17) is in interference sealing fit with the through hole (15). A winding wheel (1701) is elastically rotatably connected to the lower side of the plugging plate (17). A second pulling rope (19) is fixedly connected to the outer side of the winding wheel (1701). The upper end of the second pulling rope (19) is fixedly connected to the adjusting seat (4). During the downward movement of the adjusting seat (4), the winding wheel (1701) elastically rotates to wind up the second pulling rope (19). When the adjusting seat (4) moves up to the highest point, it pulls the plugging plate (17) downward through the second pulling rope (19) and the winding wheel (1701) to plug the through hole (15).

8. The vertical power distribution cabinet convenient for internal cleaning according to claim 1, wherein: The fan (20) extracts the air inside the cabinet body (1) through the through hole (15), and the filter plate (22) filters the air drawn in by the fan (20).

9. The vertical power distribution cabinet convenient for internal cleaning according to claim 1, wherein: A first magnetic block (23) is fixedly installed at the lower end of the plugging plate (17), and a second magnetic block (24) is fixedly installed on the upper surface of the filter plate (22). The positions of the first magnetic block (23) and the second magnetic block (24) are arranged corresponding to each other up and down, and the magnetic poles of their opposite surfaces are opposite. At the same time, the filter plate (22) is made of an elastic material. The filter plate (22) elastically vibrates under the magnetic force of the first magnetic block (23) and the second magnetic block (24) to prevent blockage.

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