阅读说明：本技术 一种立式双层滤布循环压滤系统及其压滤方法 (Vertical double-layer filter cloth circulating filter pressing system and filter pressing method thereof ) 是由 李地超 朱迪 刘飞 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种立式双层滤布循环压滤系统及压滤方法,它包括机架,机架设置有双层滤布循环机构、滤板组,上压板、下压板、液压缸,上压板、下压板、液压缸与机架连接,滤板组的上端与上压板连接,其下端与下压板连接,液压缸与上压板或下压板连接,液压缸动作,上压板与下压板相互靠近,所述的双层滤布循环机构包括滤布Ⅰ、滤布Ⅱ,有各自的循环路径,双层滤布在滤板组上呈S形设置,把含水量较高的固体污泥夹在双层滤布中间运送到压滤板上,在通过对合挤压方式对相互叠加的多层压滤板进行压滤,使污泥进行脱水处理,相比较传统立式压滤机,结构设计巧妙,压滤效果好。(The invention discloses a vertical double-layer filter cloth circulating filter pressing system and a filter pressing method, which comprises a frame, wherein the frame is provided with a double-layer filter cloth circulating mechanism and a filter plate group, an upper pressing plate, a lower pressing plate and a hydraulic cylinder, the upper pressing plate, the lower pressing plate and the hydraulic cylinder are connected with the frame, the upper end of the filter plate group is connected with the upper pressing plate, the lower end of the filter plate group is connected with the lower pressing plate, the hydraulic cylinder is connected with the upper pressing plate or the lower pressing plate, the hydraulic cylinder acts, the upper pressing plate and the lower pressing plate are mutually close, the double-layer filter cloth circulating mechanism comprises a filter cloth I and a filter cloth II which have respective circulating paths, the double-layer filter cloth is arranged on the filter plate group in an S shape, solid sludge with higher water content is clamped between the double-layer filter cloth and conveyed to the filter pressing plate, the mutually superposed multilayer filter pressing plates are subjected to filter pressing in a folding extrusion mode, so that the sludge is dehydrated, compared with the traditional vertical filter press, the structural design is ingenious, the filter pressing effect is good.)

1. The utility model provides a vertical double-deck filter cloth circulation filter pressing system which characterized in that: the filter plate group comprises a frame, wherein the frame is provided with a double-layer filter cloth circulating mechanism, a filter plate group, an upper pressing plate, a lower pressing plate and a hydraulic cylinder, the upper pressing plate, the lower pressing plate and the hydraulic cylinder are connected with the frame, the upper end of the filter plate group is connected with the upper pressing plate, the lower end of the filter plate group is connected with the lower pressing plate, the hydraulic cylinder is connected with the upper pressing plate or the lower pressing plate, the hydraulic cylinder acts, and the upper pressing plate and the lower pressing plate are close to each other;

the filter plate group comprises a plurality of filter pressing plates, the filter pressing plates are horizontally arranged between an upper pressing plate and a lower pressing plate and are parallel to the upper pressing plate and the lower pressing plate, a direction-changing roller is arranged at one end of each filter pressing plate, an upper pressing surface is arranged on the filter pressing plate at the lowest part, the rest filter pressing plates comprise upper pressing surfaces and lower pressing surfaces, a gap is formed between the lower pressing surface of the upper filter pressing plate and the upper pressing surface of the lower filter pressing plate, and the gap is a filter cloth passing gap;

the double-layer filter cloth circulating mechanism comprises a filter cloth I, a filter cloth II, the filter cloth I and the filter cloth II are independent annular filter belts, respective circulating paths are arranged, driving rollers and tensioning rollers are arranged in the circulating paths, one end of a gap at the top of a filter plate group is a filter cloth inlet, one end of a gap at the bottom of the filter plate group is a filter cloth outlet, the filter cloth I and the filter cloth II are overlapped to form double-layer filter cloth before the filter cloth inlet, the double-layer filter cloth is arranged on the filter plate group in an S shape, the double-layer filter cloth enters the gap at the top of the filter plate group, the bend roller at one end of a first filter plate below the gap enters the upper gap of a second filter plate below the filter plate group, the bend roller at the other end of the second filter plate enters the gap above a third filter plate again, the bend roller reciprocates in the way until the double-layer filter cloth is discharged from the filter cloth outlet of the filter plate group, and the double-layer filter cloth is separated.

2. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: further, the filter cloth I and the filter cloth II are one of polyester filter cloth for a filter press, polypropylene filter cloth, chinlon filter cloth for a plate-frame filter press or vinylon filter cloth for a plate-frame filter press; the filter cloth I and the filter cloth II have the same width and are slightly narrower than the width of the filter pressing plate; the filter cloth I and the filter cloth II are driven to rotate by the driving roller and are respectively provided with a tensioning roller.

3. The vertical double-layer filter cloth circulating filter pressing system according to claim 2, wherein: the filter pressing plates are movably connected with each other and are stacked together or are unfolded to be parallel to each other.

4. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: the filter cloth import place ahead frame be provided with mud mouth down, mud mouth setting is directly over I route of filter cloth down, mud falls into on filter cloth I from mud mouth down.

5. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: the lower mud hole is horizontally arranged to the filter cloth I at the filter cloth inlet, and a carrier roller is arranged below the filter cloth I below the lower mud hole.

6. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: the filter cloth inlet is characterized in that a pre-pressing device is arranged on the frame in front of the filter cloth inlet and comprises an upper squeeze roller and a lower squeeze roller which are close to each other in parallel, and the upper squeeze roller and the lower squeeze roller are respectively in contact connection with the filter cloth II and the filter cloth I.

7. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: a cleaning device is arranged on a circulation path of the filter cloth I or the filter cloth II and is a spray head connected with a water source; a mud scraping device is arranged at a bend roller at the end part of the filter pressing plate at the outlet position of the bottommost filter cloth, so that the sludge adhered to the filter cloth I is removed; and a mud scraping device is arranged on the circulation path of the filter cloth II.

8. The vertical double-layer filter cloth circulating filter pressing system according to claim 1, wherein: the upper pressure surface and the lower pressure surface of the filter pressing plate are pressure-bearing surfaces, the upper pressure surface is provided with a water filtering groove, and the water outlet end of the water filtering groove is connected with a water drainage pipe; the filter pressing plate bend roller on be provided with filter cloth deviation correcting device, deviation correcting device include the fixed plate of bearing frame, fixed bearing seat, it has horizontal rectangular mounting hole to open on the fixed plate, fixed plate one end and filter pressing plate tip fixed connection, the other end is connected with the bearing frame through rectangular mounting hole, bearing frame one end sets up the jackscrew, touches the bearing frame through the jackscrew top, realizes rectifying to double-deck filter cloth.

9. A filter-pressing method using the vertical double-layer filter cloth circulating filter-pressing system according to any one of the preceding claims, wherein: the sludge is laid on the bottom filter cloth, the bottom filter cloth is driven by a driving mechanism, the upper filter cloth runs, the upper filter cloth covers the bottom filter cloth containing the sludge and is overlapped with the bottom filter cloth, the sludge is wrapped between the double-layer filter cloth, the double-layer filter cloth is fed into the filter plate group and surrounds the filter plate group, the double-layer filter cloth between the filter press plates is subjected to filter pressing and water removing operation in a mode of extruding the filter plate group, the double-layer filter cloth is separated at the filter cloth outlet of the filter plate group, and filter-pressed mud cakes drop along with the redirection of the lower filter cloth and the separation of the double-layer filter cloth at the redirection roller below the filter cloth outlet.

10. The vertical double-layer filter cloth circulating filter pressing method according to claim 9, characterized in that: the vertical double-layer filter cloth circulating press filtration system is utilized to uniformly spread solid sludge on the filter cloth I above the carrier roller, blanking is controlled intermittently, the filter cloth I is driven by the driving roller to rotate along with the sludge, the sludge is alternately spread on the filter cloth I, meanwhile, the filter cloth II rotates, the filter cloth II is close to the filter cloth I carrying the sludge at the position of the pre-pressing device, the thickness of the sludge between the double-layer filter cloth is regulated and controlled by adjusting the distance between the upper and lower squeezing rollers, the double-layer filter cloth after the pre-pressing device enters the filter plate group from the filter cloth inlet, the double-layer filter cloth coated with materials continuously enters the press filter plate along with the operation and continuous material distribution of the double-layer filter cloth, the driving roller stops moving until the double-layer filter cloth with the sludge rotates to the gap above the bottommost press filter plate in front of the discharge end, and the material distribution process is finished;

starting a hydraulic oil cylinder on the frame, supporting a lower pressure plate to drive a plurality of pressure filter plates to be gradually jacked upwards, gradually closing the pressure filter plates, jacking a filter plate group to an upper pressure plate along with the rising of the hydraulic oil cylinder, and gradually compacting the filter plate group, after keeping for 1-2 minutes, discharging the water after pressure filtration, descending the hydraulic oil cylinder, separating the superposed pressure filter plates one by one along with the descending of the oil cylinder, finally returning all the pressure filter plates to the original position, and finishing the pressure filtration process;

the driving system of the filter cloth I and the filter cloth II is started again to drive the double-layer filter cloth to operate, the filter cloth I and the filter cloth II at the filter cloth outlet are separated, the sludge which is subjected to filter pressing falls along with the redirection discharge of the bottom filter cloth I at the redirection roller at the lower filter cloth outlet, the sludge distribution is started at the sludge outlet when the driving system is started, the double-layer filter cloth stops operating after the sludge which is subjected to filter pressing is completely emptied, and meanwhile, the new round of distribution is completed.

Technical Field

The invention relates to the technical field of filter press equipment, in particular to a double-layer filter cloth circulating system of a vertical filter press for non-flowing sludge treatment and a filter pressing method thereof.

Background

The filter press is a mechanical solid-liquid separation device which utilizes a special filter medium to apply certain pressure to an object so as to dialyze liquid, is widely applied to the field of environmental protection and becomes important equipment for sewage and sludge treatment. The existing filter press mainly comprises: plate and frame filter presses, continuous belt filter presses.

The first type, plate and frame filter press discrete filter press and horizontal filter press, vertical plate and frame filter press basic structure mainly comprises top board, holding down plate, filter plate group, piston rod, pneumatic cylinder, frame and switch board etc. the pneumatic cylinder drives the top board to the holding down plate and is close to, and the filter plate group is extruded, as shown in fig. 4, this type of vertical filter press is a layer of filter cloth, the circulation is rotatory, for example the vertical filter press that patent number is 200920222556X.

The two same structural principles are that slurry with proper fluidity is injected into the multi-layer filter plates in a grouting mode, and a hydraulic closing mechanism extrudes the slurry to remove part of water in the slurry.

The disadvantage of this filter press approach is that: firstly, the method is only suitable for separating sludge water with strong fluidity, namely treating the sludge water with large water content, because a slurry pump is required for grouting; meanwhile, the grouting pipeline needs to be periodically maintained; the horizontal plate-and-frame filter press has extremely low efficiency in the mud cake treatment process after water pressing, and each layer of mud cake needs to be separated one by one;

the second type, continuous belt filter press, mainly comprises a driving device, a press roll, an upper filter belt, a lower filter belt, a filter belt tensioning device, a filter belt cleaning device, a discharging device, etc., as shown in fig. 5, the principle is as follows: the flocculated sludge is conveyed to a filter belt for concentration and gravity dehydration, free water is separated under the action of gravity to form sludge in a non-flowing state, then the sludge is clamped between an upper mesh belt and a lower mesh belt, and the sludge is gradually extruded under the action of small-to-large extrusion force and shearing force through a wedge-shaped prepressing area, a low-pressure area and a high-pressure area to achieve the maximum separation of sludge and water, and finally a filter cake is formed and discharged.

The disadvantages of this construction are: compared with the involution extrusion mode, the pressure of the press roll is smaller, the water content of the treated mud cake is high, the water content of the dewatered sludge is usually 65-80 percent,

for example, the composting process generally requires sludge with lower water content, if sludge is incinerated and treated in a centralized way, the sludge dehydration rate is high, so that the heat energy consumption can be greatly reduced, and the treatment cost of hazardous materials is reduced, therefore, the treatment of sludge cakes with higher water content has very high treatment cost.

Disclosure of Invention

The invention aims to solve the problems and provides a vertical double-layer filter cloth circulating filter pressing system and a filter pressing method thereof, solid sludge with high water content is clamped between double-layer filter cloth and conveyed to a filter pressing plate, and the superposed multilayer filter pressing plates are subjected to filter pressing in a closing and extruding mode, so that the sludge is dehydrated, and the water content of the sludge can be reduced to 60-45%.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

a vertical double-layer filter cloth circulating filter pressing system comprises a rack, wherein a double-layer filter cloth circulating mechanism, a filter plate group, an upper pressing plate, a lower pressing plate and a hydraulic cylinder are arranged on the rack, the upper pressing plate, the lower pressing plate and the hydraulic cylinder are connected with the rack, the upper end of the filter plate group is connected with the upper pressing plate, the lower end of the filter plate group is connected with the lower pressing plate, the hydraulic cylinder is connected with the upper pressing plate or the lower pressing plate, the hydraulic cylinder acts, and the upper pressing plate and the lower pressing plate are close to each other;

the filter plate group comprises a plurality of filter pressing plates, the filter pressing plates are horizontally arranged between an upper pressing plate and a lower pressing plate and are parallel to the upper pressing plate and the lower pressing plate, a direction changing roller is arranged at one end of each filter pressing plate, an upper pressing surface is arranged on the filter pressing plate at the lowest part, the rest filter pressing plates comprise upper pressing surfaces and lower pressing surfaces, a gap is formed between the lower pressing surface of the upper filter pressing plate and the upper pressing surface of the lower filter pressing plate, filter cloth passes through the gap, and the filter cloth is extruded between the two plate surfaces by the involution of the lower pressing surfaces and the upper pressing surfaces;

the double-layer filter cloth circulating mechanism comprises a filter cloth I and a filter cloth II, wherein the filter cloth I and the filter cloth II are independent annular filter belts and have respective circulating paths, the circulating paths are provided with a driving roller and a tension roller, one end of a gap at the top of a filter plate group is a filter cloth inlet, one end of a gap at the bottom of the filter plate group is a filter cloth outlet, the filter cloth I and the filter cloth II are overlapped together before the filter cloth inlet to form double-layer filter cloth, the double-layer filter cloth is arranged in the same way as the filter cloth belts of the traditional vertical filter press and is arranged in an S shape on the filter plate group, the double-layer filter cloth enters the gap at the top of the filter plate group and is redirected to enter the gap above a second filter press plate below the double-layer filter cloth I through a redirection roller at one end of a first filter press plate below the gap, and is redirected to enter the gap above a third filter press plate after passing through a redirection roller at the other end of the second filter press plate and reciprocates in the same way until the double-layer filter cloth outlet of the filter plate group, the double-layer filter cloth is separated.

Furthermore, the filter cloth I and the filter cloth II are one of terylene filter cloth for a filter press, polypropylene filter cloth, plate-and-frame filter press chinlon filter cloth or plate-and-frame filter press vinylon filter cloth, and have the characteristics of pressure resistance, flexibility and air permeability.

The filter cloth I and the filter cloth II have the same width and are slightly narrower than the width of the filter pressing plate.

The filter cloth I and the filter cloth II are driven to rotate by the driving roller, and the expansion degree is adjusted by the expansion roller.

Furthermore, the driving roller comprises a driving roller I and a driving roller II which are respectively connected with the filter cloth I and the filter cloth II in a driving manner, and tensioning rollers are respectively arranged on circulation paths of the filter cloth I and the filter cloth II; the drive roller may be replaced by a direction-changing roller on the filter plate group.

The filter pressing plates are movably connected with each other and can be stacked together or unfolded to be parallel to each other.

The concrete connection mode between the filter pressing plates adopts the connection mode of the filter plate group of the traditional vertical filter press and a frame or a driving mechanism, is a known technology, and is not repeated in detail, and the hydraulic cylinder acts, the upper pressing plate is close to the lower pressing plate, and the filter plate group in the middle is overlapped and extruded.

Furthermore, the frame is still provided with guiding mechanism, the lateral surface at the pressure filter board is equipped with bellied ka tai, in the motion lifting direction of pneumatic cylinder, three is a set of on same vertical face, bellied ka tai length increases progressively, the ka tai of the top pressure filter board is the longest, correspondingly, be provided with recessed guide way in the frame of pressure filter board both sides, its position matches with the card platform displacement route of pressure filter board and corresponds, along the distolateral edge constitution step of the three guide way tank bottom of hydro-cylinder lifting direction, the horizontal degree of depth of guide way increases progressively. When the filtering pressure of the device is finished and the hydraulic cylinder falls back, the clamping table on the filter plate just falls on the bottom of the inner guide groove on the frame.

The filter cloth import place ahead frame be provided with mud mouth down, mud mouth setting is directly over I route of filter cloth down, mud falls into on filter cloth I from mud mouth down.

The lower mud hole is horizontally arranged to the filter cloth I at the filter cloth inlet, and a carrier roller is arranged below the filter cloth I below the lower mud hole.

A prepressing device is arranged on the machine frame in front of the filter cloth inlet and comprises an upper squeeze roller and a lower squeeze roller which are close to each other in parallel, and the upper squeeze roller and the lower squeeze roller are respectively in contact connection with the filter cloth II and the filter cloth I; the upper squeezing roller can be used as a driving roller of the filter cloth II.

The driving roller, the tensioning roller, the upper squeeze roller and the lower squeeze roller are all connected with the frame through bearing seats.

Furthermore, a cleaning device is arranged on a circulating path of the filter cloth I or the filter cloth II and is a spray head connected with a water source, the cleaning device continuously cleans the filter cloth when the double-layer filter cloth operates, and the cleaning system stops working when the filter cloth stops operating.

When the double-layer filter cloth operates, one end of the filter pressing plate is provided with a bend roller, a filter cloth deviation correcting device is arranged on the bend roller, the deviation correcting device comprises a bearing seat and a fixing plate of a fixing bearing seat, a transverse strip-shaped mounting hole is formed in the fixing plate, one end of the fixing plate is fixedly connected with the end part of the filter pressing plate, the other end of the fixing plate is connected with the bearing seat through the strip-shaped mounting hole, and the deviation correction of the double-layer filter cloth is realized through a jackscrew jacking bearing seat.

Furthermore, a mud scraping device is arranged at a bend roller at the end part of the filter pressing plate at the outlet position of the bottommost filter cloth, so that the sludge adhered to the filter cloth I is removed; furthermore, a mud scraping device is arranged on the filter cloth circulation path to realize the removal of the sludge on the surface of the filter cloth II; the mud scraping device is a scraper close to the surface of the filter cloth, and the width of the scraper is larger than that of the filter cloth.

A filter pressing method of a circulating filter pressing system utilizing vertical double-layer filter cloth comprises the steps of paving sludge on bottom filter cloth, driving the bottom filter cloth and upper filter cloth to operate by a driving mechanism, covering the upper filter cloth above the bottom filter cloth containing the sludge and enabling the upper filter cloth to coincide with the bottom filter cloth, wrapping the sludge between the double-layer filter cloth, feeding the double-layer filter cloth into a filter plate group to surround the filter plate group, performing filter pressing and water removal operation on the double-layer filter cloth between filter pressing plates in a mode of extruding the filter plate group, separating the double-layer filter cloth from a filter cloth outlet of the filter plate group, and enabling filter pressed mud cakes to fall off along with the redirection of the lower filter cloth and the separation of the double-layer filter cloth at a redirection roller below the filter cloth outlet.

The method comprises the following specific processes: the vertical double-layer filter cloth circulating press filtration system is utilized to uniformly spread solid sludge on the filter cloth I above the carrier roller, blanking is controlled intermittently, the filter cloth I is driven by the driving roller to rotate along with the sludge, the sludge is alternately spread on the filter cloth I, meanwhile, the filter cloth II rotates, the filter cloth II is close to the filter cloth I carrying the sludge at the position of the pre-pressing device, the thickness of the sludge between the double-layer filter cloth is regulated and controlled by adjusting the distance between the upper and lower squeezing rollers, the double-layer filter cloth after the pre-pressing device enters the filter plate group from the filter cloth inlet, the double-layer filter cloth coated with materials continuously enters the press filter plate along with the operation and continuous material distribution of the double-layer filter cloth, the driving roller stops moving until the double-layer filter cloth with the sludge rotates to the gap above the bottommost press filter plate in front of the discharge end, and the material distribution process is finished;

starting a hydraulic oil cylinder on the frame, supporting a lower pressure plate to drive a plurality of pressure filter plates to be gradually jacked upwards, gradually closing the pressure filter plates, jacking a filter plate group to an upper pressure plate along with the rising of the hydraulic oil cylinder, and gradually compacting the filter plate group, after keeping for 1-2 minutes, discharging the water after pressure filtration, descending the hydraulic oil cylinder, separating the superposed pressure filter plates one by one along with the descending of the oil cylinder, finally returning all the pressure filter plates to the original position, and finishing the pressure filtration process;

the driving system of the filter cloth I and the filter cloth II is started again to drive the double-layer filter cloth to operate, the filter cloth I and the filter cloth II at the filter cloth outlet are separated, the sludge which is subjected to filter pressing falls along with the redirection discharge of the bottom filter cloth I at the redirection roller at the lower filter cloth outlet, the sludge distribution is started at the sludge outlet when the driving system is started, the double-layer filter cloth stops operating after the sludge which is subjected to filter pressing is completely emptied, and meanwhile, the new round of distribution is completed.

This technical scheme can improve output through increasing the quantity of the filter-pressing board of predetermineeing.

The invention has the beneficial effects that:

the traditional continuous belt filter press is suitable for flowing mud, the filter pressing efficiency is low, the water content of mud cakes is high and reaches 80%, and higher treatment cost is brought to subsequent sludge treatment.

In addition, the conventional vertical filter presses are all single-layer filter cloth, the filter pressing plates are all provided with spaces for containing sludge slurry inside, a high-pressure slurry pump is needed to press the sludge into the material containing spaces in the filter plates, the filter pressing plates are complex to manufacture, and a plurality of auxiliary devices are needed; the filter pressing plate is easy to damage and inconvenient to maintain.

The sludge containing less moisture needs to be treated, for example, the sludge pressed by the belt filter press can be further subjected to filter pressing, so that the sludge moisture is lower, the volume is smaller, a large amount of funds are saved for a subsequent sludge treatment section, and the sludge treatment method has good market economic benefits; the invention adopts the vertical filter pressing and double-layer filter belt circulation process, does not need to use special material sealing space, does not need to adopt filter pressing plates with complex processes, and can carry out intermittent production; solid sludge is clamped in the double-layer filter cloth between the two filter pressing plates, the filter pressing plates are directly extruded by using a hydraulic oil cylinder, the filter pressing efficiency is higher, and the water content of the sludge is lower and can reach 60-45%.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a partial structural schematic view of a filter press plate according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a redirection roller of the filter pressing plate;

FIG. 4 is a schematic structural view of a conventional vertical filter press;

figure 5 is a schematic diagram of a continuous belt filter press.

FIG. 6 is a schematic structural view of a filter pressing plate guiding mechanism;

FIG. 7 is a schematic diagram of a side view structure of a filter pressing plate guiding mechanism

1-upper pressing plate, 2-lower pressing plate, 3-hydraulic cylinder, 4-filter pressing plate, 5-direction changing roller, 6-filter cloth I, 7-filter cloth II, 8-lower mud hole, 9-prepressing device, 10-driving roller I0, 11-upper squeezing roller, 12-lower squeezing roller, 13-carrier roller, 14-direction changing roller, 15-tensioning roller, 16-scraping plate, 17-cleaning device, 18-fixing plate, 19-drainage pipe, 20-water filtering groove, 21-strip mounting hole, 22-bearing seat, 23-top thread, 24-clamping table, 25-guiding groove and 26-step.

Detailed Description

The vertical double-layer filter cloth circulating filter pressing system comprises a frame, wherein the frame is provided with a double-layer filter cloth circulating mechanism and a filter plate group, an upper pressing plate 1, a lower pressing plate 2 and a hydraulic cylinder 3, the upper pressing plate 1, the lower pressing plate 2 and the hydraulic cylinder 3 are connected with the frame, the upper end of the filter plate group is connected with the upper pressing plate 1, the lower end of the filter plate group is connected with the lower pressing plate 2, the hydraulic cylinder 3 is connected with the upper pressing plate 1 or the lower pressing plate 2, the hydraulic cylinder 3 acts, and the upper pressing plate 1 and the lower pressing plate 2 are close to each other;

the filter plate group comprises a plurality of filter pressing plates 4, the filter pressing plates 4 are horizontally arranged between an upper pressing plate 1 and a lower pressing plate 2 and are parallel to the upper pressing plate, a direction changing roller 5 is arranged at one end of each filter pressing plate 4, the uppermost filter pressing plate 4 is provided with a lower pressing surface, the lowermost filter pressing plate 4 is provided with an upper pressing surface, the rest filter pressing plates 4 comprise upper pressing surfaces and lower pressing surfaces, a gap is arranged between the lower pressing surface of the upper filter pressing plate 4 and the upper pressing surface of the lower filter pressing plate 4, the gap is a filter cloth passing gap, and the filter cloth is extruded between the two plate surfaces by the involution of the lower pressing surfaces and the upper pressing surfaces; the filter-pressing board 4 replace traditional filter-pressing board, no longer set up diaphragm and slip casting pipeline and vallecular cavity, the upper end of filter-pressing board 4 is for pressing the face, the lower extreme is the face of pushing down, parallel to each other, last face of pressing be provided with water filtering tank 20, water filtering tank cross-section is rectangle or U-shaped, the face of pushing down is flat structure, filter-pressing board 4 go up the face of pressing and the face of pushing down be the pressure-bearing surface, water filtering tank 20 go out the water end collect the border and connect the drain pipe 19 and lead out.

The double-layer filter cloth circulating mechanism comprises filter cloth I6 and filter cloth II 7, wherein the filter cloth I6 and the filter cloth II 7 are independent annular filter belts and are provided with respective circulating paths, the circulating paths are provided with a driving roller and a tension roller 15, one end of a gap at the top of a filter plate group is a filter cloth inlet, one end of a gap at the bottom of the filter plate group is a filter cloth outlet, the filter cloth I6 and the filter cloth II 7 are overlapped together to form double-layer filter cloth in front of the filter cloth inlet, the double-layer filter cloth is arranged in the same way as the filter cloth belts of the traditional vertical filter press and is arranged in an S shape on the filter plate group, the double-layer filter cloth enters the gap at the top of the filter plate group, is redirected through a redirection roller at one end of a first filter press plate below the gap to enter a gap above a second filter press plate below the gap, is redirected through a redirection roller at the other end of the second filter press plate to enter a gap above a third filter press plate, and reciprocates in the same way, until the double-layer filter cloth comes out from the filter cloth outlet of the filter plate group, the double-layer filter cloth is separated.

Furthermore, the filter cloth I6 and the filter cloth II 7 are one of terylene filter cloth for a filter press, polypropylene filter cloth, plate-frame filter press nylon filter cloth or plate-frame filter press vinylon filter cloth, and have the characteristics of pressure resistance, flexibility and air permeability.

The filter cloth I6 and the filter cloth II 7 have the same width and are slightly narrower than the filter pressing plate 4.

The filter cloth I6 and the filter cloth II 7 are driven to rotate by the driving roller, and the expansion degree is adjusted by the expansion roller 15.

Furthermore, the driving roller comprises a driving roller I10 and a driving roller II which are respectively in driving connection with a filter cloth I6 and a filter cloth II 7, tensioning rollers 15 are respectively arranged on circulation paths of the filter cloth I6 and the filter cloth II 7 to adjust the tensioning degree, and a turnabout drum is further arranged for changing direction; the drive roller can also be replaced by a direction-changing roller 5 on the filter plate group.

The filter pressing plates are movably connected with each other and can be stacked together or unfolded to be parallel to each other.

The concrete connection mode between the pressure filter plates adopts the connection mode of the filter plate group of the traditional vertical pressure filter and a frame or a driving mechanism, is a known technology, a hydraulic cylinder acts, an upper pressure plate is close to a lower pressure plate, and the middle filter plate group is superposed and extruded, for example, the vertical pressure filter with the patent number of 200920222556X or the vertical pressure filter with the patent number of 2016106091889, two sides of the pressure filter plates are movably connected through chain plates, the uppermost pressure filter plate and the lowermost pressure filter plate are respectively fixedly connected with the upper pressure plate and the lower pressure plate, and the connection mode can refer to the structural style of an HVPF vertical full-automatic pressure filter produced by the same group.

Further, the frame of the present application is further provided with a guiding mechanism, as shown in fig. 6 and 7, the outer side surface of the filter pressing plate 4 is provided with a convex clamping table 24, three clamping tables are grouped on the same vertical surface in the movement lifting direction of the hydraulic cylinder 3, the length of the convex clamping table 24 is increased progressively, the clamping table 24 of the uppermost filter pressing plate 4 is the longest, correspondingly, the frame on the two sides of the filter pressing plate 4 is provided with a recessed guiding groove 25, the position of the recessed guiding groove 25 is matched and corresponding to the displacement path of the clamping table 24 of the filter pressing plate 4, the bottom end sides of the three guiding grooves 25 along the cylinder lifting direction form a step 26, and the transverse depth of the guiding groove 25 is increased progressively. When the filtering pressure of the device is finished and the hydraulic cylinder 3 falls back, the clamping table 24 on the filter plate just falls on the bottom of the inner guide groove 25 on the frame.

The filter cloth import place ahead frame be provided with mud mouth 8 down, mud mouth 8 sets up directly over filter cloth I6 route down, mud falls into on filter cloth I6 from mud mouth 8 down. Lower mud mouth 8 connect mud storage pipeline or mud storehouse, lower mud mouth 8 is provided with row mud device, for example can carry the auger to crowd mud into lower mud mouth 8 through the single cylinder. The mud discharging opening 8 is a square opening, and the width of the mud discharging opening is smaller than that of the filter cloth I6.

The lower mud hole 8 is horizontally arranged to the filter cloth I6 of the filter cloth inlet, and at least two carrier rollers 13 are arranged below the filter cloth I6 below the lower mud hole 8.

A pre-pressing device 9 is arranged on the machine frame in front of the filter cloth inlet and comprises an upper squeezing roller 11 and a lower squeezing roller 12 which are close to each other in parallel, and the upper squeezing roller 11 and the lower squeezing roller 12 are respectively in contact connection with the filter cloth II 7 and the filter cloth I6; the upper squeeze roller 11 can be used as a driving roller II of the filter cloth II 7.

The driving roller, the tensioning roller 15, the upper squeeze roller 11 and the lower squeeze roller 12 are all connected with the frame through a bearing seat 22.

A cleaning device 17 is arranged on a circulation path of the filter cloth I6 or the filter cloth II 7, the cleaning device 17 is a spray head connected with a water source, the cleaning device 17 continuously cleans the filter cloth when the double-layer filter cloth operates, and the cleaning system stops working when the filter cloth stops operating.

When the double-layer filter cloth operates, one end of the filter pressing plate 4 is provided with a redirection roller 5, the redirection roller 5 is provided with a filter cloth deviation correction device, the deviation correction device comprises a bearing seat 22 and a fixing plate 18 for fixing the bearing seat 22, a transverse strip mounting hole 21 is formed in the fixing plate 18, one end of the fixing plate 18 is fixedly connected with the end part of the filter pressing plate 4, the other end of the fixing plate is connected with the bearing seat 22 through the strip mounting hole 21, and the jacking screw 23 jacks the bearing seat 22 to realize deviation correction of the double-layer filter cloth.

Furthermore, a mud scraping device is arranged at a bend roller at the end part of the filter pressing plate at the outlet position of the bottommost filter cloth, so that the sludge adhered to the filter cloth I6 is removed; furthermore, a mud scraping device is arranged on the filter cloth circulation path to realize the removal of the sludge on the surface of the filter cloth II 7; the mud scraping device is a scraper 16 close to the surface of the filter cloth, and the width of the scraper 16 is larger than that of the filter cloth.

A filter pressing method of a circulating filter pressing system utilizing vertical double-layer filter cloth comprises the steps of paving sludge on bottom filter cloth, driving the bottom filter cloth and upper filter cloth to operate by a driving mechanism, covering the upper filter cloth above the bottom filter cloth containing the sludge and enabling the upper filter cloth to coincide with the bottom filter cloth, wrapping the sludge between the double-layer filter cloth, feeding the double-layer filter cloth into a filter plate group to surround the filter plate group, performing filter pressing operation on the double-layer filter cloth between filter pressing plates in a mode of extruding the filter plate group, separating the double-layer filter cloth from a filter cloth outlet of the filter plate group, and enabling filter-pressed mud cakes to fall off along with redirection of the lower filter cloth and separation of the double-layer filter cloth at a redirection roller below the filter cloth outlet.

The specific process comprises the following steps: utilizing the vertical double-layer filter cloth circulating filter pressing system, uniformly spreading solid sludge on the filter cloth I6 above the carrier roller 13, driving the filter cloth I6 and the filter cloth II 7 to rotate along with the driving roller, pressing the filter cloth II 7 close to the filter cloth I6 carrying the sludge at the position of the pre-pressing device 9, adjusting the distance between the upper squeezing roller 12 and the lower squeezing roller 12 to regulate and control the thickness of the sludge between the double-layer filter cloths, enabling the double-layer filter cloth passing through the pre-pressing device 9 to enter the filter plate group from the filter cloth inlet, continuously distributing materials along with the operation of the double-layer filter cloth, enabling the double-layer filter cloth coated with the materials to continuously enter the filter pressing plates until the double-layer filter cloth with the sludge runs to the gap above the bottommost filter pressing plates in front of the discharge end, stopping the driving roller and finishing the distribution process;

starting a pressing oil cylinder on the rack, supporting a lower pressing plate to drive a plurality of pressing plates to be gradually lifted upwards, closing the pressing plates gradually, lifting the pressing plates to an upper pressing plate together with the lifting of the pressing oil cylinder, and pressing the pressing plates gradually, descending the pressing oil cylinder after keeping for 1-2 minutes, separating the pressing plates which are superposed together one by one along with the descending of the oil cylinder, and finally returning all the pressing plates to the original position;

and when the driving system is started, the sludge opening also starts to distribute the sludge, and when the sludge which is subjected to filter pressing is completely emptied, the double-layer filter cloth stops running, and simultaneously a new round of distribution is completed.

This technical scheme can improve output through increasing the quantity of the filter-pressing board of predetermineeing.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should be construed as the protection scope of the present invention without inventive effort.