CN107376463B - Belt filter press capable of adjusting tension in segmented mode - Google Patents
Belt filter press capable of adjusting tension in segmented mode Download PDFInfo
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- CN107376463B CN107376463B CN201710657645.6A CN201710657645A CN107376463B CN 107376463 B CN107376463 B CN 107376463B CN 201710657645 A CN201710657645 A CN 201710657645A CN 107376463 B CN107376463 B CN 107376463B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
- B01D33/042—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering whereby the filtration and squeezing-out take place between at least two filtering bands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/80—Accessories
- B01D33/82—Means for pressure distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/20—Pressure-related systems for filters
- B01D2201/202—Systems for applying pressure to filters
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Abstract
The invention discloses a belt filter press capable of adjusting tension in a segmented manner, which comprises a filter pressing belt, a spreading and distributing roller, a feeding thickness adjusting roller, a net belt tension filter pressing roller, a groove filter pressing roller, a negative pressure damping box, a pressurizing belt damping roller, a net belt damping roller, a groove damping filter pressing roller, a driving roller, a net belt discharging roller, an upper discharging scraper, a lower discharging scraper, a net guiding roller, a net belt flushing pipe, a net belt deviation rectifying roller, a net belt tensioning roller, a pressurizing belt deviation rectifying roller, a pressurizing belt, a filtrate receiving disc, a cleaning liquid receiving disc, a filter cake outlet, a net folding damping roller, a ox horn segmentation pressing groove roller, a damping counter roller, a segmentation damping pressing belt, a folding belt deviation rectifying roller and a folding belt tensioning roller. The invention can flexibly control the squeezing pressure through the damping component, and simultaneously, the sectional tension adjustment ensures that the filter belt is tensioned only in the tension dewatering area to form effective dewatering power, thereby avoiding the defect that the yield creep of the filter belt is gradually elongated.
Description
[ field of technology ]
The invention relates to a solid-liquid separation device, in particular to the technical field of belt filter presses capable of adjusting tension in a segmented mode.
[ background Art ]
The belt filter press is a solid-liquid separation device widely used in the fields of sludge dewatering, slag dewatering, pulp forming and the like. The basic process is that two filter screens clamp the material to make serpentine motion along the dewatering roller, and liquid in the material is extruded out by means of the tension of the filter screens. In the running process of the annular net of the belt filter press, the tension born by each part of the net belt is consistent, the pressing pressure of a specific filter press roller cannot be flexibly regulated, and the problems of side leakage and low solid content of filter cakes are commonly caused, for example, the solid content of municipal sludge is only about 20%. As an improvement, patent application No. 201510343569.2 "drum type sludge press dryer" describes a drum type sludge press apparatus which uses plural sets of counter pressures to enhance the pressing force on the material, and compensates for the problem of insufficient tension of the dewatering mesh belt itself, which is quite effective for materials which are easily dewatered, such as distillers grains, papermaking waste residues, and the like. The main problems with this device are: for materials with poor water filtering performance, such as municipal sludge, when the squeeze rolls are pressed, the filter media such as the mesh belt are difficult to bear excessive force to generate a bulging phenomenon, so that the squeezing pressure can only be reduced to run, and the squeezing effect is restricted. To solve this problem, patent application No. 2015116975. X "single-filter belt press" describes a single-filter belt press, the core of which is to add a metal mesh belt to provide additional tension for pressing and to solve the drawbacks of belt folding, bulging, etc. However, the solution described in this patent still has the following problems:
1. the squeezing force exerted by the material mainly comes from the tension of the metal mesh belt, and the same is exerted by the material in the whole pressing area because the tension of each point of the metal mesh belt is the same, and the squeezing force exerted by the material at the inlet and the outlet is the same, so that side leakage or feeding difficulty occurs when the material which is difficult to dehydrate, such as municipal sludge, is operated. If the technology described in the patent is used, the solution can only adopt a plurality of squeezing combinations, and the steps are gradually boosted, so that the problems of huge equipment, high manufacturing cost, high power consumption and the like are caused.
2. The pressing force comes from the tension of the metal mesh belt, so that it is impossible to obtain a pressing force exceeding that which can be provided by the tension of the metal belt. For example, if the wire tension is 200N/MM, the dewatering roll diameter is 500MM, and the press pressure is 0.8MPA. For reference, the squeezing pressure of the box type membrane filter press is generally 1.6MPA, so that the insufficient squeezing pressure of the equipment is a obvious problem.
[ invention ]
The invention aims to solve the problems in the prior art, and provides a belt filter press capable of adjusting tension in a sectionalized manner, which can flexibly adjust the tension of a specific part of a filter belt according to requirements so as to adapt to the dehydration process requirement, and the filter belt is tensioned only in a tension dehydration area so as to form effective dehydration power, once the filter belt leaves the dehydration area, the tension automatically drops immediately, thereby being beneficial to recovering and maintaining the original shape of the filter belt, and avoiding the defect that the filter belt keeps high tension in the whole machine in the traditional design, so that the yield creep of the filter belt is gradually prolonged.
In order to achieve the aim, the invention provides a belt filter press capable of adjusting tension in a segmented way, which comprises a material feed inlet, a filter pressing net belt, a spreading distributing roller, a feed thickness adjusting roller, a net belt tension filter pressing roller, a groove filter pressing roller, a pressurizing belt damping roller, a net belt damping roller, a driving roller, a net belt discharging roller, an upper discharging scraper, a lower discharging scraper, a net guiding roller, a net belt flushing pipe, a net belt deviation rectifying roller, a net belt tensioning roller, a pressurizing belt deviation rectifying roller, a pressurizing belt, a filtrate receiving tray, a cleaning liquid receiving tray and a filter cake outlet, wherein the filter pressing net belt and the pressurizing belt are two annular belts, the filter pressing net belt surrounds the net belt tensioning roller, the net belt deviation rectifying roller, the net guiding roller, the net belt discharging roller, one or more groove filter pressing rollers, one or more net belt tension filter pressing rollers, the net belt damping roller and the pressurizing belt damping roller are connected end to form a closed annular belt, the said net belt tensioning roller, net belt deviation correcting roller and net guiding roller control the tension and deviation adjustment of the press filter net belt, the said press belt surrounds one or more net belt tension press filter roller, one or more grooved press filter roller, press belt damping roller, net belt damping roller, driving roller, press belt deviation correcting roller and press belt tensioning roller to form a closed ring, the said press belt deviation correcting roller and press belt tensioning roller control the tension and deviation adjustment of the press belt, the said press belt and press filter belt are tightly adhered together and form a press area together between the net belt tension press filter roller, grooved press filter roller, press belt damping roller and net belt damping roller, the material to be dehydrated is clamped between the press filter belt and press belt, the press belt is impermeable to liquid, the press belt provides sufficient press tension and friction force for the press filter belt, and the press belt can keep its size stable under the condition of being stressed, the cleaning liquid receiving disc is arranged below the mesh belt flushing pipe, the filter cake outlet is positioned between the driving roller and the mesh belt discharging roller, and the upper discharging scraper and the lower discharging scraper are respectively arranged at the upper end and the lower end of the filter cake outlet.
Preferably, the filter pressing net belt and the pressurizing belt also pass through a groove damping filter pressing roller, a guide roller, a net folding damping roller, a ox horn segment pressing groove roller, a damping counter-pressing roller, a liquid-permeable segment damping pressurizing belt, a liquid-impermeable segment damping pressurizing belt, a belt folding deviation correcting roller and a belt folding tensioning roller.
Preferably, at least one end of the pressurizing belt damping roller, the net folding damping roller and the damping opposite pressing roller is provided with a braking device, the braking device can adjust the local tension of the filtering net pressing belt and the pressurizing belt, so as to adjust the pressing pressure, the sectional damping pressurizing belt penetrating through the liquid is an annular belt with high tensile strength and small deformation, the sectional damping pressurizing belt penetrating through the liquid is tensioned by the local tension formed by the superposition of the driving force of the driving roller and the resistance of the damping roller, and the tensioning force provides additional dynamic dehydration power except static tension and is transmitted to the filtering net pressing belt and the materials clamped by the filtering net pressing belt to be continuously pressed, so that the solid-liquid separation is realized.
Preferably, spiral blades are arranged on the roll shaft of the spreading cloth roll, plate-shaped blades are arranged on the roll shaft of the feeding thickness adjusting roll, and the surfaces of the pressurizing belt damping roll, the net stacking damping roll and the damping counter-pressure roll are wrapped with high friction layers.
Preferably, a negative pressure damping box is further arranged below the filter pressing mesh belt between the grooved filter pressing roller and the pressurizing belt damping roller, the surface of the negative pressure damping box, which is in contact with the filter pressing mesh belt, is a wear-resistant panel provided with grooves, and the negative pressure damping box can adjust the suction vacuum degree to adjust the tension of the filter pressing mesh belt.
Preferably, the surface of the grooved press roll has annular grooves.
Preferably, the tension of the filter-pressing net belt is 5-15 newtons/millimeter.
Preferably, the tension of the pressing belt is 15-105 newtons/millimeter, and the longitudinal and transverse dimension deformation of the pressing belt is not more than 3% under the condition of 100 newtons/millimeter tension.
The invention has the beneficial effects that: according to the invention, the tension of a specific part of the mesh belt is flexibly adjusted through the damping part to adapt to different dehydration process requirements, the filter mesh belt is tensioned only in a tension dehydration area through segmented tension adjustment to form effective dehydration power, once the filter mesh belt leaves the dehydration area, the tension automatically drops immediately, the mesh belt is facilitated to recover and maintain the original shape, and the defect that the filter mesh belt is gradually elongated due to yield creep of the filter mesh belt because the filter mesh belt maintains high tension in the whole machine in the traditional design is avoided. The gradual pressurizing and dewatering area can be naturally formed in the squeezing channel through the ox horn gradual pressurizing and dewatering area, the requirement of the dewatering process is met, the high-water-content material is dewatered at low pressure, the low-water-content material is dewatered at high pressure, the squeezing pressure can be controlled more flexibly through the arrangement of the damping pair pressing rollers, the ox horn gradual pressurizing and dewatering area is divided into a plurality of small ox horn gradual pressurizing and dewatering areas, the pressure of each area is regulated according to the requirement, and the more accurate sectional tension regulation is realized.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
[ description of the drawings ]
FIG. 1 is a schematic view of a belt filter press with segmented tension adjustment according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a belt filter press embodiment II with staged tension adjustment according to the present invention;
FIG. 3 is a schematic view of a third embodiment of a belt filter press with segmented tension adjustment according to the present invention.
In the figure: 1-material feed inlet, 2-filter press net belt, 3-spreading cloth roller, 4-feed thickness regulating roller, 5-net belt tension filter press roller, 51-groove filter press roller, 6-negative pressure damping box, 7-pressurizing belt damping roller, 71-net belt damping roller, 722-groove damping filter press roller, 8-driving roller, 9-net belt discharging roller, 10-upper discharging scraper, 11-lower discharging scraper, 12-net guiding roller, 121-guiding roller, 13-net belt flushing pipe, 14-net belt deviation rectifying roller, 15-net belt tensioning roller, 16-pressurizing belt tensioning roller, 17-pressurizing belt deviation rectifying roller, 18-pressurizing belt, 19-filtrate receiving tray, 20-cleaning liquid receiving tray, 21-filter cake outlet, 22-net folding damping roller, 23-ox horn section pressing roller, 231-ox horn section pressing groove roller, 24-damping pair pressing roller, 25-pair pressing roller, 26-liquid permeation section damping pressurizing belt 261-liquid impermeable section damping pressurizing belt, 271-folding belt tensioning roller, 281-folding belt deviation rectifying roller.
[ detailed description ] of the invention
Referring to fig. 1, 2 and 3, the belt filter press capable of adjusting tension stepwise according to the present invention comprises a material feed inlet 1 to be processed, a filter-pressing net belt 2, a spreading cloth roller 3, a feed thickness adjusting roller 4, a net belt tension filter-pressing roller 5, a groove filter-pressing roller 51, a negative pressure damping box 6, a pressurizing belt damping roller 7, a net belt damping roller 71, a groove damping filter-pressing roller 722, a driving roller 8, a net belt discharging roller 9, an upper discharging scraper 10, a lower discharging scraper 11, a net guiding roller 12, a guide roller 121, a net belt flushing pipe 13, a net belt rectifying roller 14, a net belt tensioning roller 15, a pressurizing belt tensioning roller 16, a pressurizing belt rectifying roller 17, a pressurizing belt 18, a filtrate receiving tray 19, a cleaning liquid receiving tray 20, a filter cake outlet 21, a net folding damping roller 22, a ox horn section pressing roller 23, a ox horn section pressing groove roller 231, a damping counter roller 24, a counter roller 25, a section damping pressurizing belt 26 for liquid permeation, a section damping pressurizing belt 261 for liquid permeation, a belt rectifying roller 271 and a belt tensioning roller 281, the two ends of each dewatering roll, the filtrate receiving disc 19 and the cleaning liquid receiving disc 20 are fixed on a frame, the filter-pressing net belt 2 and the pressurizing belt 18 are two annular belts, the filter-pressing net belt 2 surrounds the net belt tensioning roll 15, the net belt deviation rectifying roll 14, the net guiding roll 12, the net belt discharging roll 9, the one or more grooved filter-pressing rolls 51, the one or more net belt tensioning filter-pressing rolls 5, the net belt damping roll 71 and the pressurizing belt damping roll 7 to be connected end to form a closed endless belt, the net belt tensioning roll 15, the net belt deviation rectifying roll 14 and the net guiding roll 12 are used for tensioning and regulating the filter-pressing net belt 2, and the pressurizing belt 18 surrounds the one or more net belt tensioning filter-pressing rolls 5, the one or more grooved rolls 51, the pressurizing belt damping roll 7, the net belt damping roll 71, the driving roller 8, the correcting roller 17 and the tensioning roller 16 are connected end to form a closed ring, the correcting roller 17 and the tensioning roller 16 are used for tensioning and adjusting the pressure belt 18, the pressure belt 18 is tightly attached to the filter pressing net belt 2 and forms a squeezing area together among the net tension filter pressing roller 5, the grooved filter pressing roller 51, the damping roller 7 and the net damping roller 71, the material to be dehydrated is clamped between the filter pressing net belt 2 and the pressure belt 18, the pressure belt 18 is impermeable to liquid, the pressure belt 18 is arranged above the filter pressing net belt 2, the pressure belt 18 provides enough squeezing tension and friction force for the filter pressing net belt 2, the pressure belt 18 can keep stable self dimension under the condition of stress, the traditional belt filter press is that two filter belts clamp filter cakes move forward, but when the filter pressing net tightly attached to the roller surface is actually arranged, the filter screen dehydration efficiency of the filter cake on the roller surface is very low, and the filter cake removed on the upper side of the dewatering roller tends not to be led out in time if the filter cake is arranged horizontally, so that the efficiency is greatly reduced. In order to solve the problem, the invention adopts a one-way filter pressing technology, and the process is as follows: the filter cake is clamped by two annular belts and goes around a series of dewatering rollers, wherein one annular belt is a filter-pressing net belt 2 which is used for intercepting solids and allowing liquid to pass through, and the filter-pressing net belt 2 can be a filter screen, a filter felt or a filter cloth which are made of nonmetal or metal; the other endless belt is a pressure belt 18 impermeable to liquid, which is used to provide sufficient squeezing tension and friction and to maintain its dimensional stability under stress, and the material of the pressure belt 18 may be nylon sheet base belt, metal belt, canvas belt, composite rubber belt, etc.
The spiral blades are arranged on the roll shaft of the spreading cloth roll 3, the plate-shaped blades are arranged on the roll shaft of the feeding thickness adjusting roll 4, the negative pressure damping box 6 is arranged below the filter pressing net belt 2 between the grooved filter pressing roll 51 and the pressurizing belt damping roll 7, the surface of the negative pressure damping box 6, which is in contact with the filter pressing net belt 2, is a wear-resistant panel with grooves, the negative pressure damping box 6 adjusts the net belt tension of the filter pressing net belt 2 and the pressurizing belt 18 of the dewatering roll by adjusting the suction vacuum degree, so that the mud surface pressure is adjusted, the surface of the negative pressure damping box 6, which is in contact with the net belt, adopts wear-resistant materials, such as ceramic panels, and the grooves or holes are formed in the panels. The negative pressure damping box 6 has the advantages of simplicity, easiness in implementation, seam insertion and capability of removing moisture on the surface of the mesh belt.
The mesh belt flushing pipe 13 can keep the smoothness and cleanliness of the filter media, the cleaning liquid receiving disc 20 is arranged below the mesh belt flushing pipe 13, the surfaces of the pressurizing belt damping roller 7, the mesh folding damping roller 22 and the damping counter-pressure roller 24 are wrapped with high friction layers, at least one of two ends of the pressurizing belt damping roller 7, the mesh folding damping roller 22 and the damping counter-pressure roller 24 is provided with a brake device, and the brake device can be realized in various manners, such as a mature commercial product magnetic powder brake, a pneumatic clamping type brake and the like, preferably a magnetic powder brake is adopted, and the brake moment can be regulated more accurately and flexibly. The braking device can adjust the local tension of the filter screen pressing belt 2 and the pressure belt 18, so as to adjust the squeezing pressure, the belt is tensioned by the local tension formed by the superposition of the driving force of the driving roller 8 and the resistance of the bypass damping roller, and the tensioning force provides dehydration power to realize the solid-liquid separation of squeezing. For the press zone in which the two rolls are pressed against each other, at least one of the two ends of at least one of the two rolls is provided with a braking device by means of which the local tension of the wire or the backing belt is adjusted, so that the press pressure is adjusted. The net belt is tensioned by the local tension formed by the superposition of the driving force of the driving roller 8 and the resistance of the bypass damping roller, and the tension provides dehydration power to realize the solid-liquid separation by pressing. The filter cake outlet is positioned between the driving roller 8 and the net belt discharging roller 9, and the upper discharging scraper 10 and the lower discharging scraper 11 are respectively arranged at the upper end and the lower end of the filter cake outlet 21.
The sectional damping pressurizing belt 26 for liquid permeation is an annular belt with large tensile strength and small deformation, the sectional damping pressurizing belt 26 for liquid permeation is tensioned by local tension formed by superposition of the driving force of the driving roller 8 and the resistance of the damping roller, and the tension provides additional dynamic dehydration power except static tension and is transmitted to the press screen belt 2 and materials clamped by the press screen belt for continuous pressing, so that solid-liquid separation is realized. The parameters and specific materials of the segmented damped compression band 26 for fluid permeation: the tension is 50-500N/mm, and the optimal range is 100-300N/mm. The sectional damping compression belt 26 is deformed in the longitudinal and transverse directions by no more than 2% under a tension of 500 newtons/millimeter. The segmented damping pressure belt 26 for fluid penetration should be constructed with sufficient wire diameters that are not parallel to the direction of travel to help increase the friction of the pressurized damping stack with damping elements such as the stack damping roll 22 and the damping counter roll surface 24 to prevent slippage. The segmented damping pressure belt 26 for liquid permeation can be a metal or nonmetal high-strength annular net, such as a metal net, a herringbone steel wire net can be adopted, enough tension can be provided, the diameter of a transverse bar is 1-2 mm, the diameter of the transverse bar is optimized to be 1.4 mm, the diameter of a wire winding is 1-1.5 mm, the diameter of the wire winding is optimized to be 1.2 mm, and the material is stainless steel. For example, the nonmetallic net can be a high-strength herringbone woven net or a spiral net made of resin, polypropylene or nylon, and the wire diameter is 0.8-2.0 mm.
As means for enhancing the dewatering effect, a ox horn shaped progressive pressurizing dewatering zone is adopted, and the dewatering zone is provided with at least one counter-pressure roller and one damping roller with independently adjustable pressure, wherein the damping roller can be a counter-pressure damping roller or a bypass damping roller. The working principle of the ox horn dehydration channel is as follows: the material falls into a wedge-shaped area formed by a damping pressurizing belt and a filtering belt which are impermeable to liquid through a distributing device, and enters a squeezing area under the driving of a squeezing roller, and the space of the squeezing area is gradually reduced along the arc shape of the surface of a dewatering roller, so that a dewatering squeezing channel similar to a ox horn shape is formed. At the end of the press zone there is provided a press roll which is capable of providing a line pressure of 50 to 2000N/MM, for example a twin roll nip width of 200 MM, the pressure at the end of the ox horn being 0.25 to 10.0MPA. While the pressure of conventional twin-roll presses is effective only at the contact surface of two rolls, the biggest disadvantage of twin-roll presses is the narrow contact surface, for example, the effective length of two roll press zones having a diameter of 800 mm is only about 300 mm. Different from the common twin-roll squeezing, the sectional damping pressurizing belt is adopted, the pressurizing pressure is transmitted to all materials wrapped by the pressurizing belt through the sectional damping pressurizing belt, if the wrap angle is 180 degrees, the diameter of the dewatering roll is 800 millimeters, the effective length of the squeezing area is 1256 millimeters, which is more than 4 times of that of the traditional twin-roll squeezing design. In the pressing area, the pressure of the pressing point is higher when the pressing area is closer to the twin-roll, the water content of the material is lower, and correspondingly, the relative movement resistance in the material is higher, the pressure in the material is attenuated due to the action of the internal movement resistance of the material, the pressure of the material which is closer to the twin-roll is higher, the pressure of the material which is farther from the twin-roll is lower, so that a gradual pressurizing mechanism is naturally formed in the pressing channel, the material with high water content is dehydrated under low pressure, and the material with low water content is dehydrated under high pressure, which is completely consistent with the dehydration process requirement, because the drier material can be dehydrated under higher pressure, otherwise, the material with higher water content can be dehydrated under lower pressure. In order to flexibly control the squeezing pressure, a plurality of damping paired compression rollers can be arranged, the ox horn-shaped progressive pressurizing and dewatering area is divided into a plurality of small ox horn-shaped progressive pressurizing and dewatering areas, and the pressure of each area is adjusted according to the requirement.
The filter-pressing net belt 2 mainly plays a role of a filter medium and provides certain filter-pressing tension, the tension of the filter-pressing net belt 2 is generally 5-15 newtons/millimeter, the pore diameter is selected according to the filter characteristics of the treated materials, the particle size, the particle distribution and other factors, the materials are polyester terylene, nylon, polypropylene and the like, and the weaving form can be herringbone, annular and the like. And (3) optimizing design: for municipal sludge, a herringbone woven polyester filter screen is selected, and the tension is 8N/mm.
The purpose of the press belt 18 is mainly to provide press filtration tension and friction, and when a mesh belt is used as the press belt 18, an auxiliary press filtration function is also provided, but the press filtration function is secondary, and tension and dimensional stability problems are considered first. In general, the tension strength of the press belt 18 is required to be much higher than that of the press belt 2. The pressurizing belt 18 applies pressure to the filter cake through tension, the filtrate is extruded and separated from the holes of the filter pressing mesh belt 2 and is led out from the grooves on the surface of the filter pressing grooved roll 51, the pressurizing belt 18 can be made of metal or nonmetal materials, the materials can be nylon sheet base band, metal band, canvas belt, composite rubber band, compact polyester net, polypropylene net, nylon net and the like, the tension range of the pressurizing belt 18 is 15-100N/mm, and the longitudinal and transverse dimension deformation of the pressurizing belt is not more than 3% under the tension condition of 100N/mm. The optimization scheme is as follows: a 0.5 mm 304 stainless steel belt was used.
Annular grooves are formed in the roller surface of the groove filter pressing roller 51, filtrate is led out along grooves of the grooves, the width of groove flanges is 2-10 mm, the width of the grooves is 3 mm, the width of the grooves is 2-10 mm, the depth of the grooves is 3 mm, the depth of the grooves is 2-15 mm, and the width of the grooves is 5 mm. The upper discharging scraper 10 and the lower discharging scraper 11 are respectively arranged at the upper end and the lower end of the filter cake outlet 21, the upper discharging scraper 10 and the lower discharging scraper 11 can scrape the filter cake from a filter screen or a pressurizing belt, and the material can be bakelite, a high polymer polyester sheet or metal, and is optimized to be a metal bracket embedded bakelite scraping blade.
Embodiment one:
referring to fig. 1, in the working process of the belt filter press capable of adjusting tension in a sectioning manner, materials to be processed enter the filter press from a material feed inlet 1, the materials sequentially pass through a spreading cloth roller 3 and a feeding thickness adjusting roller 4, spiral blades are arranged on a roller shaft of the spreading cloth roller 3, the spreading cloth roller 3 can disperse the materials to two sides, plate-shaped blades are arranged on the roller shaft of the feeding thickness adjusting roller 4, the feeding thickness adjusting roller 4 scrapes the materials and prevents excessive materials from entering the filter press, the materials to be dehydrated are clamped between a filter press mesh belt 2 and a pressurizing belt 18, the pressurizing belt 18 is impermeable to liquid, the pressurizing belt 18 is arranged above the filter press mesh belt 2, the pressurizing belt 18 provides enough squeezing tension and friction force for the filter press mesh belt 2, the pressurizing belt 18 can keep stable in size under the condition of being stressed, the materials to be dehydrated are clamped by two annular belts and move around a series of dehydrating rollers, in the moving process, the pressurizing belt damping roller 7 and the mesh belt damping roller 71 can adjust the partial tension of the filter press mesh belt 2 and the pressurizing belt 18 through a brake device, thereby adjusting the partial tension of the squeezing mesh belt 8, and the partial tension of the pressurizing belt is overlapped by the driving roller, and the partial tension force is formed by the tension force of the driving roller, and the tension force is realized. The filter press belt 2 retains solids, the pressurizing belt 18 applies pressure to the material to be dehydrated through tension, the filtrate is extruded and separated from the holes of the filter press belt 2 and is led out from the grooves on the surface of the filter press grooved roll 51, and as only one filter belt is used in the annular belt for clamping the filter cake, the filtrate always moves only towards the direction of the filter belt, and finally the filter press is extruded from the filter cake outlet 21.
Embodiment two:
referring to fig. 2, in the working process of the belt filter press capable of adjusting tension in a sectionalized manner, for a ox horn shaped progressive pressurizing and dewatering area, when the self tensile strength and the elongation of the dewatering mesh belt cannot meet the high pressure dewatering requirement, an annular belt with high tensile strength and small deformation can be wrapped outside the press area filter screen provided with the opposite damping roller along the dewatering roller to serve as a sectionalized damping and pressurizing belt 26 for liquid permeation. Unlike the existing tension belt such as the single-filtering belt filter press of the patent application No. 2015116975. X, the sectional damping pressurizing belt 26 for liquid permeation can flexibly regulate the tension in a sectional manner according to the requirement, so that the dewatering power allocation of the materials at the feeding and discharging positions is more reasonable, and the problem that the water content is increased due to the fact that the conventional technology is difficult to feed because the tension cannot be regulated in a sectional manner, or the problem that the water content is increased because the tension is reduced because the tension is increased because the dewatering is enhanced is avoided, or the tension is reduced because the feeding is carried out. The principle of operation of the sectional damped compression band 26 for liquid permeation is: the sectional damping pressurizing belt 26 for liquid permeation is tensioned by the partial tension formed by the superposition of the driving force of the driving roller 8 and the resistance of the damping roller to the damping roller or the winding damping roller, and the tension provides additional dynamic dewatering power besides static tension and is transmitted to the press screen belt 2 and the materials clamped by the press screen belt to continuously press, so that the solid-liquid separation is realized. Because the tension can be adjusted in sections, different requirements of the feeding section and the discharging section on the tension can be met in one continuous pressure area, and the difficult problem which is difficult to solve in the prior art is overcome. The sectional damping pressurizing belt 26 for liquid permeation is required to have high tensile strength and low deformation, so that the high pressure formed after the material is extruded can be maintained, and the pressure release and the pressure reduction caused by the bulge deformation are avoided.
Embodiment III:
referring to fig. 3, in the working process of the belt filter press capable of adjusting tension in a sectional manner, when materials with stronger corrosiveness or larger abrasion are treated, a sectional damping pressurizing belt 261 impermeable to liquid can be overlapped outside the filter belt. The segmented damping pressure belt 261, which is impermeable to the liquid, is capable of withstanding greater braking forces than the press belt, thereby providing additional press tension. Filtrate flowing out of the belt is led out of grooves on the surface of the ox horn segment press grooved roll 231; since it is impermeable to liquid, the running process is kept dry all the time, which is advantageous in preventing sliding, and an anti-slip agent may be sprayed on the surface of the sectional damping pressure belt 261, which is impermeable to liquid, in contact with the damping member to increase friction. The sectional damping pressurizing belt 261 which is impermeable to liquid can be made of metal or nonmetal materials, the materials can be nylon sheet base band, metal belt, canvas belt, composite rubber belt and the like, the thickness is 0.2-5 mm, and the optimal scheme is 0.5 mm 304 stainless steel plate. The tension is 50-500N/mm, and the optimal range is 100-300N/mm. The sectional damping press belt 261, which is impermeable to the liquid, is deformed by not more than 2% in the longitudinal and transverse dimensions under a tension of 500N/mm.
The above embodiments are illustrative of the present invention, and not limiting, and any simple modifications of the present invention fall within the scope of the present invention.
Claims (7)
1. A belt filter press capable of adjusting tension in a segmented manner, which is characterized in that: the device comprises a material feed inlet (1) to be treated, a filter-pressing net belt (2), a spreading material distribution roller (3), a feed thickness regulating roller (4), a net belt tension filter-pressing roller (5), a groove filter-pressing roller (51), a pressurizing belt damping roller (7), a net belt damping roller (71), a driving roller (8), a net belt discharging roller (9), an upper discharging scraper (10), a lower discharging scraper (11), a net guiding roller (12), a net belt flushing pipe (13), a net belt deviation correcting roller (14), a net belt tensioning roller (15), a pressurizing belt tensioning roller (16), a pressurizing belt deviation correcting roller (17), a pressurizing belt (18), a filtrate receiving disc (19), a cleaning liquid receiving disc (20) and a filter cake outlet (21), wherein the filter-pressing net belt (2) and the pressurizing belt (18) are two annular belts, the filter-pressing net belt (2) surrounds the net belt tensioning roller (15), the net belt deviation correcting roller (14), the net belt guiding roller (12), the net belt discharging roller (9), one or more groove filter-pressing rollers (51), one or more net belt filter-pressing tension rollers (5), the net belt tail roller (71) and the pressurizing belt damping roller (7) are connected into a net belt deviation correcting disc (14) and a closed net belt (14), the pressurizing belt (18) is connected end to form a closed loop around one or more net belt tension filter-pressing rollers (5), one or more groove filter-pressing rollers (51), a pressurizing belt damping roller (7), a net belt damping roller (71), a driving roller (8), a pressurizing belt deviation correcting roller (17) and a pressurizing belt tensioning roller (16), the pressurizing belt deviation correcting roller (17) and the pressurizing belt tensioning roller (16) control the tensioning and deviation adjusting of the pressurizing belt (18), the pressurizing belt (18) and the filter-pressing net belt (2) are tightly attached together and jointly form a squeezing area between the net belt tension filter-pressing rollers (5), the groove filter-pressing rollers (51), the pressurizing belt damping roller (7) and the net belt damping roller (71), the material to be dehydrated is clamped between a filter pressing net belt (2) and a pressurizing belt (18), the pressurizing belt (18) is impermeable to liquid, the pressurizing belt (18) provides enough squeezing tension and friction force for the filter pressing net belt (2), the pressurizing belt (18) can keep stable size under the condition of stress, a cleaning liquid receiving disc (20) is arranged below a net belt flushing pipe (13), a filter cake outlet (21) is arranged between a driving roller (8) and a net belt discharging roller (9), an upper discharging scraper (10) and a lower discharging scraper (11) are respectively arranged at the upper end and the lower end of the filter cake outlet (21), the filter pressing net belt (2) and the pressurizing belt (18) also pass through a groove damping filter pressing roller (722), a guide roller (121), a net folding damping roller (22), a ox horn segment pressing roller (23), a ox horn segment pressing groove roller (231), a damping counter-pressing roller (24), a counter-pressing roller (25), a liquid-permeable segment damping pressurizing belt (26), a liquid-impermeable segment damping pressurizing belt (261), a net folding deviation correcting roller (271) and a net folding tensioning roller (281), a filter cake is clamped by two annular belts and goes around a series of dewatering rollers, wherein one annular belt is the filter pressing net belt (2) and is used for intercepting solids and allowing liquid to pass through, and as only one filter belt is used in the annular belt for clamping the filter cake, the filtrate always moves only in the direction of the filter belt until flowing out; the other endless belt is a liquid impermeable pressure belt (18) which functions to provide sufficient press tension, friction and to maintain its dimensional stability under applied force.
2. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the pressurizing belt damping roller (7), the net stacking damping roller (22) and the damping opposite pressing roller (24) are provided with a braking device at least at one end, the braking device can adjust the partial tension of the filtering screen pressing belt (2) and the pressurizing belt (18) so as to adjust the pressing pressure, the sectional damping pressurizing belt (26) penetrating liquid is an annular belt with high tensile strength and small deformation, the sectional damping pressurizing belt (26) penetrating liquid is tensioned by the partial tension formed by the superposition of the driving force of the driving roller (8) and the resistance of the damping roller, the tensioning force provides additional dynamic dehydration power except static tension, and the additional dynamic dehydration power is transmitted to the filtering screen pressing belt (2) and materials clamped by the filtering screen pressing belt to continuously press, so that the solid-liquid separation is realized.
3. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the roll shaft of the spreading cloth roll (3) is provided with spiral blades, the roll shaft of the feeding thickness regulating roll (4) is provided with plate-shaped blades, and the surfaces of the pressurizing belt damping roll (7), the net stacking damping roll (22) and the damping counter-pressure roll (24) are wrapped with high friction layers.
4. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the negative pressure damping box (6) is further arranged below the filter pressing mesh belt (2) between the grooved filter pressing roller (51) and the pressurizing belt damping roller (7), the surface of the negative pressure damping box (6) in contact with the filter pressing mesh belt (2) is a wear-resistant panel provided with grooves, and the negative pressure damping box (6) can adjust the suction vacuum degree to adjust the tension of the filter pressing mesh belt (2).
5. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the roller surface of the grooved press roller (51) is provided with annular grooves.
6. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the tension of the filter pressing net belt (2) is 5-15 newtons/millimeter.
7. A belt filter press of the type with stepwise tension adjustment according to claim 1, wherein: the tension of the pressurizing belt (18) is 15-105N/mm, and the dimension deformation of the pressurizing belt (18) in the longitudinal direction and the transverse direction is not more than 3% under the condition of 100N/mm tension of the pressurizing belt (18).
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| CN201710657645.6A CN107376463B (en) | 2017-08-03 | 2017-08-03 | Belt filter press capable of adjusting tension in segmented mode |
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| CN201710657645.6A CN107376463B (en) | 2017-08-03 | 2017-08-03 | Belt filter press capable of adjusting tension in segmented mode |
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| CN107376463B true CN107376463B (en) | 2023-07-04 |
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| CN109011817A (en) * | 2018-07-27 | 2018-12-18 | 朱忆人 | It is a kind of can lamination absorption solid-liquid separating equipment |
| CN110215755A (en) * | 2019-05-15 | 2019-09-10 | 湖州核工惠能环保过滤科技有限公司 | A kind of vacuum change chamber belt filter press |
| CN110117147A (en) * | 2019-06-20 | 2019-08-13 | 成都颂源环保科技有限公司 | A kind of continuous deep dehydration equipment |
| CN110777501B (en) * | 2019-11-13 | 2024-04-02 | 上海东龙服饰有限公司 | Cloth belt tension adjusting and water absorbing device of air ironing machine |
| CN111041882B (en) * | 2019-12-12 | 2021-10-19 | 郑州宇恒环保技术有限公司 | Paper-making meshes belt cleaning device |
| CN111732318B (en) * | 2020-07-24 | 2021-01-08 | 山东创新华一环境工程有限公司 | Solid-liquid separation extruder |
| CN112917974A (en) * | 2021-02-02 | 2021-06-08 | 淮阴工学院 | Strong dewatering machine |
| CN113750615B (en) * | 2021-08-26 | 2022-09-16 | 中煤（北京）环保工程有限公司 | Vacuum drying type filter press tool and filter pressing method thereof |
| CN115231796B (en) * | 2022-09-02 | 2024-08-27 | 青岛核盛智能环保设备有限公司 | Sludge dewatering machine |
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