Screen filtering device of sedimentation filtering centrifugal machine

Abstract

The invention relates to the technical field of settling and filtering centrifugal machine equipment, and discloses a settling and filtering centrifugal machine screen filtering device which comprises a rotor, a rotating rod is fixedly installed on one side of the rotor, a feeding pipe and a rotating drum are fixedly installed on the other side of the rotor, the rotating drum is installed outside the rotor, and the rotating drum is formed by combining a settling section, a conical section, a filtering section and a discharging section. The inner wall of the filtering section is fixedly connected with a plurality of screen bars, the outer wall of the rotary drum is fixedly connected with a spiral blade and a filtering reinforcing assembly, the filtering reinforcing assembly comprises a filtering barrel wrapping the filtering section, a plurality of filtering holes are formed in the outer wall of the filtering barrel, the inner wall of the filtering barrel is fixedly connected with a keel frame, and the inner wall of the keel frame abuts against the outer walls of the screen bars. The technical means that the filter cartridge, the keel frame and the filter section grate bars are matched is adopted, deformation is prevented through abutting of the keel frame, the defects that an existing screen filtering device is prone to deformation and unstable in filtering precision under high-speed centrifugation are overcome, and then the technical effects of guaranteeing the structural stability of the grate bars and improving the purity of filtrate are achieved.

Description

Technical Field

[0001] This invention relates to the field of sedimentation filtration centrifuge equipment technology, specifically to a sedimentation filtration centrifuge screen filtration device. Background Technology

[0002] Sedimentation centrifuges belong to the mineral processing industry and are mainly used for the dewatering of fine particulate materials, such as fine coal slime. In the coal mineral processing industry, sedimentation centrifuges are mainly used for the dewatering of fine coal slime, which is generally materials smaller than 0.5mm, such as flotation concentrate and flotation tailings in coking coal preparation plants, and coal slime in power coal preparation plants.

[0003] In traditional sedimentation centrifuges, the screen bars of the drum filter section are directly glued to the inner surface of the steel body of the screen section. A certain number of round or square holes are drilled in the steel body. Under the action of centrifugal force, water in the fine particles passes through the screen and outward through the round or square holes in the steel body. The fine particles are blocked by the screen and retained inside the equipment, thus achieving separation of material and water. The existing sedimentation centrifuges adopt an unequal diameter design for the sedimentation section and the filter section. The sedimentation section and the filter section are connected by a conical section. The sedimentation section mainly completes the sedimentation and separation of materials, the conical section mainly completes the pre-dehydration and connects the sedimentation section and the filter section, and the filter section mainly plays the role of dehydration. The advantage of this structure is that the drum and its assembly components can be disassembled and assembled in one direction.

[0004] Existing centrifuge drum screen filter sections suffer from problems such as low opening rate and small water permeability area. The material inside the equipment only permeates water at the openings, and cannot be dehydrated in other areas, resulting in low dehydration efficiency, poor dehydration effect, and high product moisture content. In addition, the screen bars in the filter section may break or be damaged during use. Due to the impact of the material and the centrifugal force, the screen bars are subjected to great stress and are easily damaged. Usually, if more than 20% of the screen bars are damaged, they need to be replaced. Replacing the screen bars requires complete disassembly of the drum to remove the drum filter section, which is extremely inefficient for disassembly and maintenance. Summary of the Invention

[0005] This invention provides a sedimentation filtration centrifuge screen filtration device to solve the problems mentioned in the background art, such as the low opening rate and small water permeable area of ​​existing centrifuge drum screen filters, which result in low dehydration efficiency, poor dehydration effect, and high product moisture content.

[0006] The present invention provides a sedimentation filtration centrifuge screen filtration device, including a rotor, a rotating rod fixedly installed on one side of the rotor, and a feed pipe fixedly installed on the other side of the rotor;

[0007] The drum is installed outside the rotor. The drum is composed of a sedimentation section, a cone section, a filtration section and a discharge section. The sedimentation section and the filtration section are connected by the cone section. The discharge section is connected to the side of the filtration section. Multiple screen bars are fixedly connected to the inner wall of the filtration section. Spiral blades are fixedly connected to the outer wall of the drum.

[0008] The base is used to hold the rotor of the installed drum;

[0009] The filter reinforcement assembly is configured as an openable and closable circular tube structure. The filter reinforcement assembly includes a filter cylinder covering the outside of the filter section. The outer wall of the filter cylinder has multiple filter holes. A keel frame is fixedly connected to the inner wall of the filter cylinder. The inner wall of the keel frame abuts against the outer wall of the screen bar.

[0010] Preferably, the outer wall of the rotor is symmetrically provided with discharge ports, the inner wall of the rotor is fixedly connected with a partition, the feed pipe is located inside the rotor and one end is fixedly connected with a hopper, the outer wall of the hopper is fixedly connected to the inner wall of the rotor, the partition and the hopper form a discharge cavity, and the discharge ports are opened corresponding to the position of the discharge cavity.

[0011] Preferably, the sedimentation section, cone section, filtration section, and discharge section are connected by threads in sequence.

[0012] Preferably, the sedimentation section has multiple water outlet holes on its side wall and the discharge section has multiple discharge ports on its outer wall.

[0013] Preferably, a control panel is fixedly installed on the outer wall of the base, and an anti-slip pad is fixedly connected to the bottom wall of the base.

[0014] Preferably, a protrusion is fixedly connected to the side wall of the opening and closing contact surface of the filter cartridge, and the protrusion is fixed by bolts. The outer diameter of the filter cartridge is the same as the outer diameter of the sedimentation section.

[0015] Preferably, a compression assembly is provided on the spiral blades located in the filter section. The compression assembly includes a compression airbag and an air pump. The inner wall of the compression airbag is fixedly connected to the outer wall of the rotor, and the compression airbag is arranged around the interval of the spiral blades. Multiple air inlet pipes are fixedly connected to the inner wall of the compression airbag. The air pump is fixedly installed inside the rotor, and an air delivery pipe is fixedly connected to the output end of the air pump. The air delivery pipe is connected to the air inlet pipe.

[0016] Preferably, the compression airbag can be made of polyurethane.

[0017] Preferably, the sedimentation section and the filtration section are not aligned.

[0018] Preferably, the diameter of the spiral blades gradually decreases from the sedimentation section to the discharge section.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention employs a combination of filter cylinder, keel frame, and filter section screen bars. The keel frame provides anti-deformation support, while the filter cylinder provides secondary filtration, thus overcoming the shortcomings of existing screen filtration devices that are prone to deformation and have unstable filtration accuracy under high-speed centrifugation. This achieves the technical effect of ensuring the stability of the screen bar structure and improving the purity of the filtrate.

[0021] 2. This invention employs a filter reinforcement component with an openable and closable circular tube structure that works in conjunction with a rotating drum. By utilizing the principle of convenient maintenance through opening and closing disassembly, it overcomes the shortcomings of existing filter components, such as complex disassembly and low cleaning and maintenance efficiency. This achieves the technical effect of quickly disassembling the filter cylinder and facilitating the maintenance and replacement of the screen bars and filter cylinder.

[0022] 3. This invention employs a combination of a compression airbag, an air pump, and spiral blades. It utilizes the synergistic effect of the airbag expanding and compressing the gaps between solid particles during the spiral blade conveying process to overcome the shortcomings of existing technologies, such as high moisture content of filtered solid particles and easy retention and clumping in the blade gaps. This achieves the technical effects of improving the dryness of solid materials, enhancing the smoothness of conveying, and reducing material residue. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall internal structure of the drum of the present invention;

[0025] Figure 3 This is a schematic diagram of the overall internal structure of the rotor of the present invention;

[0026] Figure 4 This is a schematic diagram of the overall structure of the filter section of the present invention;

[0027] Figure 5 This is a schematic diagram of the overall structure of the filter reinforcement component of the present invention;

[0028] Figure 6 This is a schematic diagram of the overall structure of the filter cartridge of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal flat structure of the filter cartridge of the present invention.

[0030] In the diagram: 100, rotor; 101, rotating rod; 102, feed pipe; 103, discharge port; 104, partition plate; 105, hopper;

[0031] 200. Rotary drum; 210. Sedimentation section; 211. Water outlet; 220. Conical section; 230. Filtration section; 231. Screen bar; 240. Discharge section; 241. Feed outlet;

[0032] 300. Base unit; 301. Control panel;

[0033] 400. Spiral blades;

[0034] 500. Filter reinforcement assembly; 510. Filter cylinder; 511. Protrusion; 520. Filter hole; 530. Keel frame; 600. Extrusion assembly;

[0035] 610. Compression airbag; 620. Air inlet pipe; 630. Air pump; 640. Air delivery pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] This invention discloses a sedimentation filtration centrifuge screen filtration device, such as... Figure 1-7 As shown, it includes a rotor 100, a rotating rod 101 fixedly installed on one side of the rotor 100, and a feed pipe 102 fixedly installed on the other side of the rotor 100;

[0038] It should be noted that the drum 200 is installed outside the rotor 100. The drum 200 is composed of a sedimentation section 210, a cone section 220, a filtration section 230 and a discharge section 240. The sedimentation section 210 and the filtration section 230 are connected through the cone section 220. The discharge section 240 is connected to the side of the filtration section 230. Multiple screen bars 231 are fixedly connected to the inner wall of the filtration section 230. Spiral blades 400 are fixedly connected to the outer wall of the drum 200.

[0039] It should be noted that the base 300 is used to hold the rotor 100, which is mounted on the drum 200;

[0040] Furthermore, the base 300 provides a stable mounting foundation for the rotor 100 and the drum 200, ensuring structural stability during high-speed rotation.

[0041] In addition, the filter reinforcement assembly 500 is configured as an openable and closable circular tube structure. The filter reinforcement assembly 500 includes a filter cylinder 510 covering the outside of the filter section 230. The outer wall of the filter cylinder 510 has multiple filter holes 520. The inner wall of the filter cylinder 510 is fixedly connected to a keel frame 530, and the inner wall of the keel frame 530 abuts against the outer wall of the screen bar 231.

[0042] Furthermore, the openable filter cartridge 510 structure facilitates subsequent disassembly, cleaning, or maintenance of the screen bar 231 and the filter cartridge 510.

[0043] The working principle of the above technical solution is as follows: During use, the base 300 stably supports the assembled core components. The rotor 100, drum 200, and filter reinforcement assembly 500 are coaxially mounted. According to the working principle of existing centrifuges, the rotor 100 and drum 200 are coaxial but at different speeds. The filter reinforcement assembly 500 has a closed cylindrical structure and is installed outside the drum 200, so that the frame 530 tightly abuts against the outer wall of the screen bars 231 of the filter section 230, and the filter cylinder 510 completely covers the filter section 230. Externally, an external drive mechanism connects to a rotating rod 101, driving the rotor 100 to rotate at high speed. The rotor 100 synchronously drives the external drum 200, spiral blades 400, and filter reinforcement assembly 500 to rotate together. The mixture to be processed is continuously fed into the drum 200 through the feed pipe 102, directly entering the sedimentation section 210 of the drum 200. The high-speed rotation of the drum 200 generates strong centrifugal force, causing the mixture to undergo centrifugal motion within the sedimentation section 210. Solid particles with a density greater than that of the liquid are rapidly thrown towards the sedimentation section 210 by the centrifugal force. The inner wall forms a preliminary sedimentation layer, where liquid and a small amount of fine particles are located in the inner region, achieving initial solid-liquid separation. After pretreatment in the sedimentation section 210, the material, under the action of centrifugal force, the spiral blades 400, and its own pressure, flows smoothly into the filtration section 230 through the cone section 220. As it passes through the cone section 220, the material is compressed, further removing internal moisture. The screen bars 231 on the inner wall of the filtration section 230 form a fine filtration channel, allowing liquid and unsettled fine particles to permeate outwards through the gaps in the screen bars 231, while larger solid particles are trapped by the screen bars. The 231 interception system uses synchronously rotating spiral blades 400 to push the intercepted solid particles along the filter section 230 to the side discharge section 240, thus completing the directional conveying of solid materials. By using the technical means of cooperating the spiral blades 400 on the outer wall of the drum 200 with the discharge section 240, and utilizing the material conveying principle of synchronously rotating and directionally pushing with the drum 200, the shortcomings of existing devices, such as the easy accumulation of solid particles in the filter section 230 and the unsmooth discharge, are overcome. This achieves the technical effects of efficient conveying and interception of solids, avoiding blockages, and ensuring continuous operation of the device.

[0044] Furthermore, during use, the frame 530 of the filter reinforcement component 500 continuously abuts against the outer wall of the screen bar 231, counteracting the deformation force of centrifugal force and material impact on the screen bar 231, ensuring the stability of the filtration gap of the screen bar 231. The liquid (containing trace fine particles) passing through the screen bar 231 is further filtered through the filter holes 520 on the outer wall of the filter cylinder 510 to complete secondary filtration, intercepting the remaining fine impurities and improving the purity of the final filtrate. Solid particles are collected by the discharge section 240 discharge device. The clean liquid after secondary filtration is discharged from the filter cylinder 510 through the filter holes 520, realizing solid-liquid separation. During subsequent maintenance, the openable filter reinforcement component 500 can be opened, the filter cylinder 510 can be disassembled, and the screen bar 231 and filter cylinder 510 can be cleaned or replaced.

[0045] This invention employs a segmented structure of the 200-section drum, combined with the high-speed rotation of the 100-section rotor. It utilizes the principles of centrifugal sedimentation pretreatment, directional guiding conveying, and filtration by the 231-section sieve to overcome the shortcomings of existing devices, such as easy clogging of single filtration and incomplete solid-liquid separation. This achieves the technical effect of first reducing the load through sedimentation and then performing precise filtration, thereby improving separation efficiency and solid retention.

[0046] This invention employs a combination of a filter cylinder 510, a frame 530, and sieve bars 231 in the filter section 230. The frame 530 provides abutment to prevent deformation, while the filter cylinder 510 provides secondary filtration, thus overcoming the shortcomings of existing screen filtration devices that are prone to deformation and have unstable filtration accuracy under high-speed centrifugation. This achieves the technical effect of ensuring the structural stability of the sieve bars 231 and improving the purity of the filtrate.

[0047] This invention employs a filter reinforcement component 500 with an openable and closable circular tube structure in conjunction with a rotating drum 200. By utilizing the convenient maintenance principle of openable and closable disassembly, it overcomes the shortcomings of existing filter components, such as complex disassembly and low cleaning and maintenance efficiency. This achieves the technical effect of quickly disassembling the filter cylinder 510 and facilitating the maintenance and replacement of the screen bar 231 and the filter cylinder 510.

[0048] In one specific embodiment: the outer wall of the rotor 100 is symmetrically provided with discharge ports 103, the inner wall of the rotor 100 is fixedly connected with a partition 104, the feed pipe 102 is disposed inside the rotor 100 and one end is fixedly connected with a hopper 105, the outer wall of the hopper 105 is fixedly connected to the inner wall of the rotor 100, the partition 104 and the hopper 105 form a discharge cavity, and the discharge ports 103 are opened corresponding to the position of the discharge cavity.

[0049] Furthermore, the material to be processed enters the hopper 105 inside the rotor 100 through the feed pipe 102. The hopper 105 evenly disperses the material into the interior of the rotor 100. When the rotor 100 rotates at high speed, the material passes through the discharge port 103 on the outer wall of the rotor 100 under the action of centrifugal force and directly enters the sedimentation section 210 of the drum 200, realizing the initial diversion of the material and reducing the load on the subsequent filtration section 230.

[0050] It should be noted that the sedimentation section 210, the cone section 220, the filtration section 230 and the discharge section 240 are connected by threads in sequence.

[0051] In addition, the sedimentation section 210 and the filtration section 230 are not aligned.

[0052] It should be noted that the diameter of the spiral blade 400 gradually decreases from the sedimentation section 210 to the discharge section 240.

[0053] Furthermore, the sedimentation section 210 receives the material entering from the discharge port 103 of the rotor 100. The centrifugal force generated by the high-speed rotation causes the solid particles to settle to the inner wall, while some liquid is discharged through the water outlet 211 on the side wall, completing the initial solid-liquid separation. The sedimentation section 210 and the filtration section 230 are designed with different diameters to form a sudden change in cross-section, which enhances the centrifugal sedimentation effect and avoids material retention.

[0054] Furthermore, the cone section 220 receives the sedimentation section 210 via a threaded connection, and the inclined structure guides the settled material to flow directionally towards the filtration section 230, reducing material residue.

[0055] Furthermore, the filter section 230 is threadedly connected to the cone section 220, the inner wall screen bar 231 performs fine filtration of the material, the keel frame 530 of the external filter reinforcement component 500 abuts against the screen bar 231 to prevent deformation, the filter cylinder 510 performs secondary filtration through the filter hole 520, and the outer diameter of the filter cylinder 510 is consistent with that of the sedimentation section 210 to ensure overall rotational balance.

[0056] Finally, the discharge section 240 is threadedly connected to the filter section 230. The diameter of the spiral blade 400 gradually decreases from the sedimentation section 210 to the discharge section 240 to adapt to the cross-sectional changes of the drum 200, accurately pushing the intercepted solid particles to the discharge section 240 and discharging them through the outer wall discharge port 241 to avoid accumulation and blockage.

[0057] It should be noted that multiple water outlets 211 are opened on the side wall of the sedimentation section 210, and multiple discharge ports 241 are opened on the outer wall of the discharge section 240.

[0058] In addition, a control panel 301 is fixedly installed on the outer wall of the base 300, and an anti-slip pad is fixedly connected to the bottom wall of the base 300. The control panel 301 of the base 300 can adjust parameters such as the speed of the rotor 100, and the anti-slip pad on the bottom wall enhances the stability during high-speed rotation.

[0059] Specifically, a protrusion 511 is fixedly connected to the side wall of the opening and closing contact surface of the filter cylinder 510. The protrusion 511 is fixed by bolts. The outer diameter of the filter cylinder 510 is the same as the outer diameter of the sedimentation section 210.

[0060] Furthermore, the filter cartridge 510 is opened and closed and fixed by the protrusion 511 and bolts, and is connected to the threaded connection of each section of the drum 200, which facilitates quick disassembly and cleaning of the screen bar 231, the filter cartridge 510 and each section component, reducing the difficulty of maintenance.

[0061] In one specific embodiment: a compression assembly 600 is provided on the spiral blade 400 located in the filter section 230. The compression assembly 600 includes a compression airbag 610 and an air pump 630. The inner wall of the compression airbag 610 is fixedly connected to the outer wall of the rotor 100, and the compression airbag 610 is arranged around the spiral blade 400. A plurality of air inlet pipes 620 are fixedly connected to the inner wall of the compression airbag 610. The air pump 630 is fixedly installed in the rotor 100, and the output end of the air pump 630 is fixedly connected to an air delivery pipe 640, which is connected to the air inlet pipes 620.

[0062] It should be noted that the compression airbag 610 can be made of polyurethane.

[0063] The working principle of the above technical solution is as follows: During the use of this invention, when the material is filtered by the screen bar 231 in the filtration section 230, the retained solid particles move towards the discharge section 240 under the push of the spiral blades 400. At this time, the air pump 630 is started, and the gas is transported to the air inlet pipe 620 through the air supply pipe 640. Finally, the gas is injected into the compression airbags 610 surrounding the spiral blades 400. The polyurethane compression airbags 610 expand after being inflated. The compression force generated by the expansion acts on the solid particles between the spiral blades 400, compressing the gaps between the particles and squeezing out the residual water (the water can be discharged through the filter holes 520 of the screen bar 231 and the filter cylinder 510). This process improves the dryness of solid materials and enhances the pushing force on particles. Combined with the directional conveying of the spiral blades 400, it prevents solid particles from lingering or clumping in the blade gaps, ensuring smooth conveying. The inner wall of the extrusion airbag 610 is fixed to the outer wall of the rotor 100 and rotates synchronously with the rotor 100, ensuring that the extrusion action matches the material conveying rhythm. Moreover, the polyurethane material has both elasticity and wear resistance, which can adapt to the dynamic extrusion requirements under high-speed rotation and extend the service life of the components. By using gas to drive the airbag to expand and extrude, it works synergistically with the spiral blades 400, enhancing the dehydration effect and conveying stability of solid materials without affecting the filtration process.

[0064] This invention employs a combination of a compression airbag 610, an air pump 630, and a spiral blade 400. By utilizing the synergistic effect of the airbag expanding and generating compression force, which compresses the gaps between solid particles during the conveying process of the spiral blade 400, this invention overcomes the shortcomings of existing technologies where the filtered solid particles have high moisture content and are prone to clumping and remaining in the blade gaps. This achieves the technical effects of improving the dryness of solid materials, enhancing the smoothness of conveying, and reducing material residue.

[0065] Furthermore, the present invention employs a polyurethane extrusion airbag 610 in conjunction with a rotor 100. By utilizing the principle of adapting the elastic material to dynamic extrusion and rotating synchronously with the rotor 100 to match the conveying rhythm, it overcomes the shortcomings of ordinary rigid extrusion components that are prone to wear and difficult to adapt to the dynamic extrusion requirements under high-speed rotation. This achieves the technical effect of ensuring the stability of the extrusion effect and extending the service life of the components.

[0066] The contents not described in detail in this description are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sedimentation filtration centrifuge screen filtration device, characterized in that, Comprising A rotor (100) is fixedly installed with a rotating rod (101) on one side, and with a feeding pipe (102) on the other side; A rotating drum (200) is installed outside the rotor (100), and is composed of a sedimentation section (210), a cone section (220), a filtering section (230) and a discharging section (240). The sedimentation section (210) is connected with the filtering section (230) through the cone section (220), and the discharging section (240) is connected to the side of the filtering section (230). A plurality of sieve bars (231) are fixedly connected to the inner wall of the filtering section (230), and helical blades (400) are fixedly connected to the outer wall of the rotating drum (200); A machine base (300) is used to place the rotor (100) with the installed rotating drum (200); A filtering reinforcement assembly (500) is provided as a round pipe structure that can be opened and closed. The filtering reinforcement assembly (500) includes a filtering cylinder (510) wrapped outside the filtering section (230). A plurality of filtering holes (520) are formed in the outer wall of the filtering cylinder (510), and a keel frame (530) is fixedly connected to the inner wall of the filtering cylinder (510). The inner wall of the keel frame (530) abuts against the outer wall of the sieve bar (231).

2. A screen filtration apparatus for a decanter centrifuge according to claim 1, wherein: A discharging port (103) is symmetrically formed in the outer wall of the rotor (100), and a partition plate (104) is fixedly connected to the inner wall of the rotor (100). The feeding pipe (102) is provided with a hopper (105) fixedly connected to one end inside the rotor (100). The outer wall of the hopper (105) is fixedly connected to the inner wall of the rotor (100), and the partition plate (104) and the hopper (105) form a discharging cavity. The discharging port (103) is formed at a position corresponding to the discharging cavity.

3. A screen filtration apparatus for a decanter centrifuge according to claim 1, wherein: The sedimentation section (210), the cone section (220), the filtering section (230) and the discharging section (240) are sequentially connected by threads.

4. A screen filtration apparatus for a decanter centrifuge according to claim 3, wherein: A plurality of water outlets (211) are formed in the side wall of the sedimentation section (210), and a plurality of discharging ports (241) are formed in the outer wall of the discharging section (240).

5. A filter screen assembly for a decanter centrifuge according to claim 1, wherein: A control panel (301) is fixedly installed on the outer wall of the machine base (300), and an anti-skid pad is fixedly connected to the bottom wall of the machine base (300).

6. A filter screen assembly for a decanter centrifuge according to claim 1, wherein: A protrusion (511) is fixedly connected to the side wall of the opening and closing contact surface of the filtering cylinder (510), and the protrusion (511) is fixed by bolts. The outer diameter of the filtering cylinder (510) is the same as the outer diameter of the sedimentation section (210).

7. A filter screen assembly for a decanter centrifuge according to claim 1 wherein: The extrusion assembly (600) is arranged on the spiral blade (400) of the filtering section (230), and the extrusion assembly (600) comprises an extrusion air bag (610) and an air pump (630), the inner wall of the extrusion air bag (610) is fixedly connected with the outer wall of the rotor (100), the extrusion air bag (610) is arranged around the interval of the spiral blade (400), a plurality of air inlet pipes (620) are fixedly connected with the inner wall of the extrusion air bag (610), the air pump (630) is fixedly installed in the rotor (100), the output end of the air pump (630) is fixedly connected with a gas conveying pipe (640), and the gas conveying pipe (640) is communicated with the air inlet pipe (620).

8. A filter screen assembly for a decanter centrifuge according to claim 7, wherein: The extrusion air bag (610) can be made of polyurethane material.

9. A filter screen assembly for a decanter centrifuge according to claim 1 wherein: The precipitation section (210) and the filtering section (230) are arranged to be not diametrically opposite.

10. A filter screen assembly for a decanter centrifuge according to claim 1, wherein: The diameter of the spiral blade (400) gradually decreases from the precipitation section (210) to the discharging section (240).

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