CN211133171U - Spiral filtering washing machine - Google Patents

Abstract

The utility model provides a spiral filtration washing machine, it is mainly by the spirochaeta, the filter-tank, head end frame board, head end bearing box, tail end frame board, tail end bearing box, the mother liquor chamber, the lotion chamber, the feed liquid fill, speed reducer and transmission constitute, in the spirochaeta rotates the in-process, the filter-tank slant upper direction transport of solid-liquid mixture along the slope, in the feed liquid transportation process, the mother liquor in the feed liquid sees through the filter-tank filtration separation, obtain surplus solid material, solid material is under the stirring and the transport action of spirochaeta, solid material granule is turned by the spirochaeta celessly, fully contact with the washing liquid that constantly spouts, realize replacement washing and repulping washing, wash solid phase impurity and liquid phase impurity in the solid material, solid material is discharged by the bin outlet after the washing, the machine realizes continuous filtration and continuous washing operation, and has simple structure, and high production capacity, Low energy consumption and long service life of the filter screen.

Description

Spiral filtering washing machine

Technical Field

The utility model belongs to a continuous filtration and continuous equipment of washing, in particular to adopt the filtration washing equipment that replacement washing and chemical pulp washing combined together.

Background

In the production processes of chemical industry, food, medicine, light industry and the like, a plurality of production products are obtained by a solid-liquid separation process, the production products inevitably contain other impurities, and part of the impurities are solid-phase impurities and are often wrapped on the surface of a crystal product or form mixed crystals with the crystal product; the other part is liquid phase impurity which is caused by mother liquid entrainment and is only attached to the surface of crystal lattice of crystal product or entrained among crystals. In order to separate out a product with higher purity, filtration separation and washing dehydration are required.

Washing is an important component in the solid-liquid separation process, and the purpose of washing is mainly 3: firstly, valuable filtrate is recovered from filter cakes, and the recovery rate of the filtrate is improved; secondly, washing liquid impurities in the filter cake to improve the purity of solid components in the filter residue; thirdly, valuable components or harmful impurities in the filter cake are dissolved by using a washing liquid. Washing is generally carried out in order to achieve one or more of the above objectives.

The following 2 ways are typical for cake washing: firstly, displacement washing, namely washing the surface of a filter cake by using washing liquid, and then infiltrating the washing liquid into pores of the filter cake to carry out the processes of displacement and mass transfer; and secondly, slurry re-washing, namely when the replacement washing method is ineffective, the filter cake is re-converted into slurry by using fresh washing liquid, and the slurry is re-filtered, wherein the process can be repeated for multiple times and is called slurry re-washing. If the resistance of the washing liquid passing through the filter cake is too large, so that the washing time is too long, or the filter cake is cracked due to dehydration stress, so that replacement washing cannot be carried out, the filter cake is subjected to repulping washing by using fresh washing liquid.

Generally speaking, for liquid-phase impurities caused by mother liquor entrainment, the displacement washing effect is good, the liquid-phase impurities are easy to wash and remove, and a displacement washing filter cake is kept relatively complete. For solid-phase impurities, the washing is difficult, the washing effect of the repulping is good, and the solid-phase impurities in the product are dissolved into a liquid phase by means of turbulent flow and stirring of fluid in the washing process. For products containing solid-phase and liquid-phase impurities, the washing process adopts a mode of combining displacement washing and repulping washing.

Currently, our country is mainly used for filter washing apparatuses as follows.

(1) Two-in-one filtering and washing machine: the system is introduced from abroad in eighty years of last century, the national creation is achieved, the product filtering, washing and mechanical unloading operation is completed in one device, the filtering and washing device is suitable for filtering and washing products containing solid-phase and liquid-phase impurities simultaneously, the intermittent operation is realized, continuous large-scale automatic production cannot be realized, and the fundamental limitation is met.

(2) Belt filter washer: the method can continuously filter and wash products, has low energy consumption and low noise, and has the defects of suitability for high-concentration filter pulp containing coarse particles, unsuitability for fine-particle low-concentration filter pulp, poor washing effect on products containing solid impurities, high equipment cost and large total investment.

(3) A vacuum drum filter: can be continuously and automatically operated, can effectively carry out filtration, washing and dehydration, and has clean operation site. The disadvantages are poor washing effect on products containing solid impurities, difficulty in processing slurry with large solid content and large particle characteristic change, complex equipment structure and difficult maintenance.

(4) A centrifuge: the centrifugal machine is a solid-liquid separation device which is widely used at present, in the centrifugal separation product process of the centrifugal machine, washing liquid can be introduced to wash filter cakes in the centrifugal machine, the centrifugal separation and washing can be realized by various centrifugal machines such as a siphon scraper discharging centrifugal machine, a single-stage piston pushing centrifugal machine, a two-stage piston pushing centrifugal machine and the like at present, and the piston pushing centrifugal machine is used more advanced, so that the centrifugal machine has the advantages of continuous operation, high production capacity and lower moisture content of the filter cakes; the disadvantages are poor washing effect on products containing solid impurities, complex equipment structure, difficult maintenance and expensive equipment; large washing water amount and high energy consumption cost.

In conclusion, the two-in-one filtering and washing machine is suitable for filtering and washing products containing solid-phase and liquid-phase impurities, but can only be operated intermittently and cannot be operated continuously; while the belt filter washing machine, the vacuum drum filter and the centrifuge have poor washing effect on products containing solid impurities. It can be seen that the filtering and washing machine in China is still relatively backward, and no continuous integrated filtering and washing machine is suitable for filtering and washing products containing solid-phase and liquid-phase impurities, so that the development of a high-efficiency low-energy continuous integrated filtering and washing machine is an urgent subject and has important significance.

Disclosure of Invention

In order to overcome the defects and insufficiency of the prior filtering and washing equipment at home, the utility model provides a spiral filtering and washing machine, which conveys solid-liquid mixture along the upward direction of an inclined filtering tank in the rotation process of a spiral body and continuously filters and washes the solid-liquid mixture.

The utility model discloses spiral filtration washing machine mainly comprises filter tank, spirochaeta, head end frame plate, head end bearing box, tail end frame plate, tail end bearing box, wash liquor chamber, mother liquor chamber, feed liquid fill, speed reducer, transmission etc..

The filtering tank of the spiral filtering washing machine of the utility model is of a U-shaped long groove structure and consists of a side plate and a filter screen, the lower end of the side plate is connected with the filter screen, and the filter screen is semicircular or circular-arc; a head end frame plate is fixed at the head end of the filter tank, and a head end bearing box is fixed on the head end frame plate; the tail end frame plate is fixed at the tail end of the filter tank, and a tail end bearing box is fixed on the tail end frame plate.

The spiral body consists of spiral blades and a rotating shaft, and two ends of the rotating shaft are respectively installed and fixed on the head end bearing box and the tail end bearing box. The distance between the helical blade on the helical body and the filter screen at the bottom of the filter tank is kept between 5 and 20 mm. A speed reducer mounting plate is mounted above the head end of the spiral filtering washing machine, and the speed reducer is mounted on the speed reducer mounting plate. The transmission device comprises a driving belt pulley, a transmission belt and a driven belt pulley, wherein the driving belt pulley is arranged on the shaft head of the speed reducer, the driven belt pulley is arranged on the shaft head at the head end of the rotating shaft, the transmission belt is connected with the driving belt pulley and the driven belt pulley to transmit power, the spiral body rotates under the driving action of the speed reducer, and the spiral blades push the materials to move obliquely upwards along with the rotation of the spiral body.

The utility model discloses spiral filtration washing machine filter-tank sets up mother liquor chamber outward and presss from both sides the cover with the lotion room and presss from both sides the cover, and mother liquor chamber is called as in the space between filter-tank and the mother liquor room clamp cover, and the lotion room is called as in the space between filter-tank and the lotion room clamp cover, sets up the baffle between lotion room and mother liquor room, prevents that mother liquor room and lotion room from colluding to be led to and to be mixed each other, and lotion room clamp cover and mother liquor room clamp cover are sealed by the apron connection with filter. A cover plate at the upper part of the washing liquid chamber is provided with a washing liquid chamber vacuumizing tube which is externally connected with a vacuumizing system, so that the washing liquid chamber keeps negative pressure vacuum, and the washing liquid can be quickly filtered through a filter tank under the condition of negative pressure vacuum; the mother liquor chamber is provided with a mother liquor vacuum-pumping tube on the upper cover plate, the mother liquor chamber is externally connected with a vacuum-pumping system, so that the mother liquor chamber keeps negative pressure vacuum, the mother liquor can be rapidly filtered through a filter tank under the negative pressure vacuum condition, the bottom of the washing liquor chamber is provided with a washing liquor outlet pipe for discharging the washing liquor in the washing liquor chamber, and the bottom of the mother liquor chamber is provided with a mother liquor outlet pipe for discharging the mother liquor in the mother liquor chamber.

In the filtration tank, the portion of the space connected to the mother liquor chamber is called a filtration stage, and the portion of the space connected to the washing liquor chamber is called a washing stage.

The utility model discloses spiral filtration washing machine tail end top sets up the feed liquid fill for store a certain amount of feed liquid, ensure continuous operation. The middle upper part of the spiral filtering washer is provided with a water spraying pipe which is used for spraying water to the materials in the filter tank to wash the materials.

The utility model discloses spiral filters washing machine working process is: the mixed liquid is added into a liquid hopper, the liquid spirally moves upwards along the filter tank in an inclined way under the action of the rotation of the spiral body, and the mother liquid in the liquid enters a mother liquid chamber through a filter screen at the bottom of the filter tank under the action of gravity and vacuum pumping in the process of conveying the liquid along the filtering section and is discharged to the next process through a mother liquid outlet pipe. After the feed liquid passes through the filtering section, most of mother liquid in the feed liquid is filtered and separated, the rest materials are solid materials, the solid materials enter the washing section under the stirring and conveying action of the spiral body, washing liquid is continuously sprayed into the solid materials through the water spray pipe, particles of the solid materials are continuously stirred by the spiral body, the sprayed washing liquid reversely flows with the solid materials under the action of gravity, the solid materials and the washing liquid are fully contacted, displacement washing and repulping washing are realized, the solid materials are washed to remove solid-phase and liquid-phase impurities, the washing liquid is filtered by the filter tank to enter the washing liquid chamber, and then the washing liquid is discharged to the next process through the washing liquid outlet pipe. In the process that the materials are conveyed to the discharging point from the washing liquid adding point, residual moisture in the solid materials is subjected to the action of gravity and the axial and radial extrusion action of the helical blades, and the residual moisture also flows downwards into the washing liquid chamber. The materials passing through the washing section are conveyed by the spiral body and discharged from the discharge port.

The utility model discloses spiral filtration washing machine main technical characteristics is through the stirring and the transport effect of spirochaeta, and solid material granule is ceaselessly turned by the spirochaeta, and the washing liquid that spouts becomes certain angle countercurrent flow with solid material under the action of gravity, and the washing liquid has both carried out replacement washing to solid material, has carried out the washing of the repulping against the current again simultaneously, can wash solid phase impurity and liquid phase impurity betterly.

The utility model discloses spiral filtration washing machine main technical feature is that the metal mills the screen cloth for use to the filter screen. Due to the spiral stirring and the conveying effect on materials, the filter screen is directly extruded by the materials to have a large effect, the filter screen is easy to damage or deform by extrusion, and the filter screen is made of a high-strength screen, so that the filter screen is made of a metal milling screen, the filter screen is provided with a plurality of parallel through grooves along the axial direction, and is provided with a head end connector, a tail end connector and a middle connector; the through groove penetrates through the wall plate, the cross section of the through groove is trapezoidal, and the short top edge of the trapezoid faces inwards; the through grooves are not penetrated at the head end connecting body, the tail end connecting body and the middle connecting body, and the through groove gap is designed to be 0.08-0.5mm according to the requirement of filtering precision. The metal milling screen has the advantages of high strength, wear resistance, long service life, difficult blockage, easy cleaning and wide temperature application range.

The spiral filtering washing machine of the utility model inclines upwards at a certain angle, and the included angle between the spiral filtering washing machine and the horizontal plane is usually 5-60 degrees, preferably 15-30 degrees, the included angle is large, and the material countercurrent washing effect is strong; the spiral filtering washing machine is supported and fixed by a front supporting leg and a rear supporting leg.

The utility model discloses spiral filtration washing machine can adopt to add the clear water from lotion room and mother liquor room bottom, and the back flush filter screen improves the filter effect, also can add compressed air from lotion room and mother liquor room bottom and blow stifled back flush filter screen.

The utility model discloses spiral filtration washing machine compares with the prior art equipment, has following advantage:

the first step, a spiral filtering and washing machine adopts a spiral blade to convey materials obliquely upwards, and in the conveying process, the materials are firstly filtered and separated by a filtering section to obtain mother liquor, then enter a washing section to be subjected to displacement washing and secondary slurry washing, and then discharge a solid-phase product; the continuous feeding, continuous filtering, continuous washing and continuous discharging integrated operation is realized, the defect that the existing two-in-one filtering and washing machine can only be operated intermittently is overcome, and the continuous filtering and washing integrated machine is universal equipment urgently needed in the industrial technical fields of modern chemical industry, petrochemical industry, pharmacy, light industry, food, agricultural and sideline product processing and the like.

Secondly, the filtering element of the spiral filtering washing machine adopts a milling screen, so that the strength is high, the wear resistance is high, the service life is long, the filtering process is not easy to block and is easy to clean, the temperature application range is wide, and the problem that other filtering elements are easy to damage or deform due to the spiral stirring extrusion effect is effectively solved.

And thirdly, the spiral filtering washing machine has good washing effect, solid materials are subjected to displacement washing through the stirring and conveying action of the spiral body, repulping washing is simultaneously carried out, and the countercurrent washing is adopted, so that solid-phase impurities and liquid-phase impurities can be better washed away, washing water is reduced, the washing efficiency is improved, and the defect that a belt filtering washing machine, a vacuum rotary drum filter and a centrifugal machine have poor washing effect on products containing the solid impurities is overcome.

And fourthly, the spiral filtering washing machine has wide adaptability to materials, can adjust the frequency conversion of the motor timely according to the change of the properties of the materials, adjust the spiral rotating speed, adjust the selection type of the filter screen, adjust the thickness of the filter cake and ensure the index of washing and filtering, thereby having wide adaptability to the change of the washing and filtering performance of the materials.

Fifthly, the spiral filtering washer has good filtering effect, and because the spiral blade ends have a floating effect on the formed filter cake, the filter cake cracks are eliminated, the filter cake filtering effect is good, and the solid-liquid separation is more thorough.

Sixth, the spiral filtering and washing machine integrates filtering, separating, washing and dewatering, and has large production capacity; high efficiency, low motor speed, low energy consumption and no noise or vibration basically.

Seventh, the spiral filtration washing machine is convenient to install, can be installed on the flat ground, and can also be installed on the floor.

Drawings

Fig. 1 is a schematic structural view of the spiral filtration washing machine of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a schematic structural diagram of a filter tank.

Fig. 4 is an enlarged schematic view of a partial structure I of the filter screen.

Fig. 5 is a top view of fig. 4.

Detailed Description

The present invention is described in further detail below with reference to the following description of the embodiments and the accompanying drawings, which are not intended to limit the present invention, and those skilled in the art can make various modifications or improvements according to the basic idea of the present invention, but all are within the scope of the present invention as long as they do not depart from the basic idea of the present invention.

As shown in fig. 1 and 2, the spiral filtration washing machine of the present invention is composed of a head end frame plate (1), a discharge pipe (2), a front support leg (3), a filter tank (4), a spiral body (5), a washing liquid chamber (6), a washing liquid chamber jacket (7), a washing liquid outlet pipe (8), a partition plate (9), a mother liquid chamber (10), a mother liquid chamber jacket (11), a rear support leg (12), a mother liquid outlet pipe (13), a tail end frame plate (14), a tail end bearing box (15), a cover plate (16), a liquid hopper (17), a mother liquid chamber vacuum-pumping pipe (18), a water-spraying pipe (19), a washing liquid chamber vacuum-pumping pipe (20), a head end bearing box (21), a speed reducer mounting plate (22), a speed reducer (23), a driving belt pulley (24), a driving belt (25) and a driven.

The utility model discloses spiral filtration washing machine level certain angle that inclines up is 5 to 60 with the horizontal plane contained angle usually, preferred 15-30, and spiral filtration washing machine is fixed by preceding landing leg (3) and back landing leg (12) supporting.

The utility model discloses spiral body (5) of spiral filtration washing machine comprise pivot (5-1) and helical blade (5-2), and pivot (5-1) both ends spindle nose is installed respectively and is fixed in head end bearing box (21) and tail end bearing box (15). The distance between the spiral blade (5-2) and the wall surface of the inner wall at the bottom of the filter tank (4) is kept between 5 and 20 millimeters, a speed reducer mounting plate (22) is mounted above the head end of the spiral filtering washing machine, and the speed reducer (23) is fixedly mounted on the speed reducer mounting plate (22). The driving belt pulley (24) is installed on the shaft head of the speed reducer (23), the driven belt pulley (26) is installed on the shaft head of the head end of the rotating shaft (5-1), the driving belt pulley (24) and the driven belt pulley (26) are connected through the transmission belt (25) to transmit power, and under the driving action of the speed reducer (23), the spiral body (5) rotates and pushes materials to move obliquely upwards.

As shown in fig. 1, 2 and 3, the filtering tank (4) of the spiral filtering washing machine of the present invention is a U-shaped elongated slot structure, and is formed by connecting one or more filtering nets (4-1) to the lower end of a side plate (4-2), the filtering net (4-1) is semicircular or arc-shaped, the head end of the filtering tank (4) is fixed with a head end frame plate (1), and the head end frame plate (1) is fixed with a head end bearing box (21); the tail end of the filter tank (4) is fixed with a tail end frame plate (14), a tail end bearing box (15) is fixed on the tail end frame plate (14), a feed liquid hopper (17) is arranged above the tail end of the spiral filtering washing machine and used for storing a certain amount of feed liquid and ensuring continuous operation, and a water spraying pipe (19) is arranged at the middle upper part of the spiral filtering washing machine and used for spraying water to the materials in the filter tank (4) to wash the materials.

A mother liquor chamber jacket (11) and a washing liquor chamber jacket (7) are arranged outside a filter tank (4), a space between the filter tank (4) and the mother liquor chamber jacket (11) is called a mother liquor chamber (10), a space between the filter tank (4) and the washing liquor chamber jacket (7) is called a washing liquor chamber (6), a partition plate (9) is arranged between the washing liquor chamber (6) and the mother liquor chamber (10), the washing liquor chamber jacket (7) and the mother liquor chamber jacket (11) are connected and sealed with the upper part of the filter tank (4) through a cover plate (16), a washing liquor chamber vacuumizing pipe (20) is arranged on the cover plate (16) on the upper part of the washing liquor chamber (6), a mother liquor chamber vacuumizing pipe (18) is arranged on the cover plate (16) on the upper part of the mother liquor chamber (10), a washing liquor outlet pipe (8) is arranged at the bottom of the washing liquor chamber (6) and is used for discharging washing liquor, and.

In the filtration tank (4), the space portion connected to the mother liquor chamber (10) is called a filtration stage (27), and the space portion connected to the washing liquid chamber (6) is called a washing stage (28);

the utility model discloses spiral filters washing machine working process is: the solid-liquid mixed feed liquid is added into a feed liquid hopper (17), under the rotation action of a spiral body (5), the feed liquid spirally moves along the upward direction of the filter tank (4) in an inclined way, under the action of gravity and vacuum pumping, the mother liquid in the feed liquid enters a mother liquid chamber (10) through a filter screen (4-1) at the bottom of the filter tank (4), and then is discharged through a mother liquid outlet pipe (13); after mother liquor in feed liquid is filtered and separated, the residual solid materials continue to spirally move upwards in an inclined mode under the stirring and conveying action of the spiral body (5), washing liquid is continuously sprayed into the solid materials through the water spraying pipe (19), solid material particles are continuously turned over by the spiral body (5), the washing liquid and the solid materials reversely flow and are fully contacted with each other to realize displacement washing and repulping washing, the washing liquid enters the washing liquid chamber (6) through the filtering tank (4) in a filtering mode and is discharged through the washing liquid outlet pipe (8), and the materials are conveyed through the spiral body (5) and are discharged through the discharging pipe (2).

As shown in fig. 3, 4 and 5, the filter screen (4-1) of the spiral filtering washing machine of the utility model is made of metal milling screen, the filter screen (4-1) is provided with a plurality of parallel through grooves (4-1-1) along the axial direction, the through grooves (4-1-1) penetrate through the wall plate, the filter screen (4-1) is provided with a head end connector (4-1-2), a middle connector (4-1-3) and a tail end connector (4-1-4); the cross section of the through groove (4-1-1) is trapezoidal, and the short top edge of the trapezoid faces inwards; the through groove (4-1-1) is not penetrated at the positions of the head connector (4-1-2), the middle connector (4-1-3) and the tail connector (4-1-4), and the gap of the through groove (4-1-1) is designed to be 0.08-0.5mm according to the requirement of filtering precision.

Claims (5)

1. A spiral filtering washing machine is technically characterized in that:

firstly, the spiral filtering washing machine consists of a head end frame plate (1), a discharge pipe (2), a front supporting leg (3), a filter tank (4), a spiral body (5), a washing liquid chamber (6), a washing liquid chamber jacket (7), a washing liquid outlet pipe (8), a partition plate (9), a mother liquid chamber (10), a mother liquid chamber jacket (11), a rear supporting leg (12), a mother liquid outlet pipe (13), a tail end frame plate (14), a tail end bearing box (15), a cover plate (16), a liquid hopper (17), a mother liquid chamber vacuumizing pipe (18), a water spraying pipe (19), a washing liquid chamber vacuumizing pipe (20), a head end bearing box (21), a speed reducer mounting plate (22), a speed reducer (23), a driving belt pulley (24), a driving belt (25) and a driven belt pulley (26);

secondly, the spiral body (5) consists of a rotating shaft (5-1) and spiral blades (5-2), two ends of the rotating shaft (5-1) are respectively fixedly installed on a head end bearing box (21) and a tail end bearing box (15), a speed reducer installation plate (22) is installed above the head end of the spiral filtering washing machine, the speed reducer (23) is fixedly installed on the speed reducer installation plate (22), a driving belt pulley (24) is installed on the shaft head of the speed reducer (23), a driven belt pulley (26) is installed on the head end shaft head of the rotating shaft (5-1), and a transmission belt (25) is connected with the driving belt pulley (24) and the driven belt pulley (26) to transmit power;

thirdly, a head end frame plate (1) is fixed at the head end of the filter tank (4), and a head end bearing box (21) is fixed on the head end frame plate (1); a tail end frame plate (14) is fixed at the tail end of the filter tank (4), a tail end bearing box (15) is fixed on the tail end frame plate (14), and a feed liquid hopper (17) is arranged above the tail end of the filter tank (4);

fourthly, a mother liquor chamber jacket (11) and a washing liquor chamber jacket (7) are arranged outside the filter tank (4), a space between the filter tank (4) and the mother liquor chamber jacket (11) is called as a mother liquor chamber (10), a space between the filter tank (4) and the washing liquor chamber jacket (7) is called as a washing liquor chamber (6), a partition plate (9) is arranged between the washing liquor chamber (6) and the mother liquor chamber (10), the washing liquor chamber jacket (7) and the mother liquor chamber jacket (11) are connected and sealed with the upper part of the filter tank (4) through a cover plate (16), a washing liquor chamber vacuumizing pipe (20) is arranged on the cover plate (16) on the upper part of the washing liquor chamber (6), a mother vacuumizing pipe (18) is arranged on the cover plate (16) on the upper part of the mother liquor chamber (10), a washing liquor outlet pipe (8) is arranged at the bottom of the washing liquor chamber (6) and is used for discharging washing liquor, and a;

fifthly, a water spraying pipe (19) is arranged at the middle upper part of the spiral filtering washing machine and is used for spraying water to the materials in the filtering tank (4) to wash the materials, the space part connected with the mother liquor chamber (10) in the filtering tank (4) is called a filtering section (27), and the space part connected with the washing liquor chamber (6) is called a washing section (28);

sixthly, the working process of the spiral filtering washing machine is as follows: the solid-liquid mixed feed liquid is added into a feed liquid hopper (17), under the rotation action of a spiral body (5), the feed liquid spirally moves along the upward direction of the filter tank (4) in an inclined way, and in the process of conveying the feed liquid in a filtering section (27), the mother liquid in the feed liquid enters a mother liquid chamber (10) through a filter screen (4-1) at the bottom of the filter tank (4) and is discharged through a mother liquid outlet pipe (13); after mother liquor in the feed liquid is filtered and separated, the residual solid materials continue to move obliquely upwards under the stirring and conveying action of the spiral body (5), in the conveying process of the feed liquid in the washing section (28), washing liquid is continuously sprayed into the solid materials by the water spraying pipe (19) to wash the solid materials, the washing liquid is filtered by the filter tank (4) to enter the washing liquid chamber (6), and then is discharged through the washing liquid outlet pipe (8), and the materials are conveyed to the discharge pipe (2) to be discharged.

2. The spiral filtration washer of claim 1, wherein: the filter tank (4) is formed by connecting one or a plurality of filter screens (4-1) with the lower ends of side plates (4-2), the filter screens (4-1) are semicircular or arc-shaped, the filter screens (4-1) are made of metal milled screen meshes, the filter screens (4-1) are provided with a plurality of through grooves (4-1-1) which are parallel to each other along the axial direction, the filter screens (4-1) are provided with head end connectors (4-1-2), middle connectors (4-1-3) and tail end connectors (4-1-4); the cross section of the through groove (4-1-1) is trapezoidal, the through groove (4-1-1) is not penetrated at the positions of the head end connector (4-1-2), the middle connector (4-1-3) and the tail end connector (4-1-4), and the gap of the through groove (4-1-1) is designed to be 0.08-0.5mm according to the requirement of filtering precision.

3. The spiral filtration washer of claim 1, wherein: through the stirring and conveying action of the spiral body (5), the solid materials are continuously turned over by the spiral body (5), the sprayed washing liquid reversely flows at a certain angle with the solid materials under the action of gravity, the washing liquid performs displacement washing on the solid materials and simultaneously performs countercurrent repulping washing, and solid-phase impurities and liquid-phase impurities can be well washed away.

4. The spiral filtration washer of claim 1, wherein: the spiral filtration washing machine is inclined upward at a certain angle, and the included angle between the horizontal plane and the spiral filtration washing machine is usually 5-60 degrees.

5. The spiral filtration washer of claim 1, wherein: the end of the helical blade (5-2) keeps 5-20 mm distance with the inner wall surface of the filter screen (4-1) at the bottom of the filter tank (4).

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