Vacuum filter with composite filter plate

Abstract

The utility model discloses a composite filter plate vacuum filter, which belongs to the technical field of vacuum filtration and comprises a tank body, a main shaft, an annular composite filter plate component, a lining vacuum tube component, a distributor, a height difference drainage water-ring vacuum pump, a U-shaped inner water spraying curtain flushing device and an active discharging device, the ceramic filter can be used for technical transformation of an existing ceramic filter, so that the ceramic filter meets the filtering requirement and can be continuously used, and the technical problems that fine-fraction materials are low in dewatering and filtering efficiency, tap water is used for backwashing, nitric acid and ultrasonic combined cleaning is needed, the stability of a vacuum system is not high, and a ceramic plate is difficult to clean can be thoroughly solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vacuum filtration, and particularly relates to a composite filter plate vacuum filter. BACKGROUND

[0002] With the development of social economy and the acceleration of industrialization process, the demand for mineral resources is also increasing. In view of the present situation of poor endowment of mineral resources, it is necessary to increase the development of available resources, and at the same time, to increase the exploitation and beneficiation technology research and development of difficult to use resources, so as to further stabilize the mineral resources reserves as an important material basis for promoting social development. Therefore, optimizing the allocation of mineral resources, improving the efficiency of wide use of mineral resources, and exploiting "poor, fine and miscellaneous" refractory ores to supplement the current resource demand, have become an effective way to alleviate resource shortage and economic development pressure.

[0003] Because "poor, fine and miscellaneous" refractory ores need higher dissociation degree to meet the separation between useful minerals and gangue minerals, the grinding fineness is greatly improved, and the grinding fineness-325 content is generally increased to more than 85%, and even the-400 content is increased to more than 80%, resulting in the phenomenon that the production process using a large number of ceramic filters has difficulty in filtering and dewatering operation, especially the following five problems: (1) the density of finer particle size material increases, and is easy to stratify, the concentration of slurry in the tank is not uniform, which causes the thickness of filter cake to be different, and the water content of product is unstable; (2) backflushing water affects the efficiency of ceramic filter, and water quality affects the service life of ceramic plate, which puts forward higher requirements for water quality; (3) combined cleaning of residual acid liquid corrodes vacuum iron pipeline, since the new environmental protection law is promulgated, the treatment cost of cleaning acid has been greatly increased, and even some concentrators are strictly ordered not to use nitric acid for cleaning; (4) the working air pressure of pneumatic ball valve of vacuum system is unstable, and sometimes the air valve cannot be normally opened; (5) the ceramic plate cannot handle materials with high silica sol content, and the capillary pore calcification is enriched, the combined cleaning effect is limited, and cannot be completely removed, which greatly shortens the service life of ceramic plate.

[0004] After retrieval, Chinese patent application CN205815263U discloses a disc type ceramic filter, as Figure 7As shown, including the base 7', the base 7' top end provided suction zone 6', suction zone 6' side connected backwashing zone 4'; backwashing zone 4' side connected to the discharge area 3', the discharge area 3' side connected to the drying zone 2'; suction zone 6' inside the slurry tank 10', slurry tank 10' side mounted scraper 14'; slurry tank 10' inside the ultrasonic device 5', slurry tank 10' shaft set main shaft 11'; main shaft 11' outside through stainless steel flange 12' connected with ceramic filter plate 13', ceramic filter plate 13' side through the connecting pipe 8' connected with the vacuum barrel 1' provided on the side of the drying zone 2'; suction zone 6' side through the connecting pipe 8' connected with the cleaning conveyor 9'. In use, the structure of the ceramic filter mainly includes: equipped with several groups of ceramic filter plate 13' disc rotor, suction and flushing effect of self-coupling switching phenomenon distribution head, prevent solid deposition agitator, eliminate the need for ceramic filter plate 13' adsorption of solid scraper 14', ceramic filter plate 13' abdominal cavity outside flushing and ultrasonic washing system, slurry tank 10' and operation program control system to maintain a certain level, filter operation, ceramic filter plate 13' due to the effect of vacuum, when the rotating immersion in the slurry tank 10' slurry liquid and down, the surface of the ceramic filter plate 13' shape a layer of solid particles accumulated layer, liquid through the ceramic filter plate 13' by distribution head switching into vacuum barrel 1', when the suction of the accumulated layer of ceramic filter plate 13' away from the slurry tank 10' liquid surface to form filter cake, due to the effect of vacuum continues to dewater, the filter cake is further dried, ceramic filter plate 13' disc rotor continues to rotate to the part equipped with scraper 14', the filter cake is unloaded, by belt conveyor to the required place, after unloading the filter cake ceramic filter plate 13' running position to reach the self-coupling switching with vacuum flow backwashing zone 4', forming from the inside to the outside of the ceramic filter plate 13' flushing effect, remove the particles blocked in the ceramic microporous, then re-immersed in the slurry, when the filter runs for a long time, the overall flushing of the ceramic filter plate 13' can be carried out, the reverse flushing liquid used can add chemicals, and cooperate with ultrasonic oscillation, to maintain the high efficiency of the filter. However, the patent can improve product quality, reduce transportation cost, environmental protection effect is obvious, because the filtrate is clear, can be reused, reduce emissions, in line with the current clean production of environmental protection trend, but still failed to solve the above five problems.

[0005] At present, there is no published related technology to show that the traditional ceramic filter can completely solve the five problems of low dewatering and filtering efficiency of fine particle material, using tap water for backwashing, using nitric acid and ultrasonic combined cleaning, low stability of vacuum system and difficulty in cleaning ceramic plate after certain technical transformation. Therefore, under the national policy environment of increasing mining of "poor, fine and miscellaneous" refractory ores and continuously improving environmental protection requirements of the concentrator, it is urgent to develop a new type of filter or a method of transforming the ceramic filter into a composite filter plate vacuum filter to meet the filtering demand and continue to use such ceramic filters. Content of the utility model

[0006] The utility model provides a kind of composite filter plate vacuum filter, and the problems of low dewatering and filtering efficiency of fine particle material, using tap water for backwashing, using nitric acid and ultrasonic combined cleaning, low stability of vacuum system and difficulty in cleaning ceramic plate can be effectively solved.

[0007] The technical scheme for solving the technical problems of the utility model is as follows:

[0008] The utility model discloses a kind of composite filter plate vacuum filter, it is characterized by including tank, main shaft, lining vacuum pipe assembly, distributor, high-difference liquid discharge water ring vacuum pump, U-shaped internal water curtain flushing device and active unloading device;The main shaft is movably arranged on tank, it is evenly spaced along length direction and is equipped with multiple annular composite filter plate assemblies;The distributor is located at one side of tank and corresponds with one end of main shaft, it is equipped with suction channel and air extraction passage below and above respectively in the top of tank on circumference, and reverse blowing passage is located at both sides of the top of tank;Each annular composite filter plate assembly is assembled by multiple composite filter plate units of isosceles trapezoidal shape covered with filter cloth, each composite filter plate unit includes the base plate with multiple air permeation passages being arranged at both sides, and the first connecting port is arranged in the inner end of base plate and is communicated with each air permeation passage;The lining vacuum pipe assembly includes multiple lining vacuum pipes being arranged along the circumference of main shaft, and each lining vacuum pipe is provided with connecting pipe being communicated with each composite filter plate unit position respectively, and the second connecting port is arranged at the end of each connecting pipe and is connected with corresponding first connecting port, and the second connecting port of each lining vacuum pipe is movably connected with distributor respectively;The high-difference liquid discharge water ring vacuum pump includes water ring vacuum pump and high-difference liquid discharge device being connected, and high-difference liquid discharge device is equipped with one drain pipe and two vacuum pipes being connected with suction channel and air extraction passage respectively;The U-shaped internal water curtain flushing device includes multiple U-shaped pipes being arranged below one side of reverse blowing passage and being located at both sides of each annular composite filter plate assembly respectively, and water inlet pipe is connected on each U-shaped pipe, and multiple groups of counter-attack type water jet nozzles are arranged on the inner side of U-shaped pipe;The active unloading device includes air compressor and gas storage tank being connected, and gas storage tank is connected with reverse blowing passage by air pipe, and air pipe valve is arranged on air pipe.

[0009] Further, the substrate outer end is provided with a groove, one end of the filter cloth is clamped to the groove through a fastening clamp strip, and the other end is fixed to the first connecting port through a sealing ring.

[0010] Further, the filter cloth is a 750g / m2 type filter cloth.

[0011] Further, the inner lining vacuum pipe has an inner diameter greater than that of the second connecting port, preferably not less than 2.45 times the inner diameter of the second connecting port.

[0012] Further, the inner lining vacuum pipe is provided with a wear-resistant plating layer with a thickness of 2mm on the inner side.

[0013] Further, the suction channel, the air suction channel and the reverse blowing channel are spaced apart by 2mm-5mm.

[0014] Further, the suction channel has a plane angle of 145°-160°, the air suction channel has a plane angle of 150°-170°, and the reverse blowing channel has a plane angle of 35°-45°.

[0015] Further, the air pipe valve is a trigger valve.

[0016] Compared with the prior art, the composite filter plate vacuum filter machine has the advantages of simple and reasonable structure, convenient and efficient use, strong practicability, and can be transformed on the existing ceramic filter machine which cannot meet the dehydration and filtration of fine particle materials; the composite filter plate unit is arranged to replace the original ceramic filter plate of the filter machine, so that the dehydration and filtration problem of fine particle materials can be effectively solved; the inner lining vacuum pipe is improved, the inner diameter is increased, and a wear-resistant plating layer is arranged, so that the air permeability and wear resistance of the inner lining vacuum pipe are effectively increased; the distributor is provided with three channels, and the plane angles and spacing distances of the channels are optimized, so that the suction of slurry, vacuum suction and unloading of the filter machine are effectively met; the differential height liquid discharge water ring vacuum pump is arranged, the vacuum pump with higher vacuum suction capacity and the differential height liquid discharge device are arranged, so that the negative pressure is formed by the differential height, and the filtrate is discharged automatically; the U-shaped internal water curtain washing device is arranged to replace the original ultrasonic cleaning device, so that the cleaning operation can be completed in a short time without any chemical cleaning agent, and the environmental protection requirement is met; the active unloading device is arranged, the original scraper unloading is replaced by the blowing unloading, and the operation effect is more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the utility model;

[0018] Figure 2 It is a structural schematic view of the composite filter plate unit (without filter cloth) of the utility model;

[0019] Figure 3The utility model discloses a ring composite filter plate assembly structure schematic diagram on the main shaft of filter machine.

[0020] Figure 4 The utility model discloses a lining vacuum pipe assembly structure schematic diagram on the main shaft of filter machine.

[0021] Figure 5 The utility model discloses a distributor structure schematic diagram.

[0022] Figure 6 The utility model discloses a U-shaped internal water curtain flushing device structure schematic diagram.

[0023] Figure 7 The utility model discloses a schematic diagram of prior ceramic filter.

[0024] Figures 1-6 Middle: 1, ring composite filter plate assembly;11, composite filter plate unit;12, air passage;13, groove;14, sealing ring;15, first connecting port;16, base plate;2, lining vacuum pipe assembly;21, connecting pipe;22, second connecting port;23, lining vacuum pipe;3, distributor;31, suction channel;32, air extraction channel;33, reverse blowing channel;4, high-difference liquid discharge water ring vacuum pump;41, water ring vacuum pump;42, high-difference liquid discharge device;421, vacuum pipe;422, liquid discharge pipe;5, U-shaped internal water curtain flushing device;51, U-shaped pipe;52, counterattack type water jet nozzle;53, water inlet pipe;6, active unloading device;61, air compressor;62, gas storage tank;63, air pipe;64, air pipe valve;7, tank;8, main shaft.

[0025] Figure 7 Middle: 1', vacuum barrel;2', drying area;3', unloading area;4', backwashing area;5', ultrasonic device;6', suction area;7', base;8', connecting pipe;9', cleaning conveyor;10', slurry tank;11', main shaft;12', stainless steel flange;13', ceramic filter plate;14', scraper. DETAILED DESCRIPTION

[0026] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort, fall within the scope of the present application. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning by those of ordinary skill in the art to which the present application belongs. The "upper", "lower", "left", "right", "front", "back" and the like used in the patent application specification and claims of the present application are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship also changes accordingly. The present application does not detail, all of which are well known to those skilled in the art.

[0027] Embodiment 1

[0028] As Figures 1-6As shown, the composite filter plate vacuum filter of the application comprises a tank 7, a main shaft 8, a ring-shaped composite filter plate assembly 1, an inner lining vacuum pipe assembly 2, a distributor 3, a high-difference liquid discharge water ring vacuum pump 4, a U-shaped inner water curtain flushing device 5 and a active unloading device 6. The main shaft 8 is movably arranged on the tank 7 and is uniformly spaced along the length direction and is provided with a plurality of ring-shaped composite filter plate assemblies 1. The ring-shaped composite filter plate assembly 1 is used to form filter cake by adsorbing filtrate in the tank 7 through vacuum suction. Each ring-shaped composite filter plate assembly 1 is assembled by a plurality of isosceles trapezoidal composite filter plate units 11 covered with filter cloth. Each composite filter plate unit 11 comprises a base plate 16 provided with a plurality of air permeable channels 12 on both sides. The inner end of the base plate 16 is provided with a first connecting port 15 in communication with each air permeable channel 12. Each composite filter plate unit 11 can be detachably installed on the outer side of the main shaft 8 by setting a flange plate or the like on the outer side of the main shaft 8 and can rotate with the main shaft 8. The main shaft 8 is provided with a driving device. The distributor 3 is arranged on one side of the tank 7 and corresponds to one end of the main shaft 8. The distributor 3 is provided with a suction channel 31 and an air suction channel 32 located below and above the top of the tank 7 respectively and a reverse air blowing channel 33 located on both sides of the top of the tank 7. The inner lining vacuum pipe assembly 2 comprises a plurality of inner lining vacuum pipes 23 arranged along the circumference of the main shaft 8. Each inner lining vacuum pipe 23 is provided with a connecting pipe 21 of the same specification in communication with each composite filter plate unit 11. The end of each connecting pipe 21 is provided with a second connecting port 22 connected with the corresponding first connecting port 15. The end of each inner lining vacuum pipe 23 close to the distributor 3 is provided with a second connecting port 22 movably connected with the distributor 3. The high-difference liquid discharge water ring vacuum pump 4 comprises a water ring vacuum pump 41 and a high-difference liquid discharge device 42 connected with each other. The high-difference liquid discharge device 42 is provided with a liquid discharge pipe 422 and two vacuum pipes 421 connected with the suction channel 31 and the air suction channel 32 respectively. The high-difference liquid discharge device 42 is used to extract filtrate and gas to form filter cake and discharge the filtrate by high-difference. The U-shaped inner water curtain flushing device 5 comprises a plurality of U-shaped pipes 51 arranged on the lower part of one side of the reverse air blowing channel 33 and located on both sides of each ring-shaped composite filter plate assembly 1. Each U-shaped pipe 51 is connected with a water inlet pipe 53 for connecting with a tap water source. The inner side of each U-shaped pipe 51 is provided with a plurality of groups of reverse jet nozzles 52 for spraying water to form a water curtain to clean the ring-shaped composite filter plate assembly 1. The active unloading device 6 is used to unload the filter cake on the outer side of each ring-shaped composite filter plate assembly 1 by blowing air. The active unloading device 6 comprises an air compressor 61 and an air tank 62 connected with each other. The air tank 62 is connected with the reverse air blowing channel 33 through an air pipe 63. The air pipe 63 is provided with an air pipe valve 64. The air pipe valve 64 is preferably a trigger valve.

[0029] In use, the filtrate containing fine particle material flows into the groove 7, the main shaft 8 is driven to rotate, and each ring-shaped composite filter plate assembly 1 is driven, the differential liquid discharge water ring vacuum pump 4, the U-shaped internal water curtain flushing device 5 and the active unloading device 6 are started, the filter and the suction channel corresponding groove area are the suction area, the area above the groove corresponding to the air suction channel is the drying area, the area corresponding to the reverse air blowing channel is the unloading area, and the area corresponding to the lower part of the reverse air blowing channel is the flushing area; when each ring-shaped composite filter plate assembly 1 is in the suction area, the filtrate is adsorbed into a filter cake outside the ring-shaped composite filter plate assembly 1 by the action of the differential liquid discharge water ring vacuum pump 4, and continues to dry in the drying area, and the extracted filtrate is discharged through the liquid discharge pipe 422 through the composite filter plate unit 11, the inner lining vacuum pipe 23, the distributor 3 and the vacuum pipe 421; the filter cake rotates to the unloading area, and the filter cake is unloaded from the ring-shaped composite filter plate assembly 1 through the reverse air blowing channel 33 by the active unloading device 6, and a belt conveyor can be arranged below this area to transport the unloaded material; the ring-shaped composite filter plate assembly 1 after unloading continues to be flushed by the U-shaped internal water curtain flushing device 5, and then the above process is repeated.

[0030] As a preferred embodiment, the outer end of the base plate 16 is provided with a groove 13, one end of the filter cloth is clamped in the groove 13 by a fastening clamp strip, and the other end is fixed to the first connecting port 15 by a sealing ring 14, so that the filter cloth is conveniently arranged outside the base plate 16, and the filter cloth is preferably a filter cloth with a specification of 750g / m2.

[0031] As a preferred embodiment, the inner diameter of the inner lining vacuum pipe 23 is greater than the inner diameter of the second connecting port 22, and is preferably not less than 2.45 times the inner diameter of the second connecting port 22, that is, the ventilation capacity of the inner lining vacuum pipe 23 can reach 6 times that of the second connecting port 22. Further, in order to improve the wear resistance of the inner lining vacuum pipe 23, a wear-resistant plating layer with a thickness of 2mm is arranged on the inner side of the inner lining vacuum pipe 23.

[0032] As a preferred embodiment, the suction channel 31, the air suction channel 32 and the reverse air blowing channel 33 of the distributor 3 are spaced apart by 2mm-5mm, the plane angle of the suction channel 31 is 145°-160°, the plane angle of the air suction channel 32 is 150°-170°, and the plane angle of the reverse air blowing channel 33 is 35°-45°, so that the requirements of the filter for suction, vacuum extraction and unloading are effectively met through the optimization of the plane angles and spacing distances of the channels.

[0033] Example 2

[0034] The filter is improved Figure 7Taking the existing disc ceramic filter as an example, this is a conventional ceramic filter. The vacuum tube and distributor in this disc ceramic filter are conventional equipment, namely ordinary stainless steel vacuum tubes and ceramic distributors. The connection method between the ceramic filter plate 13' and the vacuum tube is also a conventional setting. To enable this filter to meet the filtration needs of higher-level fine-particle materials, while keeping its main structure such as the tank and main shaft unchanged, it is improved as follows: Figures 1-6 The composite filter plate vacuum filter shown is configured as follows, referring to the arrangement of each component in Example 1:

[0035] 1. The ceramic filter plate 13' is modified into a composite filter plate unit 11 composed of a substrate 16 covered with filter cloth. An air-permeable channel 12 and a first connection port 15 are provided on the substrate 16 to replace the ceramic plate made of quartz sand, clay and other inorganic non-metallic materials through molding, high-temperature firing and other production processes. The filter cloth is a 750g / ㎡ type filter cloth. The outer ring size of the substrate 16 is designed to be exactly the same as that of the ceramic filter plate 13', so that a one-to-one full-size replacement can be completed in terms of geometric dimensions. The thickness is 4mm thinner than that of the ceramic filter plate 13', which is convenient for covering the filter cloth. At the same time, in order to facilitate the installation of the filter cloth, a groove 13 is provided at the outer end of the substrate 16. One end of the filter cloth is fastened to the groove 13 by a fastening strip, and the other end is fixed to the first connection port 15 by a sealing ring 14.

[0036] 2. Improve the original stainless steel vacuum tube of the ceramic filter by replacing it with an inner-lined vacuum tube 23, increasing the inner diameter and setting a 2mm thick wear-resistant inner lining. The inner diameter of the inner-lined vacuum tube 23 should be able to achieve 6 times the air flow rate of the original ceramic filter vacuum tube.

[0037] 3. Modify the original ceramic dispenser to Figure 1 and Figure 5 The distributor 3 shown has three channels arranged along the circumference: a suction channel 31, an air extraction channel 32, and a reverse air blowing channel 33. The interval between each channel is 2mm to 5mm. The plane angle of the suction channel 31 is set to 145° to 160°, the plane angle of the air extraction channel 32 is set to 150° to 170°, and the plane angle of the reverse air blowing channel 33 is set to 35° to 45°.

[0038] 4. Modify the original vacuum tank 1' to Figure 1 The high-difference drainage water ring vacuum pump 4 shown includes a water ring vacuum pump 41 and a high-difference drainage device 42 connected to each other. The high-difference drainage device 42 is equipped with a drainage pipe 422 and two vacuum pipes 421 that are respectively connected to the suction channel 31 and the air extraction channel 32. It is used to extract filtrate and gas to form a filter cake, and to discharge the filtrate by utilizing the height difference. The water ring vacuum pump 41 is preferably equipped with a pumping capacity of 6.8 times that of the original ceramic filter's compatible vacuum pump.

[0039] 5. Modify the original ultrasonic device 5' to Figure 1 and Figure 6 The U-shaped internal spray water curtain flushing device 5 shown includes multiple U-shaped pipes 51 located on the lower part of one side of the reverse air blowing channel 33 and on both sides of each annular composite filter plate assembly 1. Each U-shaped pipe 51 is connected to a water inlet pipe 53 for connecting to a tap water source. Multiple sets of counter-attack spray nozzles 52 are provided on the U-shaped inner side of each U-shaped pipe 51 for cleaning the annular composite filter plate assembly 1. The water inlet pipe 53 can be directly connected to a clean water supply pipeline with a water supply pressure ≥0.06MPa.

[0040] 6. Modify the original scraper 14' to Figure 1 The active unloading device 6 shown includes an air compressor 61 and an air tank 62 connected together. The air tank 62 is connected to the reverse blowing channel 33 through an air duct 63. An air duct valve 64 is provided on the air duct 63. The air duct valve 64 is preferably a trigger valve. The air compressor provides an air flow with a pressure of 0.04 to 0.05 MPa for blowing and unloading. The air tank 62 preferably has a volume of 1 m³ and a pressure resistance of 1.0 MPa.

[0041] In summary, the following beneficial effects can be achieved by using the composite filter plate vacuum filter in Example 1 or the modified ceramic filter in Example 2:

[0042] (1) The filtration vacuum can be kept stable within the range of 80±5kPa. When processing materials with a particle size of -0.074mm of 90%, the moisture content of the filter cake is less than 9.0%. When processing materials with a particle size of -0.043mm of 90%, the moisture content of the filter cake is less than 9.5%. When processing materials with a particle size of -0.037mm of 90%, the moisture content of the filter cake is less than 10.0%.

[0043] (2) The entire production process only requires rinsing with clean water. The automatic rinsing can be completed in just 15 minutes without the need to add any cleaning agent, which fully meets environmental protection requirements. The rinsing cycle is more than 12 hours, and the continuous production time is relatively long.

[0044] (3) Compared with conventional ceramic filters, when processing the same material, the filter cake thickness can be kept stable in the range of 8 to 15 mm, the filtration efficiency is increased by more than 50%, the cleaning time is shortened by 18%, and the operating efficiency is significantly improved.

Claims

1. A composite filter plate vacuum filter, characterized by, The utility model provides a kind of vacuum filter, including groove (7), main shaft (8), inner lining vacuum pipe assembly (2), distributor (3), high difference liquid discharge water ring vacuum pump (4), U type inner water curtain flushing device (5) and active unloading device (6);The main shaft (8) is movably arranged in groove (7), and it is evenly spaced along length direction and is provided with multiple annular composite filter plate assemblies (1);The distributor (3) is arranged in one side of groove (7) and corresponds with one end of main shaft (8), and it is provided with suction channel (31) and air extraction channel (32) respectively below and above the top of groove (7) along circumference, and reverse blowing channel (33) is located in both sides of the top of groove (7);Each annular composite filter plate assembly (1) is assembled by multiple composite filter plate units (11) of isosceles trapezoidal shape covered with filter cloth, and each composite filter plate unit (11) includes base plate (16) provided with multiple air permeation channels (12) in both sides, and the inner end of base plate (16) is provided with first connecting port (15) communicated with each air permeation channel (12);The inner lining vacuum pipe assembly (2) includes multiple inner lining vacuum pipes (23) arranged along the circumference of main shaft (8), and each inner lining vacuum pipe (23) is provided with connecting pipe (21) communicated with each composite filter plate unit (11) position respectively, and the end of each connecting pipe (21) is provided with second connecting port (22) connected with corresponding first connecting port (15), and the end of each inner lining vacuum pipe (23) close to distributor (3) is respectively provided with second connecting port (22) movably connected with distributor (3);The high difference liquid discharge water ring vacuum pump (4) includes water ring vacuum pump (41) and high difference liquid discharge device (42) connected, and the high difference liquid discharge device (42) is provided with one drain pipe (422) and two vacuum pipes (421) connected with suction channel (31) and air extraction channel (32) respectively;The U type inner water curtain flushing device (5) includes multiple U type pipes (51) arranged below one side of reverse blowing channel (33) and located in both sides of each annular composite filter plate assembly (1), and each U type pipe (51) is connected with water inlet pipe (53), and the inner side of U type is provided with multiple groups of counter-attack water jet nozzles (52);The active unloading device (6) includes air compressor (61) and gas storage tank (62) connected, and gas storage tank (62) is connected with reverse blowing channel (33) through air pipe (63).

2. The composite filter plate vacuum filter according to claim 1, characterized in that, The outer end of base plate (16) is provided with recess (13), one end of filter cloth is clamped in recess (13) through fastening clamp strip, and the other end is fixed in first connecting port (15) through sealing ring (14).

3. The composite filter plate vacuum filter of claim 1, wherein, The filter cloth is 750g / m2 type filter cloth.

4. The composite filter plate vacuum filter of claim 1, wherein, The inner diameter of inner lining vacuum pipe (23) is greater than the inner diameter of second connecting port (22).

5. The composite filter plate vacuum filter of claim 1, wherein, The inner lining vacuum pipe (23) is provided with wear-resistant plating layer with thickness of 2mm on the inner side.

6. The composite filter plate vacuum filter of claim 1, wherein, The suction channel (31), air extraction channel (32) and reverse blowing channel (33) are spaced 2mm-5mm between adjacent channels.

7. The composite filter plate vacuum filter of claim 1, wherein, The suction channel (31) has a plane angle of 145-160 degrees, the air extraction channel (32) has a plane angle of 150-170 degrees, and the reverse air blowing channel (33) has a plane angle of 35-45 degrees.

8. The composite filter plate vacuum filter of claim 1, wherein, The air pipe (63) is provided with an air pipe valve (64).

9. The composite filter plate vacuum filter of claim 8, wherein, The air pipe valve (64) is a trigger valve.

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