Candle filter with efficient solid-liquid separation function

Abstract

The invention relates to the technical field of candle filters, and discloses a candle filter with efficient solid-liquid separation, which comprises a filter body, a plurality of filter elements connected in the filter body, a slag discharge box connected to the bottom of the filter body, and a flap valve connected to the bottom surface of the slag discharge box. Two groups of bottom plates and air bags which are staggered up and down and obliquely crossed are arranged in the slag discharging box, the air bags can buffer the impact force generated when a filter cake layer falls, gaps between the bottom plates ensure that filter cakes smoothly slide down, the distance between the bottom plate on the lowest layer and the flap valve is short, the impact force on the flap valve when the filter cake layer slides down is reduced, and the service life of the filter cake layer is prolonged. Therefore, the risk that the flap valve is damaged due to high-position falling is reduced. The bottom plate and the air bag are designed in a hinged mode, so that the filter can be conveniently stored when needed, the bottom plate and the air bag can be stored in a hinged mode, and normal use of the filter body is prevented from being affected.

Description

Technical Field

[0001] The present invention relates to the technical field of candle filters, and particularly to a candle filter with high-efficiency solid-liquid separation. Background Art

[0002] The candle filter is composed of multiple vertical filter elements (candle rods), and the surface is covered with filter cloth or sintered metal layer to achieve high-efficiency solid-liquid separation. When the liquid penetrates the filter medium from the outside to the inside, the solid particles are intercepted on the surface of the filter element to form a filter cake, and the clear liquid is discharged from the central pipe. Its modular structure provides a large filtration area, can handle liquids with high viscosity and high solid content, supports backwashing regeneration, is suitable for precision filtration in fields such as chemical industry and pharmacy, and has the advantages of high separation efficiency, strong operation continuity and convenient maintenance.

[0003] For example, the patent with the publication number CN102600652A discloses a candle filter for the inside of a reactor, which includes a filter cartridge and a filter layer sleeved outside the filter cartridge. A plurality of liquid inlets are opened on the filter cartridge, the filter layer is fixed outside the filter cartridge by a hoop, one end of the filter cartridge is inserted into a filter skeleton, a plurality of radial fins are fixed inside the filter skeleton, the fins longitudinally extend into the inside of the filter cartridge and support the filter cartridge, the other end of the filter cartridge is pressed on the filter skeleton by a filter upper cover fixed on the filter skeleton, and a liquid discharge port is opened at the other end of the filter skeleton.

[0004] Although the above device solves the problem of inconvenient backwashing, there are still the following defects: The slag discharge port of the candle filter is usually arranged at the bottom surface, and a pneumatic or electric flap valve is used to control the discharge of the filter residue. When the filter cake on the outer side of the filter element falls off due to gas vibration, a large amount of filter cake drops due to gravity and impacts the flap valve, which easily causes damage to the flap valve. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a candle filter with high-efficiency solid-liquid separation to solve the problems raised in the background art, so that the falling filter cake layer does not cause impact damage to the flap valve.

[0006] To achieve the above object, the present invention provides the following technical solution: A candle filter with efficient solid-liquid separation, comprising a filter body, a plurality of filter elements connected inside the filter body, a slag discharge box connected to the bottom of the filter body, and a flap valve connected to the bottom surface of the slag discharge box. The slag discharge box is rectangularly arranged and is vertically through. Both sides of the inner wall of the slag discharge box are hinged with a bottom plate. An air bag is connected to the top of the bottom plate. The two air bags are located below the plurality of filter elements. The two bottom plates and the air bags are inclined and misaligned. Two symmetrically arranged bottom blocks are fixedly connected to the bottom surface of the bottom plate. Fourth rotating shafts are fixedly connected to both sides of the outer wall of the bottom block. U-shaped plates hinged with the fourth rotating shafts are fixedly connected to both sides of the inner wall of the slag discharge box. Side grooves are opened on both sides of the inner wall of the slag discharge box. A lifting component for lifting the bottom plate is connected in the side grooves.

[0007] Further, the lifting component includes an outer rod and a piston rod. A fixed shaft is fixedly connected to the inner wall of the side groove. The end of the outer rod is sleeved outside the fixed shaft and is rotatably connected thereto. A sliding groove is opened in the inner wall of the outer rod. The piston rod is located in the sliding groove and is slidably connected thereto. An installation block is fixedly connected to the bottom surface of the bottom plate. The piston rod is rotatably connected to the installation block. A top column is fixedly connected to the bottom surface of the inner wall of the sliding groove. The bottom surface of the piston rod abuts against the top surface of the top column. Vent holes are respectively opened on both sides of the outer wall of the outer rod. A first air pipe and a second air pipe are respectively fixedly connected to the two vent holes. The outer end of the second air pipe passes through the outer wall of the slag discharge box and is connected with an external connection pipe. A solenoid valve is connected to the outer end of the external connection pipe and the second air pipe outside the slag discharge box. A telescopic pipe is connected between the second air pipe and the vent hole of the outer rod. The first air pipe passes through the bottom plate and is connected to the inner wall of the air bag. The outer ends of the two external connection pipes are both connected with a gas source device.

[0008] Further, a scraper is connected to the outer wall of the air bag. Sliders are fixedly connected to both ends of the scraper. Symmetrically arranged side plates are fixedly connected to the top of the bottom plate. Moving grooves corresponding to the sliders are opened in the side plates. End grooves are opened on both sides of the inner wall of the slag discharge box. A pulling component for driving the sliders to move is connected in the end grooves.

[0009] Further, the pulling component includes an I-shaped wheel located in the end groove. A first rotating shaft is rotatably connected in the end groove. The I-shaped wheel is fixedly sleeved on the outside of the first rotating shaft. A pull rope is wound inside the I-shaped wheel. Two symmetrically arranged pick rods are fixedly connected to the inner wall of the slag discharge box. Each pull rope bypasses the pick rod and is fixedly connected to the outer wall of the slider. A third rotating shaft is fixedly connected to the outer wall of one end of the fourth rotating shaft. A rotating part for driving the pull rope to wind up is connected to the outside of the third rotating shaft.

[0010] Furthermore, the rotating member includes a second rotating shaft, which is rotatably connected to the end groove, a large gear is provided on the outer wall fixed sleeve of the second rotating shaft, a small gear meshing with the large gear is provided on the outer side fixed sleeve of the first rotating shaft, and the small gear is located on one side of the I-wheel, a second pulley is provided on the outer side fixed sleeve of the second rotating shaft, a first pulley is provided on the outer side fixed sleeve of the second rotating shaft, and a transmission belt is provided on the outer side sleeves of the first pulley and the second pulley.

[0011] Furthermore, a counterweight is fixedly connected to the lower end of the scraper.

[0012] Furthermore, the cross section of the movable groove is T-shaped.

[0013] Furthermore, balls are fixedly connected to both sides of the outer wall of one end of the sliding block located in the moving groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This candle filter, which features efficient solid-liquid separation, incorporates two sets of staggered, tilted, and intersecting bottom plates and airbags within the discharge box. The airbags cushion the impact of the falling filter cake layer, while the gaps between the bottom plates ensure smooth sliding of the filter cake. The shorter distance between the lowest bottom plate and the flap valve reduces the impact of the falling filter cake layer on the flap valve, thereby minimizing the risk of damage to the flap valve due to a high-rise drop. The bottom plate and airbag are hinged for easy storage when needed, allowing for easy folding and unloading without affecting the normal operation of the filter body. 2. This candle filter with high-efficiency solid-liquid separation, through the coordinated design of the outer rod, piston rod, first air pipe and second air pipe, can use an external air source to inflate the outer rod. When the outer rod is filled with gas, it can push the piston rod upward, thereby supporting the bottom plate. The piston rod is lifted by the gas source, and when the filter cake layer impacts, the piston rod can provide stable support. At the same time, this process can also ensure that the air bag is fully replenished with gas at the same time to maintain its buffering function. 3. This candle filter with high-efficiency solid-liquid separation can easily scrape the surface of the airbag through the setting of the scraper to avoid the adhesion of filter residue, and thus can discharge the filter residue with less water content into the slag discharge box before the backwash operation; 4. This candle filter with high-efficiency solid-liquid separation can make the scraper reel in or loosen under the rotation of the I-wheel through the mutual cooperation of the fourth rotating shaft, the third rotating shaft, the pulley, the transmission belt, the large gear and the small gear. The scraper can be scraped by the rotation of the bottom plate, and the transmission between the large gear and the small gear can smoothly make the I-wheel wind multiple circles to ensure that the scraper's moving path is sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the slag discharge box and the flap valve of the present invention; Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the slag discharge box, side troughs and end troughs of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the two bottom plates and the airbag in which the airbag is tilted and deployed; Figure 5 It is a schematic diagram of the three-dimensional structure of the bottom plate and the airbag in the vertical state of the present invention; Figure 6 Schematic diagram of the three-dimensional cross-sectional structure of the base plate and the airbag of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the three-dimensional enlarged structure at A in the middle; Figure 8 Schematic diagram of the three-dimensional cross-sectional structure of the outer rod of the present invention; Figure 9 It is a schematic diagram of the three-dimensional structure of the lifting rod and scraper of the present invention; Figure 10 It is a schematic diagram of the three-dimensional structure of the lifting rod, the pull rope and the side plate of the present invention; Figure 11 It is a schematic diagram of the three-dimensional structure of the large gear, small gear and I-shaped wheel of the present invention; Figure 12 It is a schematic diagram of the three-dimensional structure of the slider and the ball of the present invention.

[0016] In the figure: 1. filter body; 2. slag discharge box; 3. flap valve; 4. solenoid valve; 5. external pipe; 6. bottom plate; 7. air bag; 8. scraper; 9. filter element; 10. lifting rod; 11. side groove; 12. end groove; 13. large gear; 14. I-shaped pulley; 15. U-shaped plate; 16. slider; 17. first rotating shaft; 18. small gear; 19. first pulley; 20. external rod; 21. piston rod; 22. first air pipe; 23. side plate; 24. movable groove; 25. pull rope; 26. mounting block; 27. second rotating shaft; 28. fixed shaft; 29. telescopic pipe; 30. bottom block; 31. top column; 32. second air pipe; 33. second pulley; 34. transmission belt; 35. third rotating shaft; 36. fourth rotating shaft; 37. ball; 38. counterweight. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] See also Figures 1-12, A candle filter with efficient solid-liquid separation, comprising a filter body 1, a plurality of filter elements 9 connected inside the filter body 1, a slag discharge box 2 connected to the bottom of the filter body 1, and a flap valve 3 connected to the bottom surface of the slag discharge box 2. The slag discharge box 2 is rectangular and is provided with an upper and lower through hole. Two bottom plates 6 are hinged to both sides of the inner wall of the slag discharge box 2. An airbag 7 is connected to the top of the bottom plate 6. The two airbags 7 are located below the plurality of filter elements 9. The two bottom plates 6 and the airbags 7 are inclined and misaligned. Two symmetrically arranged bottom blocks 30 are fixedly connected to the bottom surface of the bottom plate 6. Two fourth rotating shafts 36 are fixedly connected to both sides of the outer wall of the bottom block 30. U-shaped plates 15 hinged to the fourth rotating shafts 36 are fixedly connected to both sides of the inner wall of the slag discharge box 2. Side grooves 11 are opened on both sides of the inner wall of the slag discharge box 2. A jacking assembly for jacking up the bottom plate 6 is connected in the side grooves 11.

[0019] In the candle filter with efficient solid-liquid separation of the present invention, after the filter body 1 filters the turbid liquid into clear liquid and empties the inside, through the lifting of the jacking assembly, the two bottom plates 6 originally attached to the inner wall of the slag discharge box 2 are pushed up as Figure 4 , after the two bottom plates 6 are pushed up, they are in a misaligned state. At the same time, the airbag 7 is inflated. There is still a gap between the two misaligned bottom plates 6 and the airbag 7. At this time, the filter element 9 is blown back by gas, so that the filter cake caked on the outside of the filter element 9 is shattered by the gas and separated from the filter element 9. A large amount of the filter cake layer will first fall onto one of the higher airbags 7, and then part of it will fall onto the lower airbag 7, and then slide down on the gap between the two bottom plates 6 and fall onto the flap valve 3. Since the airbag 7 can buffer the impact force, and the distance between the airbag 7 and the flap valve 3 is short, after sliding down, the flap valve 3 is no longer subjected to a strong impact, and the impact force of the filter cake layer is buffered by the two misaligned airbags 7; The slag discharge box 2 is set to be rectangular, so that the two bottom plates 6 and the airbag 7 can be smoothly tilted up and stored. After being tilted up, the state can not only buffer the impact force of the filter cake layer, but also ensure the smooth sliding of the filter cake layer. During normal use, the bottom plate 6 and the airbag 7 are in a contracted state, which does not affect the normal use of the slag discharge box 2; By configuring two bottom plates 6 and airbags 7 that are misaligned in height and inclined and crossed in the slag discharge box 2, not only can the airbag 7 effectively buffer the impact force generated when the filter cake layer falls, but also the gap reserved between the two bottom plates 6 ensures that the filter cake layer can slide smoothly. Since the distance between the lowermost bottom plate 6 and the flap valve 3 is short, the impact force of the filter cake layer sliding down on the flap valve 3 is reduced, thereby reducing the risk of damage to the flap valve 3 caused by high-altitude dropping. Moreover, the bottom plate 6 and the airbag 7 are designed in a hinged manner, so that they can be conveniently stored when needed, and the bottom plate 6 and the airbag 7 can be hingedly stored to avoid affecting the normal use of the filter body 1.

[0020] As a preferred technical solution of the present invention, the jacking assembly includes an outer rod 20 and a piston rod 21. A fixed shaft 28 is fixedly connected to the inner wall of the side groove 11. The end of the outer rod 20 is sleeved outside the fixed shaft 28 and is rotatably connected thereto. A sliding groove is formed in the inner wall of the outer rod 20. The piston rod 21 is located in the sliding groove and is slidably connected thereto. An installation block 26 is fixedly connected to the bottom surface of the bottom plate 6. The piston rod 21 is rotatably connected to the installation block 26. A top column 31 is fixedly connected to the bottom surface of the inner wall of the sliding groove. The bottom surface of the piston rod 21 abuts against the top surface of the top column 31. Vent holes are respectively formed on both sides of the outer wall of the outer rod 20. A first air pipe 22 and a second air pipe 32 are respectively fixedly connected to the two vent holes. The outer end of the second air pipe 32 passes through the outer wall of the slag discharge box 2 and is connected with an external connecting pipe 5. An electromagnetic valve 4 is connected to one end of the external connecting pipe 5 and the second air pipe 32 outside the slag discharge box 2. A telescopic pipe 29 is connected between the second air pipe 32 and the vent hole of the outer rod 20. The first air pipe 22 passes through the bottom plate 6 and is communicated with the inner wall of the airbag 7. The outer ends of the two external connecting pipes 5 are both connected with a gas source device.

[0021] Specifically, when it is necessary to lift the airbag 7 and the bottom plate 6 for buffering, inflation can be carried out through an externally connected gas source device. The gas source device can be the same gas source as the gas source for inflating the filter element 9. By using the gas source for inflating the filter element 9, the airbag 7 can also be provided with inflation ability. When the gas source device inflates, first open the electromagnetic valve 4 so that the two external connecting pipes 5 can communicate with the second air pipe 32. After the second air pipe 32 is ventilated, the piston rod 21 is jacked up. Since the outer rod 20, the piston rod 21 are rotatably connected to the side groove 11 and the installation block 26 respectively, when the distance between the piston rod 21 and the outer rod 20 is lengthened, the bottom plate 6 will be driven to rotate, and at the same time the outer rod 20 also rotates and tilts. When the piston rod 21 is ventilated, the airbag 7 is also inflated under the connection of the first air pipe 22, so that the airbag 7 is filled to ensure the buffering force. When the outer rod 20 rotates, the outer rod 20 drives the telescopic pipe 29 to stretch. This setting ensures the sealed connection between the second air pipe 32 and the slag discharge box 2 and also ensures the smooth rotation of the outer rod 20. When the bottom plate 6 rotates and tilts, the first air pipe 22 can also be a telescopic bellows pipe or reserve enough pipeline to avoid the bottom plate 6 being restricted by the length of the first air pipe 22 and unable to rotate and open. When it is necessary to retract the bottom plate 6 and the airbag 7, only need to pump air in the opposite direction, so that the second air pipe 32 pumps air, the sliding groove in the outer rod 20 is pumped air, forcing the piston rod 21 to retract, and at the same time the first air pipe 22 pumps air into the airbag 7 to contract the airbag 7. At the same time, the bottom plate 6 rotates back to its original state to complete the storage.

[0022] Through the collaborative design of the outer rod 20, the piston rod 21, the first air pipe 22 and the second air pipe 32, an external air source device can be used to inflate the outer rod 20. When the inside of the outer rod 20 is filled with gas, it can push the piston rod 21 to move upward, thereby lifting the bottom plate 6. The piston rod 21 is lifted by the air source and can provide stable support when impacted by the filter cake layer. At the same time, this process can also ensure that the airbag 7 is synchronously and sufficiently replenished with gas to maintain its buffering function.

[0023] As a preferred technical solution of the present invention, a scraper 8 is connected to the outer wall of the airbag 7. Both ends of the scraper 8 are fixedly connected with sliders 16. The top of the bottom plate 6 is fixedly connected with symmetrically arranged side plates 23. Moving grooves 24 corresponding to the sliders 16 are formed in the side plates 23. End grooves 12 are formed on both sides of the inner wall of the slag discharge box 2, and a pulling assembly for driving the sliders 16 to move is connected in the end grooves 12.

[0024] Specifically, in order to prevent the filter cake layer from adhering to the surface of the airbag 7, during the rotation of the bottom plate 6, the scraper 8 can be driven to slide. When the scraper 8 slides, the surface of the airbag 7 can be scraped, which is convenient for preventing the surface of the airbag 7 from adhering to residual filter cake slag. Compared with the later backwashing, it can reduce the re - mixing of the filter cake slag with less water content with water.

[0025] As a preferred technical solution of the present invention, the pulling assembly includes a winding wheel 14 located in the end groove 12. A first rotating shaft 17 is rotatably connected in the end groove 12. The winding wheel 14 is fixedly sleeved on the outer side of the first rotating shaft 17. A pull rope 25 is wound inside the winding wheel 14. Two symmetrically arranged pick - up rods 10 are fixedly connected to the inner wall of the slag discharge box 2. Each pull rope 25 bypasses the pick - up rod 10 and is fixedly connected to the outer wall of the slider 16. One end of the outer wall of the fourth rotating shaft 36 is fixedly connected with a third rotating shaft 35, and a rotating member for driving the winding of the pull rope 25 is connected to the outside of the third rotating shaft 35.

[0026] As a preferred technical solution of the present invention, the rotating member includes a second rotating shaft 27. The second rotating shaft 27 is rotatably connected in the end groove 12. A large gear 13 is fixedly sleeved on the outer wall of the second rotating shaft 27. A small gear 18 meshing with the large gear 13 is fixedly sleeved on the outside of the first rotating shaft 17. The small gear 18 is located on one side of the winding wheel 14. A second pulley 33 is fixedly sleeved on the outside of the second rotating shaft 27. A first pulley 19 is fixedly sleeved on the outside of the second rotating shaft 27. A transmission belt 34 is sleeved on the outside of the first pulley 19 and the second pulley 33.

[0027] As a preferred technical solution of the present invention, a counterweight 38 is fixedly connected to the lower end of the scraper 8.

[0028] Specifically, when the bottom plate 6 rotates, the fourth rotating shafts 36 on the outer walls of the two bottom blocks 30 on the bottom surface of the bottom plate 6 rotate accordingly. The fourth rotating shafts 36 drive the first pulley 19 through the third rotating shafts 35, and drive the second pulley 33 and the second rotating shaft 27 through the transmission belt 34. Finally, through the meshing of the large gear 13 and the small gear 18, the first rotating shaft 17 is driven to rotate, driving the winding drum 14 to wind the pulling rope 25. Under the restriction of the lifting rod 10, the pulling rope 25 drives the slider 16 to move in the moving groove 24 in the side plate 23; Since the large gear 13 is the driving wheel and meshes with the small gear 18, when the large gear 13 rotates a small half turn along with the fourth rotating shaft 36, using the transmission ratio, the small gear 18 can rotate multiple turns. Therefore, when the bottom plate 6 rotates upward to receive the falling filter cake layer, the scraper 8 can first rise to the top of the airbag 7. When the bottom plate 6 needs to rotate downward for storage, the fourth rotating shaft 36 rotates in the reverse direction. Through the transmission of the pulley and the gear, the winding drum 14 flips, loosening the pulling rope 25. After loosening, using the gravity of the counterweight 38, the bottom plate 6 is in a vertical state after storage, and the counterweight 38 pulls the scraper 8 back to its original position for the next use; Through the mutual cooperation of the fourth rotating shaft 36, the third rotating shaft 35, the pulleys, the transmission belt 34, the large gear 13 and the small gear 18, the scraper 8 can be wound or loosened under the rotation of the winding drum 14. By using the rotation of the bottom plate 6, the scraper 8 can be made to scrape. Moreover, the transmission between the large gear 13 and the small gear 18 can smoothly wind the winding drum 14 for multiple turns, ensuring that the moving path of the scraper 8 is sufficient.

[0029] As a preferred technical solution of the present invention, the cross-section of the moving groove 24 is T-shaped. This can prevent the slider 16 from detaching from the outside of the moving groove 24.

[0030] As a preferred technical solution of the present invention, two sides of the outer wall of one end of the slider 16 located in the moving groove 24 are fixedly connected with balls 37. When the slider 16 moves in the moving groove 24, the balls 37 can ensure that the sliding friction of the slider 16 is transformed into rolling friction, making the slider 16 slide more smoothly and ensuring the smooth scraping action of the scraper 8.

[0031] In the above structure, the solenoid valve 4 is an existing mature technology, so it will not be described in detail here.

[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A candle filter with efficient solid-liquid separation, comprising a filter body (1), a plurality of filter elements (9) connected within the filter body (1), a slag discharge tank (2) connected to the bottom of the filter body (1), and a flap valve (3) connected to the bottom surface of the slag discharge tank (2), characterized in that, The slag discharge box (2) is rectangular and vertically through. On both sides of the inner wall of the slag discharge box (2), there are hinge-connected bottom plates (6). At the top of the bottom plates (6), there are air bags (7). The two air bags (7) are located below a plurality of filter elements (9). The two bottom plates (6) and the air bags (7) are inclined and offset. On the bottom surface of the bottom plates (6), there are fixedly connected two symmetrically arranged bottom blocks (30). On both sides of the outer wall of the bottom blocks (30), there are fixedly connected fourth rotating shafts (36). On both sides of the inner wall of the slag discharge box (2), there are fixedly connected U-shaped plates (15) hinged to the fourth rotating shafts (36). On both sides of the inner wall of the slag discharge box (2), there are side grooves (11). In the side grooves (11), there is connected a jacking component for jacking up the bottom plates (6).

2. The candle filter with efficient solid-liquid separation according to claim 1, wherein The jacking component includes an outer rod (20) and a piston rod (21). On the inner wall of the side groove (11), there is fixedly connected a fixed shaft (28). The end of the outer rod (20) is sleeved outside the fixed shaft (28) and rotatably connected thereto. Inside the outer rod (20), there is a sliding groove. The piston rod (21) is located in the sliding groove and slidably connected thereto. On the bottom surface of the bottom plate (6), there is fixedly connected a mounting block (26). The piston rod (21) is rotatably connected to the mounting block (26). On the bottom surface of the inner wall of the sliding groove, there is fixedly connected a jacking post (31). The bottom surface of the piston rod (21) abuts against the top surface of the jacking post (31). On both sides of the outer wall of the outer rod (20), there are respectively provided vent holes. The two vent holes are respectively fixedly connected with a first air pipe (22) and a second air pipe (32). The outer end of the second air pipe (32) passes through the outer wall of the slag discharge box (2) and is connected with an external connecting pipe (5). At one end of the external connecting pipe (5) and the second air pipe (32) outside the slag discharge box (2), there is connected a solenoid valve (4). Between the second air pipe (32) and the vent hole of the outer rod (20), there is connected a telescopic pipe (29). The first air pipe (22) passes through the bottom plate (6) and is communicated with the inner wall of the air bag (7). The outer ends of the two external connecting pipes (5) are both connected with a gas source device.

3. The candle filter with efficient solid-liquid separation according to claim 2, characterized in that, On the outer wall of the air bag (7), there is connected a scraper (8). At both ends of the scraper (8), there are fixedly connected sliders (16). On the top of the bottom plate (6), there are fixedly connected symmetrically arranged side plates (23). Inside the side plates (23), there are provided moving grooves (24) corresponding to the sliders (16). On both sides of the inner wall of the slag discharge box (2), there are end grooves (12). In the end grooves (12), there is connected a pulling component for driving the sliders (16) to move.

4. The candle filter with efficient solid-liquid separation according to claim 3, characterized in that The pulling assembly includes a spool (14) located in the end slot (12). A first rotating shaft (17) is rotatably connected in the end slot (12). The spool (14) is fixedly sleeved on the outer side of the first rotating shaft (17). A pulling rope (25) is wound inside the spool (14). Two symmetrically arranged picking rods (10) are fixedly connected to the inner wall of the slag discharging box (2). Each pulling rope (25) bypasses the picking rod (10) and is fixedly connected to the outer wall of the slider (16). One end of the outer wall of the fourth rotating shaft (36) is fixedly connected to a third rotating shaft (35). A rotating member for driving the winding of the pulling rope (25) is connected to the outer side of the third rotating shaft (35).

5. The candle filter with efficient solid-liquid separation according to claim 4, characterized in that, The rotating member includes a second rotating shaft (27). The second rotating shaft (27) is rotatably connected in the end slot (12). A large gear (13) is fixedly sleeved on the outer wall of the second rotating shaft (27). A small gear (18) meshing with the large gear (13) is fixedly sleeved on the outer side of the first rotating shaft (17). The small gear (18) is located on one side of the spool (14). A second belt pulley (33) is fixedly sleeved on the outer side of the second rotating shaft (27). A first belt pulley (19) is fixedly sleeved on the outer side of the second rotating shaft (27). A transmission belt (34) is sleeved on the outer sides of the first belt pulley (19) and the second belt pulley (33).

6. The candle filter with efficient solid-liquid separation according to claim 5, characterized in that, A counterweight block (38) is fixedly connected to the lower end of the scraper (8).

7. A candle filter with efficient solid-liquid separation according to claim 6, characterized in that, The cross-section of the moving slot (24) is T-shaped.

8. A candle filter with efficient solid-liquid separation according to claim 7, characterized in that, Two sides of the outer wall of one end of the slider (16) located in the moving slot (24) are fixedly connected with balls (37).

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